CN114837648B - Power coal underground in-situ controllable combustion heat production and carbon burial integrated system and method - Google Patents
Power coal underground in-situ controllable combustion heat production and carbon burial integrated system and method Download PDFInfo
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- CN114837648B CN114837648B CN202210433658.6A CN202210433658A CN114837648B CN 114837648 B CN114837648 B CN 114837648B CN 202210433658 A CN202210433658 A CN 202210433658A CN 114837648 B CN114837648 B CN 114837648B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a power coal underground in-situ controllable combustion heat production and carbon burial integrated system, wherein a horizontal well is positioned at a position close to the bottom in a coal seam for implementing in-situ combustion, a combustion-supporting air supply pipe is laid along the horizontal well after passing through a vertical well, a heat exchange circulating liquid pipe is laid along the horizontal well after passing through the vertical well and then is connected out from the vertical well, an electric ignition device is arranged at the front end of the combustion-supporting air supply pipe, the horizontal section of the combustion-supporting air supply pipe adopts a sieve pipe structure and adopts high-temperature self-melting material for hole sealing, hole sealing structures are arranged between the combustion-supporting air supply pipe and the heat exchange circulating liquid pipe and the wall of the vertical well, a pressure sensor is arranged in the well, and the heat exchange circulating liquid pipe is connected with a ground heat exchanger for power generation or heat supply; also discloses an integrated method of underground in-situ controllable combustion heat recovery and carbon burial of the power coal; the coal bed underground in-situ controllable continuous combustion can be realized, the combustion heat can be fully extracted and utilized, and the carbon can be buried underground in situ.
Description
Technical Field
The invention relates to the technical field of heat energy utilization and environmental protection in coal mining.
Background
At present, power coal is mainly mined to the ground surface through coal mining operation, washed and then transported to power and heat supply factories such as thermal power plants, heat supply plants and the like, and the power coal generates heat and electricity through combustion to provide energy for power and heat demanders. China promises to achieve carbon peak by 2030 years ago and achieve the carbon neutralization goal by 2060 years ago. According to the estimation of related research institutions at home and abroad, the energy industry in China is the main industry of carbon emission, and CO emitted in the process of coal combustion utilization 2 Is the main body of carbon emission in the energy industry of China, and accounts for more than 55 percent of the carbon emission of China. The main utilization direction of the power coal is to generate heat energy through combustion, the heat energy is mainly used for power generation, and CO is discharged by coal 2 The main body of (1). In order to achieve the carbon peak reaching and carbon neutralization targets before 2030 years and 2060 years, the combustion and heat utilization technology of the power coal with low emission to zero emission needs to be developed, and the problem of carbon emission in the combustion and utilization process of the power coal is fundamentally solved.
The underground coal combustion technology has been developed for decades, and in the last decade, the underground coal combustion is mainly used for underground coal gasification to obtain substance products such as coal gas and the like. The underground coal gasification generates a large amount of heat energy, but the heat energy generated by the gasification is not well utilized due to the fact that the underground coal gasification is not a focus of attention, so that great heat energy waste is caused, and in addition, the problem of carbon emission still exists in the process of reburning the obtained coal gas.
Disclosure of Invention
The invention aims to provide a power coal application technology for underground in-situ controllable continuous combustion of a coal bed, which can fully extract and utilize combustion heat and bury carbon underground in situ.
Therefore, the technical scheme adopted by the invention is as follows: the utility model provides a controllable burning of power coal underground normal position is adopted heat and integrative system of carbon buries, includes vertical well, horizontal well, combustion-supporting air supply pipe, heat exchange circulation liquid pipe and electric ignition device, the horizontal well is located and leans on bottom position department in implementing the in situ combustion coal seam, and the horizontal well communicates with each other with vertical well, and combustion-supporting air supply pipe lays along the horizontal well through vertical well back, and heat exchange circulation liquid pipe is laid the back through vertical well and is received out by vertical well again, electric ignition device installs the front end at combustion-supporting air supply pipe, and the front end of combustion-supporting air supply pipe is provided with the gas outlet to electric ignition device, and the horizontal segment of air supply pipe adopts the screen pipe structure and adopts high temperature self-melting material hole sealing, be provided with the hole sealing structure between the wall of combustion-supporting air supply pipe, heat exchange circulation liquid pipe and vertical well, install pressure sensor in the well, heat exchange liquid pipe circulation liquid pipe links to each other with ground heat exchanger and is used for electricity generation or heat supply.
Preferably, the vertical well and the horizontal well are respectively provided, one end of the horizontal well is communicated with the lower end of the vertical well, the whole body is L-shaped, and the heat exchange circulating liquid pipe and the combustion-supporting air supply pipe are L-shaped and are laid along the vertical well and the horizontal well; the heat exchange circulating liquid pipe is of a double-layer sleeve structure, the front end of the outer sleeve is closed, and the front end of the inner sleeve is open and communicated with the outer sleeve; the combustion-supporting air supply pipe is arranged outside the heat exchange circulating liquid pipe in parallel or sleeved outside the heat exchange circulating liquid pipe.
Preferably, the horizontal well adopts a structural form of a plurality of horizontal wells, and one end of each horizontal well is communicated with the lower end of the vertical well; correspondingly, the horizontal sections of the heat exchange circulating liquid pipe and the combustion-supporting air supply pipe adopt a branch pipe structure, and a branch pipe is arranged in each horizontal branch well.
Preferably, the number of the vertical wells is two, the number of the horizontal wells is one, two ends of each horizontal well are respectively communicated with the lower end of the corresponding vertical well, and the whole vertical well is U-shaped; the heat exchange circulating liquid pipe is U-shaped and is laid along two vertical wells and a horizontal well, the combustion-supporting air supply pipe is L-shaped and is laid along one vertical well and one horizontal well, and the combustion-supporting air supply pipe is laid in parallel outside L section of the heat exchange circulating liquid pipe or sleeved outside the L section of the heat exchange circulating liquid pipe.
Preferably, the horizontal wells adopt a structural form of a plurality of horizontal wells, and two ends of each horizontal well are respectively communicated with the lower ends of the corresponding vertical wells; correspondingly, the horizontal sections of the heat exchange circulating liquid pipe and the combustion-supporting air supply pipe adopt a branch pipe structure, and a branch pipe is arranged in each horizontal well.
Preferably, high-strength cement mortar is adopted for sealing holes between the combustion-supporting air supply pipe, the heat exchange circulating liquid pipe and the wall of the vertical well, and the pressure sensor is installed on the inner wall of the combustion-supporting air supply pipe close to the well mouth.
Meanwhile, the invention also provides a power coal underground in-situ controllable combustion heat recovery and carbon burial integrated method, which comprises the following steps:
firstly, selecting a coal bed distribution area suitable for carbon burial;
secondly, installing the power coal underground in-situ controllable combustion heat production and carbon burial integrated system;
thirdly, injecting circulating liquid into the heat exchange circulating liquid pipe to serve as a heat taking medium;
fourthly, injecting combustion-supporting gas into the combustion-supporting gas supply pipe, switching on an electric ignition device, and igniting and burning the gas from a gas outlet at the front end of the combustion-supporting gas supply pipe;
fifthly, in the combustion process, the temperature in the target coal seam is gradually increased, and the heated circulating liquid is recycled and sent into the well after being subjected to heat exchange and utilization outside the well; in the combustion process, the pressure in the well is monitored through the pressure sensor, oxygen with enough pressure can be injected into the well, the coal bed is continuously combusted, flameout does not occur, meanwhile, the pressure change in the well is monitored through the pressure sensor, the pressure in the well is continuously increased firstly, and then the pressure starts to be reduced after reaching the peak value, and the fracturing of the stratum at the moment is shown; in the combustion process, the temperature of the combustion-supporting air supply pipe is gradually increased, when the temperature reaches the melting temperature of the high-temperature self-melting material on the sieve tube, sieve pores on the sieve tube are sequentially opened from front to back, and combustion flame is guided to spread to the root along the horizontal section of the combustion-supporting air supply pipe;
and sixthly, stopping supplying combustion-supporting gas when the coal bed burns to the root of the horizontal section, extinguishing the combustion area, continuously taking heat by using waste heat through the heat exchange circulating liquid pipe, sealing the wellhead pipeline after the heat is taken out, and burying carbon underground in situ by combining the combustion cavity, the hole sealing structure of the well wall and the peripheral rock stratum.
And in the fifth step, monitoring the form of the combustion control area by using a wide-area electromagnetic method.
In order to realize underground in-situ controllable combustion, heat exchange heat recovery and automatic carbon burial of power coal, three problems need to be solved: (1) The underground in-situ controllable continuous combustion of the coal bed comprises controllable combustion range and continuous combustion; the coal seam at the deep part of the underground is in an anoxic state, the continuous and stable combustion of the coal seam is maintained, combustion-supporting gas (such as oxygen) needs to be supplied uninterruptedly, and the supply position of the combustion-supporting gas is limited and the combustion spreading direction is guided through the structural form that the sieve tube is automatically opened at high temperature, so that the controllable combustion range and the sustainability of the combustion can be ensured; (2) The coal bed combustion is controlled within the range of the heat recovery device, so that the full recovery and utilization of combustion heat are ensured, the combustion-supporting gas supply pipe and the heat exchange circulating liquid pipe are arranged in a matched manner, and meanwhile, the waste heat is facilitated to continue heat recovery after combustion and flameout, so that the controllable combustion of the coal bed and the full and maximized utilization of the combustion heat can be realized; (3) During specific construction, a coal bed distribution area beneficial to carbon burial needs to be selected, a wellhead pipeline is sealed after combustion is finished, and underground in-situ burial is carried out on carbon by combining a combustion cavity, a hole sealing structure of a well wall and peripheral rock strata, so that CO generated by underground in-situ combustion of the coal bed is ensured 2 、SO 2 NOx and waste residues can be buried directly.
The invention has the beneficial effects that: the coal underground in-situ combustion control and combustion-supporting gas supply pipe is adopted, a sieve pipe structure with a hole sealed by a high-temperature self-melting material is adopted, a heat exchange circulating liquid pipe is preset in a combustion area for heat collection, complete combustion is guaranteed not to be extinguished, combustion flame is guided to spread to the root along the horizontal section of the combustion-supporting gas supply pipe, and collected heat is used for requirements of power generation, heat supply equipment and the like; implementing underground in-situ controllable combustion of power coal to produce heat, heat exchange to produce heat, heat power generation or heat supply utilization, and simultaneously using CO produced by combustion 2 、SO 2 Gases such as NOx are firstly sealed in a combustion space area, and are gradually absorbed, solidified and permanently sealed by saline water in surrounding strata and strata, so that zero emission to extremely low emission utilization of power coal is realized, and the strategic target of greatly reducing carbon emission while the utilization amount of coal meets the integral requirement of national energy is achieved.
Drawings
Fig. 1 is a schematic view of a first structure of the present invention.
Fig. 2 is a schematic diagram of a second structure form of the invention.
Fig. 3 is a schematic view of a third structural form of the invention.
Fig. 4 is a schematic diagram of a fourth structural form of the invention.
Fig. 5 is a schematic view of a fifth structural form of the invention.
Fig. 6 is a schematic view of a sixth structural form of the invention.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:
referring to fig. 1 and 4, the power coal underground in-situ controllable combustion heat recovery and carbon burial integrated system mainly comprises a vertical well 1, a horizontal well 2, a combustion-supporting gas supply pipe 3, a heat exchange circulating liquid pipe 4, an electric ignition device (not shown in the figure), a ground heat exchanger 7, a pressure sensor (not shown in the figure) and a hole sealing structure.
The horizontal well 2 is positioned at the position close to the bottom in the coal seam 6 for implementing in-situ combustion, and the horizontal well 2 is communicated with the vertical well 1. The combustion-supporting gas supply pipe 3 is laid along the horizontal well 2 after passing through the vertical well 1, and the heat exchange circulating liquid pipe 4 is laid along the horizontal well 2 through the vertical well 1 and then is connected out of the vertical well 1. The horizontal pipe section is to be deployed at the bottom of a target coal seam, and the extension length in the coal seam is generally more than 1000m-1500m, so that deformation in the combustion process is prevented.
The electric ignition device is arranged at the front end of the combustion-supporting air supply pipe 3, and the front end of the combustion-supporting air supply pipe 3 is provided with an air outlet which is right opposite to the electric ignition device, so that air is just supplied during ignition. The horizontal section of the combustion-supporting gas supply pipe 3 adopts a sieve pipe structure 3a, namely a plurality of sieve holes are arranged on the horizontal section at intervals from front to back in sequence; and sealing holes by using a high-temperature self-melting material, preferably by using a high-temperature material resistant to 500-700 ℃. When the temperature exceeds the melting temperature, the plugging material melts, the sieve pores open to supply air to the combustion area and the nearby area, and the combustion range and the combustion expansion direction are controlled. The screen diameter is preferably not less than 65mm.
And a hole sealing structure is arranged between the combustion-supporting air supply pipe 3, the heat exchange circulating liquid pipe 4 and the wall of the vertical well 1 and is used for sealing the hole at the position of the well mouth. Preferably, the combustion-supporting air supply pipe 3, the heat exchange circulating liquid pipe 4 and the wall of the vertical well 1 are sealed by high-strength cement mortar, so that the high-pressure gas in the combustion control area can be borne. A pressure sensor is arranged in the well, preferably, the pressure sensor is arranged on the inner wall of the combustion-supporting gas supply pipe 3 close to the well head, the pressure sensor is used for detecting the pressure in the well, the pressure in the well is equivalent to the pressure in the combustion-supporting gas supply pipe 3, and the combustion-supporting gas can be injected into a combustion area only by ensuring that the gas injection pressure is larger than the pressure in the well. The heat exchange circulating liquid pipe 4 is connected with a ground heat exchanger 7 for power generation or heat supply. The ground heat exchanger 7 is mounted on the ground 5.
One of the specific structural forms is as follows: as shown in figure 1, a vertical well 1 and a horizontal well 2 are respectively arranged, one end of the horizontal well 2 is communicated with the lower end of the vertical well 1, and the whole body is L-shaped. Accordingly, the heat exchange circulation fluid pipe 4 and the combustion air supply pipe 3 are L-shaped and are laid along the vertical well 1 and the horizontal well 2. The heat exchange circulating liquid pipe 4 adopts a double-layer sleeve structure, the front end of an outer sleeve 4a is closed, and the front end of an inner sleeve 4b is opened and communicated with the outer sleeve 4 a. The suit of combustion-supporting air supply pipe 3 forms three-layer sleeve pipe structure outside heat exchange circulation liquid pipe 4, does in proper order: an inner sleeve 4b, an outer sleeve 4a and a combustion-supporting air supply pipe 3.
The second specific structure form: as shown in fig. 2, it is basically the same as one of the structural forms except that: the combustion-supporting air supply pipe 3 is arranged outside the heat exchange circulating liquid pipe 4 in parallel and comprises a horizontal section and a vertical section.
The third specific structural form is as follows: as shown in fig. 3, it is basically the same as one of the structural forms except that: the horizontal well 2 adopts a structural form of a plurality of horizontal wells, and one end of each horizontal well 2 is communicated with the lower end of the vertical well 1; accordingly, the horizontal sections of the heat exchange circulation liquid pipe 4 and the combustion-supporting gas supply pipe 3 adopt a branch pipe structure, and a branch pipe is arranged in each horizontal well. The combustion-supporting air supply pipe 3 can be sleeved with the heat exchange circulating liquid pipe 4, and can also be arranged in parallel with the heat exchange circulating liquid pipe 4. The multiple horizontal water dividing wells increase the combustion range and improve the heat supply.
The specific structural form is four: as shown in fig. 4, two vertical wells 1 are provided, one horizontal well 2 is provided, and two ends of each horizontal well 2 are respectively communicated with the lower end of the corresponding vertical well 1, so that the whole body is U-shaped. The heat exchange circulating liquid pipe 4 is U-shaped and is laid along two vertical wells 1 and one horizontal well 2, and the combustion-supporting gas supply pipe 3 is L-shaped and is laid along one vertical well 1 and one horizontal well 2. The combustion-supporting air supply pipe 3 is sleeved outside the L section of the heat exchange circulating liquid pipe 4. One vertical well 1 is used for water supply and gas supply, and the other vertical well 1 is used for hot water extraction. The temperature of the hot water is controlled by controlling the range of the combustion zone and the flow rate of the water. Because the water circulation is realized vertically through the two pipes, the temperature of the extracted high-temperature water is not influenced by the entering low-temperature water, and the heat utilization efficiency is high.
The concrete structural form is five: as shown in fig. 5, the structure is basically the same as the structure, except that: the combustion-supporting air supply pipe 3 is laid outside the L-shaped heat exchange circulating liquid pipe 4 in parallel.
The specific structural form is six: as shown in fig. 6, the structure is basically the same as the structure, except that: the horizontal wells 2 adopt a structural form of a plurality of horizontal wells, and two ends of each horizontal well 2 are respectively communicated with the lower ends of the corresponding vertical wells 1. Accordingly, the horizontal sections of the heat exchange circulation liquid pipe 4 and the combustion-supporting gas supply pipe 3 adopt a branch pipe structure, and a branch pipe is arranged in each horizontal well. The combustion-supporting air supply pipe 3 can be sleeved with the heat exchange circulating liquid pipe 4, and can also be arranged in parallel with the heat exchange circulating liquid pipe 4.
A power coal underground in-situ controllable combustion heat recovery and carbon burial integrated method comprises the following steps:
the method comprises the steps of firstly, selecting a coal bed distribution area suitable for carbon burial, and avoiding selecting a coal bed with a fracture zone and the like which influence the carbon burial.
And secondly, installing the power coal underground in-situ controllable combustion heat production and carbon burial integrated system.
And thirdly, injecting a circulating liquid serving as a heat-taking medium, preferably water, into the heat exchange circulating liquid pipe 4.
And fourthly, injecting combustion-supporting gas into the combustion-supporting gas supply pipe 3, switching on an electric ignition device, and igniting and burning the gas discharged from a gas outlet at the front end of the combustion-supporting gas supply pipe 3, wherein the electric ignition device can be an electric heating ignition device or an electromagnetic ignition device.
Fifthly, in the combustion process, the temperature in the target coal seam is gradually increased, and the heated circulating liquid is recycled and sent into the well after heat exchange outside the well; in the combustion process, the pressure in the well is monitored through the pressure sensor, oxygen with enough pressure can be injected into the well, the coal bed is continuously combusted, flameout does not occur, meanwhile, the pressure change in the well is monitored through the pressure sensor, the pressure in the well is continuously increased firstly, and then the pressure starts to be reduced after reaching the peak value, and the fracturing of the stratum at the moment is shown; in the combustion process, the temperature of the combustion-supporting air supply pipe 3 is gradually increased, when the melting temperature of the high-temperature self-melting material on the sieve pipe is reached, sieve holes on the sieve pipe are sequentially opened from front to back, and combustion flame is guided to spread to the root along the horizontal section of the combustion-supporting air supply pipe 3. In the fifth step, the morphology of the combustion control area can be monitored by using geophysical monitoring means such as a wide-area electromagnetic method and the like, so that the design requirement is met; also can be by preceding a plurality of temperature sensor of interval arrangement in proper order after by on the screen pipe, the sieve mesh on the screen pipe is by the preceding in-process of opening in proper order after, and temperature sensor destroys gradually to judge whether the coal seam burns to horizontal section root.
Sixthly, when the coal bed burns to the root of the horizontal section, stopping supplying combustion-supporting gas to extinguish the combustion area, continuously taking heat by using waste heat through the heat exchange circulating liquid pipe 4, and then sealing the wellhead pipeline; the sealing of the well head pipeline combines the combustion cavity, the hole sealing structure of the well wall and the surrounding rock strata to bury the carbon underground in situ, which is also called permanent sealing.
The method replaces the coal underground mining technology, and simultaneously, the safety problem of coal underground mining and the problem of underground water drainage are fundamentally solved; the method replaces the power coal power generation technology, and simultaneously replaces the thermal power plant pollution treatment technology and the carbon capture and carbon sequestration technology after combustion; the coal underground gasification technology with the aim of power generation is replaced, mixed gas is not produced, and heat energy is directly produced; the electric power is directly transmitted, so that a large amount of transportation capacity is reduced; can utilize deep coal resources below 1000 m.
The technical route adopted by the invention is that a combustion-supporting air supply pipe and a heat exchange circulating liquid pipe are pre-buried or arranged by drilling in a combustion area, after the coal bed is ignited, the coal bed can be ensured to be completely combusted in a controllable manner by controlling the sustainable combustion and combustion direction of the coal bed, the combustion heat of the coal bed is collected by the pre-arranged heat exchange circulating liquid pipe, the collected heat is used for utilizing heat energy such as power generation, heat supply and the like through heat exchange, and CO generated by combustion is generated 2 、SO 2 The nitrogen oxides and the combustion waste residues are directly and automatically sealed underground and absorbed and solidified by stratum and stratum water. The implementation of the scheme forms a brand new power coal utilization technical route, changes the current coal mining, transportation, power generation and heat supply pattern, forms a brand new underground in-situ combustion, heat collection, power generation and heat supply pattern of coal, and greatly reduces CO in the process of mining, transporting and utilizing the power coal 2 、SO 2 And the emission of nitrogen oxides eliminates the emission of waste residues generated by combustion of power coal, and realizes the aim of green development and utilization from low emission to zero emission of the power coal. If the drilling is carried out, the diameter of a horizontal section of a borehole meeting the requirements of three layers of casings is above 244.5mm, and the corresponding borehole diameter of a straight pipe section is increased on the basis.
If the oxygen supply is stopped, the burning coal bed can be automatically extinguished due to oxygen deficiency, and the in-situ burning of the coal bed is stopped, so that the continuous oxygen supply is particularly important in the burning process. At the same time, the high-temperature high-pressure (or supercritical) CO generated by combustion 2 、SO 2 Gas such as nitrogen oxides rapidly permeates into surrounding relatively low-pressure stratum through fractures and pores under the action of differential pressure, and is neutralized by cations such as Ca +, mg +, fe + and the like in the stratum and stratum water to form solid minerals such as calcium carbonate, magnesium carbonate and the like, and the solid minerals are permanently sealed; the solid waste generated by combustion is directly buried in the combustion space area. The novel underground in-situ combustion heat production-carbon burial technology for the power coal comprehensively changes the traditional complicated power coal combustion power generation technical routes of coal mining, washing, transportation, power plant combustion heat production power generation, desulfurization, denitration, carbon capture, carbon sequestration and the like, and realizes the purposes of obtaining the heat energy of the power coal and burning CO generated by the power coal 2 Equal greenhouse gasAnd a green and environment-friendly utilization mode of directly burying solid wastes.
Claims (3)
1. The utility model provides a power coal underground normal position controllable burning heat recovery and integrative system of carbon buries, includes vertical well (1), horizontal well (2), its characterized in that: still include combustion-supporting air supply pipe (3), heat exchange circulation liquid pipe (4) and electric ignition device, horizontal well (2) are located and lean on bottom position department in implementing the normal position burning coal seam, and horizontal well (2) communicate with each other with vertical well (1), and combustion-supporting air supply pipe (3) are laid along horizontal well (2) through vertical well (1), and heat exchange circulation liquid pipe (4) are laid back along horizontal well (2) through vertical well (1) and are followed back and then connect out by vertical well (1), the front end at combustion-supporting air supply pipe (3) is installed to electric ignition device, and the front end of combustion-supporting air supply pipe (3) is provided with the gas outlet just to electric ignition device, and the horizontal section of combustion-supporting air supply pipe (3) adopts screen pipe structure (3 a) and adopts high temperature from melting material hole sealing, be provided with the hole sealing structure between the wall of combustion-supporting air supply pipe (3), heat exchange circulation liquid pipe (4) and vertical well (1), install pressure sensor in the well, heat exchange circulation liquid pipe (4) link to each other with ground heat exchanger and are used for electricity generation or heat supply.
2. A power coal underground in-situ controllable combustion heat recovery and carbon burial integrated method is characterized by comprising the following steps:
firstly, selecting a coal bed distribution area suitable for carbon burial;
secondly, carrying out the installation of the power coal underground in-situ controllable combustion heat production and carbon burial integrated system in claim 1;
thirdly, injecting a circulating liquid into the heat exchange circulating liquid pipe (4) as a heat-extracting medium;
fourthly, injecting combustion-supporting gas into the combustion-supporting gas supply pipe (3), switching on an electric ignition device, and igniting and burning the gas from a gas outlet at the front end of the combustion-supporting gas supply pipe (3);
fifthly, in the combustion process, the temperature in the target coal seam is gradually increased, and the heated circulating liquid is recycled and sent into the well after being subjected to heat exchange and utilization outside the well; in the combustion process, the pressure in the well is monitored through the pressure sensor, oxygen with enough pressure can be injected into the well, the coal bed is continuously combusted, flameout does not occur, meanwhile, the pressure change in the well is monitored through the pressure sensor, the pressure in the well is continuously increased firstly, and then the pressure starts to be reduced after reaching the peak value, and the fracturing of the stratum at the moment is shown; in the combustion process, the temperature of the combustion-supporting gas supply pipe (3) is gradually increased, when the melting temperature of the high-temperature self-melting material on the sieve pipe is reached, sieve holes on the sieve pipe are opened from front to back in sequence, and combustion flame is guided to spread to the root along the horizontal section of the combustion-supporting gas supply pipe (3);
and sixthly, stopping supplying combustion-supporting gas when the coal bed burns to the root of the horizontal section, extinguishing the combustion area, continuously taking heat by using waste heat through the heat exchange circulating liquid pipe (4), sealing a wellhead pipeline after the heat is taken out, and carrying out underground in-situ burial on carbon by combining the combustion cavity, the hole sealing structure of the well wall and the peripheral rock stratum.
3. The power coal underground in-situ controllable combustion heat production and carbon burial integrated method according to claim 2, characterized in that: and in the fifth step, monitoring the form of the combustion control area by using a wide-area electromagnetic method.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4018279A (en) * | 1975-11-12 | 1977-04-19 | Reynolds Merrill J | In situ coal combustion heat recovery method |
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| CN105545270A (en) * | 2015-12-15 | 2016-05-04 | 大连理工大学 | Natural gas hydrate exploitation method and device adopting in-situ combustion method |
| WO2018225052A1 (en) * | 2017-06-06 | 2018-12-13 | Michael Kipnis | Method for energy recovery through combustion in-situ of solid fuel |
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| US8915084B2 (en) * | 2012-03-08 | 2014-12-23 | 7238703 Canada Inc. | Heat energy extraction system from underground in situ combustion of hydrocarbon reservoirs |
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- 2022-04-24 CN CN202210433658.6A patent/CN114837648B/en active Active
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| US4018279A (en) * | 1975-11-12 | 1977-04-19 | Reynolds Merrill J | In situ coal combustion heat recovery method |
| US4019577A (en) * | 1976-02-23 | 1977-04-26 | Mobil Oil Corporation | Thermal energy production by in situ combustion of coal |
| CN201083119Y (en) * | 2007-03-30 | 2008-07-09 | 四川石油管理局钻采工艺技术研究院 | Oil gas well completion temporary block liner tube |
| CN102094615A (en) * | 2010-12-17 | 2011-06-15 | 中国石油集团长城钻探工程有限公司 | Coal bed gas horizontal well thermal sieve tube well completion method |
| CN105545270A (en) * | 2015-12-15 | 2016-05-04 | 大连理工大学 | Natural gas hydrate exploitation method and device adopting in-situ combustion method |
| WO2018225052A1 (en) * | 2017-06-06 | 2018-12-13 | Michael Kipnis | Method for energy recovery through combustion in-situ of solid fuel |
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| CN217330285U (en) | 2022-08-30 |
| CN114837648A (en) | 2022-08-02 |
| CN217357614U (en) | 2022-09-02 |
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