CN102994127A - Low-rank coal multi-stage fluidized bed coal chemical industry multiple production system and method - Google Patents
Low-rank coal multi-stage fluidized bed coal chemical industry multiple production system and method Download PDFInfo
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Abstract
The invention provides a low-rank coal multi-stage fluidized bed coal chemical industry multiple production system. The low-rank coal multi-stage fluidized bed coal chemical industry multiple production system comprises a fluidized bed drying furnace, a fluidized bed pyrolyzing furnace and a fluidized bed boiler, wherein the fluidized bed drying furnace, the fluidized bed pyrolyzing furnace and the fluidized bed boiler are connected in series and respectively adopt a fluidized bed form; the fluidized bed drying furnace is used for drying low-rank coal to perform physical dehydration on the low-rank coal, a tube plate heat exchanger is arranged in the fluidized bed drying furnace, the tube plate heat exchanger is immersed in the low-rank coal, and a gas heat medium in the tube plate heat exchanger is overflowed from the low-rank coal so as to carry out removed water in the low-rank coal; the fluidized bed drying furnace is connected with the fluidized bed pyrolyzing furnace, and the fluidized low-rank coal after drying enters the fluidized bed pyrolyzing furnace for performing medium and low-temperature pyrolysis in the fluidized bed pyrolyzing furnace; and the fluidized bed boiler is connected with the fluidized bed pyrolyzing furnace, and coal char generated by pyrolysis in the fluidized bed pyrolyzing furnace can enter the fluidized bed boiler for combustion.
Description
Technical field
The present invention relates to a kind of low-rank coal Coal Chemical Industry system, particularly low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme and method thereof.
Background technology
China's brown coal reserves are abundant, and brown coal output surpassed 300,000,000 tons in 2010, accounted for 10% of national coal production.The highly-efficient processing utilization of brown coal has become the problem that the coal in China energy field is shown great attention to.
Because the brown coal coalforming period is short, its water yield, oxygen level and fugitive constituent are high, and total water is up to 20-60%.Cause calorific value low on the one hand, be unsuitable for direct burning; Cause on the other hand chemical reactivity too high, very easily weathering and fragmentation is unsuitable for long distance transportation and standing storage in air.Therefore, the purposes of brown coal maximum is the generating of near coal-mine power plant, but in the brown coal volatile matter of high-quality also by the low value combustion power generation.How the high-efficiency comprehensive utilization brown coal under the prerequisite that does not affect generating, are developed efficient Coal Chemical Industry polygenerations systeme again, possess preferably economic benefit and social benefit, are problem demanding prompt solutions during brown coal utilizes.
In traditional low-rank coal circular fluid bed generation technology, all be that coal is directly burnt or pyrolysis, but the moisture one up to 30～60% contained in the low-rank coal is that direct evaporation falls, and has both wasted evaporation of water latent heat, and water resources fails again to be fully used; The 2nd, then increased the generation of pyrolytic process phenol ammonia waste water, phenol ammonia waste water intractability is large, and expense is high, brings immense pressure to environmental protection.And the coal-producing area of China all is the lack of water zone at present basically, for the water-deficient area of year millions of tons for the treatment of capacities, this is a very large waste, needs to improve technique and reclaim these moisture recyclings, reduce system energy consumption, and need to reduce the pressure of phenol ammonia waste water treatment system.
Above-mentioned fluidization refers to a large amount of solid particulates are suspended among the fluid of motion, thereby makes particle have some appearance features of fluid, and the affixed tactile state of this stream is called fluidization of solid, i.e. fluidized-bed.
The main characteristic of fluidized-bed has: abundant fluidised bed shows the character that is similar to liquid.The fluid that density ratio bed mean density is little can be suspended on the bed surface; Bed surface keeps level; Bed is obeyed the statics of fluids relation, and namely difference of altitude is the pressure reduction △ p=ρ gL of the two sections of L; Particle has with mobile like the liquid type, can be from the aperture ejection of wall; The fluidized-bed of two UNICOMs can make it on same level by Self-adjustment bed upper surface.Above-mentioned character so that the processing of fluidized-bed endoparticle material can be as fluid continuous feeding and discharging, and because particle fully mixes, bed temperature, concentration evenly make bed have unique advantage and are used widely.
Summary of the invention
In order to solve the deficiency of in the prior art low-rank coal being utilized, improve the utilization ratio of low-rank coal and reduce system energy consumption, the present inventor has proposed to adopt the multistage fluidized bed tandem to operate the method for production low-rank coal semicoke, and has proposed low order coal multistage fluidized bed Coal Chemical Industry polygenerations systeme.
The invention provides a kind of low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme, it comprises the fluidised bed drying stove, fluidized bed pyrolysis stove and fluidized-bed combustion boiler, wherein, above-mentioned fluidised bed drying stove, above-mentioned fluidized bed pyrolysis stove and above-mentioned fluidized-bed combustion boiler are connected in series, all adopt the fluidized-bed form, above-mentioned fluidised bed drying stove carries out drying to low-rank coal, so that low-rank coal physics dehydration, in above-mentioned fluidised bed drying stove, has tubular sheet heat exchanger, the aforementioned tube sheet heat exchanger is immersed in the low-rank coal, air heat medium in the aforementioned tube sheet heat exchanger overflows via low-rank coal, carries out the moisture that removes in the low-rank coal; Above-mentioned fluidised bed drying stove is connected with above-mentioned fluidized bed pyrolysis stove, and fluidised low-rank coal after drying enters above-mentioned fluidized bed pyrolysis stove, carries out middle low temperature pyrogenation in above-mentioned fluidized bed pyrolysis stove; Above-mentioned fluidized-bed combustion boiler is connected with above-mentioned fluidized bed pyrolysis stove, and the coal semicoke that pyrolysis produces in the above-mentioned fluidized bed pyrolysis stove enters above-mentioned fluidized-bed combustion boiler and burns.
In above-mentioned low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme, preferably, above-mentioned fluidized-bed combustion boiler is connected with cyclonic separator, the hot lime-ash that the flue gas that produces in the above-mentioned fluidized-bed combustion boiler obtains after above-mentioned cyclonic separator carries out cyclonic separation is sent to above-mentioned fluidized bed pyrolysis stove, and above-mentioned hot lime-ash heats the low-rank coal in the above-mentioned fluidized bed pyrolysis stove.
In above-mentioned low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme, preferred, low-rank coal is carried out drying in above-mentioned fluidised bed drying stove after, its water content is reduced to 8 ~ 15%.
In above-mentioned low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme, preferably, the low-rank coal granularity that enters above-mentioned fluidised bed drying stove is less than 10mm, enter the temperature of above-mentioned gas thermal medium of aforementioned tube sheet heat exchanger less than 180 ℃, the temperature that enters the above-mentioned gas thermal medium of above-mentioned fluidised bed drying stove from the aforementioned tube sheet heat exchanger is 140-160 ℃, temperature when low-rank coal is dewatered in above-mentioned fluidised bed drying stove is 105 ℃-115 ℃, and the temperature of producing coal of dry rear low-rank coal is less than 110 ℃.
In above-mentioned low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme, preferably, above-mentioned fluidised bed drying stove is connected with Waste Water Treatment, and the moisture of processing the evaporation generation through above-mentioned fluidised bed drying stove enters above-mentioned Waste Water Treatment, obtains liquefied ammonia, crude phenols and water through processing.
In above-mentioned low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme, preferred, the pyrolysis temperature in above-mentioned fluidized bed pyrolysis stove is controlled at 450～700 ℃.
In above-mentioned low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme, preferably, above-mentioned fluidized bed pyrolysis stove is connected with waste-heat recoverer, the rear end of above-mentioned waste-heat recoverer is connected with dedusting cooling and purifying system with above-mentioned fluidized bed dryer respectively, the pyrolysis and the volatile matter of separating out is sent to above-mentioned waste-heat recoverer in above-mentioned fluidized bed pyrolysis stove of dried low-rank coal, reclaimed the waste heat of this volatile matter by above-mentioned waste-heat recoverer, above-mentioned waste-heat recoverer is sent to above-mentioned fluidized bed dryer with the heat that reclaims, for tubular sheet heat exchanger low-rank coal is carried out dry required heat, being recovered above-mentioned volatile matter behind the waste heat is sent to above-mentioned dedusting cooling and purifying system and connects, after dedusting and cooling, obtain tar and coal gas.
In above-mentioned low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme, preferred, above-mentioned dedusting cooling and purifying system is also connecting above-mentioned Waste Water Treatment, and the waste water that contains phenol ammonia that produces in the above-mentioned dedusting cooling and purifying system is sent to above-mentioned Waste Water Treatment.
The present invention also provides a kind of low-rank coal multistage fluidized bed Coal Chemical Industry Poly-generation method, low-rank coal all keeps the form of fluidized-bed in the method, the method comprises: the low-rank coal drying step, in this step, low-rank coal is carried out drying, so that low-rank coal physics dehydration, use the mobile of air heat medium promotion low-rank coal and carry out the moisture that removes in the low-rank coal by the above-mentioned gas thermal medium, above-mentioned moisture is through processing the industrial reuse water that can access liquefied ammonia, crude phenols and meet emission standard; The low-rank coal pyrolysis step, in this step, fluidised low-rank coal is after drying carried out middle low temperature pyrogenation, and the product of low temperature pyrogenation can be coal gas, tar and low-rank coal semicoke; With the combustion power generation step, in this step, the low-rank coal semicoke that the low-rank coal pyrolysis step the produces drive steam turbine power generation that burns.
In above-mentioned low-rank coal multistage fluidized bed Coal Chemical Industry Poly-generation method, in above-mentioned combustion power generation step, produce flue gas, the hot lime-ash that above-mentioned flue gas obtains after cyclonic separation is sent to above-mentioned low-rank coal pyrolysis step, and low-rank coal is heated.
In above-mentioned low-rank coal multistage fluidized bed Coal Chemical Industry Poly-generation method, in above-mentioned low-rank coal drying step, the water content of low-rank coal is reduced to 8 ~ 15%.
In above-mentioned low-rank coal multistage fluidized bed Coal Chemical Industry Poly-generation method, in above-mentioned low-rank coal pyrolysis step, dried low-rank coal carries out pyrolysis and the volatile matter of separating out obtains the waste heat of this volatile matter through waste heat recovery, this waste heat is sent to above-mentioned low-rank coal drying step, provide low-rank coal is carried out dry required heat, be recovered the above-mentioned volatile matter behind the waste heat, after dedusting and cooling, obtain tar and coal gas.
According to the present invention, can either reclaim part moisture contained in the low-rank coal, also kept the high volatile fraction of the high-quality in the low-rank coal, obtain again to have raw gas, tar, liquefied ammonia, crude phenols of huge economic value etc., and reduced system energy consumption.
Description of drawings
Fig. 1 is low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme schematic diagram of the present invention.
Nomenclature
10: the fluidised bed drying stove; 12: Waste Water Treatment; 20: the fluidized bed pyrolysis stove; 30: fluidized-bed combustion boiler; 40: dedusting cooling and purifying system; 50: waste-heat recoverer; 60: cyclonic separator; 70 steam turbine.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further details.
Low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme of the present invention mainly comprises: fluidised bed drying stove 10, fluidized bed pyrolysis stove 20 and fluidized-bed combustion boiler 30.
Below, take brown coal as example illustrates low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme of the present invention.After brown coal enter fluidised bed drying stove 10, at first the high-moisture brown coal are carried out drying, only remove part moisture, until its water content reaches about 10%.
In fluidised bed drying stove 10, have tubular type or plate-type heat exchanger, can be referred to as tubular sheet heat exchanger, in tubular sheet heat exchanger, can pass through thermal medium, such as the high-temperature steam of high-temperature gas, high-temperature flue gas etc.In the drying process, this tubular sheet heat exchanger is immersed in the fluidised brown coal material, and the heat that utilizes air heat medium mobile in tubular sheet heat exchanger to provide is so that the brown coal thermal dehydration.And because the air heat medium that should flow can evenly overflow from tubular sheet heat exchanger, this air heat medium that flows can also promote the flowability of brown coal material, keeps the normal fluidization of the bed particle of fluidized-bed.Thereby, because the air heat medium that flows can overflow from be immersed in the tubular sheet heat exchanger of brown coal material bed, and it is material bed and keep the fluidization of coal seam particle to see through brown coal, so, in this overflow process, the air heat medium that should flow also can provide heat, thereby carries out the moisture that removes in the brown coal.
This fluidized bed drying process, can roughly be summarised as the heat transfer of air heat medium and tubular sheet heat exchanger, the heat transfer of tubular sheet heat exchanger and brown coal material, the process that water vapour breaks away from brown coal is carried in the heat transfer of air heat medium and brown coal material, brown coal thermal dehydration and air heat medium.
Behind above-mentioned fluidised bed drying stove 10, can be so that original water content be reduced to 8 ~ 15% in the water content of the raw material brown coal of 30 ~ 50wt%, most preferred state is that the water content of brown coal material is down to 10%.And, in order to ensure the fluidized of fluidized-bed, can with the brown coal granularity control that enters fluidised bed drying stove 10 less than 10mm, saturation steam be controlled at 0.6 ~ 0.8MPa(G).And, the entrance high-temperature steam temperature that enters tubular sheet heat exchanger is controlled at less than 180 ℃, to be controlled at 140-160 ℃ from the temperature that tubular sheet heat exchanger enters the air heat medium of fluidised bed drying stove 10, the temperature when brown coal are dewatered in fluidised bed drying stove 10 maintain 105 ℃-115 ℃ and so that after dry the temperature of producing coal of brown coal less than 110 ℃.And the temperature of producing coal is not limited thereto, can be according to the original moisture of coal input quantity, brown coal, remove amount of moisture and regulate control.That is, also can make the temperature of producing coal 80 ~ 95 ℃ scope.
In the above-mentioned drying process, why selecting 10% as optimum dehydration terminal point, is because this ratio can so that dried brown coal are only physically separated out moisture, can not destroyed the component of brown coal, can not cause the brown coal pyrolysis yet and separate out other materials at drying stage, cause unnecessary waste.And when dehydration when more when lower (water content be down to), heat balance is not enough, need larger heat, need to improve the hot quality of heating medium (high-temperature gas) and the temperature of heating brown coal, and improve the Heating temperature of brown coal, easily cause the Volatile in the low-rank coal.
Also therefore, ingredient is simple in the moisture that removes in this drying process, can be by reclaiming the simple rear recycling that purifies, and cost is lower.By before making brown coal material generation pyrolysis, can reduce moisture evaporates the heat that produces in the subsequent disposal system consumption thereby carry out preliminary dry reaction, reduced energy consumption; The secondth, can in this process, recycle the moisture in the low-rank coal; The 3rd, reduced the generation of phenol ammonia waste water in brown coal pyrolytic process described later, because the moisture processing cost that produces is lower, so can reduce the wastewater treatment expense in this process.
As shown in Figure 1, fluidised bed drying stove 10 is except adopting prior art to draw a small amount of steam as the heat supply by-pass from generating steam, its origin of heat also comprises the recovery heat from follow-up waste-heat recoverer 50, and, after entire system operation of the present invention, can be the main thermal source of fluidised bed drying stove 10 with this recovery hotwork, and this recovery heat can satisfy native system to the balance requirement of heat, further reduce the energy consumption of entire system.
The moisture of processing the evaporation generation through fluidised bed drying stove 10 enters Waste Water Treatment 12, obtains liquefied ammonia, crude phenols and water through processing.The final recovery that realizes liquefied ammonia and crude phenols, by physical chemistry, biochemical method the trade effluent that produces is processed, various objectionable impuritiess in the waste water are converted into innoxious substance, make its water quality standard that finally reaches national discharge water, to reduce the Production requirement that the pollution of environment is satisfied simultaneously industrial reuse water.
The drying brown coal that obtains through fluidised bed drying stove 10 processed enters fluidized bed pyrolysis stove 20, carry out pyrolysis processing, brown coal carry out middle low temperature pyrogenation in fluidized bed pyrolysis stove 20, pyrolysis temperature is controlled at about 450～700 ℃, and the treatment time is controlled at 10-30min.
Can obtain at least two kinds of products by in this fluidized bed pyrolysis stove 20, carrying out pyrolytic reaction.
A kind of is the volatile matter that brown coal are heated and pyrolysis occur and separate out, enter the dedusting cooling and purifying system 40 that these waste-heat recoverer 50 rear ends are connecting behind these volatile matter process waste-heat recoverer 50 recovery waste heats, and carry out successively dedusting and cooling, the condensable part that obtains after the cooling is tar liquid, can not condensation portion be the raw gas of high heating value.At this, tar is separated with coal gas.The tar that pyrolysis obtains can extract by processing the chemical of the high added values such as aromatic hydrocarbon, phenols, produces the liquid fuels such as gasoline, diesel oil by hydrogenation again, and the middle high heating value gas that obtains in the pyrolysis can be used as industry or civilian clean fuel.
Another kind of product is lignite semi-coke, and this lignite semi-coke is transported to fluidized-bed combustion boiler 30 and burns, and can drive steam turbine 70 generatings by burning.Fluidized-bed combustion boiler 30 can adopt existing installation.
Wherein, in the burning of fluidized-bed combustion boiler 30, except above-mentioned lignite semi-coke, also adopt hot lime-ash as its main recycle stock.The flue gas that produces through fluidized-bed combustion boiler 30 burnings is sent to cyclonic separator 60, isolate gas phase and as the hot lime-ash of solid phase through cyclonic separator 60, wherein isolate the flue gas that obtains after the solid phase and further process by conventional desulfurization or denitration or dedusting etc. and discharged by chimney.The cyclonic separation hot lime-ash as solid particulate out enters fluidized bed pyrolysis stove 20 by external circulation device, and the effect of performance thermal barrier is heated brown coal in fluidized bed pyrolysis stove 20, thereby produces lignite semi-coke.At last, the lignite semi-coke of generation is returned fluidized-bed combustion boiler 30 and burns, thereby drives steam turbine 70 generatings.Above-mentioned hot lime-ash mainly be that component is coal ash (SiO
2, CaO) and the coal dust that burns incompletely of minute quantity etc.
Wherein, above-mentioned Waste Water Treatment 12 mainly is to remove phenol, ammonia etc., obtains liquefied ammonia and crude phenols, again waste water is carried out biochemical treatment and reaches national requirements for environmental protection and discharge, obtain can qualified discharge water, thereby can take full advantage of water resources.Waste-heat recoverer 50 mainly is that the thermal source that the volatile matter that pyrolysis produces carries is recycled, and this thermal source is offered the fluidised bed drying stove, has reduced the waste of heat energy, save energy, and the energy utilization rate of raising system reduces energy consumption.Dedusting cooling and purifying system 40 mainly is by system's heat exchange cooling, so that coal tar begins condensation about 350 °, more further cooling then gets coal tar and fully separates out.Wherein uncondensable then is to comprise H
2, CH
4, CO, C
2H
2Deng the composition at interior raw gas.Isolate tar and coal gas in the volatiles, improved the output value of system.Product outside the decoking oil and gas that produces in dedusting cooling and purifying system 40 is sent to Waste Water Treatment 12, mainly is the waste water etc. that contains phenol ammonia, is further processed in Waste Water Treatment 12.
As mentioned above, by utilizing hot lime-ash as the heat hot carrier in the fluidized bed pyrolysis stove, greatly improved heat utilization rate.
Among the present invention, fluidised bed drying stove, fluidized bed pyrolysis stove and fluidized-bed combustion boiler are the operation of multistage fluidized bed tandem, cascade arrangement, in whole system, the processing at different levels all unified fluidized-bed form that adopts are processed, respectively the high-moisture brown coal are carried out drying, only remove part moisture, to about 10%; Dry rear brown coal enter the fluidized bed pyrolysis stove and carry out removing of high volatile; Last lignite semi-coke enters the fluidized-bed combustion boiler combustion power generation.Whole Coal Chemical Industry polygenerations systeme is take the tandem fluidized-bed as core, and product then is raw gas, the tar that has pretty economical to be worth take generating as primary and secondary product, its primary raw material as chemical industry can be sold, and improves the output value of system; Go back in addition a small amount of liquefied ammonia of by-product and crude phenols and the water after purifying treatment.The initial condition that removes from brown coal divides through doing the purposes such as recirculated water after the purifying treatment.
Take the generating set of 2*300MWe as example, the brown coal consumption is about 300 ~ 4,000,000 ton/years, and original moisture content is removed to 15% with 35% and calculates, but water outlet is approximately more than 600,000 ton/years.Raw gas is 500,000,000 Nm3/ approximately, 1000 ton/years respectively in crude phenols and liquefied ammonia, and tar can reach 100,000 ton/years.Hence one can see that, and the economic benefit of low order coal multistage fluidized bed Coal Chemical Industry polygenerations systeme is fabulous.
Have as can be known above-mentionedly, according to the present invention, solved in the low-rank coal valuable material such as coal tar, coal gas etc. by the huge waste of directly burning and causing; And by after drying process, carrying out pyrolytic process, avoided brown coal chemistry excessive reactivity, in air, be easy to weathering and broken problem, made it be suitable for long distance transportation and standing storage.Therefore, low order coal multistage fluidized bed Coal Chemical Industry polygenerations systeme has namely been realized the high-efficiency comprehensive utilization to brown coal, whether affects generating, possesses preferably economic benefit and social benefit.
Claims (12)
1. low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme, it is characterized in that comprising fluidised bed drying stove, fluidized bed pyrolysis stove and fluidized-bed combustion boiler, wherein, described fluidised bed drying stove, described fluidized bed pyrolysis stove and described fluidized-bed combustion boiler are connected in series, all adopt the fluidized-bed form
Described fluidised bed drying stove carries out drying to low-rank coal, so that low-rank coal physics dehydration, in described fluidised bed drying stove, has tubular sheet heat exchanger, described tubular sheet heat exchanger is immersed in the low-rank coal, air heat medium in the described tubular sheet heat exchanger overflows via low-rank coal, carries out the moisture that removes in the low-rank coal;
Described fluidised bed drying stove is connected with described fluidized bed pyrolysis stove, and fluidised low-rank coal after drying enters described fluidized bed pyrolysis stove, carries out middle low temperature pyrogenation in described fluidized bed pyrolysis stove;
Described fluidized-bed combustion boiler is connected with described fluidized bed pyrolysis stove, and the coal semicoke that pyrolysis produces in the described fluidized bed pyrolysis stove enters described fluidized-bed combustion boiler and burns.
2. low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme according to claim 1 is characterized in that:
Described fluidized-bed combustion boiler is connected with cyclonic separator, the hot lime-ash that the flue gas that produces in the described fluidized-bed combustion boiler obtains after described cyclonic separator carries out cyclonic separation is sent to described fluidized bed pyrolysis stove, and described hot lime-ash heats the low-rank coal in the described fluidized bed pyrolysis stove.
3. low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme according to claim 1 and 2 is characterized in that:
Low-rank coal is carried out drying in described fluidised bed drying stove after, its water content is reduced to 8 ~ 15%.
4. low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme according to claim 1 and 2 is characterized in that:
The low-rank coal granularity that enters described fluidised bed drying stove is less than 10mm,
Enter the temperature of described air heat medium of described tubular sheet heat exchanger less than 180 ℃, the temperature that enters the described air heat medium of described fluidised bed drying stove from described tubular sheet heat exchanger is 140-160 ℃,
Temperature when low-rank coal is dewatered in described fluidised bed drying stove is 105 ℃-115 ℃, and the temperature of producing coal of dry rear low-rank coal is less than 110 ℃.
5. low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme according to claim 1 and 2 is characterized in that:
Described fluidised bed drying stove is connected with Waste Water Treatment, and the moisture of processing the evaporation generation through described fluidised bed drying stove enters described Waste Water Treatment, obtains liquefied ammonia, crude phenols and water through processing.
6. low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme according to claim 1 and 2 is characterized in that:
Pyrolysis temperature in described fluidized bed pyrolysis stove is controlled at 450～700 ℃.
7. according to claim 1,2 or 5 described low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systemes, it is characterized in that:
Described fluidized bed pyrolysis stove is connected with waste-heat recoverer, and the rear end of described waste-heat recoverer is connected with dedusting cooling and purifying system with described fluidized bed dryer respectively,
The pyrolysis and the volatile matter of separating out is sent to described waste-heat recoverer in described fluidized bed pyrolysis stove of dried low-rank coal, reclaimed the waste heat of this volatile matter by described waste-heat recoverer, described waste-heat recoverer is sent to described fluidized bed dryer with the heat that reclaims, for tubular sheet heat exchanger low-rank coal is carried out dry required heat
Be recovered described volatile matter behind the waste heat and be sent to described dedusting cooling and purifying system and connect, after dedusting and cooling, obtain tar and coal gas.
8. low-rank coal multistage fluidized bed Coal Chemical Industry polygenerations systeme according to claim 7 is characterized in that:
Described dedusting cooling and purifying system is also connecting described Waste Water Treatment,
The waste water that contains phenol ammonia that produces in the described dedusting cooling and purifying system is sent to described Waste Water Treatment.
9. a low-rank coal multistage fluidized bed Coal Chemical Industry Poly-generation method the method is characterized in that, in the method, low-rank coal keeps the form of fluidized-bed, and the method comprises:
The low-rank coal drying step, in this step, low-rank coal is carried out drying, so that low-rank coal physics dehydration, use the mobile of air heat medium promotion low-rank coal and carry out the moisture that removes in the low-rank coal by described air heat medium, described moisture is through processing the industrial reuse water that can access liquefied ammonia, crude phenols and meet emission standard;
The low-rank coal pyrolysis step, in this step, fluidised low-rank coal is after drying carried out middle low temperature pyrogenation, and the product of low temperature pyrogenation can be coal gas, tar and low-rank coal semicoke; With
The combustion power generation step, in this step, the low-rank coal semicoke that the low-rank coal pyrolysis step the produces drive steam turbine power generation that burns.
10. low-rank coal multistage fluidized bed Coal Chemical Industry Poly-generation method according to claim 9 is characterized in that:
Produce flue gas in described combustion power generation step, the hot lime-ash that described flue gas obtains after cyclonic separation is sent to described low-rank coal pyrolysis step, and low-rank coal is heated.
11. according to claim 9 or 10 described low-rank coal multistage fluidized bed Coal Chemical Industry Poly-generation methods, it is characterized in that: in described low-rank coal drying step, the water content of low-rank coal is reduced to 8 ~ 15%.
12. according to claim 9 or 10 described low-rank coal multistage fluidized bed Coal Chemical Industry Poly-generation methods, it is characterized in that:
In described low-rank coal pyrolysis step, the volatile matter that dried low-rank coal pyrolysis is separated out carries out waste heat recovery, obtains the waste heat of this volatile matter, and this waste heat is sent to described low-rank coal drying step, provide low-rank coal is carried out dry required heat,
Be recovered the described volatile matter behind the waste heat, after dedusting and cooling, obtain tar and coal gas.
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| CN103773398A (en) * | 2014-01-15 | 2014-05-07 | 李伟 | Rotary heat exchange retorting equipment |
| CN103939158A (en) * | 2014-05-09 | 2014-07-23 | 湖南华银能源技术有限公司 | Low-rank coal purification power generation system |
| CN104403680B (en) * | 2014-09-26 | 2017-07-14 | 中国科学院过程工程研究所 | The two-fluid cycle generating system and method for the predrying pyrolysis staged conversion of low-order coal |
| CN110847991A (en) * | 2019-11-20 | 2020-02-28 | 西安交通大学 | Solar-driven lignite poly-generation power generation system and operation method |
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| CN103525463A (en) * | 2013-10-18 | 2014-01-22 | 中国天辰工程有限公司 | Novel process for drying lignite |
| CN103773398A (en) * | 2014-01-15 | 2014-05-07 | 李伟 | Rotary heat exchange retorting equipment |
| CN103773398B (en) * | 2014-01-15 | 2016-08-31 | 李伟 | A kind of revolution heat exchange distillation apparatus |
| CN103939158A (en) * | 2014-05-09 | 2014-07-23 | 湖南华银能源技术有限公司 | Low-rank coal purification power generation system |
| CN103939158B (en) * | 2014-05-09 | 2015-10-07 | 湖南华银能源技术有限公司 | A kind of low-order coal purification power generation system |
| CN104403680B (en) * | 2014-09-26 | 2017-07-14 | 中国科学院过程工程研究所 | The two-fluid cycle generating system and method for the predrying pyrolysis staged conversion of low-order coal |
| CN110847991A (en) * | 2019-11-20 | 2020-02-28 | 西安交通大学 | Solar-driven lignite poly-generation power generation system and operation method |
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