CN105400533A - Low-rank coal coking process - Google Patents
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Abstract
The present invention discloses a low-rank coal coking process, which comprises: (1) crushing low-rank coal, mixing the crushed low-rank coal and an auxiliary agent, and carrying out stamp-charging molding on the raw material coal by using stamp-charging equipment; and (2) pushing the molded raw material coal into a coke oven, coking, and collecting the overflowed crude coal gas, tar and crude benzene mixture while obtaining the byproduct coke, wherein the coking temperature is controlled at more than 800 DEG C, the coking time is not less than 15 h, and the auxiliary agent is an organic binder with air isolated dry distillation weightlessness of less than 50% at a temperature of 850 DEG C. According to the present invention, with the low-rank coal coking process, the problems of low existing stamp-charging coke oven utilization rate and excess coking industry production capacity are solved, and the problem that the application of the low-rank coal is limited due to no large-scale industrial equipment is solved.
Description
Technical field
The present invention relates to a kind of coking process, being specifically related to a kind of take low-rank coal as the coking process of raw material, belongs to low-rank coal transformation technology field.
Background technology
Coal is the main energy sources of China, in primary energy structure, account for 70%.In very long geological changes process, the formation of coal, by the effect of many factors, causes categories of coal various.According to the difference of structure and composition, coal is divided into the large class of brown coal, bituminous coal and hard coal 3, and its metabituminous coal is divided into again lower-grade metamorphic bituminous and mesometamorphism bituminous coal, is lower-grade metamorphic bituminously sub-bituminous coal again, is referred to as " low-rank coal " together with brown coal.Low-rank coal is the product at incoalation initial stage, have that carbon content is low, moisture is high, easy efflorescence, easily spontaneous combustion, fugitive constituent be high, the feature of immersion intensity difference, anti-dropping intensity difference, these characteristics limit the direct exploitation to low-rank coal, but according to statistics, China's low-rank coal reserves account for the whole nation and have verified more than 55% of coal reserves, reach 5,612 hundred million tons, this causes a kind of waste of resource undoubtedly.And along with day by day increasing of domestic energy demand and falling sharply of high-quality coal stock number, the conversion of low-rank coal fully utilizes the focus becoming people and day by day pay close attention to.
The process for upgrading of low-rank coal is one of means of low-rank coal trans-utilization, its be under isolated air or nonoxidizing atmosphere condition, low-rank coal is heated to 200-800 DEG C carry out in low temperature upgrading, finally obtain the working method of tar, coal gas and semicoke.But current low-rank coal upgrading technology is all in experimental study and through engineering approaches original application stage, there is not the equipment making its heavy industrialization apply, thus limit the exploitation of low-rank coal.
Tamping coke furnace is the maximization equipment adopted in the coking process of coal, its floor space is wide, investment capital cost is large, the coking process adopting tamping coke furnace to carry out coking mainly refers to that high-temperature coking is to obtain coke and to reclaim chemical products, its coke product is metallurgical coke or chemical industry Jiao mainly, due to industrial to the quality requirements of metallurgical coke or chemical industry Jiao, the coal raw material making it adopt mainly comprises coking coal, 1/3 coking coal, bottle coal, rich coal, lean coal, the coals such as meager lean coal, belong to mesometamorphism bituminous coal, due to the shortage of coal resources in recent years, especially for the minimizing of high-quality coal raw material in coking industry, the raw materials cost of coking industry is grown with each passing day, in addition iron and steel in recent years, metallurgy etc. needs the decline of the industry of metallurgical coke or chemical industry Jiao in a large number, on the one hand, the price of coke product is sharply reduced, the rise of cost of material, the decline of product price, China's major part coking industry economic benefit is seriously glided, on the other hand, the minimizing of coke demand forces coke-oven plant to reduce coke output, but due to tamping coke furnace once out of servicely namely scrap, therefore in order to protect the tamping coke furnace equipment furnishing a huge amount of money for invest to build, it has to maintain the operation of coke oven in minimum level, not only reduce the availability of tamping coke furnace, also cause the production capacity surplus of coking industry.How to save the coking industry being on the verge of negative growth in sum, improve the availability of tamping coke furnace, the problem solving coking industry production capacity surplus has become coking industry letter major issue to be solved.
As everyone knows, its object of traditional coking process is mainly in order to obtain coke, particularly metallurgical coke, first to solve coking industry negative growth problem, significantly reduce coking industry desired raw material coal price lattice or improve coke price or the two to have concurrently be selectable approach simultaneously, at present, coke price cannot realize getting warm again after a cold spell in a short time, so can only reduce feed coal price, but because Coke Industry is for the requirement of coke quality, then be traced in the requirement to feed coal, must the index of its volatile matter of considered critical and ash content.Low-rank coal is the coal that in feed coal, price is comparatively cheap, if effectively can utilize low-rank coal, so will contribute to coking industry and extricate oneself from a plight.But low-rank coal has high, the easy efflorescence of volatile matter, feature that ash content is high, and the index of the volatile matter that coking proposes feed coal and ash content is very strict, and this is just doomed the problem by using low-rank coal cannot solve coking industry feed coal price.
Summary of the invention
Cannot realize problem and the coking process expensive starting materials of large-scale application, the problem that coking industry economic benefit is low for solving low-rank coal in prior art, thus to provide a kind of take low-rank coal as the coking process of raw material.
For this reason, the technical scheme that the present invention takes is,
A coking process for low-rank coal, comprises,
(1) low-rank coal pulverized and mix with auxiliary agent, feed coal is carried out extrusion forming; (2) pushed in coke oven by shaping feed coal and carry out coking, control coking temperature and be greater than 800 DEG C, scorch time is not less than 15 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Wherein said auxiliary agent is the organic binder bond being less than 50% 850 DEG C of isolated air destructive distillation weightlessness.
In the coking process of above-mentioned low-rank coal, described organic binder bond is the bituminous matter that softening temperature is greater than 100 DEG C.
In the coking process of above-mentioned low-rank coal, described auxiliary agent is coal-tar pitch or petroleum pitch, and its softening temperature is not less than 120 DEG C.
In the coking process of above-mentioned low-rank coal, the softening temperature of described pitch is not less than 140 DEG C.
In the coking process of above-mentioned low-rank coal, described pitch is hard pitch, and in mass, the fixed carbon content of described hard pitch is more than 25%, and ratio of carbon-hydrogen is 8-11.
In the coking process of above-mentioned low-rank coal, in mass, the add-on of described auxiliary agent is the 5-40wt% of described low-rank coal quality.
In the coking process of above-mentioned low-rank coal, in mass, the add-on of described auxiliary agent is the 10-30wt% of described low-rank coal quality.
In the coking process of above-mentioned low-rank coal, the G value of described low-rank coal is less than 50, and volatile content is greater than 40%.
In the coking process of above-mentioned low-rank coal, coking temperature 950-1100 DEG C in described step (2).
Compared with prior art, tool of the present invention has the following advantages,
(1) coking process of low-rank coal in the present invention, not only solves that existing tamping coke furnace availability is low, the problem of coking industry production capacity surplus, also solves for low-rank coal owing to making it apply limited problem without large-scale industrialization equipment.
Be added in 850 DEG C of isolated air destructive distillation weightlessness in low-rank coal in the application and be less than the bituminous matter of 50% as binding agent, be conducive to low-rank coal on the one hand shaping in tamping machine, thus can push in tamping coke furnace and carry out coking, its solid product not easily efflorescence after the coking of another aspect low-rank coal completes, be easy to the coke pushing of tamping coke furnace, after the most important thing is that described auxiliary agent mixes with low order coal facies, effective constituent wherein in auxiliary agent contributes to high molecular fracture in the degraded at high temperature of high molecular polymer in low-rank coal and low-rank coal, thus the output of oil gas in raising technological process, make oil, gas volume increase more than 10%.And the main component in raw gas is hydrogen and methane, at present, the price of hydrogen, methane is far above the price of coke, the increase of its output improves the economic benefit of enterprise, meanwhile, with the coking process that middle and high rank coal is raw material compared to prior art, adopt low-rank coal as the raw material of coking process, raw materials cost can be reduced to a great extent, simultaneously significant to the development and utilization of low-rank coal.
(2) coking process of low-rank coal in the present invention, described auxiliary agent is the pitch that coal or petroleum raw material reaction are formed, and the softening temperature of described pitch is not less than 120 DEG C, improve low-rank coal coking complete after the quality of its solid product-coke, in coke, volatile matter is not more than the by-product coke that 3-4% makes to obtain and can be used for generating, gas making and other chemical industry object.
Embodiment
The coking process of the low-rank coal of the application is applicable to all low-rank coal, and for ease of illustrating, following embodiment is for sub-bituminous coal or brown coal.
Wherein, the quality of the quality × 75%+ auxiliary agent of the quality=low-rank coal of dry coal, what " kg/t dry coal " referred to dry coal per ton obtains product how many kilograms.
Embodiment 1
(1) sub-bituminous coal pulverized and mix with auxiliary agent, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein auxiliary agent add the 40wt% that quality is sub-bituminous coal quality, the G value of described sub-bituminous coal is 45, volatile content is 65%, described auxiliary agent is the bituminous matter of softening temperature 105 DEG C, and described bituminous matter is 850 DEG C of isolated air destructive distillation weightlessness 45%;
(2) shaping feed coal pushed in coke oven carry out coking, control coking temperature 850 DEG C, scorch time 16 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 650Nm
3/ t dry coal, the amount of described tar is 109kg/t dry coal, and the amount of described byproduct coke is 390kg/t dry coal, and the amount of described crude benzol is 31kg/t dry coal.In mass, in coke, solids carbon content is not less than 60%, and volatile content is not more than 6%, and after coke screening, particle diameter is 20% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 60% of coke total mass in the particle total mass of more than 25mm.
Embodiment 2
(1) sub-bituminous coal pulverized and mix with auxiliary agent, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein auxiliary agent add the 35wt% that quality is sub-bituminous coal quality, the G value of described sub-bituminous coal is 40, volatile content is 70%, described auxiliary agent is the bituminous matter of softening temperature 115 DEG C, and described bituminous matter is 850 DEG C of isolated air destructive distillation weightlessness 40%;
(2) shaping feed coal pushed in coke oven carry out coking, control coking temperature 900 DEG C, scorch time 15.5 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 680Nm
3/ ton dry coal, the amount of described tar is 117kg/t dry coal, and the amount of described byproduct coke is 360kg/t dry coal, and the amount of described crude benzol is 33kg/t dry coal.In mass, in coke, solids carbon content is not less than 58%, and volatile content is not more than 5%, and after coke screening, particle diameter is 15% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 55% of coke total mass in the particle total mass of more than 25mm.
Embodiment 3
(1) sub-bituminous coal pulverized and mix with auxiliary agent, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein auxiliary agent add the 30wt% that quality is sub-bituminous coal quality, the G value of described sub-bituminous coal is 35, volatile content is 45%, described auxiliary agent is the bituminous matter of softening temperature 120 DEG C, and described bituminous matter is 850 DEG C of isolated air destructive distillation weightlessness 42%;
(2) shaping feed coal pushed in coke oven carry out coking, control coking temperature 950 DEG C, scorch time 17 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 450Nm
3/ t dry coal, the amount of described tar is 45kg/t dry coal, and the amount of described byproduct coke is 586kg/t dry coal, and the amount of described crude benzol is 15kg/t dry coal.In mass, in coke, solids carbon content is not less than 72%, and volatile content is not more than 4%, and after coke screening, particle diameter is 15% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 55% of coke total mass in the particle total mass of more than 25mm.
Embodiment 4
(1) sub-bituminous coal pulverized and mix with auxiliary agent, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein auxiliary agent add the 25wt% that quality is sub-bituminous coal quality, the G value of described sub-bituminous coal is 30, volatile content is 65%, described auxiliary agent is the bituminous matter of softening temperature 130 DEG C, and described bituminous matter is 850 DEG C of isolated air destructive distillation weightlessness 40%;
(2) shaping feed coal pushed in coke oven carry out coking, control coking temperature 1000 DEG C, scorch time 16.5 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 720Nm
3/ t dry coal, the amount of described tar is 117kg/t dry coal, and the amount of described byproduct coke is 360kg/t dry coal, and the amount of described crude benzol is 33kg/t dry coal.In mass, in coke, solids carbon content is not less than 58%, and volatile content is not more than 4%, and after coke screening, particle diameter is 15% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 55% of coke total mass in the particle total mass of more than 25mm.
Embodiment 5
(1) sub-bituminous coal pulverized and mix with auxiliary agent, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein auxiliary agent add the 20wt% that quality is sub-bituminous coal quality, the G value of described sub-bituminous coal is 20, volatile content is 60%, described auxiliary agent is the bituminous matter of softening temperature 140 DEG C, and described bituminous matter is 850 DEG C of isolated air destructive distillation weightlessness 35%;
(2) shaping feed coal pushed in coke oven carry out coking, control coking temperature 1100 DEG C, scorch time 18 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 650Nm
3/ t dry coal, the amount of described tar is 101kg/t dry coal, and the amount of described byproduct coke is 402kg/t dry coal, and the amount of described crude benzol is 29kg/t dry coal.In mass, in coke, solids carbon content is not less than 64%, and volatile content is not more than 4%, and after coke screening, particle diameter is 15% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 55% of coke total mass in the particle total mass of more than 25mm.
Embodiment 6
(1) sub-bituminous coal pulverized and mix with auxiliary agent, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein auxiliary agent add the 15wt% that quality is sub-bituminous coal quality, the G value of described sub-bituminous coal is 15, volatile content is 55%, and described auxiliary agent is the hard pitch of softening temperature 150 DEG C, and described hard pitch is less than 40% 850 DEG C of isolated air destructive distillation weightlessness, fixed carbon content 28%, ratio of carbon-hydrogen is 8;
(2) shaping feed coal pushed in coke oven carry out coking, control coking temperature 950 DEG C, scorch time 20 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 600Nm
3/ t dry coal, the amount of described tar is 93kg/t dry coal, and the amount of described byproduct coke is 448kg/t dry coal, and the amount of described crude benzol is 27kg/t dry coal.In mass, in coke, solids carbon content is not less than 64%, and volatile content is not more than 5%, and after coke screening, particle diameter is 15% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 55% of coke total mass in the particle total mass of more than 25mm.
Embodiment 7
(1) sub-bituminous coal pulverized and mix with auxiliary agent, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein auxiliary agent add the 10wt% that quality is sub-bituminous coal quality, the G value of described sub-bituminous coal is 20, volatile content is 50%, and described auxiliary agent is the hard pitch of softening temperature 170 DEG C, and described hard pitch is 850 DEG C of isolated air destructive distillation weightlessness 42%, fixed carbon content 30%, ratio of carbon-hydrogen is 11;
(2) shaping feed coal pushed in coke oven carry out coking, control coking temperature 1200 DEG C, scorch time 24 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 600Nm
3/ t dry coal, the amount of described tar is 78kg/t dry coal, and the amount of described byproduct coke is 480kg/t dry coal, and the amount of described crude benzol is 22kg/t dry coal.In mass, in coke, solids carbon content is not less than 55%, and volatile content is not more than 3%, and after coke screening, particle diameter is 5% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 50% of coke total mass in the particle total mass of more than 25mm.
Embodiment 8
(1) sub-bituminous coal pulverized and mix with auxiliary agent, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein auxiliary agent add the 5wt% that quality is sub-bituminous coal quality, the G value of described sub-bituminous coal is 15, volatile content is 45%, and described auxiliary agent is the hard pitch of softening temperature 190 DEG C, and described hard pitch is 850 DEG C of isolated air destructive distillation weightlessness 45%, fixed carbon content 28%, ratio of carbon-hydrogen is 10;
(2) shaping feed coal pushed in coke oven carry out coking, control coking temperature 950 DEG C, scorch time 20 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 435Nm
3/ t dry coal, the amount of described tar is 46kg/t dry coal, and the amount of described byproduct coke is 650kg/t dry coal, and the amount of described crude benzol is 16kg/t dry coal.In mass, in coke, solids carbon content is not less than 64%, and volatile content is not more than 4%, and after coke screening, particle diameter is 5% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 55% of coke total mass in the particle total mass of more than 25mm.
Embodiment 9
(1) brown coal pulverized and mix with auxiliary agent, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein auxiliary agent add the 10wt% that quality is brown coal quality, the G value of described brown coal is 20, volatile content is 55%, described auxiliary agent is the bituminous matter that softening temperature is greater than 110 DEG C, and described bituminous matter is 850 DEG C of isolated air destructive distillation weightlessness 45%;
(2) shaping feed coal pushed in coke oven carry out coking, control coking temperature 850 DEG C, scorch time 16 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 420Nm
3/ t dry coal, the amount of described tar is 93kg/t dry coal, and the amount of described byproduct coke is 544kg/t dry coal, and the amount of described crude benzol is 27kg/t dry coal.In mass, in coke, solids carbon content is not less than 57%, and volatile content is not more than 6%, and after coke screening, particle diameter is 15% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 50% of coke total mass in the particle total mass of more than 25mm.
Embodiment 10
(1) brown coal pulverized and mix with auxiliary agent, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein auxiliary agent add the 30wt% that quality is brown coal quality, the G value of described brown coal is 20, volatile content is 55%, and described auxiliary agent is the hard pitch of softening temperature 150 DEG C, and described hard pitch is 850 DEG C of isolated air destructive distillation weightlessness 30%, fixed carbon content 30%, ratio of carbon-hydrogen 8;
(2) shaping feed coal pushed in coke oven carry out coking, control coking temperature 950 DEG C, scorch time 24 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 380Nm
3/ t dry coal, the amount of described tar is 53kg/t dry coal, and the amount of described byproduct coke is 667kg/t dry coal, and the amount of described crude benzol is 27kg/t dry coal.In mass, in coke, solids carbon content is not less than 72%, and volatile content is not more than 4%, and after coke screening, particle diameter is 20% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 55% of coke total mass in the particle total mass of more than 25mm.
Comparative example 1
Adopt tamping machine to make firm by ramming coking coal shaping, shaping feed coal is pushed in coke oven and carries out coking, control coking temperature 950 DEG C, scorch time 24 hours, collect the mixture of the raw gas of spilling, tar, crude benzol, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 333Nm
3/ t dry coal, the amount of described tar is 27.3kg/t dry coal, and the amount of described byproduct coke is 767kg/t dry coal, and the amount of described crude benzol is 8.3kg/t dry coal.In mass, in coke, solids carbon content is not less than 72%, and volatile content is not more than 5%, and after coke screening, particle diameter is 61% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 72% of coke total mass in the particle total mass of more than 25mm.
Comparative example 2
(1) brown coal pulverized and mix with auxiliary agent, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein auxiliary agent add the 60wt% that quality is brown coal quality, the G value of described brown coal is 20, volatile content is 55%, described auxiliary agent is the bituminous matter of softening temperature 80 DEG C, and described bituminous matter is 850 DEG C of isolated air destructive distillation weightlessness 60%;
(2) shaping feed coal pushed in coke oven carry out coking, control coking temperature 950 DEG C, scorch time 24 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Adopt common process to be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 320Nm
3/ ton dry coal, the amount of described tar is 50kg/t dry coal, and the amount of described byproduct coke is 873kg/t dry coal, and the amount of described crude benzol is 5kg/t dry coal.In mass, in coke, solids carbon content is not less than 58%, and volatile content is not more than 4%, and after coke screening, particle diameter is 15% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 55% of coke total mass in the particle total mass of more than 25mm.
Comparative example 3
G value cannot be made to be 20 owing to using the tamping machine in existing tamping coke furnace, volatile content is the Moulding Process of Brown Coal of 55%, namely tamping coke furnace cannot be adopted to apply low-rank coal, imitate and test with the can of tamping coke furnace equivalent environment, carry out low-rank coal coking process, first, adopt the pressure of 15MPa to make Moulding Process of Brown Coal, then control coking temperature 950 DEG C, scorch time 24 hours, collect the mixture of the raw gas of spilling, tar, crude benzol, obtain byproduct coke simultaneously; Be separated raw gas, tar, and from tar, be separated crude benzol further, the amount of the described raw gas obtained is 350Nm
3/ t dry coal, the amount of described tar is 40kg/t dry coal, and the amount of described byproduct coke is 573kg/t dry coal, and the amount of described crude benzol is 4kg/t dry coal.In mass, in coke, solids carbon content is not less than 50%, and volatile content is not more than 8%, and after coke screening, particle diameter is 5% of coke total mass in the particle total mass of more than 40mm, and particle diameter is 50% of coke total mass in the particle total mass of more than 25mm.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (10)
1. a coking process for low-rank coal, is characterized in that,
(1) low-rank coal pulverized and mix with auxiliary agent, feed coal is carried out extrusion forming;
(2) pushed in coke oven by shaping feed coal and carry out coking, control coking temperature and be greater than 800 DEG C, scorch time is not less than 15 hours, collect overflow raw gas, tar, crude benzol mixture, obtain byproduct coke simultaneously;
Wherein said auxiliary agent is the organic binder bond being less than 50% 850 DEG C of isolated air destructive distillation weightlessness.
2. the coking process of low-rank coal according to claim 1, is characterized in that, described organic binder bond is the bituminous matter that softening temperature is greater than 100 DEG C.
3. the coking process of low-rank coal according to claim 1 and 2, is characterized in that, described auxiliary agent is coal-tar pitch or petroleum pitch, and its softening temperature is not less than 120 DEG C.
4. the coking process of low-rank coal according to claim 3, is characterized in that, the softening temperature of described pitch is not less than 140 DEG C.
5. the coking process of low-rank coal according to claim 3, is characterized in that, described pitch is hard pitch, and in mass, the fixed carbon content of described hard pitch is more than 25%, and ratio of carbon-hydrogen is 8-11.
6., according to the coking process of the arbitrary described low-rank coal of claim 1-5, it is characterized in that, in mass, the add-on of described auxiliary agent is the 5-40wt% of described low-rank coal quality.
7. the coking process of low-rank coal according to claim 6, is characterized in that, in mass, the add-on of described auxiliary agent is the 10-30wt% of described low-rank coal quality.
8. the coking process of low-rank coal according to claim 7, is characterized in that, the G value of described low-rank coal is less than 50, and volatile content is greater than 40%.
9. according to the coking process of the arbitrary described low-rank coal of claim 1-8, it is characterized in that, in described step (2), coking temperature is 950-1100 DEG C.
10., according to the coking process of the arbitrary described low-rank coal of claim 1-9, it is characterized in that, described coking process carries out in tamping coke furnace, and described feed coal carries out shaping in tamping machine.
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