CN105623689A - Coal pyrolysis system - Google Patents
Coal pyrolysis system Download PDFInfo
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- CN105623689A CN105623689A CN201610193056.2A CN201610193056A CN105623689A CN 105623689 A CN105623689 A CN 105623689A CN 201610193056 A CN201610193056 A CN 201610193056A CN 105623689 A CN105623689 A CN 105623689A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
- B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
- C10K1/024—Dust removal by filtration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
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- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Coke Industry (AREA)
Abstract
The invention provides a coal pyrolysis system. The coal pyrolysis system comprises a rotary radiation bed, a semi-coke cooling device, a semi-coke screening device and a hot air furnace; a coal feeing port, a heat medium inlet, a semi-coke outlet and a raw coal gas outlet are formed in the rotary radiation bed; the semi-coke cooling device comprises a cooling inlet and a cooling outlet, and the semi-coke outlet is communicated with the cooling inlet; the semi-coke screening device comprises a screening inlet and a first screening outlet, and the screening inlet is communicated with the cooling outlet; a semi-coke inlet and a hot air exhaust port are formed in the hot air furnace; the semi-coke inlet is communicated with the first screening outlet; the hot air exhaust port is communicated with the heat medium inlet in the rotary radiation bed. By fully utilizing heat generated the combustion of a semi-coke with smaller particle size as a heat supply unit, not only is the problem of difficult semi-coke processing solved, but also the heat exchange efficiency between the heat supply unit and the rotary radiation bed is improved; not only is the system simplified, but also the integrated coal and semi-coke treatment is realized; conditions are created for an integrated technology of coal, oil and gas.
Description
Technical field
The present invention relates in clean coal chemical field, specifically, it relates to a kind of pyrolysis of coal system.
Background technology
Foam coal is the byproduct that must produce in progress of coal mining, and adopts modern performing comprehensive coal mining equipment also to increase the output of foam coal. China is relatively strong to the dependency of coal resources at present, less gradually along with fat coal resource, and low-rank coal development of resources and clean utilization to foam coal and so on are paid attention to gradually. But, in current published technology, no matter it is the technology such as coal liquifaction, coal preparing natural gas, ammonia from coal, or by the technology of low temperature, middle gentle high temperature coke, the particle of the raw coal of employing is substantially at more than 25mm, and for being less than, 25mm foam coal is more difficult. Causing foam coal bulk deposition, cannot produce economic benefit, cause new environmental issue simultaneously, therefore, the clean utilization of foam coal has become the difficult problem that is needed badly solution.
Prior art is for, in the treatment process of coal dust, the clean and effective that coal pyrolysis technique can realize foam coal utilizes, and pyrolysis product has tar, pyrolysis coal gas, high heating value semicoke. Currently there will be a known multiple coal pyrolysis technology, it is known that pyrolytic technique mainly comprise: the methods such as thermal barrier direct heating method for pyrolysis, flue gas direct heating method, indirect heating method, circular fluid bed and pyrolysis coupling system. But, all there is certain defect in existing coal pyrolysis technology, it is difficult to realizes large industrialized and produce.
Solid heat carrier pyrolysis method belongs to typical method for pyrolysis, grows up abroad the earliest, and it is studied and promotes by domestic Dalian University of Technology. Conventional thermal barrier has Ceramic Balls, quartz sand, semicoke etc., thermal barrier is heated between 650-750 DEG C by heating system, by handling machinery, thermal barrier is delivered in pyrolysis reactor, high-temperature heat carrier and raw material short mix, heat transfer, raw material is heated to 500 DEG C, completes pyrolytic reaction in 2-10min, has reacted rear semicoke and has been separated by special device with thermal barrier, thermal barrier is sent to heating system heating cycle and utilizes, semicoke stores after cooling, if adopting semicoke need not be separated as thermal barrier, it is necessary to quantitatively carry. This technology obtains gas heating value height, and calorific value can reach 16MJ-40MJ/m3. But, this kind of rapid pyrolysis method system complex, power consumption is high, and thermal barrier and semicoke isolation technique are more difficult, cause tar product poor quality.
The most typically vertical heater method in gas direct heating method, project is more at home at present, but device unit processing power is limited, and current maximum processing capability is year 500000 tons/year (7200 hours). Vertical heater method is vertical continuous stove, is followed successively by drying layer from top to bottom, pre-pyrolysis layer, pyrolysis layer, cooling layer etc. four layers. High temperature not oxygen gas lead in stove bottom vertical heater, go with coal anti-phase. Carrying out heat exchange with the coal declined in high temperature not oxygen gas uphill process, be heated to about 500 DEG C at pyrolysis layer coal, pyrolysis gas and high temperature is the mixed raw gas continuation rising of oxygen gas not, and heat passes to coal. At gas outlet, raw gas temperature is generally about 100 DEG C. The tar that raw gas cooling is collected is as product stock, and pyrolysis gas part is recycled to combustion chamber and produces high-temperature flue gas, and part is carried as product. The semicoke fallen from pyrolysis layer continues to drop to cooling section, carries out water-cooled or dry calibration. The method requires that more than 6mm particulate coal block is as raw material, is not suitable for foam coal, and pyrolysis gas calorific value is lower, and semicoke calorific value differs greatly.
Circular fluid bed and pyrolysis coupling system have large-scale experiment project at present, substantially do not have industrialization promotion. Basic step is: adopting high-temperature boiler coal ash raw coal to be carried out direct heating, high temperature coal ash and coal short mix in reactor, heat transfer, completes pyrolytic reaction. The method and high-temperature heat carrier method are similar, but need pyrolysis to be built in power plant or has near large-scale Fluidized Bed Boiler, thus promote being restricted.
Prior art also discloses the external-heating revolving gas retort that one prepares blue charcoal (semicoke), from barrel front end charging, rear end discharging is discharging combination sealing between feed box and cylinder, and cylinder outside is the heat-carrier passage closed being made up of chuck sealing and chuck. Heat smoke is as thermal barrier, and flue gas is in flow forward process and transfers heat to coal by cylinder, and coal, after absorbing heat, series reaction occurs. The ability that the method heat interchanging area expands is limited, economic poor performance.
In summary, all there is certain defect in pyrolysis of coal technique of the prior art, therefore, is badly in need of the pyrolysis of coal system to prior art and improves.
Summary of the invention
The main purpose of the present invention is to provide a kind of pyrolysis of coal system, to provide a kind of equipment to simplify the pyrolysis of coal system high with economic performance.
In order to realize above-mentioned purpose, according to an aspect of the present invention, provide a kind of pyrolysis of coal system, this pyrolysis of coal system comprises: rotatable radiation bed, Semi-coke cooling device, semicoke screening plant and hotblast stove, wherein, rotatable radiation bed is provided with coal opening for feed, thermal medium inlet, semicoke outlet and raw gas outlet; Semi-coke cooling device comprises cooling entrance and coolant outlet, and semicoke outlet is connected with cooling entrance; Semicoke screening plant comprises screening entrance and is connected with coolant outlet with the first screening outlet screening entrance; Hotblast stove, hotblast stove is provided with semicoke import and hot blast venting port, and semicoke import is connected with the first screening outlet, and hot blast venting port is connected with the thermal medium inlet in rotatable radiation bed.
Further, rotatable radiation bed being also provided with thermal medium outlet, thermal medium outlet is connected with thermal medium inlet by the first blower fan.
Further, the hot blast venting port on hotblast stove is connected with the thermal medium inlet in rotatable radiation bed by hot blast input channel, and the first blower fan is connected with hot blast input channel.
Further, pyrolysis of coal system also comprises raw gas cleaning apparatus, raw gas cleaning apparatus comprises raw gas entrance, purification raw gas outlet and the outlet of semicoke dust, raw gas entrance is connected with the raw gas outlet in rotatable radiation bed, and the outlet of semicoke dust is connected with the semicoke import on hotblast stove.
Further, pyrolysis of coal system also comprises the 2nd blower fan, and the 2nd blower fan is connected with the semicoke transport pipe being arranged between the first screening outlet and semicoke import.
Further, the outlet of semicoke dust is connected with semicoke transport pipe.
Further, hotblast stove comprises: combustion chamber and settling pocket, and combustion chamber is provided with burner, combustion-supporting wind inlet and semicoke import; Settling pocket and combustion chamber, settling pocket is provided with flue-dust retainer and hot blast venting port.
Further, combustion chamber is connected with the bottom of settling pocket, and hot blast venting port is positioned at the top of settling pocket, and flue-dust retainer is positioned at the bottom of settling pocket.
Further, combustion chamber is connected with the top of settling pocket, is provided with one or more windsheild in settling pocket, forms the air-guiding aisle of bending between windsheild and the inwall of settling pocket, and hot blast venting port is positioned at the side away from combustion chamber of settling pocket.
Further, in hotblast stove, the path between combustion chamber and settling pocket is also provided with mixing section, mixing section is provided with and regulates wind inlet mouth.
Further, pyrolysis of coal system also comprises cooling spiral handling machinery, and the outlet of semicoke dust is connected with semicoke transport pipe by cooling spiral handling machinery.
Further, pyrolysis of coal system also comprises wind stopping device, and wind stopping device is arranged on the semicoke powder transfer pipelines between the outlet of semicoke dust and cooling spiral handling machinery along the throughput direction of semicoke dust.
Further, pyrolysis of coal system also comprises tar coal gas separating unit, and tar coal gas separating unit is connected with raw gas cleaning apparatus by purification raw gas outlet.
Further, coolant outlet is connected by cooling semicoke transport pipe with screening entrance, and cooling semicoke transport pipe is also provided with blow-off valve.
Further, pyrolysis of coal system also comprises storage bin, and storage bin is connected with the coal opening for feed in rotatable radiation bed by feeding screw.
Further, semicoke screening plant also comprises the 2nd screening outlet, and the particle diameter of the semicoke that the first screening outlet exports is less than the particle diameter of the semicoke that the 2nd screening outlet exports.
The technical scheme of application the present invention, quenching is carried out through refrigerating unit by high-temperature semi-coke pyrolysis of coal produced, then (below 2mm) semicoke less for the particle diameter being difficult to process is fed in hotblast stove and burns, and the high-temperature flue gas that burning produces is returned the heat of rotatable radiation bed as pyrolysis of coal. Such set-up mode is conducive to the heat making full use of the less coal-char combustion generation of particle diameter as heating unit, not only solve the problem that semicoke process is difficult, and the heat exchange efficiency that improve between heating unit and rotatable radiation bed, both simplified system, achieves again the close-coupled processing of coal and semicoke. In addition, this pyrolysis of coal system heat exchange efficiency height, equipment is simple and good economy performance, for realize coal, oil, gas multi-production process create condition.
Accompanying drawing explanation
The Figure of description of the part forming the application is used to provide a further understanding of the present invention, and the schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention. In the accompanying drawings:
Fig. 1 shows the pyrolysis of coal system schematic of a kind of preferred embodiment according to the present invention; And
Fig. 2 shows the structural representation according to hotblast stove in an embodiment of the present invention;
Fig. 3 shows the structural representation according to hotblast stove in the present invention's another kind of embodiment;
Fig. 4 shows the structural representation of the combustion chamber according to hotblast stove in an embodiment of the present invention;
Fig. 5 shows the structural representation according to raw gas cleaning apparatus in a preferred embodiment of the present invention; And
Fig. 6 shows the decontamination chamber in the raw gas cleaning apparatus shown in Fig. 5 and structure of filtering layer schematic diagram.
Wherein, above-mentioned accompanying drawing comprises the following drawings mark:
10, rotatable radiation bed; 20, Semi-coke cooling device; 30, semicoke screening plant; 40, hotblast stove; 50, raw gas cleaning apparatus; 60, tar coal gas separating unit;
101, coal opening for feed; 102, thermal medium inlet; 103, semicoke outlet; 104, raw gas outlet; 105, thermal medium outlet;
201, entrance is cooled; 202, coolant outlet;
301, entrance is sieved; 302, the first screening outlet;
401, semicoke import; 402, hot blast venting port;
501, raw gas entrance; 502, raw gas outlet is purified; 503, semicoke dust outlet; 504, purge gas entrance;
51, decontamination chamber; 52, filtering layer; 53, gas pipeline; 521, filter plate; 522, filter material layer; 5221, the first filter material layer; 5222, the 2nd filter material layer;
41, combustion chamber; 411, burner; 412, lighter for ignition; 413, combustion-supporting wind inlet; 414, slag-drip opening;
42, settling pocket; 421, flue-dust retainer; 422, windsheild;
11, the first blower fan; 12, the 2nd blower fan; 13, cooling spiral handling machinery; 14, wind stopping device; 15, blow-off valve; 16, storage bin; 17, feeding screw.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually. Below in conjunction with embodiment, the present invention is described in detail.
As background section mentioned, pyrolysis of coal system complex of the prior art and economic poor-performing, for improving this situation, in a kind of typical enforcement mode of the present invention, providing a kind of pyrolysis of coal system, as shown in Figure 1, this pyrolysis of coal system comprises: rotatable radiation bed 10, Semi-coke cooling device 20, semicoke screening plant 30 and hotblast stove 40, wherein, rotatable radiation bed 10 is provided with coal opening for feed 101, thermal medium inlet 102, semicoke outlet 103 and raw gas outlet 104; Semi-coke cooling device 20 comprises cooling entrance 201 and coolant outlet 202, and semicoke outlet 103 is connected with cooling entrance 201; Semicoke screening plant 30 comprises screening entrance 301 and is connected with coolant outlet 202 with the first screening outlet 302 screening entrance 301; And hotblast stove 40 is provided with semicoke import 401 and hot blast venting port 402, semicoke import 401 is connected with the first screening outlet 302, and hot blast venting port 402 is connected with the thermal medium inlet 102 in rotatable radiation bed 10.
The above-mentioned pyrolysis of coal system of the present invention, comprise the rotatable radiation bed 10, Semi-coke cooling device 20, semicoke screening plant 30 and the hotblast stove 40 that are connected successively, quenching is carried out through Semi-coke cooling device 20 by high-temperature semi-coke pyrolysis of coal produced, by semicoke screening plant 30 less (below the 2mm) semicoke of particle diameter being difficult to process is fed in hotblast stove 40 and burns, and the high-temperature flue gas that burning produces is returned the heat of rotatable radiation bed 10 as pyrolysis of coal. Such set-up mode is conducive to the heat making full use of the less coal-char combustion generation of particle diameter as heating unit, not only solves the problem that semicoke process is difficult, and the heat exchange efficiency that improve between heating unit and rotatable radiation bed 10. Carry out the pyrolysis of coal system of combustion heat supplying after being gasified by semicoke in compared to existing technology again with the form of gas, the above-mentioned pyrolysis of coal system simplified apparatus of the present invention, achieve again the close-coupled processing of coal and semicoke. And, this pyrolysis of coal system heat exchange efficiency height, equipment is simple and good economy performance, does not limit by coal, can carry out the pyrolysis processing of multiple coal, for realize coal, oil, gas multi-production process create condition.
In above-mentioned pyrolysis of coal system, rotatable radiation bed preferably adopts the rotatable radiation bed of radiator tube indirect heating, it is more preferable to for organizing radiator tube pyrolysis rotary kiln, rotary kiln inside has organizes radiator tube more more, tube spacing is greater than the diameter of largest particle in kiln material, gets stuck to avoid causing. Kiln head and the kiln tail of rotary kiln have rforated plate bracing, feed end (kiln tail) and discharge end (kiln head) have certain angle of inclination (general feed end is higher than discharge end), this range of tilt angles is at 1 �㡫5 ��, it is possible to realize in material kiln mobile fast. Radiator tube pyrolysis rotary kiln adopts indirect heating mode so that heating carrier is easily separated with semicoke; Many group radiator tubes ensure the abundant pyrolysis of material, caloric power of gas height, unit year processing power reach as high as 1,500,000 tons, and by the restriction of coal, be suitable for carrying out the pyrolysis of coal of industrialization.
In above-mentioned pyrolysis of coal system, Semi-coke cooling device 20 adopts existing dry coke quenching equipment. In a kind of preferred embodiment of the present invention, above-mentioned Semi-coke cooling device 20 (not shown) is vertical structure, having housing, comprise the Multi-layer exchanging heat pipe being arranged in housing and the drum being arranged on outside housing, wherein heat transfer tube has entrance of cooling water and vapour outlet. Wherein, the flow direction of heat transfer tube inner cooling water is contrary with the flow direction of semicoke, along with the thermal exchange with high-temperature semi-coke, semicoke decrease in temperature, temperature of cooling water raises and turns into hot steam gradually, not only increase the cooling performance to semicoke, and the hot steam reclaimed can also carry out heat recovery and utilization or use as plant area domestic hot-water.
Above-mentioned Semi-coke cooling device adopts partition tubular type heat transfer tube and forces water cycle principle of work, device interior has Multi-layer exchanging heat pipe, water coolant is by entering in heat transfer tube bottom waste heat boiler, by the high-temperature semi-coke heat exchange of the outer flowing of tube wall and pipe, the steam generated enters drum, steam quality can adjust, and can be low-pressure steam or middle pressure steam. Its actual moving process can be as follows: directly enters in dry coke quenching equipment from the high-temperature semi-coke of the semicoke of rotatable radiation bed 10 outlet 103 output, in dry coke quenching equipment, soft water enters from lowest layer heat transfer tube, flow from bottom to top, with high-temperature semi-coke reverse heat-exchange from top to bottom, semicoke temperature is made to be reduced to less than 150 DEG C from 550 DEG C, after cooling, semicoke delivers to semicoke screening plant 30, being delivered to by the semicoke particle of below 2mm carries out as fuel in hotblast stove 40, the semicoke particle of more than 2mm is as product stock.
Semicoke after the cooling of above-mentioned Semi-coke cooling device is needed for cooling performance, can also cool through cooling spiral transfer roller, in the screw conveyor shaft of this cooling spiral transfer roller, there is water-cooled tube, housing is outside equipped with water-cooling jacket, the spray that can directly lower the temperature can also be set as required in housing and drench element, with by indirectly semicoke being cooled with direct cooling method.
When above-mentioned interchanger and above-mentioned cooling spiral transfer roller use jointly as the refrigerating unit of semicoke, air is had to enter or coal gas leakage for preventing from being connected between two cooling apparatuss, in the preferred embodiment of the present invention another kind, above-mentioned cooling spiral transfer roller can be set to the varying pitch that pitch word opening for feed changes from small to big to discharge port, or the disconnected pitch being set to middle vacancy one end screw shaft, can improve sealing property.
In above-mentioned pyrolysis of coal system, semicoke screening plant can according to for the size choose reasonable screening plant of semicoke of burning. In order to improve the quality of semicoke product, reducing the content of difficult semicoke, in a kind of preferred embodiment of the present invention, semicoke screening plant is set to sieve out the semicoke of below 2mm, to solve the difficult problem of the little semicoke of particle diameter.
Above-mentioned pyrolysis of coal system, the high-temperature flue gas utilizing Combustion of Hot Air Furnace semicoke to produce is sent in rotatable radiation bed through thermal medium entrance, as thermal source, coal is carried out pyrolysis. In order to the low-temperature flue gas after the high-temperature flue gas heat exchange in further contrarotating radiation bed carries out recycle, in a kind of preferred embodiment of the present invention, also being provided with thermal medium outlet 105 in above-mentioned rotatable radiation bed 10, thermal medium outlet 105 is connected with thermal medium inlet 102 by the first blower fan 11. More preferably, the hot blast venting port 402 on hotblast stove 40 is connected with the thermal medium inlet 102 in rotatable radiation bed 10 by hot blast input channel, and the first blower fan 11 is connected with hot blast input channel.
In above preferred embodiment, the first blower fan is flue gas recirculation blower fan, it is necessary to heatproof 250-450 DEG C, is thus preferably high-temperature blower. The low-temperature flue gas that the thermal medium outlet 105 of the rotation type radiation bed 10 exported with the first blower fan 11 by hotblast stove high-temperature flue gas out is discharged mixes, and reduces the oxygen content of high-temperature flue gas on the one hand, reduces security risk; On the other hand the low-temperature flue gas that hotblast stove 40 high-temperature flue gas out is discharged with rotatable radiation bed 10 is mixed, it is beneficial to the temperature that the temperature reducing high-temperature flue gas improves low-temperature flue gas simultaneously so that the temperature entering the hot kiln of coal is more suitable for, and then raising thermo-efficiency.
The pyrolysis of coal system of the present invention also comprises raw gas cleaning apparatus 50, raw gas cleaning apparatus 50 comprises raw gas entrance 501, purification raw gas outlet 502 and semicoke dust outlet 503, raw gas entrance 501 is connected with the raw gas outlet 104 in rotatable radiation bed 10, and semicoke dust outlet 503 is connected with the semicoke import 401 on hotblast stove 40.
In above preferred embodiment, by utilizing the semicoke dust in raw gas that raw gas cleaning apparatus contrarotating radiation bed produces to remove, with the combustion heat value of purified gas improved in raw gas, improve the quality of tar simultaneously. It is connected with the semicoke import 401 on hotblast stove 40 by semicoke dust is exported 503, the semicoke dust being difficult to process produced in pyrolysis of coal process is entered in hotblast stove burn, not only increase the heat supply of hotblast stove, and decrease the secondary treatment of semicoke dust, simplify system, it is to increase the economic performance of whole pyrolysis of coal system. Further, from cleaning apparatus hot blast out, dustiness is lower, it is possible to reduce the dustiness of high-temperature flue gas after burning, it is to increase heat exchange efficiency.
In the present invention's another kind of preferred embodiment, the raw gas cleaning apparatus 50 in above-mentioned pyrolysis of coal system is grain bed fly-ash separator. Preferably this grain bed fly-ash separator is except comprising above-mentioned raw gas entrance 501, purification raw gas outlet 502 and semicoke dust outlet 503, as shown in Figure 5, also comprise: decontamination chamber 51 and filtering layer 52, filtering layer 52 is arranged on the upper end of decontamination chamber 51 and is connected with decontamination chamber 51, and decontamination chamber 51 is provided with purification raw gas outlet 502 and purge gas entrance 504. Decontamination chamber 51 can be one or more, and when decontamination chamber 51 is multiple, the first end of multiple decontamination chamber 51 is arranged in the inner walls of grain bed fly-ash separator, and two end relative with first end of multiple decontamination chamber 51 forms the center-aisle that semicoke dust falls.
More preferably, as shown in Figure 6, above-mentioned filtering layer 52 comprises: filter plate 521, filter material layer 522, filter material layer 522 is arranged on filter plate 521, the weight that filter material layer 522 comprises density or the first filter material layer that the density of the first filter material layer 5221 and the 2nd filter material layer 5222, first filter material layer is less than the 2nd filter material layer is greater than the weight of the 2nd filter material layer. Specifically, the density of the first layer filtrate is very little, is 70-200kg/m3, the second layer is density is 1800kg/m3, i.e. lightness sensation in the upper and heaviness in the lower. More preferably, above-mentioned first filter material layer and the 2nd filter material layer can be respectively perlite and quartz sand, hollow ceramic ball and quartz sand or semicoke particle and quartz sand. Filter plate can be the stainless steel needle silk felt of resistance to 600 DEG C of high temperature. There are above-mentioned two layers of filtering layer having filtrate that is not congruent or density and being formed, efficiency of dust collection can be significantly improved.
In above-mentioned pyrolysis of coal system, first screening outlet 302 and semicoke import 401, and the concrete connecting passage between semicoke dust outlet 503 and semicoke import 401 can carry out rationally according to the practical situation in actual production, as long as the semicoke being less than 2mm can realize and semicoke dust can enter and carries out in hotblast stove burning. In a kind of preferred embodiment of the present invention, above-mentioned pyrolysis of coal system also comprises the 2nd blower fan the 12, two blower fan 12 and is connected with the semicoke transport pipe being arranged between the first screening outlet 302 and semicoke import 401. More preferably, semicoke dust outlet 503 is connected with semicoke transport pipe.
In above preferred embodiment, 2nd blower fan 12 is commonly referred to powder feeding blower fan, utilize the 2nd blower fan 12 that semicoke is sent in hotblast stove 40 burning to generate high-temperature flue gas and send in rotatable radiation bed 10 and heat is provided, and, semicoke dust outlet 503 being connected with semicoke transport pipe also can by means of the pressure of the 2nd blower fan 12 by burning in semicoke dust feeding hotblast stove 40. Arrange like this can the pressure of circulated gases in overall improved system, thus avoid the dust in high-temperature flue gas to block the hot media channel of rotatable radiation bed 10, or the problem that the heat exchange efficiency that causes on hot media channel of dust adhesion is poor.
In above-mentioned pyrolysis of coal system, hotblast stove is can the heating plant of burning solid semicoke, can be burnt below 2mm semicoke foam, or semicoke fine powder (semicoke dust), and concrete hotblast stove can be vertical fluidized-bed or vertical powder body stove or can be horizontal powder body stove. Thus, any hotblast stove that can realize above-mentioned functions is all applicable to the present invention. In a kind of preferred embodiment of the present invention, as shown in Figures 2 to 4, above-mentioned hotblast stove 40 comprises: combustion chamber 41 and settling pocket 42, and combustion chamber 41 is provided with burner 411, combustion-supporting wind inlet 413 and semicoke import 401; And settling pocket 42 is connected with combustion chamber 41, settling pocket 42 is provided with flue-dust retainer 421 and hot blast venting port 402.
In above-mentioned preferred embodiment, by being provided with combustion chamber 41 and the hotblast stove of settling pocket 42, semicoke enters combustion chamber 41 from semicoke import 401, the semicoke in combustion chamber is burnt by burner 411, combustion-supporting wind inlet can be air intlet, and air is sent in hotblast stove as the burning of semicoke in combustion chamber provides oxygen by burner blower by combustion-supporting wind inlet. The setting of settling pocket 42 be in order to sedimentation burn after high-temperature flue gas in dust, to reduce the grey particle concentration of the high-temperature flue gas entered in rotatable radiation bed, and then avoid the dust in high-temperature flue gas to block the hot media channel of rotatable radiation bed 10, or dust adhesion is on hot media channel, thus improve the heat exchange efficiency in rotatable radiation bed 10.
In actual mechanical process, concrete technique can be as follows: below 2mm semicoke particle is from the first screening outlet 302 discharge, it is sent in hotblast stove 40 by the 2nd blower fan 12, Thorough combustion under the effect of burner blower, combustion chamber 41 temperature can reach 1200 DEG C��1400 DEG C, in flue gas, ash rate is higher, and then high-temperature flue gas carries out dedusting by settling pocket 42, and ash content in flue gas is reduced to processing requirement. After dedusting, flue-gas temperature is higher, higher than processing requirement temperature, now the low-temperature flue gas of kiln tail is delivered to by the first blower fan 11 hot blast input channel inner, carrying out temperature adjustment, high-temperature flue-gas is down to 800��1000 DEG C, high-temperature flue gas enters in radiator tube rotary kiln, after completing heat exchange, part low-temperature flue gas is again delivered to by the first blower fan 11 and is carried out temperature adjustment in hot blast input channel, and another part low-temperature flue gas goes to fume treatment auxiliary, is separately used as him.
In order to the grey particle concentration reduced further in the high-temperature flue gas after burning, in a kind of preferred embodiment of the present invention, as shown in Figure 2, above-mentioned combustion chamber 41 is connected with the bottom of settling pocket 42, and hot blast venting port 402 is positioned at the top of settling pocket 42, flue-dust retainer 421 is positioned at the bottom of settling pocket 42. By the bottom that heat smoke discharge direction is set to, make high-temperature flue gas in discharge process, utilize action of gravity that dust drops to the bottom of settling pocket 42, then utilize flue-dust retainer 421 to be discharged by dust, thus decrease the grey particle concentration in the high-temperature flue gas of hotblast stove 40 discharge.
The horizontal hot air furnace of above-mentioned preferred embodiment, the high-temperature flue gas produced from combustion chamber 41 can enter from the bottom of settling pocket 42, upwards moves to the hot blast venting port 402 at settling pocket 42 top in rotation direction. In the process that rotation direction is upwards run, the macrobead dust in high-temperature flue gas can more easily fall such that it is able to improves the purification rate of high-temperature flue gas further.
In the present invention's another kind of preferred embodiment, as shown in Figure 3, combustion chamber 41 is connected with the top of settling pocket 42, settling pocket 42 is provided with one or more windsheild 422, the air-guiding aisle of bending is formed, and hot blast venting port 402 is positioned at the side away from combustion chamber 41 of settling pocket 42 between the inwall of windsheild 422 and settling pocket 42.
In above-mentioned preferred embodiment, utilize the air-guiding aisle forming bending between the inwall of windsheild 422 and settling pocket 42, the high-temperature flue gas song in settling pocket 42 produced in combustion chamber 41 can be made to be forwarded to hot blast venting port 402, song march forward and windsheild 422 barrier effect under, the macrobead in high-temperature flue gas is more conducive to making to settle down, with the dustiness reduced further in flue gas, it is to increase the heat exchange efficiency of follow-up rotatable radiation bed 10.
In another kind of preferred embodiment, in above-mentioned hotblast stove 40, the path between combustion chamber 41 and settling pocket 42 is also provided with mixing section, mixing section is provided with and regulates wind inlet mouth. Path between combustion chamber 41 and settling pocket 42 arranges mixing section, high-temperature flue gas can be made to mix with the adjustment wind regulating wind inlet mouth to enter, to adjust the temperature of high-temperature flue gas and the oxygen level (its oxygen level can be made lower than 5%) of the inside that burning generates, thus improve the security of equipment further.
In a kind of preferred embodiment, the bottom of combustion chamber 41 is provided with one or more slag-drip opening 414, is provided with one or more first ash discharging hole bottom the flue-dust retainer 421 of settling pocket 42.
In addition, combustion chamber 41 can arrange multiple burner 411 and the multiple lighter for ignitions 412 mated mutually with it, combustion-supporting wind inlet 413 and semicoke import 401. And the distribution of multiple burner 411 can be different directions, such as can along the radial array of combustion chamber 41 or axial array. The flame of concrete burner 411 is towards adjusting, and such as radial flame burning or tangential flame as shown in Figure 4 are burnt.
In the above-mentioned pyrolysis of coal system of the present invention, the semicoke dust temperature of semicoke dust outlet 503 discharge of raw gas cleaning apparatus 50 is higher, can realize sending in hotblast stove 40 semicoke dust by the 2nd high temperature resistant blower fan 12. But in order to reduce the danger of high temperature service, improve processing safety and suitability further, in another preferred embodiment of the present invention, above-mentioned pyrolysis of coal system also comprises cooling spiral handling machinery 1313, and semicoke dust outlet 503 is connected with semicoke transport pipe by cooling spiral handling machinery 13.
By high-temperature semi-coke dust that raw gas cleaning apparatus is discharged after cooling spiral transfer roller cools, it is convenient to utilize and uses conventional equipment to be carried by the semicoke fine powder after cooling, it is to increase the stability of processing safety and conveying. Wherein, cooling spiral handling machinery 13 adopts conventional cooling spiral transfer roller also can realize the effect that semicoke dust is lowered the temperature, in order to improve cooling-down effect further, in the present invention's another kind of preferred embodiment, indirectly cold mode is preferably adopted to be cooled by the semicoke dust of high temperature, wherein, cooling spiral handling machinery 13 comprises spiral conveying tube, the outside of spiral conveying tube has water jacket, water jacket has soft water import and vapour outlet, generate steam and enter drum so that temperature and the soft water flooding quantity of semicoke are chain; The inside, axle center of spiral conveying tube has cooling circulating water, installs in the one end in axle center and revolves change joint, is connected to refrigeration cycle water inlet and refrigeration cycle water out, and other end is closed, and has cooling semicoke effect, can protect again screw shaft.
Handling object in above-mentioned raw gas cleaning apparatus 50 is raw gas, wherein gas content height, meet air or oxygen very easily to blast, for improving the security of operating process further, in a kind of preferred embodiment of the present invention, above-mentioned pyrolysis of coal system also comprises wind stopping device 14, and wind stopping device 14 is arranged on the semicoke powder transfer pipelines between semicoke dust outlet 503 and cooling spiral handling machinery 1313 along the throughput direction of semicoke dust.
The semicoke segmentation temperature got off collected by semicoke dust outlet 503 is higher, wind stopping device 14 is adopted to completely cut off with air, when high-temperature semi-coke segmentation from wind stopping device 14 out after, after entering into cooling spiral handling machinery 13, temperature is reduced to less than 200 DEG C from 550 DEG C-650 DEG C, semicoke fine powder after cooling is directly delivered in the semicoke transport pipe of hotblast stove 40, mixes with the semicoke of below the 2mm of the first of screening plant the screening outlet 302 output, leads to and burn into hotblast stove 40 inside. Wind stopping device 14 essence is a valve, enters in raw gas cleaning apparatus 50 503 passages being connected to prevent there being air to export from cooling spiral handling machinery 13 and semicoke dust.
The above-mentioned pyrolysis of coal system of the present invention also comprises tar coal gas separating unit 60, and tar coal gas separating unit 60 is connected with raw gas cleaning apparatus 50 by purification raw gas outlet 502. Preferably, above-mentioned purge gas entrance 504 is connected with the purified gas storing device (not shown) in tar coal gas separating unit 60 through gas pipeline 53. More preferably, above-mentioned gas pipeline 53 is also provided with well heater (not shown), to be heated by the purge gas entered in raw gas cleaning apparatus 50.
Above-mentioned raw gas cleaning apparatus 50 is preferably above-mentioned high-temperature particle bed fly-ash separator, comprises and the gas pipeline that above-mentioned coal gas blowback entrance is connected. Raw gas from rotatable radiation bed 10 out after, dusty gas enters from the surface of the filtering layer 52 of high-temperature particle bed fly-ash separator, the centrifugation of filtrate in filtering layer 52, the semicoke carried in raw gas segmentation be filtered on the surface of filtering layer 52; Clean raw gas after filtration enters decontamination chamber 51 from the bottom of filtering layer 52, then from purification raw gas outlet 502 discharge being connected with decontamination chamber 51. According to pressure reduction or timing blowback, blowback pipeline utilize 400��550 DEG C of purified gas heated (prevent temperature low, tar precipitates out) as purge gas, lead to bottom the filtrate of high-temperature particle filter bed into, filtrate is floated, collect after the segmentation blowback of the semicoke on filter bed surface is gone out filtering layer, export 503 discharges by semicoke dust. Purification raw gas enters into tar coal gas separating unit 60 and carries out condensation, completes tar collection and cools with coal gas and be separated. This pyrolysis of coal system achieves the multi-joint production realizing coal, oil, gas.
More preferably, above-mentioned high-temperature particle filter bed adopts multilayer filter structure, and filtrate has the arbitrary combination of quartz sand, Wingdale, perlite and semicoke. When above-mentioned high-temperature particle filter bed comprises two layers of filter structure, filter material layer comprises the upper and lower, the density of the filtrate on upper strata is little compared with the density of the filtrate of lower floor, the combination of concrete filter material layer comprise quartz sand and perlite combination, Wingdale and perlite combination, quartz sand and semicoke particle combination, Wingdale and semicoke particle combination or quartz sand and hollow ceramic ball combination.
The above-mentioned pyrolysis of coal system of the present invention, Semi-coke cooling device adopts the cooling apparatus of dry coke quenching to be cooled by semicoke, in order to output speed and the follow-up effective and reasonable screening to cooling semicoke of the semicoke after conservative control cooling, in a kind of preferred embodiment of the present invention, the coolant outlet 202 of above-mentioned Semi-coke cooling device is connected by cooling semicoke transport pipe with screening entrance 301, and cooling semicoke transport pipe is also provided with blow-off valve 15. By arranging blow-off valve 15, conservative control enters the amount of the semicoke in semicoke screening plant 30, thus is more efficiently rationally sieved by the semicoke of different purposes. Specifically, above-mentioned screening plant preferably but is not limited only to the function with screening below 2mm particle, it is also possible to has the screening function of multiple different-grain diameter simultaneously, processes as long as the semicoke of difficult below 2mm can be carried out screening. Namely, when semicoke screening plant also comprises the 2nd screening outlet, the particle diameter of the semicoke of the first screening outlet 302 output is less than the particle diameter of the semicoke that the 2nd screening outlet exports. Preferably the particle diameter of the semicoke of this first screening outlet 302 output is for being less than 2mm.
The above-mentioned pyrolysis of coal system of the present invention also comprises storage bin 16, and storage bin 16 is connected with the coal opening for feed 101 in rotatable radiation bed 10 by feeding screw 17.
During work, grain diameter can be adopted to be the foam coal of below 25mm, it is transported in storage bin 16 by delivery system, by the input speed of the input speed of adjustment coal handling system and feeding screw 17, makes the material position in storage bin 16 remain at certain altitude. after coal falls into feeding screw 17 from storage bin 16 outlet, under the pushing effect of screw-blade, enter in rotatable radiation bed 10, rotatable radiation bed 10 adopts radiator tube rotary kiln, foam coal is in the process rotated, move forward, in moving process, the high-temperature flue gas of 800��1000 DEG C of radiator tube inside transfers heat to coal by radiator tube, coal is after being heated, drying is comprised through series reaction, pre-destructive distillation, destructive distillation and flashing speed oven etc. react, generate the raw gas (tar steam of 450 DEG C��500 DEG C, the mixture of coal gas and semicoke fine powder) and 550 DEG C��650 DEG C high-temperature semi-coke.
Above-mentioned feeding screw 17 preferably adopts varying pitch, under the prerequisite ensureing charging, employing pitch is pre-small post-large, namely little pitch is adopted near charging, adopting coarse pitch near the rear end of discharging position, little pitch can ensure that spiral feed end material is more substantial, isolated rotatable radiation bed 10 and storage bin 16, avoid the gas anti-channeling in rotatable radiation bed 10 to storage bin 16, cause swollen material phenomenon.
In a kind of most preferred embodiment of the present invention, pyrolysis of coal system comprises storage bin 16, and storage bin 16 blanking port is connected with feeding screw 17 entrance, and the outlet of feeding screw 17 is connected with rotatable radiation bed 10 (the rotatable radiation bed of radiator tube), the thermal medium inlet 102 of rotatable radiation bed 10 is connected with the hot blast venting port 402 of hotblast stove 40, the thermal medium outlet of rotatable radiation bed 10 is divided into two-way, one tunnel road processes as flue gas, another road is connected with the first blower fan 11 entrance, and the hot blast conveying pipe road that the first blower fan 11 exports between the hot blast venting port 402 with hotblast stove 40 to the thermal medium inlet 102 of rotatable radiation bed 10 is connected, the kiln head product of rotatable radiation bed 10 is divided into raw gas outlet 104 and semicoke to export 103 two outlets, the raw gas outlet 104 of rotatable radiation bed 10 is connected with raw gas cleaning apparatus 50 (i.e. high-temperature particle filter bed) entrance, the entrance of tar coal gas separating unit 60 is connected with the outlet of high-temperature particle filter bed, the semicoke outlet 103 of rotatable radiation bed 10 is connected with Semi-coke cooling device 20 entrance, the coolant outlet 202 of dry coke quenching equipment is connected with blow-off valve 15 entrance, the outlet of blow-off valve 15 is connected with the entrance of semicoke screening plant 30, semicoke screening plant 30 outlet is divided into 2 tunnels, semicoke storage area directly delivered to by semicoke screening plant 30 coarse fodder (more than 2mm), fines outlet (below 2mm) is connected with the air supply duct of the 2nd blower fan 12 (roots blower), the semicoke dust outlet 503 of high-temperature particle filter bed is connected with wind stopping device 14 entrance, and the outlet of wind stopping device 14 is connected with cooling spiral handling machinery 13 entrance, and the outlet of cooling spiral handling machinery 13 is connected with the air supply duct of roots blower, the combustion-supporting wind inlet 413 of hotblast stove 40 is connected with the outlet of burner blower, and the semicoke import 401 of hotblast stove 40 is connected with the air supply duct outlet of roots blower.
In above preferred embodiment, by adopting hotblast stove half coke gasification and heating unit to be substituted, simplified system; Reflux from the partial fume after rotatable radiation bed 10 out heat exchange, mix with hotblast stove 40 high-temperature flue gas out, reduce high-temperature flue gas oxygen level, namely reduce risk, it is to increase heat utilization rate; Not only can realize coal and semicoke close-coupled processing, and the low-rank coal such as foam coal can be utilized as fuel, it is achieved that the clean and effective of foam coal utilizes, and system operation is simple, stable, has outstanding economic benefit. In addition, this pyrolysis of coal system adopts high-temperature particle bed as raw gas cleaning apparatus 50, solve the problem that ceramic element is difficult for regeneration, raw gas cleaning apparatus 50 separates semicoke dust after cooling indirectly, it is delivered to hotblast stove 40 to use as burning, after this part fines collection more difficult, avoid secondary processing expense.
From above description, it can be seen that with the contrast of existing pyrolytic process system technology, the above embodiments of the present invention achieve following technique effect:
1) be applicable to large industrialized produce, unit year processing power reach as high as 1,500,000 tons, be suitable for carrying out the pyrolysis of industrialization, and do not limit by coal, the pyrolysis processing of multiple coal can be carried out.
2) this pyrolysis of coal system is become by the hotblast stove of the semicoke that burns and rotatable radiation bed series combination, and system is simple, and process structure is reasonable. Method for pyrolysis adopts indirect heating mode, and many group radiator tubes ensure the abundant pyrolysis of material, caloric power of gas height, semicoke steady quality, and tar taste is higher.
3) utilize below 2mm semicoke to use as fuel, solve the problem that the process of semicoke foam is difficult, simultaneously, it is possible to collecting GOOD TASTE coal gas and tar collection, economic performance is good.
4) hot precipitator adopts bed filtration bed, the low (30mg/Nm of dust content in raw gas3), tar quality is higher; Equipment energy consumption is low, and regeneration easily, solves the regeneration difficulty problem of current vitrified pipe and metal sintering pipe.
5) novel process system be realize coal, oil, gas multi-production process create condition.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. Within the spirit and principles in the present invention all, any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. a pyrolysis of coal system, it is characterised in that, described pyrolysis of coal system comprises:
Rotatable radiation bed (10), described rotatable radiation bed (10) is provided with coal opening for feed (101), thermal medium inlet (102), semicoke outlet (103) and raw gas outlet (104);
Semi-coke cooling device (20), described Semi-coke cooling device (20) comprises cooling entrance (201) and coolant outlet (202), and described semicoke outlet (103) is connected with described cooling entrance (201);
Semicoke screening plant (30), described semicoke screening plant (30) comprises screening entrance (301) and the first screening outlet (302), and described screening entrance (301) is connected with described coolant outlet (202); And
Hotblast stove (40), described hotblast stove (40) is provided with semicoke import (401) and hot blast venting port (402), described semicoke import (401) is connected with described first screening outlet (302), and described hot blast venting port (402) is connected with the described thermal medium inlet (102) on described rotatable radiation bed (10).
2. pyrolysis of coal system according to claim 1, it is characterized in that, also being provided with thermal medium outlet (105) on described rotatable radiation bed (10), described thermal medium outlet (105) is connected with described thermal medium inlet (102) by the first blower fan (11).
3. pyrolysis of coal system according to claim 2, it is characterized in that, described hot blast venting port (402) on described hotblast stove (40) is connected with the described thermal medium inlet (102) on described rotatable radiation bed (10) by hot blast input channel, and described first blower fan (11) is connected with described hot blast input channel.
4. pyrolysis of coal system according to claim 1, it is characterized in that, described pyrolysis of coal system also comprises raw gas cleaning apparatus (50), described raw gas cleaning apparatus (50) comprises raw gas entrance (501), purification raw gas outlet (502) and semicoke dust outlet (503), described raw gas entrance (501) is connected with described raw gas outlet (104) on described rotatable radiation bed (10), described semicoke dust outlet (503) is connected with the described semicoke import (401) on described hotblast stove (40).
5. pyrolysis of coal system according to claim 4, it is characterized in that, described pyrolysis of coal system also comprises the 2nd blower fan (12), and described 2nd blower fan (12) is connected with the semicoke transport pipe being arranged between described first screening outlet (302) and described semicoke import (401).
6. pyrolysis of coal system according to claim 5, it is characterised in that, described semicoke dust outlet (503) is connected with described semicoke transport pipe.
7. pyrolysis of coal system according to any one of claim 1 to 6, it is characterised in that, described hotblast stove (40) comprising:
Combustion chamber (41), described combustion chamber (41) are provided with burner (411), combustion-supporting wind inlet (413) and described semicoke import (401); And
Settling pocket (42), described settling pocket (42) is connected with described combustion chamber (41), and described settling pocket (42) is provided with flue-dust retainer (421) and described hot blast venting port (402).
8. pyrolysis of coal system according to claim 7, it is characterised in that,
Described combustion chamber (41) is connected with the bottom of described settling pocket (42), and described hot blast venting port (402) is positioned at the top of described settling pocket (42), described flue-dust retainer (421) is positioned at the bottom of described settling pocket (42).
9. pyrolysis of coal system according to claim 7, it is characterised in that,
Described combustion chamber (41) is connected with the top of described settling pocket (42), described settling pocket (42) is provided with one or more windsheild (422), the air-guiding aisle of bending is formed, and described hot blast venting port (402) is positioned at the side away from described combustion chamber (41) of described settling pocket (42) between the inwall of described windsheild (422) and described settling pocket (42).
10. pyrolysis of coal system according to claim 7, it is characterized in that, in described hotblast stove (40), the path between described combustion chamber (41) and described settling pocket (42) is also provided with mixing section, described mixing section is provided with and regulates wind inlet mouth.
11. pyrolysis of coal systems according to claim 6, it is characterized in that, described pyrolysis of coal system also comprises cooling spiral handling machinery (13), and described semicoke dust outlet (503) is connected with described semicoke transport pipe by described cooling spiral handling machinery (13).
12. pyrolysis of coal systems according to claim 11, it is characterized in that, described pyrolysis of coal system also comprises wind stopping device (14), and described wind stopping device (14) is arranged on the semicoke powder transfer pipelines between described semicoke dust outlet (503) and described cooling spiral handling machinery (13) along the throughput direction of semicoke dust.
The 13. pyrolysis of coal systems according to any one of claim 4 to 6,11 and 12, it is characterized in that, described pyrolysis of coal system also comprises tar coal gas separating unit (60), and described tar coal gas separating unit (60) exports (502) by described purification raw gas and be connected with described raw gas cleaning apparatus (50).
14. pyrolysis of coal systems according to claim 1, it is characterized in that, described coolant outlet (202) is connected by cooling semicoke transport pipe with described screening entrance (301), and described cooling semicoke transport pipe is also provided with blow-off valve (15).
15. pyrolysis of coal systems according to claim 1, it is characterized in that, described pyrolysis of coal system also comprises storage bin (16), and described storage bin (16) is connected with the described coal opening for feed (101) on described rotatable radiation bed (10) by feeding screw (17).
16. pyrolysis of coal systems according to claim 1, it is characterized in that, described semicoke screening plant also comprises the 2nd screening outlet, and the particle diameter of the semicoke that described first screening outlet (302) exports is less than the particle diameter of the semicoke that described 2nd screening outlet exports.
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