CN104327872A - Technology for coking coal raw material containing low-rank coal and recycling coal pitch - Google Patents
Technology for coking coal raw material containing low-rank coal and recycling coal pitch Download PDFInfo
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- CN104327872A CN104327872A CN201410472004.XA CN201410472004A CN104327872A CN 104327872 A CN104327872 A CN 104327872A CN 201410472004 A CN201410472004 A CN 201410472004A CN 104327872 A CN104327872 A CN 104327872A
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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
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
- C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives
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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
- C10B53/08—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form in the form of briquettes, lumps and the like
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C1/00—Working-up tar
- C10C1/04—Working-up tar by distillation
- C10C1/16—Winning of pitch
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Abstract
The invention discloses a technology for coking a coal raw material containing low-rank coal and recycling coal pitch, comprising the following steps: (1) low-rank coal is crushed and then the crushed low-rank coal is mixed with an auxiliary agent to form a low-rank coal raw material, the low-rank coal raw material is then mixed with one or more selected from crushed medium-rank coal, high-rank coal or medium/high-rank coal to form feed coal, and the feed coal undergoes tamping molding by the use of tamping equipment; and (2) the molded feed coal is pushed into a coke oven and coked, coking temperature is controlled to be greater than 800 DEG C and coking time is controlled to be no less than 15 hours, an overflowing mixture of raw gas, tar and crude benzene is collected, and simultaneously a by-product coke is obtained, wherein the auxiliary agent is an organic binder with weightlessness being less than 50% under destructive distillation isolated from the air at 850 DEG C. By the technology for coking a coal raw material containing low-rank coal and recycling coal pitch, the problem that present tamping coke ovens have low availability and excess capacity exists in the coking industry is solved, and the problem that application of low-rank coal is limited because there is no large-scale industrial equipment is also solved.
Description
Technical field
The present invention relates to a kind of coking process of low-rank coal, be specifically related to a kind ofly carry out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch, belong to low-rank coal coking 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
The problem of large-scale application and existing coking industry production capacity surplus, problem that tamping coke furnace availability is low cannot be realized for solving low-rank coal in prior art, thus provide and a kind ofly coking is carried out to the coal raw material containing low-rank coal and reclaims the technique of coal-tar pitch.
For this reason, the technical scheme that the present invention takes is,
Coking carried out to the coal raw material containing low-rank coal and reclaim a technique for coal-tar pitch, comprising,
(1) low-rank coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with one or more in the scala media coal pulverized, high-order coal or middle high-order coal, described feed coal is carried out extrusion forming, and wherein said auxiliary agent is the organic binder bond being less than 50% 850 DEG C of isolated air destructive distillation weightlessness;
(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;
(3) separated and collected obtain raw gas, tar, crude benzol mixture, obtain raw gas, tar and crude benzol, and obtain coal-tar pitch at 300-450 DEG C of distillation tar further, described coal-tar pitch is less than 50% 800 DEG C of isolated air destructive distillation weightlessness, softening temperature is greater than 100 DEG C, can be used as described organic binder bond and is back to described step (1).
Above-mentioned carries out coking to the coal raw material containing low-rank coal and reclaims in the technique of coal-tar pitch, and described organic binder bond is the bituminous matter that softening temperature is greater than 100 DEG C.
Above-mentioned carries out coking to the coal raw material containing low-rank coal and reclaims in the technique of coal-tar pitch, and described auxiliary agent is coal-tar pitch or petroleum pitch, and its softening temperature is not less than 120 DEG C.
Above-mentioned carries out coking to the coal raw material containing low-rank coal and reclaims in the technique of coal-tar pitch, and the softening temperature of described pitch is not less than 140 DEG C.
Above-mentioned carries out coking to the coal raw material containing low-rank coal and reclaims in the technique of coal-tar pitch, and 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.
Above-mentioned carries out coking to the coal raw material containing low-rank coal and reclaims in the technique of coal-tar pitch, and in mass, the add-on of described auxiliary agent is the 5-40wt% of described low-rank coal quality.
Above-mentioned carries out coking to the coal raw material containing low-rank coal and reclaims in the technique of coal-tar pitch, and in mass, the add-on of described auxiliary agent is the 10-30wt% of described low-rank coal quality.
Above-mentioned carries out coking to the coal raw material containing low-rank coal and reclaims in the technique of coal-tar pitch, and in mass, the add-on of described low-rank coal is the 50-80wt% of feed coal quality.
Above-mentioned carries out coking to the coal raw material containing low-rank coal and reclaims in the technique of coal-tar pitch, and in mass, the add-on of described low-rank coal is the 50-70wt% of feed coal quality.
Above-mentioned carries out coking to the coal raw material containing low-rank coal and reclaims in the technique of coal-tar pitch, and the G value of described low-rank coal is less than 50, and volatile content is greater than 40%.
Above-mentioned carries out coking to the coal raw material containing low-rank coal and reclaims in the technique of coal-tar pitch, coking temperature 900-1200 DEG C in described step (2).
Above-mentioned carry out coking to the coal raw material containing low-rank coal and the technique reclaiming coal-tar pitch is carried out in tamping coke furnace, described feed coal carries out making firm by ramming shaping in tamping machine.
Compared with prior art, tool of the present invention has the following advantages,
(1) in the present invention, coking carried out to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch, not only solve that existing tamping coke furnace availability is low, the problem of coking industry production capacity surplus, also solve for low-rank coal owing to making it apply limited problem without large-scale industrialization equipment.
Be added in 800 DEG C of isolated air destructive distillation weightlessness in feed 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, oil gas total amount is made to increase production 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.
Distill to being separated the tar obtained the coal-tar pitch obtained further in carry out this technique, it is less than 50% 800 DEG C of isolated air destructive distillation weightlessness, and softening temperature is greater than 100 DEG C, can be back in this technique and use as organic binder bond.
(2) in the present invention, coking carried out to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch, 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 application coking is carried out to the coal raw material containing low-rank coal and the technique reclaiming coal-tar pitch is applicable to all low-rank coal, scala media coal, high-order coal or middle high-order coal raw material, for ease of explanation, in following embodiment, low-rank coal is for sub-bituminous coal or brown coal, and the coal raw material of non-low-rank coal is for 1/3 coking coal.
Wherein, the quality of the quality × 90%+ auxiliary agent of the non-low-rank coal of quality × 75%+ 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 be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, in mass, the add-on of auxiliary agent is the 40wt% of sub-bituminous coal quality, the add-on of described sub-bituminous coal is the 65wt% of described feed 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;
(3) common process is adopted to be separated raw gas, tar and crude benzol, and further tar is carried out at 300 DEG C distillation and obtain coal-tar pitch, described coal-tar pitch is less than 50% at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness after measured, and softening temperature is greater than 100 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 450Nm
3/ t dry coal, the amount of described tar is 54kg/t dry coal, and the amount of described byproduct coke is 570kg/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 72%, and volatile content is not more than 6%, and after coke screening, particle diameter is 30% 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 2
(1) sub-bituminous coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, in mass, auxiliary agent add the 35wt% that quality is sub-bituminous coal quality, the add-on of described sub-bituminous coal is the 50wt% of described feed 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;
(3) common process is adopted to be separated raw gas, tar and crude benzol, and further tar is carried out at 350 DEG C distillation and obtain coal-tar pitch, described coal-tar pitch is less than 50% at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness after measured, and softening temperature is greater than 100 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 500Nm
3/ t dry coal, the amount of described tar is 54kg/t dry coal, and the amount of described byproduct coke is 505kg/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 70%, and volatile content is not more than 5%, 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 3
(1) sub-bituminous coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, in mass, auxiliary agent add the 30wt% that quality is sub-bituminous coal quality, the add-on of described sub-bituminous coal is the 70wt% of described feed 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;
(3) common process is adopted to be separated raw gas, tar and crude benzol, and further tar is carried out at 400 DEG C distillation and obtain coal-tar pitch, described coal-tar pitch is less than 50% at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness after measured, and softening temperature is greater than 100 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 500Nm
3/ t dry coal, the amount of described tar is 54kg/t dry coal, and the amount of described byproduct coke is 505kg/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 74%, 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 60% of coke total mass in the particle total mass of more than 25mm.
Embodiment 4
(1) sub-bituminous coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, in mass, auxiliary agent add the 25wt% that quality is sub-bituminous coal quality, the add-on of described sub-bituminous coal for the G value of sub-bituminous coal described in the 75wt% of described feed coal quality be 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;
(3) common process is adopted to be separated raw gas, tar and crude benzol, and further tar is carried out at 450 DEG C distillation and obtain coal-tar pitch, described coal-tar pitch is less than 50% at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness after measured, and softening temperature is greater than 100 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 680Nm
3/ t dry coal, the amount of described tar is 93kg/t dry coal, and the amount of described byproduct coke is 390kg/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 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 60% of coke total mass in the particle total mass of more than 25mm.
Embodiment 5
(1) sub-bituminous coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, in mass, auxiliary agent add the 20wt% that quality is sub-bituminous coal quality, the add-on of described sub-bituminous coal is the 80wt% of described feed 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;
(3) common process is adopted to be separated raw gas, tar and crude benzol, and further tar is carried out at 320 DEG C distillation and obtain coal-tar pitch, described coal-tar pitch is less than 50% at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness after measured, and softening temperature is greater than 100 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 680Nm
3/ t dry coal, the amount of described tar is 90kg/t dry coal, and the amount of described byproduct coke is 407kg/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 56%, 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 60% of coke total mass in the particle total mass of more than 25mm.
Embodiment 6
(1) sub-bituminous coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, in mass, auxiliary agent add the 15wt% that quality is sub-bituminous coal quality, the add-on of described sub-bituminous coal is the 55wt% of described feed coal quality, the G value of described sub-bituminous coal is 15, volatile content is 55%, described auxiliary agent is the hard pitch of softening temperature 150 DEG C, 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;
(3) common process is adopted to be separated raw gas, tar and crude benzol, and further tar is carried out at 380 DEG C distillation and obtain coal-tar pitch, described coal-tar pitch is less than 50% at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness after measured, and softening temperature is greater than 100 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 570Nm
3/ t dry coal, the amount of described tar is 62kg/t dry coal, and the amount of described byproduct coke is 492kg/t dry coal, and the amount of described crude benzol is 18kg/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 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 7
(1) sub-bituminous coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, in mass, auxiliary agent add the 10wt% that quality is sub-bituminous coal quality, the add-on of described sub-bituminous coal is the 60wt% of described feed coal quality, the G value of described sub-bituminous coal is 20, volatile content is 50%, described auxiliary agent is the hard pitch of softening temperature 170 DEG C, 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;
(3) common process is adopted to be separated raw gas, tar and crude benzol, and further tar is carried out at 420 DEG C distillation and obtain coal-tar pitch, described coal-tar pitch is less than 50% at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness after measured, and softening temperature is greater than 100 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 550_Nm
3/ t dry coal, the amount of described tar is 54kg/t dry coal, the amount 600kg/t dry coal of described byproduct coke, and the amount of described crude benzol is 16kg/t dry coal.In mass, in coke, solids carbon content is not less than 70%, and volatile content is not more than 3%, and after coke screening, particle diameter is 10% 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 8
(1) sub-bituminous coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, in mass, auxiliary agent add the 5wt% that quality is sub-bituminous coal quality, the add-on of described sub-bituminous coal is the 50wt% of described feed coal quality, the G value of described sub-bituminous coal is 15, volatile content is 45%, described auxiliary agent is the hard pitch of softening temperature 190 DEG C, 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;
(3) common process is adopted to be separated raw gas, tar and crude benzol, and further tar is carried out at 300 DEG C distillation and obtain coal-tar pitch, described coal-tar pitch is less than 50% at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness after measured, and softening temperature is greater than 100 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 380Nm
3/ t dry coal, the amount of described tar is 46kg/t dry coal, and the amount of described byproduct coke is 653kg/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 72%, and volatile content is not more than 4%, and after coke screening, particle diameter is 10% 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 be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, in mass, auxiliary agent add the 10wt% that quality is brown coal quality, the add-on of described brown coal is the 80wt% of described feed 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;
(3) common process is adopted to be separated raw gas, tar and crude benzol, and further tar is carried out at 350 DEG C distillation and obtain coal-tar pitch, described coal-tar pitch is less than 50% at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness after measured, and softening temperature is greater than 100 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 550Nm
3/ t dry coal, the amount of described tar is 62kg/t dry coal, and the amount of described byproduct coke is 458kg/t dry coal, and the amount of described crude benzol is 18kg/t dry coal.In mass, in coke, solids carbon content is not less than 55%, 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 60% of coke total mass in the particle total mass of more than 25mm.
Embodiment 10
(1) brown coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, in mass, auxiliary agent add the 30wt% that quality is brown coal quality, the add-on of described brown coal is the 60wt% of described feed 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;
(3) common process is adopted to be separated raw gas, tar and crude benzol, and further tar is carried out at 400 DEG C distillation and obtain coal-tar pitch, described coal-tar pitch is less than 50% at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness after measured, and softening temperature is greater than 100 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 400Nm
3/ t dry coal, the amount of described tar is 48kg/t dry coal, and the amount of described byproduct coke is 635kg/t dry coal, and the amount of described crude benzol is 17kg/t dry coal.In mass, in coke, solids carbon content is not less than 75%, 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.
Embodiment 11
(1) brown coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, described auxiliary agent is the coal-tar pitch that embodiment 10 prepares, in mass, auxiliary agent add the 30wt% that quality is brown coal quality, the add-on of described brown coal is the 60wt% of described feed coal quality, the G value of described brown coal is 20, volatile content is 55%, described auxiliary agent is the hard pitch of softening temperature 150 DEG C, 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;
(3) common process is adopted to be separated raw gas, tar and crude benzol, and further tar is carried out at 450 DEG C distillation and obtain coal-tar pitch, described coal-tar pitch is less than 50% at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness after measured, and softening temperature is greater than 100 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 410Nm
3/ t dry coal, the amount of described tar is 48.5kg/t dry coal, and the amount of described byproduct coke is 630kg/t dry coal, and the amount of described crude benzol is 17kg/t dry coal.In mass, in coke, solids carbon content is not less than 75%, 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 shaping to 1/3 coking coal, 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;
(3) adopt common process to be separated raw gas, tar and crude benzol, and further tar carried out at 400 DEG C distillation and obtain coal-tar pitch, after measured described coal-tar pitch at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness 55%, softening temperature 80 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 365Nm
3/ t dry coal, the amount of described tar is 34.9kg/t dry coal, and the amount of described byproduct coke is the 677kg/t dry coal of ton dry coal, and the amount of described crude benzol is 10.6kg/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 60% 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.
Comparative example 2
(1) brown coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with 1/3 coking coal pulverized, tamping machine is adopted to make firm by ramming shaping to feed coal, wherein, in mass, the add-on of described brown coal is the 60wt% of described feed coal quality, 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;
(3) adopt common process to be separated raw gas, tar and crude benzol, and further tar carried out at 400 DEG C distillation and obtain coal-tar pitch, after measured described coal-tar pitch at described coal-tar pitch 800 DEG C of isolated air destructive distillation weightlessness 66%, softening temperature 60 DEG C.
In the present embodiment, the amount of the described raw gas obtained is 320Nm
3/ ton dry coal, the amount of described tar is 44kg/t dry coal, and the amount of described byproduct coke is 870kg/t dry coal, and the amount of described crude benzol is 18kg/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.
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 (12)
1. coking carried out to the coal raw material containing low-rank coal and reclaim a technique for coal-tar pitch, it is characterized in that,
(1) low-rank coal pulverized and be mixed to form low-rank coal raw material with auxiliary agent, and then be mixed to form feed coal with one or more in the scala media coal pulverized, high-order coal or middle high-order coal, described feed coal is carried out extrusion forming, and wherein said auxiliary agent is the organic binder bond being less than 50% 850 DEG C of isolated air destructive distillation weightlessness;
(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;
(3) separated and collected obtain raw gas, tar, crude benzol mixture, obtain raw gas, tar and crude benzol, and obtain coal-tar pitch at 300-450 DEG C of distillation tar further, described coal-tar pitch is less than 50% 800 DEG C of isolated air destructive distillation weightlessness, softening temperature is greater than 100 DEG C, can be used as described organic binder bond and is back to described step (1).
2. according to claim 1ly carry out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch, it is characterized in that, described organic binder bond is the bituminous matter that softening temperature is greater than 100 DEG C.
3. according to claim 1 and 2ly carry out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch, it is characterized in that, described auxiliary agent is coal-tar pitch or petroleum pitch, and the softening temperature of described pitch is not less than 120 DEG C.
4. according to claim 3ly carry out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch, it is characterized in that, the softening temperature of described pitch is not less than 140 DEG C.
5. according to claim 3ly carry out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch, it 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 arbitrary described the carrying out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch 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. according to claim 6ly carry out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch, it is characterized in that, in mass, the add-on of described auxiliary agent is the 10-30wt% of described low-rank coal quality.
8., according to arbitrary described the carrying out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch of claim 1-7, it is characterized in that, in mass, the add-on of described low-rank coal is the 50-80wt% of feed coal quality.
9., according to arbitrary described the carrying out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch of claim 1-8, it is characterized in that, in mass, the add-on of described low-rank coal is the 50-70wt% of feed coal quality.
10. according to claim 9ly carry out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch, it is characterized in that, the G value of described low-rank coal is less than 50, and volatile content is greater than 40%.
11., according to arbitrary described the carrying out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch of claim 1-10, is characterized in that, coking temperature 900-1200 DEG C in described step (2).
12. according to claim 11ly carry out coking to the coal raw material containing low-rank coal and reclaim the technique of coal-tar pitch, and it is characterized in that, described coking process carries out in tamping coke furnace, and described feed coal carries out making firm by ramming shaping in tamping machine.
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| CN106929049A (en) * | 2015-12-30 | 2017-07-07 | 北京三聚环保新材料股份有限公司 | It is a kind of that coking is carried out to the moulded coal containing low-order coal and biological particles and the technique of coal tar pitch is reclaimed |
| CN106929040A (en) * | 2015-12-30 | 2017-07-07 | 北京三聚环保新材料股份有限公司 | It is a kind of that coking is carried out to the moulded coal containing low-order coal and granulated garbage and the technique of coal tar pitch is reclaimed |
| CN106929070A (en) * | 2015-12-30 | 2017-07-07 | 北京三聚环保新材料股份有限公司 | It is a kind of that coking is carried out to the moulded coal containing low-order coal and particulate matter and the technique of coal tar pitch is reclaimed |
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