Poly-generation high-efficiency thermal decomposition-gasification the train of a kind of coal and pyrolysis gasification methodTechnical field
The invention belongs to coal pyrolytic gasified technical field, be specifically related to the Poly-generation high-efficiency thermal decomposition-gasification series connection of a kind of coalSystem and pyrolysis gasification method.
Background technology
Coal is the basic guarantee that China's economic is lasting, fast-developing.The energy of China's " rich coal, oil starvation, few gas " is composed and is depositedConditional decision is within the following long duration, and the coal principal status of public economy in energy resource structure will not change.But in recent years along withThe downslide of economic situation, country carries out the reform of superfluous industry supply side, and what iron and steel coal industry was faced with that reduction production capacity brings sends outExhibition pressure, transition and upgrade becomes the important motivity of Enterprise's Sustainable Development.In the face of superfluous coal production, account for coal in China and verify storageLow-quality coal and the single " three high " poor quality coking coal resource of a large amount of purposes of amount 55.1% need to seek new process approach.CauseThis, coal chemical enterprise utilizes superfluous production capacity to process low-quality coal or " three high " poor quality coking coal, is used for producing gasification Jiao, and with gasChange combines, and produces LNG or chemicals, had both achieved the sustainable development of enterprise, and achieved again transition and upgrade.
Comprehensively utilize for realizing the sub-prime classification clean and effective of coal, developed multiple comprehensive coal chemical technology.The most existingThe coal chemical technology patent of pyrolysis-gasification series connection, also has corresponding engineering mimoir to apply, but all with fluid bed or air flow bedForm realizes pyrolysis and gasification, although achieve higher efficiency of carbon con version, but there is also that tar dustiness is big, efficiency of utilizationLow, device fabrication difficulty is big, industry is amplified and be there is the problems such as technical barrier.And for the pyrolysis-gasification of coke oven series connection gasification furnaceSystem and gasification and pyrolysis method, be not yet found to have Patents.
CN102191088A discloses a kind of solid fuel double fluidized bed thermal pyrolysis grade transformation device and method.This dressPut and be in series by fluidized bed pyrolysis stove and fluidized-bed gasification furnace, solid fuel first carry out in fluidized bed pyrolysis stove in Low Temperature ThermalSolving, the semicoke of generation is delivered to fluidized-bed gasification furnace gasification and is generated synthesis gas, and the high temperature ash that gasification furnace produces simultaneously is as solid thermalCarrier loop is delivered to pyrolysis oven, provides pyrolysis institute calorific requirement for solid fuel.This kind of method has recycled the height of gasification furnaceTemperature ash, improves efficiency of utilization, but recycle stock circulating load is relatively big, reduces the disposal ability of system, simultaneously because useFluidized bed pyrolysis mode, the tar of collection contains substantial amounts of dust, and separating difficulty is bigger.
CN105062526A discloses a kind of coal pyrolytic gasified polygenerations systeme and pyrolysis gasification method thereof.This invention is profitWith pressure conveyer device, fine coal is conveyed into the pyrolysis installation of coal, from the high-temperature synthesis gas of gasification furnace in pyrolysis of coal device withFine coal directly contacts, and is sufficiently mixed heat exchange, completes the pyrolysis of fine coal.Pyrogenous origin semicoke, coal gas and entrance pyrolysis installationSynthesis gas separates in gas-solid separating device with the form of mixed airflow, and high-temperature semi-coke is delivered to gasification furnace gasification, and gas is sent toCryogenic separation device.The method utilizes temperature gasification and high synthesis gas as pyrolysis thermal source, make use of the high temperature of gasification gas to greatest extentWaste heat, but a large amount of synthesis gas mixes with pyrolysis raw coke oven gas, adds the load of follow-up cryogenic system, dilutes high heating value pyrolyzing coalGas.The mode using air flow bed processes fine coal and causes reclaiming dustiness increasing in tar, and is difficult to separate.
Above method has carried out a lot of innovations and improvement, but still Shortcomings on pyrolysis-gasification technology.Therefore,Need Poly-generation high-efficiency thermal decomposition-gasification train and the pyrolysis gasification method of a kind of coal, solve the pyrolysis caused because of air-flowThe problem that tar dust content is big, it is ensured that pyrolysis coal gas gentleization coal gas is separate, at utmost realizes inside process systemTechnology couples, and improves system whole efficiency, can process low-grade coal and " three high " coking coal.
Summary of the invention
The purpose of the present invention is to provide the Poly-generation high-efficiency thermal decomposition-gasification train of a kind of coal and pyrolysis gasification method,This system and method is advanced, efficient, environmental protection, can process low-order coal, it is also possible to process three-hypers coking coal, solve prior artIn the big problem of pyrolytic tar dustiness, it is ensured that pyrolysis coal gas gentleization coal gas is separate, at utmost realizes technique systemSystem internal technology coupling, improves system whole efficiency, can process low-grade coal and " three high " coking coal simultaneously.
The technical scheme that the present invention uses for achieving the above object is: the Poly-generation high-efficiency thermal decomposition of a kind of coal-gasification series connectionSystem, including the coal-blending device being sequentially connected with, coke oven, coke transporter, coke lifting device, lump coal gasification reactor,Waste heat boiler, gasification gas purifier gentle body weight engagement positions；Described coke oven also with the entrance of pyrolyzing coal air purifying apparatusEnd is connected, and the port of export of pyrolyzing coal air purifying apparatus is connected with gas reforming device；Gasification gas purifier also with returnProducer gas cabinet is connected；Coke oven with lump coal gasification reactor respectively by the acquisition oxygen that is connected with air separation unit.
As the further optimization of the Poly-generation high-efficiency thermal decomposition-gasification train of a kind of coal of the present invention, described coke ovenFor vertical tamping coke oven or top dress coke oven.
As the further optimization of the Poly-generation high-efficiency thermal decomposition-gasification train of a kind of coal of the present invention, described coke carriesRising device with lump coal gasification reactor by beam-to-column connection, steel frame top is provided with the translation track of coke lifting device canCoke lifting device is made to move to above lump coal gasification reactor.
As the further optimization of the Poly-generation high-efficiency thermal decomposition-gasification train of a kind of coal of the present invention, described lump coal gasChange reactor head and be disposed with high-temperature coal locking device and charging apparatus from down to up.
The pyrolysis gasification method of the Poly-generation high-efficiency thermal decomposition-gasification system of described coal, first chooses coal and passes through coal-blending deviceCompleting coal blending, the coal after cooperation enters coke oven and is pyrolyzed, and the coke generated after pyrolysis is pushed into coke transporter, passes throughCoke is sent into lump coal gasification reactor by coke lifting device, and the high-temperature gasification coal gas generated after gasification reaction passes through waste heat boilerCarrying out waste heat recovery, gasification gas after waste heat recovery enters gasification gas purifier, Partial cleansing after gasification of coal pneumatic transmissionToward firing tunnel in coking furnace cabinet, the gasification gas after remainder purifies enters gas reforming device, and from pyrolysis gas purifierPyrolysis coal gas, stack gases and external hydrogen make-up from coke oven are reformed；Wherein, described purify from pyrolysis gasThe pyrolysis coal gas of device is that the raw coke oven gas produced after mixed coal is pyrolyzed in coke oven carries out tar through pyrolysis gas purifierPyrolysis coal gas after purifying with chemical recovery；It is interior as coke oven that gasification gas in described firing tunnel in coking furnace cabinet is passed through coke ovenFor heating gas；Air separation unit provides pure oxygen or oxygen-enriched for coke oven and lump coal gasification reactor；The part cigarette that coke oven producesRoad waste gas is for the gasifying agent of lump coal gasification reactor, and delivers in gasification furnace with secondary water steam.
The further of pyrolysis gasification method as the Poly-generation high-efficiency thermal decomposition-gasification system of a kind of coal of the present invention optimizes,Gasification gas after Partial cleansing and the pyrolysis coal gas from pyrolysis gas purifier, the stack gases from coke oven and outerCarrying out hydrogen make-up can be by unstripped gas that gas reforming is synthesis gas or methanation LNG.
The further of pyrolysis gasification method as the Poly-generation high-efficiency thermal decomposition-gasification system of a kind of coal of the present invention optimizes,The described pyrolysis coal gas from pyrolysis gas purifier can also be directly used in extraction methane or hydrogen.
The further of pyrolysis gasification method as the Poly-generation high-efficiency thermal decomposition-gasification system of a kind of coal of the present invention optimizes,The coke released from described coke oven is sent directly into lump coal gasification reactor without quenching.
The further of pyrolysis gasification method as the Poly-generation high-efficiency thermal decomposition-gasification system of a kind of coal of the present invention optimizes,The gasification gas that described lump coal gasification reactor produces also can be as the confession hot gas source of coke oven.
The further of pyrolysis gasification method as the Poly-generation high-efficiency thermal decomposition-gasification system of a kind of coal of the present invention optimizes,The oxygen that described air separation unit produces, using pure oxygen or with carbon dioxide be in harmonious proportion oxygen-enriched as coke oven for the combustion-supporting gas of steam.
Compared with prior art, the present invention at least has and has the advantage that and beneficial effect:
1. the present invention uses coke oven to utilize low-grade coal and " three high " coking coal to produce gasification Jiao, can obtain high-quality burnt simultaneouslyOil, pyrolysis coal gas gentleization coal gas, it is achieved the Poly-generation comprehensive utilization of colm；
2. the coke that coke oven pyrolysis produces is transported by coke and lifting device, is sent directly into gasification furnace without quenching, fullyMake use of coke sensible heat, eliminate coke quenching auxiliary, also reduce gasification furnace oxygen consumption simultaneously；
3. utilize the gasification gas that gasification furnace produces to replace melting down pyrolysis coal gas as coke oven heating source of the gas, displace high methaneThe pyrolysis coal gas of content and hydrogen content, it is achieved that the most worthy of resource utilizes；
4. use pure oxygen or the oxygen-enriched combustion-supporting gas instead of air as coke oven heating gas being in harmonious proportion with carbon dioxide, giving up after burningGas can be with the gasifying agent of Substitute For Partial gasification furnace, it is also possible to as reformer gas carbon source, it is achieved that the comprehensive utilization of stack gases,Reduce disposal of pollutants；
5. in the pyrogenous origin raw coke oven gas of the coke oven of fixed-bed pyrolysis form, dustiness is less, it is ensured that quality of coke tar, generates simultaneouslyPyrolysis coal gas be used directly for extracting methane or hydrogen, it is also possible to gasification gas, stack gases and external hydrogen make-upCarry out reforming for producing LNG or synthesis chemical products, there is product selection scheme more flexibly.
Accompanying drawing explanation
Fig. 1 is the system diagram of the Poly-generation high-efficiency thermal decomposition-gasification train of the coal of the present invention:
Reference: 1, coal-blending device, 2, coke oven, 3, coke transporter, 4, coke lifting device, 5, lump coal gasification reactionDevice, 6, waste heat boiler, 7, gasification gas purifier, 8, gas reforming device, 9, pyrolyzing coal air purifying apparatus, 10, melt down coalGas holder, 11, air separation unit.
Detailed description of the invention
For making present disclosure become apparent, below in conjunction with specific embodiment, describe the present invention.
A kind of Poly-generation high-efficiency thermal decomposition-gasification train of coal, including the coal-blending device 1 being sequentially connected with, coke oven 2,Coke transporter 3, coke lifting device 4, lump coal gasification reactor 5, waste heat boiler 6, gasification gas purifier 7 and gasReformer 8；Described coke oven 2 also arrival end with pyrolyzing coal air purifying apparatus 9 is connected, pyrolyzing coal air purifying apparatus 9The port of export is connected with gas reforming device 8；Gasification gas purifier 7 is also connected with firing tunnel in coking furnace cabinet 10；Coke oven 2 HeLump coal gasification reactor 5 is respectively by the acquisition oxygen that is connected with air separation unit 11.
In order to make the present invention have more preferable implementation result, described coke oven 2 is vertical tamping coke oven or top dress cokingStove.Described coke lifting device 4 and lump coal gasification reactor 5 are by beam-to-column connection, and steel frame top is provided with coke and promotesThe translation track of device 4 can make coke lifting device 4 move to above lump coal gasification reactor 5.Described lump coal gasification reactor 5Top is disposed with high-temperature coal locking device and charging apparatus from down to up.
The pyrolysis gasification method of the Poly-generation high-efficiency thermal decomposition-gasification system of described coal, first chooses middle high ash low-sulfur 1/3 coking coalGrey 1/3 coking coal low with high-sulfur, as Coal Blending, is crushed to suitable particle size, completes coal blending by coal-blending device 1, the coal after cooperationEntering coke oven 2 by the way of making firm by ramming or pushing up dress to be pyrolyzed, the coke generated after pyrolysis is pushed into coke transporter 3,By coke lifting device 4, coke is sent into lump coal gasification reactor 5 to gasify, make full use of coke sensible heat, reduce gasificationOxygen consumes.
The high-temperature gasification coal gas generated after gasification reaction carries out waste heat recovery by waste heat boiler 6, makes full use of more than techniqueHeat, gasification gas after waste heat recovery enters gasification gas purifier 7, Partial cleansing after gasification gas be sent to firing tunnel in coking furnaceCabinet 10, the gasification gas after remainder purifies enters gas reforming device 8, with the pyrolyzing coal from pyrolysis gas purifier 9Gas, stack gases and external hydrogen make-up from coke oven 2 are reformed.Different according to product demand, Partial cleansing afterGasification gas and the pyrolysis coal gas from pyrolysis gas purifier 9, the stack gases from coke oven 2 and external hydrogen make-upCan be by unstripped gas that gas reforming is synthesis gas or methanation LNG, it is achieved that intrasystem technology couples, and makes full use of carbonResource, reduces waste gas discharge.Pyrolysis coal gas from pyrolysis gas purifier 9 can also be directly used in extraction methane or hydrogen.The described pyrolysis coal gas from pyrolysis gas purifier 9 is that the raw coke oven gas produced after mixed coal is pyrolyzed in coke oven 2 passes throughPyrolysis gas purifier 9 carries out the pyrolysis coal gas after tar and chemical recovery purification.
Gasification gas in described firing tunnel in coking furnace cabinet 10 is passed through the interior confession heating gas as coke oven 2 of coke oven 2；Space division fillsPut 11 and provide pure oxygen or oxygen-enriched for coke oven 2 and lump coal gasification reactor 5；The part stack gases that coke oven 2 produces is for blockThe gasifying agent of coal gasification reactor 5, and deliver in gasification furnace with secondary water steam, improve system whole efficiency.
The coke released from described coke oven 2 is sent directly into lump coal gasification reactor 5 without quenching, takes full advantage ofCoke sensible heat, eliminates coke quenching auxiliary, also reduces gasification furnace oxygen consumption simultaneously.The gasification that described lump coal gasification reactor 5 producesCoal gas also can be as the confession hot gas source of coke oven 2.
The oxygen that described air separation unit 11 produces, using pure oxygen or oxygen-enriched as coke oven 2 heat supply with what carbon dioxide was in harmonious proportionThe combustion-supporting gas of gas.
Technical scheme employed in above example is a preferred embodiment of the present invention, is not intended to limit thisBright protection domain.