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WO2008110548A2 - Crude gas cooling system for a fuel supply plant - Google Patents

Crude gas cooling system for a fuel supply plant Download PDF

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Publication number
WO2008110548A2
WO2008110548A2 PCT/EP2008/052856 EP2008052856W WO2008110548A2 WO 2008110548 A2 WO2008110548 A2 WO 2008110548A2 EP 2008052856 W EP2008052856 W EP 2008052856W WO 2008110548 A2 WO2008110548 A2 WO 2008110548A2
Authority
WO
WIPO (PCT)
Prior art keywords
steam
gas
steam generator
heat exchanger
raw gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2008/052856
Other languages
German (de)
French (fr)
Other versions
WO2008110548A3 (en
Inventor
Carsten Graeber
Werner GÜNSTER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO2008110548A2 publication Critical patent/WO2008110548A2/en
Publication of WO2008110548A3 publication Critical patent/WO2008110548A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/86—Other features combined with waste-heat boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/067—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion heat coming from a gasification or pyrolysis process, e.g. coal gasification
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1671—Integration of gasification processes with another plant or parts within the plant with the production of electricity
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1671—Integration of gasification processes with another plant or parts within the plant with the production of electricity
    • C10J2300/1675—Integration of gasification processes with another plant or parts within the plant with the production of electricity making use of a steam turbine
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1687—Integration of gasification processes with another plant or parts within the plant with steam generation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1861—Heat exchange between at least two process streams
    • C10J2300/1884—Heat exchange between at least two process streams with one stream being synthesis gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1861—Heat exchange between at least two process streams
    • C10J2300/1892—Heat exchange between at least two process streams with one stream being water/steam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]

Definitions

  • the invention relates to a raw gas cooling system for a fuel supply system, with the raw gas as a product of gasification of a fuel can be generated, the fuel gasification plant for a gas and steam power plant and the gas and steam power plant with the fuel gasification plant.
  • a gas and steam power plant has a gas turbine and a steam turbine.
  • the gas turbine is fired, for example, with a fossil fuel, wherein waste heat is generated during its combustion.
  • the waste heat is used in a steam generator to generate live steam, with which the steam turbine is driven.
  • the fossil fuel with which the gas and steam power plant is operated is, for example, coal, biomass, refinery residues or waste.
  • the gas and steam power plant has an integrated coal gasification plant, with which the coal is gasified.
  • the gasification plant operates, for example, according to the entrained flow, fluidized bed or fixed bed principle, wherein in the trajectory principle, the coal is gasified by partial oxidation at, for example, 1400 0 C to a crude gas.
  • the crude gas has in particular a high concentration of sulfur compounds, heavy metals, dust, hydrogen and carbon monoxide.
  • a crude gas purification plant which has, for example, a gas scrubber or a filter unit and / or a laundry.
  • the raw gas Before the raw gas enters the crude gas purification plant, the raw gas must be cooled in a crude gas precooling facility. Conventionally, this water and / or gas is sprayed into the crude gas, wherein the water evaporates, for example, and thereby cools the crude gas.
  • a gasification process with a water quench as Rohgasvorkühlungs Rosaceas, a water quench as Rohgasvorkühlungs founded is here in The hot raw gas sprayed water, which evaporates and thereby cools the raw gas.
  • so much water is sprayed into the crude gas until the crude gas is saturated with water vapor, so that the raw gas is cooled to about 200 0 C.
  • Raw gas for example, fed to a process step for converting the carbon monoxide contained in the raw gas.
  • this process step based on the homogeneous water gas shift reaction (CO + H 2 O -> CO 2 + H 2 ), the high proportion of carbon monoxide in the raw gas with water vapor in carbon dioxide and
  • a carbon dioxide separation device is provided in the coal gasification plant, for example a gas scrubber with which the carbon dioxide is eliminated from the raw gas.
  • a gas scrubber with which the carbon dioxide is eliminated from the raw gas.
  • the raw gas Prior to the entry of the raw gas into the carbon dioxide separation device, the raw gas, depending on the process principle in the first step (without refrigerant) usually below
  • the raw gas cooling system 100 has a crude gas line 101 in which a steam generator 102 and a cooler 105 are connected in series.
  • the raw gas cooling system 100 is between a
  • the steam generator 102 has a feed water supply line 103 in which feed water is supplied to the steam generator 102, and a steam line 104 in which steam from the steam generator 102
  • Steam generator 102 is discharged.
  • the raw gas is passed through the crude gas line 101 and flows through the steam generator 102, so that from the feed water through the feedwater serzu réelletechnisch 103 is guided to the steam generator 102, the steam is generated, which is discharged through the steam line 104 from the steam generator 102 and fed to a process of the gas and steam power plant.
  • the cooler 105 flows through the raw gas and has a cooler bundle 106 through which the cooling water is passed, which is heated by the raw gas.
  • the raw gas at the inlet 107 of the raw gas cooling system 100 has a high proportion of water vapor (about 34 vol.%), In which heat is latently bound at low temperature. Conventionally, this low-temperature heat is used only insufficiently thermally in the conventional gas and steam power plant.
  • the object of the invention is to provide a raw gas cooling system for a fuel gasification plant, with the raw gas as the product of a gasification of a fuel produced, the fuel gasification plant for a gas and steam power plant and the gas and steam power plant, the gas and steam power plant a has high thermal efficiency.
  • the raw gas cooling system according to the invention for a fuel gasification plant with which crude gas can be produced as the product of a gasification of a fuel has a first steam generator, a second steam generator and a first heat exchanger stage, which are successively flowed through in series or in parallel by the raw gas, wherein the second steam generator is arranged downstream of the first steam generator and is arranged to generate steam whose pressure level is lower than that of the steam producible with the first steam generator and the first heat exchanger stage is arranged downstream of the second steam generator and arranged, a process liquid in a process fluid circuit to warm up.
  • the fuel gasification plant according to the invention for a gas and steam power plant, with which the raw gas is used as product of a Gasification of a fuel can be generated, has the raw gas cooling system.
  • gas and steam power plant the fuel gasification plant with all subsystems / process steps.
  • Process liquid can be fed to the gas and steam power plant and used in this energetically.
  • the gas and steam power plant has a high thermal efficiency.
  • the gas and steam power plant preferably has the process fluid circuit as an intermediate circuit, which is set up for heat transport to a system component of the gas and steam power plant.
  • the system component is preferably a pure gas saturation and / or a turbine nozzle reheating and / or a supplementary water pre-degassing.
  • the gas and steam power plant generate electricity and / or a process steam supply and / or a further processing of the generated synthesis gas to e.g. Methanol, hydrogen, to which the steam generated by the first steam generator can be fed.
  • the generated synthesis gas e.g. Methanol, hydrogen
  • the gas and steam power plant has a power generation and / or a process steam supply and / or a fuel drying and / or a further processing of the generated synthesis gas to chemical raw materials, to which the steam generated by the second steam generator can be fed.
  • the heat supplied by the first heat exchanger stage to the process liquid and / or the steam generated in the first steam generator and / or the steam generated in the second steam generator are in the gas and steam power plant and / or in the fuel gasification plant (including fuel drying system) and / or used in the crude gas purification / carbon dioxide separation, so that the gas and steam power plant in conjunction with the fuel gasification plant and the downstream process steps has a high thermal efficiency ,
  • the raw gas cooling system preferably has a second heat exchanger stage, which is arranged upstream of the second steam generator, so that the raw gas can be conducted successively through the first steam generator, the second heat exchanger stage, the second steam generator and the first heat exchanger stage and the process liquid from the first heat exchanger stage to the first second heat exchanger stage is conductive.
  • the raw gas cooling system preferably has a second heat exchanger stage which is arranged parallel to the second steam generator so that the raw gas can be conducted from the first steam generator, in parallel through the second heat exchanger stage and the second steam generator and finally through the first heat exchanger stage and the process liquid from the first heat exchanger stage to the second heat exchanger stage is conductive.
  • the temperature of the process liquid at the outlet of the second heat exchanger stage is high.
  • the process fluid is supplied to the gas and steam power plant with the process fluid circuit and is thermally recycled, so that the gas and steam power plant and thus also the entire plant has a high thermal efficiency.
  • the steam generated in the second evaporator is saturated steam, which can also be provided to increase the thermal efficiency of the entire system available.
  • the saturated steam of the fuel preparation can be For example, be supplied as heating steam for fuel drying, gasification, gas treatment or steam turbine for energy use.
  • the steam generated by the second steam generator substitutes the otherwise required higher-value low-pressure steam, so that more high-quality low-pressure steam is available for power generation in a steam turbine set of the gas and steam power plant to the same extent.
  • the resulting increase in the thermal efficiency of the entire plant gas and steam power plant in conjunction with the fuel gasification plant and the upstream and downstream process steps) can be around 1%.
  • the raw gas cooling system has a cooler which is arranged downstream of the first heat exchanger stage, so that the raw gas can be conducted successively through the first heat exchanger stage and the cooler.
  • the raw gas is preferably further cooled, it being possible with the cooler for the heat removed from the raw gas to be supplied to the process of the gas and steam power plant or, alternatively, removed via a cooling system.
  • FIG. 1 shows a schematic representation of a first embodiment of the raw gas cooling system according to the invention
  • FIG. 2 shows a schematic representation of a second embodiment of the raw gas cooling system according to the invention
  • FIG. 3 shows a schematic illustration of a third embodiment of the raw gas cooling system according to the invention
  • FIG. 4 shows a conventional raw gas cooling system.
  • a raw gas cooling system 1 has a crude gas line 2, in which raw gas is passed from a raw gas pre-cooling device 3 to a crude gas purification plant 21.
  • the raw gas cooling system 1 in the crude gas line 2, a first steam generator 4, a second steam generator 8, a first heat exchanger stage 12 and a radiator 18.
  • the first steam generator 4, the second steam generator 8, the first heat exchanger stage 12 and the radiator 18 are connected in series and are flowed through by the raw gas in this order.
  • the crude gas of about 200 0 C at the Rohgasvorkühlungs Surprise 3 is gradually cooled to about 40 0 C at the crude gas purification plant 21.
  • the first steam generator 4 has a first feed water supply line 5 through which feed water is led to the first steam generator 4. By flowing the raw gas through the first steam generator 4, the feed water supplied to the first steam generator 4 is heated to a first steam which is discharged through a first steam line 6 of the first steam generator 4.
  • the first steam line 6 leads the first steam to a power generation and / or a process steam generation and / or a further processing plant of the generated synthesis gas 7.
  • the second steam generator 8 has a second feedwater supply line 9 and a second steam line 10.
  • the second steam generator 8 is flowed through by the raw gas, whereby the fed through the second feedwater supply 9 to the second steam generator 8 feed water is heated to a second steam, which is discharged via the second steam line 10 from the second steam generator 8.
  • the second steam line 10 leads to a fuel drying and / or power generation and / or a process steam supply and / or a further processing plant of the generated synthesis gas 11.
  • the second vapor is lower in its pressure level than the first steam.
  • the raw gas cooling system 1 has a first heat exchanger stage, to which process liquid is supplied by a process liquid supply line 15 and from which the process liquid is discharged through a process liquid discharge line 16.
  • the process fluid supply line 15 and the process fluid discharge line 16 are connected to a process fluid circuit 14 in such a way that the process fluid is conducted in such a way that the process fluid is circulated through the first heat exchanger stage 12 and the process fluid circuit 14.
  • the process fluid circuit 14 includes a clean gas saturation and / or turbine condensate warming and / or a supplementary water pre-degassing as heat-supplying system components.
  • the radiator 18 has a radiator pack 19, is passed through the cooling water. Further, a gas condensate discharge line 20 is provided on the radiator. Cooling water that is passed through the radiator pack 19 cools the raw gas flowing through the radiator 18, and condensate precipitated in the cooled raw gas is discharged from the radiator 18 via the gas condensate outflow line 20.
  • the embodiment of the raw gas cooling system 1 shown in FIG. 2 differs from the embodiment of the raw gas cooling system 1 shown in FIG. 1 in that, according to the embodiment shown in FIG. 2, the raw gas cooling system 1 has a second heat exchanger stage 13, which is connected to an intermediate line 17 in a process fluid-conducting manner.
  • the second heat exchanger stage 13 is integrated in the raw gas cooling system 1 such that in the process fluid circuit 14 the process fluid from the process fluid supply line 15 to the first heat exchanger stage 12 and finally flows via the process liquid discharge line 16 to the process liquid circuit 14.
  • the first steam generator 4, the second heat exchanger stage 13, the second steam generator 8, the first heat exchanger stage 12, and the radiator 18 are arranged in series in the raw gas line 2 and flowed through by the raw gas in this order.
  • the embodiment of the raw gas cooling system 1 shown in FIG. 3 differs from the embodiment of the raw gas cooling system 1 shown in FIG. 2 in that the second heat exchanger stage 13 and the second steam generator 8 are not connected in series but in parallel with one another.
  • the raw gas cooling system 1 according to FIG. 3 downstream of the first steam generator 4 has a first crude gas line section 22, from which a second crude gas line section 23 branches off. After this branching of the second crude gas line section 23, the second heat exchanger section 13 is provided in the first crude gas line section 22, the second steam generator 8 being provided in the second raw gas line section 23.
  • the Rohgasksselsystems 1 the raw gas flows in the direction shown in Figure 3 embodiment of the Rohgasvorksselungs- device 3 with a temperature of 205 0 C to the first steam generator 4.
  • the first steam generator 4 is from the feedwater that the by the first feed water 5 first steam generator 4 is supplied, the first generated steam, which is discharged with the first steam line 6 from the first steam generator 4 and has a pressure of about 6.7 bar.
  • the first steam is suitable to be supplied to the power generation and / or the process steam supply 7.
  • the raw gas at a temperature of 174 ° C and the second steam generator 8 via the second tube gas section 23 and the second choir (2004)tu- fe 13 via the first pipe gas line section 22 is supplied.
  • the second steam generator 8 the second steam, which is discharged with the second steam line 10 and has approximately 4 bar, is generated by the feed water supplied through the second feed water feed line 9.
  • the second steam is suitable to be supplied to the fuel drying and / or the power generation and / or the process steam generation 11.
  • the raw gas leaves the second heat exchanger stage 13 at a temperature of 158 0 C via the fourth Rohgas effetsab- section 25 and mixed with the raw gas from the third Rohgas effetsabites 24 to a crude gas mixture with a mixing temperature of 163 0 C.
  • This crude gas mixture flows through the first Heat exchanger stage 12, wherein the raw gas leaves the first heat exchanger stage 12 at 129 0 C.
  • the crude gas mixture has a temperature of 40 0 C and is adapted to be fed to the raw gas cleaning 21st
  • the Jerusalem-sander is fed in the Jerusalem-sandertechnisch 15 having a temperature of 66 0 C of the first heat exchanger stage 12th
  • the process liquid exits from the first heat exchanger stage 12 via the intermediate line 17 and flows through the second heat exchanger stage 13.
  • the process liquid has a temperature of 150 ° C. and is returned to the process fluid circuit 14.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

A crude gas cooling system (1) for a fuel gasification plant by means of which crude gas can be produced as the product of gasification of a fuel comprises a first steam generator (4), a second steam generator (8) and a first heat exchange unit (12) which are connected in series or in parallel and through which the crude gas can flow one after the other. The second steam generator (8) is arranged downstream of the first steam generator (4) and is adapted to generate steam the pressure level of which is lower than the steam that can be generated by the first steam generator (4). The first heat exchange unit (12) is arranged downstream of the second steam generator and is adapted to heat a process fluid in a process fluid circuit (14). A fuel gasification plant for a combined cycle power plant by means of which crude gas can be produced as the product of gasification comprises a crude gas cooling system (1). The combined cycle power plant comprises the fuel supply plant according to the invention.

Description

Beschreibungdescription

Rohgaskühlsystem für eine BrennstoffversorgungsanlageRaw gas cooling system for a fuel supply system

Die Erfindung betrifft ein Rohgaskühlsystem für eine Brenn- stoffversorgungsanlage, mit der Rohgas als Produkt einer Vergasung eines Brennstoffes erzeugbar ist, die Brennstoffvergasungsanlage für ein Gas- und Dampfkraftwerk und das Gas- und Dampfkraftwerk mit der Brennstoffvergasungsanlage .The invention relates to a raw gas cooling system for a fuel supply system, with the raw gas as a product of gasification of a fuel can be generated, the fuel gasification plant for a gas and steam power plant and the gas and steam power plant with the fuel gasification plant.

Ein Gas- und Dampfkraftwerk weist eine Gasturbine und eine Dampfturbine auf. Die Gasturbine wird beispielsweise mit einem fossilen Brennstoff befeuert, wobei bei dessen Verbrennung Abwärme erzeugt wird. Die Abwärme wird in einem Dampfer- zeuger zur Erzeugung von Frischdampf benutzt, mit dem die Dampfturbine angetrieben wird.A gas and steam power plant has a gas turbine and a steam turbine. The gas turbine is fired, for example, with a fossil fuel, wherein waste heat is generated during its combustion. The waste heat is used in a steam generator to generate live steam, with which the steam turbine is driven.

Der fossile Brennstoff, mit dem das Gas- und Dampfkraftwerk betrieben wird, sind beispielsweise Kohlen, Biomassen, Raffi- nerierückstände oder Abfälle. Dafür weist das Gas- und Dampfkraftwerk eine integrierte Kohlevergasungsanlage auf, mit der die Kohle vergast wird. Die Vergasungsanlage arbeitet beispielsweise nach dem Flugstrom-, Wirbelbett- oder dem Festbettprinzip, wobei bei dem Flugstromprinzip die Kohle durch partielle Oxidation bei beispielsweise 1400 0C zu einem Rohgas vergast wird. Am Austritt der Kohlevergasungsanlage weist das Rohgas insbesondere eine hohe Konzentration an Schwefelverbindungen, Schwermetallen, Staub, Wasserstoff und Kohlen- monoxid auf. Zur Elimination der Schwefelverbindungen, der Schwermetalle und des Staubes aus dem Rohgas ist eine Rohgasreinigungsanlage vorgesehen, die beispielsweise eine Gaswäsche oder eine Filtereinheit und/oder eine Wäsche aufweist. Vor dem Eintritt des Rohgases in die Rohgasreinigungsanlage ist das Rohgas in einer Rohgasvorkühlungseinrichtung zu küh- len. Herkömmlich wird hierbei Wasser und/oder Gas in das Rohgas eingesprüht, wobei das Wasser z.B. verdampft und dadurch das Rohgas kühlt. Bei einem Vergasungsverfahren mit einem Wasserquench als Rohgasvorkühlungseinrichtung wird hierbei in das heiße Rohgas Wasser eingesprüht, das verdampft und dadurch das Rohgas kühlt. In der Regel wird so viel Wasser in das Rohgas eingesprüht, bis das Rohgas mit Wasserdampf gesättigt ist, so dass das Rohgas auf ca. 200 0C abgekühlt wird. Nach der ersten Stufe der Rohgasreinigungsanlage wird dasThe fossil fuel with which the gas and steam power plant is operated is, for example, coal, biomass, refinery residues or waste. For this, the gas and steam power plant has an integrated coal gasification plant, with which the coal is gasified. The gasification plant operates, for example, according to the entrained flow, fluidized bed or fixed bed principle, wherein in the trajectory principle, the coal is gasified by partial oxidation at, for example, 1400 0 C to a crude gas. At the exit of the coal gasification plant, the crude gas has in particular a high concentration of sulfur compounds, heavy metals, dust, hydrogen and carbon monoxide. For the elimination of the sulfur compounds, the heavy metals and the dust from the raw gas, a crude gas purification plant is provided which has, for example, a gas scrubber or a filter unit and / or a laundry. Before the raw gas enters the crude gas purification plant, the raw gas must be cooled in a crude gas precooling facility. Conventionally, this water and / or gas is sprayed into the crude gas, wherein the water evaporates, for example, and thereby cools the crude gas. In a gasification process with a water quench as Rohgasvorkühlungseinrichtung is here in The hot raw gas sprayed water, which evaporates and thereby cools the raw gas. As a rule, so much water is sprayed into the crude gas until the crude gas is saturated with water vapor, so that the raw gas is cooled to about 200 0 C. After the first stage of the crude gas purification plant is the

Rohgas beispielsweise einem Prozessschritt zur Umwandlung des im Rohgas enthaltenen Kohlenmonoxids zugeführt. In diesem Prozessschritt wird auf Grundlage der homogenen Wassergas- Shift-Reaktion (CO + H2O -> CO2 + H2) der hohe Anteil des Koh- lenmonoxids im Rohgas mit Wasserdampf in Kohlendioxid undRaw gas, for example, fed to a process step for converting the carbon monoxide contained in the raw gas. In this process step, based on the homogeneous water gas shift reaction (CO + H 2 O -> CO 2 + H 2 ), the high proportion of carbon monoxide in the raw gas with water vapor in carbon dioxide and

Wasserstoff umgewandelt. Da es sich hierbei um eine Gleichgewichtsreaktion handelt, erfolgt dieser Prozessschritt beispielsweise katalytisch in einen oder mehreren Shift- Reaktoren .Converted hydrogen. Since this is an equilibrium reaction, this process step is carried out, for example, catalytically in one or more shift reactors.

Ferner ist in der Kohlevergasungsanlage eine Kohlendioxidab- scheidungseinrichtung vorgesehen, beispielsweise eine Gaswäsche, mit der das Kohlendioxid aus dem Rohgas eliminiert wird. Somit hat das Gas- und Dampfkraftwerk je nach Abschei- dungsgrad geringe bis gar keine Kohlendioxidemissionen, so dass das Gas- und Dampfkraftwerk umweltschonend ist.Furthermore, a carbon dioxide separation device is provided in the coal gasification plant, for example a gas scrubber with which the carbon dioxide is eliminated from the raw gas. Thus, depending on the degree of separation, the gas and steam power plant has little to no carbon dioxide emissions, so that the gas and steam power plant is environmentally friendly.

Vor dem Eintritt des Rohgases in die Kohlendioxidabschei- dungseinrichtung ist das Rohgas je nach Verfahrensprinzip im ersten Schritt (ohne Kältemittel) üblicherweise auf unterPrior to the entry of the raw gas into the carbon dioxide separation device, the raw gas, depending on the process principle in the first step (without refrigerant) usually below

400C abzukühlen. Herkömmlich wird dies mit einem Rohgaskühlsystem 100 bewerkstelligt, wie es in Figur 4 gezeigt ist. Das Rohgaskühlsystem 100 weist eine Rohgasleitung 101 auf, in der hintereinander ein Dampferzeuger 102 und ein Kühler 105 ge- schaltet sind. Das Rohgaskühlsystem 100 ist zwischen einer40 0 C to cool. Conventionally, this is done with a raw gas cooling system 100, as shown in FIG. The raw gas cooling system 100 has a crude gas line 101 in which a steam generator 102 and a cooler 105 are connected in series. The raw gas cooling system 100 is between a

Rohgasvorkühlungseinrichtung 107 und einer Rohgasreinigungs- anlage/Kohlendioxidabscheidungseinrichtung 108 vorgesehen. Der Dampferzeuger 102 weist eine Speisewasserzuführleitung 103, in der Speisewasser zu dem Dampferzeuger 102 geführt wird, und eine Dampfleitung 104 auf, in der Dampf von demRohgasvorkühlungseinrichtung 107 and a Rohgasreinigungs- / carbon dioxide separation 108 provided. The steam generator 102 has a feed water supply line 103 in which feed water is supplied to the steam generator 102, and a steam line 104 in which steam from the steam generator 102

Dampferzeuger 102 abgeführt wird. Das Rohgas wird durch die Rohgasleitung 101 geführt und durchströmt den Dampferzeuger 102, so dass aus dem Speisewasser, das durch die Speisewas- serzuführleitung 103 zu dem Dampferzeuger 102 geführt wird, der Dampf erzeugt wird, der durch die Dampfleitung 104 vom Dampferzeuger 102 abgeführt und einem Prozess des Gas- und Dampfkraftwerks zugeführt wird. Ferner wird der Kühler 105 von dem Rohgas durchströmt und weist ein Kühlerbündel 106 auf, das vom Kühlwasser durchströmt wird, das von dem Rohgas erwärmt wird.Steam generator 102 is discharged. The raw gas is passed through the crude gas line 101 and flows through the steam generator 102, so that from the feed water through the feedwater serzuführleitung 103 is guided to the steam generator 102, the steam is generated, which is discharged through the steam line 104 from the steam generator 102 and fed to a process of the gas and steam power plant. Further, the cooler 105 flows through the raw gas and has a cooler bundle 106 through which the cooling water is passed, which is heated by the raw gas.

Das Rohgas am Eintritt 107 des Rohgaskühlsystems 100 weist einen hohen Anteil an Wasserdampf (ca. 34 Vol. %) auf, in dem Wärme latent bei niedriger Temperatur gebunden ist. Herkömmlich wird diese Niedertemperaturwärme in dem herkömmlichen Gas- und Dampfkraftwerk nur unzureichend thermisch genutzt.The raw gas at the inlet 107 of the raw gas cooling system 100 has a high proportion of water vapor (about 34 vol.%), In which heat is latently bound at low temperature. Conventionally, this low-temperature heat is used only insufficiently thermally in the conventional gas and steam power plant.

Aufgabe der Erfindung ist es, ein Rohgaskühlsystem für eine Brennstoffvergasungsanlage, mit der Rohgas als Produkt einer Vergasung eines Brennstoffes erzeugbar ist, die Brennstoffvergasungsanlage für ein Gas- und Dampfkraftwerk und das Gas- und Dampfkraftwerk zu schaffen, wobei das Gas- und Dampf- kraftwerk einen hohen thermischen Wirkungsgrad hat.The object of the invention is to provide a raw gas cooling system for a fuel gasification plant, with the raw gas as the product of a gasification of a fuel produced, the fuel gasification plant for a gas and steam power plant and the gas and steam power plant, the gas and steam power plant a has high thermal efficiency.

Das erfindungsgemäße Rohgaskühlsystem für eine Brennstoffvergasungsanlage, mit der Rohgas als Produkt einer Vergasung eines Brennstoffes erzeugbar ist, weist einen ersten Dampfer- zeuger, einen zweiten Dampferzeuger und eine erste Wärmetauscherstufe auf, die in Reihe oder parallel geschaltet von dem Rohgas nacheinander durchströmbar sind, wobei der zweite Dampferzeuger stromab des ersten Dampferzeugers angeordnet ist und eingerichtet ist, Dampf zu erzeugen, dessen Druckni- veau niedriger ist, als das des mit dem ersten Dampferzeuger erzeugbaren Dampfes und die erste Wärmetauscherstufe stromab des zweiten Dampferzeugers angeordnet und eingerichtet ist, eine Prozessflüssigkeit in einem Prozessflüssigkeitskreislauf zu erwärmen.The raw gas cooling system according to the invention for a fuel gasification plant with which crude gas can be produced as the product of a gasification of a fuel, has a first steam generator, a second steam generator and a first heat exchanger stage, which are successively flowed through in series or in parallel by the raw gas, wherein the second steam generator is arranged downstream of the first steam generator and is arranged to generate steam whose pressure level is lower than that of the steam producible with the first steam generator and the first heat exchanger stage is arranged downstream of the second steam generator and arranged, a process liquid in a process fluid circuit to warm up.

Die erfindungsgemäße Brennstoffvergasungsanlage für ein Gas- und Dampfkraftwerk, mit der das Rohgas als Produkt einer Ver- gasung eines Brennstoffes erzeugbar ist, weist das Rohgaskühlsystem auf.The fuel gasification plant according to the invention for a gas and steam power plant, with which the raw gas is used as product of a Gasification of a fuel can be generated, has the raw gas cooling system.

Ferner weist das erfindungsgemäße Gas- und Dampfkraftwerk die Brennstoffvergasungsanlage mit allen Teilanlagen/Prozessschritten auf.Furthermore, the gas and steam power plant according to the invention the fuel gasification plant with all subsystems / process steps.

Der Dampf, der mit dem ersten Dampferzeuger erzeugbar ist, und der Dampf, der mit dem zweiten Dampferzeuger erzeugbar ist, sowie die von der ersten Wärmetauscherstufe erwärmteThe steam that is producible with the first steam generator and the steam that can be generated with the second steam generator and that heated by the first heat exchanger stage

Prozessflüssigkeit sind dem Gas- und Dampfkraftwerk zuführbar und in diesem energetisch verwertbar. Dadurch hat das Gas- und Dampfkraftwerk einen hohen thermischen Wirkungsgrad.Process liquid can be fed to the gas and steam power plant and used in this energetically. As a result, the gas and steam power plant has a high thermal efficiency.

Bevorzugt weist das Gas- und Dampfkraftwerk den Prozessflüs- sigkeitskreislauf als einen Zwischenkreislauf auf, der zum Wärmetransport zu einer Anlagenkomponente des Gas- und Dampfkraftwerks eingerichtet ist. Bevorzugt ist die Anlagenkomponente eine ReingasaufSättigung und/oder eine Turbinenkonden- sataufwärmung und/oder eine Zusatzwasservorentgasung.The gas and steam power plant preferably has the process fluid circuit as an intermediate circuit, which is set up for heat transport to a system component of the gas and steam power plant. The system component is preferably a pure gas saturation and / or a turbine nozzle reheating and / or a supplementary water pre-degassing.

Ferner ist es bevorzugt, dass das Gas- und Dampfkraftwerk eine Stromerzeugung und/oder eine Prozessdampfversorgung und/oder eine Weiterverarbeitung des generierten Synthesega- ses zu z.B. Methanol, Wasserstoff aufweist, zu denen der von dem ersten Dampferzeuger erzeugte Dampf zuführbar ist.Furthermore, it is preferred that the gas and steam power plant generate electricity and / or a process steam supply and / or a further processing of the generated synthesis gas to e.g. Methanol, hydrogen, to which the steam generated by the first steam generator can be fed.

Außerdem ist es bevorzugt, dass das Gas- und Dampfkraftwerk eine Stromerzeugung und/oder eine Prozessdampfversorgung und/oder eine Brennstofftrocknung und/oder eine Weiterverarbeitung des generierten Synthesegases zu Chemierohstoffen aufweist, zu denen der von dem zweiten Dampferzeuger erzeugte Dampf zuführbar ist.Moreover, it is preferred that the gas and steam power plant has a power generation and / or a process steam supply and / or a fuel drying and / or a further processing of the generated synthesis gas to chemical raw materials, to which the steam generated by the second steam generator can be fed.

Dadurch wird vorteilhaft erreicht, dass die von der ersten Wärmetauscherstufe der Prozessflüssigkeit zugeführte Wärme und/oder der in dem ersten Dampferzeuger erzeugte Dampf und/oder der in dem zweiten Dampferzeuger erzeugte Dampf in dem Gas- und Dampfkraftwerk und/oder in der Brennstoffvergasungsanlage (inklusive Brennstofftrocknungssystem) und/oder in der Rohgasreinigungsanlage / Kohlendioxidabscheidungsein- richtung energetisch verwertet wird, so dass das Gas- und Dampfkraftwerk in Verbindung mit der Brennstoffvergasungsanlage und den nachgeschalteten Prozessschritten einen hohen thermischen Wirkungsgrad hat.As a result, it is advantageously achieved that the heat supplied by the first heat exchanger stage to the process liquid and / or the steam generated in the first steam generator and / or the steam generated in the second steam generator are in the gas and steam power plant and / or in the fuel gasification plant (including fuel drying system) and / or used in the crude gas purification / carbon dioxide separation, so that the gas and steam power plant in conjunction with the fuel gasification plant and the downstream process steps has a high thermal efficiency ,

Bevorzugt weist das Rohgaskühlsystem eine zweite Wärmetau- scherstufe auf, die stromauf des zweiten Dampferzeugers angeordnet ist, so dass das Rohgas nacheinander durch den ersten Dampferzeuger, die zweite Wärmetauscherstufe, den zweiten Dampferzeuger und die erste Wärmetauscherstufe leitbar und die Prozessflüssigkeit von der ersten Wärmetauscherstufe zu der zweiten Wärmetauscherstufe leitbar ist.The raw gas cooling system preferably has a second heat exchanger stage, which is arranged upstream of the second steam generator, so that the raw gas can be conducted successively through the first steam generator, the second heat exchanger stage, the second steam generator and the first heat exchanger stage and the process liquid from the first heat exchanger stage to the first second heat exchanger stage is conductive.

Alternativ dazu weist bevorzugt das Rohgaskühlsystem eine zweite Wärmetauscherstufe auf, die parallel zu dem zweiten Dampferzeuger angeordnet ist, so dass das Rohgas von dem ers- ten Dampferzeuger, parallel durch die zweite Wärmetauscherstufe und dem zweiten Dampferzeuger und schließlich durch die erste Wärmetauscherstufe leitbar und die Prozessflüssigkeit von der ersten Wärmetauscherstufe zu der zweiten Wärmetauscherstufe leitbar ist.Alternatively, the raw gas cooling system preferably has a second heat exchanger stage which is arranged parallel to the second steam generator so that the raw gas can be conducted from the first steam generator, in parallel through the second heat exchanger stage and the second steam generator and finally through the first heat exchanger stage and the process liquid from the first heat exchanger stage to the second heat exchanger stage is conductive.

Dadurch, dass die erste Wärmetauscherstufe und die zweite Wärmetauscherstufe vorgesehen sind, ist die Temperatur der Prozessflüssigkeit am Austritt der zweiten Wärmetauscherstufe hoch. Die Prozessflüssigkeit wird mit dem Prozessflüssig- keitskreislauf dem Gas- und Dampfkraftwerk zugeführt und thermisch verwertet, so dass das Gas- und Dampfkraftwerk und damit auch die Gesamtanlage einen hohen thermischen Wirkungsgrad hat .Characterized in that the first heat exchanger stage and the second heat exchanger stage are provided, the temperature of the process liquid at the outlet of the second heat exchanger stage is high. The process fluid is supplied to the gas and steam power plant with the process fluid circuit and is thermally recycled, so that the gas and steam power plant and thus also the entire plant has a high thermal efficiency.

Ferner ist der in dem zweiten Verdampfer erzeugte Dampf Sattdampf, der ebenfalls zur Steigerung des thermischen Wirkungsgrades der Gesamtanlage zur Verfügung gestellt werden kann. Hierbei kann der Sattdampf der Brennstoffaufbereitung bei- spielsweise als Heizdampf für die Brennstofftrocknung, einer Vergasung, einer Gasbehandlung oder einer Dampfturbine zur energetischen Nutzung zugeführt werden. Der von dem zweiten Dampferzeuger erzeugte Dampf substituiert dabei den sonst er- forderlichen höherwertigen Niederdruckdampf, so dass im gleichen Maße mehr hochwertiger Niederdruckdampf für die Stromerzeugung in einem Dampfturbosatz des Gas- und Dampfkraftwerks zur Verfügung steht. Die dadurch erzielte Erhöhung des thermischen Wirkungsgrades der Gesamtanlage (Gas- und Dampfkraft- werk in Verbindung mit der Brennstoffvergasungsanlage und den vor- und nachgeschalteten Prozessschritten) kann bei 1% liegen .Furthermore, the steam generated in the second evaporator is saturated steam, which can also be provided to increase the thermal efficiency of the entire system available. Hereby, the saturated steam of the fuel preparation can be For example, be supplied as heating steam for fuel drying, gasification, gas treatment or steam turbine for energy use. The steam generated by the second steam generator substitutes the otherwise required higher-value low-pressure steam, so that more high-quality low-pressure steam is available for power generation in a steam turbine set of the gas and steam power plant to the same extent. The resulting increase in the thermal efficiency of the entire plant (gas and steam power plant in conjunction with the fuel gasification plant and the upstream and downstream process steps) can be around 1%.

Ferner ist es bevorzugt, dass das Rohgaskühlsystem einen Küh- ler aufweist, der stromab der ersten Wärmetauscherstufe angeordnet ist, so dass das Rohgas nacheinander durch die erste Wärmetauscherstufe und den Kühler leitbar ist.Furthermore, it is preferred that the raw gas cooling system has a cooler which is arranged downstream of the first heat exchanger stage, so that the raw gas can be conducted successively through the first heat exchanger stage and the cooler.

Dadurch wird bevorzugt das Rohgas weiter abgekühlt, wobei mit dem Kühler die von dem Rohgas abgeführte Wärme dem Prozess des Gas- und Dampfkraftwerks zugeführt werden kann oder alternativ über ein Kühlsystem abgeführt wird.As a result, the raw gas is preferably further cooled, it being possible with the cooler for the heat removed from the raw gas to be supplied to the process of the gas and steam power plant or, alternatively, removed via a cooling system.

Im Folgenden werden bevorzugte Ausführungsformen eines erfin- dungsgemäßen Rohgaskühlsystems anhand der beigefügten schematischen Zeichnungen erläutert. Es zeigt:In the following, preferred embodiments of a raw gas cooling system according to the invention will be explained with reference to the attached schematic drawings. It shows:

Figur 1 eine schematische Darstellung einer ersten Ausführungsform des erfindungsgemäßen Rohgaskühlsystems,FIG. 1 shows a schematic representation of a first embodiment of the raw gas cooling system according to the invention,

Figur 2 eine schematische Darstellung einer zweiten Ausführungsform des erfindungsgemäßen Rohgaskühlsystems,FIG. 2 shows a schematic representation of a second embodiment of the raw gas cooling system according to the invention,

Figur 3 eine schematische Darstellung einer dritten Ausfüh- rungsform des erfindungsgemäßen Rohgaskühlsystems undFIG. 3 shows a schematic illustration of a third embodiment of the raw gas cooling system according to the invention and FIG

Figur 4 ein herkömmliches Rohgaskühlsystem. Wie es aus den Figuren 1 bis 3 ersichtlich ist, weist ein Rohgaskühlsystem 1 eine Rohgasleitung 2 auf, in der Rohgas von einer Rohgasvorkühlungseinrichtung 3 zu einer Rohgasreinigungsanlage 21 geleitet wird. Zur Kühlung des Rohgases von der Rohgasvorkühlungseinrichtung 3 zu der Rohgasreinigungsanlage 21 weist das Rohgaskühlsystem 1 in der Rohgasleitung 2 einen ersten Dampferzeuger 4, einen zweiten Dampferzeuger 8, eine erste Wärmetauscherstufe 12 und einen Kühler 18 auf. Der erste Dampferzeuger 4, der zweite Dampferzeuger 8, die erste Wärmetauscherstufe 12 und der Kühler 18 sind in Reihe geschaltet und werden in dieser Reihenfolge von dem Rohgas durchströmt .FIG. 4 shows a conventional raw gas cooling system. As can be seen from FIGS. 1 to 3, a raw gas cooling system 1 has a crude gas line 2, in which raw gas is passed from a raw gas pre-cooling device 3 to a crude gas purification plant 21. For cooling the raw gas from the Rohgasvorkühlungseinrichtung 3 to the Rohgasreinigungsanlage 21, the raw gas cooling system 1 in the crude gas line 2, a first steam generator 4, a second steam generator 8, a first heat exchanger stage 12 and a radiator 18. The first steam generator 4, the second steam generator 8, the first heat exchanger stage 12 and the radiator 18 are connected in series and are flowed through by the raw gas in this order.

Durch den ersten Dampferzeuger 4, den zweiten Dampferzeuger 8, die erste Wärmetauscherstufe 12 und den Kühler 18 wird das Rohgas von ca. 200 0C an der Rohgasvorkühlungseinrichtung 3 stufenweise auf ca. 40 0C an der Rohgasreinigungsanlage 21 abgekühlt .By the first steam generator 4, the second steam generator 8, the first heat exchanger stage 12 and the radiator 18, the crude gas of about 200 0 C at the Rohgasvorkühlungseinrichtung 3 is gradually cooled to about 40 0 C at the crude gas purification plant 21.

Der erste Dampferzeuger 4 weist eine erste Speisewasserzu- führleitung 5 auf, durch die Speisewasser zu dem ersten Dampferzeuger 4 geführt wird. Indem das Rohgas durch den ersten Dampferzeuger 4 strömt, wird das zu dem ersten Dampferzeuger 4 zugeführte Speisewasser zu einem ersten Dampf er- hitzt, der durch eine erste Dampfleitung 6 des ersten Dampferzeugers 4 abgeführt wird. Die erste Dampfleitung 6 führt den ersten Dampf zu einer Stromerzeugung und/oder einer Prozessdampferzeugung und/oder eine Weiterverarbeitungsanlage des erzeugten Synthesegases 7.The first steam generator 4 has a first feed water supply line 5 through which feed water is led to the first steam generator 4. By flowing the raw gas through the first steam generator 4, the feed water supplied to the first steam generator 4 is heated to a first steam which is discharged through a first steam line 6 of the first steam generator 4. The first steam line 6 leads the first steam to a power generation and / or a process steam generation and / or a further processing plant of the generated synthesis gas 7.

In gleicher Weise wie der erste Dampferzeuger 4 weist der zweite Dampferzeuger 8 eine zweite Speisewasserzuführleitung 9 und eine zweite Dampfleitung 10 auf. Der zweite Dampferzeuger 8 wird von dem Rohgas durchströmt, wodurch das durch die zweite Speisewasserzuführleitung 9 dem zweiten Dampferzeuger 8 zugeführte Speisewasser zu einem zweiten Dampf erhitzt wird, der über die zweite Dampfleitung 10 von dem zweiten Dampferzeuger 8 abgeführt wird. Die zweite Dampfleitung 10 führt zu einer Brennstofftrocknung und/oder einer Stromerzeugung und/oder einer Prozessdampfversorgung und/oder einer Weiterverarbeitungsanlage des erzeugten Synthesegases 11. Der zweite Dampf ist in seinem Druckniveau niedriger als der ers- te Dampf.In the same way as the first steam generator 4, the second steam generator 8 has a second feedwater supply line 9 and a second steam line 10. The second steam generator 8 is flowed through by the raw gas, whereby the fed through the second feedwater supply 9 to the second steam generator 8 feed water is heated to a second steam, which is discharged via the second steam line 10 from the second steam generator 8. The second steam line 10 leads to a fuel drying and / or power generation and / or a process steam supply and / or a further processing plant of the generated synthesis gas 11. The second vapor is lower in its pressure level than the first steam.

Ferner weist das Rohgaskühlsystem 1 eine erste Wärmetauscherstufe auf, zu der durch eine Prozessflüssigkeitszuführleitung 15 Prozessflüssigkeit zugeführt und von der durch eine Pro- zessflüssigkeitsabführleitung 16 die Prozessflüssigkeit abgeführt wird. Die Prozessflüssigkeitszuführleitung 15 und die Prozessflüssigkeitsabführleitung 16 sind mit einem Prozess- flüssigkeitskreislauf 14 derart prozessflüssigkeitsleitend verbunden, dass durch die erste Wärmetauscherstufe 12 und den Prozessflüssigkeitskreislauf 14 die Prozessflüssigkeit umgewälzt wird. Der Prozessflüssigkeitskreislauf 14 beinhaltet als wärmezuversorgende Anlagenkomponenten eine ReingasaufSättigung und/oder Turbinenkondensataufwärmung und/oder eine Zusatzwasservorentgasung.Furthermore, the raw gas cooling system 1 has a first heat exchanger stage, to which process liquid is supplied by a process liquid supply line 15 and from which the process liquid is discharged through a process liquid discharge line 16. The process fluid supply line 15 and the process fluid discharge line 16 are connected to a process fluid circuit 14 in such a way that the process fluid is conducted in such a way that the process fluid is circulated through the first heat exchanger stage 12 and the process fluid circuit 14. The process fluid circuit 14 includes a clean gas saturation and / or turbine condensate warming and / or a supplementary water pre-degassing as heat-supplying system components.

Der Kühler 18 weist ein Kühlerbündel 19 auf, durch das Kühlwasser geleitet wird. Ferner ist an dem Kühler eine Gaskondensataustrittsleitung 20 vorgesehen. Kühlwasser, dass durch das Kühlerbündel 19 geleitet wird, kühlt das durch den Kühler 18 strömende Rohgas ab, wobei Kondensat, das in dem abgekühlten Rohgas ausfällt, über die Gaskondensataustrittsleitung 20 von dem Kühler 18 abgeführt wird.The radiator 18 has a radiator pack 19, is passed through the cooling water. Further, a gas condensate discharge line 20 is provided on the radiator. Cooling water that is passed through the radiator pack 19 cools the raw gas flowing through the radiator 18, and condensate precipitated in the cooled raw gas is discharged from the radiator 18 via the gas condensate outflow line 20.

Die in Figur 2 gezeigte Ausführungsform des Rohgaskühlsystems 1 unterscheidet sich von der in Figur 1 gezeigten Ausführungsform des Rohgaskühlsystems 1 dahingehend, dass gemäß der in Figur 2 gezeigten Ausführungsform das Rohgaskühlsystem 1 eine zweite Wärmetauscherstufe 13 aufweist, die mit einer Zwischenleitung 17 prozessflüssigkeitsleitend verbunden ist. Die zweite Wärmetauscherstufe 13 ist in dem Rohgaskühlsystem 1 derart integriert, dass in dem Prozessflüssigkeitskreislauf 14 die Prozessflüssigkeit von der Prozessflüssigkeitszufüh- rungsleitung 15 zu der ersten Wärmetauscherstufe 12 und schließlich über die Prozessflüssigkeitsabführungsleitung 16 zu dem Prozessflüssigkeitskreislauf 14 strömt. Dadurch ist in dem Rohgaskühlsystem 1 der erste Dampferzeuger 4, die zweite Wärmetauscherstufe 13, der zweite Dampferzeuger 8, die erste Wärmetauscherstufe 12 und der Kühler 18 in der Rohgasleitung 2 in Reihe angeordnet und von dem Rohgas in dieser Reihenfolge durchströmt.The embodiment of the raw gas cooling system 1 shown in FIG. 2 differs from the embodiment of the raw gas cooling system 1 shown in FIG. 1 in that, according to the embodiment shown in FIG. 2, the raw gas cooling system 1 has a second heat exchanger stage 13, which is connected to an intermediate line 17 in a process fluid-conducting manner. The second heat exchanger stage 13 is integrated in the raw gas cooling system 1 such that in the process fluid circuit 14 the process fluid from the process fluid supply line 15 to the first heat exchanger stage 12 and finally flows via the process liquid discharge line 16 to the process liquid circuit 14. Thereby, in the raw gas cooling system 1, the first steam generator 4, the second heat exchanger stage 13, the second steam generator 8, the first heat exchanger stage 12, and the radiator 18 are arranged in series in the raw gas line 2 and flowed through by the raw gas in this order.

Die in Figur 3 gezeigte Ausführungsform des Rohgaskühlsystems 1 unterscheidet sich von der in Figur 2 gezeigten Ausführungsform des Rohgaskühlsystems 1 dahingehend, dass die zweite Wärmetauscherstufe 13 und der zweite Dampferzeuger 8 nicht in Reihe, sondern parallel zueinander geschaltet sind. So weist das Rohgaskühlsystem 1 gemäß Figur 3 stromab des ersten Dampferzeugers 4 einen ersten Rohgasleitungsabschnitt 22 auf, von dem ein zweiter Rohgasleitungsabschnitt 23 sich abzweigt. Nach dieser Abzweigung des zweiten Rohgasleitungsabschnitts 23 ist in dem ersten Rohgasleitungsabschnitt 22 die zweite Wärmetauscherstufe 13 vorgesehen, wobei in dem zweiten Roh- gasleitungsabschnitt 23 der zweite Dampferzeuger 8 vorgesehen ist. Stromab des zweiten Dampferzeugers 8 befindet sich ein dritter Rohrgasleitungsabschnitt 24, der in den stromab der zweiten Wärmetauscherstufe 13 vorgesehenen vierten Rohgasleitungsabschnitt 25 mündet und zusammen zu der ersten Wärmetau- scherstufe 12 führt.The embodiment of the raw gas cooling system 1 shown in FIG. 3 differs from the embodiment of the raw gas cooling system 1 shown in FIG. 2 in that the second heat exchanger stage 13 and the second steam generator 8 are not connected in series but in parallel with one another. Thus, the raw gas cooling system 1 according to FIG. 3 downstream of the first steam generator 4 has a first crude gas line section 22, from which a second crude gas line section 23 branches off. After this branching of the second crude gas line section 23, the second heat exchanger section 13 is provided in the first crude gas line section 22, the second steam generator 8 being provided in the second raw gas line section 23. Downstream of the second steam generator 8 there is a third pipe gas line section 24, which opens into the fourth crude gas line section 25 provided downstream of the second heat exchanger section 13 and leads together to the first heat exchanger stage 12.

Beispielsweise strömt in der in Figur 3 gezeigten Ausführungsform des Rohgaskühlsystems 1 von der Rohgasvorkühlungs- einrichtung 3 das Rohgas mit einer Temperatur von 205 0C zu dem ersten Dampferzeuger 4. In dem ersten Dampferzeuger 4 wird aus dem Speisewasser, das durch die erste Speisewasserzuleitung 5 dem ersten Dampferzeuger 4 zugeführt wird, der erste Dampf erzeugt, der mit der ersten Dampfleitung 6 von dem ersten Dampferzeuger 4 abgeführt wird und einen Druck von ca. 6,7 bar hat. Der erste Dampf ist geeignet der Stromerzeugung und/oder der Prozessdampfversorgung 7 zugeführt zu werden . Von dem ersten Dampferzeuger 4 strömt durch den ersten Rohgasleitungsabschnitt 22 das Rohgas mit einer Temperatur von 174 °C und wird dem zweiten Dampferzeuger 8 via den zweiten Rohrgasleitungsabschnitt 23 und der zweiten Wärmetauscherstu- fe 13 via den ersten Rohrgasleitungsabschnitt 22 zugeführt. In dem zweiten Dampferzeuger 8 wird mit dem durch die zweite Speisewasserzuführleitung 9 zugeführten Speisewasser der zweite Dampf erzeugt, der mit der zweiten Dampfleitung 10 abgeführt wird und ca. 4 bar hat. Der zweite Dampf ist geeignet der Brennstofftrocknung und/oder der Stromerzeugung und/oder der Prozessdampferzeugung 11 zugeführt zu werden.For example, the Rohgaskühlsystems 1, the raw gas flows in the direction shown in Figure 3 embodiment of the Rohgasvorkühlungs- device 3 with a temperature of 205 0 C to the first steam generator 4. In the first steam generator 4 is from the feedwater that the by the first feed water 5 first steam generator 4 is supplied, the first generated steam, which is discharged with the first steam line 6 from the first steam generator 4 and has a pressure of about 6.7 bar. The first steam is suitable to be supplied to the power generation and / or the process steam supply 7. From the first steam generator 4 flows through the first Rohgasleitungsabschnitt 22, the raw gas at a temperature of 174 ° C and the second steam generator 8 via the second tube gas section 23 and the second Wärmetauscherstu- fe 13 via the first pipe gas line section 22 is supplied. In the second steam generator 8, the second steam, which is discharged with the second steam line 10 and has approximately 4 bar, is generated by the feed water supplied through the second feed water feed line 9. The second steam is suitable to be supplied to the fuel drying and / or the power generation and / or the process steam generation 11.

Das Rohgas tritt aus der zweiten Wärmetauscherstufe 13 mit einer Temperatur von 158 0C via den vierten Rohgasleitungsab- schnitt 25 aus und vermischt sich mit dem Rohgas aus dem dritten Rohgasleitungsabschnitt 24 zu einem Rohgasgemisch mit einer Mischtemperatur von 163 0C. Dieses Rohgasgemisch durchströmt die erste Wärmetauscherstufe 12, wobei das Rohgas die erste Wärmetauscherstufe 12 mit 129 0C verlässt. Nachdem das Rohgasgemisch den Kühler 18 durchströmt hat, hat das Rohgasgemisch eine Temperatur von 40 0C und ist geeignet, der Rohgasreinigungsanlage 21 zugeführt zu werden.The raw gas leaves the second heat exchanger stage 13 at a temperature of 158 0 C via the fourth Rohgasleitungsab- section 25 and mixed with the raw gas from the third Rohgasleitungsabschnitt 24 to a crude gas mixture with a mixing temperature of 163 0 C. This crude gas mixture flows through the first Heat exchanger stage 12, wherein the raw gas leaves the first heat exchanger stage 12 at 129 0 C. After the crude gas mixture has passed through the radiator 18, the crude gas mixture has a temperature of 40 0 C and is adapted to be fed to the raw gas cleaning 21st

Von dem Prozessflüssigkeitskreislauf 14 wird die Prozessflüs- sigkeit in der Prozessflüssigkeitszuführleitung 15 mit einer Temperatur von 66 0C der ersten Wärmetauscherstufe 12 zugeführt. Die Prozessflüssigkeit tritt aus der ersten Wärmetauscherstufe 12 über die Zwischenleitung 17 aus und durchströmt die zweite Wärmetauscherstufe 13. Am Austritt der zweiten Wärmetauscherstufe 13 hat die Prozessflüssigkeit eine Temperatur von 150°C und wird dem Prozessflüssigkeitskreislauf 14 wieder zugeführt. From the process fluid circuit 14, the Prozessflüs- sigkeit is fed in the Prozessflüssigkeitszuführleitung 15 having a temperature of 66 0 C of the first heat exchanger stage 12th The process liquid exits from the first heat exchanger stage 12 via the intermediate line 17 and flows through the second heat exchanger stage 13. At the outlet of the second heat exchanger stage 13, the process liquid has a temperature of 150 ° C. and is returned to the process fluid circuit 14.

Claims

Patentansprüche claims 1. Rohgaskühlsystem (1) für eine Brennstoffvergasungsanlage, mit der Rohgas als Produkt einer Vergasung eines Brennstoffs erzeugbar ist, aufweisend einen ersten Dampferzeuger (4), einen zweiten Dampferzeuger (8) und eine erste Wärmetauscherstufe (12), die in Reihe oder parallel geschaltet von dem Rohgas nacheinander durchströmbar sind, wobei der zweite Dampferzeuger (8) stromab des ersten Dampferzeugers (4) ange- ordnet ist und eingerichtet ist Dampf zu erzeugen, dessenA raw gas cooling system (1) for a fuel gasification plant capable of producing raw gas as a product of gasification of a fuel, comprising a first steam generator (4), a second steam generator (8), and a first heat exchanger stage (12) connected in series or in parallel the raw gas can be flowed through in succession, the second steam generator (8) being arranged downstream of the first steam generator (4) and being arranged to generate steam Druckniveau niedriger ist als das des mit dem ersten Dampferzeuger (4) erzeugbaren Dampfs, und die erste Wärmetauscherstufe (12) stromab des zweiten Dampferzeugers (8) angeordnet und eingerichtet ist eine Prozessflüssigkeit in einem Pro- zessflüssigkeitskreislauf (14) zu erwärmen.Pressure level is lower than that of the first steam generator (4) producible steam, and the first heat exchanger stage (12) downstream of the second steam generator (8) and arranged to heat a process liquid in a process liquid circuit (14). 2. Rohgaskühlsystem gemäß Anspruch 1, wobei das Rohgaskühlsystem (1) eine zweite Wärmetauscherstufe (13) aufweist, die stromauf des zweiten Dampferzeugers (8) angeordnet ist, so dass das Rohgas nacheinander durch den ersten Dampferzeuger2. raw gas cooling system according to claim 1, wherein the raw gas cooling system (1) has a second heat exchanger stage (13), which is arranged upstream of the second steam generator (8), so that the raw gas successively through the first steam generator (4), die zweite Wärmetauscherstufe (13), den zweiten Dampferzeuger (8) und die erste Wärmetauscherstufe (12) leitbar ist und die Prozessflüssigkeit von der ersten Wärmetauscherstufe (12) zu der zweiten Wärmetauscherstufe (13) leitbar ist.(4), the second heat exchanger stage (13), the second steam generator (8) and the first heat exchanger stage (12) can be conducted and the process fluid from the first heat exchanger stage (12) to the second heat exchanger stage (13) is conductive. 3. Rohgaskühlsystem gemäß Anspruch 1, wobei das Rohgaskühlsystem (1) eine zweite Wärmetauscherstufe (13) aufweist, die parallel zu dem zweiten Dampferzeuger (8) angeordnet ist, so dass das Rohgas von dem ersten Dampferzeuger (4), parallel durch die zweite Wärmetauscherstufe (13) und den zweiten3. raw gas cooling system according to claim 1, wherein the raw gas cooling system (1) has a second heat exchanger stage (13), which is arranged parallel to the second steam generator (8), so that the raw gas from the first steam generator (4), in parallel through the second heat exchanger stage (13) and the second Dampferzeuger (8) und schließlich durch die erste Wärmetauscherstufe (12) leitbar ist und die Prozessflüssigkeit von der ersten Wärmetauscherstufe (12) zu der zweiten Wärmetauscherstufe (13) leitbar ist.Steam generator (8) and finally through the first heat exchanger stage (12) is conductive and the process liquid from the first heat exchanger stage (12) to the second heat exchanger stage (13) is conductive. 4. Rohgaskühlsystem gemäß einem der Ansprüche 1 bis 3, wobei das Rohgaskühlsystem einen Kühler (18) aufweist, der stromab der ersten Wärmetauscherstufe (12) angeordnet ist, so dass das Rohgas nacheinander durch die erste Wärmetauscherstufe (12) und den Kühler (18) leitbar ist.4. raw gas cooling system according to one of claims 1 to 3, wherein the raw gas cooling system comprises a cooler (18) which is arranged downstream of the first heat exchanger stage (12), so that the raw gas is successively through the first heat exchanger stage (12) and the radiator (18) is conductive. 5. Brennstoffvergasungsanlage für ein Gas- und Dampfkraft- werk, mit der Rohgas als Produkt einer Vergasung eines Brennstoffs erzeugbar ist, aufweisend ein Rohgaskühlsystem (1) gemäß einem der Ansprüche 1 bis 6.5. fuel gasification plant for a gas and steam power plant, with the raw gas as a product of gasification of a fuel can be generated, comprising a raw gas cooling system (1) according to any one of claims 1 to 6. 6. Gas- und Dampfkraftwerk mit einer Brennstoffvergasungsan- läge gemäß Anspruch 5.6. Gas and steam power plant with a fuel gasification plant according to claim 5. 7. Gas- und Dampfkraftwerk gemäß Anspruch 6, wobei das Gas- und Dampfkraftwerk den Prozessflüssigkeitskreislauf als einen Zwischenkreislauf (14) aufweist, der zum Wärmetransport zu einer Anlagenkomponente des Gas- und Dampfkraftwerk eingerichtet ist.7. Gas and steam power plant according to claim 6, wherein the gas and steam power plant, the process fluid circuit as an intermediate circuit (14), which is adapted for heat transfer to a plant component of the gas and steam power plant. 8. Gas- und Dampfkraftwerk gemäß Anspruch 7, wobei die Anlagenkomponente eine ReingasaufSättigung und/oder eine Turbi- nenkondensataufwärmung und/oder eine Zusatzwasservorentgasung ist .8. Gas and steam power plant according to claim 7, wherein the plant component is a clean gas to saturation and / or a turbine condensate heating and / or a Zusatzwasservorentgasung. 9. Gas- und Dampfkraftwerk gemäß einem der Ansprüche 6 bis 8, wobei das Gas- und Dampfkraftwerk eine Stromerzeugung und/oder eine Prozessdampfversorgung (7) aufweist, zu denen der von dem ersten Dampferzeuger erzeugte Dampf zuführbar ist .9. Gas and steam power plant according to one of claims 6 to 8, wherein the gas and steam power plant has a power generation and / or a process steam supply (7), to which the steam generated by the first steam generator can be fed. 10. Gas- und Dampfkraftwerk gemäß einem der Ansprüche 6 bis 9, wobei das Gas- und Dampfkraftwerk eine Stromerzeugung und/oder eine Prozessdampfversorgung und/oder eine Brennstofftrocknung (11) aufweist, zu denen der von dem zweiten Dampferzeuger erzeugte Dampf zuführbar ist. 10. Gas and steam power plant according to one of claims 6 to 9, wherein the gas and steam power plant has a power generation and / or a process steam supply and / or a fuel drying (11), to which the steam generated by the second steam generator can be fed.
PCT/EP2008/052856 2007-03-14 2008-03-11 Crude gas cooling system for a fuel supply plant Ceased WO2008110548A2 (en)

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DE3319711A1 (en) * 1983-05-31 1984-12-06 Kraftwerk Union AG, 4330 Mülheim COMBINED GAS TURBINE-STEAM TURBINE PLANT WITH UPstream COAL GASIFICATION PLANT
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