CN104004547B - Coal gasification and coal coking co-supply and cogeneration system and method - Google Patents

Coal gasification and coal coking co-supply and cogeneration system and method Download PDF

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CN104004547B
CN104004547B CN201410236111.2A CN201410236111A CN104004547B CN 104004547 B CN104004547 B CN 104004547B CN 201410236111 A CN201410236111 A CN 201410236111A CN 104004547 B CN104004547 B CN 104004547B
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coal
unit
gas
synthesis gas
coking
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CN201410236111.2A
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CN104004547A (en
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钱宇
满奕
杨思宇
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华南理工大学
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONAGEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/02Fixed-bed gasification of lump fuel
    • C10J3/06Continuous processes
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/02Fixed-bed gasification of lump fuel
    • C10J3/20Apparatus; Plants
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46Gasification of granular or pulverulent flues in suspension
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46Gasification of granular or pulverulent flues in suspension
    • C10J3/48Apparatus; Plants
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72Other features
    • C10J3/82Gas withdrawal means
    • C10J3/84Gas withdrawal means with means for removing dust or tar from the gas
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/54Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids

Abstract

The invention discloses a coal gasification and coal coking co-supply and cogeneration system and method. The method comprises the following steps: preparing a coal-gasified crude synthesis gas from a part of raw material coal by a coal gasification process; obtaining clean coal-gasified crude synthesis gas and carbon dioxide after cooling, transforming and purifying the coal-gasified crude synthesis gas; feeding the clean coal-gasified crude synthesis gas into a chemical synthesis process to prepare a chemical product; preparing coke and a crude coke oven gas from the other part of raw material coal by the coal coking process, enabling a part of obtained coke to react with the carbon dioxide obtained in the coal gasification process to prepare carbon monoxide; purifying the obtained crude coke oven gas to obtain a clean coke oven gas, and then mixing the carbon monoxide with the clean coke oven gas according to a ratio, and then preparing a coal-coked synthesis gas; and feeding the coal-coked synthesis gas into a chemical synthesis process to prepare a chemical product. The coal utilization efficiency is effectively improved while energy conservation and emission reduction are realized in a co-supply manner of recovering CO2 produced in the coal gasification process and transporting to the coal coking process to generate the synthesis gas.

Description

A kind of coal gasification and coking of coal alliance co-generation system and method
Technical field
The invention belongs to the energy and chemical technology field and in particular to a kind of coal gasification and coking of coal alliance co-generation system and Method.
Background technology
Coal gasification and coking of coal are two main paths that coal comprehensively utilizes.Coal gasification course is to produce Coal Gasification Synthesis gas, synthesis gas passes through the conversion of water coal and adjusts hydrogen-carbon ratio, is used for chemical industry synthesis afterwards.It is former that coking of coal process passes through high-temperature retorting Coal produces coke, obtains the products such as oven gas, coal tar simultaneously.
Core Coal Chemical Industry process is turned to coal gas and there is high energy consumption and the accumulative co of process2The problems such as discharge capacity is big.Cause co2 Big and high energy consumption the main cause of discharge capacity is, the hydrogen-carbon ratio only 0.7 about of crude synthesis gas produced by coal gasification course, and The hydro carbons of synthesis hydrogen-rich or alcohol ethers product, generally require hydrogen-carbon ratio and reach more than 2, therefore crude synthesis gas need to enter the conversion of water coal Unit, the co in synthesis gas is converted into h2And co2, thus cause substantial amounts of co2Discharge and the waste of carbon, conversion Process consumes substantial amounts of energy simultaneously.
Turn to the Coal Chemical Industry process of core with coal tar, presently, there are coke production capacity surplus and oven gas a large amount of waste ask Topic.According to statistics, the annual oven gas yield of China is about 35,000,000,000 standard cubic meters, and 20% is used for burning as fuel, and remaining is big Part oven gas is discharged into air.The technology such as preparing methanol from coke oven gas or synthetic natural gas of some units research and development at present, but This all has a problem that, that is, the hydrogen-carbon ratio of oven gas reaches more than 6, still has a large amount of h after synthesis chemical products2It is not utilized, Separate these h2Produce huge energy consumption, and the h as the high-efficiency cleaning energy2It is not used effectively, mostly directly being burnt is yet Factory's heat supply.
At present coal gasification and coking of coal production process are separate although coal based on coal gasification and coking of coal Chemical process also begins to consider reducing energy consumption, improves energy utilization rate and control many problems such as pollution, but divides and produce System pursues certain target often unilaterally so that point product system is difficult to overcome high energy consumption, chemical energy to utilize process losses simultaneously It is big and the problems such as environmental pollution is serious.
The few hydrogen of synthesis gas from coal gasification richness carbon, the few carbon of coking of coal oven gas hydrogen-rich, this two coal base chemical processes are combined Come, can learn from other's strong points to offset one's weaknesses effective reduction co2Discharge and energy consumption.Research shows, under suitable oven gas and synthesis gas proportioning, alliance Process can reduce carbon emission 90% than single production process, and efficiency improves more than 10%.At present although also having coal gasification and coal Coking carry out alliance produce chemical products design, but due to alliance during, need oven gas or synthesis gas are carried out The transport of relatively long distance.Because both gas has stronger corrosivity, therefore in reality, there is no method to both gas Body carries out the transport of distance.Therefore there is larger limitation, be only applicable to Coal Gasification Project and coking of coal project apart from relatively Near case.However, the coal gasification of current China and coking of coal project, due to different from service object using coal, generally All distant, the scheme of inapplicable this alliance.
Content of the invention
In place of shortcoming and defect for solution prior art, the primary and foremost purpose of the present invention is to provide a kind of coal gasification and coal Coking alliance co-generation system.
Another object of the present invention is to providing a kind of coal gasification and coking of coal alliance co-production, the method is with coal gasification Turn to core with coal tar, overcome the undesirable defect of per unit area yield energy saving of system effect.
For achieving the above object, the present invention adopts the following technical scheme that
A kind of coal gasification and coking of coal alliance co-generation system, including coal gasification unit, water coal converter unit, purified synthesis gas Unit, the first chemical industry synthesis unit, co2Recovery unit, coking of coal unit, oven gas clean unit and the second chemical industry synthesis list Unit;
Described coal gasification unit is provided with feed coal entrance, the coal gasification crude synthesis gas outlet of coal gasification unit by pipeline with The coal gasification crude synthesis gas entrance of water coal converter unit connects, and after the conversion of water coal converter unit, the outlet of coal gasification crude synthesis gas is logical Piping is connected with coal gasification crude synthesis gas entrance after the conversion of purified synthesis gas unit, the coal of the cleaning of purified synthesis gas unit Gasification synthesis gas outlet is connected with the synthesis gas from coal gasification entrance of the cleaning of the first chemical industry synthesis unit by pipeline, and synthesis gas is net The carbon dioxide outlet changing unit passes through co2Conveyance conduit and co2The carbon dioxide entrance of recovery unit connects;
Described coking of coal unit is provided with feed coal entrance, and the coke export of coking of coal unit is divided into two passages, a passage By pipeline and co2The coke inlet of recovery unit is connected, and another passage is used for exporting coke product;Coking of coal unit thick Oven gas outlet is connected with the thick oven gas entrance of oven gas clean unit by pipeline, the cleaning of oven gas clean unit Oven gas outlet and co2By the coking of coal of pipeline and the second chemical industry synthesis unit after the carbon monoxide outlet mixing of recovery unit Synthesis gas entrance connects.
Described co2Conveyance conduit is supercritical co2Long distance pipeline, co2Transporting pattern is supercritical co2.
A kind of coal gasification and coking of coal alliance co-production, comprise the following steps:
Feed coal is divided into two parts, and a part of feed coal enters coal gasification unit after making water-coal-slurry and carries out coal gasification reaction Prepared coal gasification crude synthesis gas, it is thick that coal gasification crude synthesis gas adjust coal gasification after being converted after hydrogen-carbon ratio through water coal converter unit Synthesis gas;After conversion, coal gasification crude synthesis gas are passed through the carbon dioxide that purified synthesis gas unit removes sulfide and high concentration, obtain To clean synthesis gas from coal gasification and carbon dioxide, clean synthesis gas from coal gasification entrance the first chemical industry synthesis unit style is for chemical industry Product;Carbon dioxide is delivered to co2Recovery unit;
Another part feed coal entrance coking of coal unit carries out pyrogenetic reaction and obtains coke and thick oven gas;By a part of institute The coke obtaining is passed through co2Gasification reaction generates carbon monoxide altogether for recovery unit and carbon dioxide, and another part coke makes coke Product;It is miscellaneous that the thick oven gas of gained is passed through tar, benzene, naphthalene and sulfide that oven gas clean unit removes in thick oven gas etc. Matter, obtains the oven gas of cleaning;Carbon monoxide obtains coking of coal synthesis gas, coking of coal after being mixed in proportion with clean oven gas Synthesis gas enters the second chemical industry synthesis unit style for chemical products.
Preferably, the hydrogen-carbon ratio of described coal gasification crude synthesis gas is 0.5~1.
Preferably, the hydrogen-carbon ratio of described clean synthesis gas from coal gasification is 1~3.5.
Preferably, described coking of coal synthesis gas is being 2~6 through the hydrogen-carbon ratio after purifying.
Preferably, described first chemical industry synthesis unit and the second chemical industry synthesis unit are methanol, alkene, dimethyl ether, carbonic acid Dimethyl ester or the production process of synthetic natural gas.
Compared with prior art, the present invention has advantages below and a beneficial effect:
(1) turned to coal gas in the chemical process of core, can get concentration more than 95% in purified synthesis gas unit co2, this part co2Generally directly discharged or injected underground sequestration, greatly reduced coal utilizaton rate.At present, supercritical co2Long-distance transportation technology comparative maturity, and during having started to be applied to carbon trapping and sealing up for safekeeping.Therefore, the present invention The co being produced by gas recovery process2, transport to coking of coal process and produce the alliance mode of synthesis gas, can avoid joining at present For during, the higher problem of corrosive gas cost of transportation, and improve coal utilization efficiency.
The present invention passes through the co of gas recovery process2Complementary with oven gas element using it is achieved that to coal resources Effectively utilizes, it is to avoid coal gasification course co2Pollution caused by directly discharging, or the carbon waste caused by ccs process. According to the scale of coal gasification and coking of coal, the present invention can reduce the co of existing coal gasification course 20~95%2Discharge capacity.Meanwhile, During utilizing in oven gas, introduce co2Recovery unit, by a part of coke and co2Reaction produces co, with oven gas Its hydrogen-carbon ratio is effectively reduced, it is to avoid oven gas, after synthesis chemical products, is separated hydrogen and brought with product at present after mixing High energy consumption.
(2) turn to the alliance process of gas head at present with coal gasification and coal tar, there is synthesis gas or oven gas inconvenience length away from fortune Defeated problem, and in reality, the coal gasification plant of China is distant with coal tar chemical plant major part, double gas head alliances exist relatively Big limitation.Present invention, avoiding this pair of gas head matching process, using high concentration co of technology maturation2Distance defeated Send, realize the alliance coproduction of coal gasification and coking of coal, broken the limitation of original technology.
(3), as industrial coking of coal industrial waste gas, amount is big and pollutes environment for oven gas.The present invention is in addition sharp to this waste gas With reducing industrial coking of coal industrial gas emission, significantly improving resource and energy utilization rate.
(4) China's current coke production capacity is seriously superfluous, the coking of coal utilization of capacity only 50% about.The present invention passes through co2Reclaim Unit, STRENGTH ON COKE carries out high-value-use, produces chemical products, optimizes resource distribution.
Brief description
Fig. 1 is coal gasification of the present invention and coking of coal alliance co-generation system schematic diagram.Wherein 1 is coal gasification unit, and 2 is water coal Converter unit, 3 is purified synthesis gas unit, and 4 is the first chemical industry synthesis unit, and 5 is co2Recovery unit, 6 is coking of coal unit, 7 For oven gas clean unit, 8 is the second chemical industry synthesis unit;9~20 is logistics number, and wherein 9 is raw coal, and 10 is that coal gasification is thick Synthesis gas, 11 is coal gasification crude synthesis gas after conversion, and 12 is clean synthesis gas from coal gasification, and 13 is chemical products, and 14 is dioxy Change carbon, 15 is coke, 16 is thick oven gas, 17 is clean oven gas, 18 is carbon monoxide, 19 is coking of coal synthesis gas, 20 For chemical products.
Fig. 2 is embodiment 1 coal gasification and coking of coal alliance olefin process schematic diagram.Wherein 22 is olefin synthesis unit, 23 is methane steam reformation reactor, and 24 is the impurity such as tar, benzene, naphthalene and sulfide, and 25 is water-coal-slurry, and 26 is oxygen, 27 is methanol, and 28 is olefin product, and 29 is sulfide, and 30 is other materials such as tar, and 31 is carbon dioxide;32 is synthesis gas, 33 is methyl methanol syngas, and 34 is methanol, same reference numeral identical operating unit or logistics in remaining numbering and Fig. 1.
Fig. 3 is embodiment 2 coal gasification and coking of coal alliance combined production of methanol and natural gas process schematic diagram.Wherein 35 is synthesis Gas product, remaining numbering and same reference numeral identical operating unit or logistics in Fig. 2.
Specific embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention do not limit In this.
Coal gasification of the present invention and coking of coal alliance co-generation system are as shown in Figure 1: specifically include that coal gasification unit 1, water coal become Change unit 2, purified synthesis gas unit 3, the first chemical industry synthesis unit 4, co2Recovery unit 5, coking of coal unit 6, oven gas purify Unit 7 and the second chemical industry synthesis unit 8;
Described coal gasification unit 1 is provided with feed coal entrance, and pipeline is passed through in the coal gasification crude synthesis gas outlet of coal gasification unit 1 It is connected with the coal gasification crude synthesis gas entrance of water coal converter unit 2, after the conversion of water coal converter unit 2, coal gasification crude synthesis gas go out Mouthful be connected with coal gasification crude synthesis gas entrance after the conversion of purified synthesis gas unit 3 by pipeline, purified synthesis gas unit 3 clean Net synthesis gas from coal gasification outlet is connected with the synthesis gas from coal gasification entrance of the cleaning of the first chemical industry synthesis unit 4 by pipeline, The carbon dioxide outlet of purified synthesis gas unit 3 passes through co2Conveyance conduit and co2The carbon dioxide entrance of recovery unit 5 connects;
Described coking of coal unit 6 is provided with feed coal entrance, and the coke export of coking of coal unit 6 is divided into two passages, and one leads to Road passes through pipeline and co2The coke inlet of recovery unit 5 is connected, and another passage is used for exporting coke product;Coking of coal unit 6 The outlet of thick oven gas be connected with the thick oven gas entrance of oven gas clean unit 7 by pipeline, oven gas clean unit 7 Clean oven gas outlet and co2Pass through pipeline and the second chemical industry synthesis unit 8 after the carbon monoxide outlet mixing of recovery unit 5 Coking of coal synthesis gas entrance connect.
The method realizing alliance co-generation system of the present invention is as follows:
Feed coal 9 is divided into two parts, and a part of feed coal enters coal gasification unit 1 after making water-coal-slurry, and to carry out coal gasification anti- Coal gasification crude synthesis gas 10 should be obtained, coal gasification crude synthesis gas 10 are adjusted through water coal converter unit 2 after being converted after hydrogen-carbon ratio Coal gasification crude synthesis gas 11;After conversion, coal gasification crude synthesis gas 11 are passed through purified synthesis gas unit 3 removing sulfide and high concentration Carbon dioxide, obtain synthesis gas from coal gasification 12 and the carbon dioxide 14 of cleaning, clean synthesis gas from coal gasification 12 enters first Chemical industry synthesis unit 4 prepares chemical products 13;Carbon dioxide 14 is delivered to co2Recovery unit 5;
Another part feed coal entrance coking of coal unit 6 carries out pyrogenetic reaction and obtains coke 15 and thick oven gas 16;By one The coke 15 of part gained is passed through co2Gasification reaction generates carbon monoxide 18, another part altogether for recovery unit 5 and carbon dioxide 14 Coke makes coke product;The thick oven gas of gained 16 is passed through the tar that oven gas clean unit 7 removes in thick oven gas, benzene, naphthalene And the impurity such as sulfide, obtain the oven gas 17 of cleaning;Carbon monoxide 18 is obtained after being mixed in proportion with clean oven gas 17 To coking of coal synthesis gas 19, coking of coal synthesis gas 19 entrance the second chemical industry synthesis unit 8 preparation chemical products 20.
Coal gasification of the present invention and coking of coal alliance co-generation system can be not only used for the coal gasification plant closing on and coal tar chemical plant Transformation, also apply be applicable to distant Liang Zhong factory and realize alliance coproduction.
Embodiment 1
Olefin process is prepared using coal gasification of the present invention and coking of coal alliance co-generation system alliance, technical process such as Fig. 2 institute Show:
The water-coal-slurry 25 being made up of feed coal, the oxygen 26 obtaining with space division enters coal gasification unit 1 (gasification furnace) jointly, Oxidized reaction obtains coal gasification crude synthesis gas 10, and then coal gasification crude synthesis gas 10 adjust hydrogen-carbon ratio through water coal converter unit 2 Coal gasification crude synthesis gas 11 after being converted, after conversion, coal gasification crude synthesis gas 11 enter purified synthesis gas unit 3 (sour gas Removal unit) remove sulfide 29 and carbon dioxide 14, the synthesis gas from coal gasification 12 after being purified, the coal after the purification of gained Gasification synthesis gas 12 enter the first chemical industry synthesis unit 4 (methanol synthesis unit) synthesizing methanol 27, and methanol 27 enters alkene synthesis Unit 22 synthesizes olefin product 28;Carbon dioxide 14 enters co2Recovery unit 5 (coke for producing carbon dioxide stove), sulfide 29 Reclaimed;
For the raw material bituminous coal 9 of coking of coal, obtain coke 15, thick oven gas 16 in coking of coal unit 6 (coking furnace) coking With other materials 30 such as tar;Coke 15 part is made into coke product, and another part enters co2Recovery unit 5 (coke two Carbonoxide gasification furnace) react with carbon dioxide 14, produce carbon monoxide 18;Thick oven gas 16 enters oven gas clean unit 7 and takes off Except impurity 24 such as the tar in thick oven gas 16, benzene, naphthalene and sulfide, obtain the oven gas 17 of cleaning and send into the steaming of methane water Vapour reforming reactor 23, the methane in clean oven gas 17 is converted into synthesis gas 32, and (main component is co and h2) and dioxy Change carbon 31, carbon dioxide 31 enters co2Recovery unit 5 (coke for producing carbon dioxide stove), synthesis gas 32 and carbon monoxide 18 mix Conjunction obtains methyl methanol syngas 33 and enters the second chemical industry synthesis unit 8 (methanol synthesis unit) synthesizing methanol 34, and methanol 34 enters Olefin synthesis unit 22 synthesizes olefin product 28.
The coal gasification raw coal treating capacity entering system in the present embodiment is 100t/d, the crude synthesis gas being produced by gasification unit For 19.655 ten thousand m3, after the conversion of water coal and purifying, obtain synthesis gas 16.22 ten thousand m of cleaning3, concentration is 95% carbon dioxide 7.492 ten thousand m3, the synthesis gas synthesis 63t methanol of cleaning;Coking of coal raw coal treating capacity is 375t/d, produces 280t through coking Coke and 6.375 ten thousand m3Thick oven gas, thick oven gas is purified and methane steam reformation after, obtain 10.12 ten thousand m3Reformation Gas, 0.994 ten thousand m3Carbon dioxide enter coke for producing carbon dioxide unit (co2Recovery unit 5), synthesize 1.988 ten thousand m3One Carbonoxide, carbon monoxide enters methanol synthesis unit synthesize 47t methanol, the methanol of coking of coal and coal after mixing with reformation gas The methanol that vaporizing system obtains enters olefin synthesis unit together, obtains 58t ethylene and 52t propylene.
Current coal gasification per unit area yield olefin hydrocarbon, after water-coal-slurry made by raw coal, produces crude synthesis gas through gasification unit, it By the conversion of water coal and purification, obtain the synthesis gas of cleaning, after clean synthesis gas synthesizing methanol, then produced by methanol-fueled CLC alkene Product.Raw coal treating capacity is the coal gasification per unit area yield olefin hydrocarbon of 100t/d, can produce 60t/d olefin product, and produce about 6.65 Ten thousand m3Carbon dioxide.Compare coal gasification per unit area yield olefin hydrocarbon, the present embodiment alliance technique reducing emission of carbon dioxide about 15%, alkene Hydrocarbon yield expands about 74%.
Current preparing methanol from coke oven gas process, the thick oven gas being produced by coking of coal obtains the coke oven of cleaning after purifying Gas, clean oven gas enters methanol synthesis unit synthesizing methanol, enters methanol purification unit afterwards and separates unreacted hydrogen And carrying out methanol rectification, unreacted hydrogen enters flare system burning.Compare preparing methanol from coke oven gas process, alliance mistake of the present invention Journey is passed through to increase co2Recovery unit, the coke product of part of coal coking is converted to co, reduces the hydrogen-carbon ratio of oven gas, Avoid Hydrogen Separation and the waste bringing of burning during preparing methanol from coke oven gas.
Embodiment 2
Using coal gasification of the present invention and coking of coal alliance co-generation system alliance combined production of methanol and natural gas process, technical process As shown in Figure 3:
The water-coal-slurry 25 being made up of feed coal, the oxygen 26 obtaining with space division enters coal gasification unit 1 (gasification furnace) jointly, Oxidized reaction obtains coal gasification crude synthesis gas 10, and then coal gasification crude synthesis gas 10 adjust hydrogen-carbon ratio through water coal converter unit 2 Coal gasification crude synthesis gas 11 after being converted, after conversion, coal gasification crude synthesis gas 11 enter purified synthesis gas unit 3 (sour gas Removal unit) sulfide 29 in removing coal gasification crude synthesis gas 11 and carbon dioxide 14, the coal gas after being purified is combined to Gas 12, the synthesis gas from coal gasification 12 after the purification of gained enters the first chemical industry synthesis unit 4 (methanol synthesis unit) synthesizing methanol 27;The co through pipeline to coking of coal process for the carbon dioxide 142Recovery unit 5 (coke for producing carbon dioxide stove), sulfide 29 are reclaimed;
Feed coal 9 (coking raw material coal) obtains coke 15, thick oven gas 16 and Jiao in coking of coal unit 6 (coking furnace) coking Other materials 30 such as oil;Coke 15 part is made into coke product, and another part enters co2Recovery unit 5 (coke titanium dioxide Carbon gasification stove) react with carbon dioxide 14, produce carbon monoxide 18;Thick oven gas 16 enters oven gas clean unit 7 and removes slightly The impurity such as the tar in oven gas 16, benzene, naphthalene and sulfide 52, obtain the oven gas 17 of cleaning, oven gas 17 He of cleaning Carbon monoxide 18 is mixed to get coking of coal synthesis gas 19, and coking of coal synthesis gas 19 enters the second chemical industry synthesis unit 8, and (methane synthesizes Reactor) reaction obtain synthetic natural gas product 35.
The coal gasification raw coal treating capacity entering system in the present embodiment is 150t/d, the crude synthesis gas being produced by gasification unit For 29.48 ten thousand m3, after the conversion of water coal and purifying, obtain synthesis gas 24.15 ten thousand m of cleaning3, concentration is 95% carbon dioxide 11.24 ten thousand m3, the synthesis gas synthesis 92t methanol of cleaning;Coking of coal raw coal treating capacity is 1000t/d, produces through coking 720t coke and 17.65 ten thousand m3Oven gas, 1.21 ten thousand m3Carbon dioxide enter coke for producing carbon dioxide unit (co2Reclaim single Unit 5), synthesize 2.36 ten thousand m3Carbon monoxide, carbon monoxide mix with reformation gas after enter methanation reaction unit, generate 3.5 Ten thousand m3Synthetic natural gas.
Current coal gasification per unit area yield methanol process, after water-coal-slurry made by raw coal, produces crude synthesis gas through gasification unit, afterwards Through the conversion of water coal and purification, obtain the synthesis gas of cleaning, the synthesis gas through methanol synthesis unit synthetic coarse methanol of cleaning, crude carbinol Obtain methanol product through rectification and purification.Raw coal treating capacity is the coal gasification per unit area yield olefin hydrocarbon of 100t/d, produces about 6.65 ten thousand m3The carbon dioxide of/d.Contrast current coal gasification methanol process, the present embodiment alliance technique reducing emission of carbon dioxide is about 10.8%.
Current making synthetic natural gas by using coke-oven gas process, the thick oven gas being produced by coking of coal obtains cleaning after purifying Oven gas, clean oven gas enters methanator synthetic natural gas, because the hydrogen-carbon ratio needed for methanation reaction is 3 Left and right, and the hydrogen-carbon ratio of oven gas reaches more than 6, therefore substantial amounts of hydrogen fails to react, due to synthetic natural gas and hydrogen Boiling point is relatively low, and hydrogen content very high it is therefore desirable to by pressure-variable adsorption or cryogenic separation process separate unreacted hydrogen and Product natural gas, this process energy consumption is very high.Alliance process in the present embodiment, is produced by the coke of just part of coal coking Product are converted to co, reduce the hydrogen-carbon ratio of oven gas, it is to avoid oven gas system becomes Hydrogen Separation process during natural gas very much Energy consumption, the efficiency of whole alliance process can improve more than 8%.
The coke of production capacity surplus and waste gas oven gas are carried out higher value application by the present embodiment alliance technique, produce every year 2.8 hundred million m3Synthetic natural gas, the breach of current Natural Gas Demand can be made up to a certain extent.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not subject to above-described embodiment Limit, other any spirit without departing from the present invention and the change made under principle, modification, replacement, combine, simplify, All should be equivalent substitute mode, be included within protection scope of the present invention.

Claims (6)

1. a kind of coal gasification and coking of coal alliance co-generation system are it is characterised in that described alliance co-generation system includes coal gasification list Unit, water coal converter unit, purified synthesis gas unit, the first chemical industry synthesis unit, co2Recovery unit, coking of coal unit, oven gas Clean unit and the second chemical industry synthesis unit;
Described coal gasification unit is provided with feed coal entrance, and the coal gasification crude synthesis gas outlet of coal gasification unit is by pipeline and water coal The coal gasification crude synthesis gas entrance of converter unit connects, and after the conversion of water coal converter unit, the outlet of coal gasification crude synthesis gas is by pipe Road is connected with coal gasification crude synthesis gas entrance after the conversion of purified synthesis gas unit, the coal gasification of the cleaning of purified synthesis gas unit Syngas outlet is connected with the synthesis gas from coal gasification entrance of the cleaning of the first chemical industry synthesis unit by pipeline, purified synthesis gas list The carbon dioxide outlet of unit passes through co2Conveyance conduit and co2The carbon dioxide entrance of recovery unit connects;
Described coking of coal unit is provided with feed coal entrance, and the coke export of coking of coal unit is divided into two passages, and a passage passes through Pipeline and co2The coke inlet of recovery unit is connected, and another passage is used for exporting coke product;The thick coke oven of coking of coal unit Gas outlet is connected with the thick oven gas entrance of oven gas clean unit by pipeline, the coke oven of the cleaning of oven gas clean unit Gas outlet and co2It is combined to by the coal tar of pipeline and the second chemical industry synthesis unit after the carbon monoxide outlet mixing of recovery unit Gas entrance connects.
2. alliance co-generation system according to claim 1 is it is characterised in that described first chemical industry synthesis unit and second is changed Work synthesis unit is methanol, alkene, the production process of dimethyl ether, dimethyl carbonate or synthetic natural gas.
3. alliance co-generation system according to claim 1 is it is characterised in that described co2Conveyance conduit is supercritical co2Long Defeated pipeline, co2Transporting pattern is supercritical co2.
4. the coal gasification of alliance co-generation system described in a kind of utilization claim 1 and coking of coal alliance co-production, its feature It is, described alliance co-production comprises the following steps:
Feed coal is divided into two parts, a part of feed coal make water-coal-slurry after enter coal gasification unit carry out coal gasification reaction be obtained Coal gasification crude synthesis gas, coal gasification crude synthesis gas adjust through water coal converter unit and are passed through the removing of purified synthesis gas unit after hydrogen-carbon ratio Sulfide and carbon dioxide, obtain synthesis gas from coal gasification and the carbon dioxide of cleaning, and clean synthesis gas from coal gasification enters first Chemical industry synthesis unit style is for chemical products;Carbon dioxide is delivered to co2Recovery unit;
Another part feed coal entrance coking of coal unit carries out pyrogenetic reaction and obtains coke and thick oven gas;A part of gained is burnt Charcoal is passed through co2Gasification reaction generates carbon monoxide altogether for recovery unit and carbon dioxide;The thick oven gas of gained is passed through oven gas and purifies Unit imurity-removal, obtains the oven gas of cleaning;Carbon monoxide obtains coal tar chemical combination after being mixed in proportion with clean oven gas Become gas, coking of coal synthesis gas enters the second chemical industry synthesis unit style for chemical products.
5. alliance co-production according to claim 4 is it is characterised in that the hydrogen-carbon ratio of described coal gasification crude synthesis gas is 0.5~1.
6. alliance co-production according to claim 4 is it is characterised in that the hydrogen carbon of described clean synthesis gas from coal gasification Than for 1~3.5.
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