CN104178193A - Coal-gas-circulation coal whole-size-grading pyrolytic coupling hot-pressing formed coke preparation technique and system - Google Patents
Coal-gas-circulation coal whole-size-grading pyrolytic coupling hot-pressing formed coke preparation technique and system Download PDFInfo
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- CN104178193A CN104178193A CN201410408287.1A CN201410408287A CN104178193A CN 104178193 A CN104178193 A CN 104178193A CN 201410408287 A CN201410408287 A CN 201410408287A CN 104178193 A CN104178193 A CN 104178193A
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Abstract
The invention provides a coal-gas-circulation coal whole-size-grading pyrolytic coupling hot-pressing formed coke preparation technique and system. Raw coal is divided into slack coal and pea coal by a raw coal preheating grading system; the coal gas generated by the method is used as a heat source for slack coal pyrolysis in a slack coal pyrolyzing furnace, and pyrolytic coal gas generated by slack coal pyrolysis is used as a heat source for pea coal pyrolysis; hot semicoke obtained after the slack coal and pea coal pyrolysis is used as a raw material for preparing the hot-pressing formed coke; and tar slag collected at the coal pyrolysis section is used instead of part of the adhesive for preparing the hot-pressing formed coke. The coal pyrolysis technique and hot-pressing formed coke preparation technique are coupled to produce the formed coke, thereby implementing graded utilization of coal and coke making of mill coal, saving the rare coke resources for the nation, and implementing high added value utilization of the product semicoke. The tar slag generated at the coal pyrolysis section is used as part of the adhesive instead of part of high-price coal pitch, thereby achieving the goal of waste reutilization. By using the hot semicoke as the raw material, the formed coke is formed under hot conditions, so that the heat utilization efficiency is high.
Description
Technical field
The present invention relates to technical field of coal chemical industry, be specifically related to a kind of coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology and system.
Background technology
Chinese coal reserves account for 12% of global coal resources, China's low-rank coal standing stock account for 50% left and right of coal reserves, output accounts for 30% of current total amount, as the raw material of production metallurgy coke---and coking coal resource is very rare, and reserves are not as good as 10% of coal total reserves.
Low-rank coal is due to high-moisture, high-volatile, and low heat value, and the feature of spontaneous combustion very easily, thus be unsuitable for standing storage and long-distance transportation, be considered for a long time a kind of low-grade coal resource.But by pyrolysis, this low-grade coal can produce pyrolysis coal gas, tar and the high fixed carbon of high added value, the solid semicoke product of high heating value.Pyrolysis coal gas can be used as town gas, the synthetic raw material of chemical industry; Tar can make China's petrol and diesel oil in short supply by deep processing; Semicoke can be used as steam coal, also can substitute metallurgical coke by moulding, thereby eliminates the rare impact that metallurgy industry is caused of China's coking coal resource.
The technology of utilizing at present pyrolysis of coal semicoke to prepare formed coke has coldmoulding and hot-forming according to mold temperature condition, wherein simple, the save energy of hot-briquetting modeling process.Therefore utilizing pyrolysis of coal coupling formcoke from hot briquetting technology is the more satisfactory scheme of manufacture formed coke.
Having publication number about the invention of pyrolysis of coal coupling formcoke from hot briquetting is at present CN103361093A " system and method for a kind of pyrolysis coke powder comprehensive high-efficiency production of shaped coal and formed coke ", the scheme that this invention provides is for to make semi-coke powder and coal tar by pulverized coal pyrolysis, then utilize semi-coke powder for raw material, coal tar, as binding agent, makes industrial shaped coke by hot-forming, charing.
The shortcoming that this patent exists is:
1, the pyrolysis coal gas dedusting technology efficiency of dust collection of this technology is not high, and in the tar of recovery, dust content is high;
2, this technology utilizes the high added value tar of technique self production as the binding agent of producing formed coke, and production cost is high.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology, adopt the hot semicoke of pyrolysis of coal generation as formed coke principle, the coke tar refuse that pyrolysis of coal produces substitutes a part and produces the binding agent that formed coke is used, reduce binding agent and be used for, cost-saving.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology, is characterized in that, comprises the steps:
A, raw coal is divided into smalls and beans through raw coal preheating hierarchy system;
B, smalls is sent into the pyrolysis of smalls pyrolysis oven, beans is sent into the pyrolysis of beans pyrolysis oven;
The smalls pyrolysis coal gas that c, smalls pyrolysis produce is sent in beans pyrolysis oven as the thermal source of beans pyrolysis, and the high temperature semicoke grain that the high-temperature semi-coke powder that smalls pyrolysis produces and beans pyrolysis produce is sent in formcoke from hot briquetting preparation system as formed coke raw material;
The filter material layer that d, beans form in beans pyrolysis oven filters smalls pyrolysis coal gas, the pyrolysis coal gas after filtering carried out obtaining clean gas after meticulous dedusting and cooling recovery tar,
E, to reclaim tar filter, the liquid oils obtaining is exported as tar products, the coke tar refuse obtaining is sent in formcoke from hot briquetting preparation system as binding agent;
F, clean gas are divided into four parts, a part is sent in formcoke from hot briquetting preparation system as charing carrier gas, a part is sent in formcoke from hot briquetting preparation system as fuel, and a part is sent in pyrolysis gas-fired furnace as pyrolysis carrier gas, and another part is sent in gas-fired furnace as fuel;
G, pyrolysis carrier gas become coal gas of high temperature after by indirect heating, and send in smalls pyrolysis oven as the thermal source of smalls pyrolysis, and the high-temperature flue gas that pyrolysis gas-fired furnace produces is sent in raw coal preheating hierarchy system as the thermal source of raw coal preheating;
The pyrolysis coal gas producing in h, formcoke from hot briquetting preparation system is sent in beans pyrolysis oven as the thermal source of beans pyrolysis, and the flue gas producing in formcoke from hot briquetting preparation system is directly emptying.
The present invention adopts pyrolysis of coal section coupling formcoke from hot briquetting preparation section, and the tar that pyrolysis of coal section is collected obtains coke tar refuse through filtering, and utilizes this coke tar refuse to substitute a part of formcoke from hot briquetting binding agent, realizes the object of refuse reclamation, has reduced production cost; The hot semicoke that utilizes pyrolysis of coal to produce is raw material, and at hot condition compacted under, heating efficiency is high.
The present invention adopts raw coal preheating hierarchy system that raw coal is divided into smalls and the beans that particle size range is different, the coal gas that utilizes self method to produce becomes coal gas of high temperature after gas-fired furnace indirect heating, as the thermal source of smalls pyrolysis, and the high temperature smalls pyrolysis coal gas producing after smalls pyrolysis is as the thermal source of beans pyrolysis, take full advantage of the waste heat of material and gas, reach the even pyrolysis of coal classification, improve the object of pyrolysis gas yield and the tar rate of recovery, and saved mass energy, production cost reduces.
The present invention utilizes the filter material layer that beans forms in beans pyrolysis oven to carry out dedusting, tentatively cooling to sending into the high temperature pyrolysis coal gas of beans pyrolysis oven, for follow-up pyrolysis coal gas essence dedusting and eventually cold reduction burden, reach the dustiness of the tar that reduces system recoveries, improve the object of tar quality and gas purification effect, utilize low temperature beans to reclaim the heat of high temperature smalls pyrolysis coal gas simultaneously, reach the recycling of heat.
Further, described formcoke from hot briquetting preparation technology comprises the steps:
1) the formed coke raw material from pyrolysis of coal section is sent in stirred pot, the coke tar refuse of simultaneously allocating coal-tar pitch into and reclaim from pyrolysis of coal section is as binding agent, in stirred pot, be fully uniformly mixed, the pyrolysis coal gas that whipping process is produced carries out meticulous dedusting and cooling recovery tar;
2) batch mixing after mixing utilizes to send into after forming machine extrusion molding and in charring furnace, carries out charing processing;
3) charing gas-fired furnace is sent in charring furnace heat the carrier gas as charing thermal source from a part of clean gas of pyrolysis of coal section, and adopts from a part of clean gas of pyrolysis of coal section as fuel;
4) high-temperature flue gas that the burning of charing gas-fired furnace produces is divided into two portions, a part is carried out heat fused as thermal source to the coal-tar pitch of allocating into, after the high-temperature flue gas that another part produces with pyrolysis gas-fired furnace mixes, sends in raw coal preheating hierarchy system as the thermal source of raw coal preheating;
5) charing produce high temperature pyrolysis coal gas send in beans pyrolysis oven as thermal source, charing produce high temperature formed coke after cooling directly as formed coke output of products.
In formcoke from hot briquetting preparation section, utilize a part of clean gas of pyrolysis of coal generation as the thermal source carrier gas of charring furnace, part clean gas is as the fuel of charing gas-fired furnace, and the high temperature pyrolysis coal gas that charing is produced is as the thermal source of beans pyrolysis oven, the high-temperature flue gas that charing gas-fired furnace produces is used separately as the thermal source of coal-tar pitch heating and raw coal preheating, take full advantage of waste heat, reduced production cost.
Further, in described step 1) into, bottle coal can also be allocated or rich coal is sent in stirred pot as binder mixture.Can utilize the plastic mass that the relatively low gas-fat coal of price mixing is separated out in thermal state forming process to carry out bonding raw material semicoke, substitute part of coal pitch, further reduce the consumption of coal-tar pitch.
Preferably, the quality proportioning of described binder mixture is bottle coal or rich coal 60%, coal-tar pitch 30% and coke tar refuse 10%.
Further, the coal-tar pitch of allocating in described step 1) and coke tar refuse are first sent in coal-tar pitch melting pot after heat fused, send in stirred pot as binding agent.
Further, the high temperature formed coke that in described step 5), charing produces is sent in water cooler Yu from the low-temperature carbonization carrier gas of pyrolysis of coal section and is carried out heat exchange, cooled formed coke is directly exported as product, and further heating in charing gas-fired furnace is sent in charing carrier gas after preheating.Enter charing gas-fired furnace clean gas before and carry out heat exchange as charing carrier gas and the high temperature formed coke of cooling use, play this clean gas of preheating and reduce the effect of high temperature formed coke temperature, take full advantage of waste heat, reduced the firing rate of follow-up charing gas-fired furnace.
Preferably, the coal gas of high temperature temperature producing in described step g is 650～750 DEG C, can, to the heating of smalls fast fluidization, complete flash pyrolysis.Utilize coal gas of high temperature to carry out the pyrolysis of fluidisation flash to smalls, pyrolysis reactions steps in the middle of reducing, reduces pyrolysis precipitate in the residence time of high-temperature zone, avoids the secondary pyrolysis of precipitate, improves the productive rate of pyrolysis coal gas and tar.
The present invention also provides a kind of coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation system for technique described in the claims, comprising:
Raw coal preheating hierarchy system, beans pyrolysis oven, smalls pyrolysis oven, pyrolysis gas treatment system, formcoke from hot briquetting preparation system, pyrolysis gas-fired furnace; The discharge port of described raw coal preheating hierarchy system is connected with the feeding mouth of smalls pyrolysis oven with beans pyrolysis oven respectively; The pyrolysis gas exit of described beans pyrolysis oven is connected with the import of pyrolysis gas treatment system, and the material outlet of beans pyrolysis oven is connected with the feed(raw material)inlet of formcoke from hot briquetting preparation system; The pyrolysis gas exit of described smalls pyrolysis oven is connected with the thermal source entrance of beans pyrolysis oven, and the material outlet of smalls pyrolysis oven is connected with the feed(raw material)inlet of formcoke from hot briquetting preparation system; Described pyrolysis gas treatment system comprises meticulous fly-ash separator and coal gas cooling device and tar groove and the tar filter vat that pipeline is connected, the pyrolysis gas exit of described beans pyrolysis oven is connected with the import of this meticulous fly-ash separator, the material outlet of described coal gas cooling device is connected with the entrance of tar groove, the liquid exit of tar filter is directly exported tar products, and the solid outlet of tar filter is connected with formcoke from hot briquetting preparation system; The gas exit of described coal gas cooling device is divided into four tunnels, one tunnel is connected with the charing carrier gas inlet of formcoke from hot briquetting preparation system, one tunnel is connected with the fuel inlet of formcoke from hot briquetting preparation system, one tunnel is connected with the gas entry of pyrolysis gas-fired furnace, and another road is connected with the fuel inlet of pyrolysis gas-fired furnace; The pyrolysis gas exit of described formcoke from hot briquetting preparation system is connected with the thermal source entrance of beans pyrolysis oven, and the exhanst gas outlet of half formcoke from hot briquetting preparation system is directly communicated with atmosphere; The coal gas of high temperature outlet of described gas-fired furnace is connected with the thermal source entrance of smalls pyrolysis oven, and the exhanst gas outlet of gas-fired furnace is connected with the thermal source entrance of raw coal preheating hierarchy system.
Further, described formcoke from hot briquetting preparation system comprises:
Coal-tar pitch melting pot, stirred pot, forming machine, charring furnace, water cooler and charing gas-fired furnace; Feeding is connected the feeding mouth of described coal-tar pitch melting pot with coal-tar pitch with the solid outlet of tar filter respectively, and the discharge port of coal-tar pitch melting pot is connected with the binding agent entrance of stirred pot, and the exhanst gas outlet of coal-tar pitch melting pot is directly communicated with atmosphere; The feed(raw material)inlet of described stirred pot is connected with beans pyrolysis oven with smalls pyrolysis oven respectively, and the pyrolysis gas exit of stirred pot is connected with the import of meticulous fly-ash separator, and the discharge port of stirred pot is connected with the feeding mouth of forming machine; The discharge port of described forming machine is connected with the feeding mouth of charring furnace; The pyrolysis gas exit of described charring furnace is connected with the thermal source entrance of beans pyrolysis oven, and the discharge port of charring furnace is connected with the feeding mouth of water cooler; The gas entry of described water cooler is connected with the gas exit of described coal gas cooling device, and the discharge port of water cooler is directly exported formed coke product, and the gas exit of water cooler is connected with the gas entry of charing gas-fired furnace; The fuel inlet of described charing gas-fired furnace is connected with the gas exit of described coal gas cooling device, the outlet of charing gas-fired furnace coal gas of high temperature is connected with the gas entry of charring furnace, the exhanst gas outlet of charing gas-fired furnace is divided into two-way, one tunnel is connected with the smoke inlet of coal-tar pitch melting pot, and another road is connected with the thermal source entrance of raw coal preheating hierarchy system.
Further, directly output coal dust product of the dust-removing powder of described meticulous fly-ash separator outlet.
From above technical scheme, the present invention utilizes coal pyrolysis technique and the formcoke from hot briquetting preparation technology production formed coke that is coupled, realize the classification utilization of coal, realize mill coal coking, for country saves rare coking coal resource, and the high value added utilization of product semicoke, adopt the coke tar refuse of pyrolysis of coal section generation as part binding agent, the consumption of the coal-tar pitch that Substitute For Partial price is higher, realize the object of refuse reclamation simultaneously, utilize hot semicoke for raw material, hot condition compacted under, heating efficiency is high.
Brief description of the drawings
Fig. 1 is coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology's of the present invention schematic flow sheet;
The schematic diagram of Fig. 2 coal gas circulation of the present invention coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation system.
In figure: 100, raw coal preheating hierarchy system, 110, fly-ash separator, 120, desulfurizer, 101, raw coal, 102, cryodrying gas, 103, beans, 104, smalls, 111, dried tail gas, 112, dirt powder, 121, tail gas;
200, beans pyrolysis oven, 201, pyrolysis coal gas, 202, high temperature semicoke grain;
300, smalls pyrolysis oven, 301, smalls pyrolysis coal gas, 302, high-temperature semi-coke powder;
400, pyrolysis gas treatment system, 410, meticulous fly-ash separator, 420, coal gas cooling device, 430, tar groove, 440, tar filter, 411, coal dust, 412, smart dedusting pyrolysis gas, 421, reclaim tar, 422, clean gas, 423, charing carrier gas, 424, fuel one, 425, pyrolysis carrier gas, 426, fuel two, 441, tar products, 442, coke tar refuse;
500, formcoke from hot briquetting preparation system, 510, coal-tar pitch melting pot, 520, stirred pot, 530, forming machine, 540, charring furnace, 550, water cooler, 560, charing gas-fired furnace, 501, coal-tar pitch, 502, bottle coal or rich coal, 511, binding agent, 512, flue gas, 521, stirred pot pyrolysis coal gas, 522, batch mixing, 531, low temperature formed coke, 541, charring furnace pyrolysis gas, 542, high temperature formed coke, 551, formed coke product, 552, preheating charing carrier gas, 561, charing coal gas of high temperature, 562, high-temperature flue gas one, 563, melting pot carrier gas, 564, raw coal preheating carrier gas,
600, pyrolysis gas-fired furnace, 601, pyrolysis coal gas of high temperature, 602, high-temperature flue gas two, 603, mixed flue gas.
Embodiment
Below in conjunction with accompanying drawing, a kind of preferred implementation of the present invention is described in detail.
As shown in Figure 2, coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation system of the present invention comprises: raw coal preheating hierarchy system 100, beans pyrolysis oven 200, smalls pyrolysis oven 300, pyrolysis gas treatment system 400, formcoke from hot briquetting preparation system 500, pyrolysis gas-fired furnace 600.Described raw coal preheating hierarchy system also comprises fly-ash separator 110 and desulfurizer 120; Described pyrolysis gas treatment system comprises meticulous fly-ash separator 410, coal gas cooling device 420, tar groove 430 and tar filter 440; Described formcoke from hot briquetting preparation system comprises coal-tar pitch melting pot 510, stirred pot 520, forming machine 530, charring furnace 540, water cooler 550 and charing gas-fired furnace 560.
Described raw coal preheating hierarchy system 100 is taking raw coal as raw material, the high-temperature flue gas that its thermal source is discharged by pyrolysis gas-fired furnace and charing gas-fired furnace provides, it is provided with smalls, three outlets of beans and cryodrying gas, wherein the outlet of smalls is connected with smalls pyrolysis oven feeding mouth, the outlet of beans is connected with beans pyrolysis oven feeding mouth, the outlet of cryodrying gas is connected with the entrance of fly-ash separator, the outlet of described fly-ash separator is connected with the entrance of desulfurizer, the dirt powder outlet of fly-ash separator is connected with the material inlet of smalls pyrolysis oven, the outlet of described desulfurizer is communicated with atmosphere.
The coal gas of high temperature that the thermal source of described smalls pyrolysis oven 300 is carried by pyrolysis gas-fired furnace provides, smalls pyrolysis oven is provided with smalls pyrolysis gas exit and high-temperature semi-coke powder outlet, smalls pyrolysis gas exit is connected with the thermal source entrance of beans pyrolysis oven, and high-temperature semi-coke powder outlet is connected with the feed(raw material)inlet of stirred pot.
The thermal source of described beans pyrolysis oven 200 is stirred the high temperature pyrolysis coal gas that in generation and charring furnace, charing produces and is provided by smalls pyrolysis generation, stirred pot Raw, beans pyrolysis oven is provided with pyrolysis gas exit and the outlet of high temperature semicoke grain, wherein pyrolysis gas exit is connected with the pyrolysis gas entrance of meticulous fly-ash separator, and the outlet of high temperature semicoke grain is connected with the feed(raw material)inlet of stirred pot.
The dust-removing powder of described meticulous fly-ash separator 410 exports directly as coal dust output of products, the pyrolysis gas outlet of meticulous fly-ash separator is connected with the entrance of coal gas cooling device, the material outlet of coal gas cooling device 420 is connected with the entrance of tar groove, the outlet of tar groove is connected with the entrance of tar filter, the liquid exit of tar filter is directly as tar products output, and the solid outlet of tar filter is connected with described coal-tar pitch melting pot entrance.The gas exit of coal gas cooling device is divided into four tunnels, one tunnel is connected with the gas entry of water cooler, one tunnel is connected with the fuel inlet of charing gas-fired furnace, and a road is connected with the gas entry of pyrolysis gas-fired furnace, and another road is connected with the fuel inlet of pyrolysis gas-fired furnace.
The part high-temperature flue gas that the thermal source of described coal-tar pitch melting pot 510 is carried by charing gas-fired furnace provides, coal-tar pitch melting pot is provided with the entrance for adding asphalt stock, the exhanst gas outlet of coal-tar pitch melting pot is communicated with atmosphere, and the feeding mouth of coal-tar pitch melting pot is connected with the entrance of stirred pot.
Described stirred pot 520 pyrolysis gas outlets are connected with the import of meticulous fly-ash separator, and the discharge port of stirred pot is connected with forming machine entrance.In order further to reduce the coal-tar pitch consumption of allocating into, can on stirred pot, be provided for adding the feed(raw material)inlet of gas-fat coal.
The discharge port of described forming machine 530 is connected with the feeding mouth of charring furnace, and forming machine adopts a kind of roller briquetting machine, and forming pressure is about 50MPa.
The coal gas of high temperature that the thermal source of described charring furnace 540 is carried by charing gas-fired furnace provides, and the pyrolysis gas outlet of charring furnace is connected with the thermal source entrance of beans pyrolysis oven, and the discharge port of charring furnace is connected with the feeding mouth of water cooler.
The discharge port of described water cooler 550 is directly as formed coke output of products, and the gas exit of water cooler is connected with the gas entry of charing gas-fired furnace.
The coal gas of high temperature outlet of described charing gas-fired furnace 560 is connected with the gas entry of charring furnace, the exhanst gas outlet of charing gas-fired furnace is divided into two-way, one tunnel is connected with the smoke inlet of coal-tar pitch melting pot, and another road is connected with the thermal source entrance of raw coal preheating hierarchy system.
Described pyrolysis gas-fired furnace 600 is provided with coal gas of high temperature outlet and high-temperature flue gas outlet, and wherein coal gas of high temperature outlet is connected with the thermal source entrance of smalls pyrolysis oven, and high-temperature flue gas outlet is connected with the thermal source entrance of raw coal preheating hierarchy system.
With reference to Fig. 1, coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology's of the present invention flow process is described below:
Utilize preheating hierarchy system 100 that raw coal 101 is divided into and is less than or equal to the smalls 104 of 5mm and the beans 103 of 5～50mm, utilize mixed flue gas 603 to carry out preheating and drying to raw coal, this mixed flue gas is from the raw coal preheating carrier gas 564 of 300 DEG C of high-temperature flue gas 602 and the charing gas-fired furnace of pyrolysis gas-fired furnace simultaneously.The dried tail gas 111 of the cryodrying gas 102 that preheating hierarchy system produces after fly-ash separator 110 dedustings delivered in desulfurizer 120, it is emptying that desulfurization forms tail gas 121 after processing, the dirt powder 112 of this fly-ash separator enters smalls pyrolysis oven 300 after mixing with smalls 104, and described beans 103 enters pyrolysis in beans pyrolysis oven 200.
Wherein smalls pyrolysis oven 300 utilizes from the coal gas of high temperature 601 of 650～750 DEG C of pyrolysis gas-fired furnace smalls fast fluidization is heated, flash pyrolysis, the smalls pyrolysis coal gas 301 of 600～650 DEG C that pyrolysis forms enters beans pyrolysis oven 200, for beans pyrolysis provides thermal source, the filter material layer that beans forms in pyrolysis oven simultaneously filters smalls pyrolysis coal gas, by in pyrolysis gas >=trapping dust of 20 μ m, after beans filter material layer dust removal by filtration, the pyrolysis coal gas 201 of approximately 200 DEG C is sent into pyrolysis gas treatment system 400 and is carried out meticulous dedusting and cooling recovery tar.The high-temperature semi-coke powder 302 of 550～600 DEG C producing in smalls pyrolysis oven enters the raw material as formcoke from hot briquetting in the stirred pot in formcoke from hot briquetting preparation system 500 together with the high temperature semicoke grain 202 of 500～550 DEG C that produce in beans pyrolysis oven.
The pyrolysis coal gas 201 that beans pyrolysis oven is carried first carries out meticulous dedusting, dust-removing powder after meticulous dedusting is directly exported as coal dust product 411, smart dedusting pyrolysis gas 412 after meticulous dedusting is sent in coal gas cooling device 420, recovery eliminates after tar, output low temperature clean gas 422, reclaiming tar 421 enters in tar groove 430, then send in tar filter 440 and filter, the liquid oils obtaining is exported as final tar products 441, and tar filter is tackled the coke tar refuse 442 of the getting off binding agent as formcoke from hot briquetting.
Coal-tar pitch 501 heat fused in coal-tar pitch melting pot by the coke tar refuse 442 of collecting with outsourcing, and adopt from the high-temperature flue gas of charing gas-fired furnace and provide thermal source as melting pot carrier gas 563 for coal-tar pitch melting pot, the flue gas 512 of generation is directly emptying.Coal-tar pitch hydrothermal solution after fusing is delivered in stirred pot 520 as the binding agent 511 of producing formed coke, the high temperature semicoke grain 202 producing with the high-temperature semi-coke powder 302 producing from smalls pyrolysis and beans pyrolysis is fully uniformly mixed in stirred pot, and the bottle coal that can simultaneously allocate into or rich coal 502 carry out Substitute For Partial coal-tar pitch.The stirred pot pyrolysis coal gas 521 producing in process is sent into dedusting in meticulous fly-ash separator, the batch mixing 522 that mixes output in stirred pot utilizes forming machine 530 extruding to form low temperature formed coke 531, low temperature formed coke is sent into charring furnace charing, 1000 DEG C of left and right charing coal gas of high temperature 561 that the thermal source of charring furnace is carried from charing gas-fired furnace, charring furnace pyrolysis gas 541 after charing enters in beans pyrolysis oven as thermal source, and the high temperature formed coke 542 after charing is sent into cooling output formed coke product 551 in water cooler 550.
Described clean gas 422 outputs are divided into four parts, a part is sent in water cooler 550 and is carried out heat exchange with high temperature formed coke 542 with charing carrier gas 423 as cooling, after heat exchange, charing carrier gas temperature raises and forms preheating charing carrier gas 552, enter in charing gas-fired furnace, deliver in charring furnace after being further heated to 1000 DEG C; A clean gas part is sent in charing gas-fired furnace 560 as fuel 1, and the high-temperature flue gas 1 of generation is divided into two-way, and a road is sent in coal-tar pitch melting pot as thermal source, and raw coal preheating hierarchy system is sent into as thermal source in another road; A clean gas part is further warming up to 650～750 DEG C as pyrolysis carrier gas 425 by pyrolysis gas-fired furnace 600, forms pyrolysis coal gas of high temperature 601, sends into the thermal source of smalls pyrolysis oven 300 as smalls pyrolysis; A clean gas in addition part is sent in pyrolysis gas-fired furnace as fuel 2 426, the high-temperature flue gas of approximately 300 DEG C 2 602 producing after the burning of this pyrolysis gas-fired furnace be mixed to form mixed flue gas 603 from a part of high-temperature flue gas of charing gas-fired furnace, send in raw coal preheating hierarchy system 100 as the thermal source of raw coal preheating.
The above embodiment is only that the preferred embodiment of the present invention is described; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that those of ordinary skill in the art make technical scheme of the present invention, all should fall in the definite protection domain of claims of the present invention.
Claims (10)
1. a coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology, is characterized in that, comprises the steps:
A, raw coal is divided into smalls and beans through raw coal preheating hierarchy system;
B, smalls is sent into the pyrolysis of smalls pyrolysis oven, beans is sent into the pyrolysis of beans pyrolysis oven;
The smalls pyrolysis coal gas that c, smalls pyrolysis produce is sent in beans pyrolysis oven as the thermal source of beans pyrolysis, and the high temperature semicoke grain that the high-temperature semi-coke powder that smalls pyrolysis produces and beans pyrolysis produce is sent in formcoke from hot briquetting preparation system as formed coke raw material;
The filter material layer that d, beans form in beans pyrolysis oven filters smalls pyrolysis coal gas, and the pyrolysis coal gas after filtering is carried out obtaining clean gas after meticulous dedusting and cooling recovery tar;
E, to reclaim tar filter, the liquid oils obtaining is exported as tar products, the coke tar refuse obtaining is sent in formcoke from hot briquetting preparation system as binding agent;
F, clean gas are divided into four parts, a part is sent in formcoke from hot briquetting preparation system as charing carrier gas, a part is sent in formcoke from hot briquetting preparation system as fuel, and a part is sent in pyrolysis gas-fired furnace as pyrolysis carrier gas, and another part is sent in gas-fired furnace as fuel;
G, pyrolysis carrier gas become coal gas of high temperature after by indirect heating, and send in smalls pyrolysis oven as the thermal source of smalls pyrolysis, and the high-temperature flue gas that pyrolysis gas-fired furnace produces is sent in raw coal preheating hierarchy system as the thermal source of raw coal preheating;
The pyrolysis coal gas producing in h, formcoke from hot briquetting preparation system is sent in beans pyrolysis oven as the thermal source of beans pyrolysis, and the flue gas producing in formcoke from hot briquetting preparation system is directly emptying.
2. coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology according to claim 1, is characterized in that, described formcoke from hot briquetting preparation technology comprises the steps:
1) the formed coke raw material from pyrolysis of coal section is sent in stirred pot, the coke tar refuse of simultaneously allocating coal-tar pitch into and reclaim from pyrolysis of coal section is as binding agent, in stirred pot, be fully uniformly mixed, the pyrolysis coal gas that whipping process is produced carries out meticulous dedusting and cooling recovery tar;
2) batch mixing after mixing utilizes to send into after forming machine extrusion molding and in charring furnace, carries out charing processing;
3) charing gas-fired furnace is sent in charring furnace heat the carrier gas as charing thermal source from a part of clean gas of pyrolysis of coal section, and adopts from a part of clean gas of pyrolysis of coal section as fuel;
4) high-temperature flue gas that the burning of charing gas-fired furnace produces is divided into two portions, a part is carried out heat fused as thermal source to the coal-tar pitch of allocating into, after the high-temperature flue gas that another part produces with pyrolysis gas-fired furnace mixes, sends in raw coal preheating hierarchy system as the thermal source of raw coal preheating;
5) charing produce high temperature pyrolysis coal gas send in beans pyrolysis oven as thermal source, charing produce high temperature formed coke after cooling directly as formed coke output of products.
3. coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology according to claim 2, is characterized in that, can also allocate bottle coal into or rich coal is sent in stirred pot as binder mixture in described step 1).
4. coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology according to claim 3, is characterized in that, the quality proportioning of described binder mixture is bottle coal or rich coal 60%, coal-tar pitch 30% and coke tar refuse 10%.
5. coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology according to claim 2, it is characterized in that, the coal-tar pitch of allocating in described step 1) and coke tar refuse are first sent in coal-tar pitch melting pot after heat fused, send in stirred pot as binding agent.
6. coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology according to claim 2, it is characterized in that, the high temperature formed coke that in described step 5), charing produces is sent in water cooler Yu from the low-temperature carbonization carrier gas of pyrolysis of coal section and is carried out heat exchange, cooled formed coke is directly exported as product, and further heating in charing gas-fired furnace is sent in charing carrier gas after preheating.
7. coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation technology according to claim 1, is characterized in that, the coal gas of high temperature temperature producing in described step g is 650～750 DEG C, can, to the heating of smalls fast fluidization, complete flash pyrolysis.
8. for a coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation system for technique described in claim 1, it is characterized in that, comprising:
Raw coal preheating hierarchy system (100), beans pyrolysis oven (200), smalls pyrolysis oven (300), pyrolysis gas treatment system (400), formcoke from hot briquetting preparation system (500), pyrolysis gas-fired furnace (600);
The discharge port of described raw coal preheating hierarchy system (100) is connected with the feeding mouth of smalls pyrolysis oven with beans pyrolysis oven respectively;
The pyrolysis gas exit of described beans pyrolysis oven (200) is connected with the import of pyrolysis gas treatment system, and the material outlet of beans pyrolysis oven is connected with the feed(raw material)inlet of formcoke from hot briquetting preparation system;
The pyrolysis gas exit of described smalls pyrolysis oven (300) is connected with the thermal source entrance of beans pyrolysis oven, and the material outlet of smalls pyrolysis oven is connected with the feed(raw material)inlet of formcoke from hot briquetting preparation system;
Described pyrolysis gas treatment system (400) comprises meticulous fly-ash separator (410) and coal gas cooling device (420) and tar groove (430) and the tar filter vat (440) that pipeline is connected, the pyrolysis gas exit of described beans pyrolysis oven is connected with the import of this meticulous fly-ash separator, the material outlet of described coal gas cooling device is connected with the entrance of tar groove, the liquid exit of tar filter is directly exported tar products, and the solid outlet of tar filter is connected with formcoke from hot briquetting preparation system;
The gas exit of described coal gas cooling device (420) is divided into four tunnels, one tunnel is connected with the charing carrier gas inlet of formcoke from hot briquetting preparation system, one tunnel is connected with the fuel inlet of formcoke from hot briquetting preparation system, one tunnel is connected with the gas entry of pyrolysis gas-fired furnace, and another road is connected with the fuel inlet of pyrolysis gas-fired furnace;
The pyrolysis gas exit of described formcoke from hot briquetting preparation system (500) is connected with the thermal source entrance of beans pyrolysis oven, and the exhanst gas outlet of half formcoke from hot briquetting preparation system is directly communicated with atmosphere;
The coal gas of high temperature outlet of described gas-fired furnace (600) is connected with the thermal source entrance of smalls pyrolysis oven, and the exhanst gas outlet of gas-fired furnace is connected with the thermal source entrance of raw coal preheating hierarchy system.
9. coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation system according to claim 8, is characterized in that, described formcoke from hot briquetting preparation system (500) comprising:
Coal-tar pitch melting pot (510), stirred pot (520), forming machine (530), charring furnace (540), water cooler (550) and charing gas-fired furnace (560);
Feeding is connected the feeding mouth of described coal-tar pitch melting pot (510) with coal-tar pitch with the solid outlet of tar filter respectively, the discharge port of coal-tar pitch melting pot is connected with the binding agent entrance of stirred pot, and the exhanst gas outlet of coal-tar pitch melting pot is directly communicated with atmosphere;
The feed(raw material)inlet of described stirred pot (520) is connected with beans pyrolysis oven with smalls pyrolysis oven respectively, and the pyrolysis gas exit of stirred pot is connected with the import of meticulous fly-ash separator, and the discharge port of stirred pot is connected with the feeding mouth of forming machine;
The discharge port of described forming machine (530) is connected with the feeding mouth of charring furnace;
The pyrolysis gas exit of described charring furnace (540) is connected with the thermal source entrance of beans pyrolysis oven, and the discharge port of charring furnace is connected with the feeding mouth of water cooler;
The gas entry of described water cooler (550) is connected with the gas exit of described coal gas cooling device, and the discharge port of water cooler is directly exported formed coke product, and the gas exit of water cooler is connected with the gas entry of charing gas-fired furnace;
The fuel inlet of described charing gas-fired furnace (560) is connected with the gas exit of described coal gas cooling device, the outlet of charing gas-fired furnace coal gas of high temperature is connected with the gas entry of charring furnace, the exhanst gas outlet of charing gas-fired furnace is divided into two-way, one tunnel is connected with the smoke inlet of coal-tar pitch melting pot, and another road is connected with the thermal source entrance of raw coal preheating hierarchy system.
10. coal gas circulation coal wholegrain radial sector pyrolysis coupling formcoke from hot briquetting preparation system according to claim 8, is characterized in that, directly output coal dust product of the dust-removing powder outlet of described meticulous fly-ash separator.
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