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WO1992001199A1 - Procede de sechage de combustibles, notamment de la lignite brut - Google Patents

Procede de sechage de combustibles, notamment de la lignite brut Download PDF

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Publication number
WO1992001199A1
WO1992001199A1 PCT/DE1991/000549 DE9100549W WO9201199A1 WO 1992001199 A1 WO1992001199 A1 WO 1992001199A1 DE 9100549 W DE9100549 W DE 9100549W WO 9201199 A1 WO9201199 A1 WO 9201199A1
Authority
WO
WIPO (PCT)
Prior art keywords
dryer
fluidized bed
vapor stream
dryers
steam
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/DE1991/000549
Other languages
German (de)
English (en)
Inventor
Heinz Spliethoff
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.)
Saarbergwerke AG
Original Assignee
Saarbergwerke AG
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 Saarbergwerke AG filed Critical Saarbergwerke AG
Publication of WO1992001199A1 publication Critical patent/WO1992001199A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/001—Heating arrangements using waste heat
    • F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
    • F26B23/004—Heating arrangements using waste heat recovered from dryer exhaust gases by compressing and condensing vapour in exhaust gases, i.e. using an open cycle heat pump system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • Method for drying fuels in particular raw lignite, wherein the dried fuels are at least partially burned in a power plant process to generate energy and / or heating and process heat.
  • a disadvantage of the known method using the own vapor stream as heating and fluidizing medium is the lack of controllability, for example as a function of load fluctuations in the power plant process with changing fuel requirements or of changes in the water / solids ratio drying items. Practically only constant load can be driven. Even small deviations can lead to uncontrollable malfunctions.
  • the invention is therefore based on the object of further developing a method of the type mentioned at the outset to regulate the power plant process.
  • This object is achieved in that at least two steam-heated dryers are used, the first with low-temperature steam from the water-steam cycle of the power plant process and / or part of the vapor stream from the second dryer and the second with one Part of the vapor stream of the first dryer is heated, the vapor streams being adiabatically compressed before being used as the heating medium.
  • the method according to the invention is characterized by a high degree of flexibility, ie controllability, when drying fuels, in particular raw lignite, and is therefore particularly well suited for use in power plant processes.
  • each of the dryers used is supplied not with self-generated heating steam but with a heating steam generated outside the respective dryer, the supply of the first dryer being very closely linked to the actual power plant process .
  • the circuit according to the invention of the dryers in relation to the heating steam or vapor guidance not all dryers need to be supplied with steam from the power plant process, but only the first one.
  • the dryers used are therefore expediently designed in such a way that the first dryer assigned to the power plant process with its task and its connections operates a power or power generation program of the power plant, while the second dryer burns practically in post-run mode fabric on stock, for example to supply a further power plant.
  • any known steam-heated dryer type can be used in the method according to the invention. Because of the good heat transfer in the fluidized bed, among other things, the use of a fluidized bed dryer is advisable, at least for the downstream second dryer, part of the vapor stream from the first dryer then being additionally drawn off as a fluidizing medium for the fluidized bed of the second dryer.
  • the first dryer is also a fluidized bed dryer
  • its supply with fluidizing medium in the start-up phase takes place initially from the steam cycle of the power plant process.
  • a part of ner in zwe ii + l "s Trock ⁇ resulting vapor stream is then first as a fluidized medium I ⁇ m
  • a further improvement in efficiency can be achieved in that the excess vapor flow amounts which occur in the dryer system when power is suddenly required to be reduced are stored in a water vapor accumulator and are then made available to the dryers as heating medium and / or carrier medium for the fluidized bed if required .
  • each further dryer is heated by at least one of the upstream dryers using part of the vapor flow and part of the vapor flow of each further dryer is used to heat at least one upstream dryer.
  • the figure shows a dryer system for raw brown coal consisting of two fluidized bed dryers 1 and 2, which is fed to the dryers via lines 3 and 4 in the wet state and is withdrawn as dry material via lines 5 and 6 from the dryer system. All or part of the dried lignite is burned in a power plant process to generate electrical energy and / or heating and process heat.
  • the vapor stream which arises with increasing heating in the dryer 1 is drawn off via a line 14, subjected to dust separation in a cyclone or electrostatic filter 15 and fed to a steam collector 17 via a line 16.
  • Some of the vapors produced in the steam collector 17 are adiabatically compressed in a vapor compressor 18 and then fed as a heating medium into the heat exchanger 20 of the second dryer 2 via a line 19.
  • This vapor stream which condenses with the material to be dried in the course of the indirect heat exchange, is drawn off via a line 21 and fed here to a treatment or use (not shown).
  • Another part of the vapor stream occurring in the steam collector 17 is introduced into the lower region of the dryer 2 via a line 22 and a conveying fan 23 as a fluidizing medium for the fluidized bed.
  • the vapor stream occurring in the dryer 2 is drawn off via a line 24, also dedusted in a further cyclone or electrostatic precipitator 25 and then introduced into an additional steam collector 27 via a line 26.
  • a portion of the vapors produced in the steam collector 27 is now adiabatically compressed in a vapor compressor 28, fed to the first dryer 1 as a heating medium via a line 29 and condensed there in a heat exchanger 30.
  • the condensate is withdrawn via a line 31 from the dryer system for further use.
  • Another part of the vapors obtained in the steam collector 27 is fed into the lower region of the dryer 1 as a fluidizing medium via a line 32, a conveying fan 33 and the line 13.
  • the dryers 2 and 3 are based on the same performance data and the same feedstocks, an equilibrium is established in the stationary state of the system in such a way that the supply of extraneous steam from the water-steam cycle of the power plant via the line 8 can be dispensed with.
  • the vapor stream occurring in a dryer is sufficient to cover the needs of the other heating and fluidizing medium.
  • the dryer 1 is heated with low-temperature steam from the water-steam cycle of the power plant in a separate heat exchanger 9, since in this way the clean condensate obtained can be returned directly to the power plant cycle.
  • a separate heat exchanger 9 for the low-temperature steam, but to feed it directly into the heat exchanger 30 via a non-return flap 39 and the line 40 shown in broken lines. In this procedure, however, it cannot be avoided that when vapors from line 29 and low-temperature steam from line 8 are used simultaneously as the heating medium, the condensate accumulating in heat exchanger 30 cannot be returned to the water-steam cycle of the power plant.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Selon un procédé de séchage de combustibles, notamment de la lignite brut, dans lequel les combustibles sont brulés, incinérés au moins en partie, dans une centrale électrique afin de générer de l'énergie et/ou de la chaleur de chauffage et de la chaleur industrielle, au moins deux séchoirs chauffés à la vapeur sont utilisés. Le premier est chauffé avec la vapeur à température réduite du circuit eau-vapeur de la centrale électrique et/ou avec une partie du courant de vapeur chaude du deuxième séchoir. Le deuxième séchoir est chauffé avec une partie du courant de vapeur chaude du premier séchoir, les courants de vapeur chaude étant condensés adiabatiquement avant leur utilisation comme milieu de chauffage.
PCT/DE1991/000549 1990-07-03 1991-07-03 Procede de sechage de combustibles, notamment de la lignite brut Ceased WO1992001199A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4020994A DE4020994A1 (de) 1990-07-03 1990-07-03 Verfahren zum trocknen von brennstoffen, insbesondere von rohbraunkohle
DEP4020994.6 1990-07-03

Publications (1)

Publication Number Publication Date
WO1992001199A1 true WO1992001199A1 (fr) 1992-01-23

Family

ID=6409478

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1991/000549 Ceased WO1992001199A1 (fr) 1990-07-03 1991-07-03 Procede de sechage de combustibles, notamment de la lignite brut

Country Status (4)

Country Link
EP (1) EP0489147A1 (fr)
AU (1) AU8100391A (fr)
DE (1) DE4020994A1 (fr)
WO (1) WO1992001199A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013023719A3 (fr) * 2011-08-16 2013-12-27 Rwe Generation Se Procédé pour faire fonctionner une centrale

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19601931C2 (de) * 1995-02-20 2000-09-21 Ver Energiewerke Ag Verfahren und Anordnung zum Betrieb eines mit Heizdampf beaufschlagten Trockners

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1081833B (de) * 1939-06-28 1960-05-12 Keller G M B H Trocknungsverfahren und Vorrichtung fuer vorwiegend nicht rieselfaehiges Gut
DE2923614A1 (de) * 1978-06-21 1980-01-10 Stal Laval Turbin Ab Anlage zum trocknen von festem material
US4245395A (en) * 1974-10-02 1981-01-20 Monash University Fluidized bed drying
DE2929486A1 (de) * 1979-07-20 1981-01-29 Hitachi Metals Ltd Verfahren zum dehydratisieren einer aufschlaemmung
DE3618333A1 (de) * 1986-05-30 1987-12-03 Kloeckner Humboldt Deutz Ag Verfahren und anlage zur kontinuierlichen trocknung feuchter schuettgueter, insbesondere feuchter kohle
EP0307744A2 (fr) * 1987-09-14 1989-03-22 Waagner-Biro Aktiengesellschaft Installation de séchage à lit-fluidisé pour marchandises en vrac
AT389466B (de) * 1987-04-30 1989-12-11 Waagner Biro Ag Verfahren und anlage zur thermischen behandlung von guetern mit feststoffanteil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1081833B (de) * 1939-06-28 1960-05-12 Keller G M B H Trocknungsverfahren und Vorrichtung fuer vorwiegend nicht rieselfaehiges Gut
US4245395A (en) * 1974-10-02 1981-01-20 Monash University Fluidized bed drying
DE2923614A1 (de) * 1978-06-21 1980-01-10 Stal Laval Turbin Ab Anlage zum trocknen von festem material
DE2929486A1 (de) * 1979-07-20 1981-01-29 Hitachi Metals Ltd Verfahren zum dehydratisieren einer aufschlaemmung
DE3618333A1 (de) * 1986-05-30 1987-12-03 Kloeckner Humboldt Deutz Ag Verfahren und anlage zur kontinuierlichen trocknung feuchter schuettgueter, insbesondere feuchter kohle
AT389466B (de) * 1987-04-30 1989-12-11 Waagner Biro Ag Verfahren und anlage zur thermischen behandlung von guetern mit feststoffanteil
EP0307744A2 (fr) * 1987-09-14 1989-03-22 Waagner-Biro Aktiengesellschaft Installation de séchage à lit-fluidisé pour marchandises en vrac

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013023719A3 (fr) * 2011-08-16 2013-12-27 Rwe Generation Se Procédé pour faire fonctionner une centrale

Also Published As

Publication number Publication date
DE4020994A1 (de) 1992-01-09
EP0489147A1 (fr) 1992-06-10
AU8100391A (en) 1992-02-04

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