CN114718543A - Pipeline cutting device and method for realizing underground coal gasification mobile gas injection - Google Patents
Pipeline cutting device and method for realizing underground coal gasification mobile gas injection Download PDFInfo
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- CN114718543A CN114718543A CN202210409792.2A CN202210409792A CN114718543A CN 114718543 A CN114718543 A CN 114718543A CN 202210409792 A CN202210409792 A CN 202210409792A CN 114718543 A CN114718543 A CN 114718543A
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- 238000002347 injection Methods 0.000 title claims abstract description 212
- 239000007924 injection Substances 0.000 title claims abstract description 212
- 238000002309 gasification Methods 0.000 title claims abstract description 150
- 239000003245 coal Substances 0.000 title claims abstract description 117
- 238000005520 cutting process Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002844 melting Methods 0.000 claims abstract description 61
- 230000008018 melting Effects 0.000 claims abstract description 50
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 49
- 239000012943 hotmelt Substances 0.000 claims abstract description 48
- 238000007537 lampworking Methods 0.000 claims abstract description 47
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims description 199
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
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- 238000005553 drilling Methods 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 3
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 3
- 230000004044 response Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
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- 230000026058 directional locomotion Effects 0.000 description 4
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
-
- 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
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- Geochemistry & Mineralogy (AREA)
- Supports For Pipes And Cables (AREA)
Abstract
The invention relates to the technical field of underground coal gasification, in particular to a pipeline cutting device for realizing movable gas injection of underground coal gasification, which comprises a gas pipe which is positioned in a gas injection drill hole and is formed by connecting a plurality of gas injection pipe sections, every two adjacent gas injection pipe sections form a group of gas injection pipes, each group of gas injection pipes are fixedly connected through a connecting ring, the middle parts of the two gas injection pipe sections of each group are connected through a cutting device body, the cutting device body consists of a snap ring, a high-temperature resistant spring and a hot melt ring, the snap ring is respectively arranged on the inner walls of the left and right gas injection pipe sections of the cutting device body, a high-temperature resistant spring in a compressed state is abutted between the clamping rings, the gas injection pipe sections provided with the clamping rings are fixedly connected through the hot melting rings, when the flame working surface reaches the hot-melting ring, a new gas injection hole is formed after the hot-melting ring is disconnected, and a gasification agent is provided for gasification reaction through a new gas injection port. The invention also provides a pipeline cutting method for realizing the movable gas injection of underground coal gasification.
Description
Technical Field
The invention relates to the technical field of underground coal gasification, in particular to a pipeline cutting device and method for realizing movable gas injection of underground coal gasification.
Background
Underground coal gasification is a process in which coal located underground is burned in a controlled manner and combustible gas is produced by the thermal and chemical action of the coal. The underground gasification technology only extracts energy-containing components in coal, changes physical coal mining into chemical coal mining, realizes the combination of three processes of well building, coal mining and ground gasification, and saves huge processes and equipment for coal mining, transportation, washing, gasification and the like, so the underground gasification technology has the advantages of good safety, low investment, high efficiency, low pollution and the like, and is known as a second-generation coal mining method. The underground coal gasification technology can not only recover the coal resources abandoned by the mine, but also be used for mining thin coal seams, deep coal seams, coal pressing under 'three times' and coal seams with high sulfur, high ash and high gas which are difficult to mine by miners or have poor economy and safety. The coal gas produced by underground gasification can be used as fuel gas for direct civil use and power generation, or used as raw material gas for extracting pure hydrogen, synthetic oil, dimethyl ether, ammonia and methanol. Therefore, the underground coal gasification technology has better economic benefit and environmental benefit, greatly improves the utilization rate and utilization level of coal resources, and is an important research and development direction of clean coal technology in China.
The underground coal gasification technology is characterized in that a closed gasification furnace is constructed in an underground coal seam, a gasification agent gas injection pipeline in the underground coal gasification furnace provides a gasification agent mainly comprising oxygen and water vapor for combustion gasification reaction, and a flame working surface formed by combustion and gasification is pushed in a certain direction so as to realize the continuous production of the underground coal gasification furnace.
The coal gas production process of the coal underground gasification furnace is as follows: underground coal gasification is a combustion and gasification reaction process of an underground in-situ coal bed, and a gas injection pipeline needs to be installed by drilling a hole into the coal bed manually. After the underground coal gasification furnace is successfully ignited, a gas injection pipeline continuously provides gasification agents (oxygen, air, water vapor and the like), the provided gasification agents and adjacent coal are subjected to combustion and gasification reaction to generate coal gas (CO, H2, CH4 and the like), and the temperature of a reaction interface can reach 800-1200 ℃. In the underground coal gasification process, as the combustion and gasification progress, the coal body is continuously consumed, and the reaction interface (flame working face) of the underground gasification furnace is continuously moved. If gas injection pipe gas outlet position in the underground gasification stove is rigid, then lead to gas injection pipe gas outlet and underground gasification stove coal body reaction interface's position constantly to increase, the gasifying agent that provides need just can reach coal body reaction interface through long distance gas diffusion, then can cause the oxygen in the gasifying agent and the combustible gas mixture that generates, cause the gas quality to reduce and even lead to the gas explosion in the underground gasification stove inner enclosure, bring very big potential safety hazard.
The main technical scheme of the movable gas injection device and the technical aspect of the existing domestic and overseas coal underground gasification furnace is as follows:
chinese patent publication No. CN107387055B, "a mobile gas injection device and method suitable for underground coal gasification," discloses a mobile gas injection device and method suitable for underground coal gasification, which mainly includes a gas injection channel drilling hole, a gas injection channel protection pipe, a gas injection pipeline, a hot-melt elastic connector, and a snap-in connector. The technical scheme is that a gas injection channel protective pipe is required to be installed in a gas injection drill hole of the underground coal gasification furnace, and the gas injection channel protective pipe is a sieve pipe; the hot-melt elastic connector is arranged at a certain position of the gas injection pipeline and consists of a hot-melt bolt, a concave butt flange and an embedded spring. The snap-in connector connects the two sections of gas injection pipelines together.
Although the existing technical scheme can realize the disconnection and the cutoff of the pipeline by the hot-melt bolt, the device has a complex structure and high cost, an inner protection pipe of a gas injection drill hole needs to be installed, and meanwhile, the connection mode needs to be connected by a concave flange, the gas injection pipeline is not easy to be installed in the gas injection drill hole in the underground coal gasification furnace, the installation resistance of the gas injection pipeline in the gas injection drill hole can be increased by the edge of the convex flange, and the gas injection pipeline can be even clamped in the gas injection drill hole and is difficult to be successfully installed; the length of an embedded spring in the concave flange is limited by the size of the concave flange, the number of turns of the spring is small, the elasticity is small, and two adjacent gas injection pipelines are difficult to spring open; the buckle formula connector directly passes through the buckle butt joint, and is sealed not tight, causes the gas leakage of opening connector position gas injection pipeline, leads to being full of oxygen in the gas injection passageway, leads to the reverse burning of coal fire, leads to the hot melt formula elastic connector on the whole gas injection pipeline to be heated the disconnection easily to lead to the device to become invalid, be difficult to realize removing the effect of gas injection.
Disclosure of Invention
The invention aims to provide a pipeline cutting device for realizing movable gas injection of underground coal gasification, which can solve the problem that an injection pipe in an underground coal gasification furnace can only inject gas at a fixed point and ensure the continuity and stability of a gas production process of the underground coal gasification furnace.
The invention provides a pipeline cutting device for realizing movable gas injection of underground coal gasification, which is used together with a gas injection drill hole reserved at the bottom of a coal layer and comprises a gas pipe which is positioned in the gas injection drill hole and is formed by connecting a plurality of gas injection pipe sections, every two adjacent gas injection pipe sections form a group of gas injection pipes, each group of gas injection pipes are fixedly connected through a connecting ring, the middle parts of the two gas injection pipe sections of each group are connected through a cutting device body, the cutting device body consists of a snap ring, a high-temperature resistant spring and a hot melt ring, the snap ring is respectively arranged on the inner walls of the left and right gas injection pipe sections of the cutting device body, a high-temperature resistant spring in a compressed state is abutted between the clamping rings, the gas injection pipe sections provided with the clamping rings are fixedly connected through the hot melting rings, when the flame working surface reaches the hot-melting ring, a new gas injection hole is formed after the hot-melting ring is disconnected, and a gasification agent is provided for gasification reaction through a new gas injection port.
Further, according to the combustion moving speed of the flame working face, the cutting device bodies are arranged in the whole gas injection drill hole at equal intervals.
Furthermore, the hot melting ring is made of aluminum magnesium alloy with the melting point of 650 ℃.
Furthermore, both ends of the gas injection pipe are provided with threads which are in threaded connection with the connecting ring and maintain the air tightness of the connection part.
Further, two ends of the hot melt ring are connected with the adjacent gas injection pipe sections through threads, and the gas tightness of the connection position is kept.
Furthermore, the snap ring is a metal ring which is embedded and welded on the inner wall of the gas injection pipe section, and plays a role in fixing the position of the high-temperature-resistant spring.
Furthermore, the high-temperature-resistant spring is a high-temperature-resistant and high-strength spring which is embedded in the joint of the hot-melting ring and the gas injection pipe section, two ends of the high-temperature-resistant spring are clamped at the position of the clamping ring, and the high-temperature-resistant spring is in a compressed state after being installed; after the hot melting ring is melted to a melting point, the spring in a compressed state pushes the gas injection pipe sections at the two ends away under the action of elastic force, and the gas pipe is cut off, so that the purpose of providing a new gasification agent injection opening is achieved.
Further, the inner diameters of the hot melt ring and the connecting ring are larger than the outer diameter of the gas injection pipe section, threads are arranged on the inner walls of the hot melt ring and the connecting ring, and threads are arranged on the outer wall of the gas injection pipe section.
Further, the pipe diameter range of the gas conveying pipe is DN 80-DN 600, and the diameter of the gas conveying pipe is smaller than the gas injection drilled hole by 60-90 mm.
A pipeline cutting method for realizing movable gas injection of underground coal gasification comprises the following steps:
s1: parameter determination
Determining size parameters of a hot melt ring, a connecting ring, a clamping ring and a high-temperature resistant spring which need to be selected according to the specification and the size of a gas injection pipe in the underground coal gasification furnace; the hot melting ring and the connecting ring need to be internally threaded, so the outer diameter of the hot melting ring and the connecting ring is slightly larger than that of the gas injection pipe section, and the threaded connection part is ensured to have enough strength; the snap ring and the high-temperature-resistant spring are required to be nested in the gas injection pipe at the joint of the hot-melt ring and the gas injection pipe section, so that the outer diameter of the snap ring and the high-temperature-resistant spring is slightly smaller than the inner diameter of the gas injection pipe section, and the elastic force of the spring can ensure that the spring in a compressed state can push the previous section of pipeline away for a certain distance after the hot-melt ring is fused, so that a gas injection port with an enough opening is formed;
s2: the device is installed in the gas injection drill hole
In order to meet the requirements of underground coal mine roadway transportation and installation of an air injection pipe in an air injection drill hole of an underground gasification furnace, a cutting device body and the air injection pipe are made into a sectionalized combined pipeline, a single-section combined pipeline comprises two sections of air injection pipe sections, a section of hot melting ring, a section of connecting ring, two clamping rings and a high-temperature resistant spring, the length of the single-section combined pipeline meets the requirements of underground coal mine roadway transportation, and meanwhile meets the requirements of sectionalized installation in the air injection drill hole in the underground coal gasification furnace, two adjacent sections of combined pipelines are connected together through threads and are directly installed in the air injection drill hole in the underground coal gasification furnace through a drilling machine;
s3: operation and operation of gasification furnace
During the normal operation of the underground coal gasification furnace, the gas pipe provides gasification agents for the flame working surface of the underground coal gasification furnace, the flame working surface moves along with the progress of underground gasification combustion and reaction, when the underground coal gasification furnace moves to the position of the hot melt ring, the hot melt ring continuously receives the high-temperature heat action of the flame working surface, the hot melt ring starts to melt after reaching the melting point of the hot melt ring, after the hot melt ring is partially melted through, the gasification agents flow out, and the heat release of chemical reaction under the action of oxygen accelerates the melting through of the hot melt ring; when the connecting force of the hot melting ring is smaller than the elastic force of the spring in a compressed state, the gas injection pipe is completely disconnected at the hot melting ring, the pipeline is cut off, a new gasification agent injection port is formed, and a gasification agent is provided for the combustion and gasification reaction process of the flame working surface through the new injection port.
Has the advantages that:
the invention is mainly used for cutting off the pipeline by passively triggering interval fusing of the gas injection pipeline in the coal underground gasification furnace so as to realize moving gas injection along with the directional movement of a flame working surface and ensure the safe, stable and continuous gas production of the coal underground gasification furnace; the device can be suitable for gas injection pipes with different calibers, and is convenient to install; the response temperature of the hot melting can be adjusted, and the response is sensitive and reliable; the distribution distance can be adjusted, and the operation is simple.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a sectional view of the installation of the mobile gas injection pipeline cutting device for underground coal gasification in the gas injection drill hole of the underground coal gasification furnace;
FIG. 2 is a cross-sectional view A-A of the installation section of the pipeline cutting device for mobile gas injection of underground coal gasification in the gas injection drill hole of the underground coal gasification furnace;
FIG. 3 is a connection diagram of the pipeline cutting device body for underground coal gasification mobile gas injection;
FIG. 4 is a partial enlarged view of the pipe cutting apparatus body for moving gas injection for underground coal gasification.
Description of reference numerals: 1-coal bed, 2-flame working face, 3-gas injection drill hole, 4-coal bed top bottom plate, 5-gas injection pipe section-1, 6-gas injection pipe section-2, 7-snap ring, 8-high temperature resistant spring, 9-hot melt ring, 10-connecting ring.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
A pipeline cutting device for realizing movable gas injection of underground coal gasification is disclosed, as shown in figure 1-4, and is used in cooperation with a gas injection drill hole 3 reserved at the bottom of a coal seam 1 between coal seam top and bottom plates 4, the diameter of the gas injection drill hole 3 is 200mm, and comprises a gas pipe which is arranged in the gas injection drill hole 3 and is formed by connecting a plurality of gas injection pipe sections 5 and 6 (a gas injection pipe section-1 and a gas injection pipe section-2), the diameter of the gas pipe is 140mm, every two adjacent gas injection pipe sections are a group of gas injection pipes, each group of gas injection pipes are fixedly connected through a connecting ring 10, the middle of each group of two gas injection pipe sections is connected through a cutting device body, the cutting device body is composed of a snap ring 7, a high temperature resistant spring 8 and a hot melt ring 9, the snap ring 7 is respectively arranged on the inner walls of the gas injection pipe sections at the left side and the right side of the cutting device body, the high temperature resistant spring 8 in a compression state is abutted between the snap rings 7, the snap ring 7 is a metal ring which is embedded and welded on the inner wall of the gas injection pipe section and plays a role in fixing the position of the high-temperature resistant spring 8. The gas injection pipe sections provided with the clamping rings 7 are fixedly connected through the hot melt rings 9, when the flame working surface 2 reaches the hot melt rings 9, the hot melt rings 9 are disconnected to form new gas injection holes, and the new gas injection holes provide gasification agents for gasification reaction. According to the burning moving speed of the flame working face, the cutting device bodies are arranged in the whole gas injection drill hole at equal intervals. When the position of the flame working surface moves to the position of the cutting device body on the gas injection pipe, the hot melting ring 9 of the cutting device body is passively fused under the action of high-temperature heat of the flame working surface, the built-in compression spring is triggered to release the elastic force of the spring to cut off the pipeline, a new gasifying agent injection port is formed, the gasifying agent required by the flame working surface of the underground coal gasification furnace is provided by the new gasifying agent injection port, and the gasifying agent conveyed by the new gasifying agent injection port is directly conveyed nearby to the position of the reaction interface of the flame working surface to continuously and stably provide the gasifying agent, so that the aims of moving at intervals along with the directional movement of the flame working surface, and continuously and stably providing the gasifying agent are fulfilled.
The temperature near the coal underground gasification flame working face can reach 800-1200 ℃, the moving speed of the flame working face is generally 0.2-1.0 m/d, and when the hot melting ring is positioned near the flame working face, the temperature of the hot melting ring can reach the high temperature close to the flame working face in a short time due to the large heat conduction coefficient of metal, thereby creating conditions for the fusing of the hot melting ring at the high temperature. The hot-melting ring is made of an aluminum-magnesium alloy material with the melting point of about 650 ℃, so that the hot-melting elastic connector 4 is guaranteed to have reliable high-temperature fusing reaction characteristics, and the hot-melting ring is guaranteed to have better strength at normal temperature. When the temperature is higher than 650 ℃, the hot melting ring is fused within 12 hours, the maximum moving distance of the flame working surface is about 0.5m, and a formed new gas injection port is still near the flame working surface, so that the injection effect of the gasifying agent can be ensured.
Both ends of the gas injection pipe are provided with threads which are in threaded connection with the connecting ring and keep the air tightness of the joint, and both ends of the hot melting ring are connected with the adjacent gas injection pipe sections through the threads and keep the air tightness of the joint.
The high-temperature-resistant spring is a high-temperature-resistant and high-strength spring which is embedded in the joint of the hot-melting ring and the gas injection pipe section, and two ends of the high-temperature-resistant spring are clamped at the position of the clamping ring and are in a compressed state after being installed; when the hot melting ring is melted to a melting point, the spring in a compressed state pushes the gas injection pipe sections at the two ends open under the action of elastic force, and the gas pipe is cut off, so that the purpose of providing a new gasification agent injection opening is achieved.
The inner diameters of the hot melt ring and the connecting ring are larger than the outer diameter of the gas injection pipe section, the inner walls of the hot melt ring and the connecting ring are provided with threads, the outer wall of the gas injection pipe section is provided with threads, the hot melt ring and the connecting ring are respectively sleeved on the gas injection pipe section through the threads, the hot melt ring and the connecting ring are free of obstruction of a flange structure, and resistance of the gas injection pipe during installation in a gas injection drilling hole is reduced.
The working and using processes are as follows:
this cutting device establishes in the gas injection drilling in the coal bottom, and when the cutting device body that flame working face position removed on the gas injection pipe closes on the position, the hot melt ring receives flame working face high temperature thermal action and passive fusing and trigger the release spring and then cut off the gas injection pipe, forms new gasification agent filling opening, provides the required gasification agent of coal underground gasification stove flame working face by new gasification agent filling opening to reach the purpose that provides the gasification agent nearby along with flame working face directional movement and interval movement. The invention solves the problem that the gas injection pipe in the underground coal gasification furnace can only inject gas at a fixed point, and ensures the continuous and stable gas production process of the underground coal gasification furnace. The pipe cutting device provided by the invention can be suitable for gas injection pipes with different calibers, and is convenient to install; the response temperature of the hot melting can be adjusted, and the response is sensitive and reliable; the distribution distance can be adjusted, and the operation is simple.
The problem that a gas injection pipe in the underground coal gasification furnace can not realize that a gasification agent injection port moves along with the directional movement of a flame working surface and provides a gasification agent nearby is solved, and the problem that the coal gas quality is reduced and even the coal gas in the underground coal gasification furnace explodes due to the fact that the gasification agent is dispersed disorderly in the whole underground coal gasification furnace and is mixed with combustible gas is avoided; meanwhile, the problems of complex structure, high cost, small elasticity, difficulty in pipe cutting, gas leakage at the joint of the gas injection pipe, and difficulty in mounting or even difficulty in mounting the gas injection pipe in the gas injection drill hole in the prior technical scheme are solved.
The gas injection pipe sections are connected by threads, so that the gas injection pipe sections can be conveniently and directly installed in gas injection drill holes in the underground coal gasification furnace without installing drill hole protection pipes; the cutting device is suitable for gas injection pipes with different pipe diameters, and has simple structure and convenient combination; the installation space of the cutting device body is adjustable, the fusing response temperature of the hot melt ring is adjustable, and the response is sensitive and reliable; the hot melt ring fusing pipe cutting belongs to the passive triggering type pipe cutting, manual operation is not needed, the pipe cutting position is located near the flame working face in the underground coal gasification furnace, the gasification agent can be directly provided for the flame working face nearby, the gasification agent injection position is accurate, convenience and reliability are achieved, and the purpose of providing the gasification agent for the underground coal gasification flame working face safely, continuously and stably is achieved.
A pipeline cutting method for realizing movable gas injection of underground coal gasification comprises the following steps:
s1: parameter determination
The size parameters of the hot melt ring 9, the connecting ring 10, the snap ring 7 and the high temperature resistant spring 8 which are required to be selected are determined according to the specification and the size of the gas injection pipe in the underground coal gasification furnace. The hot melt ring 9 and the connecting ring 10 need to be internally threaded, so the outer diameter of the hot melt ring is slightly larger than the outer diameter of the gas injection pipe sections 5 and 6, and the threaded connection part is ensured to have enough strength; the snap ring 7 and the high-temperature resistant spring 8 are required to be nested inside the gas injection pipe at the junction of the hot-melt ring 9 and the gas injection pipe sections 5, 6, and therefore have an outer diameter slightly smaller than the inner diameter of the gas injection pipe sections 5, 6. The elasticity of the spring 8 is ensured to ensure that the spring 8 in a compressed state can push the previous pipeline away for a certain distance after the hot melting ring 9 is melted, so as to form a gas injection port with a sufficient opening.
S2: the device is installed in the gas injection drill hole 3
In order to meet the requirements of underground coal mine roadway transportation and installation of gas injection pipe sections 5 and 6 in a gas injection drill hole 3 of an underground gasification furnace, the cutting device and the gas injection pipe are made into a sectionalized combined pipeline, and a single-section combined pipeline comprises two sections of gas injection pipe sections 5 and 6, a section of hot melting ring 9, a section of connecting ring 10, two clamping rings 7 and a high-temperature-resistant spring 8. The length of the single-section combined pipeline meets the requirements of underground roadway transportation of a coal mine, and meanwhile meets the requirements of sectional installation in a gas injection drill hole 3 in the underground coal gasification furnace; two adjacent combined pipelines are connected together through threads and are directly installed in a gas injection drill hole 3 in the underground coal gasification furnace through a drilling machine.
S3: operation and operation of gasification furnace
During the normal operation of the underground coal gasification furnace, the passive triggering type interval fusing method pipeline provided by the invention provides a gasifying agent for the flame working surface 2 of the underground coal gasification furnace, the flame working surface 2 moves along with the progress of underground gasification combustion and reaction, when the pipeline moves to the position of the hot melting ring 9, the hot melting ring 9 is continuously subjected to the high-temperature heat action of the flame working surface 2, the hot melting ring 9 starts to melt after reaching the melting point of the hot melting ring 9, when the hot melting ring 9 is partially melted through, the gasifying agent flows out, and the chemical reaction heat release under the action of oxygen accelerates the melting through of the hot melting ring 9; when the connecting force of the hot melting ring 9 is smaller than the elastic force of the spring 8 in a compressed state, the gas injection pipe sections 5 and 6 are completely disconnected at the position of the hot melting ring 9, the pipeline is cut off, a new gasification agent injection port is formed, and the new injection port provides the gasification agent for the combustion and gasification reaction processes of the flame working surface 2.
Similarly, with the continuous supply of the gasification agent by the injection port, the position of the underground coal gasification flame working face 2 continuously moves, when the injection port moves to the next hot melting ring 9 position, the hot melting ring 9 fusion → the accelerated oxygen flow fusion → the connecting force of the hot melting ring 9 is smaller than the elastic force of the spring 8, the pipeline is flicked → the pipeline is cut off, a new gasification agent injection port is formed → the new injection port provides the gasification agent for the combustion and gasification reaction process of the flame working face 2, and the like.
Compared with the prior art, the pipeline cutting device and method for the underground coal gasification mobile gas injection have the advantages that:
1. the single-section combined pipelines can be assembled, are connected by threads, can be conveniently and directly installed in the gas injection drill hole in the underground coal gasification furnace, and do not need to be provided with a drill hole protective pipe;
2. the cutting device is suitable for gas injection pipes with different pipe diameters, and has simple structure and convenient combination;
3. the installation space of the cutting device body is adjustable, the fusing response temperature of the hot melt ring is adjustable, and the response is sensitive and reliable;
4. the hot melt ring fusing pipe cutting belongs to a passive triggering type pipe cutting, manual operation is not needed, the pipe cutting position is located close to the flame working face in the underground coal gasification furnace, the gasification agent can be directly provided for the flame working face nearby, the injection position of the gasification agent is accurate, convenience and reliability are achieved, and the purpose of providing the gasification agent for the underground coal gasification flame working face safely, continuously and stably is achieved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A pipeline cutting device for realizing movable gas injection of underground coal gasification, which is used by matching with a gas injection drill hole reserved at the bottom of a coal layer, it is characterized by comprising a gas pipe which is positioned in the gas injection drill hole and is formed by connecting a plurality of gas injection pipe sections, every two adjacent gas injection pipe sections form a group of gas injection pipes, each group of gas injection pipes are fixedly connected through a connecting ring, the middle of each two gas injection pipe sections is connected through a cutting device body, the cutting device body consists of a snap ring, a high-temperature resistant spring and a hot melting ring, the snap ring is respectively arranged on the inner walls of the gas injection pipe sections at the left side and the right side of the cutting device body, a high-temperature resistant spring in a compressed state is abutted between the clamping rings, the gas injection pipe sections provided with the clamping rings are fixedly connected through the hot melting rings, when the flame working surface reaches the hot-melting ring, a new gas injection hole is formed after the hot-melting ring is disconnected, and a gasification agent is provided for gasification reaction through a new gas injection port.
2. The device for cutting off the pipeline for realizing the mobile gas injection of the underground coal gasification, according to the claim 1, is characterized in that the cutting-off device bodies are arranged in the whole gas injection drill hole at equal intervals according to the combustion moving speed of a flame working surface.
3. The device for cutting off the pipeline for realizing the mobile gas injection for the underground coal gasification as claimed in claim 1, wherein the hot melting ring is made of aluminum magnesium alloy with the melting point of 650 ℃.
4. The device for cutting off the pipeline for realizing the mobile gas injection of the underground coal gasification as claimed in claim 1, wherein both ends of the gas injection pipe are provided with threads, are in threaded connection with the connecting ring and maintain the gas tightness of the connection part.
5. The device for cutting off the pipeline for realizing the mobile gas injection of the underground coal gasification, according to claim 4, is characterized in that two ends of the hot melt ring are connected with the adjacent gas injection pipe sections through threads, and the gas tightness of the connection part is maintained.
6. The device for cutting off the pipeline for realizing the mobile gas injection of the underground coal gasification, according to claim 1, wherein the snap ring is a metal ring which is embedded and welded on the inner wall of the gas injection pipe section and plays a role in fixing the position of the high-temperature-resistant spring.
7. The pipeline cutting device for realizing the mobile gas injection for the underground coal gasification of the claim 1, wherein the high temperature resistant spring is a high temperature resistant and high strength spring embedded in the joint of the hot melt ring and the gas injection pipe section, and both ends of the high temperature resistant spring are clamped at the position of the snap ring and are in a compressed state after being installed; after the hot melting ring is melted to a melting point, the spring in a compressed state pushes the gas injection pipe sections at the two ends away under the action of elastic force, and the gas pipe is cut off, so that the purpose of providing a new gasification agent injection opening is achieved.
8. The pipeline cutting device for realizing the mobile gas injection of the underground coal gasification, according to claim 5, is characterized in that the inner diameters of the hot melt ring and the connecting ring are larger than the outer diameter of the gas injection pipe section, the inner walls of the hot melt ring and the connecting ring are provided with threads, and the outer wall of the gas injection pipe section is provided with threads.
9. The device for cutting off the pipeline for realizing the mobile gas injection of the underground coal gasification as claimed in claim 1, wherein the pipe diameter of the gas pipe ranges from DN80 to DN600, and the diameter of the gas pipe is 60-90mm smaller than the gas injection drill hole.
10. A method for cutting off a pipeline for realizing mobile gas injection in underground coal gasification, which is applied to the pipeline cutting-off device for realizing mobile gas injection in underground coal gasification in any one of claims 1 to 9, and comprises the following steps:
s1: parameter determination
Determining size parameters of a hot melt ring, a connecting ring, a clamping ring and a high-temperature resistant spring which need to be selected according to the specification and the size of a gas injection pipe in the underground coal gasification furnace;
s2: the device is installed in the gas injection drill hole
In order to meet the requirements of underground coal mine roadway transportation and installation of an air injection pipe in an air injection drill hole of an underground gasification furnace, a cutting device body and the air injection pipe are made into a sectionalized combined pipeline, a single-section combined pipeline comprises two sections of air injection pipe sections, a section of hot melting ring, a section of connecting ring, two clamping rings and a high-temperature resistant spring, the length of the single-section combined pipeline meets the requirements of underground coal mine roadway transportation, and meanwhile meets the requirements of sectionalized installation in the air injection drill hole in the underground coal gasification furnace, two adjacent sections of combined pipelines are connected together through threads and are directly installed in the air injection drill hole in the underground coal gasification furnace through a drilling machine;
s3: operation and operation of gasification furnace
During the normal operation of the underground coal gasification furnace, the gas pipe provides gasification agents for the flame working surface of the underground coal gasification furnace, the flame working surface moves along with the progress of underground gasification combustion and reaction, when the underground coal gasification furnace moves to the position of the hot melt ring, the hot melt ring continuously receives the high-temperature heat action of the flame working surface, the hot melt ring starts to melt after reaching the melting point of the hot melt ring, after the hot melt ring is partially melted through, the gasification agents flow out, and the heat release of chemical reaction under the action of oxygen accelerates the melting through of the hot melt ring; when the connecting force of the hot melting ring is smaller than the elastic force of the spring in a compressed state, the gas injection pipe is completely disconnected at the hot melting ring, the pipeline is cut off, a new gasification agent injection port is formed, and a gasification agent is provided for the combustion and gasification reaction process of the flame working surface through the new injection port.
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| CN1112188A (en) * | 1995-03-15 | 1995-11-22 | 柴兆喜 | Gasifying method for coal seam |
| US20160123128A1 (en) * | 2013-06-26 | 2016-05-05 | ENN Coal Gasification Mining Co., Ltd. | Gas injection apparatus with controllable gas injection point, gas injection process, and gasification method |
| CN107387055A (en) * | 2017-09-18 | 2017-11-24 | 山东科技大学 | A kind of mobile gas injection device and method suitable for underground coal gasification(UCG) |
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