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WO2008128465A1 - Système et procédé de traitement de boues humides par séchage et incinération - Google Patents

Système et procédé de traitement de boues humides par séchage et incinération Download PDF

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Publication number
WO2008128465A1
WO2008128465A1 PCT/CN2008/070734 CN2008070734W WO2008128465A1 WO 2008128465 A1 WO2008128465 A1 WO 2008128465A1 CN 2008070734 W CN2008070734 W CN 2008070734W WO 2008128465 A1 WO2008128465 A1 WO 2008128465A1
Authority
WO
WIPO (PCT)
Prior art keywords
sludge
incineration
drying
steam
wet
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/CN2008/070734
Other languages
English (en)
Chinese (zh)
Inventor
Kunio Yoshikawa
Tongyu Huang
Lin Zhang
Norihiko Suzuki
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.)
SHENZHEN ECO-SOLUTION TECHNOLOGY Corp
Original Assignee
SHENZHEN ECO-SOLUTION TECHNOLOGY 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 SHENZHEN ECO-SOLUTION TECHNOLOGY Corp filed Critical SHENZHEN ECO-SOLUTION TECHNOLOGY Corp
Publication of WO2008128465A1 publication Critical patent/WO2008128465A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/028—Heating arrangements using combustion heating using solid fuel; burning the dried product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/08—Drying solid materials or objects by processes not involving the application of heat by centrifugal treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/06—Treatment of sludge; Devices therefor by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing

Definitions

  • the invention relates to an organic waste treatment device and a process, in particular to a dry incineration treatment system and a treatment process of a wet sludge. Background technique
  • Wet sludge is a by-product of sewage treatment.
  • the composition of sludge is extremely complex. It mainly contains about 80 ⁇ 90° scoop of water, and other organic materials that can be recycled, various organic substances, various trace elements and possible environment. Pathogenic microorganisms, parasitic eggs, heavy metals, etc. that cause adverse effects.
  • the decontamination and resource treatment of wet sludge is an important issue in the world's ecological environment protection.
  • the wet sludge needs to be incinerated in the incinerator at a temperature of 800 to 950 ° C, and the requirements for the equipment are relatively high and the energy consumption is relatively large.
  • the use of the device and the process has the disadvantages of large initial investment and high operating cost.
  • Japanese Patent No. 3,613,567 discloses a fuel manufacturing apparatus and a fuel manufacturing method in which high-humidity waste is placed in a specific processing vessel and is pressurized with high-pressure steam, and then the temperature and pressure in the processing vessel are maintained within a given range. At the time, the binding molecules are separated to produce a micronized fuel.
  • the apparatus and method disclosed in the practice of the patent often have a resulting fuel product containing The disadvantages of high water and inability to be used directly; and when used for the treatment of wet sludge, the obtained products are not easily dehydrated and dried by the conventional dewatering devices commonly used in the industry and the waste treatment industry, and are naturally dewatered.
  • the treatment covers a large area, especially in the large-scale treatment of waste.
  • the sewage and the vaporized gas flowing during the placement process are extremely unfriendly to the environment, and tend to produce subsequent follow-up to these deposits.
  • One processing increases processing costs.
  • the object of the present invention is to provide a dry incineration treatment system and a treatment method for wet sludge, aiming at solving the above-mentioned defects in the prior art, and solving sludge resource regeneration in the manner of environmental protection, energy saving, high resource utilization, and low operating cost. problem.
  • the technical solution adopted by the present invention to solve the technical problem is to provide a wet sludge drying incineration treatment system, comprising: a low temperature pyrolysis reaction device for performing low temperature pyrolysis reaction of wet sludge and saturated water vapor, so that The high-molecular organic matter in the wet sludge is converted into a low-molecular organic substance to destroy the sludge holding water structure; the centrifugal filtering device is used for centrifugally filtering the pyrolyzed wet sludge by mechanical separation to obtain a water content of 55 to 60°.
  • the wet sludge drying incineration treatment system provided by the present invention further comprises a steam condensing device for condensing and collecting the spent steam converted from the saturated water vapor in the low temperature pyrolysis reaction device.
  • the wet sludge dry incineration treatment system provided by the present invention further comprises a filtrate recovery device for collecting the filtrate generated by mechanically separating and dewatering the wet sludge in the centrifugal filter device, and collecting the liquid from the steam condensation device. condensate;
  • the wet sludge drying incineration treatment system provided by the present invention further comprises a drying device disposed between the centrifugal filtering device and the sludge incineration device for drying and removing moisture in the semi-dry sludge after centrifugation filtration.
  • a dry sludge type solid fuel having a water content of 10 to 40 ° is obtained.
  • the wet sludge drying incineration treatment system provided by the invention further comprises a steam condensing device
  • a gas scrubbing device is disposed between the sludge incineration device and the residual gas from the steam condensing device and/or the drying device for washing and then sent to the sludge incineration device.
  • the wet sludge drying incineration treatment system provided by the present invention further comprises a sewage treatment device for treating sewage generated by the filtrate recovery device, and/or a flue gas treatment disposed on the sludge incineration device A device for treating harmful fumes emitted from incineration.
  • the wet sludge drying incineration treatment system has a working condition of a temperature of 150 to 300 ° C and a pressure of 1.50 - 3.00 I f3 ⁇ 4.
  • a sludge drying incineration treatment process comprising the following steps:
  • the step (11) is further included: the spent steam converted from saturated steam in the low temperature pyrolysis reaction device is passed to a steam condensing device for condensation treatment.
  • the sludge drying and incineration treatment process further includes a step (21): collecting a filtrate obtained by centrifugally dehydrating the wet sludge in the centrifugal filtration device and the condensed condensate to obtain an organic-rich material. Liquid organic fertilizer.
  • the step (2,) is further included: drying the semi-dry sludge after centrifugation in the step (2) to obtain a water content of
  • the step (22) is further included: the residual gas from the steam condensing device or the drying device is washed and then sent to the sludge incineration device.
  • the wet sludge drying treatment system and the treatment process provided by the invention have the beneficial effects of: 1) environmental protection.
  • the sterilization and disinfection process is completed quickly, and the steam and dry exhaust gas are recovered and transported through the closed vessel and the pipeline through the negative pressure, and then condensed and sent to the incinerator for incineration to completely deodorize. After the semi-dry sludge is incinerated, it is completely harmless. .
  • the sludge can be converted into high-quality liquid organic fertilizer and solid fertilizer or fuel.
  • the fuel can be burned independently. It can be sent to the system incinerator to produce saturated steam. It can also be sold separately.
  • the daily processing capacity can be adjusted arbitrarily in units of 10 tons, 50 tons, 100 tons, and 200 tons, and is suitable for municipal sludge (including sewage sludge) treatment in cities of various sizes.
  • Multifunctional It is also suitable for the resource and harmless treatment of various solid organic wastes (such as kitchen waste, municipal waste, animal waste, etc.).
  • FIG. 1 is a process flow diagram of an embodiment of a wet sludge drying treatment system and process provided by the present invention
  • Example 2 is a process of another embodiment of a wet sludge drying treatment system and process provided by the present invention Flow chart.
  • Fig. 1 it is a process flow diagram of an embodiment of the wet sludge drying treatment system and process of the present invention.
  • the wet sludge (about 80% water) is put into a low-temperature pyrolysis reactor, and a pressure of 1. 5 ⁇ 3. 0I f, saturated water vapor at a temperature of 150-300 ° C; It is a closed horizontal pressure vessel with a stirring device.
  • the wet sludge and steam are stirred and mixed uniformly in the kettle. Under the action of heat and pressure, the solid phase structure of the organic matter in the sludge, colloidal flocs and other solid phases are destroyed.
  • the material holding water structure fully releases the physical and chemical combined water in the sludge, thereby greatly improving the dewatering and drying performance of the sludge, so that most of the water in the dewatered sludge can be liquid water by subsequent mechanical separation.
  • the form is pulled out and the other part is removed with the lack of steam.
  • the pyrolyzed wet sludge is then sent to a horizontal screw discharge filter centrifuge (other suitable centrifugal dewatering machines are also available) for dewatering, after low temperature pyrolysis of the wet sludge, in the centrifugal dewatering machine Most of the water (>70%) can be removed by centrifugal filtration.
  • the moisture content of the dehydrated mud cake (semi-dry sludge) is about 55 ⁇ 60%.
  • the centrifugally filtered mud cake is sent to a sludge incinerator for incineration together with the insoluble gas in the condensed steam, and the generated heat is generated by the heat generated by the incineration in the waste heat boiler system, and is saturated.
  • the steam is supplied to the low temperature pyrolysis reactor. In this way, through internal resource recycling, the entire system does not require additional fuel consumption during operation, which greatly reduces energy consumption.
  • the filtrate which has been removed by the centrifugal dewatering machine can be collected in a filtrate recovery device to obtain a liquid organic fertilizer rich in organic matter.
  • Example 2 is a process flow diagram of another embodiment of the wet sludge drying treatment system and process of the present invention. In this process, based on the process flow of Embodiment 1, the following devices and process steps are added:
  • a hollow paddle dryer (also optionally a fluidized bed drying device or a gas flow drying device) is provided between the centrifugal dewatering machine and the sludge incinerator for drying to remove the semi-dry sludge after centrifugation filtration.
  • the water in the obtained water is supplied to the sludge incinerator after the dried sludge-type solid fuel having a water content of 10 to 40°.
  • the saturated steam generated by the waste heat boiler is not only supplied to the low temperature cracking reactor, but also selectively supplies heat to the drying equipment for sludge drying.
  • the filtrate removed from the centrifugal dewatering machine is collected in a filtrate recovery device to obtain a liquid organic fertilizer rich in organic matter.
  • the spent steam generated by the low temperature pyrolysis reactor is sent to a steam condenser for condensation treatment, and the condensate obtained after the treatment is also collected into the above filtrate recovery device.
  • a gas scrubber is provided between the steam condenser and the sludge incinerator for washing the tail gas from the steam condenser and/or the dryer before feeding it to the sludge incinerator.
  • a sewage treatment system in the filtrate recovery device for treating harmful substances in the collected filtrate and condensate; and, in the sludge incinerator
  • a flue gas treatment system can be provided to treat the waste gas generated by incineration and then discharge it into the atmosphere for environmental protection.
  • the treatment system and process can be used not only for the drying of wet sludge, but also for the treatment of other aqueous organic wastes, medical waste, hazardous waste, liqueur, scum and kitchen waste.
  • the low temperature pyrolysis process of the present invention first improves the dewatering performance of the sludge. After low temperature pyrolysis, most of the moisture (>70%) in the 80% dewatered sludge can be removed by centrifugal filtration. 1 ton of 80% moisture wet sludge with a total water content of 800kg, which can be removed by centrifugal dehydration after low temperature pyrolysis. 570kg of liquid water in the filter, the moisture content of the filter cake is reduced to 60%. The remaining water in the filter cake is 230kg.
  • the low temperature pyrolysis process secondly improves the drying performance of the sludge.
  • the subsequent drying process can be reduced to 10% by natural air drying or blast drying under the conditions of time and time, instead of using a heating and drying process.
  • the factory operation proved that the solid fuel was prepared by low-temperature pyrolysis technology, which reduced the total energy consumption by 50% compared with the direct heating and drying of the sludge.
  • the 8% of the wet sludge is hydrothermally evaporated. Kg.
  • the sludge is dried to the same extent.
  • the consumption of natural gas is about 16 cubic meters. . Based on this, it is calculated that the low-temperature pyrolysis and heat drying of 1 ton of wet sludge by using the scheme of the present invention consumes about 38 cubic meters of natural gas before and after, which is equivalent to 46% of the direct thermal drying method and 54% energy saving.
  • each ton of wet sludge requires heat to evaporate 128 kg of water, consumes 13.7 cubic meters of natural gas, plus 16 cubic meters of natural gas consumed by pyrolysis, a total of about 29. 7 Square meter, saves 58% compared to direct thermal drying
  • the semi-dry sludge (40% ⁇ 60 ° / water) produced by the process of the invention has a calorific value up to the independent combustion requirement, and no auxiliary fuel can be added.
  • the heat generated by the incinerator is absorbed by the waste heat boiler to produce saturated steam.
  • the steam of the waste heat boiler is supplied to the low temperature pyrolysis reactor and the paddle dryer through the main steam pipe.
  • semi-dry sludge incineration is used to supply the energy required for pyrolysis and drying, and the supply is greater than demand, and the thermal energy surplus is nearly 30%. That is to say, as long as 70% of the semi-dry sludge is sent to the incinerator to meet the heat source requirements of the system, the remaining 30% of the semi-dry sludge can be used for other purposes, such as ceramsite raw materials, or power plant auxiliary fuel. Fertilizer, etc.
  • the internal circulation of the waste heat by semi-dry sludge incineration can fully meet the fuel demand of the system itself. Once the system is started, no external fuel needs to be added. The demand for external fuel is zero.
  • the direct thermal drying process the 80% wet sludge is semi-dried to 40%, and the heat consumption is converted to 71. 3 cubic meters.
  • the resulting semi-dry sludge effectively supplies heat to a natural gas of 47. 3 cubic meters.
  • the heat supply is less than the heat demand, so it is necessary to supplement the natural gas by 34 cubic meters.
  • Natural gas is based on the price of 4 yuan / cubic meter.
  • the direct drying method is more expensive than the one using the invention.
  • the fuel cost per ton of wet sludge is 136 yuan.
  • the sludge is rapidly inactivated by low temperature pyrolysis in a closed reactor. If the filtrate is treated as sewage, it can be discharged by a mature process.
  • the tail gas of the incinerator adopts the semi-dry method + active carbon adsorption + bag processing technology. At the same time, because the sludge contains less chlorine, the amount of dioxin produced is extremely small, and all pollutants are easier to control.
  • the sludge storage bins and the material transfer bins are all closed containers with a certain negative pressure to ensure no odor leakage.
  • the volatile gas and steam in the steam, dehydration and drying processes after the pyrolysis reaction are collected by the negative pressure, and the water is recovered and dissolved by the steam condenser and the gas scrubber, and the insoluble gas is not condensed. It is directly incinerated by introducing it into the sludge incinerator to thoroughly deodorize it. The entire process is carried out in a closed vacuum vessel or pipe to ensure that the odor does not spread into the workshop. Ensure that the workshop air is clean.
  • the flue gas treatment method adopts a semi-dry absorption tower, activated carbon adsorption, bag filter process, and after the netification reaches the discharge standard, it is discharged into the atmosphere through the induced draft fan and the soot.
  • the flue gas at the exit of the boiler enters the acid gas absorption tower with a large amount of soot and harmful gases, and simultaneously sprays the lime into the absorption tower to neutralize the H 1 , S [ and HF in the flue gas to form C3 ⁇ 4C12. C3 ⁇ 4SOk C&F2 particles are dropped to the bottom of the absorber.
  • Activated carbon is sprayed in front of the bag filter to absorb heavy metals and dioxins in the flue gas.
  • the filtrate obtained by dehydration by a centrifuge is rich in organic matter and contains high concentrations of potassium and nitrogen. It is a high-quality concentrated liquid organic fertilizer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Hydrology & Water Resources (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Treatment Of Sludge (AREA)

Abstract

La présente invention concerne un système de traitement des boues humides par séchage et incinération, qui comprend un appareil de pyrolyse à basse température, un appareil centrifugeur, un condenseur de vapeur, un appareil de récupération du filtrat et un appareil d'incinération des boues. Le procédé de traitement correspondant consiste à faire réagir les boues humides avec de la vapeur saturée dans des conditions de basse température pour assurer la décomposition thermique, à centrifuger les boues décomposées humides, à condenser la vapeur non saturée produite par la pyrolyse dans le condenseur, à récupérer le condensat et le filtrat dans l'appareil centrifugeur au moyen de l'appareil de récupération du filtrat, et à utiliser les boues centrifugées et le gaz restant issu du condenseur de vapeur en tant que combustible à incinérer.
PCT/CN2008/070734 2007-04-18 2008-04-17 Système et procédé de traitement de boues humides par séchage et incinération Ceased WO2008128465A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200710074069.9 2007-04-18
CN2007100740699A CN101290121B (zh) 2007-04-18 2007-04-18 湿污泥干化焚烧处理系统与工艺

Publications (1)

Publication Number Publication Date
WO2008128465A1 true WO2008128465A1 (fr) 2008-10-30

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PCT/CN2008/070734 Ceased WO2008128465A1 (fr) 2007-04-18 2008-04-17 Système et procédé de traitement de boues humides par séchage et incinération

Country Status (2)

Country Link
CN (1) CN101290121B (fr)
WO (1) WO2008128465A1 (fr)

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