CN108421806A - A kind of refuse gasification cogeneration system with flue gas recirculation - Google Patents
A kind of refuse gasification cogeneration system with flue gas recirculation Download PDFInfo
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- 238000002309 gasification Methods 0.000 title claims abstract description 132
- 239000003546 flue gas Substances 0.000 title claims abstract description 69
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000007789 gas Substances 0.000 claims abstract description 165
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 95
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 95
- 239000010813 municipal solid waste Substances 0.000 claims abstract description 56
- 239000002699 waste material Substances 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 238000004140 cleaning Methods 0.000 claims abstract description 33
- 238000012545 processing Methods 0.000 claims abstract description 27
- 230000005611 electricity Effects 0.000 claims abstract description 17
- 239000003818 cinder Substances 0.000 claims abstract description 14
- 238000005325 percolation Methods 0.000 claims abstract description 14
- 238000010248 power generation Methods 0.000 claims abstract description 13
- 239000000779 smoke Substances 0.000 claims abstract description 11
- 238000000746 purification Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 239000000463 material Substances 0.000 claims description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 28
- 239000001301 oxygen Substances 0.000 claims description 28
- 229910052760 oxygen Inorganic materials 0.000 claims description 28
- 239000002918 waste heat Substances 0.000 claims description 24
- 238000005201 scrubbing Methods 0.000 claims description 15
- 239000003054 catalyst Substances 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 11
- 238000001704 evaporation Methods 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 10
- 230000003197 catalytic effect Effects 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 230000008020 evaporation Effects 0.000 claims description 9
- 239000000149 chemical water pollutant Substances 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 7
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 239000012141 concentrate Substances 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000005373 pervaporation Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 18
- 239000002956 ash Substances 0.000 description 33
- 230000008569 process Effects 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 9
- 229910001385 heavy metal Inorganic materials 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 6
- 238000004056 waste incineration Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000007233 catalytic pyrolysis Methods 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000013618 particulate matter Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- WURBVZBTWMNKQT-UHFFFAOYSA-N 1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)butan-2-one Chemical compound C1=NC=NN1C(C(=O)C(C)(C)C)OC1=CC=C(Cl)C=C1 WURBVZBTWMNKQT-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000004523 catalytic cracking Methods 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006298 dechlorination reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011026 diafiltration Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/02—Gases or liquids enclosed in discarded articles, e.g. aerosol cans or cooling systems of refrigerators
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kind of refuse gasification cogeneration system with flue gas recirculation, including crude waste pretreatment system, the crude waste feed bin of crude waste pretreatment system divides two-way, it is connect all the way with garbage percolation liquid treating system, another way is connect by dry sieve sub-module with the gasification furnace of refuse gasification synthesis system, and garbage percolation liquid treating system and refuse gasification synthesis system are connect with cinder processing system；Refuse gasification synthesis system is also connect by synthetic gas cleaning system with the synthesis gas heat exchanger of synthesis gas afterheat utilizing system, synthetic gas cleaning system is connect by synthesis gas electricity generation system with gas cleaning and residual heat system, for realizing refuse gasification cogeneration, gas cleaning and residual heat system connect with gasification furnace by smoke circulating system and realize flue gas recirculation.Refuse gasification technique, gasification synthesis gas purification technique are optimized, the final requirement for realizing refuse gasification power generation, heat supply；Also improve the efficiency of energy utilization of system entirety.
Description
Technical field
The invention belongs to garbage decrement, innoxious process for treating fields, and in particular to a kind of rubbish with flue gas recirculation
Gasify cogeneration system.
Background technology
Current China refuse collection total amount is about 1.79 hundred million tons/year, and due to treatment technology low SI, a large amount of rubbish are only
It is transported to city suburbs or the combination area of city and country arbitrarily to stack or simply fill, " garbage-surrounded city " phenomenon getting worse restricts
The modernization and Development of Urbanization in China.
Sanitary landfill method and stacking are the main processing ways of current China's rubbish, account for China's garbage disposal total amount
88%, but both methods had not only been not carried out " innoxious " of rubbish, but also do not accomplish " recycling " and " minimizing ".Just at present
Research from the point of view of, be that more suitable current ordinary municipal house refuse is ultimate using garbage incineration technology as the heat utilization mode of representative
Treatment technology, but the technology still has some technical barriers, constrains its development, summing up mainly has the following：
1) refuse thermal value is relatively low, it is difficult to meet incinerator demand
Burning method handles house refuse, needs the calorific value of rubbish higher (about 5000kJ/kg or more), moisture content is relatively low.
Combustible component in the rubbish of developed country is higher, and moisture content is 10% hereinafter, so rubbish ignition is all relatively easy to.And
China's rubbish totality moisture content is high, and for Shelter in South China Cities msw water content usually 40% to 50% or so, which increases rubbish to burn
The difficulty for burning stove operation needs to add the stable operation that auxiliary fuel (such as coal, heavy oil) just can guarantee waste incinerator.
2) burning method handles house refuse, easily brings secondary pollution
Due to the diversity of component of refuse, mutability, the complexity etc. of burning process influence factor, at this stage waste incineration
The technology inevitably easy secondary pollutions such as bioxin, heavy metal caused by environment so that many waste incineration projects push away
Into being obstructed.
1. waste incineration generates bioxin pollution：
In current conventional Refuse Incineration Process, bioxin is mainly generated by two kinds of approach：One is having containing chlorine
Machine object generates bioxin by imperfect combustion；Another kind is to generate two by heavy metal catalyst in tail gas cooling stage flue gas containing chlorine
Evil English.Since component of refuse is complicated and changeable, it is insufficient to be easy to cause burning, and the higher , bioxin of content of Cl element in rubbish
It can largely be generated by the first approach in the process；Even at very high temperatures, burning carries out for combustion reaction control
It is very complete, due to there are a large amount of heavy metal element , bioxin in rubbish still can be by the catalytic action of heavy metal in tail
Portion's flue is generated again by second of approach.Bioxin cannot achieve on-line monitoring to Er at present, not remove means efficiently,
It is typically only capable to that the means such as Quench and activated carbon adsorption is taken to be handled, it is very high to handle cost up to standard, largely effects on garbage power
Economic benefit, or even can cause to lose, this main reason for namely Refuse Incineration Process Zhong bioxin problem is difficult to overcome.
2. waste incineration generates heavy metal pollution：
Since current China's garbage classification is not thorough, so the ingredient of China's heavy metals in garbage is higher, and waste incineration
In the process, heavy metal volatile in rubbish can be as in flue gas and fly ash emission to air, not volatile heavy metal then exists
Largely exist in waste incineration bottom ash.Incineration of refuse flyash belongs to danger wastes, wherein containing the weight such as a large amount of Pb, Cr, Cd
Metallic element has very strong harm to environment, it is necessary to properly be handled, generally use cement solidification at present is changed
The methods of pickling is learned, cost is higher, and processing is not thorough.
Therefore, the conventional spams treatment technology such as sanitary landfills, burning has inevitable technical disadvantages, it is therefore desirable to seek
Look for a kind of more advanced rubbish processing to be harmless technology.Using domestic garbage gasification as the thermochemical study Land use systems of representative,
It is the treatment technology that comparison is suitble to house refuse.For China's rubbish feature, establishes and rubbish may be implemented suitable for China's rubbish
Rubbish recycling, innoxious, minimizing processing gasification system are the effective ways handled rubbish.
In addition to this, a large amount of CO are contained in flue gas2, and fixed carbon is in CO in crude waste component2In the presence of can send out
Raw gasification reaction, generates a large amount of CO, can effectively improve synthesis gas quality.In addition to this, exhaust gas temperature is higher, passes through flue gas recirculation
Using the low temperature exhaust heat that can be efficiently used in smoke evacuation, the efficiency of energy utilization of system is improved.Therefore, one kind is established to follow with flue gas
The refuse gasification cogeneration system of ring has great importance.
Invention content
It is followed in view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of band flue gas
The refuse gasification cogeneration system of ring develops the crude waste of effective cleaning by effectively combining China's rubbish feature
Pretreatment system；And a series of high requests of the gas turbine to the high heating value of combustion gas, low tar, low-metal content are combined, it is right
Refuse gasification technique is optimized, and also the purification technique of gasification synthesis gas is optimized, the synthesis gas after optimizing can
Meet the combustion requirements of gas turbine, may finally realize the requirement of refuse gasification power generation, heat supply；The system is also to low-temperature flue gas
It is recycled, not only increases the quality of synthesis gas, while also improving the efficiency of energy utilization of system entirety.
The present invention uses following technical scheme：
A kind of refuse gasification cogeneration system with flue gas recirculation, including crude waste pretreatment system, crude waste
The crude waste feed bin of pretreatment system divides two-way, is connect all the way with garbage percolation liquid treating system, and another way passes through dry sieve
Sub-module is connect with the gasification furnace of refuse gasification synthesis system, garbage percolation liquid treating system and refuse gasification synthesis system with
Cinder processing system connects；Refuse gasification synthesis system also passes through synthetic gas cleaning system and synthesis gas afterheat utilizing system
The connection of synthesis gas heat exchanger, synthetic gas cleaning system connect by synthesis gas electricity generation system with gas cleaning and residual heat system,
For realizing refuse gasification cogeneration, gas cleaning and residual heat system connect with gasification furnace by smoke circulating system and realize cigarette
Gas recycles.
Specifically, crude waste feed bin passes through material conveyor, broken water squeezing module and dry sieve sub-module and gas successively
Change the connection of stove entrance, the rubbish in crude waste feed bin is sent by material conveyor to broken water squeezing module, through being crushed water squeezing module
Enter in gasification furnace by dry screening module after processing, broken water squeezing module is also connect with garbage percolation liquid treating system.
Further, garbage percolation liquid treating system includes percolate reservoir, one end of percolate reservoir respectively with
The high-temperature ash sifter connection of crude waste feed bin, broken water squeezing module and cinder processing system, gasify outlet of still
The high-temperature ash of discharge is evaporated concentration after the screening of high-temperature ash sifter to the percolate in percolate reservoir；
The other end of percolate reservoir divides two-way, is connect all the way with RO modules through pervaporation liquid reservoir, another way according to
The secondary gasification furnace bed material storage tank by lime-ash reservoir, cinder processing system is connect with gasification outlet of still, and evaporation liquid enters
Liquid reservoir is evaporated, the lime-ash of lime-ash reservoir is for adsorbing concentrate, and the lime-ash after adsorbing is as gasification siege
Material enters gasification furnace bed material storage tank, for bed material needed for gasification furnace.
Further, the outlet of gasification furnace is connect through high-temperature ash sifter with landfill yard, and landfill yard is also sieved with dry
Module connects.
Specifically, synthetic gas cleaning system includes filter, the entrance of filter is connect with gasification outlet of still, filter
Catalytic bed is passed through in outlet successively, synthesis gas heat exchanger is connect with scrubbing tower, and cleaning solution, scrubbing tower outlet point are provided in scrubbing tower
Two-way is connect with synthesis gas electricity generation system all the way, and another way is connect with devil liquor recovery module for being recycled by waste liquid pool.
Further, refuse gasification synthesis system includes oxygen-enriched air blast machine, water and low-temperature flue gas recycle gas blower, oxygen-enriched drum
Wind turbine and water are connected by the entrance of synthesis gas heat exchanger and gasification furnace, and low-temperature flue gas recycle gas blower passes through synthesis gas heat exchanger
It is connect with dry sieve sub-module.
Further, synthesis gas heat exchanger includes high temperature section, middle-temperature section and low-temperature zone, and high temperature section connects with oxygen-enriched air blast machine
It connects, middle-temperature section is connect with water, and low-temperature zone is connect with low-temperature flue gas recycle gas blower.
Specifically, synthesis gas electricity generation system includes being provided with the gas turbine of air blower, the entrance of gas turbine and synthesis
The scrubbing tower of gas purification system connects, and synthesis gas enters gas turbine for combustion power generation, and flue gas is passed through in the outlet of gas turbine
Purification and residual heat system are connect with smoke circulating system.
Further, gas cleaning and residual heat system include SCR modules, are provided with oxygen in SCR modules Ji bioxin is urged
Agent and NOxOne end of selective reduction catalyst, SCR modules is connect with gas turbine, is generated for that will pass through gas turbine
High-temperature flue gas be sent into SCR modules in, the other end by waste heat boiler for generate electricity or domestic water, waste heat boiler divide two-way,
It is connect all the way with chimney, another way connect realization with low-temperature flue gas recycle gas blower and recycles.
Specifically, gasification furnace includes fixed-bed gasification furnace or fluidized-bed gasification furnace, gasifying medium is vapor, oxygen-enriched or rich
Oxygen is provided with desulfurization antichlor in gasification furnace.
Compared with prior art, the present invention at least has the advantages that：
A kind of refuse gasification cogeneration system with flue gas recirculation of the present invention, in crude waste pretreatment system, warp
Rational arrangement is crossed, is effectively utilized the high-temperature residual heat of synthesis gas generation, while carrying out to the foul smell that dry sieve sub-module generates
Harmless treatment；In penetrating fluid treatment system, not only the waste heat of gasification furnace high temperature deslagging is utilized, while also right
With water quality, complicated, harmfulness is greatly, CODCr and BOD5 concentration is high, tenor is high, ammonia-nitrogen content is high, salt content is high, coloration depth
And the landfill leachate of the features such as foul smelling is evaporated concentration, the landfill leachate after concentrating passes through the furnace slag discharge that gasifies
After absorption, it is again introduced into gasification furnace as bed material, realizes harmless treatment；In cinder processing system, efficiently use
The waste heat of high-temperature ash, while the adsorption activity of lime-ash is also used, it realizes innoxious, the recycling of lime-ash, leads to
Cross the CO that smoke circulating system is effectively utilized in smoke discharging2And waste heat, improve the using energy source of synthesis gas quality and system
Efficiency.
Further, the percolate of percolate reservoir can derive from crude waste feed bin and broken water squeezing mould in the system
Block, while the high-temperature ash of gasification furnace is by after high-temperature ash sifter, the larger high-temperature ash particle of grain size enters diafiltration
Part cleaning evaporation water can be obtained in liquid reservoir, evaporation section refuse leachate, while inside also absorbable refuse leachate
The hazardous substances such as organic matter, the lime-ash after Adsorption Concentration percolate are introduced into lime-ash reservoir, entering back into siege material storage tank,
Finally enter gasification furnace as bed material, inside gasification furnace, these organic matters after being adsorbed pass through high temperature thermochemical study
Harmless treatment is realized in effect；And part landfill leachate also not to be adsorbed can enter and evaporate liquid reservoir, finally enter RO
Module realizes harmless treatment.
Further, the high-temperature ash of gasification furnace is by after high-temperature ash sifter, the smaller high-temperature ash of grain size is straight
It taps into and is filled into landfill yard, finally realize harmless treatment.
Further, high-temperature synthesis gas is exchanged heat by heat exchanger, for the step profit for realizing to synthesis gas high temperature heat
With the heat exchanger of the system is divided into high temperature section, middle-temperature section and low-temperature zone；Due to it is oxygen-enriched be gasifying medium, so when oxygen-enriched temperature
Higher, the oxygen-enriched heat absorbed from gasification furnace is fewer, and gasification result is more preferable；Liquid water forms vapor later by middle-temperature section,
Same vapor is also the gasifying medium of gasification furnace, when the temperature of vapor is higher, it is meant that vapor is absorbed from gasification furnace
Heat is fewer, and gasification result is more preferable；Since drying air temperature is unsuitable excessively high, if drying air temperature is too high, rubbish will be caused
Pyrolytic reaction occurs, discharges volatile matter, influences synthesis gas quality, therefore the system selects heat source of the low-temperature zone as dry air.
Further, in purified synthesis gas and afterheat utilizing system, the low temperature after purified processing, clean synthesis
Gas can be directly entered gas turbine and carry out combustion power generation；In synthesis gas electricity generation system and gas cleaning and afterheat utilizing system,
And pass through the high-temperature flue gas that gas turbine generates, into catalytic pyrolysis bioxin and Reduction of NOxSCR modules, most
Enter waste heat boiler afterwards, realizes heat, electricity supply, flue gas harmless treatment and the UTILIZATION OF VESIDUAL HEAT IN of system.
Further, synthetic gas cleaning system is for solid particulate matter filtering, catalytic cracking of tar, high-temperature synthesis gas waste heat
Using and synthesis gas washing handle, low temperature after purified processing, clean synthesis gas can be directly entered gas turbine progress
Combustion power generation, and pass through the high-temperature flue gas that gas turbine generates, into waste heat boiler.If the high-temperature steam that waste heat boiler generates
Meet steam turbine requirement, then carry out steam turbine power generation, the steam that ungratified steam turbine power generation requires can be used for domestic water, to real
Heat, the electricity supply of existing system.
Further, in refuse gasification system, gasifying medium used in gasification furnace be oxygen-enriched, vapor and circulating flue gas,
The calorific value for effectively improving synthesis gas can also effectively inhibit the generation of bioxin since vapor is reducibility gas, and from
It is rich in CO after waste heat boiler utilization2Flue gas by in rubbish fixed carbon occur gasification reaction, can equally increase
Synthesis gas quality, while desulfurization antichlor has been put into gasification furnace, it can effectively control sulfide, chloride in synthesis gas.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Description of the drawings
Fig. 1 is present system schematic diagram.
Wherein：1. transport vehicle；2. crude waste feed bin；3. material conveyor；4. broken water squeezing module；5. drying screening mould
Block；6. gasification furnace；7. desulfurization antichlor；8. filter；9. catalytic bed；10. synthesis gas heat exchanger；11. scrubbing tower；12. combustion gas
Turbine；13.SCR modules；14. chimney；15. percolate reservoir；16. evaporating liquid reservoir；17. lime-ash reservoir；18. gasification
Siege material storage tank；19. high-temperature ash sifter；20. landfill yard；21. oxygen-enriched air blast machine；22. cleaning solution；23. water；24. low temperature
Flue gas recirculation air blower；25. waste liquid pool；26. air blower；27. devil liquor recovery module；28.RO modules；29. waste heat boiler；30.
Oxygen is Ji bioxin catalyst；31.NOxSelective reduction catalyst.
Specific implementation mode
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Referring to Fig. 1, the present invention provides a kind of refuse gasification cogeneration system with flue gas recirculation, including primary rubbish
Rubbish pretreatment system, garbage percolation liquid treating system, cinder processing system, refuse gasification system, synthetic gas cleaning system,
Synthesis gas afterheat utilizing system, synthesis gas electricity generation system, gas cleaning and afterheat utilizing system and smoke circulating system；
The crude waste feed bin 2 of crude waste pretreatment system divides two-way, is connect all the way with garbage percolation liquid treating system,
Another way is connect by dry sieve sub-module 5 with 6 entrance of gasification furnace of refuse gasification synthesis system, garbage percolation liquid treating system
It is connect with cinder processing system with refuse gasification synthesis system；Refuse gasification synthesis system also passes through purified synthesis gas system
System connect with the synthesis gas heat exchanger 10 of synthesis gas afterheat utilizing system, synthetic gas cleaning system pass through synthesis gas electricity generation system and
Gas cleaning and residual heat system connection, for realizing refuse gasification cogeneration, gas cleaning and residual heat system pass through synthesis gas
Heat exchanger 10 and dry sieve sub-module 5 are connect with gasification furnace 6 realizes flue gas recirculation.
Crude waste pretreatment system includes transport vehicle 1, crude waste feed bin 2, material conveyor 3, broken water squeezing module 4
With dry sieve sub-module 5, rubbish is transported in crude waste feed bin 2 by transport vehicle 1, and crude waste feed bin 2 passes through material successively
Conveyer 3, broken water squeezing module 4 are connect with dry sieve sub-module 5, are connect with 6 entrance of gasification furnace by dry sieve sub-module 5.
Garbage percolation liquid treating system include percolate reservoir 15, evaporation liquid reservoir 16, Adsorption Concentration percolate it
Lime-ash reservoir 17 afterwards, RO (biochemical treatment) module 28, one end of percolate reservoir 15 respectively with crude waste feed bin 2,
The high-temperature ash sifter 19 of broken water squeezing module 4 and cinder processing system connects, and the other end divides two-way, passes through all the way
Evaporation liquid reservoir 16 is connect with RO modules 28, and another way passes through the gasification furnace of lime-ash reservoir 17 and cinder processing system
Bed material storage tank 18 connects, and is connect with 6 entrance of gasification furnace by gasification furnace bed material storage tank 18.
Cinder processing system includes gasification furnace bed material storage tank 18, high-temperature ash sifter 19, landfill yard 20；Gasification furnace
6 outlets are connect by high-temperature ash sifter 19 with landfill yard 20.
Refuse gasification system includes gasification furnace 6, oxygen-enriched air blast machine 21, water 23, low-temperature flue gas recycle gas blower 24；Gasification furnace
Setting desulfurization antichlor 7 in 6, oxygen-enriched air blast machine 21, water 23 and dry air air blower 24 are distinguished by synthesis gas heat exchanger 10
It is connect with gasification furnace 6 and dry sieve sub-module 5；
Synthesis gas afterheat utilizing system includes synthesis gas heat exchanger 10, and synthesis gas heat exchanger 10 includes high temperature section, middle-temperature section
And low-temperature zone, one end of high temperature section are connect with oxygen-enriched air blast machine 21, the other end is connect with 6 entrance of gasification furnace, one end of middle-temperature section
It is connect with water 23, the other end is connect with 6 entrance of gasification furnace；One end of low-temperature zone is connect with dry air air blower 24, the other end
It is connect with 5 entrance of dry sieve sub-module.
Synthetic gas cleaning system includes filter 8, catalytic bed 9, synthesis gas heat exchanger 10, scrubbing tower 11, cleaning solution 22, gives up
Liquid pool 25, devil liquor recovery module composition 27,
The entrance of filter 8 is connected with the outlet of gasification furnace 6, and catalytic bed 9 is passed through in the outlet of filter 8 successively, synthesis gas changes
Hot device 10 is connect with scrubbing tower 11, is provided with cleaning solution 22 in scrubbing tower 11, and the outlet of scrubbing tower 11 divides two-way, all the way with synthesis gas
Electricity generation system connects, and another way is connect by waste liquid pool 25 with devil liquor recovery module 27.
Synthesis gas electricity generation system includes gas turbine 12, and air blower 26 is provided on gas turbine 12, and gas turbine 12 is logical
Cross the SCR modules 13 of the gas cleaning and residual heat system low-temperature flue gas recycle gas blower with chimney 14 and smoke circulating system respectively
24 connections.
Gas cleaning and residual heat system include waste heat boiler 29, SCR modules 13, oxygen Ji bioxin catalyst 30, NOxChoosing
Selecting property reducing catalyst 31 and chimney 14 are provided with oxygen Ji bioxin catalyst 30 and NO in SCR modules 13xSelective reduction
One end of catalyst 31, SCR modules 13 is connect with gas turbine 12, and the other end divides two-way by waste heat boiler 29, all the way with cigarette
Chimney 14 connects, and another way is connect with low-temperature flue gas recycle gas blower 24.
Smoke circulating system includes low-temperature flue gas recycle gas blower 24, and low-temperature flue gas recycle gas blower 24 is changed by synthesis gas
Hot device 10 is connect with dry sieve sub-module 5 (interface).
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being described and shown in usually here in attached drawing is real
Applying the component of example can be arranged and be designed by a variety of different configurations.Therefore, the present invention to providing in the accompanying drawings below
The detailed description of embodiment be not intended to limit the range of claimed invention, but be merely representative of the selected of the present invention
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
The course of work of crude waste pretreatment system is as follows：Crude waste is transported to crude waste feed bin by transport vehicle 1
2, then given to broken water squeezing module 4 by material conveyor 3, broken water squeezing module 4 does not limit precedence, can be according to actual conditions
Rationally adjusted；For example, when the water content of crude waste is higher, it can first carry out water squeezing processing and then carry out broken place
Reason, and when the water content of crude waste is relatively low, it can first carry out break process and then carry out water squeezing processing；
After broken water squeezing module 4, rubbish can enter dry sieve sub-module 5；Likewise, dry sieve sub-module 5 is not
Precedence is limited, can rationally be adjusted according to actual conditions；For example, the water content when rubbish is introduced into drying compared with Gao Shike
Screening process is entered back into later, if entering back into irradiation modules after screening module can be introduced into when rubbish water content is relatively low, if
When rubbish water content meets requirement of the gasification furnace to feeding water content, screening can be directly over and be put into gasification furnace later.
The garbage percolation liquid treating system course of work is as follows：The rubbish that crude waste feed bin 2 and broken-water squeezing module 4 generate
Rubbish percolate can enter percolate reservoir 15；Due to landfill leachate have water quality is complicated, harmfulness is big, CODCr and
BOD5 concentration is high, tenor is high, ammonia-nitrogen content is high, salt content is high, coloration depth and the features such as foul smelling, it is therefore desirable to its into
Row concentration harmless treatment.
The high-temperature ash of the discharge of gasification furnace 6 is screened to be later evaporated at concentration percolate in percolate reservoir 15
Reason；When landfill leachate evaporation process, water and part escaping gas are precipitated from percolate, and all heavy metals, inorganic salts
And most of organic matter can be retained in concentrate, the pollutants such as part volatile hydrocarbon, volatile organic acids and ammonia, which can enter, to be steamed
Gas, it is common to enter evaporation liquid reservoir 16, and be present in condensate liquid, finally enter RO processing modules 28；Percolate is by steaming
After hair processing, percolate can be concentrated into insufficient stoste volume 2%~10%；At this point, the lime-ash with suction-operated can be to dense
Contracting liquid is adsorbed, and the lime-ash after adsorbing enters gasification furnace bed material storage tank 18 as 6 bed material of gasification furnace, is eventually used for gasification furnace
Bed material needed for 6；To ensure that the harmless treatment of concentrate, the lime-ash after Adsorption Concentration percolate are arranged in gasification furnace 6
Layer bottom；Because being rich in NH in foul smell caused by dry sieve sub-module 53、H2The gases such as S and with pungent stink, be unsuitable for
It is directly discharged in air；
In addition, foul smell caused by dry sieve sub-module 5 has certain temperature, it is directly discharged in air, will causes big
Measure energy waste；To realize that the collaboration to foul smell is handled, high temperature foul smell can mix it with oxygen-enriched caused by dry sieve sub-module 5
Enter gasification furnace 6 afterwards；At this point, the waste heat of foul smell is not only utilized effectively, but also NH3、H2The gases such as S are because having reproducibility can
To the NO in flue gasXReduction catalysts are carried out, NO in flue gas is effectively reducedXDischarge.
The cinder processing system course of work is as follows：The high-temperature ash being discharged through gasification furnace 6 is after screening, part
Concentration is evaporated to landfill leachate into percolate reservoir 15, landfill yard 20 is partly directly entered and carries out at landfill
Reason；Adsorption treatment, the lime-ash conduct after having handled are carried out by the lime-ash after high temperature concentration, then to concentrated leachate
Bed material carries out gasification furnace bed material storage tank 18, is eventually used for the bed material needed for gasification furnace 6.
Refuse gasification system work process is as follows：Gasification furnace 6 described in the refuse gasification cogeneration system both may be used
Can also be fluidized-bed gasification furnace to be fixed-bed gasification furnace, required gasifying medium is vapor, oxygen-enriched and flue gas；It is steamed with water
Gas, oxygen-enriched, flue gas are gasifying medium, can be effectively increased the fuel gases calorific value of synthesis gas, meet heat of the gas turbine 12 to synthesis gas
Value demand；Vapor is reductant, can effectively reduce the generation of bioxin；Flue gas comes from after waste heat boiler utilization
Rich in CO2Flue gas；Gasifying medium can enter from 6 periphery of gasification furnace；6 temperature of gasification furnace can be carried out according to actual field situation
Rational choice；In order to effectively control the sulfide in synthesis gas, chloride, need to put into desulfurization dechlorination into gasification furnace 6 simultaneously
Agent 7.
The synthetic gas cleaning system course of work is as follows：High-temperature synthesis gas after the system comes out gasification furnace 6 carries out
Purified treatment, purification process specifically include：Solid particulate matter filtering, catalytic cracking of tar, high-temperature synthesis gas UTILIZATION OF VESIDUAL HEAT IN and conjunction
It is handled at gas washing；In order to not influence catalyst to the catalytic pyrolysis effect of tar, system is first to the solid in high-temperature synthesis gas
Particulate matter is filtered processing, and filter 8 need to meet high temperature resistant and filter the requirement of Solid micro at this；Conjunction after filtering
Enter tar catalytic bed 9 at gas, after the tar in synthesis gas is by catalytic pyrolysis at this time, become the gas of small molecule, synthesizes
Gas calorific value further increases；The synthesis gas of subsequent high temperature enters synthesis gas heat exchanger 10；Principle, synthesis are utilized according to exhaust heat stepped
Gas heat exchanger is divided into high temperature section, middle-temperature section and low-temperature zone UTILIZATION OF VESIDUAL HEAT IN；Low temperature synthesis gas after being utilized through synthesis gas heat exchanger
Into scrubbing tower 11, sour gas, vapor, dust, the tar etc. in synthesis gas are washed away；The waste liquid of generation enters waste liquid pool 25
It is recycled later；Low temperature after scrubbing tower, clean synthesis gas enter gas turbine 12 and carry out combustion power generation.
The synthesis gas afterheat utilizing system course of work is as follows：10 high temperature section waste heat of synthesis gas heat exchanger is used for heating and gasifying stove
Required is oxygen-enriched, and middle-temperature section waste heat is used for heat drying-screening for the vapor needed for heating and gasifying stove 6, low-temperature zone waste heat
Circulating flue gas needed for module 5, the part circulating flue gas come from the low-temperature flue gas after being utilized by waste heat boiler 29.
Synthesis gas electricity generation system and gas cleaning and the afterheat utilizing system course of work are as follows：Low temperature after purification
Synthesis gas enters gas turbine 12 and carries out combustion power generation, by the high-temperature flue gas that gas turbine generates, into SCR modules 13；SCR
Two parts function may be implemented in module 13, i.e. the selective reduction catalysis of the catalytic degradation function of bioxin and NOx；SCR
The catalytic degradation function of 13 bioxin of module is by being added oxygen Ji bioxin catalyst 30 is realized, and the selectivity of NOx is also
Former catalysis passes through NOxNH in selective reduction catalyst 31 and foul smell3、H2The reducibility gas such as S are realized；By SCR moulds
Flue gas after block 13 enters waste heat boiler 29, if the high-temperature steam that waste heat boiler 29 generates meets steam turbine requirement, then carries out
Steam turbine power generation, the steam that ungratified steam turbine power generation requires, can be used for domestic water, to realize heat, the electricity supply of system；Most
Eventually, part low-temperature flue gas enters and recycles, and partial fume passes through 14 direct emission of chimney.
Flue gas recirculation utilizes as follows using system work process：Contain a large amount of CO in flue gas2And it is solid in crude waste component
Carbon is determined in CO2In the presence of gasification reaction can occur, generate a large amount of CO, synthesis gas quality can be effectively improved；In addition to this,
Exhaust gas temperature is higher, by flue gas recirculation using the low temperature exhaust heat that can be efficiently used in smoke evacuation, improves the using energy source effect of system
Rate；Through the flue gas after waste heat boiler 29, partly it is expelled directly out into chimney 14, partly passes through low-temperature flue gas recycle gas blower 24
Into the low-temperature zone of synthesis gas heat exchanger 10, dry sieve sub-module 5 is entered back into, finally enters gasification furnace 6.
The above content is merely illustrative of the invention's technical idea, and protection scope of the present invention cannot be limited with this, every to press
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within claims of the present invention
Protection domain within.
Claims (10)
1. a kind of refuse gasification cogeneration system with flue gas recirculation, which is characterized in that including crude waste pretreatment system,
The crude waste feed bin (2) of crude waste pretreatment system divides two-way, is connect all the way with garbage percolation liquid treating system, another way
It is connect with the gasification furnace (6) of refuse gasification synthesis system by dry sieve sub-module (5), garbage percolation liquid treating system and rubbish
Gasification synthesis system is connect with cinder processing system；Refuse gasification synthesis system is also passed through synthetic gas cleaning system and is closed
It is connected at the synthesis gas heat exchanger (10) of gas afterheat utilizing system, synthetic gas cleaning system passes through synthesis gas electricity generation system and flue gas
Purification and residual heat system connection, for realizing refuse gasification cogeneration, gas cleaning and residual heat system pass through flue gas recirculation system
System is connect with gasification furnace (6) realizes flue gas recirculation.
2. a kind of refuse gasification cogeneration system with flue gas recirculation according to claim 1, which is characterized in that primary
Rubbish feed bin (2) passes through material conveyor (3), broken water squeezing module (4) and dry sieve sub-module (5) and gasification furnace (6) successively
Entrance connects, and the rubbish in crude waste feed bin (2) is sent by material conveyor (3) to broken water squeezing module (4), through being crushed water squeezing
Module (4) enters by drying screening module (5) in gasification furnace (6) after handling, and broken water squeezing module (4) is gone back and landfill leachate
Processing system connects.
3. a kind of refuse gasification cogeneration system with flue gas recirculation according to claim 1 or 2, which is characterized in that
Garbage percolation liquid treating system includes percolate reservoir (15), one end of percolate reservoir (15) respectively with crude waste material
High-temperature ash sifter (19) connection in storehouse (2), broken water squeezing module (4) and cinder processing system, gasification furnace (6) go out
The high-temperature ash of mouth discharge steams the percolate in percolate reservoir (15) after high-temperature ash sifter (19) screening
Send out concentration；
The other end of percolate reservoir (15) divides two-way, is connect all the way with RO modules (28) through pervaporation liquid reservoir (16),
Another way passes through lime-ash reservoir (17), the gasification furnace bed material storage tank (18) of cinder processing system and gasification furnace (6) successively
Outlet connection, evaporation liquid enter evaporation liquid reservoir (16), and the lime-ash of lime-ash reservoir (17) is used to adsorb concentrate,
Lime-ash after absorption enters gasification furnace bed material storage tank (18) as gasification furnace bed material, for bed material needed for gasification furnace (6).
4. a kind of refuse gasification cogeneration system with flue gas recirculation according to claim 3, which is characterized in that gasification
The outlet of stove (6) is connect through high-temperature ash sifter (19) with landfill yard (20), landfill yard (20) also with dry sieve sub-module (5)
Connection.
5. a kind of refuse gasification cogeneration system with flue gas recirculation according to claim 1, which is characterized in that synthesis
Gas purification system includes filter (8), and entrance and gasification furnace (6) outlet of filter (8) connect, the outlet of filter (8) according to
It is secondary to be connect with scrubbing tower (11) by catalytic bed (9), synthesis gas heat exchanger (10), it is provided with cleaning solution in scrubbing tower (11)
(22), scrubbing tower (11) outlet divides two-way, is connect all the way with synthesis gas electricity generation system, and another way passes through waste liquid pool (25) and waste liquid
Recycling module (27) is connected for being recycled.
6. a kind of refuse gasification cogeneration system with flue gas recirculation according to claim 5, which is characterized in that rubbish
The synthesis system that gasifies includes oxygen-enriched air blast machine (21), water (23) and low-temperature flue gas recycle gas blower (24), oxygen-enriched air blast machine (21)
It is connect with the entrance of gasification furnace (6) by synthesis gas heat exchanger (10) with water (23), low-temperature flue gas recycle gas blower (24) passes through
Synthesis gas heat exchanger (10) is connect with dry sieve sub-module (5).
7. a kind of refuse gasification cogeneration system with flue gas recirculation according to claim 6, which is characterized in that synthesis
Gas heat exchanger (10) includes high temperature section, middle-temperature section and low-temperature zone, and high temperature section is connect with oxygen-enriched air blast machine (21), middle-temperature section and water
(23) it connects, low-temperature zone is connect with low-temperature flue gas recycle gas blower (24).
8. a kind of refuse gasification cogeneration system with flue gas recirculation according to claim 1, which is characterized in that synthesis
Gas electricity generation system includes being provided with the gas turbine (12) of air blower (26), entrance and the purified synthesis gas system of gas turbine (12)
The scrubbing tower (11) of system connects, and synthesis gas enters gas turbine (12) for combustion power generation, and the outlet of gas turbine (12) is passed through
Gas cleaning and residual heat system are connect with smoke circulating system.
9. a kind of refuse gasification cogeneration system with flue gas recirculation according to claim 8, which is characterized in that flue gas
Purification and residual heat system include SCR modules (13), and oxygen is provided with Ji bioxin catalyst (30) and NO in SCR modules (13)x
One end of selective reduction catalyst (31), SCR modules (13) is connect with gas turbine (12), is produced for that will pass through gas turbine
Raw high-temperature flue gas is sent into SCR modules (13), and the other end is by waste heat boiler (29) for power generation or domestic water, waste heat pot
Stove (29) divides two-way, is connect all the way with chimney (14), and another way connect realization cycle profit with low-temperature flue gas recycle gas blower (24)
With.
10. a kind of refuse gasification cogeneration system with flue gas recirculation according to claim 1, which is characterized in that gas
It includes fixed-bed gasification furnace or fluidized-bed gasification furnace to change stove (6), and gasifying medium is vapor, oxygen-enriched or oxygen-enriched, in gasification furnace (6)
It is provided with desulfurization antichlor (7).
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| CN115011380A (en) * | 2022-06-29 | 2022-09-06 | 西安交通大学 | System and method for cooling high-temperature reactor waste heat pyrolysis garbage to produce hydrogen by using small-sized villiaumite |
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Application publication date: 20180821 |