CN111394137A - Gasification and pyrolysis coupling device and gasification and pyrolysis method - Google Patents
Gasification and pyrolysis coupling device and gasification and pyrolysis method Download PDFInfo
- Publication number
- CN111394137A CN111394137A CN202010322906.0A CN202010322906A CN111394137A CN 111394137 A CN111394137 A CN 111394137A CN 202010322906 A CN202010322906 A CN 202010322906A CN 111394137 A CN111394137 A CN 111394137A
- Authority
- CN
- China
- Prior art keywords
- gasification
- pyrolysis
- cavity
- unit
- semicoke
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- C10J3/58—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
- C10J3/60—Processes
- C10J3/64—Processes with decomposition of the distillation products
- C10J3/66—Processes with decomposition of the distillation products by introducing them into the gasification zone
-
- 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
- C10J3/72—Other features
-
- 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
- C10J3/72—Other features
- C10J3/721—Multistage gasification, e.g. plural parallel or serial gasification stages
-
- 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
- C10J3/72—Other features
- C10J3/80—Other features with arrangements for preheating the blast or the water vapour
-
- 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
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
- C10J2300/0936—Coal fines for producing producer gas
-
- 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
-
- 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
- C10J2300/12—Heating the gasifier
- C10J2300/1207—Heating the gasifier using pyrolysis gas as fuel
-
- 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
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1687—Integration of gasification processes with another plant or parts within the plant with steam generation
-
- 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
- C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
- C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Industrial Gases (AREA)
Abstract
The invention belongs to the technical field of coal gasification pyrolysis, and relates to a gasification and pyrolysis coupling device and a gasification pyrolysis method, wherein the gasification and pyrolysis coupling device comprises a vertical pyrolysis unit and a gasification unit communicated with the vertical pyrolysis unit; the vertical pyrolysis unit comprises a furnace body, and the furnace body is divided into a gas collection cavity, a pyrolysis cavity, a waste heat recovery cavity and a cooling cavity from top to bottom; a coal gas inlet and a high-temperature semicoke outlet are formed in the pyrolysis cavity; a high-temperature semicoke outlet is formed in the lower side of the pyrolysis cavity and communicated with a feed inlet of the gasification unit; a high-temperature medium outlet of the waste heat recovery cavity is communicated with a gasifying agent inlet of the gasifying unit; the coal gas inlet of the pyrolysis cavity is communicated with the coal gas outlet of the gasification unit. The invention couples the coal pyrolysis with the semicoke gasification, converts the coal into high-quality medium-low temperature coal tar and coal gas in the vertical pyrolysis unit, realizes the grading conversion and optimized integration of the pulverized coal pyrolysis and the semicoke gasification, enriches the high-quality coal tar and the coal gas, reduces the fuel consumption required by the process and improves the energy utilization efficiency of the system.
Description
Technical Field
The invention belongs to the technical field of coal gasification pyrolysis, and particularly relates to a gasification and pyrolysis coupling device and a gasification pyrolysis method.
Background
Based on the current situation of energy supply and consumption structure in China, the status of coal as main energy in China does not change radically. At present, China mainly uses a direct combustion-based coal resource utilization mode, basically only uses the combustion property of coal, and causes high-added-value components of the coal to be burnt as fuel and seriously pollute the environment. Therefore, the development of a plurality of technologies is coupled, the coal resources can be utilized in a gradient manner, and the clean and efficient coal quality-based conversion and utilization technology is a problem which needs to be solved in the coal chemical industry of China at present.
According to the structure and physicochemical properties of coal, a coal quality-based utilization technology of coal, oil, gas, electricity and chemical integrated poly-generation by taking pyrolysis as a leading part is implemented, the maximization of the overall resource conversion efficiency is emphasized, the centralized and comprehensive treatment of pollutants in the conversion process is realized, and the economic, social and environmental benefits in the coal conversion process can be greatly improved.
In recent years, dozens of coal pyrolysis technologies are researched and developed at home and abroad, and the coal pyrolysis technology has various characteristics according to different heating modes, furnace type structures and heat carrier forms. Some are in the laboratory research stage, some are in the pilot plant test stage, some are in the industrialized demonstration stage, the existing coal pyrolysis technology has the main problems that some devices have large investment and poor economic benefit; some investments are small but pollute the environment; some have low resource utilization rate and energy conversion efficiency.
High-calorific-value coal gas, coal tar and high-activity clean semicoke generated by coal pyrolysis are important rings of coal gradient utilization, but dust removal of the pyrolyzed raw gas is a bottleneck for restricting large-scale industrialization of the process. The vertical furnace pyrolysis utilizes lump coal or seed coal, integrates combustion, partial gasification, pyrolysis and raw coke oven gas cooling, overcomes the problem of dust removal of raw coke oven gas, has compact structure, high thermal efficiency, small investment and industrialization, but has low thermal value of the gas, great pollution to the environment of water coke quenching, very difficult recovery and utilization of sensible heat of dry coke quenching solid, and urgent need for optimization and perfection.
Coal gasification is a process in which coal or coke and a gasification agent undergo a chemical reaction at high temperature to convert the coal or coke into gas. Large-scale high-pressure continuous gasification is widely applied to production, but the investment is large and the operation cost is large. The conventional continuous normal-pressure oxygen-enriched and pure-oxygen gasification technology for the granular coal or the granular coke is quite mature, is widely applied to actual production due to low investment and low operating cost, but has low thermal efficiency and cold gas efficiency in the gasification process.
Disclosure of Invention
Based on the defects, the invention provides a gasification and pyrolysis coupling device, which couples coal pyrolysis and semicoke gasification together, utilizes sensible heat of high-temperature coal gas generated by gasification of semicoke in a gasification unit to provide required energy for pyrolysis of low-rank coal, converts coal into high-quality medium-low-temperature coal tar and coal gas in a vertical pyrolysis unit, realizes graded conversion and optimized integration of pulverized coal pyrolysis and semicoke gasification, richly produces high-quality coal tar and coal gas, reduces fuel consumption required by coal pyrolysis and gasification processes, improves the energy utilization efficiency of a system, widens the utilization path of semicoke, and realizes the aims of high efficiency and low consumption in the coal chemical industry.
Simultaneously, the application also provides a gasification pyrolysis method realized by utilizing the gasification and pyrolysis coupling device.
The technical scheme adopted by the invention is as follows:
a gasification and pyrolysis coupling device comprises a vertical pyrolysis unit and a gasification unit communicated with the vertical pyrolysis unit;
the vertical pyrolysis unit comprises a furnace body, wherein the furnace body is divided into a gas collection cavity 1, a pyrolysis cavity 2, a waste heat recovery cavity 3 and a cooling cavity 4 from top to bottom; a coal gas inlet and a high-temperature semicoke outlet are formed in the pyrolysis cavity 2; a high-temperature semicoke outlet is formed in the lower side of the pyrolysis cavity 2 and is communicated with a feed inlet of the gasification unit; a high-temperature medium outlet of the waste heat recovery cavity 3 is communicated with a gasification agent inlet of the gasification unit; the coal gas inlet of the pyrolysis cavity 2 is communicated with the coal gas outlet of the gasification unit, so that a part of semicoke generated by pyrolysis in the pyrolysis cavity 2 is used as a reaction raw material for generating high-temperature coal gas in the gasification unit to participate in gasification reaction, and the other part of semicoke is subjected to countercurrent heat exchange with a gasification agent of the gasification unit in the waste heat recovery cavity 3.
Further limiting, the gasification unit comprises a gasification reactor 5, a slag discharge mechanism 7 arranged at the bottom of an inner cavity of the gasification reactor 5 and a jacket steam cavity 6 arranged at the outer side of the bottom end of the gasification reactor 5, wherein a gasification agent inlet is formed at the bottom of the gasification reactor 5, and the slag discharge mechanism 7 is arranged right above the gasification agent inlet, so that ash slag of gasification reaction is discharged from the outer side of the gasification agent inlet through the slag discharge mechanism 7; a steam outlet is formed in the jacket steam cavity 6 and communicated with a mixed gas inlet of the waste heat recovery cavity 3 through a pipeline; the upper part of the gasification reactor 5 is provided with a coal gas outlet which is communicated with a coal gas inlet of the pyrolysis cavity 2 through a pipeline, high-temperature semicoke is used as a reaction heat source in the gasification reactor 5 and reacts with a gasifying agent to generate high-temperature coal gas sensible heat, the high-temperature coal gas sensible heat enters the pyrolysis cavity 2 to directly provide required energy for pyrolysis of low-rank coal, the pyrolysis environment is changed, and the quality of the semicoke is improved.
Further limiting, the gasification unit further comprises an ash buffer bin 8, wherein an inlet of the ash buffer bin 8 is communicated with a slag discharge port of the slag discharge mechanism 7, and ash generated after gasification reaction is cooled and discharged.
Further limiting, heat exchange tubes 31 which are vertically arranged are arranged in the waste heat recovery cavity 3, the horizontal distance between the heat exchange tubes 31 is 30-80mm, and every two adjacent rows of heat exchange tubes are connected through a plate; the distance between the rows and the lines is 150-300mm, and the heat exchange efficiency and the waste heat recovery efficiency are improved by the arrangement of the waste heat recovery cavity and the arrangement of the heat exchange tubes.
Further, a coke pusher 41 is arranged below the cooling cavity 4 of the vertical pyrolysis unit, and an air lock is arranged at the semi-coke outlet end of the coke pusher 41.
A gasification pyrolysis method realized by utilizing the gasification and pyrolysis coupling device comprises the following steps:
(1) seed coal of 6-80mm raw material enters a vertical pyrolysis unit under the action of gravity, the seed coal is subjected to countercurrent heat exchange with high-temperature coal gas of 800-1200 ℃ generated by a gasification unit in a pyrolysis cavity 2 of the vertical pyrolysis unit, the temperature is gradually increased to 500-800 ℃ for pyrolysis reaction, and the generated raw coal gas is discharged together with the gasified coal gas through a gas collection cavity 1;
(2) part of the pyrolyzed semicoke directly enters the gasification unit under the action of gravity, and is subjected to gasification reaction with a gasification agent introduced into the bottom of the gasification unit, and high-temperature coal gas generated after the reaction is led out from the gasification unit and then enters a pyrolysis cavity 2 of the vertical pyrolysis unit for pyrolysis reaction; the other part of the semicoke directly enters the waste heat recovery cavity 3, the waste heat recovery cavity 3 exchanges heat with the water vapor discharged by the gasification unit, the semicoke is cooled and then discharged, and the water vapor is heated to 300-450 ℃ and then returns to the gasification unit to be reused as a gasification agent.
Further limiting, the step (2) is specifically as follows:
(2.1) directly feeding one part of the pyrolyzed semicoke at 500-700 ℃ into a gasification unit under the action of gravity, carrying out gasification reaction with a gasification agent introduced into the bottom, and directly feeding the other part of the pyrolyzed semicoke into a waste heat recovery cavity 3; the flow ratio of the semicoke entering the gasification unit to the semicoke entering the waste heat recovery cavity 3 is 1: 0.5 to 1;
(2.2) absorbing the waste heat after the gasification reaction by the deoxygenated water in the jacket steam cavity 6 of the gasification unit, conveying the generated medium-pressure water steam to the waste heat recovery cavity 3, guiding out high-temperature coal gas generated after the gasification reaction from bottom to top, then entering the bottom of the pyrolysis cavity 2 of the vertical pyrolysis unit, uniformly distributing the high-temperature coal gas at the bottom of the pyrolysis cavity 2 through a gas distributor 21, and making the high-temperature coal gas in countercurrent contact with seed coal in the process of flowing from bottom to top to finish the pyrolysis reaction in the step (1);
(2.3) the semicoke entering the waste heat recovery cavity 3 exchanges heat with the medium-pressure steam generated by the jacket steam cavity 6 to pre-cool the semicoke, and the medium-pressure steam is output from the high-temperature medium outlet after being heated by heat exchange and then is conveyed into the gasification reactor 5 of the gasification unit through a pipeline to participate in gasification reaction as a gasification agent, and the process is circulated;
and (2.4) discharging the pre-cooled semicoke after entering the cooling cavity 4 for cooling.
Further limiting, the step (2.3) is specifically:
and the semicoke entering the waste heat recovery cavity 3 longitudinally exchanges heat with medium-pressure steam generated by the jacket steam cavity 6 to pre-cool the semicoke to 300-450 ℃, and the medium-pressure steam is output from a high-temperature medium outlet after being heated to 300-450 ℃ through heat exchange and then is conveyed into a gasification reactor 5 of the gasification unit through a pipeline to participate in gasification reaction as a gasification agent, and the process is circulated.
Compared with the prior art, the application has the advantages that:
(1) the coal pyrolysis and the semicoke gasification are coupled together, the sensible heat of high-temperature coal gas generated by gasification of semicoke in the gasification unit is utilized to directly provide required energy for pyrolysis of low-rank coal, the coal is converted into high-quality medium-low temperature coal tar and coal gas in the vertical pyrolysis unit, grading conversion and optimized integration of pulverized coal pyrolysis and semicoke gasification are realized, and high-quality coal tar and coal gas are enriched; and the semicoke that produces among the pyrolysis process directly gets into gasification unit and gasifies, has realized pyrolysis process and gasification process material and energy coupling, simultaneously, utilizes semicoke to carry out the heat transfer with the gasifying agent before the cooling, improves the income stove temperature of gasifying agent, has improved heat utilization rate.
(2) The utility model provides a gasification unit and pyrolysis oven coupling gasification pyrolysis technology, the high temperature gasification gas that adopts gasification unit gets into the pyrolysis section and carries out direct pyrolysis, combustion reaction does not take place, the quality of semicoke has been improved, the ash content of semicoke has been reduced, can reduce the index of conventional vertical pyrolysis unit product semicoke ash content 15% -20% to semicoke ash content to 5-10%, the required fuel consumption of coal pyrolysis and gasification technology has been reduced, the energy utilization efficiency of system has been improved, and the utilization approach of semicoke has been widened, the high-efficient low-consumption target of coal chemical industry has been realized.
(3) The application realizes effective coupling and integrated optimization of energy, materials, products, processes and devices, greatly improves energy conversion efficiency, and has higher energy conversion efficiency than conventional pyrolysis processes and other coal conversion technologies.
(4) In this application, because the addition of gasification unit, the pyrolysis environment of pyrolysis oven has been improved, therefore the quality of pyrolysis tar and pyrolysis gas has been changed, and simultaneously, can increase the yield of tar and pyrolysis gas, can improve the tar yield to more than 120% of coal ge jin yield, the high temperature coal gas that adopts the gasification production is as gaseous heat carrier, do the heat carrier technique contrast with conventional adoption flue gas, do not have other gas to intervene, the carbon dioxide emission of unit product obviously reduces, the pyrolysis gas principal components that produces is CO, CH4、H2(the content of the three is as high as 80%), the coal gas basically does not contain nitrogen, the heat value is high, the quality of pyrolysis gas is good, and the defects of the conventional method are overcomeN in pyrolysis gas generated by using combustion flue gas as heat carrier in vertical furnace pyrolysis2、CO2The content is very high.
(5) In this application, the gaseous heat carrier of system is done to the high temperature water gas that utilizes the gasification to produce, and with the direct gasification of the high temperature semicoke after the pyrolysis, with the conventional adoption flue gas do the heat carrier technique contrast, the carbon dioxide emission of unit product obviously reduces.
(6) This application utilizes waste heat recovery chamber 3 to precool the semicoke earlier before the semicoke cooling, makes waste heat recovery, improves the cooling effect of semicoke moreover greatly to there is the independent channel, and the ash content after the semicoke gasification is discharged alone, can the ash content of effectual reduction semicoke, improves the quality of product semicoke.
(7) Compared with the conventional gasification unit technology, the gasification unit technology has the advantages that the structural design of the top coal feeding and the preheating section of the upper section is cancelled, the gas collection system is added, the height of the furnace body is reduced, the size of equipment is reduced, the investment of the device is saved, the operation cost is reduced, the heat loss is reduced, the gasification unit is coupled with the pyrolysis furnace, and the gas making capacity and the thermal efficiency of the device are effectively improved.
Drawings
Fig. 1 is a schematic structural view of a gasification and pyrolysis coupling device according to the present application.
Detailed Description
The technical solution of the present invention will now be described in detail with reference to the accompanying drawings and examples.
The method for efficient gasification and pyrolysis is used for treating seed coal with the particle size of 6-80mm, raw coal with the particle size smaller than 80mm is screened or washed in a coal mine, and pulverized coal with the particle size smaller than 6mm is screened again before entering a furnace.
The method is mainly realized by the following steps:
(1) seed coal of 6-80mm raw material enters a vertical pyrolysis unit under the action of gravity, the seed coal is subjected to countercurrent heat exchange with high-temperature coal gas of 800-1200 ℃ generated by a gasification unit in a pyrolysis cavity 2 of the vertical pyrolysis unit, the temperature is gradually increased to 500-800 ℃ for pyrolysis reaction, and the generated raw coal gas is discharged together with the gasified coal gas through a gas collection cavity 1;
(2) part of the pyrolyzed semicoke directly enters the gasification unit under the action of gravity, and is subjected to gasification reaction with a gasification agent introduced into the bottom of the gasification unit, and high-temperature coal gas generated after the reaction is led out from the gasification unit and then enters a pyrolysis cavity 2 of the vertical pyrolysis unit for pyrolysis reaction; the other part of the semicoke directly enters the waste heat recovery cavity 3, the upper part of the waste heat recovery cavity 3 exchanges heat with the gasifying agent discharged from the gasification unit, the lower part of the waste heat recovery cavity exchanges heat with desalted water, the semicoke is discharged after being cooled, and the gasifying agent returns to the gasification unit for recycling after being heated.
In order to realize the method for high-efficiency gasification pyrolysis, the method can be realized by a gasification and pyrolysis coupling device which is described below.
The utility model provides a gasification and pyrolysis coupling device includes vertical pyrolysis unit and the gasification unit who communicates with it, and the high-temperature coal gas of gasification unit passes through the pipeline and carries participation seed coal pyrolytic reaction in vertical pyrolysis unit, and the medium-pressure steam of gasification unit gets into in the vertical pyrolysis unit with the semicoke heat transfer after the pyrolysis, realizes the precooling to the semicoke, and the medium-pressure steam heats and returns after rising temperature the gasification unit and participate in gasification reaction as the gasifying agent, realizes the coupling of pyrolysis and gasification.
The vertical pyrolysis unit comprises a furnace body, wherein the furnace body is divided into a gas collection cavity 1, a pyrolysis cavity 2, a waste heat recovery cavity 3 and a cooling cavity 4 from top to bottom; a coal gas inlet and a high-temperature semicoke outlet are formed in the pyrolysis cavity 2; a high-temperature semicoke outlet is formed in the lower side of the pyrolysis cavity 2 and is communicated with a feed inlet of the gasification unit; a high-temperature medium outlet of the waste heat recovery cavity 3 is communicated with a gasification agent inlet of the gasification unit; a coal gas inlet of the pyrolysis cavity 2 is communicated with a coal gas outlet of the gasification unit, so that a part of semicoke generated by pyrolysis of the pyrolysis cavity 2 is used as a reaction raw material for generating high-temperature coal gas by the gasification unit to participate in gasification reaction, and the other part of semicoke is subjected to countercurrent heat exchange with a gasification agent of the gasification unit in the waste heat recovery cavity 3;
the waste heat recovery cavity 3 is internally provided with a plurality of rows of vertically arranged heat exchange tubes 31, the horizontal distance between each heat exchange tube 31 and the heat exchange tube is 30-80mm, each two adjacent rows of heat exchange tubes are connected by a plate, and the distance between each row of heat exchange tubes and the adjacent row of heat exchange tubes is 150-300mm, so that the semi-coke heat exchange pre-cooling device is convenient to fall down.
The gasification unit comprises a gasification reactor 5, a slag discharging mechanism 7 arranged at the bottom of an inner cavity of the gasification reactor 5, a jacket steam cavity 6 arranged at the outer side of the bottom end of the gasification reactor 5 and an ash slag buffer bin 8 communicated with the slag discharging mechanism 7; a gasification agent inlet is formed at the bottom of the gasification reactor 5, and a slag discharging mechanism 7 is arranged right above the gasification agent inlet, so that ash slag of gasification reaction is discharged from the outer side of the gasification agent inlet through the slag discharging mechanism 7; a steam outlet is formed in the jacket steam cavity 6 and communicated with a mixed gas inlet of the waste heat recovery cavity 3 through a pipeline; the upper part of the gasification reactor 5 is provided with a coal gas outlet which is communicated with the coal gas inlet of the pyrolysis cavity 2 through a pipeline.
Example 1
Referring to fig. 1, the gasification and pyrolysis coupling device of the present embodiment includes a vertical pyrolysis unit and a gasification unit communicated therewith;
the vertical pyrolysis unit comprises a furnace body, wherein the furnace body is divided into a gas collecting cavity 1, a pyrolysis cavity 2, a waste heat recovery cavity 3 and a cooling cavity 4 from top to bottom; a gas collection distribution pipe 11 is arranged in the gas collection cavity 1, and crude gas collected from bottom to top is filtered by the seed coal and then discharged from a crude gas outlet arranged on the cavity of the gas collection cavity 1. The pyrolysis cavity 2 is arranged below the gas collecting cavity 1, the height of the cavity of the pyrolysis cavity 2 is 5000mm, the pyrolysis cavity 2 is used for performing countercurrent heat exchange between the seed coal and high-temperature coal gas of 800-1200 ℃ generated by the gasification unit, the seed coal is gradually heated to 500-800 ℃ to perform pyrolysis reaction, the pyrolyzed raw coal gas rises to the gas collecting cavity 1, and the pyrolyzed seed coal further falls to the waste heat recovery cavity 3. A coal gas inlet and a high-temperature semicoke outlet are formed on the pyrolysis cavity 2; the downside in pyrolysis chamber 2 has been seted up high temperature semicoke and has been led the export, and the export is led to high temperature semicoke and gasification unit's feed inlet intercommunication, and the semicoke partly emission after will pyrolyzing is to gasification unit in. The lower part in the pyrolysis cavity 2 is also provided with a gas distributor 21, the gas inlet of the gas distributor 21 is communicated with the gasification unit, high-temperature coal gas generated by the gasification unit is directly led into the pyrolysis cavity 2 through the gas distributor 21 and is radially distributed in the pyrolysis cavity 2, so that the high-temperature coal gas is uniformly distributed in the pyrolysis cavity 2 and forms countercurrent contact heat exchange with seed coal moving from top to bottom, the seed coal is pyrolyzed, and raw coke gas generated after reaction enters the gas collection cavity 1 after being filtered by the seed coal or semicoke from bottom to top. In order to ensure the pyrolysis effect, the gas distributor 21 should be arranged above the high-temperature semicoke outlet, so that semicoke is generated after pyrolysis of the seed coal and is led out from the high-temperature semicoke outlet to enter the gasification unit. One part of the pyrolyzed high-temperature semicoke is led out through a high-temperature semicoke outlet, and the other part of the pyrolyzed high-temperature semicoke directly falls into the waste heat recovery cavity 3. The waste heat recovery cavity 3 and the pyrolysis cavity 2 are arranged in the same diameter, the cavity height of the waste heat recovery cavity 3 is 2000mm, the waste heat recovery cavity is mainly used for pre-cooling the pyrolyzed semicoke, a high-temperature medium outlet and a mixed gas inlet are formed in the side wall of the waste heat recovery cavity 3, heat exchange tubes 31 which are vertically arranged are arranged on the side wall of an inner cavity of the waste heat recovery cavity 3, the horizontal distance between the heat exchange tubes 31 is 60mm, and every two adjacent rows of heat exchange tubes are connected through a plate; the row spacing is 200mm, the outlet of the heat exchange tube 31 is communicated with the high-temperature medium outlet, the inlet of the heat exchange tube 31 is communicated with the mixed gas inlet, the waste heat recovery cavity 3 is communicated with the steam outlet of the gasification unit through the mixed gas inlet, the mixed gas of medium-pressure water vapor and oxygen is introduced into the cavity to form a heat exchange gas channel, the mixed gas of the medium-pressure water vapor and the oxygen is used as a heat exchange medium to perform countercurrent heat exchange with high-temperature semicoke, the temperature of the semicoke is reduced, and the high-temperature gas after heat exchange is conveyed to the gasification unit through a pipeline communicated with the high-temperature medium outlet and is recycled as a gasification agent of the gasification unit. The cooled semicoke enters the cooling cavity 4 after being cooled, the cooling cavity 4 is cooled and cooled through desalted water heat exchange, a coke pusher 41 is arranged below the cooling cavity 4, an air locker is arranged at the semicoke outlet end of the coke pusher 41, the semicoke is discharged by the air locker to isolate gas, the cooled semicoke is discharged through the coke pusher 41, and is sent into the interlocked air locker through a scraping plate, and finally the cooled semicoke is discharged as a product. The gasification unit of the embodiment comprises a gasification reactor 5, a slag discharging mechanism 7 arranged at the bottom of an inner cavity of the gasification reactor 5, a jacket steam cavity 6 arranged at the outer side of the bottom end of the gasification reactor 5, and an ash buffer bin 8 communicated with the slag discharging mechanism 7; a gasification agent inlet is formed at the bottom of the gasification reactor 5, and a slag discharging mechanism 7 is arranged right above the gasification agent inlet, so that ash slag of gasification reaction is discharged from the outer side of the gasification agent inlet through the slag discharging mechanism 7; the inlet of the ash buffer bin 8 is communicated with the slag discharge port of the slag discharge mechanism 7, ash is discharged to the ash buffer bin 8 for buffering, and the ash is discharged after cooling. A steam outlet is formed in the jacket steam cavity 6 and is communicated with a mixed gas inlet of the waste heat recovery cavity 3 through a pipeline; the upper part of the gasification reactor 5 is provided with a gas guide outlet, a gas collection distribution pipe 11 is also arranged at the position facing the gas guide outlet in the gasification reactor 5, the gas collection distribution pipe 11 has the same structure with the gas collection distribution pipe 11 of the pyrolysis cavity 2, the main function of the gas collection distribution pipe is to lead out the gas generated by the gasification reaction through the gas guide outlet, the gas guide outlet is communicated with the gas inlet of the pyrolysis cavity 2 through a pipeline, the high-temperature gas is guided into the pyrolysis cavity 2, the pyrolysis environment in the pyrolysis cavity 2 is changed, and the direct sensible heat is used as a gas heat carrier and directly exchanges heat with the pyrolyzed high-temperature semicoke to generate the pyrolysis reaction.
In this embodiment, the vertical gasification and pyrolysis coupling device is used for the gasification and pyrolysis of the seed coal, and the specific method and the detection result are as follows:
(1) seed coal of 6-80mm raw material enters a vertical pyrolysis unit under the action of gravity, the seed coal is subjected to countercurrent heat exchange with high-temperature coal gas of about 1000 ℃ generated by a gasification unit in a pyrolysis cavity 2 arranged in the vertical pyrolysis unit, the temperature is gradually increased to about 800 ℃ to perform pyrolysis reaction, and the generated raw coal gas is discharged together with the gasified coal gas through a gas collection cavity 1;
(2) part of the pyrolyzed semicoke directly enters the gasification unit under the action of gravity, and is subjected to gasification reaction with a gasification agent introduced into the bottom of the gasification unit, and high-temperature coal gas generated after the reaction is led out from the gasification unit and then enters a pyrolysis cavity 2 of the vertical pyrolysis unit for pyrolysis reaction; the other part semicoke directly gets into waste heat recovery chamber 3, and at 3 upper portions in waste heat recovery chamber and gasification unit exhaust gas agent heat transfer, lower part and desalinized water heat transfer, discharge after making the semicoke cooling, and the gasification agent heats up the back and returns gasification unit retrieval and utilization, specifically is:
(2.1) directly feeding a part of the pyrolyzed semicoke into a gasification unit under the action of gravity to perform gasification reaction with a gasification agent introduced into the bottom, and directly feeding the other part of the pyrolyzed semicoke into a waste heat recovery cavity 3; the flow ratio of the semicoke entering the gasification unit to the semicoke entering the waste heat recovery cavity 3 is 1: 0.8;
(2.2) the waste heat after the gasification reaction is absorbed by deoxygenated water in a jacket steam cavity 6 of the gasification unit, the generated medium-pressure water vapor is used as a gasification agent and is mixed with oxygen and then is conveyed to a waste heat recovery cavity 3, high-temperature coal gas generated after the gasification reaction is led out from bottom to top and then enters the bottom of a pyrolysis cavity 2 of the vertical pyrolysis unit, the high-temperature coal gas is uniformly distributed at the bottom of the pyrolysis cavity 2 through a gas distributor 21 and is in countercurrent contact with seed coal or semicoke in the flowing process from bottom to top to provide required energy for pyrolysis of the seed coal, combustion reaction does not occur, the pyrolysis reaction in the step (1) is completed, the pyrolysis environment is improved, the yield of tar and pyrolysis gas can be increased, and the yield of the tar can be increased to more than 120% of the yield of coal bronze;
(2.3) the semicoke entering the waste heat recovery cavity 3 exchanges heat longitudinally with the medium-pressure steam generated by the jacket steam cavity 6 to pre-cool the semicoke to about 400 ℃, and the medium-pressure steam exchanges heat and is heated to about 400 ℃ and then is output from the high-temperature medium outlet and conveyed into the gasification reactor 5 of the gasification unit through a pipeline to participate in gasification reaction as a gasification agent, so that the heat is fully exerted, and the process is repeated.
(2.4) the pre-cooled semicoke enters the cooling cavity 4 to exchange heat with desalted water and then is cooled, sent into an interlocking gas locking device through a coke pusher 41 scraper plate and discharged.
Table 1 shows the industrial analysis of the raw material seed coal
TABLE 2 Industrial analysis of semicoke in this example
| Detecting the index | Moisture Mad | Ash content Ad | Volatile component Vdaf | Fixed carbon FCad |
| Test results (%) | 0.5 | 9.1 | 4.9 | 82 |
Table 3 shows the analysis of the gas composition in this example
As can be seen from the analysis of the above tables 1 and 2, the semicoke produced by the method of the present embodiment has the volatile component as low as 4.9%, the semicoke ash content is 9.1%, the indexes are all superior to those of the conventional internal combustion type vertical furnace semicoke, and the semicoke belongs to high-quality clean coal, and the effective component (H) of the coal gas2+CO+CH4) Reaches 80.46 percent, and has better index than the coal gas (about 40 percent of effective components) produced by the conventional internal combustion type vertical furnace.
Example 2
The gasification and pyrolysis coupling apparatus of the present embodiment is different from that of embodiment 1 in that:
the cavity height of the pyrolysis cavity 2 is 3500mm, the cavity height of the waste heat recovery cavity 3 is 1500mm, the side wall of the inner cavity of the waste heat recovery cavity 3 is provided with vertically arranged heat exchange tubes 31, the horizontal distance between the heat exchange tubes 31 is 80mm, and every two adjacent rows of heat exchange tubes are connected by a plate; the row pitch was 150mm, and the other parts were the same as in example 1.
In this embodiment, the specific method for the coal gasification pyrolysis of the seed coal is as follows:
(1) seed coal of 6-80mm raw material enters a vertical pyrolysis unit under the action of gravity, the seed coal is subjected to countercurrent heat exchange with high-temperature coal gas of 800 ℃ generated by a gasification unit in a pyrolysis cavity 2 of the vertical pyrolysis unit, the temperature is gradually increased to 500 ℃ for pyrolysis reaction, and the generated raw coal gas is discharged together with the gasified coal gas through a gas collection cavity 1;
(2) part of the pyrolyzed semicoke directly enters the gasification unit under the action of gravity, and is subjected to gasification reaction with a gasification agent introduced into the bottom of the gasification unit, and high-temperature coal gas generated after the reaction is led out from the gasification unit and then enters a pyrolysis cavity 2 of the vertical pyrolysis unit for pyrolysis reaction; the other part semicoke directly gets into waste heat recovery chamber 3, and at 3 upper portions in waste heat recovery chamber and gasification unit exhaust gas agent heat transfer, lower part and desalinized water heat transfer, discharge after making the semicoke cooling, and the gasification agent heats up the back and returns gasification unit retrieval and utilization, specifically is:
(2.1) directly feeding a part of the pyrolyzed semicoke into a gasification unit under the action of gravity to perform gasification reaction with a gasification agent introduced into the bottom, and directly feeding the other part of the pyrolyzed semicoke into a waste heat recovery cavity 3; the flow ratio of the semicoke entering the gasification unit to the semicoke entering the waste heat recovery cavity 3 is 1: 0.5;
(2.2) absorbing the residual heat after the gasification reaction by deoxygenated water in a jacket steam cavity 6 of the gasification unit, mixing the generated medium-pressure water vapor serving as a gasification agent with oxygen, and then conveying the mixture to a residual heat recovery cavity 3, guiding high-temperature coal gas generated after the gasification reaction out from bottom to top, then entering the bottom of a pyrolysis cavity 2 of the vertical pyrolysis unit, uniformly distributing the mixture at the bottom of the pyrolysis cavity 2 through a gas distributor 21, and making the mixture in countercurrent contact with seed coal or semicoke in the flowing process from bottom to top to provide required energy for pyrolysis of the seed coal without combustion reaction, thereby completing the pyrolysis reaction in the step (1), improving the pyrolysis environment, increasing the yield of tar and pyrolysis gas, and increasing the yield of the tar to more than 150% of the yield of coal bronze;
(2.3) the semicoke entering the waste heat recovery cavity 3 exchanges heat with the medium-pressure steam generated by the jacket steam cavity 6 longitudinally to pre-cool the semicoke to 300 ℃, and the medium-pressure steam is output from the high-temperature medium outlet after the temperature is raised to 300 ℃ through heat exchange and is conveyed into the gasification reactor 5 of the gasification unit through a pipeline to participate in gasification reaction as a gasification agent, so that the heat is fully exerted, and the process is circulated.
(2.4) the pre-cooled semicoke enters the cooling cavity 4 to exchange heat with desalted water and then is cooled, sent into an interlocking gas locking device through a coke pusher 41 scraper plate and discharged.
Example 3
The structure of the vertical gasification and pyrolysis coupling device of the present embodiment is different from that of embodiment 1 in that:
the cavity height of the pyrolysis cavity 2 is 8000mm, the cavity height of the waste heat recovery cavity 3 is 3000mm, the side wall of the inner cavity of the waste heat recovery cavity 3 is provided with vertically arranged heat exchange tubes 31, the horizontal distance between the heat exchange tubes 31 is 30mm, and every two adjacent rows of heat exchange tubes are connected through a plate; the row pitch was 200mm, and the other parts were the same as in example 1.
In this embodiment, the specific method and detection result for the coal gasification pyrolysis of the seeds are as follows:
(1) seed coal of 6-80mm raw material enters a vertical pyrolysis unit under the action of gravity, the seed coal is subjected to countercurrent heat exchange with high-temperature coal gas of 1200 ℃ generated by a gasification unit in a pyrolysis cavity 2 of the vertical pyrolysis unit, the temperature is gradually increased to 800 ℃ for pyrolysis reaction, and the generated raw coal gas is discharged through a gas collection cavity 1 along with the gasified coal gas;
(2) part of the pyrolyzed semicoke directly enters the gasification unit under the action of gravity, and is subjected to gasification reaction with a gasification agent introduced into the bottom of the gasification unit, and high-temperature coal gas generated after the reaction is led out from the gasification unit and then enters a pyrolysis cavity 2 of the vertical pyrolysis unit for pyrolysis reaction; the other part semicoke directly gets into waste heat recovery chamber 3, and at 3 upper portions in waste heat recovery chamber and gasification unit exhaust gas agent heat transfer, lower part and desalinized water heat transfer, discharge after making the semicoke cooling, and the gasification agent heats up the back and returns gasification unit retrieval and utilization, specifically is:
(2.1) directly feeding a part of the pyrolyzed semicoke into a gasification unit under the action of gravity to perform gasification reaction with a gasification agent introduced into the bottom, and directly feeding the other part of the pyrolyzed semicoke into a waste heat recovery cavity 3; the flow ratio of the semicoke entering the gasification unit to the semicoke entering the waste heat recovery cavity 3 is 1: 1;
(2.2) absorbing the residual heat after the gasification reaction by deoxygenated water in a jacket steam cavity 6 of the gasification unit, mixing the generated medium-pressure water vapor serving as a gasification agent with oxygen, and then conveying the mixture to a residual heat recovery cavity 3, guiding high-temperature coal gas generated after the gasification reaction out from bottom to top, then entering the bottom of a pyrolysis cavity 2 of the vertical pyrolysis unit, uniformly distributing the mixture at the bottom of the pyrolysis cavity 2 through a gas distributor 21, and making the mixture in countercurrent contact with seed coal or semicoke in the flowing process from bottom to top to provide required energy for pyrolysis of the seed coal without combustion reaction, thereby completing the pyrolysis reaction in the step (1), improving the pyrolysis environment, increasing the yield of tar and pyrolysis gas, and increasing the yield of the tar to more than 150% of the yield of coal bronze;
(2.3) the semicoke entering the waste heat recovery cavity 3 exchanges heat with the medium-pressure steam generated by the jacket steam cavity 6 longitudinally to pre-cool the semicoke to 450 ℃, and the medium-pressure steam is output from the high-temperature medium outlet after the temperature is raised to 450 ℃ and is conveyed into the gasification reactor 5 of the gasification unit through a pipeline to participate in gasification reaction as a gasification agent, so that the heat is fully exerted, and the process is circulated.
(2.4) the pre-cooled semicoke enters the cooling cavity 4 to exchange heat with desalted water and then is cooled, sent into an interlocking gas locking device through a coke pusher 41 scraper plate and discharged.
The application provides a gasification and pyrolysis coupling method, which mainly couples pyrolysis and gasification, wherein a part of semicoke directly enters a gasification unit for gasification, so that a vertical pyrolysis unit and a semicoke gasification unit are coupled together, sensible heat of high-temperature coal gas generated by gasification of the semicoke in the gasification unit is utilized to provide required energy for coal pyrolysis of the vertical pyrolysis unit, coal is converted into high-quality medium-low temperature coal tar and coal gas in the vertical pyrolysis unit, graded conversion and optimized integration of pulverized coal pyrolysis and semicoke gasification are realized, and high-quality coal tar is enriched; and part of semicoke generated in the pyrolysis process directly enters the gasification area to be gasified, so that the coupling of materials and energy in the pyrolysis process and the gasification process is realized. Meanwhile, heat exchange is carried out between the semi-coke and the gasifying agent before cooling, sensible heat of high-temperature semi-coke is recycled, the charging temperature of the gasifying agent is increased, and the heat energy utilization rate is effectively increased.
Claims (8)
1. A gasification and pyrolysis coupling device is characterized by comprising a vertical pyrolysis unit and a gasification unit communicated with the vertical pyrolysis unit;
the vertical pyrolysis unit comprises a furnace body, wherein the furnace body is divided into a gas collection cavity (1), a pyrolysis cavity (2), a waste heat recovery cavity (3) and a cooling cavity (4) from top to bottom; a coal gas inlet and a high-temperature semicoke outlet are formed in the pyrolysis cavity (2); a high-temperature semicoke outlet is formed in the lower side of the pyrolysis cavity (2), and is communicated with a feed inlet of the gasification unit; a high-temperature medium outlet of the waste heat recovery cavity (3) is communicated with a gasification agent inlet of the gasification unit; the coal gas inlet of the pyrolysis cavity (2) is communicated with the coal gas outlet of the gasification unit, so that one part of semicoke generated by pyrolysis of the pyrolysis cavity (2) is used as a reaction raw material for generating high-temperature coal gas by the gasification unit to participate in gasification reaction, and the other part of semicoke is subjected to countercurrent heat exchange with a gasification agent of the gasification unit in the waste heat recovery cavity (3).
2. The gasification and pyrolysis coupling device according to claim 1, wherein the gasification unit comprises a gasification reactor (5), a slag discharge mechanism (7) arranged at the bottom of an inner cavity of the gasification reactor (5) and a jacket steam cavity (6) arranged at the outer side of the bottom end of the gasification reactor (5), a gasification agent inlet is arranged at the bottom of the gasification reactor (5), and the slag discharge mechanism (7) is arranged right above the gasification agent inlet so that ash generated in the gasification reaction is discharged from the outer side of the gasification agent inlet through the slag discharge mechanism (7); a steam outlet is formed in the jacket steam cavity (6) and communicated with a mixed gas inlet of the waste heat recovery cavity (3) through a pipeline; the upper part of the gasification reactor (5) is provided with a coal gas outlet which is communicated with a coal gas inlet of the pyrolysis cavity (2) through a pipeline.
3. A gasification and pyrolysis coupling according to claim 1 wherein the gasification unit further comprises an ash surge bin (8), the inlet of the ash surge bin (8) being in communication with a slag discharge of a slag discharge mechanism (7).
4. The gasification and pyrolysis coupling device according to any one of claims 1 to 3, wherein the waste heat recovery cavity (3) is internally provided with vertically arranged heat exchange tubes (31), the horizontal spacing of the heat exchange tubes (31) is 30-80mm, and every two adjacent heat exchange tubes are connected by a plate; the distance between the rows is 150-300 mm.
5. A gasification and pyrolysis coupling device according to claim 4, wherein a coke pusher (41) is arranged below the cooling chamber (4) of the vertical pyrolysis unit, and an air lock is arranged at the semi-coke outlet end of the coke pusher (41).
6. A gasification pyrolysis method implemented by using the gasification and pyrolysis coupling device of claim 1, comprising the steps of:
(1) seed coal of 6-80mm raw material enters a vertical pyrolysis unit under the action of gravity, the seed coal is subjected to countercurrent heat exchange with high-temperature coal gas of 800-1200 ℃ generated by a gasification unit in a pyrolysis cavity (2) of the vertical pyrolysis unit, the temperature is gradually increased to 500-800 ℃ for pyrolysis reaction, and the generated raw coal gas is discharged through a gas collection cavity 1 along with the gasified coal gas;
(2) one part of the pyrolyzed semicoke directly enters the gasification unit under the action of gravity, and is subjected to gasification reaction with a gasification agent introduced into the bottom of the gasification unit, and high-temperature coal gas generated after the reaction is led out of the gasification unit and then enters a pyrolysis cavity (2) of the vertical pyrolysis unit for pyrolysis reaction; the other part of the semicoke directly enters the waste heat recovery cavity (3), the waste heat recovery cavity (3) exchanges heat with the water vapor discharged by the gasification unit, the semicoke is cooled and then discharged, and the water vapor is heated to 300-450 ℃ and then returns to the gasification unit to be reused as a gasification agent.
7. The gasification pyrolysis method of claim 6, wherein the step (2) is specifically:
(2.1) directly feeding one part of the pyrolyzed semicoke at 500-700 ℃ into a gasification unit under the action of gravity, carrying out gasification reaction with a gasification agent introduced into the bottom, and directly feeding the other part of the pyrolyzed semicoke into a waste heat recovery cavity (3); the flow ratio of the semicoke entering the gasification unit to the semicoke entering the waste heat recovery cavity (3) is 1: 0.5 to 1;
(2.2) absorbing the residual heat after the gasification reaction by the deoxygenated water in a jacket steam cavity (6) of the gasification unit, conveying the generated medium-pressure water steam to a residual heat recovery cavity (3), guiding out high-temperature coal gas generated after the gasification reaction from bottom to top, then entering the bottom of a pyrolysis cavity (2) of the vertical pyrolysis unit, uniformly distributing the high-temperature coal gas at the bottom of the pyrolysis cavity (2) through a gas distributor (21), and carrying out countercurrent contact with seed coal in the process of flowing from bottom to top to finish the pyrolysis reaction in the step (1);
(2.3) the semicoke entering the waste heat recovery cavity (3) exchanges heat with medium-pressure water vapor generated by the jacket steam cavity (6) to pre-cool the semicoke, and the medium-pressure water vapor is output from a high-temperature medium outlet after being heated through heat exchange and then is conveyed into a gasification reactor (5) of a gasification unit through a pipeline to participate in gasification reaction as a gasification agent, and the process is circulated;
and (2.4) the pre-cooled semicoke enters the cooling cavity (4) to be cooled and then is discharged.
8. A gasification pyrolysis process according to claim 7, wherein step (2.3) is in particular:
the semicoke entering the waste heat recovery cavity (3) and medium-pressure steam generated by the jacket steam cavity (6) perform longitudinal heat exchange to pre-cool the semicoke to 300-450 ℃, and the medium-pressure steam is output from the high-temperature medium outlet and conveyed into a gasification reactor (5) of the gasification unit through a pipeline after the medium-pressure steam is heated to 300-450 ℃ to participate in gasification reaction as a gasification agent, and the process is circulated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010322906.0A CN111394137A (en) | 2020-04-22 | 2020-04-22 | Gasification and pyrolysis coupling device and gasification and pyrolysis method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010322906.0A CN111394137A (en) | 2020-04-22 | 2020-04-22 | Gasification and pyrolysis coupling device and gasification and pyrolysis method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111394137A true CN111394137A (en) | 2020-07-10 |
Family
ID=71437224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010322906.0A Pending CN111394137A (en) | 2020-04-22 | 2020-04-22 | Gasification and pyrolysis coupling device and gasification and pyrolysis method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111394137A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114395427A (en) * | 2022-01-20 | 2022-04-26 | 陕西凯德利能源科技有限公司 | Coal gasification pyrolysis coupled vertical pyrolysis furnace pyrolysis and drying system and method |
-
2020
- 2020-04-22 CN CN202010322906.0A patent/CN111394137A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114395427A (en) * | 2022-01-20 | 2022-04-26 | 陕西凯德利能源科技有限公司 | Coal gasification pyrolysis coupled vertical pyrolysis furnace pyrolysis and drying system and method |
| CN114395427B (en) * | 2022-01-20 | 2023-09-19 | 陕西凯德利能源科技有限公司 | Coal gasification pyrolysis coupled pyrolysis and drying system and method of vertical pyrolysis furnace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2011325794B2 (en) | Apparatus and method for multi-stage pyrolysis and gasification of solid fuel | |
| CN110591745B (en) | Pyrolysis-gasification integrated device and process | |
| CN106701202A (en) | Apparatus and method used for mixing reaction of synthetic gas and coal and gas-solid-liquid grading separation of product | |
| CN109652103B (en) | Down bed-fixed bed pyrolysis-gasification integrated method and device | |
| CN206033677U (en) | Powder coal carbonization device | |
| CN105087078A (en) | Indirect pyrolysis system and pyrolysis method thereof | |
| CN107723031B (en) | Pulverized coal high-pressure gasification pyrolysis integrated device | |
| CN111394137A (en) | Gasification and pyrolysis coupling device and gasification and pyrolysis method | |
| CN103980920A (en) | Low-quality fuel pyrolysis process | |
| CN106947541B (en) | Combined method and system for hydrogen production based on low-rank coal pyrolysis water vapor coke quenching water gas | |
| CN206266493U (en) | The system that a kind of coal is classified dual treatment | |
| CN212076968U (en) | Gasification and pyrolysis coupling device | |
| CN107325832A (en) | A kind of system and method for step-by-step processing lignite | |
| CN217173631U (en) | Pulverized coal hydrogasification and biomass pyrolysis coupling device | |
| CN210711404U (en) | Pyrolysis-gasification integrated device | |
| CN106495157A (en) | The recycling system of semicoke heat and recoverying and utilizing method | |
| CN203947067U (en) | A kind of novel controlled environmental protection and energy saving coke quenching auxiliary | |
| CN208748019U (en) | Heat accumulating type hydrogen-rich gas heat carrier moving bed pyrolysis system | |
| CN109652146B (en) | Downer bed-turbulent bubbling bed pyrolysis-gasification integrated method and device | |
| CN208087556U (en) | A kind of high-pressure gasified thermal decomposition integrated makeup of fine coal is set | |
| CN204589098U (en) | Utilize the pyrolysis of coal system of spouted bed bioreactor | |
| CN113278437A (en) | Rising temperature sudden-falling type double-pyrolysis-section internal heating type moving bed coal vertical pyrolysis furnace | |
| CN203474733U (en) | Clinker gasifying furnace of pressurizing fixed bed | |
| CN111054273B (en) | Moving bed pyrolysis apparatus and method | |
| CN115109606B (en) | Pure hydrogen and poly-generation coupling system prepared from biomass waste |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |