CN105670700A - System and method for treating low-rank coal - Google Patents
System and method for treating low-rank coal Download PDFInfo
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- CN105670700A CN105670700A CN201610168596.5A CN201610168596A CN105670700A CN 105670700 A CN105670700 A CN 105670700A CN 201610168596 A CN201610168596 A CN 201610168596A CN 105670700 A CN105670700 A CN 105670700A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
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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
- 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
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/50—Fuel charging devices
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0903—Feed preparation
- C10J2300/0906—Physical processes, e.g. shredding, comminuting, chopping, sorting
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0903—Feed preparation
- C10J2300/0909—Drying
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0973—Water
- C10J2300/0976—Water as steam
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a system and method for treating low-rank coal. The system comprises: a hot blast combined gangue discharging device, a screening device, a pyrolysis device, a semi-coke waste heat recycling device, a pulverized coal drying device and a pulverized coal gasifying device; a cleaned coal inlet of the screening device is in connection with a cleaned coal outlet of the hot blast combined gangue discharging device; a pump coal inlet of the pyrolysis device is in connection with a lump coal outlet of the screening device; a semi-coke outlet of the semi-coke waste heat recycling device is in connection with a semi-coke outlet of the pyrolysis device, and a hot gas outlet of the semi-coke waste heat recycling device is in connection with a hot gas inlet of the hot blast combined gangue discharging device; a pulverized coal inlet of the pulverized coal drying device is in connection with a pulverized coal outlet of the screening device; a dried pulverized coal inlet of the pulverized coal gasifying device is in connection with a dried pulverized coal outlet of the pulverized coal drying device. With the system, it is possible to solve the problem that gangue discharging rate is low for low-rank coal in existing combined gangue discharging technology, semi-coke waste heat produced in pyrolysis is recycled for discharging gangue, energy cost is reduced, and pulverized coal is gasified in the meantime so that utilization rate of raw material is increased.
Description
Technical field
The invention belongs to technical field of coal chemical industry, specifically, the present invention relates to a kind of system and method processing low-order coal.
Background technology
Low-order coal mainly includes non caking coal, weakly caking coal, jet coal and brown coal etc., has moisture height, density is little, volatile matter is high, do not cohere, chemical reactivity strong, poor heat stability and the feature such as caloric value is low. China's low-order coal resource proved reserves are also at 200,000,000,000 more than t, and the reserves of low-order coal account for verifies more than the 55% of coal reserves.
The thermal efficiency that low-order coal is directly burnt is low, and the discharge capacity of greenhouse gases is also very big, it is difficult to large-scale develop and utilize. Low-order coal is processed without upgrading, it is difficult to meet the prescription of multiple user, and therefore the key that low-order coal Efficient Development utilizes is processed in upgrading. The upgrading processing of low-order coal includes sorting, dry, molding, pyrolysis, gasification etc., after low-order coal deliming, dehydration, calorific value increases, can reducing the corrosion of equipment in following process process after low-order coal desulfurization and reduce the acid rain harm to environment, low-order coal can expand it by upgrading processing and utilize scope.
Although by sorting the dirt that can remove in low-order coal, but coal and water are fully contacted in wet split process, coal selecting product moisture is caused to increase, reduce product caloric value, partial offset coal washing effect, also contradicting with the target of upgrading dehydration, and in the dry separation process of room temperature, the surface moisture of coal makes the sticking probability between granule big, separating effect is poor. Compared with low-order coal combustion power generation, low-order coal is made directly dry, pyrolysis and gasification technology improves the utilization ratio of low-order coal to a certain extent, but the dirts such as ash in upgraded coal, sulfur affect the quality of following process product, and the compound such as sulfur-bearing, nitrogen pollutes environment and equipment corrosion, reduce effective treating capacity of pyrolysis and gasification simultaneously. Therefore, develop new low-order coal utilization ways and become the research direction that low-order coal deep processing is new.
Summary of the invention
It is contemplated that one of technical problem solved at least to a certain extent in correlation technique. For this, it is an object of the present invention to propose a kind of system and method processing low-order coal, this system can solve the problem that existing combined type discharge refuse technology is low to low-order coal rate of discharging refuse, such that it is able to improve quality and the productivity of pyrolysis product in subsequent thermal solution preocess, and by the waste heat recovery produced in pyrolytic process is used for discharge refuse process, energy cost can be significantly reduced, simultaneously by fine coal is carried out gasification process obtain gasification gas, it is possible not only to significantly improve raw material availability, and Business Economic Benefit can be improved.
In one aspect of the invention, the present invention proposes a kind of system processing low-order coal. According to embodiments of the invention, this system includes:
Hot blast combined type waste rock discharge device, described hot blast combined type waste rock discharge device has low-order coal entrance, hot-wind inlet, spoil outlet, cleaned coal outlet and offgas outlet;
Screening plant, described screening plant has cleaned coal entrance, lump coal outlet and fine coal outlet, and described cleaned coal entrance is connected with the outlet of described cleaned coal;
Pyrolysis installation, described pyrolysis installation has lump coal entrance, semicoke outlet and pyrolysis oil gas vent, and described lump coal entrance is connected with the outlet of described lump coal;
Semicoke waste-heat recovery device, described semicoke waste-heat recovery device has semicoke entrance, cooling semicoke outlet and heat outlet, and described semicoke entrance is connected with the outlet of described semicoke, and described heat outlet is connected with described hot-wind inlet;
Fine coal drying device, described fine coal drying device has fine coal entrance, dry hot gas inlet, xeraphium coal export and dry offgas outlet, and described fine coal entrance is connected with the outlet of described fine coal; And
Gasifying powder coal device, described gasifying powder coal device has the gentle activating QI outlet of dry fine coal entrance, and described dry fine coal entrance is connected with described xeraphium coal export.
Thus, low-order coal is processed by the system of process low-order coal according to embodiments of the present invention by adopting hot blast, not only achieve predrying and discharge refuse integration, and the moisture on low-order coal surface can be removed by pre-dried, thus reducing in discharge refuse process between granule the bonding probability (especially between cleaned coal and spoil), solve the problem that existing combined type discharge refuse technology is low to low-order coal rate of discharging refuse, and solve the inferior problem of the gentle activating QI of pyrolysis product poor quality, namely the system adopting the present invention can significantly improve the quality of gasification product in the quality of pyrolysis product in pyrolytic process and gasification, simultaneously by being dried process before low-order coal is carried out gasification process, gas yield and quality in gasification can be significantly improved, secondly by by combined type discharge refuse technology, dry technology, pyrolytic technique and gasification technology organic integration, cleverly the waste heat produced in pyrolytic process is used for discharge refuse process, processing procedure energy cost can be significantly reduced.
It addition, the system of process low-order coal according to the above embodiment of the present invention can also have following additional technical characteristic:
In some embodiments of the invention, the system of described process low-order coal farther includes: dust arrester, described dust arrester has gas inlet, gas outlet and dust outlet, and described gas inlet is connected with described offgas outlet and described dry offgas outlet respectively.
In some embodiments of the invention, the system of described process low-order coal farther includes: waste heat boiler, described waste heat boiler has gasification gas entrance, gas exit and superheated steam outlet, described gasification gas entrance is connected with the outlet of described gasification gas, and the outlet of described superheated steam is connected with described dry hot gas inlet.Thus, it is possible to realize making full use of of system waste heat, thus reduce energy cost.
In another aspect of the invention, the present invention proposes a kind of method processing low-order coal. According to embodiments of the invention, the method is that the system adopting process low-order coal described above carries out. According to a particular embodiment of the invention, the method includes:
(1) low-order coal supply to described hot blast combined type waste rock discharge device will adopt hot blast that described low-order coal carries out discharge refuse and pre-dried, in order to respectively obtain spoil, cleaned coal and the tail gas containing dust;
(2) supply of described cleaned coal is carried out screening process to described screening plant, in order to obtain lump coal and fine coal;
(3) supply of described lump coal is carried out pyrolysis processing to described pyrolysis installation, in order to obtain semicoke and pyrolysis oil gas;
(4) supply of described semicoke is carried out waste heat recovery processing to described semicoke waste-heat recovery device, in order to obtain cooling semicoke and steam, and used as described hot blast by described steam return step (1);
(5) described fine coal supply to described fine coal drying device will adopt dry steam described fine coal is dried process, in order to obtain dry tail gas and dry fine coal; And
(6) supply of described dry fine coal is carried out gasification process to described gasifying powder coal device, in order to obtain gasification gas.
Thus, low-order coal is processed by the system of process low-order coal according to embodiments of the present invention by adopting hot blast, not only achieve predrying and discharge refuse integration, and the moisture on low-order coal surface can be removed by pre-dried, thus reducing in discharge refuse process between granule the bonding probability (especially between cleaned coal and spoil), solve the problem that existing combined type discharge refuse technology is low to low-order coal rate of discharging refuse, and solve the inferior problem of the gentle activating QI of pyrolysis product poor quality, namely the system adopting the present invention can significantly improve the quality of gasification product in the quality of pyrolysis product in pyrolytic process and gasification, simultaneously by being dried process before low-order coal is carried out gasification process, gas yield and quality in gasification can be significantly improved, secondly by by combined type discharge refuse technology, dry technology, pyrolytic technique and gasification technology organic integration, cleverly the waste heat produced in pyrolytic process is used for discharge refuse process, processing procedure energy cost can be significantly reduced.
It addition, the method for process low-order coal according to the above embodiment of the present invention can also have following additional technical characteristic:
In some embodiments of the invention, the method for described process low-order coal farther includes: the described tail gas containing dust and described dry tail gas are supplied and carries out dust removal process to described dust arrester by (7), in order to collect dust.
In some embodiments of the invention, the method of described process low-order coal farther includes: the supply of described gasification gas is carried out waste heat recovery processing by (8) to described waste heat boiler, to obtain coal gas and superheated steam, and described superheated steam is back to step (5) uses as described dry steam. Thus, it is possible to realize making full use of of system waste heat, thus reduce energy cost.
In some embodiments of the invention, in step (1), the temperature of described hot blast is 80～130 degrees Celsius, and the flow velocity of described hot blast is 8～23m/s. Dry and discharge refuse efficiency thus, it is possible to significantly improve low-order coal.
In some embodiments of the invention, in step (2), the particle diameter of described lump coal is not less than 6mm.Thus, it is possible to significantly improve low-order coal pyrolysis efficiency.
In some embodiments of the invention, in step (3), the temperature of described pyrolysis processing is 500-900 degree Celsius.
In some embodiments of the invention, in step (5), the temperature of described dry steam is 100～200 degrees Celsius, and the flow velocity of described dry steam is 0.1～0.5m/s. Thus, it is possible to significantly improve the drying efficiency of fine coal.
In some embodiments of the invention, in step (6), the temperature of described gasification 800～1100 degrees Celsius. Thus, it is possible to significantly improve the gasification efficiency of fine coal, thus improving gasification gas productivity.
The additional aspect of the present invention and advantage will part provide in the following description, and part will become apparent from the description below, or is recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from conjunction with will be apparent from easy to understand the accompanying drawings below description to embodiment, wherein:
Fig. 1 is the system structure schematic diagram processing low-order coal according to an embodiment of the invention;
Fig. 2 is the system structure schematic diagram of the process low-order coal according to further embodiment of the present invention;
Fig. 3 is the system structure schematic diagram of the process low-order coal according to another embodiment of the present invention;
Fig. 4 is the method flow schematic diagram processing low-order coal according to an embodiment of the invention;
Fig. 5 is the method flow schematic diagram of the process low-order coal according to further embodiment of the present invention;
Fig. 6 is the method flow schematic diagram of the process low-order coal according to another embodiment of the present invention;
Fig. 7 is the system structure schematic diagram of the process low-order coal according to another embodiment of the present invention.
Detailed description of the invention
Being described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish. The embodiment described below with reference to accompanying drawing is illustrative of, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", " counterclockwise ", " axially ", " radially ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not considered as limiting the invention.
Additionally, term " first ", " second " are only for descriptive purposes, and it is not intended that indicate or imply relative importance or the implicit quantity indicating indicated technical characteristic. Thus, define " first ", the feature of " second " can express or implicitly include at least one this feature. In describing the invention, " multiple " are meant that at least two, for instance two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or integral;Can be mechanically connected, it is also possible to be electrical connection; Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be connection or the interaction relationship of two elements of two element internals, unless otherwise clear and definite restriction. For the ordinary skill in the art, it is possible to understand above-mentioned term concrete meaning in the present invention as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact. And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or be merely representative of fisrt feature level height higher than second feature. Fisrt feature second feature " under ", " lower section " and " below " can be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
In one aspect of the invention, the present invention proposes a kind of system processing low-order coal. according to embodiments of the invention, this system includes: hot blast combined type waste rock discharge device, and described hot blast combined type waste rock discharge device has low-order coal entrance, hot-wind inlet, spoil outlet, cleaned coal outlet and offgas outlet, screening plant, described screening plant has cleaned coal entrance, lump coal outlet and fine coal outlet, and described cleaned coal entrance is connected with the outlet of described cleaned coal, pyrolysis installation, described pyrolysis installation has lump coal entrance, semicoke outlet and pyrolysis oil gas vent, and described lump coal entrance is connected with the outlet of described lump coal, semicoke waste-heat recovery device, described semicoke waste-heat recovery device has semicoke entrance, cooling semicoke outlet and heat outlet, and described semicoke entrance is connected with the outlet of described semicoke, and described heat outlet is connected with described hot-wind inlet, fine coal drying device, described fine coal drying device has fine coal entrance, dry hot gas inlet, xeraphium coal export and dry offgas outlet, and described fine coal entrance is connected with the outlet of described fine coal, and gasifying powder coal device, described gasifying powder coal device has the gentle activating QI outlet of dry fine coal entrance, and described dry fine coal entrance is connected with described xeraphium coal export. inventor have found that, by adopting hot blast that low-order coal is processed, not only achieve predrying and discharge refuse integration, and the moisture on low-order coal surface can be removed by pre-dried, thus reducing in discharge refuse process between granule the bonding probability (especially between cleaned coal and spoil), solve the problem that existing combined type discharge refuse technology is low to low-order coal rate of discharging refuse, and solve the inferior problem of the gentle activating QI of pyrolysis product poor quality, namely the system adopting the present invention can significantly improve the quality of gasification product in the quality of pyrolysis product in pyrolytic process and gasification, simultaneously by being dried process before low-order coal is carried out gasification process, gas yield and quality in gasification can be significantly improved, secondly by by combined type discharge refuse technology, dry technology, pyrolytic technique and gasification technology organic integration, cleverly the waste heat produced in pyrolytic process is used for discharge refuse process, processing procedure energy cost can be significantly reduced.
System below with reference to the process low-order coal of-3 pairs of embodiment of the present invention of Fig. 1 is described in detail. According to embodiments of the invention, this system includes: hot blast combined type waste rock discharge device 100, screening plant 200, pyrolysis installation 300, semicoke waste-heat recovery device 400, fine coal drying device 500 and gasifying powder coal device 600.
According to embodiments of the invention, hot blast combined type waste rock discharge device 100 has low-order coal entrance 101, hot-wind inlet 102, spoil outlet 103, cleaned coal outlet 104 and offgas outlet 105, and be suitable for use with hot blast low-order coal is carried out discharge refuse and pre-dried, such that it is able to respectively obtain spoil, cleaned coal and the tail gas containing dust. Inventor have found that, by adopting hot blast that low-order coal is processed, not only achieve predrying and discharge refuse integration, and the moisture on low-order coal surface can be removed by pre-dried, thus reducing in discharge refuse process between granule the bonding probability (especially between cleaned coal and spoil), solve the problem that existing combined type discharge refuse technology is low to low-order coal rate of discharging refuse, and solve the inferior problem of pyrolysis product, namely adopt the system of the present invention can significantly improve the quality of pyrolysis product in pyrolytic process.
According to one embodiment of present invention, the temperature of hot blast is not particularly restricted, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the temperature of hot blast can be 80～130 DEG C.
According to still a further embodiment, the flow velocity of hot blast is not particularly restricted, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the flow velocity of hot blast can be 8～23m/s. Inventor have found that, use this flow rates hot blast can so that in low-order coal cleaned coal and spoil be clearly separated under buoyancy and each self-gravity action, and the moisture on low-order coal surface can be taken away, reduce in discharge refuse process the bonding probability (especially between cleaned coal and spoil) between granule, thus improving quality and the productivity of pyrolysis product in subsequent thermal solution preocess while improving discharge refuse efficiency.
According to embodiments of the invention, screening plant 200 has cleaned coal entrance 201, lump coal outlet 202 and fine coal outlet 203, cleaned coal entrance 201 exports 104 with cleaned coal and is connected, and is suitable to cleaned coal obtained above is carried out screening process, such that it is able to obtain lump coal and fine coal. Thus, it is possible to avoid the waste of subsequent thermal solution preocess cleaned coal, thus the cost that economizes in raw materials.
According to one embodiment of present invention, the particle diameter of lump coal is not particularly restricted, and those skilled in the art can select according to actual needs, according to a particular embodiment of the invention, the particle diameter of lump coal can for being not less than 6mm, and the particle diameter of fine coal can be less than 6mm. Thus, by gained cleaned coal is carried out screening process, the cleaned coal of greater particle size is supplied to subsequent thermal solution preocess, and the cleaned coal of less particle diameter is supplied to follow-up gasification installation and produce the gas that gasifies, such that it is able to be possible not only to avoid the waste of cleaned coal in pyrolytic process, and Business Economic Benefit can be improved.
According to embodiments of the invention, pyrolysis installation 300 has lump coal entrance 301, semicoke outlet 302 and pyrolysis oil gas vent 303, lump coal entrance 301 exports 202 with lump coal and is connected, and is suitable to lump coal obtained for above-mentioned screening is carried out pyrolysis processing, such that it is able to obtain semicoke and pyrolysis oil gas. Inventor have found that, by by combined type discharge refuse technology and pyrolytic technique organic integration so that before low-order coal is carried out pyrolysis processing, carry out discharge refuse process, it is possible to significantly improve hydrocarbon yield in pyrolytic process.
According to one embodiment of present invention, the temperature of pyrolysis processing is not particularly restricted, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the temperature of pyrolysis processing can be 500-900 DEG C.
According to embodiments of the invention, semicoke waste-heat recovery device 400 has semicoke entrance 401, cooling semicoke outlet 402 and heat outlet 403, semicoke entrance 401 exports 302 with semicoke and is connected, heat outlet 403 is connected with hot-wind inlet 102, and be suitable to pyrolytic process gained semicoke is carried out waste heat recovery processing, such that it is able to obtain steam and cooling semicoke, and the temperature controlling steam is 80～110 DEG C, and steam returns hot blast combined type waste rock discharge device 100 uses as hot blast. Inventor have found that, by by combined type discharge refuse technology and pyrolytic technique organic integration, cleverly the waste heat produced in pyrolytic process being used for discharge refuse process, it is possible to significantly reduce processing procedure energy cost.
In this step, concrete, the semicoke waste-heat recovery device semicoke to obtaining in pyrolytic process is adopted to carry out waste heat recovery, the waste heat of semicoke can obtain steam by conversion in waste-heat recovery device, and obtained steam resupplies after voltage stabilizing bag voltage stabilizing to hot blast combined type waste rock discharge device and uses as hot blast.
According to embodiments of the invention, fine coal drying device 500 has fine coal entrance 501, dry hot gas inlet 502, xeraphium coal export 503 and dry offgas outlet 504, fine coal entrance 501 exports 203 with fine coal and is connected, and be suitable for use with dry steam fine coal is dried process, such that it is able to obtain dry tail gas and dry fine coal. Thus, it is possible to significantly improve follow-up coal gasification efficiency.
According to one embodiment of present invention, temperature and the flow velocity of dry steam are not particularly restricted, those skilled in the art can select according to actual needs, according to a particular embodiment of the invention, the temperature of dry steam can be 100～200 degrees Celsius, and the flow velocity of dry steam can be 0.1～0.5m/s. Concrete, obtained xeraphium moisture in coal content is less than 10wt%.
According to embodiments of the invention, gasifying powder coal device 600 has the gentle activating QI outlet 602 of dry fine coal entrance 601, dry fine coal entrance 601 is connected with xeraphium coal export 503, and is suitable to dry fine coal obtained in fine coal drying device is carried out gasification process, such that it is able to obtain gasification gas. Thus, by screening gained fine coal is carried out gasification process, it is possible not only to significantly improve raw material availability, and Business Economic Benefit can be improved.
According to one embodiment of present invention, the temperature of gasification process is not particularly restricted, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the temperature of gasification process can be 800～1100 DEG C.
Thus, low-order coal is processed by the system of process low-order coal according to embodiments of the present invention by adopting hot blast, not only achieve predrying and discharge refuse integration, and the moisture on low-order coal surface can be removed by pre-dried, thus reducing in discharge refuse process between granule the bonding probability (especially between cleaned coal and spoil), solve the problem that existing combined type discharge refuse technology is low to low-order coal rate of discharging refuse, and solve the inferior problem of the gentle activating QI of pyrolysis product poor quality, namely the system adopting the present invention can significantly improve the quality of gasification product in the quality of pyrolysis product in pyrolytic process and gasification, simultaneously by being dried process before low-order coal is carried out gasification process, gas yield and quality in gasification can be significantly improved, secondly by by combined type discharge refuse technology, dry technology, pyrolytic technique and gasification technology organic integration, cleverly the waste heat produced in pyrolytic process is used for discharge refuse process, processing procedure energy cost can be significantly reduced.
With reference to Fig. 2, the system of process low-order coal according to embodiments of the present invention farther includes: dust arrester 700.
According to embodiments of the invention, dust arrester 700 has gas inlet 701, gas outlet 702 and dust outlet 703, gas inlet 701 is connected with offgas outlet 105 and dry offgas outlet 504 respectively, and be suitable to carry out dust removal process by the tail gas containing dust obtained in hot blast combined type waste rock discharge device 100 and fine coal drying device 500 obtain the dry tail gas containing dust, it is possible to collect and obtain dust. Thus, dust removal process is passed through, it is possible to isolate the dust taken out of in tail gas, thus reducing environmental pollution. Concrete, dust arrester can be whirlwind separator.
With reference to Fig. 3, the system of process low-order coal according to embodiments of the present invention farther includes: waste heat boiler 800.
According to embodiments of the invention, waste heat boiler 800 has gasification gas entrance 801, gas exit 802 and superheated steam outlet 803, gasification gas entrance 801 is connected with gasification gas outlet 602, superheated steam outlet 803 is connected with dry hot gas inlet 502, and be suitable to waste heat boiler, the gasification gas obtained in gasifying powder coal device supply is carried out waste heat recovery processing, such that it is able to obtain coal gas and superheated steam, and superheated steam is back to fine coal drying device 500 uses as dry steam. Thus, it is possible to realize making full use of of system waste heat, thus reduce energy cost. Concrete, the superheat steam temperature obtained in waste heat boiler is controlled at 100～200 degrees Celsius, then as the dry medium of fine coal dry run after voltage stabilizing bag voltage stabilizing.
As it has been described above, the system of process low-order coal according to embodiments of the present invention can have selected from following advantage at least one:
The system of process low-order coal according to embodiments of the present invention is by integrated to the sorting of low-order coal, dry, pyrolysis, gasifying process, the waste heat that after ingenious utilization lump coal pyrolysis, semicoke and coal gasification produce, after employing recovery pyrolysis, the waste heat of semicoke is as the separating medium of combined type discharge refuse, waste heat boiler is adopted to reclaim the waste heat of gasification gas as the dry medium of fine coal, reduce system energy consumption and operating cost, reduce environmental pollution, meanwhile, improve effective rate of utilization and the low-order coal transformation efficiency of low-order coal.
The system of process low-order coal according to embodiments of the present invention achieves predrying and sorting integrated in advance, by dirts such as the spoils in dry separation elimination coal, after low-order coal hot blast sorting elimination surface moisture, reduce in assorting room the bonding probability (especially between cleaned coal and spoil) between granule, solve under room temperature in low-order coal dry separation process owing to the adhesion between granule causes a difficult problem for separating effect difference;
The system of process low-order coal according to embodiments of the present invention by raw coal being carried out wholegrain level sorting process, the problems such as when solving low-order coal directly as pyrolysis also non-gasified raw material, the calorific value of upgraded product is low, heat utilization efficiency is low.
The system of process low-order coal according to embodiments of the present invention effect when processing easy coal separation is better.
In another aspect of the invention, the present invention proposes a kind of method processing low-order coal. According to embodiments of the invention, the method is that the system adopting process low-order coal described above carries out. According to a particular embodiment of the invention, the method includes: (1) will adopt hot blast that described low-order coal carries out discharge refuse and pre-dried in low-order coal supply to described hot blast combined type waste rock discharge device, in order to respectively obtains spoil, cleaned coal and the tail gas containing dust;(2) supply of described cleaned coal is carried out screening process to described screening plant, in order to obtain lump coal and fine coal, (3) supply of described lump coal is carried out pyrolysis processing to described pyrolysis installation, in order to obtain semicoke and pyrolysis oil gas, (4) supply of described semicoke is carried out waste heat recovery processing to described semicoke waste-heat recovery device, in order to obtain cooling semicoke and steam, and used as described hot blast by described steam return step (1), (5) described fine coal supply to described fine coal drying device will adopt dry steam described fine coal is dried process, in order to obtain dry tail gas and dry fine coal, and the supply of described dry fine coal is carried out gasification process to described gasifying powder coal device by (6), in order to obtain gasification gas. inventor have found that, by adopting hot blast that low-order coal is processed, not only achieve predrying and discharge refuse integration, and the moisture on low-order coal surface can be removed by pre-dried, thus reducing in discharge refuse process between granule the bonding probability (especially between cleaned coal and spoil), solve the problem that existing combined type discharge refuse technology is low to low-order coal rate of discharging refuse, and solve the inferior problem of the gentle activating QI of pyrolysis product poor quality, namely the system adopting the present invention can significantly improve the quality of gasification product in the quality of pyrolysis product in pyrolytic process and gasification, simultaneously by being dried process before low-order coal is carried out gasification process, gas yield and quality in gasification can be significantly improved, secondly by by combined type discharge refuse technology, dry technology, pyrolytic technique and gasification technology organic integration, cleverly the waste heat produced in pyrolytic process is used for discharge refuse process, processing procedure energy cost can be significantly reduced. it should be noted that the method that above-mentioned feature and advantage described by the system of process low-order coal are equally applicable to this process low-order coal, repeat no more herein.
Method below with reference to the process low-order coal of-6 pairs of embodiment of the present invention of Fig. 4 is described in detail. According to embodiments of the invention, the method includes:
S100: will adopt hot blast that low-order coal carries out discharge refuse and pre-dried in low-order coal supply to hot blast combined type waste rock discharge device
According to embodiments of the invention, low-order coal supply to hot blast combined type waste rock discharge device will adopt hot blast that low-order coal carries out discharge refuse and pre-dried, such that it is able to respectively obtain spoil, cleaned coal and the tail gas containing dust. Inventor have found that, by adopting hot blast that low-order coal is processed, not only achieve predrying and discharge refuse integration, and the moisture on low-order coal surface can be removed by pre-dried, thus reducing in discharge refuse process between granule the bonding probability (especially between cleaned coal and spoil), solve the problem that existing combined type discharge refuse technology is low to low-order coal rate of discharging refuse, and solve the inferior problem of pyrolysis product, namely adopt the system of the present invention can significantly improve the quality of pyrolysis product in pyrolytic process.
According to one embodiment of present invention, the temperature of hot blast is not particularly restricted, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the temperature of hot blast can be 80～130 DEG C.
According to still a further embodiment, the flow velocity of hot blast is not particularly restricted, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the flow velocity of hot blast can be 8～23m/s.Inventor have found that, use this flow rates hot blast can so that in low-order coal cleaned coal and spoil be clearly separated under buoyancy and each self-gravity action, and the moisture on low-order coal surface can be taken away, reduce in discharge refuse process the bonding probability (especially between cleaned coal and spoil) between granule, thus improving quality and the productivity of pyrolysis product in subsequent thermal solution preocess while improving discharge refuse efficiency.
S200: cleaned coal supply is carried out screening process to screening plant
According to embodiments of the invention, cleaned coal obtained above supply is carried out screening process to screening plant, such that it is able to obtain lump coal and fine coal. Thus, it is possible to avoid the waste of subsequent thermal solution preocess cleaned coal, thus the cost that economizes in raw materials.
According to one embodiment of present invention, the particle diameter of lump coal is not particularly restricted, and those skilled in the art can select according to actual needs, according to a particular embodiment of the invention, the particle diameter of lump coal can for being not less than 6mm, and the particle diameter of fine coal can be less than 6mm. Thus, by gained cleaned coal is carried out screening process, the cleaned coal of greater particle size is supplied to subsequent thermal solution preocess, and the cleaned coal of less particle diameter is supplied to follow-up gasification installation and produce the gas that gasifies, such that it is able to be possible not only to avoid the waste of cleaned coal in pyrolytic process, and Business Economic Benefit can be improved.
S300: lump coal supply is carried out pyrolysis processing to pyrolysis installation
According to embodiments of the invention, lump coal obtained for above-mentioned screening is carried out pyrolysis processing, such that it is able to obtain semicoke and pyrolysis oil gas. Inventor have found that, by by combined type discharge refuse technology and pyrolytic technique organic integration so that before low-order coal is carried out pyrolysis processing, carry out discharge refuse process, it is possible to significantly improve hydrocarbon yield in pyrolytic process.
According to one embodiment of present invention, the temperature of pyrolysis processing is not particularly restricted, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the temperature of pyrolysis processing can be 500-900 DEG C.
S400: will semicoke supply to semicoke waste-heat recovery device carries out waste heat recovery processing, and steam returned hot blast combined type waste rock discharge device use as hot blast
According to embodiments of the invention, gained semicoke supply in pyrolytic process is carried out waste heat recovery processing to waste-heat recovery device, such that it is able to obtain steam and cooling semicoke, and the temperature controlling steam is 80～110 DEG C, and steam returns hot blast combined type waste rock discharge device uses as hot blast. Inventor have found that, by by combined type discharge refuse technology and pyrolytic technique organic integration, cleverly the waste heat produced in pyrolytic process being used for discharge refuse process, it is possible to significantly reduce processing procedure energy cost.
In this step, concrete, the semicoke waste-heat recovery device semicoke to obtaining in pyrolytic process is adopted to carry out waste heat recovery, the waste heat of semicoke can obtain steam by conversion in waste-heat recovery device, and obtained steam resupplies after voltage stabilizing bag voltage stabilizing to hot blast combined type waste rock discharge device and uses as hot blast.
S500: fine coal is dried process by adopting dry steam in fine coal supply to fine coal drying device
According to embodiments of the invention, by fine coal supply obtained in screening plant to fine coal drying device adopts dry steam that fine coal is dried process, such that it is able to obtain dry tail gas and dry fine coal. Thus, it is possible to significantly improve follow-up coal gasification efficiency.
According to one embodiment of present invention, temperature and the flow velocity of dry steam are not particularly restricted, those skilled in the art can select according to actual needs, according to a particular embodiment of the invention, the temperature of dry steam can be 100～200 degrees Celsius, and the flow velocity of dry steam can be 0.1～0.5m/s.Concrete, obtained xeraphium moisture in coal content is less than 10wt%.
S600: the supply of dry fine coal is carried out gasification process to gasifying powder coal device
According to embodiments of the invention, dry fine coal supply obtained in fine coal drying device is carried out gasification process to gasifying powder coal device, such that it is able to obtain gasification gas. Thus, by screening gained fine coal is carried out gasification process, it is possible not only to significantly improve raw material availability, and Business Economic Benefit can be improved.
According to one embodiment of present invention, the temperature of gasification process is not particularly restricted, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the temperature of gasification process can be 800～1100 DEG C.
Low-order coal is processed by the method for process low-order coal according to embodiments of the present invention by adopting hot blast, not only achieve predrying and discharge refuse integration, and the moisture on low-order coal surface can be removed by pre-dried, thus reducing in discharge refuse process between granule the bonding probability (especially between cleaned coal and spoil), solve the problem that existing combined type discharge refuse technology is low to low-order coal rate of discharging refuse, and solve the inferior problem of the gentle activating QI of pyrolysis product poor quality, namely the system adopting the present invention can significantly improve the quality of gasification product in the quality of pyrolysis product in pyrolytic process and gasification, simultaneously by being dried process before low-order coal is carried out gasification process, gas yield and quality in gasification can be significantly improved, secondly by by combined type discharge refuse technology, dry technology, pyrolytic technique and gasification technology organic integration, cleverly the waste heat produced in pyrolytic process is used for discharge refuse process, processing procedure energy cost can be significantly reduced.
With reference to Fig. 5, the method for process low-order coal according to embodiments of the present invention farther includes:
S700: the tail gas containing dust and dry tail gas are supplied and carries out dust removal process to dust arrester
According to embodiments of the invention, the tail gas containing dust obtained is carried out dust removal process to dust arrester, it is possible to collect and obtain pelletizing in the supply of the tail gas containing dust obtained for step S100 and step S500. Thus, dust removal process is passed through, it is possible to isolate the dust taken out of in tail gas, thus reducing environmental pollution. Concrete, dust arrester can be whirlwind separator.
With reference to Fig. 6, the method for process low-order coal according to embodiments of the present invention farther includes:
S800: the supply of gasification gas is carried out waste heat recovery processing to waste heat boiler, and superheated steam is returned in S500 as dry-heat air use
According to embodiments of the invention, the gasification gas obtained supply is carried out waste heat recovery processing to waste heat boiler, such that it is able to obtain coal gas and superheated steam, and superheated steam is back to fine coal drying device 500 uses as dry steam in gasifying powder coal device. Thus, it is possible to realize making full use of of system waste heat, thus reduce energy cost. Concrete, the superheat steam temperature obtained in waste heat boiler is controlled at 100～200 degrees Celsius, then as the dry medium of fine coal dry run after voltage stabilizing bag voltage stabilizing.
Below with reference to specific embodiment, present invention is described, it is necessary to explanation, and these embodiments are only illustrative, and do not limit the present invention in any way.
Embodiment
Adopt the processs low-order coal shown in Fig. 7 system low-order coal raw coal is processed, the raw coal treating capacity of the present embodiment is 300,000 tons/year, process particle size range be full particle size fraction, the moisture of raw coal, ash, sulphur content, calorific value analysis result as shown in table 1.
The analysis result of table 1 raw coal character
| Full water (wt%) | Ash (wt%) | Sulphur content (wt%) | Lower heat value (kcal/kg) |
| Mt | Aad | St,ad | Qnet,ar |
| 25.72 | 21.70 | 1.05 | 3622.79 |
Detailed description of the invention includes the processing step of following sequence:
1), first raw coal is carried out de-cash process by run coal bin by belt and feeder feeding hot blast combined type waste rock discharge device, control hot blast temperature 105 DEG C, ascending air speed 10.76m/s, raw coal is after hot blast combined type discharge refuse processes, obtain head coal product, the moisture of cleaned coal, ash, sulphur content respectively 20.34%, 14.52%, 0.77%, has just started with outer hot wind supply as discharge refuse medium;
2), by 1) cleaned coal that produces feeds and carries out screening process in screening plant, obtains lump coal (granularity is not less than 6mm) and fine coal (granularity is less than 6mm);
3), by obtained block cleaned coal sending into pyrolysis installation and carry out pyrolysis processing, pyrolysis temperature is 600 DEG C, obtains pyrolysis oil gas and semicoke, and wherein the butt productivity of gained semicoke is 69.02%, and the ash of semicoke is 20.60%;
4), obtained semicoke supply is carried out remaining recycling to semicoke waste-heat recovery device, obtain cooling semicoke and steam, and obtained steam (80～110 DEG C) is sent into after voltage stabilizing in hot blast combined type waste rock discharge device as hot blast use;
5), by fine coal sending into fine coal drying device and be dried process, obtain dry fine coal, the dry medium just begun with is superheated steam, and baking temperature is 150 DEG C, the moisture 7.44% of dry fine coal;
6), by step 1) gained sorting tail gas and step 5) the dry tail gas supply of gained gathers dust to dust arrester;
7), dry fine coal is fed gasification installation carries out gasification process, obtain gasification gas, gasification temperature is 950 DEG C, gasifying agent is oxygen/steam, then gasification gas is entered in waste heat boiler and carry out recovery waste heat, obtain coal gas and superheated steam, and will superheated steam supply to fine coal drying device use as dry medium, from waste heat boiler coal gas out, the volume content of hydrogen is 33.97%, and the volume content of carbon monoxide is 32.28%.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention. In this manual, the schematic representation of above-mentioned term is necessarily directed to identical embodiment or example. And, the specific features of description, structure, material or feature can combine in one or more embodiments in office or example in an appropriate manner. Additionally, when not conflicting, the feature of the different embodiments described in this specification or example and different embodiment or example can be carried out combining and combining by those skilled in the art.
Although above it has been shown and described that embodiments of the invention, it is understandable that, above-described embodiment is illustrative of, it is impossible to be interpreted as limitation of the present invention, and above-described embodiment can be changed, revises, replace and modification by those of ordinary skill in the art within the scope of the invention.
Claims (10)
1. the system processing low-order coal, it is characterised in that including:
Hot blast combined type waste rock discharge device, described hot blast combined type waste rock discharge device has low-order coal entrance, hot-wind inlet, spoil outlet, cleaned coal outlet and offgas outlet;
Screening plant, described screening plant has cleaned coal entrance, lump coal outlet and fine coal outlet, and described cleaned coal entrance is connected with the outlet of described cleaned coal;
Pyrolysis installation, described pyrolysis installation has lump coal entrance, semicoke outlet and pyrolysis oil gas vent, and described lump coal entrance is connected with the outlet of described lump coal;
Semicoke waste-heat recovery device, described semicoke waste-heat recovery device has semicoke entrance, cooling semicoke outlet and heat outlet, and described semicoke entrance is connected with the outlet of described semicoke, and described heat outlet is connected with described hot-wind inlet;
Fine coal drying device, described fine coal drying device has fine coal entrance, dry hot gas inlet, xeraphium coal export and dry offgas outlet, and described fine coal entrance is connected with the outlet of described fine coal; And
Gasifying powder coal device, described gasifying powder coal device has the gentle activating QI outlet of dry fine coal entrance, and described dry fine coal entrance is connected with described xeraphium coal export.
2. system according to claim 1, it is characterised in that farther include:
Dust arrester, described dust arrester has gas inlet, gas outlet and dust outlet, and described gas inlet is connected with described offgas outlet and described dry offgas outlet respectively.
3. system according to claim 1 and 2, it is characterised in that farther include:
Waste heat boiler, described waste heat boiler has gasification gas entrance, gas exit and superheated steam outlet, and described gasification gas entrance is connected with the outlet of described gasification gas, and the outlet of described superheated steam is connected with described dry hot gas inlet.
4. the system of the process low-order coal that a kind adopts described in any one of claim 1-3 processes the method for low-order coal, it is characterised in that including:
(1) low-order coal supply to described hot blast combined type waste rock discharge device will adopt hot blast that described low-order coal carries out discharge refuse and pre-dried, in order to respectively obtain spoil, cleaned coal and the tail gas containing dust;
(2) supply of described cleaned coal is carried out screening process to described screening plant, in order to obtain lump coal and fine coal;
(3) supply of described lump coal is carried out pyrolysis processing to described pyrolysis installation, in order to obtain semicoke and pyrolysis oil gas;
(4) supply of described semicoke is carried out waste heat recovery processing to described semicoke waste-heat recovery device, in order to obtain cooling semicoke and steam, and used as described hot blast by described steam return step (1);
(5) described fine coal supply to described fine coal drying device will adopt dry steam described fine coal is dried process, in order to obtain dry tail gas and dry fine coal; And
(6) supply of described dry fine coal is carried out gasification process to described gasifying powder coal device, in order to obtain gasification gas.
5. method according to claim 4, it is characterised in that farther include: the described tail gas containing dust and described dry tail gas are supplied and carries out dust removal process to described dust arrester by (7), in order to collect dust.
6. the method according to claim 4 or 5, it is characterised in that farther include:
(8) will the supply of described gasification gas to described waste heat boiler carries out waste heat recovery processing, in order to obtain coal gas and superheated steam, and described superheated steam is back to step (5) uses as described dry steam.
7. the method according to any one of claim 4-6, it is characterised in that in step (1), the temperature of described hot blast is 80～130 degrees Celsius, and the flow velocity of described hot blast is 8～23m/s.
8. the method according to any one of claim 4-7, it is characterised in that in step (2), the particle diameter of described lump coal is not less than 6mm.
9. the method according to any one of claim 4-8, it is characterised in that in step (3), the temperature of described pyrolysis processing is 500-900 degree Celsius.
10. the method according to any one of claim 4-9, it is characterised in that in step (5), the temperature of described dry steam is 100～200 degrees Celsius, and the flow velocity of described dry steam is 0.1～0.5m/s,
Optional, in step (6), the temperature of described gasification 800～1100 degrees Celsius.
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