CN102643703A - Novel external heating type lignite pyrolysis quality increasing system and process - Google Patents
Novel external heating type lignite pyrolysis quality increasing system and process Download PDFInfo
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Abstract
The invention relates to a novel external heating type lignite pyrolysis quality increasing system and process. The feed port of a pyrolysis oven is connected with the discharge port of a drier, and the discharge port of the pyrolysis oven is connected with a semi-coke cooling chamber; the discharge port of the semi-coke cooling chamber is connected with a burner and a finished product area; the tail gas outlet of the pyrolysis oven is sequentially connected with a dust collection device and other devices; the tail gas outlet of a desulfurizer is connected with the semi-coke cooling chamber and a gas holder, and the tail gas port of the semi-coke cooling chamber is connected with the pyrolysis oven through a high-temperature coal gas booster fan; the smoke inlet of a heat exchanger built in the pyrolysis oven is connected with the smoke outlet of the burner, and the smoke outlet of the heat exchanger is connected with a waste pan; the steam outlet of the waste pan is connected with the steam inlet of the drier; the water inlet of the waste pan is connected with the condensate water outlet of the drier; the tail gas outlet of the drier is connected with the steam inlet of the drier and other devices through the dust collection device. According to the system and the process provided by the invention, a superheated steam drying process and an external heating type fluid bed pyrolysis method are utilized to increase the quality, and the thermal efficiency, the tar yield and the calorific value of gas are improved; the sulfur content of semi-coke and waste water treatment amount are reduced; the comprehensive utilization level of resources is high; and large-scale production can be realized.
Description
Technical field
The present invention has announced a kind of novel external-heat brown coal pyrolysis upgrading system and technology, is used for the brown coal upgrading.
Background technology
When coal price sharp rises, the lignite resource of relative low price is carried out the pyrolysis upgrading, not only can obtain the semicoke of calorific value height, stable in properties; The transportation problem that solution brown coal Gao Shui, high ash cause; And can by-product high-quality tar and coal gas, solve China's oil, the nervous problem of gas resource, improved the brown coal utilising efficiency; At utmost increase benefit, meet the develop clean coal technology strategy of energy diversification of China fully.
Press the difference of heat-supplying mode, the brown coal pyrolytic process is divided into two kinds of external-heat and internal heat types.The external-heat representative processes is that the external-heat multistage that Wood stove brown coal pyrolysis process for upgrading and Chinese coal scientific research Zong Yuan Beijing coalification of Britain exploitation developed turns round brown coal pyrolysis process for upgrading.Problems such as the major objective of this method is a preparation high-quality semicoke, and coal gas can supply civilian outward or does industrial combustion gas after purifying, but the granularity and the ature of coal that exist brown coal have relatively high expectations, and the separate unit processing power is little, and thermo-efficiency is low.
Internal heat type brown coal pyrolytic process is different according to heating medium, and the coal dust fast pyrogenation can be divided into gaseous heat-carrier technology and solid thermal carriers technology.1. gaseous heat-carrier technology.Representative processes has the multistage fluidized bed COED technology of the Japanese air flow bed fine coal fast pyrolysis process and the U.S..These two kinds of technologies are strong to the flexibility of coal, and overall thermal efficiency is high, but because the steady running of total system need take into account the factors such as discharge of temperature, pressure, fluidized state and semicoke, the difficulty of real-world operation operation is high, and the difficulty that technology is amplified is big.2. solid thermal carriers technology.The representational DG technology that Garrett technology, TOSCOAL technology, LR technology and Dalian University of Science & Engineering exploitation are arranged.For solid thermal carriers coal cracking technology; Carried out number of research projects both at home and abroad; And major part carried out type approval test, but do not have commercialization so far, and major cause is that the semicoke (Ceramic Balls) of solid thermal carriers etc. all needs extra fuel combustion to its heat supply; The thermo-efficiency of whole process is lower, also has problems such as the solid phase prod utility value is low in addition.
Along with the development of Combustion technology of circulating fluidized and the requirement of coal comprehensive utilization; Solid thermal carriers coal cracking technology based on CFBC; Units such as the Cranfield university of Britain, Zhejiang University, Jinan Boiler Plant, process institute of the Chinese Academy of Sciences, Shanxi coalification institute of the Chinese Academy of Sciences have developed in succession with the cycling hot ash and as solid thermal carriers fire coal have been carried out stokehold pyrolysis generation coal gas and tar; Semicoke after the pyrolysis is sent into the stove internal combustion with production steam-electric power and heat supply as boiler oil, realizes the multi-production process of heat, electricity, oil, gas.These technologies do not need special thermal barrier heating installation just can obtain stable elevated temperature heat carrier source, and pyrolysis char directly is used for COMBUSTION IN CIRCULATION FLUIDIZED BED, has made full use of the sensible heat of semicoke, and the heat utilization efficiency of total system is high; Need not separation by the pyrolysis char of thermal barrier dilution and directly return boiler combustion, be worth low problem thereby overcome conventional solid heat carrier pyrolysis process solids product utilization; Aspect pollutant removing; Because the part sulfur-bearing nitrogenous compound enrichment in pyrolytic process in the coal removes; Make circulating fluidized bed desulfur denitrogenation load significantly reduce, but aspect industriallization, still have a lot of problems, major cause is generally to have run in the process development some technical problems; As solid materials mix, the foldback etc. of semicoke (or Ceramic Balls) and ash after the purification of dust-laden pyrolysis gas and the pyrolysis, hindered the further exploitation of this technology.
Summary of the invention
The objective of the invention is for overcoming the deficiency of above-mentioned prior art, provide a kind of have system simple and reliable, can maximization, the novel external-heat brown coal pyrolysis upgrading system and the technology of reduced investment, efficient energy-saving, advantage such as tar yield is high, wastewater treatment capacity is little.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of novel external-heat brown coal pyrolysis upgrading system, internal heating fluidized bed pyrolysis oven opening for feed is connected with the split type superheated vapour rotary dryer of endless tube discharge port; Internal heating fluidized bed pyrolysis oven discharge port is connected with semicoke cooling room opening for feed, and semicoke cooling room discharge port is connected respectively with burner, finished product district;
Internal heating fluidized bed pyrolysis oven tail gas outlet is collected with second cleaning apparatus, tar, desulfurizer is connected; The outlet of desulfurizer tail gas is connected with the semicoke cooling room, and the tail gas mouth of semicoke cooling room is connected with internal heating fluidized bed pyrolysis oven through the coal gas of high temperature booster fan;
The exhanst gas outlet one tunnel of internal heating fluidized bed pyrolysis oven built-in heat exchanger and the gas approach of sending internal heating fluidized bed pyrolysis oven after the exhanst gas outlet of burner is connected back to; Another road is connected with useless pot, and the vapour outlet of useless pot is connected with the steam inlet of the split type superheated vapour rotary dryer of endless tube; The water-in of useless pot is connected with the condensation-water drain of the split type superheated vapour rotary dryer of waste-heat recovery device and endless tube;
The tail gas of the split type superheated vapour rotary dryer of endless tube exports one road warp, first cleaning apparatus and is connected with the split type superheated vapour rotary dryer of endless tube steam inlet, and another road is connected with waste-heat recovery device.
Said internal heating fluidized bed pyrolysis oven is a percolation bed form, comprises body of heater, and upper of furnace body is provided with air outlet and is connected with second cleaning apparatus; In body of heater, be provided with at least one group of flue gas collection case; Each flue gas collection case connects from beginning to end, and whole tube side is a S shape, is provided with gas approach and exhanst gas outlet respectively at the flue gas Ji Xiangchu of head and the tail; Be provided with several heat transfer tubes in the adjacent flue gas collection case, each heat transfer tube two ends vertical direction is provided with tube sheet; Is to spray calandria wind distribution device in the body of heater bottom, is got into bed through air-distributing device, make material loosening and take volatile matter by the coal gas of semicoke preheating.
Said first cleaning apparatus comprises tornado dust collector I, electric precipitator I; The tail gas of the split type superheated vapour rotary dryer of endless tube is connected with the split type superheated vapour rotary dryer of endless tube steam inlet through tornado dust collector I, electric precipitator I, and the material that tornado dust collector I collects is sent into internal heating fluidized bed pyrolysis oven opening for feed.
Said second cleaning apparatus comprises tornado dust collector II, the ceramic multicyclone dust collector that sets gradually, and ceramic multicyclone dust collector is collected with tar, desulfurizer is connected, and the material that tornado dust collector II collects is sent into the semicoke cooling room.
The split type superheated vapour rotary drying of said endless tube machine inlet capable is connected with feed bin through worm conveyor I; The material that endless tube split type superheated vapour rotary dryer discharge port and tornado dust collector I collect is connected with internal heating fluidized bed pyrolysis oven opening for feed through dry coal storehouse, worm conveyor II, and a road in the exhanst gas outlet of internal heating fluidized bed pyrolysis oven built-in heat exchanger sent into useless pot through the dry coal storehouse; The thermal source part of the split type superheated vapour rotary dryer of endless tube is from waste heat boiler, and a part is from the tail gas of himself.
Said coal gas of high temperature booster fan is installed in semicoke cooling room nearest place afterwards, guarantees that the flue-gas temperature that gets into the coal gas of high temperature booster fan is not less than 350 ℃; Before the coal gas of high temperature booster fan is imported and exported, should add and put expansion joint, sealed structure is " air current sealed ", no consumable accessory in the sealing.
A kind of technology that adopts novel external-heat brown coal pyrolysis upgrading system, it is integrated with brown coal drying pyrolysis upgrading, and concrete steps are following:
(1) wet brown coal are delivered to the split type superheated vapour rotary dryer of endless tube; After being dried to the moisture of requirement; Discharged by the discharge port of the split type superheated vapour rotary drying of endless tube drive end unit, the dry powder of collecting with the tornado dust collector I of first cleaning apparatus is delivered to internal heating fluidized bed pyrolysis oven opening for feed;
Moisture and the partial material separated out when dry are carried by the superheated vapour in the split type superheated vapour rotary dryer of endless tube; After one tunnel tornado dust collector I, the electric precipitator I dedusting through first cleaning apparatus; Return the recycle of the split type superheated vapour rotary dryer of endless tube, another road is advanced waste-heat recovery device and is recycled its heat energy; Drying machine water of condensation and the water after the waste-heat recovery device heat exchange get into useless pot together;
(2) dried brown coal get into and carry out the fast pyrogenation section in the internal heating fluidized bed pyrolysis oven, and the semicoke of generation is discharged, and the dry powder of collecting with the tornado dust collector II of second cleaning apparatus is delivered to the semicoke cooling room; A cooled semicoke part gets into burner combustion, and a part is delivered to the finished product district and sends outside;
(3) the brown coal fugitive constituent of separating out is after the second cleaning apparatus dedusting; After tar and phenol polymer are separated out in condensation; Get into tar collection, desulfurizer desulfurization, the coal gas part after the desulfurization gets into the cooling of semicoke cooling room, after the heat exchange of high temperature semicoke; Get into internal heating fluidized bed pyrolysis oven through the coal gas of high temperature booster fan and make brown coal keep fluidization, another part gets into the gas holder pressurization and sends outside; Tar after the desulfurization is sent outside;
(4) after the flue gas behind flue gas after the built-in heat exchanger heat exchange of internal heating fluidized bed pyrolysis oven one tunnel and the coal-char combustion is mixed together adjusting; Return internal heating fluidized bed pyrolysis oven built-in heat exchanger internal heating brown coal again; Another road gets into useless pot, and the superheated vapour of generation is as the thermal source and the carrier gas of dehumidification system.
In the said step (1), said dried coal dust temperature is 100～120 ℃.
In the said step (1), in the split type superheated vapour rotary dryer of endless tube logical as vapor temperature be 180 ℃.
In the said step (1), 60～90% steam cycle utilization in the split type superheated vapour rotary dryer of the said endless tube tail gas, 10～40% steam is discharged drying machine.
In the said step (1), 70～80 ℃ of water that the condensation of the split type superheated vapour rotary dryer of said endless tube is discharged and get into useless pot together through 40～60 ℃ of water of waste-heat recovery device heating.
In the said step (2), high-temperature flue gas is 750～900 ℃ in the internal heating fluidized bed pyrolysis oven built-in heat exchanger.
In the said step (2), hot semicoke dump temperature is controlled at 550～600 ℃ in the said pyrolysis oven.
In the said step (3), the coal gas 60～80% of discharging from desulfurizer gets into semicoke cooling room cooling semicoke; 20～40% get into the gas holder pressurization sends outside.
The present invention adopts rotary dryer and fluidized-bed tandem process; Drying and pyrolysis are carried out in two steps; Adopt two temperature grade technologies, and flue gas that can pyrolysis is intact is through useless pot generation steam, as the thermal source of brown coal drying; The water that is evaporated in the brown coal is all recycled, and makes system thermal efficiency improve greatly.
The used pyrolysis oven of brown coal pyrolysis is the percolation bed, and the multilayer interchanger is along bed arrangement, and the required heat of pyrolysis is all provided by built-in heat exchanger, is only play a part to make material loosening and take volatile matter by the coal gas of semicoke preheating.On the one hand this device operating gas velocity is lower than conventional fluidized-bed, and required tolerance reduces greatly, can reduce effectively that material in the fluidized-bed is carried secretly, the elutriation loss, and the corresponding load that reduces dust-removal system, system's power consumption and waste-heat rejection have alleviated environmental protection pressure; On the other hand; The internal heating fluidized bed brown coal pyrolysis requirement fluidizing agent that is used for can not contain oxygen, and the heating gas that quenching is produced is transmitted back to internal heating fluidized bed pyrolysis reactor, makes that pyrolytic process is a Non-oxygen pyrolytic process; Coal dust free burning and explosion hazard, safe and reliable.
Adopt cooled coal gas as cold burnt medium, the high temperature semicoke that pyrolysis is obtained is after the cooling room heat exchange, and supercharging is transmitted back to pyrolysis oven; The recyclable semicoke heat that utilizes, in addition, coal gas has good heat transfer performance and big thermal capacitance; Help reducing cold Jiao's gas material ratio, reduce system dynamic consumption; H in the coal gas
2Help separating out of sulphur and tar in the coal again, help improving semicoke quality and tar yield, not only can effectively cool off semicoke, also improved the utilising efficiencys of different taste energy in the system, reduced energy consumption and environmental pollution.
Adopt present technique to carry out the brown coal upgrading, but the conserve water resource effectively improves thermo-efficiency, tar yield and caloric power of gas, reduce sulphur content and wastewater treatment capacity in the semicoke, the comprehensive utilization of resources level is high, realizes scale operation.
The invention has the beneficial effects as follows:
(1) system can maximize, and floor space is little, reduced investment.Energy saving of system is efficient as the pyrolytic major equipment with internal heating fluidized bed, and floor space is little; Reduced investment; Can maximize, 70 square metres the internal heating fluidized bed year processing power that can satisfy 2,000,000 tons of brown coal of producing at present, centering large-lot producer industrial scale benefit is obvious.
(2) efficient energy-saving.Because the most of heat of pyrolysis is to be provided by the high built-in heat exchanger of heat exchange efficiency; Heating gas is only as the power medium that guarantee normal fluidization; Its operating gas velocity is lower than conventional fluidized-bed, and the material that can reduce effectively in the fluidized-bed is carried secretly and elutriation loss, the corresponding load that reduces dust-removal system; The also corresponding minimizing 70% of its system's power consumption and waste-heat rejection, thermo-efficiency is high.
(3) tar yield is high.Because used internal heating fluidized bed of pyrolysis is that the multilayer built-in heat exchanger is set on the basis of common fluidized-bed, heat exchange efficiency is high, can make brown coal be raised to whole temperature with fast speeds, helps tar and separates out; Simultaneously to contain a large amount of H
2Heating gas be fluidisation power medium, H
2Existence also help tar and separate out.
(4) wastewater treatment capacity is little, and environmental protection pressure is low.Carry out the brown coal upgrading through brown coal superheat steam drying and low temperature pyrogenation two-stage process, overheating steam drying process can all be recycled the water that is evaporated in the brown coal, and energy-saving effect is remarkable; The pyrolytic process wastewater flow rate is little, and environmental protection pressure is low, is environmentally friendly, water resources saving type clean coal technology.
(5) security of system is reliable.It is fluid that drying process and pyrolytic process adopt uncooled steam of outlet and the coal gas after purifying respectively, and two processes all are oxygen-free process, coal dust free burning and explosion hazard, and security of system is reliable.
Description of drawings
Fig. 1 is the process flow sheet of the specific embodiment of the invention.
The internal heating fluidized bed pyrolysis oven of Fig. 2.
Wherein, 1. feed bin, 2. worm conveyor I, the 3. split type superheated vapour rotary dryer of endless tube, 4. tornado dust collector I; 5. electric precipitator I, 6. dry coal storehouse, 7. worm conveyor II, 8. internal heating fluidized bed pyrolysis oven, 9. tornado dust collector II; 10. ceramic multicyclone dust collector, 11. coal gas of high temperature booster fans, 12. semicoke cooling rooms, 13. gas approachs, 14. flue gas collection casees; 15. flow deflector, 16. tube sheets, 17. heat transfer tubes, 18. exhanst gas outlets, 19. air outlets; 20. burner, 21. tar are collected, 22. desulfurizers, 23. useless pots, 24. waste heat recoveries.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Among Fig. 1, a kind of novel external-heat brown coal pyrolysis upgrading system, internal heating fluidized bed pyrolysis oven 8 opening for feeds are connected with split type superheated vapour rotary dryer 3 discharge ports of endless tube; Internal heating fluidized bed pyrolysis oven 8 discharge ports are connected with semicoke cooling room 12 opening for feeds, and semicoke cooling room 12 discharge ports are connected respectively with burner 20, finished product district;
Internal heating fluidized bed pyrolysis oven 8 tail gas outlet is connected with second cleaning apparatus, tar collection 21, desulfurizer 22; The outlet of desulfurizer 22 tail gas is connected with semicoke cooling room 12, and the tail gas mouth of semicoke cooling room 12 is connected with internal heating fluidized bed pyrolysis oven 8 through coal gas of high temperature booster fan 11;
The exhanst gas outlet one tunnel of internal heating fluidized bed pyrolysis oven 8 built-in heat exchangers and the gas approach of sending internal heating fluidized bed pyrolysis oven 8 after the exhanst gas outlet of burner 20 is connected back to; Another road is connected with useless pot 23, and the vapour outlet of useless pot 23 is connected with the steam inlet of the split type superheated vapour rotary dryer 3 of endless tube; Useless pot 23 water-ins are connected with split type superheated vapour rotary dryer 3 condensation-water drains of waste-heat recovery device 24 and endless tube respectively;
The tail gas of the split type superheated vapour rotary dryer 3 of endless tube exports one the tunnel and after the first cleaning apparatus dedusting, is connected with split type superheated vapour rotary dryer 3 steam inlets of endless tube, and another road is connected with waste-heat recovery device 24.
Wherein, internal heating fluidized bed pyrolysis oven 8 is percolation bed form, and is as shown in Figure 2, comprises body of heater, and upper of furnace body is provided with air outlet 19 and is connected with second cleaning apparatus; In body of heater, be provided with at least one group of flue gas collection case 14; Each flue gas collection case 14 head and the tail connects; Whole tube side is a S shape; Be provided with gas approach 13 and exhanst gas outlet 18 respectively at flue gas collection case 14 places of head and the tail, be provided with several heat transfer tubes 17 in the adjacent flue gas collection case 14, each heat transfer tube 17 two ends vertical direction is provided with tube sheet 16; In body of heater, also be provided with flow deflector 15; Is to spray calandria wind distribution device in the body of heater bottom, is got into bed through air-distributing device, make material loosening and take volatile matter by the coal gas of semicoke preheating.
First cleaning apparatus comprises tornado dust collector I4, electric precipitator I5; The tail gas of the split type superheated vapour rotary dryer 3 of endless tube is connected with split type superheated vapour rotary dryer 3 steam inlets of endless tube through tornado dust collector I4, electric precipitator I5, and the material that tornado dust collector I4 collects is sent into internal heating fluidized bed pyrolysis oven 8 opening for feeds.
Second cleaning apparatus comprises tornado dust collector II9, the ceramic multicyclone dust collector 10 that sets gradually, and ceramic multicyclone dust collector 10 is collected with tar, desulfurizer 21 is connected, and the material that tornado dust collector II9 collects is sent into semicoke cooling room 12.
Split type superheated vapour rotary dryer 3 opening for feeds of endless tube are connected with feed bin 1 through worm conveyor I2; The material that split type superheated vapour rotary dryer 3 discharge ports of endless tube and tornado dust collector I4 collect is connected with internal heating fluidized bed pyrolysis oven 8 opening for feeds through dry coal storehouse 6, worm conveyor II7, and a road in the exhanst gas outlet of internal heating fluidized bed pyrolysis oven 8 built-in heat exchangers sent into useless pot 23 through dry coal storehouse 6; The thermal source part of the split type superheated vapour rotary dryer 3 of endless tube is from useless pot 23 (waste heat boilers), and a part is from the tail gas of himself.
Coal gas of high temperature booster fan 11 is installed in semicoke cooling room 12 nearest place afterwards, guarantees that the flue-gas temperature that gets into coal gas of high temperature booster fan 11 is not less than 350 ℃; Before coal gas of high temperature booster fan 11 is imported and exported, should add and put expansion joint, sealed structure is " air current sealed ", no consumable accessory in the sealing.
Practical implementation step of the present invention is following:
(1) moisture 30%～50% wet brown coal are delivered to the split type superheated vapour rotary dryer 3 of endless tube by worm conveyor I2, and brown coal are walked tube side, and superheated vapour is walked shell side.Brown coal are along with the rotation of cylindrical shell is promoted, offers by flight in the split type superheated vapour rotary dryer 3 of endless tube; Utilize multiple heat exchange modes such as convection current, conduction, radiation that brown coal are carried out drying; Through the control residence time of brown coal in the split type superheated vapour rotary dryer 3 of endless tube; After being dried to the moisture of requirement; Discharge valve by the discharge port of split type superheated vapour rotary dryer 3 afterbodys of endless tube is installed is discharged, and 100～120 ℃ of brown coal collecting with the discharge valve of tornado dust collector I4 are delivered to dry coal storehouse 7, send into internal heating fluidized bed pyrolysis oven 8 through worm conveyor II7.
Simultaneously; Brown coal drying separates out moisture and partial material is carried by the superheated vapour in the split type superheated vapour rotary dryer 3 of endless tube; After tornado dust collector I4 and electric precipitator I5 dedusting; Taken out by blower fan and to draw, a part is returned split type superheated vapour rotary dryer 3 recycles of endless tube, and another part advances waste-heat recovery device 24 and recycles its heat energy.
(2) dried moisture 5% brown coal are fallen in the stove by the discharge valve of internal heating fluidized bed pyrolysis oven 8 opening for feeds; The required heat of pyrolysis is provided by built-in heat exchanger; Got into bed by the coal gas of semicoke preheating through spraying calandria wind distribution device; The fluidizing medium that in this process, gets into bed is controlled effectively, thereby makes an interior material keep stable fluidization.Make brown coal separate out volatile matter fast through controlling bed height, fluidizing velocity, service temperature, an interior residence time etc.; 550～600 ℃ of hot semicokes that obtain; Discharge valve by the discharge port of internal heating fluidized bed pyrolysis oven 8 is installed is discharged; The dry powder of collecting with tornado dust collector II9 discharge valve is delivered to 12 coolings of semicoke cooling room, and a cooled semicoke part gets into burner 20 burnings, and a part is delivered to the finished product district and sends outside.
(3) the brown coal pyrolysis is separated out volatile matter and partial material is carried by the pyrolysis gas in the bed; Flow out internal heating fluidized bed pyrolysis oven 8 from air outlet, after high-temperature cyclone dust extractor II9 and ceramic multicyclone dust collector 10 dedustings, through condenser condenses; Separate out tar and phenol polymer; Deliver to through blower fan pressurization from the condensing surface effluent air that tar collects 21, desulfurizer 22 (for example thionizer) desulfurization, the coal gas after the desulfurization pressurizes through blower fan and one the road delivers to semicoke cooling room 12, after the heat exchange of high temperature semicoke; Get into internal heating fluidized bed pyrolysis oven 8 through coal gas of high temperature booster fan 11 by the bottom air compartment, another part gets into the gas holder pressurization and sends outside;
(4) after the flue gas behind flue gas after the internal heating fluidized bed pyrolysis oven 8 built-in heat exchanger heat exchange one tunnel and the coal-char combustion is mixed together adjusting; Get into internal heating fluidized bed pyrolysis oven 8 built-in heat exchanger internal heating brown coal again; Another road gets into useless pot 23 and carries out heat exchange; The superheated vapour that useless pot 23 produces gets into split type superheated vapour rotary dryer 3 steam distribution chamber of endless tube through the reducing valve decompression; Get in each heating tube through the take-off pipe on it, the water of condensation of formation steam distribution indoor utilize siphon principle discharge the split type superheated vapour rotary dryer 3 of endless tube outer with waste-heat recovery device 24 heat exchange after water get into useless pot 23 together.
Claims (14)
1. a novel external-heat brown coal pyrolysis upgrading system is characterized in that internal heating fluidized bed pyrolysis oven opening for feed is connected with the split type superheated vapour rotary dryer of endless tube discharge port; Internal heating fluidized bed pyrolysis oven discharge port is connected with semicoke cooling room opening for feed, and semicoke cooling room discharge port is connected respectively with burner, finished product district;
Internal heating fluidized bed pyrolysis oven tail gas outlet is collected with second cleaning apparatus, tar, desulfurizer is connected successively; The outlet of desulfurizer tail gas is connected respectively with semicoke cooling room, gas holder, and the tail gas mouth of semicoke cooling room is connected with internal heating fluidized bed pyrolysis oven through the coal gas of high temperature booster fan;
The exhanst gas outlet one tunnel of internal heating fluidized bed pyrolysis oven built-in heat exchanger and the gas approach of sending internal heating fluidized bed pyrolysis oven after the exhanst gas outlet of burner is connected back to; Another road is connected with useless pot gas approach, and the vapour outlet of useless pot is connected with the steam inlet of the split type superheated vapour rotary dryer of endless tube; Useless pot water-in is connected respectively with the drying machine condensation-water drain with waste-heat recovery device;
The tail gas of the split type superheated vapour rotary dryer of endless tube exports one the tunnel and after the first cleaning apparatus dedusting, is connected with the split type superheated vapour rotary dryer of endless tube steam inlet, and another road is connected with waste-heat recovery device.
2. novel external-heat brown coal pyrolysis upgrading as claimed in claim 1 system is characterized in that said internal heating fluidized bed pyrolysis oven is a percolation bed form, comprises body of heater, and upper of furnace body is provided with air outlet and is connected with second cleaning apparatus; In body of heater, be provided with at least one group of flue gas collection case; Each flue gas collection case connects from beginning to end, and whole tube side is a S shape, is provided with gas approach and exhanst gas outlet respectively at the flue gas Ji Xiangchu of head and the tail; Be provided with several heat transfer tubes in the adjacent flue gas collection case, each heat transfer tube two ends vertical direction is provided with tube sheet; Is to spray calandria wind distribution device in the body of heater bottom, is got into bed through air-distributing device, make material loosening and carry volatile matter by the coal gas of semicoke preheating.
3. novel external-heat brown coal pyrolysis upgrading as claimed in claim 1 system; It is characterized in that; Said first cleaning apparatus comprises tornado dust collector I, electric precipitator I; The tail gas of the split type superheated vapour rotary dryer of endless tube is connected with the split type superheated vapour rotary dryer of endless tube steam inlet through tornado dust collector I, electric precipitator I, and the material that tornado dust collector I collects is sent into internal heating fluidized bed pyrolysis oven opening for feed.
4. according to claim 1 or claim 2 novel external-heat brown coal pyrolysis upgrading system; It is characterized in that; Said second cleaning apparatus comprises tornado dust collector II, the ceramic multicyclone dust collector that sets gradually; Ceramic multicyclone dust collector is collected with tar, desulfurizer is connected, and the material that tornado dust collector II collects is sent into the semicoke cooling room.
5. novel external-heat brown coal pyrolysis upgrading as claimed in claim 1 system is characterized in that the split type superheated vapour rotary drying of said endless tube machine inlet capable is connected with feed bin through worm conveyor I; The material that endless tube split type superheated vapour rotary dryer discharge port and tornado dust collector I collect is connected with internal heating fluidized bed pyrolysis oven opening for feed through dry coal storehouse, worm conveyor II, and a road in the exhanst gas outlet of internal heating fluidized bed pyrolysis oven built-in heat exchanger sent into useless pot through the dry coal storehouse; The thermal source part of the split type superheated vapour rotary dryer of endless tube is from waste heat boiler, and a part is from the tail gas of himself.
6. novel external-heat brown coal pyrolysis upgrading as claimed in claim 1 system is characterized in that, said coal gas of high temperature booster fan is installed in nearest place after the semicoke cooling room, guarantees that the flue-gas temperature that gets into the coal gas of high temperature booster fan is not less than 350 ℃; Before the coal gas of high temperature booster fan is imported and exported, should add and put expansion joint, sealed structure is " air current sealed ", no consumable accessory in the sealing.
7. technology that adopts the described novel external-heat brown coal pyrolysis upgrading of claim 1 system, it is integrated with brown coal drying pyrolysis upgrading, it is characterized in that concrete steps are following:
(1) wet brown coal are delivered to the split type superheated vapour rotary dryer of endless tube; After being dried to the moisture of requirement; Discharged by the discharge port of the split type superheated vapour rotary drying of endless tube drive end unit, the dry powder of collecting with the tornado dust collector I of first cleaning apparatus is delivered to internal heating fluidized bed pyrolysis oven opening for feed;
Moisture and the partial material separated out when dry are carried by the superheated vapour in the split type superheated vapour rotary dryer of endless tube; After the tornado dust collector I of first cleaning apparatus, electric precipitator I dedusting; One the tunnel returns the recycle of the split type superheated vapour rotary dryer of endless tube, and another road is advanced waste-heat recovery device and recycled its heat energy; Drying machine water of condensation and get into useless pot together through the water of waste-heat recovery device heating;
(2) dried brown coal get into and carry out the fast pyrogenation section in the internal heating fluidized bed pyrolysis oven, and the semicoke of generation is discharged, and the dry powder of collecting with the tornado dust collector II of second cleaning apparatus is delivered to the semicoke cooling room; A cooled semicoke part gets into burner combustion, and a part is delivered to the finished product district and sends outside;
(3) the brown coal fugitive constituent of separating out is after the second cleaning apparatus dedusting; After tar and phenol polymer are separated out in condensation; Get into tar collection, desulfurizer desulfurization, the coal gas part after the desulfurization gets into the cooling of semicoke cooling room, after the heat exchange of high temperature semicoke; Get into internal heating fluidized bed pyrolysis oven through the coal gas of high temperature booster fan and make brown coal keep fluidization, another part gets into the gas holder pressurization and sends outside; Tar after the desulfurization is sent outside;
(4) after the flue gas behind flue gas after the built-in heat exchanger heat exchange of internal heating fluidized bed pyrolysis oven one tunnel and the coal-char combustion is mixed together adjusting; Return internal heating fluidized bed pyrolysis oven built-in heat exchanger internal heating brown coal again; Another road gets into useless pot, and the superheated vapour of generation is as the thermal source and the carrier gas of dehumidification system.
8. technology according to claim 7 is characterized in that: in the said step (1), said dried coal dust temperature is 100～120 ℃.
9. technology according to claim 7 is characterized in that: in the said step (1), the vapor temperature that feeds in the split type superheated vapour rotary dryer of endless tube is 180 ℃.
10. novel external-heat brown coal pyrolysis upgrading according to claim 7 system; It is characterized in that: in the said step (1); 60～90% steam cycle utilization in the split type superheated vapour rotary dryer of the said endless tube tail gas, 10～40% steam is discharged drying machine.
11. technology according to claim 7 is characterized in that: in the said step (2), high-temperature flue gas is 750～900 ℃ in the built-in heat exchanger of internal heating fluidized bed pyrolysis oven.
12. technology according to claim 7 is characterized in that: in the said step (2), hot semicoke dump temperature is controlled at 550～600 ℃ in the said pyrolysis oven.
13. technology according to claim 7 is characterized in that: in the said step (3), the coal gas 60～80% of discharging from desulfurizer gets into semicoke cooling room cooling semicoke, and 20～40% get into the gas holder pressurization sends outside.
14. technology according to claim 7 is characterized in that: in the said step (3), 70～80 ℃ of water of discharging from the rotary dryer condensation and get into useless pot together through 40～60 ℃ of water of waste-heat recovery device heating.
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