CN109385309A - A kind of electricity generation system and method for coal-fired coupling domestic garbage pyrolysis - Google Patents

A kind of electricity generation system and method for coal-fired coupling domestic garbage pyrolysis Download PDF

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Publication number
CN109385309A
CN109385309A CN201811516366.9A CN201811516366A CN109385309A CN 109385309 A CN109385309 A CN 109385309A CN 201811516366 A CN201811516366 A CN 201811516366A CN 109385309 A CN109385309 A CN 109385309A
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China
Prior art keywords
bed
pyrolysis
furnace
fixed
coal
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CN201811516366.9A
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Chinese (zh)
Inventor
严密
张思成
刘建雍
周宣佑
王国斌
苏红才
叶东尼
翁周超
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Priority to CN201811516366.9A priority Critical patent/CN109385309A/en
Publication of CN109385309A publication Critical patent/CN109385309A/en
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/02Fixed-bed gasification of lump fuel
    • C10J3/20Apparatus; Plants
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72Other features
    • C10J3/82Gas withdrawal means
    • C10J3/84Gas withdrawal means with means for removing dust or tar from the gas
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/09Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0903Feed preparation
    • C10J2300/0906Physical processes, e.g. shredding, comminuting, chopping, sorting
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/16Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1603Integration of gasification processes with another plant or parts within the plant with gas treatment
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency

Abstract

The invention discloses the electricity generation systems and method of a kind of coal-fired coupling domestic garbage pyrolysis, comprising: for rubbish coke and coal dust to be mixed burning, generates steam with the circulating fluidized bed combustion coal system of heat supply or power generation;For converting the house refuse after drying to the fixed bed refuse pyrolysis system of coke and synthesis gas;For isolating synthesis gas cooling and purifying tar and obtaining the synthesis gas processing system of combustible gas;Coal dust multifuel combustion rubbish coke delivers equipment at full capacity by the present invention, and improves boiler thermal efficiency by mixing burning synthesis gas, efficiently disposes house refuse while reducing consumption coal.

Description

A kind of electricity generation system and method for coal-fired coupling domestic garbage pyrolysis
Technical field
The invention belongs to solidification disposal of waste field, in particular to the electricity generation system of a kind of coal-fired coupling domestic garbage pyrolysis and side Method.
Background technique
With the quickening of urbanization process, the problem of " garbage-surrounded city ", is increasingly prominent, how to realize the recycling of rubbish without Evilization disposition becomes urgent problem to be solved.Current most widely used method of disposal is waste incineration and generating electricity, but at this stage its Treating capacity is still unable to satisfy demand.Standard compliant garbage incinerating power plant is created to need to expend flood tide fund and be faced with The problems such as " neighbour keeps away effect ", while the harmful substances such as dioxin of Refuse Incineration Process generation, environment is caused inevitably Secondary pollution.
The pyrolytic gasification technology of rubbish is another heat treatment mode, and principle is unstable using the heat of organic matter in garbage It is qualitative, it is heated under anaerobic or anoxia condition, is allowed to decompose under the high temperature conditions, form combustible gas, tar liquid, solid can Fire coke.Pyrolysismethod is more conducive to the efficient recycling of the energy compared to incineration method, and to more environment-friendly.Pyrolytic process is to restore Property atmosphere under carry out, smoke discharge amount is small, and dust entrainment is few, and the generation of SOx, NOx and HCl also can be by under reducing atmosphere To certain restrictions, while lower air equivalent is than the generation of inhibition dioxin.
On the other hand, the more attention with government to environmental problem, coal-burning power plant are gradually eliminated, steam turbine It mostly can not oepration at full load.Rubbish is disposed with wide using the boiler and its mature smoke processing system of coal-burning power plant Application prospect.However garbage water is high, calorific value is low, and geometric dimension is big, and physical parameter and coal dust difference are excessive, can not Effectively with coal dust direct blending combustion.And rubbish coke strength is smaller, by being crushed its physical parameter closer to coal, is easy to With coal multifuel combustion.
Therefore, it is necessary to design a kind of system and method for coal-fired coupling refuse pyrolysis, convert garbage into for coke and with Coal mixes burning, while generating combustible gas, and pressurization is passed through blended burning of coal fired boiler, obtains cogenerated products.
Summary of the invention
The purpose of the present invention is realizing the pyrolysis of the efficient stable of house refuse, and the thermal decomposition product of house refuse is sent into and is fired Coal burning boiler and coal mix burning, and the coal-fired load of a part is substituted in the case where not influencing coal-burning boiler system, reaches garbage as resource Secondary pollution is reduced simultaneously.
For this purpose, first technical solution of the invention is: a kind of electricity generation system of coal-fired coupling domestic garbage pyrolysis, packet It includes:
For rubbish coke and coal dust to be mixed burning, steam is generated with the circulating fluidized bed combustion coal system of heat supply or power generation;
For converting the house refuse after drying to the fixed bed refuse pyrolysis system of coke and synthesis gas;
For isolating synthesis gas cooling and purifying tar and obtaining the synthesis gas processing system of combustible gas;
The circulating fluidized bed combustion coal system include fluid-bed combustion furnace, furnace exit cyclone separator, feed back leg and Combustion furnace screw(-type) feeder, fluid-bed combustion furnace left side lower section are equipped with coal dust material inlet, are connected with combustion furnace screw(-type) feeder;Stream The outlet in fluidized bed combustion furnace roof portion is connect with furnace exit cyclone separator to be communicated;It is set on the burner hearth of the fluid-bed combustion furnace There are 4~8 groups of gas nozzles;The fluid-bed combustion furnace lower right-hand side is connected with feed back leg;Fluidized bed combustion furnace bottom is equipped with Lower cinder notch;
The fixed bed refuse pyrolysis system includes fixed-bed pyrolysis furnace and pyrolysis outlet of still cyclone separator, fixed bed Top is connect with furnace exit cyclone separator on the left of pyrolysis oven, connects fluid-bed combustion furnace by feed back leg below left side; Fixed-bed pyrolysis furnace roof portion connect with pyrolysis outlet of still cyclone separator and communicates;
The synthesis gas processing system includes electronics oil expeller and pressuring machine, and pyrolysis outlet of still cyclone separator connects electronics Oil expeller, electronics oil expeller top connect pressuring machine, and pressuring machine is connected with the gas nozzle of fluid-bed combustion furnace;Electronics oil expeller Lower section is equipped with tar outlet, and tar outlet is connected to combustion furnace screw(-type) feeder.
Preferably, the fixed bed refuse pyrolysis system further includes Coke crusher and pyrolysis oven screw(-type) feeder;It is fixed Top is equipped with garbage feeding mouth on the right side of bed pyrolysis oven, is connected with pyrolysis oven screw(-type) feeder;Under on the left of the fixed-bed pyrolysis furnace Side is equipped with coke discharge port, is connected with Coke crusher, Coke crusher is connected with feed back leg;Fixed-bed pyrolysis furnace bottom is set There is gasification agent inlet.
Preferably, the pyrolysis outlet of still cyclone separator is divided into two-way by flow control valve, is connected and fixed all the way The gasification agent inlet of bed pyrolysis furnace bottom, the electronics oil expeller of another way connection synthesis gas processing system.
Preferably, in the fixed bed refuse pyrolysis system, pass through coke from the rubbish coke of fixed-bed pyrolysis furnace discharge After crusher, rubbish coke particle diameter is less than 30mm.
Second technical solution of the invention is: a kind of electricity-generating method of coal-fired coupling domestic garbage pyrolysis, including following Step:
1) coal dust is fed by combustion furnace screw(-type) feeder from the coal dust material inlet of fluid-bed combustion furnace, in the oxygen of fluidized gas Change effect is lower to occur combustion reaction, and the flue gas of generation of burning enters furnace exit cyclone separator entrainment of taking hott bed material, Gas solid separation under the action of centrifugal force takes hott bed material by material returning device and falls into fixed-bed pyrolysis furnace, and flue gas then enters fume treatment System;
2) dry broken house refuse top charging on the right side of fixed-bed pyrolysis furnace by pyrolysis oven screw(-type) feeder Afterwards, with take hott bed material pyrolysis furnace bottom carry out contact heat transfer, occur devolatilization reaction and pyrolysis reduction reaction;Pyrolysis generates Rubbish coke be discharged into crusher, enter fluid-bed combustion furnace by feed back leg after broken and coal dust mix burning;Pyrolysis generate with CO2、CO、H2、H2O and CH4Based on crude synthesis gas then enter pyrolysis oven cyclone separator, isolate and enter synthesis gas after lime-ash Processing system, the synthesis gas temperature for being pyrolyzed outlet of still is about 500 DEG C~700 DEG C;
3) entering the rubbish coke of fluid-bed combustion furnace from feed back leg and coal dust is sufficiently mixed burning, fixed carbon is converted, The clinker that coke and coal generate is discharged from the lower cinder notch of fluid-bed combustion furnace;Burning generate heat be used to produce steam with for Heat or power generation;
4) after from the crude synthesis gas that pyrolysis oven cyclone separator comes out by flow control valve distribution regulation, part is returned Fixed-bed pyrolysis furnace promotes newly generated synthesis gas discharge fixed-bed pyrolysis furnace, another part for providing pyrolysis atmosphere Tar removing is removed by electronics oil expeller, obtained combustible gas is passed through after pressuring machine compression pressurization and conveys pressurization to fixed-bed pyrolysis furnace Combustion gas.
Preferably, the hott bed material temperature degree of taking that fixed-bed pyrolysis furnace is fallen into the step 1) reaches 850 DEG C.
Preferably, the house refuse in the step 2) is sent into fixed-bed pyrolysis furnace after the pretreatments such as broken drying Garbage raw material moisture content less than 20%.
Preferably, the tar obtained in step 4) from electronics oil expeller is delivered to the coal dust feed inlet of fluid-bed combustion furnace, Oxidizing fire is carried out into combustion furnace.
Compared with prior art, beneficial effects of the present invention are as follows:
(1) present invention takes full advantage of existing coal-fired plant boiler and its fume treatment auxiliary, only needs based on this Common fixed-bed pyrolysis furnace is coupled, a large amount of capital investment is reduced.
(2) coal dust multifuel combustion rubbish coke delivers equipment at full capacity by the present invention, and makes boiler by mixing burning synthesis gas The thermal efficiency improves, and efficiently disposes house refuse while reducing consumption coal.
(3) double bed of circulating fluidized bed combustion of the present invention and fixed-bed pyrolysis process designs, using bed material as heat carrier, two It is recycled between burner hearth, solves the problems, such as the benefit again of the heat source input of the fixed-bed pyrolysis gasification endothermic reaction and single pyrolysis coke With problem, while by control bed material internal circulating load, achievees the purpose that accurately control pyrolysis in-furnace temperature, ensure that holding for system Continuous stable operation.
(4) rubbish is carried out pyrolytic gasification by the present invention under reductive condition, and smoke discharge amount is small, and dust entrainment is few, and The generation of SOx, NOx and HCl also will receive certain restrictions under reducing atmosphere, while lower air equivalent is than inhibiting dioxin Generation, rubbish is greatly reduced and directly burns bring secondary environmental pollution.
Detailed description of the invention
It is described in further detail below in conjunction with attached drawing and embodiments of the present invention
Fig. 1 is system structure diagram of the invention.
In the figure, it is marked as 1. fluid-bed combustion furnaces, 2. fixed-bed pyrolysis furnaces, 3. furnace exit cyclone separators, 4. times Dipleg, 5. Coke crushers, 6. pyrolysis outlet of still cyclone separators, 7. electronics oil expellers, 8. pressuring machines, 9. combustion furnace spirals are given Material machine, 10. pyrolysis oven screw(-type) feeders, 11. flow control valves, 12. material returning devices, a. house refuse, b. coal dust, c. rubbish are burnt Charcoal, d. combustible gas, e. tar, f. steam, g. flue gas, h. gasifying agent, i. fluidized bed clinker, j. lime-ash, k. fluidized gas.
Specific embodiment
Referring to attached drawing.The present embodiment includes at circulating fluidized bed combustion coal system, fixed bed refuse pyrolysis system and synthesis gas Reason system.Wherein, coal burning system designs the HG-480/13.7L.MG31 type circulating fluidized bed boiler based on power 135MW, pyrolysis System design is based on fixture bed experiment data.
The circulating fluidized bed combustion coal system includes: fluid-bed combustion furnace 1, furnace exit cyclone separator 3, feed back Leg 4 and combustion furnace screw(-type) feeder 9;It is equipped with coal dust material inlet in the burner hearth left wall face lower part of fluid-bed combustion furnace 1, with combustion furnace Screw(-type) feeder 9 connects, and burner hearth right wall lower part is connect with feed back leg 4;1 bottom of fluid-bed combustion furnace is equipped with lower cinder notch, fluidisation Gas k is passed through burner hearth from bottom by the air distribution plate right above lower cinder notch;The outlet at 1 top of fluid-bed combustion furnace and furnace exit The connection of cyclone separator 3 communicates.
The fixed bed refuse pyrolysis system includes: fixed-bed pyrolysis furnace 2, pyrolysis outlet of still cyclone separator 6, coke Crusher 5 and pyrolysis oven screw(-type) feeder 10;It is equipped with garbage feeding mouth on the burner hearth right wall top of fixed-bed pyrolysis furnace, with heat Furnace screw(-type) feeder 10 is solved to connect;Left wall face top is connect with furnace exit cyclone separator 3, and the coke of left wall face lower part goes out Material mouth is connect with Coke crusher 5;It is pyrolyzed the entrance that furnace bottom is equipped with gasifying agent h, the outlet of roof of the furnace and pyrolysis outlet of still The connection of cyclone separator 6 communicates.
The synthesis gas processing system includes: electronics oil expeller 7 and pressuring machine 8.Pyrolysis oven synthesis gas goes out through pyrolysis oven Mouth cyclone separator gas 6 after separation, into electronics oil expeller 7, obtains tar, combustible gas blasts pressuring machine 8 admittedly.The circulation Fluidized bed coal system installs 4~8 groups of gas nozzles on the burner hearth of fluid-bed combustion furnace 1, and sending out from pressuring machine 8 has one The combustion gas of constant-pressure is sprayed to burner hearth.
In the present embodiment, coal dust b enters fluid-bed combustion furnace 1 from the feed of combustion furnace screw(-type) feeder 9, the life after drying Rubbish a enters fixed-bed pyrolysis furnace 2 from the feed of pyrolysis oven screw(-type) feeder 10;From the rubbish coke c of furnace discharge is pyrolyzed through overfocus After charcoal crusher 5, partial size becomes smaller, and mechanical strength reduces, and is easy to mix burning with coal dust;It is sent into the rubbish of fluid-bed combustion furnace after crushing Rubbish coke particle diameter is less than 30mm.
Concrete operations the following steps are included:
Step 1): the qualified coal dust b of primary screening reaches 7mm hereinafter, by combustion furnace spiral using broken rear partial size Batcher 10 is fed from the coal dust material inlet on 1 left wall face top of fluid-bed combustion furnace, while partial size≤1mm bed is covered in burner hearth Expect sand.
Step 2): the air that temperature is about 200 DEG C is passed through fluidized bed combustion by the air distribution plate of 1 bottom of fluid-bed combustion furnace Furnace.Under the oxidation of fluidized gas k combustion reaction occurs for coal dust b after combustion-supporting oil drop fire, the flue gas g of generation of burning entrainment of It takes hott bed material and enters furnace exit cyclone separator 3, under the influence of centrifugal force gas solid separation, take hott bed material particle by returning Glassware 12 falls into fixed-bed pyrolysis furnace 2, and flue gas g then enters smoke processing system.
Step 3): furnace design bed temperature is 890 DEG C, and actual motion bed temperature maintains 800 DEG C~920 DEG C or so, burner hearth Exit gas temperature design temperature reaches 890 DEG C;Furnace exit cyclone separator 3 uses heat preservation, fire resisting and wear-resisting material, To reduce heat waste, the hott bed material particle temperature of taking for falling into fixed-bed pyrolysis furnace 2 is made to reach 850 DEG C or so.Increase bed material amount, improves The internal circulating load of material can reduce bed temperature.Increase bed drain purge, bed drops, inventory is reduced, and bed temperature can be made to increase.
Step 4): the house refuse a of (crude waste is crushed after sieving magnetic separation) passes through pyrolysis oven screw feeder after pretreatment Machine 10 enters fixed-bed pyrolysis furnace 2 from the material inlet above pyrolysis oven right wall.House refuse a and take hott bed material fixed bed heat Contact heat transfer in furnace 2 is solved, and devolatilization reaction and pyrolysis reduction reaction occurs.It is sent into the house refuse a of fixed-bed pyrolysis furnace 2 Moisture content is less than 20%.
Step 5): the rubbish coke c for being pyrolyzed generation is discharged into Coke crusher 5, enters fluidized bed by feed back leg 4 after being crushed Combustion furnace 1 and coal dust b mix burning.The rubbish coke c partial size for being sent into fluid-bed combustion furnace after crushing is less than 30mm.What pyrolysis generated With CO2、CO、H2、H2O and CH4Based on crude synthesis gas then enter pyrolysis oven cyclone separator 6, isolate to enter after lime-ash j and close At gas processing system.
Step 6): after the crude synthesis gas come out from pyrolysis oven cyclone separator 6 is by the distribution regulation of flow control valve 11, Part returns to fixed-bed pyrolysis furnace 2 as gasifying agent h for providing pyrolysis atmosphere, while promoting newly generated synthesis gas discharge solid Fixed bed pyrolysis oven 2, another part remove tar removing e by electronics oil expeller 7, and obtained combustible gas d is passed through the compression pressurization of pressuring machine 8 The backward conveying of fluid-bed combustion furnace 1 pressurization combustion gas.The feed inlet that obtained tar e is delivered to fluid-bed combustion furnace enters burning Furnace, coal dust b mixes burning together with rubbish coke c, combustible gas d and tar e and generates steam, to heat supply or power generation.
Step 7): regulated and controled by controlling the bed material amount for falling into fixed-bed pyrolysis furnace 2 and the feeding coal ratio of house refuse a The temperature of fixed-bed pyrolysis furnace 2 controls 2 bed temperature of fixed-bed pyrolysis furnace and outlet syngas temperatures at 500 DEG C~700 DEG C.Table 1 Based on experimental data, the product property to gasify to refuse pyrolysis under different temperatures is analyzed, and can be mentioned for the control of pyrolysis oven bed temperature For reference.
Product distribution and characteristic under the conditions of the different pyrolysis temperatures of table 1.

Claims (8)

1. a kind of electricity generation system of coal-fired coupling domestic garbage pyrolysis, it is characterised in that: include:
For rubbish coke and coal dust to be mixed burning, steam is generated with the circulating fluidized bed combustion coal system of heat supply or power generation;
For converting the house refuse after drying to the fixed bed refuse pyrolysis system of coke and synthesis gas;
For isolating synthesis gas cooling and purifying tar and obtaining the synthesis gas processing system of combustible gas;
The circulating fluidized bed combustion coal system includes fluid-bed combustion furnace, furnace exit cyclone separator, feed back leg and burning Furnace screw(-type) feeder, fluid-bed combustion furnace left side lower section are equipped with coal dust material inlet, are connected with combustion furnace screw(-type) feeder;Fluidized bed Outlet at the top of combustion furnace is connect with furnace exit cyclone separator to be communicated;The burner hearth of the fluid-bed combustion furnace is equipped with 4 ~8 groups of gas nozzles;The fluid-bed combustion furnace lower right-hand side is connected with feed back leg;Fluidized bed combustion furnace bottom is equipped with slag Mouthful;
The fixed bed refuse pyrolysis system includes fixed-bed pyrolysis furnace and pyrolysis outlet of still cyclone separator, fixed-bed pyrolysis Top is connect with furnace exit cyclone separator on the left of furnace, connects fluid-bed combustion furnace by feed back leg below left side;It is described Fixed-bed pyrolysis furnace roof portion connect with pyrolysis outlet of still cyclone separator and communicates;
The synthesis gas processing system includes electronics oil expeller and pressuring machine, and pyrolysis outlet of still cyclone separator connects electronics oil removing Device, electronics oil expeller top connect pressuring machine, and pressuring machine is connected with the gas nozzle of fluid-bed combustion furnace;Below electronics oil expeller Equipped with tar outlet, tar outlet is connected to combustion furnace screw(-type) feeder.
2. a kind of electricity generation system of coal-fired coupling domestic garbage pyrolysis as described in claim 1, it is characterised in that: the fixation Bed refuse pyrolysis system further includes Coke crusher and pyrolysis oven screw(-type) feeder;Top is equipped with rubbish on the right side of fixed-bed pyrolysis furnace Material inlet is connected with pyrolysis oven screw(-type) feeder;Lower section is equipped with coke discharge port on the left of the fixed-bed pyrolysis furnace, broken with coke Broken machine is connected, and Coke crusher is connected with feed back leg;Fixed-bed pyrolysis furnace bottom is equipped with gasification agent inlet.
3. a kind of electricity generation system of coal-fired coupling domestic garbage pyrolysis as claimed in claim 2, it is characterised in that: the pyrolysis Outlet of still cyclone separator is divided into two-way by flow control valve, and the gasifying agent for being connected and fixed bed pyrolysis furnace bottom all the way enters Mouthful, the electronics oil expeller of another way connection synthesis gas processing system.
4. a kind of electricity generation system of coal-fired coupling domestic garbage pyrolysis as described in claim 1, it is characterised in that: the fixation In bed refuse pyrolysis system, from the rubbish coke of fixed-bed pyrolysis furnace discharge after Coke crusher, rubbish coke particle diameter is small In 30mm.
5. a kind of electricity-generating method of electricity generation system described in claim 1, it is characterised in that: the following steps are included:
1) coal dust is fed by combustion furnace screw(-type) feeder from the coal dust material inlet of fluid-bed combustion furnace, is made in the oxidation of fluidized gas With lower generation combustion reaction, the flue gas for generation of burning enters furnace exit cyclone separator entrainment of hott bed material is taken, and is being centrifuged Gas solid separation under the action of power takes hott bed material by material returning device and falls into fixed-bed pyrolysis furnace, and flue gas then enters smoke processing system;
2) after dry broken house refuse is fed by pyrolysis oven screw(-type) feeder from fixed-bed pyrolysis furnace right side top, with It takes hott bed material and carries out contact heat transfer in pyrolysis furnace bottom, devolatilization reaction and pyrolysis reduction reaction occurs;It is pyrolyzed the rubbish generated Rubbish coke is discharged into crusher, enters fluid-bed combustion furnace by feed back leg after broken and coal dust mixes burning;Pyrolysis generate with CO2、 CO、H2、H2O and CH4Based on crude synthesis gas then enter pyrolysis oven cyclone separator, isolate and enter synthesis gas after lime-ash and handle System, the synthesis gas temperature for being pyrolyzed outlet of still is about 500 DEG C~700 DEG C;
3) enter the rubbish coke of fluid-bed combustion furnace from feed back leg and coal dust is sufficiently mixed burning, fixed carbon is converted, coke The clinker generated with coal is discharged from the lower cinder notch of fluid-bed combustion furnace;The heat that burning generates be used to produce steam to heat supply or Power generation;
4) after from the crude synthesis gas that pyrolysis oven cyclone separator comes out by flow control valve distribution regulation, part, which returns, to be fixed Bed pyrolysis oven promotes newly generated synthesis gas discharge fixed-bed pyrolysis furnace for providing pyrolysis atmosphere, and another part passes through Electronics oil expeller removes tar removing, and obtained combustible gas is passed through after pressuring machine compression pressurization and conveys pressurization combustion to fixed-bed pyrolysis furnace Gas.
6. electricity-generating method as claimed in claim 5, it is characterised in that: fall into fixed-bed pyrolysis furnace in the step 1) takes heat Bed material temperature reaches 850 DEG C.
7. electricity-generating method as claimed in claim 5, it is characterised in that: the house refuse in the step 2) is by broken drying After pretreatment, the garbage raw material moisture content of fixed-bed pyrolysis furnace is sent into less than 20%.
8. electricity-generating method as claimed in claim 5, it is characterised in that: the tar obtained in step 4) from electronics oil expeller, it is defeated It send to the coal dust feed inlet of fluid-bed combustion furnace, carries out oxidizing fire into combustion furnace.
CN201811516366.9A 2018-12-12 2018-12-12 A kind of electricity generation system and method for coal-fired coupling domestic garbage pyrolysis Pending CN109385309A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111457388A (en) * 2020-04-07 2020-07-28 西安交通大学 System and method for co-burning solid hazardous waste and reducing dioxin discharge of chain furnace

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111457388A (en) * 2020-04-07 2020-07-28 西安交通大学 System and method for co-burning solid hazardous waste and reducing dioxin discharge of chain furnace
CN111457388B (en) * 2020-04-07 2022-02-18 西安交通大学 System and method for co-burning solid hazardous waste and reducing dioxin discharge of chain furnace

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