CN110846079B - Solar-driven lignite poly-generation upgrading system and operation method - Google Patents

Solar-driven lignite poly-generation upgrading system and operation method Download PDF

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CN110846079B
CN110846079B CN201911138759.5A CN201911138759A CN110846079B CN 110846079 B CN110846079 B CN 110846079B CN 201911138759 A CN201911138759 A CN 201911138759A CN 110846079 B CN110846079 B CN 110846079B
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gas
pyrolysis
heat
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tower
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CN110846079A (en
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严俊杰
刘荣堂
刘明
严卉
徐灿
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Xian Jiaotong University
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Xian Jiaotong University
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/58Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
    • C10J3/60Processes
    • C10J3/64Processes with decomposition of the distillation products
    • C10J3/66Processes with decomposition of the distillation products by introducing them into the gasification zone
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/58Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
    • C10J3/60Processes
    • C10J3/62Processes with separate withdrawal of the distillation products
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72Other features
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/09Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0903Feed preparation
    • C10J2300/0909Drying
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/09Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913Carbonaceous raw material
    • C10J2300/093Coal
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/09Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953Gasifying agents
    • C10J2300/0973Water
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/09Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953Gasifying agents
    • C10J2300/0973Water
    • C10J2300/0976Water as steam
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00Details of gasification processes
    • C10J2300/12Heating the gasifier
    • C10J2300/1284Heating the gasifier by renewable energy, e.g. solar energy, photovoltaic cells, wind
    • C10J2300/1292Heating the gasifier by renewable energy, e.g. solar energy, photovoltaic cells, wind mSolar energy
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/129Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/133Renewable energy sources, e.g. sunlight

Abstract

A solar-driven lignite poly-generation upgrading system and an operation method thereof are disclosed, wherein the system comprises a dryer, a pyrolysis furnace, a solar gasifier, a drying heat exchanger, a synthesis gas cooling purifier and a synthesis gas storage tank which are sequentially communicated, and further comprises a waste heat recoverer, a gas-liquid separator, a pyrolysis gas cooling purifier and a pyrolysis gas storage tank which are sequentially communicated; solar energy is focused by the tower type solar reflector field to be used as a heat source of the tower type solar gasifier, so that the temperature of the tower type solar gasifier is kept constant at an optimal value; the high-temperature synthesis gas generated in the solar gasifier is used as a heat source of the pyrolysis furnace, the medium-temperature synthesis gas and the pyrolysis mixed gas at the outlet of the pyrolysis furnace are used as heat sources of the drying machine, the temperature of the pyrolysis furnace and the temperature of the drying machine are guaranteed to be stabilized at the optimal value by adjusting each gas valve, and the flow of water and exhaust steam entering the tower-type solar gasifier are adjusted by each exhaust steam adjusting valve, wherein the aim is as follows: the water-semicoke ratio in the tower type solar gasifier is kept at the optimal value. The invention realizes the poly-generation and the energy gradient utilization of oil and gas, and is clean and efficient.

Description

Solar-driven lignite poly-generation upgrading system and operation method
Technical Field
The invention relates to the technical field of lignite drying, pyrolysis and gasification, in particular to a solar-driven lignite poly-generation upgrading system and an operation method.
Background
Fossil fuel mainly containing coal plays a leading role in energy structure in China, and the reserves of lignite in China are large and are proved to exceed 1300 hundred million tons. Lignite is mineral coal with the lowest coalification degree, and the characteristics of high volatile content, high moisture content, high ash content and low calorific value cause low power generation efficiency and heavy pollution of direct combustion of lignite; therefore, the efficient clean utilization of the lignite is a key technology. The lignite drying, pyrolyzing and gasifying technology is an effective means for improving the utilization efficiency of lignite. But the existing single lignite drying, pyrolysis or gasification technology faces the difficult problem of waste steam, volatile gas and phenol water energy and quality recovery; meanwhile, the heat source for lignite pyrolysis or gasification is derived from partial semicoke generated by direct combustion, or pyrolysis gas generated by direct combustion, and the like, so that a large amount of high-grade heat is wasted, and the principle of energy gradient utilization is not met; in summary, the lignite upgrading process for realizing lignite drying, pyrolysis and gasification needs to solve the following problems:
(1) near zero emission in the lignite drying, pyrolysis and gasification processes is realized as much as possible, a novel system for reasonably and efficiently comprehensively utilizing lignite is constructed, the waste heat of the system is reasonably recovered, and the efficient and clean lignite poly-generation upgrading technology is realized;
(2) the method realizes that clean and renewable energy sources are used as heat sources in the drying, pyrolysis and gasification processes, and ensures the stability of the temperature of the heat sources and the gradient utilization of the energy.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a solar-driven lignite poly-generation upgrading system and an operation method thereof, wherein raw lignite in the system is dried and then enters a pyrolysis furnace, mixed gas and semicoke are generated by pyrolysis, the semicoke is put into a solar gasifier, water vapor generated in the drying process and phenol water generated in the pyrolysis process are used as gasifying agents to completely gasify the semicoke, and tar, pyrolysis gas and synthesis gas generated in the pyrolysis process are cooled, purified and then recovered to be used as product fuel; the gasification process adopts solar energy as a heat source, the pyrolysis process adopts high-temperature synthesis gas generated in the gasification process as the heat source, and the drying process adopts heat released by cooling mixed gas in the pyrolysis process and medium-temperature synthesis gas at an outlet of a pyrolysis furnace as the heat source. The invention realizes the poly-generation of oil gas and the cascade utilization of energy, and the lignite upgrading process is efficient and clean.
In order to achieve the purpose, the invention adopts the following technical scheme:
a solar-driven lignite poly-generation upgrading system comprises a dryer 101, a pyrolysis chamber of a pyrolysis furnace 110, a tower-type solar gasifier 123, a gas valve A124, a heat source pipe cavity of the pyrolysis furnace 110, a fan 109, a gas valve B126, a right cavity of a heat medium circulation area of a drying heat exchanger 105, a synthetic gas cooling purifier 106 and a synthetic gas storage tank 107, wherein the pyrolysis chamber of the pyrolysis furnace 110 is communicated with a product outlet of the dryer 101; the method is characterized in that: a gas product outlet of the pyrolysis furnace 110, a heat medium circulation area of the waste heat recoverer 111, a gas-liquid separator 112, a pyrolysis gas cooling purifier 115 and a pyrolysis gas storage tank 118 form a pyrolysis gas recovery branch; the gas-liquid separator 112 is sequentially communicated with an oil-water separator 113, a tar cooling purifier 119 and a tar storage tank 120; the phenol water outlet of the oil-water separator 113 is sequentially communicated with the phenol water pump 114, the phenol water valve A116 and the phenol water inlet of the tower-type solar gasifier 123; the phenol water pump 114 is sequentially communicated with a phenol water valve B117 and the external environment; a heat source pipeline of the dryer 101 is sequentially communicated with a drying water pump 104 and a cold medium circulation area of a drying heat exchanger 105; the left cavity of the heat medium circulation area of the drying heat exchanger 105 is communicated with the cold medium circulation area of the waste heat recoverer 111 through a pipeline where the waste heat recovery pump 108 is located; a steam exhaust outlet of the dryer 101 is communicated with a steam inlet of the tower-type solar gasifier 123 through a pipeline where a steam exhaust valve A103 is located; a waste steam outlet of the dryer 101 is communicated with the external environment through a pipeline where a waste steam valve B102 is located; the external environment is communicated with the coal feeding inlet of the dryer 101 through the original lignite pipeline; the gas product outlet of the tower type solar gasifier 123 is communicated with the fan 109, the pipeline of the gas valve D127 and the synthesis gas cooling purifier 106 through the pipeline of the gas valve C125; an ash discharge outlet of the tower-type solar gasifier 123 is communicated with the external environment through an ash discharge pipeline; an impurity outlet of the syngas cooling purifier 106 is in communication with the outside environment via an impurity conduit a; an impurity outlet of the pyrolysis gas cooling purifier 115 is communicated with the external environment through an impurity pipeline B; an impurity outlet of the tar cooling purifier 119 is communicated with the external environment through an impurity pipeline C; the system also includes a tower solar reflector field 121 and a condenser 122 optically connected to the tower solar vaporizer 123.
Raw lignite is dried and dehydrated in a dryer 101 to form dried lignite, the dried lignite is pyrolyzed in a pyrolyzing furnace 110 to generate semicoke and mixed gas, the semicoke and the mixed gas enter a tower type solar gasifier 123 to be gasified, and the gasifying agent adopts exhausted steam dried by the dryer 101 and phenolic water generated by pyrolysis in the pyrolyzing furnace 110; the synthesis gas generated in the tower-type solar gasifier 123 is subjected to heat release and purification through a heat source pipe cavity of the pyrolysis furnace 110, a right cavity of a heat medium flowing area of the drying heat exchanger 105 and the synthesis gas cooling purifier 106, and then is stored in a synthesis gas storage tank 107 as a product; the mixed gas generated in the pyrolysis furnace 110 is divided into two paths after heat release in a heat medium circulation area of the waste heat recoverer 111 and separation by the gas-liquid separator 112: the gas is cooled and purified by a pyrolysis gas cooling purifier 115 and then is stored in a pyrolysis gas storage tank 118 as a product; the liquid is separated into tar and phenol water by an oil-water separator 113, wherein the tar is cooled and purified by a tar cooling purifier 119 and then stored in a tar storage tank 120 as a product, and the phenol water enters a tower type solar gasifier 123 as a gasifying agent.
Lignite is subjected to three upgrading processes of drying, pyrolysis and complete gasification, wherein the pyrolysis and gasification processes have the following heat source conditions: in the complete gasification process, the condensing lens 122 is used for focusing sunlight reflected by the tower type solar reflector field 121 to be used as a heat source of the tower type solar gasifier 123; the pyrolysis process adopts high-temperature synthesis gas generated in the tower-type solar gasifier 123 as a heat source; the heat exchange process is the dividing wall type heat exchange.
The heat source in the drying process is divided into two parts, and the heat released by condensation of the high-temperature mixed gas generated in the pyrolysis furnace 110 is recovered in the waste heat recoverer 111 and is transmitted to the left cavity of the heat medium flowing area of the drying heat exchanger 105 to be used as the first part heat source of the dryer 101; the heat released by the medium-temperature synthesis gas at the outlet of the pyrolysis furnace 110 in the right cavity of the heat medium circulation area of the drying heat exchanger 105 is used as a second part of heat source of the dryer 101. The two parts of heat sources supply heat to the drying process in two stages. The heat exchange process is the dividing wall type heat exchange. The system realizes the cascade utilization of energy by reasonably selecting the heat source in the gasification, pyrolysis and drying processes.
According to the operation method of the solar-driven lignite poly-generation upgrading system, the flow of phenol water entering the tower-type solar gasifier 123 is ensured to be stable by adjusting the phenol water valve A116 and the phenol water valve B117, the flow of steam entering the tower-type solar gasifier 123 is ensured to be stable by adjusting the steam exhaust valve A103 and the steam exhaust valve B102, and meanwhile, the ratio of the mass flow of water to the mass flow of semicoke in the tower-type solar gasifier 123 is ensured to be constant at an optimal value; the gas flow of the high-temperature synthesis gas entering the pyrolysis furnace 110 is ensured to be stabilized at an optimal value by adjusting the gas valve A124 and the gas valve C125; the flow of the medium-temperature synthesis gas entering the drying heat exchanger 105 is ensured to be stabilized at an optimal value by adjusting a gas valve II 126 and a gas valve III 127; the condensing mirror 122 and the tower solar reflector field 121 are adjusted to keep the gasification temperature of the tower solar gasifier 123 at an optimal value.
Compared with the prior art, the invention has the following advantages:
(1) the lignite upgrading system organically combines three lignite upgrading technologies of lignite drying, pyrolysis and gasification, achieves near zero emission of the lignite upgrading system, remarkably improves energy utilization efficiency compared with a single lignite drying, lignite pyrolysis or gasification system, and achieves clean utilization of lignite.
(2) Solar energy is a clean and renewable energy source, and is used as a heat source in the gasification process, so that the problem of unreasonable energy utilization caused by the fact that a burning part of semicoke is used as the heat source is avoided, and the problem of overlarge smoke extraction caused by the fact that high-temperature smoke of a boiler is extracted as the heat source is also avoided.
(3) The dry exhaust steam, the pyrolysis phenol water and the pyrolysis gas are fully recycled, so that the environmental pollution and the energy waste are avoided.
(4) The pyrolysis process adopts high-temperature synthesis gas as a heat source, the drying process adopts mixed gas generated by pyrolysis and medium-temperature synthesis gas at the outlet of the pyrolysis furnace as heat sources, and the gradient utilization of energy is realized.
Drawings
FIG. 1 is a schematic diagram of a solar-powered lignite polygeneration upgrading system and an operation method thereof.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the solar-driven lignite poly-generation upgrading system comprises a dryer 101, a pyrolysis chamber of a pyrolysis furnace 110 communicated with a product outlet of the dryer 101, a tower-type solar gasifier 123, a gas valve a 124, a heat source pipe cavity of the pyrolysis furnace 110, a fan 109, a gas valve b 126, a right cavity of a heat medium circulation area of a drying heat exchanger 105, a syngas cooling purifier 106 and a syngas storage tank 107; the method is characterized in that: a gas product outlet of the pyrolysis furnace 110, a heat medium circulation area of the waste heat recoverer 111, a gas-liquid separator 112, a pyrolysis gas cooling purifier 115 and a pyrolysis gas storage tank 118 form a pyrolysis gas recovery branch; the gas-liquid separator 112 is sequentially communicated with an oil-water separator 113, a tar cooling purifier 119 and a tar storage tank 120; the phenol water outlet of the oil-water separator 113 is sequentially communicated with the phenol water pump 114, the phenol water valve A116 and the phenol water inlet of the tower-type solar gasifier 123; the phenol water pump 114 is sequentially communicated with a phenol water valve B117 and the external environment; a heat source pipeline of the dryer 101 is sequentially communicated with a drying water pump 104 and a cold medium circulation area of a drying heat exchanger 105; the left cavity of the heat medium circulation area of the drying heat exchanger 105 is communicated with the cold medium circulation area of the waste heat recoverer 111 through a pipeline where the waste heat recovery pump 108 is located; a steam exhaust outlet of the dryer 101 is communicated with a steam inlet of the tower-type solar gasifier 123 through a pipeline where a steam exhaust valve A103 is located; a waste steam outlet of the dryer 101 is communicated with the external environment through a pipeline where a waste steam valve B102 is located; the external environment is communicated with the coal feeding inlet of the dryer 101 through the original lignite pipeline; the gas product outlet of the tower type solar gasifier 123 is communicated with the fan 109, the pipeline of the gas valve D127 and the synthesis gas cooling purifier 106 through the pipeline of the gas valve C125; an ash discharge outlet of the tower-type solar gasifier 123 is communicated with the external environment through an ash discharge pipeline; an impurity outlet of the syngas cooling purifier 106 is in communication with the outside environment via an impurity conduit a; an impurity outlet of the pyrolysis gas cooling purifier 115 is communicated with the external environment through an impurity pipeline B; an impurity outlet of the tar cooling purifier 119 is communicated with the external environment through an impurity pipeline C; the system also includes a tower solar reflector field 121 and a condenser 122 optically connected to the tower solar vaporizer 123.
As a preferred embodiment of the present invention, raw lignite is dried and dehydrated in the dryer 101 to become dried lignite, the dried lignite is pyrolyzed in the pyrolysis furnace 110 to generate semicoke and mixed gas, the semicoke and the mixed gas enter the tower type solar gasifier 123 for gasification, and the gasification agent adopts the exhaust steam dried by the dryer 101 and phenolic water generated by pyrolysis in the pyrolysis furnace 110; the synthesis gas generated in the tower-type solar gasifier 123 is subjected to heat release and purification through a heat source pipe cavity of the pyrolysis furnace 110, a right cavity of a heat medium flowing area of the drying heat exchanger 105 and the synthesis gas cooling purifier 106, and then is stored in a synthesis gas storage tank 107 as a product; the mixed gas generated in the pyrolysis furnace 110 is divided into two paths after heat release in a heat medium circulation area of the waste heat recoverer 111 and separation by the gas-liquid separator 112: the gas is cooled and purified by a pyrolysis gas cooling purifier 115 and then is stored in a pyrolysis gas storage tank 118 as a product; the liquid is separated into tar and phenol water by an oil-water separator 113, wherein the tar is cooled and purified by a tar cooling purifier 119 and then stored in a tar storage tank 120 as a product, and the phenol water enters a tower type solar gasifier 123 as a gasifying agent.
As a preferred embodiment of the invention, lignite is subjected to three upgrading processes of drying, pyrolysis and complete gasification, wherein the pyrolysis and gasification process heat source conditions are as follows: in the complete gasification process, the condensing lens 122 is used for focusing sunlight reflected by the tower type solar reflector field 121 to be used as a heat source of the tower type solar gasifier 123; the pyrolysis process adopts high-temperature synthesis gas generated in the tower-type solar gasifier 123 as a heat source; the heat exchange process is the dividing wall type heat exchange.
As a preferred embodiment of the present invention, the heat source in the drying process is divided into two parts, and the heat released by the condensation of the high-temperature mixed gas generated in the pyrolysis furnace 110 is recovered in the waste heat recoverer 111 and transferred to the left cavity of the heat medium flowing region of the drying heat exchanger 105 as the first part of the heat source of the dryer 101; the heat released by the medium-temperature synthesis gas at the outlet of the pyrolysis furnace 110 in the right cavity of the heat medium circulation area of the drying heat exchanger 105 is used as a second part of heat source of the dryer 101. The two parts of heat sources supply heat to the drying process in two stages. The heat exchange process is the dividing wall type heat exchange. The system realizes the cascade utilization of energy by reasonably selecting the heat source in the gasification, pyrolysis and drying processes.
As shown in fig. 1, the invention relates to an operation method of a solar-driven lignite poly-generation upgrading system, which comprises the following steps: the flow of the phenol water entering the tower type solar gasifier 123 is ensured to be stable by adjusting the phenol water valve A116 and the phenol water valve B117, the flow of the steam entering the tower type solar gasifier 123 is ensured to be stable by adjusting the steam exhaust valve A103 and the steam exhaust valve B102, and meanwhile, the mass flow ratio of the water to the semicoke in the tower type solar gasifier 123 is ensured to be constant at an optimal value; the gas flow of the high-temperature synthesis gas entering the pyrolysis furnace 110 is ensured to be stabilized at an optimal value by adjusting the gas valve A124 and the gas valve C125; the flow of the medium-temperature synthesis gas entering the drying heat exchanger 105 is ensured to be stabilized at an optimal value by adjusting a gas valve II 126 and a gas valve III 127; the condensing mirror 122 and the tower solar reflector field 121 are adjusted to keep the gasification temperature of the tower solar gasifier 123 at an optimal value.

Claims (5)

1. A solar-driven lignite poly-generation upgrading system comprises a dryer (101), a pyrolysis chamber of a pyrolysis furnace (110), a tower-type solar gasifier (123), a gas valve A (124), a heat source pipe cavity of the pyrolysis furnace (110), a fan (109), a gas valve B (126), a right cavity of a heat medium circulation area of a drying heat exchanger (105), a synthetic gas cooling purifier (106) and a synthetic gas storage tank (107), wherein the pyrolysis chamber of the pyrolysis furnace (110) is communicated with a product outlet of the dryer (101); the method is characterized in that: a gas product outlet of the pyrolysis furnace (110) sequentially forms a pyrolysis gas recovery branch with a heat medium circulation area of the waste heat recoverer (111), a gas-liquid separator (112), a pyrolysis gas cooling purifier (115) and a pyrolysis gas storage tank (118); the gas-liquid separator (112) is communicated with the oil-water separator (113), the tar cooling purifier (119) and the tar storage tank (120) in sequence; a phenol water outlet of the oil-water separator (113) is sequentially communicated with a phenol water pump (114), a phenol water valve A (116) and a phenol water inlet of the tower-type solar gasifier (123); the phenol water pump (114) is sequentially communicated with a phenol water valve B (117) and the external environment; a heat source pipeline of the dryer (101) is sequentially communicated with a drying water pump (104) and a cold medium circulation area of a drying heat exchanger (105); the left cavity of the heat medium circulation area of the drying heat exchanger (105) is communicated with the cold medium circulation area of the waste heat recoverer (111) through a pipeline where a waste heat recovery pump (108) is located; a waste steam outlet of the dryer (101) is communicated with a steam inlet of the tower-type solar gasifier (123) through a pipeline where a waste steam valve A (103) is located; a waste steam outlet of the dryer (101) is communicated with the external environment through a pipeline where a waste steam valve B (102) is located; the external environment is communicated with a coal feeding inlet of the dryer (101) through an original lignite pipeline; a gas product outlet of the tower type solar gasifier (123) is communicated with a fan (109), a pipeline of a gas valve D (127) and a synthesis gas cooling purifier (106) through a pipeline of the gas valve C (125); an ash discharge outlet of the tower type solar gasifier (123) is communicated with the external environment through an ash discharge pipeline; an impurity outlet of the syngas cooling purifier (106) is communicated with the external environment through an impurity pipeline A; an impurity outlet of the pyrolysis gas cooling purifier (115) is communicated with the external environment through an impurity pipeline B; an impurity outlet of the tar cooling purifier (119) is communicated with the external environment through an impurity pipeline C; the system also comprises a tower solar reflector field (121) and a condenser (122) which are connected with the tower solar gasifier (123) through an optical path.
2. The solar-powered lignite polygeneration upgrading system according to claim 1, characterized in that: raw lignite is dried and dehydrated in a dryer (101) to be dried lignite, the dried lignite is pyrolyzed in a pyrolyzing furnace (110) to generate semicoke and mixed gas, the semicoke and the mixed gas enter a tower type solar gasifier (123) to be gasified, and the gasifying agent adopts exhausted steam dried by the dryer (101) and phenolic water generated by pyrolysis in the pyrolyzing furnace (110); the synthesis gas generated in the tower type solar gasifier (123) is subjected to heat release and purification through a heat source pipe cavity of the pyrolysis furnace (110), a right cavity of a heat medium flowing area of the drying heat exchanger (105) and the synthesis gas cooling purifier (106), and then is stored in a synthesis gas storage tank (107) as a product; mixed gas generated in the pyrolysis furnace (110) is subjected to heat release in a heat medium flowing area of a waste heat recoverer (111) and is separated by a gas-liquid separator (112), and then the mixed gas is divided into two paths: the gas is cooled and purified by a pyrolysis gas cooling purifier (115) and then is stored in a pyrolysis gas storage tank (118) as a product; the liquid is separated into tar and phenol water through an oil-water separator (113), wherein the tar is cooled and purified through a tar cooling purifier (119) and then stored in a tar storage tank (120) as a product, and the phenol water enters a tower type solar gasifier (123) as a gasifying agent.
3. The solar-powered lignite polygeneration upgrading system according to claim 1, characterized in that: lignite is subjected to three upgrading processes of drying, pyrolysis and complete gasification, wherein the pyrolysis and gasification processes have the following heat source conditions: in the complete gasification process, a collecting mirror (122) is used for focusing sunlight reflected by a tower type solar reflector field (121) to be used as a heat source of a tower type solar gasifier (123); in the pyrolysis process, high-temperature synthesis gas generated in the tower-type solar gasifier (123) is used as a heat source; the heat exchange process is the dividing wall type heat exchange.
4. The solar-powered lignite polygeneration upgrading system according to claim 1, characterized in that: the heat source in the drying process is divided into two parts, and heat released by condensation of high-temperature mixed gas generated in the pyrolysis furnace (110) is recovered in a waste heat recoverer (111) and is transmitted to a left cavity of a heat medium flowing area of the drying heat exchanger (105) to be used as a first part heat source of the dryer (101); the heat released by the medium-temperature synthesis gas at the outlet of the pyrolysis furnace (110) in the right cavity of the heat medium circulation area of the drying heat exchanger (105) is used as a second part of heat source of the dryer (101); the two parts of heat sources supply heat to the drying process in two stages; the heat exchange process is the dividing wall type heat exchange.
5. The method of operating a solar powered lignite polygeneration upgrading system of any one of claims 1 to 4, wherein: the flow of the phenol water entering the tower type solar gasifier (123) is ensured to be stable by adjusting a phenol water valve A (116) and a phenol water valve B (117), the flow of the steam entering the tower type solar gasifier (123) is ensured to be stable by adjusting a steam exhaust valve A (103) and a steam exhaust valve B (102), and meanwhile, the mass flow ratio of the water to the semicoke in the tower type solar gasifier (123) is ensured to be constant at an optimal value; the gas flow of the high-temperature synthesis gas entering the pyrolysis furnace (110) is ensured to be stabilized at an optimal value by adjusting a gas valve A (124) and a gas valve C (125); the flow of the medium-temperature synthesis gas entering the drying heat exchanger (105) is ensured to be stabilized at an optimal value by adjusting a gas valve B (126) and a gas valve D (127); the gasification temperature of the tower type solar gasifier (123) is kept at an optimal value by adjusting the collecting mirror (122) and the tower type solar reflector field (121).
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