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CN-121976783-A - Coal in-situ gasification and deep processing treatment system and method

CN121976783ACN 121976783 ACN121976783 ACN 121976783ACN-121976783-A

Abstract

The invention provides a coal in-situ gasification and deep processing treatment system and method, and belongs to the technical field of coal development. The coal in-situ gasification and deep processing system comprises an extraction and gasification unit which is arranged from the ground surface to a coal layer, gas to be processed is transmitted to the ground surface through the coal layer, the gas to be processed comprises coal layer gas and synthetic gas, a gas purification unit is used for receiving and purifying the gas to be processed to prepare purified gas, a gas processing unit is used for receiving at least part of the purified gas, and performing steam reforming and purification and separation on hydrogen to prepare refined gas, and the refined gas comprises hydrogen, carbon monoxide and carbon dioxide. According to the invention, through reasonable selection of technical research and optimal design of the process flow, the extraction rate and the utilization rate of coal and gas resources are improved, the high-efficiency and stable hydrogen output is ensured, the industrial chain of in-situ coal gasification is expanded, the added value of the coal resources is increased, and the effects of simple flow, safety, reliability, energy conservation and emission reduction are achieved.

Inventors

  • WANG YI
  • LI MINGLIANG
  • ZOU XIN

Assignees

  • 安徽深地新能资源有限公司

Dates

Publication Date
20260505
Application Date
20251222
Priority Date
20241223

Claims (10)

  1. 1. A coal in situ gasification and advanced processing system, comprising: The extraction and gasification unit (10) is arranged from the ground surface to the coal bed in a penetrating way and is used for preparing gas to be processed, the gas to be processed is transmitted to the ground surface through the coal bed, and the gas to be processed comprises coal bed gas and synthetic gas; A gas purifying unit (20) for receiving and purifying a gas to be processed to produce a purified gas; A gas processing unit (30) for receiving at least a portion of the purge gas and performing steam reforming and purification of the separated hydrogen to produce a finishing gas comprising hydrogen and carbon dioxide; And the carbon capturing and sealing unit (40) is used for capturing carbon dioxide in the finishing gas and collecting and sealing.
  2. 2. The coal in situ gasification and advanced processing system according to claim 1, wherein the extraction and gasification unit (10) comprises: A first injection and production well (110) comprising a first submerged section (111) penetrating from the earth's surface to the coal seam and a first extended section (112) distributed along the coal seam and disposed in communication with the first submerged section; the second injection and production well (120) is at least one of which is distributed side by side with the first injection and production well, and comprises a second submerged section (121) penetrating the coal bed from the surface and a second extending section (122) distributed along the coal bed and communicated with the second submerged section; A communication section (130) disposed within the coal seam for communicating the first extension section (112) and the second extension section (122); and the third injection and production well (140) comprises a third submerged section (141) penetrating from the surface to the coal layer, and one end of the third submerged section, which is placed in the coal layer, is communicated with the communication section (130).
  3. 3. The in-situ coal gasification and deep processing system according to claim 2, wherein a dewatering device (142) is arranged in the third injection well (140), and the dewatering device is used for dewatering coal bed gas to produce purified water, and supplying the purified water to the extraction and gasification unit (10) and the gas processing unit (30).
  4. 4. The coal in-situ gasification and advanced processing treatment system according to claim 1, wherein the gas purification unit (20) comprises a dust removal tower (210) for dust removal of the gas to be processed, a desulfurizing tower (220) for desulfurization of the gas to be processed, and a benzene removal tower (230) for benzene removal of the gas to be processed, which are sequentially connected.
  5. 5. The coal in-situ gasification and advanced processing system according to claim 1, wherein the gas processing unit (30) comprises at least one steam methane reforming sledge (310) and at least one separation and purification hydrogen production device (320), the purified gas is circulated between the steam methane reforming sledge and the separation and purification hydrogen production device until the hydrogen content a in the gas phase product meets a preset value, and then the purified gas is separated from the gas processing unit (30), wherein the preset value of the hydrogen content a is more than or equal to 70%.
  6. 6. The coal in situ gasification and further processing system of any one of claims 1 to 5 further comprising a methane and syngas power generation unit (50) in communication with the gas processing unit (30) and the carbon capture and sequestration unit (40), respectively, for receiving at least a portion of the purge gas for combustion power generation and for delivering combustion products to the carbon capture and sequestration unit (40).
  7. 7. The coal in situ gasification and deep processing system of any one of claims 1-5 further comprising a hydrogen and oxygen production unit (60) comprising a distributed photovoltaic power plant (610) and an electrolyzer (620).
  8. 8. The coal in situ gasification and further processing system of any one of claims 1 to 5 further comprising a green synthesis methanol unit (70) for receiving purge gas from the gas purge unit (20) for methanol synthesis and delivering carbon dioxide to the carbon capture and sequestration unit (40).
  9. 9. The coal in situ gasification and further processing system of any one of claims 1 to 5 further comprising a green ammonia synthesis unit (80) for receiving purified gas from the gas purification unit (20) for ammonia synthesis.
  10. 10. A method for in-situ gasification and deep processing of coal, using the in-situ gasification and deep processing system of coal according to any one of the preceding claims 1-9, characterized in that it comprises the following steps: The coal bed gas processing step comprises the steps of extracting coal bed gas, purifying the coal bed gas, enabling at least part of the coal bed gas to react to generate hydrogen through a steam methane reforming technology, and collecting carbon dioxide through a carbon capturing and sealing unit; and the coal gasification processing step is to make the synthesis gas by utilizing the gasification agent to react with coal for gasification, purify and separate hydrogen in the synthesis gas, then make the synthesis gas react to generate hydrogen through a steam methane reforming technology, and collect carbon dioxide through a carbon capturing and sealing unit.

Description

Coal in-situ gasification and deep processing treatment system and method Technical Field The invention relates to the technical field of coal development, in particular to a coal in-situ gasification and deep processing treatment system and method. Background Coal makes an important contribution to the development of the economic society of China, and in a quite long period in the future, the coal is still a main energy source of China and is limited by the resource distribution characteristics of large coal burial depth and poor resource endowment of China, and the coal resources face a plurality of traditional physical exploitation problems. The traditional physical exploitation of coal can generate pollutants such as coal gangue, coal gas, mine water and the like, and can cause surface subsidence and water and soil loss. In addition, in order to achieve the long-term goal of carbon-to-peak carbon neutralization, the coal mining industry needs to push clean production technology to create favorable conditions for the transition development mode of the coal industry and the realization of clean and efficient development. Wherein, the coal in-situ gasification is a green mining technology, which converts underground coal into combustible gas (synthetic gas) through controllable combustion and then withdraws the ground for use, the technology omits huge mining and transportation links, not only greatly reduces underground engineering and hard operation, but also eliminates the pollution of coal exploitation to the environment and the adverse effect and harm of coal combustion to the ecological environment to a great extent. However, in the prior art, in-situ gasification methods for deep thin coal seams are mostly single gasification research, and the yield and the utilization rate of coal and gas resources are low, so that a system and a method for in-situ gasification and deep processing of coal are needed. Disclosure of Invention The invention provides a coal in-situ gasification and deep processing system and method, which are used for improving the yield and the utilization rate of coal and gas resources through reasonable selection and optimal design of technological processes through technical research, ensuring high-efficiency and stable hydrogen output, expanding the industrial chain of in-situ gasification, increasing the added value of the coal resources and achieving the effects of simple process, safety, reliability, energy conservation and emission reduction. An in situ coal gasification and deep processing system comprising: the extraction and gasification unit is arranged from the ground surface to the coal bed in a penetrating way and is used for preparing gas to be processed, the gas to be processed is transmitted to the ground surface through the coal bed, and the gas to be processed comprises coal bed gas and synthetic gas; the gas purifying unit is used for receiving and purifying the gas to be processed to prepare purified gas; a gas processing unit for receiving at least a portion of the purge gas and performing steam reforming and purification of the separated hydrogen to produce a finished gas comprising hydrogen and carbon dioxide; and the carbon capturing and sealing unit is used for capturing carbon dioxide in the finishing gas and collecting and sealing. Preferably, the extraction and gasification unit comprises: The first injection and production well comprises a first submerged section penetrating through the coal bed from the earth surface and a first extension section distributed along the coal bed and communicated with the first submerged section; the second injection and production well is at least one side-by-side distributed with the first injection and production well, and comprises a second submerged section penetrating through the coal bed from the ground surface and a second extension section distributed along the coal bed and communicated with the second submerged section; The communication section is arranged in the coal seam and used for communicating the first extension section and the second extension section; and the third injection and production well comprises a third submerged section penetrating through the coal bed from the ground surface, and one end of the third submerged section, which is arranged in the coal bed, is communicated with the communication section. Preferably, a dehydration device is arranged in the third injection well, and is used for dehydrating the coal bed gas to produce purified water and supplying the purified water to the extraction and gasification unit and the gas processing unit. Preferably, the gas purification unit comprises a dust removal tower for removing dust from the gas to be processed, a desulfurizing tower for desulfurizing the gas to be processed and a benzene removal tower for removing benzene from the gas to be processed, which are sequentially connected. Preferably, the gas processing unit comprises at least one ste