CN102643703B - 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 an 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, a tar collection and desulfuration device; 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 waste heat recovery device 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 external-heat brown coal pyrolysis upgrading system and technique, for brown coal upgrading.
Background technology
When coal price sharp rises, the lignite resource of relative low price is carried out to pyrolysis upgrading, not only can obtain that calorific value is high, the semicoke of stable in properties, the transportation problem that solution brown coal Gao Shui, high ash cause, and can by-product high-quality burnt oil and gas, solve the nervous problem of China's petroleum and gas resources, improved brown coal utilising efficiency, at utmost increase benefit, meet the develop clean coal technology strategy of energy diversification of China completely.
Press the difference of heat-supplying mode, brown coal pyrolytic process is divided into two kinds of external-heat and internal heat types.External-heat representative processes is the Wood stove brown coal pyrolysis process for upgrading of Britain exploitation and external-heat multistage revolution brown coal pyrolysis process for upgrading that Chinese coal scientific research Zong Yuan Beijing coalification is developed.The major objective of the method is preparation high-quality semicoke, and coal gas is after purifying, can be outward for civilian use or do industrial combustion gas, but exists the problems such as granularity and the ature of coal of brown coal are had relatively high expectations, and 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 coal dust fast pyrogenation can be divided into gaseous heat-carrier technique and solid thermal carriers technique.1. gaseous heat-carrier technique.Representative processes has the multistage fluidized bed COED technique of Japanese air flow bed fine coal fast pyrolysis process and the U.S..The strong adaptability of these two kinds of techniques to coal, overall thermal efficiency is high, but because the steady running of whole system need to 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 technique is amplified is large.2. solid thermal carriers technique.The representational DG technique that has Garrett technique, TOSCOAL technique, LR technique and Dalian University of Science & Engineering exploitation.For solid thermal carriers pyrolytic process of coal, carried out a large amount of research work both at home and abroad, and major part has been carried out type approval test, but there is no so far commercialization, major cause is that 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 in addition the problems such as solid phase prod utility value is low.
Along with the development of Combustion technology of circulating fluidized and the requirement of coal comprehensive utilization, solid thermal carriers pyrolytic process of coal based on circulating fluidized bed combustion, the Cranfield university of Britain, Zhejiang University, Jinan Boiler Plant, process institute of the Chinese Academy of Sciences, Shanxi coalification Suo Deng unit of the Chinese Academy of Sciences have developed in succession usings cycling hot ash and as solid thermal carriers, fire coal is carried out to stokehold pyrolysis and produce coal gas and tar, semicoke after pyrolysis is sent into burning in stove as boiler oil and, with production steam-electric power and heat supply, is realized the multi-production process of heat, electricity, oil, gas.These techniques do not need special thermal barrier heating installation just can obtain stable high-temperature heat carrier source, and pyrolysis char is directly used in the burning of circulating fluidized bed, takes full advantage of the sensible heat of semicoke, and the heat utilization efficiency of whole system is high; The pyrolysis char being diluted by thermal barrier directly returns to boiler combustion without separation, thereby overcome conventional solid heat carrier pyrolysis process solids product utilization, is worth low problem; Aspect pollutant removing, because the part sulfur-bearing nitrogenous compound enrichment in pyrolytic process in coal removes, circulating fluidized bed desulfur denitrifying load is significantly reduced, but aspect industrialization, still there are a lot of problems, major cause is generally to have run in process development some technical problems, as solid materials mixes, after the purification of dust-laden pyrolysis gas and pyrolysis, semicoke (or Ceramic Balls) and grey foldback etc., hindered the further exploitation of this technique.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, provide a kind of have system simple and reliable, can maximization, reduced investment, efficient energy-saving, Novel external heat type brown coal pyrolysis upgrading system and the technique of the advantage such as tar yield is high, wastewater treatment capacity is little.
For achieving the above object, the present invention adopts following technical scheme:
An 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 the second cleaning apparatus, tar, desulfurizer is connected, the outlet of desulfurizer tail gas is connected with semicoke cooling room, and the tail gas mouth of semicoke cooling room is connected with internal heating fluidized bed pyrolysis oven through coal gas of high temperature booster fan;
After being connected with the exhanst gas outlet of burner, exhanst gas outlet one tunnel of internal heating fluidized bed pyrolysis oven built-in heat exchanger sends the gas approach of internal heating fluidized bed pyrolysis oven 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 road 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.
Described internal heating fluidized bed pyrolysis oven is percolation bed form, comprises body of heater, and upper of furnace body is provided with air outlet and is connected with the second cleaning apparatus; In body of heater, be provided with at least one group of flue gas header, each flue gas header connects from beginning to end, and whole tube side is S shape, at the flue gas header place of head and the tail, is respectively equipped with gas approach and exhanst gas outlet, in adjacent flue gas header, be provided with several heat transfer tubes, each heat transfer tube two ends vertical direction is provided with tube sheet; At lower portion of furnace body, be to spray calandria wind distribution device, by the coal gas of semicoke preheating, through air-distributing device, entered bed, material is become flexible and take volatile matter.
Described the 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.
Described the second cleaning apparatus comprises tornado dust collector II, the ceramic multicyclone dust collector setting 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 semicoke cooling room.
The split type superheated vapour rotary drying of described endless tube machine inlet capable is connected with feed bin by 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 by dry coal storehouse, worm conveyor II, and useless pot is sent on exhanst gas outlet Zhong mono-tunnel of internal heating fluidized bed pyrolysis oven built-in heat exchanger through dry coal storehouse; A thermal source part for 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.
Described coal gas of high temperature booster fan, is arranged on semicoke cooling room nearest place afterwards, guarantees that the flue-gas temperature that enters coal gas of high temperature booster fan is not less than 350 ℃; Before coal gas of high temperature booster fan is imported and exported, should add and put expansion joint, sealed structure is " air current sealed ", and sealing is interior without consumable accessory.
Adopt a technique for external-heat brown coal pyrolysis upgrading system, it is integrated by brown coal drying pyrolysis upgrading, and concrete steps are as follows:
(1) wet brown coal are delivered to the split type superheated vapour rotary dryer of endless tube, be dried to after the moisture of requirement, discharge port by the split type superheated vapour rotary drying of endless tube drive end unit is discharged, and is delivered to internal heating fluidized bed pyrolysis oven opening for feed together with the dry powder of collecting with the tornado dust collector I of the first cleaning apparatus;
The moisture of separating out when dry and partial material are carried by the superheated vapour in the split type superheated vapour rotary dryer of endless tube, one tunnel is after the tornado dust collector I of the first cleaning apparatus, electric precipitator I dedusting, return to the recycle of the split type superheated vapour rotary dryer of endless tube, another road is entered waste-heat recovery device and is recycled its heat energy; Drying machine water of condensation with together with water after waste-heat recovery device heat exchange, enter useless pot;
(2) dried brown coal enter and in internal heating fluidized bed pyrolysis oven, carry out fast pyrogenation section, and the semicoke of generation is discharged, and are delivered to semicoke cooling room together with the dry powder of collecting with the tornado dust collector II of the second cleaning apparatus; A cooled semicoke part enters burner combustion, and a part is delivered to finished product district and sends outside;
(3) fugitive constituent that brown coal are separated out is after the second cleaning apparatus dedusting, after condensation tar and phenol polymer, enter tar collection, desulfurizer desulfurization, it is cooling that a coal gas part after desulfurization enters semicoke cooling room, after the heat exchange of high temperature semicoke, through coal gas of high temperature booster fan, enter internal heating fluidized bed pyrolysis oven and make brown coal maintain fluidization, another part enters gas holder pressurization and sends outside; Tar after desulfurization is sent outside;
(4) flue gas one tunnel after the built-in heat exchanger heat exchange of internal heating fluidized bed pyrolysis oven and the flue gas after coal-char combustion are mixed together after adjusting, return to again heating brown coal in internal heating fluidized bed pyrolysis oven built-in heat exchanger, another road enters useless pot, and the superheated vapour of generation is as thermal source and the carrier gas of dehumidification system.
In described step (1), described dried coal dust temperature is 100～120 ℃.
In described step (1), in the split type superheated vapour rotary dryer of endless tube logical as vapor temperature be 180 ℃.
In described step (1), 60～90% steam cycle utilization in the split type superheated vapour rotary drying of described endless tube tail gas, 10～40% steam is discharged drying machine.
In described step (1), 70～80 ℃ of water that the condensation of the split type superheated vapour rotary dryer of described endless tube is discharged enter useless pot together with 40～60 ℃ of water that heat through waste-heat recovery device.
In described step (2), in internal heating fluidized bed pyrolysis oven built-in heat exchanger, high-temperature flue gas is 750～900 ℃.
In described step (2), in described pyrolysis oven, hot semicoke dump temperature is controlled at 550～600 ℃.
In described step (3), the coal gas 60～80% of discharging from desulfurizer enters the cooling semicoke of semicoke cooling room; 20～40% enter gas holder pressurization sends outside.
The present invention adopts rotary dryer and fluidized-bed tandem process, to be dried with pyrolysis and carry out in two steps, adopt two temperature grade techniques, and the complete flue gas of pyrolysis can be produced to steam through useless pot, thermal source as brown coal drying, the water being evaporated in brown coal is all recycled, and system thermal efficiency is improved greatly.
Brown coal pyrolysis pyrolysis oven used is percolation bed, and Multi-layer exchanging heat device 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 to become flexible 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 effectively reduce that material in fluidized-bed is carried secretly, elutriation loss, and the corresponding load that reduces dust-removal system, system power consumption and waste-heat rejection, alleviated environmental protection pressure; On the other hand, internal heating fluidized bedly for brown coal pyrolysis, require fluidizing agent can not contain oxygen, the heating gas that quenching is produced is transmitted back to internal heating fluidized bed pyrolysis reactor, and making 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 cooling room heat exchange, and supercharging is transmitted back to pyrolysis oven, recoverable semicoke heat, in addition, coal gas has good heat transfer property and larger thermal capacitance, be conducive to reduce cold Jiao's gas material ratio, reduce system dynamic consumption; H in coal gas
2be conducive to again separating out of sulphur and tar in coal, be conducive to improve semicoke quality and tar yield, not only can effective cooling semicoke, also improved the utilising efficiencys of different taste energy in system, reduced energy consumption and environmental pollution.
Adopt this technology to carry out brown coal upgrading, can saving water resource, effectively improve thermo-efficiency, tar yield and caloric power of gas, reduce sulphur content and wastewater treatment capacity in semicoke, 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.Using the internal heating fluidized bed major equipment as pyrolysis, energy saving of system is efficient, and floor space is little, reduced investment, can maximize, the internal heating fluidized bed year processing power that can meet 2,000,000 tons of brown coal of 70 square metres 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 media that guarantee normal fluidization, its operating gas velocity is lower than conventional fluidized-bed, can effectively reduce material in fluidized-bed carries secretly with elutriation and loses, the corresponding load that reduces dust-removal system, its system power consumption and waste-heat rejection be corresponding minimizing 70% also, and thermo-efficiency is high.
(3) tar yield is high.Because used internal heating fluidized bed of pyrolysis is that 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 final temperature with speed faster, is conducive to tar and separates out; Simultaneously to contain a large amount of H
2heating gas be fluidisation power media, H
2existence be also conducive to tar and separate out.
(4) wastewater treatment capacity is little, and environmental protection pressure is low.By brown coal superheat steam drying and low temperature pyrogenation two-stage process, carry out brown coal upgrading, overheating steam drying process can all be recycled the water being evaporated in brown coal, and energy-saving effect is remarkable; 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 respectively the uncooled steam of outlet and the coal gas after purifying, and two processes are all oxygen-free process, coal dust free burning and explosion hazard, and security of system is reliable.
Accompanying drawing explanation
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, 3. the 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 headers, 15. flow deflectors, 16. tube sheets, 17. heat transfer tubes, 18. exhanst gas outlets, 19. air outlets, 20. burners, 21. tar are collected, 22. desulfurizers, 23. useless pots, 24. waste heat recoveries.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
In Fig. 1, a kind of 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 outlets are connected with the second cleaning apparatus, tar collection 21, desulfurizer 22, desulfurizer 22 tail gas outlets are 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 gas approach of internal heating fluidized bed pyrolysis oven 8 is sent on exhanst gas outlet one tunnel of internal heating fluidized bed pyrolysis oven 8 built-in heat exchangers back to after being connected with the exhanst gas outlet of burner 20, 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 a road and is connected with split type superheated vapour rotary dryer 3 steam inlets of endless tube after the first cleaning apparatus dedusting, and another road is connected with waste-heat recovery device 24.
Wherein, internal heating fluidized bed pyrolysis oven 8 is percolation bed form, as shown in Figure 2, comprises body of heater, and upper of furnace body is provided with air outlet 19 and is connected with the second cleaning apparatus; In body of heater, be provided with at least one group of flue gas header 14, each flue gas header 14 head and the tail connect, whole tube side is S shape, flue gas header 14 places at head and the tail are respectively equipped with gas approach 13 and exhanst gas outlet 18, in adjacent flue gas header 14, be provided with several heat transfer tubes 17, each heat transfer tube 17 two ends vertical direction are provided with tube sheet 16; In body of heater, be also provided with flow deflector 15; At lower portion of furnace body, be to spray calandria wind distribution device, by the coal gas of semicoke preheating, through air-distributing device, entered bed, material is become flexible and take volatile matter.
The 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.
The second cleaning apparatus comprises tornado dust collector II9, the ceramic multicyclone dust collector 10 setting 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 by 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 by dry coal storehouse 6, worm conveyor II7, and useless pot 23 is sent on exhanst gas outlet Zhong mono-tunnel of internal heating fluidized bed pyrolysis oven 8 built-in heat exchangers through dry coal storehouse 6; A thermal source part for the split type superheated vapour rotary dryer 3 of endless tube is from useless pot 23(waste heat boiler), a part is from the tail gas of himself.
Coal gas of high temperature booster fan 11, is arranged on semicoke cooling room 12 nearest place afterwards, guarantees that the flue-gas temperature that enters 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 ", and sealing is interior without consumable accessory.
Specific embodiment of the invention step is as follows:
(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.Rotation at the interior brown coal of the split type superheated vapour rotary dryer 3 of endless tube along with cylindrical shell is promoted by flight, offer, utilize convection current, conduction, the multiple heat exchange mode such as radiation is dried brown coal, by controlling the residence time of brown coal in the split type superheated vapour rotary dryer 3 of endless tube, be dried to after the moisture of requirement, the discharge valve of being installed by the discharge port of split type superheated vapour rotary dryer 3 afterbodys of endless tube is discharged, together with 100～120 ℃ of brown coal collecting with the discharge valve of tornado dust collector I4, be delivered to dry coal storehouse 7, through worm conveyor II7, send into internal heating fluidized bed pyrolysis oven 8.
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, by blower fan, taken out and draw, a part is returned to split type superheated vapour rotary dryer 3 recycles of endless tube, and another part enters waste-heat recovery device 24 and recycles its heat energy.
(2) dried moisture 5% brown coal are fallen in 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, by the coal gas of semicoke preheating, through spraying calandria wind distribution device, entered bed, the fluidizing medium that enters bed in this process is controlled effectively, thereby makes an interior material maintain stable fluidization.By controlling residence time in bed height, fluidizing velocity, service temperature, bed etc., make brown coal separate out fast volatile matter, 550～600 ℃ of hot semicokes that obtain, the discharge valve of being installed by the discharge port of internal heating fluidized bed pyrolysis oven 8 is discharged, together with the dry powder of collecting with tornado dust collector II9 discharge valve, be delivered to semicoke cooling room 12 cooling, a cooled semicoke part enters burner 20 burnings, and a part is delivered to finished product district and sends outside.
(3) brown coal pyrolysis is separated out volatile matter and partial material is carried by the pyrolysis gas in bed, from air outlet, flow out internal heating fluidized bed pyrolysis oven 8, after high-temperature cyclone dust extractor II9 and ceramic multicyclone dust collector 10 dedustings, through condenser condenses, separate out tar and phenol polymer, from condenser effluent air, through blower fan pressurization, deliver to tar and collect 21, desulfurizer 22(is thionizer for example) desulfurization, coal gas after desulfurization is delivered to semicoke cooling room 12 through the blower fan road of pressurizeing, after the heat exchange of high temperature semicoke, through coal gas of high temperature booster fan 11, by bottom air compartment, enter internal heating fluidized bed pyrolysis oven 8, another part enters gas holder pressurization and sends outside,
(4) flue gas one tunnel after internal heating fluidized bed pyrolysis oven 8 built-in heat exchanger heat exchange and the flue gas after coal-char combustion are mixed together after adjusting, enter again heating brown coal in internal heating fluidized bed pyrolysis oven 8 built-in heat exchangers, another road enters useless pot 23 and carries out heat exchange, the superheated vapour that useless pot 23 produces enters split type superheated vapour rotary dryer 3 steam distribution chamber of endless tube through reducing valve decompression, by the take-off pipe on it, enter in each heating tube, the water of condensation forming steam distribution indoor utilize siphon principle to discharge to enter together with the outer and water after waste-heat recovery device 24 heat exchange of the split type superheated vapour rotary dryer 3 of endless tube give up pots 23.
Claims (14)
1. an 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 the 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 coal gas of high temperature booster fan;
After being connected with the exhanst gas outlet of burner, exhanst gas outlet one tunnel of internal heating fluidized bed pyrolysis oven built-in heat exchanger sends the gas approach of internal heating fluidized bed pyrolysis oven 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 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 a road and is connected with the split type superheated vapour rotary dryer of endless tube steam inlet after the first cleaning apparatus dedusting, and another road is connected with waste-heat recovery device.
2. external-heat brown coal pyrolysis upgrading system as claimed in claim 1, is characterized in that, described internal heating fluidized bed pyrolysis oven is percolation bed form, comprises body of heater, and upper of furnace body is provided with air outlet and is connected with the second cleaning apparatus; In body of heater, be provided with at least one group of flue gas header, each flue gas header connects from beginning to end, and whole tube side is S shape, at the flue gas header place of head and the tail, is respectively equipped with gas approach and exhanst gas outlet, in adjacent flue gas header, be provided with several heat transfer tubes, each heat transfer tube two ends vertical direction is provided with tube sheet; At lower portion of furnace body, be to spray calandria wind distribution device, by the coal gas of semicoke preheating, through air-distributing device, entered bed, material is become flexible and carry volatile matter.
3. external-heat brown coal pyrolysis upgrading system as claimed in claim 1, it is characterized in that, described the 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. external-heat brown coal pyrolysis upgrading system as claimed in claim 1 or 2, it is characterized in that, described the second cleaning apparatus comprises tornado dust collector II, the ceramic multicyclone dust collector setting gradually, ceramic multicyclone dust collector is collected with tar, desulfurizer is connected, and the material that tornado dust collector II collects is sent into semicoke cooling room.
5. external-heat brown coal pyrolysis upgrading system as claimed in claim 1, is characterized in that, the split type superheated vapour rotary drying of described endless tube machine inlet capable is connected with feed bin by 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 by dry coal storehouse, worm conveyor II, and useless pot is sent on exhanst gas outlet Zhong mono-tunnel of internal heating fluidized bed pyrolysis oven built-in heat exchanger through dry coal storehouse; A thermal source part for 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. external-heat brown coal pyrolysis upgrading system as claimed in claim 1, is characterized in that, described coal gas of high temperature booster fan is arranged on semicoke cooling room nearest place afterwards, guarantees that the flue-gas temperature that enters coal gas of high temperature booster fan is not less than 350 ℃; Before coal gas of high temperature booster fan is imported and exported, should add and put expansion joint, sealed structure is " air current sealed ", and sealing is interior without consumable accessory.
7. adopt a technique for external-heat brown coal pyrolysis upgrading system claimed in claim 1, it is integrated by brown coal drying pyrolysis upgrading, it is characterized in that, concrete steps are as follows:
(1) wet brown coal are delivered to the split type superheated vapour rotary dryer of endless tube, be dried to after the moisture of requirement, discharge port by the split type superheated vapour rotary drying of endless tube drive end unit is discharged, and is delivered to internal heating fluidized bed pyrolysis oven opening for feed together with the dry powder of collecting with the tornado dust collector I of the first cleaning apparatus;
The moisture of separating out when dry and partial material are carried by the superheated vapour in the split type superheated vapour rotary dryer of endless tube, after the tornado dust collector I of the first cleaning apparatus, electric precipitator I dedusting, the recycle of the split type superheated vapour rotary dryer of endless tube is returned on one tunnel, and another road is entered waste-heat recovery device and recycled its heat energy; Drying machine water of condensation enters useless pot together with the water heating through waste-heat recovery device;
(2) dried brown coal enter and in internal heating fluidized bed pyrolysis oven, carry out fast pyrogenation section, and the semicoke of generation is discharged, and are delivered to semicoke cooling room together with the dry powder of collecting with the tornado dust collector II of the second cleaning apparatus; A cooled semicoke part enters burner combustion, and a part is delivered to finished product district and sends outside;
(3) fugitive constituent that brown coal are separated out is after the second cleaning apparatus dedusting, after condensation tar and phenol polymer, enter tar collection, desulfurizer desulfurization, it is cooling that a coal gas part after desulfurization enters semicoke cooling room, after the heat exchange of high temperature semicoke, through coal gas of high temperature booster fan, enter internal heating fluidized bed pyrolysis oven and make brown coal maintain fluidization, another part enters gas holder pressurization and sends outside; Tar after desulfurization is sent outside;
(4) flue gas one tunnel after the built-in heat exchanger heat exchange of internal heating fluidized bed pyrolysis oven and the flue gas after coal-char combustion are mixed together after adjusting, return to again heating brown coal in internal heating fluidized bed pyrolysis oven built-in heat exchanger, another road enters useless pot, and the superheated vapour of generation is as thermal source and the carrier gas of dehumidification system.
8. technique according to claim 7, is characterized in that: in described step (1), described dried coal dust temperature is 100～120 ℃.
9. technique according to claim 7, is characterized in that: in described step (1), the vapor temperature passing in the split type superheated vapour rotary dryer of endless tube is 180 ℃.
10. technique according to claim 7, is characterized in that: in described step (1), and 60～90% steam cycle utilization in the split type superheated vapour rotary drying of described endless tube tail gas, 10～40% steam is discharged drying machine.
11. techniques according to claim 7, is characterized in that: in described step (2), in the built-in heat exchanger of internal heating fluidized bed pyrolysis oven, high-temperature flue gas is 750～900 ℃.
12. techniques according to claim 7, is characterized in that: in described step (2), in described pyrolysis oven, hot semicoke dump temperature is controlled at 550～600 ℃.
13. techniques according to claim 7, is characterized in that: in described step (3), the coal gas 60～80% of discharging from desulfurizer enters the cooling semicoke of semicoke cooling room, and 20～40% enter gas holder pressurization sends outside.
14. techniques according to claim 7, is characterized in that: in described step (1), 70～80 ℃ of water of discharging from rotary dryer condensation enter useless pot together with 40～60 ℃ of water that heat through waste-heat recovery device.
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| CN104764299B (en) * | 2014-01-06 | 2018-08-28 | 山东科院天力节能工程有限公司 | Heat power fluidization evaporating separation device with external pressurized and technique |
| CN104764300B (en) * | 2014-01-06 | 2018-08-28 | 山东科院天力节能工程有限公司 | Heat power fluidization evaporating separation device and technique |
| CN106701132A (en) * | 2015-08-28 | 2017-05-24 | 李宽义 | Brown coal upgrading method through high-efficient and clean refined comprehensive utilization of coal-based energy |
| CN106118697A (en) * | 2016-08-12 | 2016-11-16 | 田东昊润新材料科技有限公司 | The brown coal continuous way coker of heat energy recycling |
| CN107760339A (en) * | 2017-11-16 | 2018-03-06 | 北京神雾电力科技有限公司 | A kind of pyrolysis gas recycling system and method |
| CN107723017A (en) * | 2017-11-29 | 2018-02-23 | 广州市新望谷环保科技有限公司 | One kind fluidisation pyrolysis oven |
| CN110500149B (en) * | 2019-09-19 | 2024-02-27 | 上海发电设备成套设计研究院有限责任公司 | Coal low-temperature carbonization and power generation co-production system |
| CN112745962B (en) * | 2019-10-31 | 2022-08-12 | 中国石油化工股份有限公司 | Vertical biomass cracking reaction device |
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