A porous double-layer gas-cooled downhole high-temperature ignition tool
The multi-layered gas-cooled coal gasification tool addresses cooling inefficiencies by using low-temperature air to form protective gas films, enhancing tool reliability and stability in high-temperature environments.
Patent Information
- Application Number
- CN202310852855.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-12
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2043-07-12
AI Technical Summary
Due to the structural limitations of the cooling water cooling system, traditional downhole high-temperature ignition tools cannot be effectively cooled, resulting in tool ablation problems, poor use reliability, and it is difficult to work reliably in high temperature environments up to 1700℃.
A porous double-layer air-cooled structure is adopted, and low-temperature oxygen is used as a cooling medium. By forming a cooling air film on the inner cavity and outer surface of the ignition tool shell, the working temperature is reduced.
Reliable work is achieved at 1800°C, which improves the reliability of the tool and prevents ablation. It is suitable for engineering applications of coal in-situ vaporization technology.
Smart Images
Figure CN116951457B_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of in-situ coal gasification, and particularly relates to a porous double-layer air-cooled downhole high-temperature ignition tool. Background Art
[0002] As a new technology for exploiting underground coal resources, the in-situ coal gasification technology can not only exploit deep coal resources, but also exploit inclined coal resources that are difficult to exploit by conventional underground mining methods, greatly improving the utilization rate of coal resources, reducing the labor intensity of workers, reducing environmental damage and air pollution, and coupling CCUS to efficiently produce clean fuels. It has good economic, safety and environmental benefits, and is an important research and development direction of clean coal technology in China.
[0003] Therefore, a large number of research on industrial technology models of underground coal gasification have been carried out. The research shows that developing the downhole high-temperature tool, carbon dioxide separation and utilization in combination with China's coal quality conditions, and exploring the research of injecting carbon dioxide back into the underground gasification furnace for re-reduction to improve the effective components of the output gas, so as to truly achieve "high efficiency, clean and low-carbon", is an important way for the in-situ coal gasification technology to achieve engineering application. Therefore, the reliability of the downhole high-temperature ignition tool is crucial, which directly determines whether the in-situ coal gasification technology can achieve engineering application. The downhole high-temperature ignition tool works in the coal combustion area, with a high working temperature, up to 1700 °C, far exceeding the upper limit of the use of conventional superalloys. The traditional downhole ignition tool mainly cools the ignition tool with cooling water. Due to the limitations of the cooling water cooling system structure, it cannot cool the downhole high-temperature ignition tool well, resulting in ablation problems of the ignition tool and poor reliability in use. Therefore, developing an efficient active thermal protection for the downhole high-temperature ignition tool to reduce its working temperature is an effective technical way to solve its reliability in use. Summary of the Invention
[0004] In order to solve the above problems, the present invention aims to provide a porous double-layer air-cooled downhole high-temperature ignition tool.
[0005] To achieve the above object, the present invention adopts the following technical solution: A porous double-layer air-cooled downhole high-temperature ignition tool, including an ignition tool housing, an installation edge is provided on the ignition tool housing, an oxygen delivery pipe is connected in the middle of the installation edge, an electric ignition rod, a combustion aid delivery pipe, a vaporized water delivery pipe and a thermocouple installation sleeve are installed on the circumference of the oxygen delivery pipe and penetrate through to the ignition tool housing, and an ignition rod sleeve is sleeved on the outer end of the electric ignition rod.
[0006] A double-layer cooling interlayer is arranged in the inner cavity of the ignition tool housing. The ignition rod sleeve is communicated with the cooling cavity of the inner cavity of the ignition tool housing. Low-temperature air flows out from the gap between the ignition rod sleeve and the electric ignition rod, forming a protective gas film around the electric ignition rod. A number of cooling holes are opened on the surface of the ignition tool housing, and low-temperature oxygen jets out from the cooling holes to form a protective gas film. An air guiding air pocket is arranged inside the ignition tool housing to introduce the low-temperature air in the oxygen delivery pipe into the inner cavity, forming a cooling gas film on the outer surface of the housing.
[0007] The mounting edge is a disc, on which mounting holes corresponding to the electric ignition rod, the combustion promoter delivery pipe, the vaporized water delivery pipe, and the thermocouple mounting sleeve are provided.
[0008] The inner cavity of the ignition tool housing is provided with pipeline interfaces corresponding to the electric ignition rod, the combustion promoter delivery pipe, the vaporized water delivery pipe, the oxygen delivery pipe, and the thermocouple mounting sleeve.
[0009] The electric ignition rod, the combustion promoter delivery pipe, the vaporized water delivery pipe, and the thermocouple mounting sleeve pass through the corresponding mounting holes on the mounting edge and the inner cavity of the ignition tool housing, and are welded and fixed to the corresponding pipeline interfaces of the ignition tool housing.
[0010] The mounting edge is welded and fixed to the ignition tool housing, and the radius of the mounting edge is the same as the radius of the welding end of the ignition tool housing.
[0011] The number of the vaporized water delivery pipes is several.
[0012] The ignition rod sleeve is communicated with the cooling cavity of the ignition tool housing, and several cooling holes are opened in the cooling layer.
[0013] The electric ignition rod and the combustion promoter delivery pipe pass through the ignition tool housing to the outside.
[0014] Compared with the prior art, the present invention has the following advantages: The present invention makes full use of the existing resources of the engineering equipment of the in-situ coal gasification technology, uses low-temperature oxygen as the cooling medium, and proposes an ignition tool with a multi-functional integrated porous double-layer air-cooled cavity structure. An air guiding air pocket and cooling holes are opened in the inner cavity of the ignition tool housing to introduce the low-temperature air in the oxygen delivery pipe into the inner cavity, and the low-temperature air flows out from the cooling holes to take away the excess heat and form a cooling gas film on the outer surface of the housing, greatly reducing the working temperature. At the same time, the ignition rod sleeve is communicated with the inner cavity cooling cavity of the ignition tool, and the low-temperature air flows out from the gap between the ignition rod sleeve and the electric ignition rod, forming a protective gas film around the electric ignition rod, greatly reducing the working temperature, and can work reliably at 1800 °C. Description of the Drawings
[0015] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0016] Figure 1 is the axonometric view of the porous double-layer air-cooled downhole high-temperature ignition tool in the present invention;
[0017] Figure 2 is the right view of the porous double-layer air-cooled downhole high-temperature ignition tool in the present invention;
[0018] Figure 3 is Figure 2 the A-A cross-sectional view of
[0019] Figure 4 is Figure 2 the B-B cross-sectional view of
[0020] Figure 5 is Figure 2 the C-C cross-sectional view of
[0021] Figure 6 is the left view of the porous double-layer air-cooled downhole high-temperature ignition tool;
[0022] Figure 7 is the enlarged view of the electric ignition rod cooling structure of the porous double-layer air-cooled downhole high-temperature ignition tool Figure 1 ;
[0023] Figure 8 is the enlarged view of the porous double-layer cooling structure of the porous double-layer air-cooled downhole high-temperature ignition tool Figure 2 ;
[0024] In the figure, 1 - ignition rod casing; 2 - combustion promoter delivery pipe; 3 - electric ignition rod; 4 - ignition tool housing; 5 - vaporized water delivery pipe; 6 - oxygen delivery pipe; 7 - mounting edge; 8 - thermocouple mounting casing; 9 - air guide hood. Specific Embodiments
[0025] The following will further illustrate the present invention in combination with the drawings and specific embodiments. However, it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, all modifications, substitutions, and changes made according to the common general knowledge and conventional means in the art are included in the scope of the present invention.
[0026] Refer to Figures 1 - 8A porous double-layer air-cooled downhole high-temperature ignition tool, which includes an ignition rod casing 1, a combustion promoter delivery pipe 2, an electric ignition rod 3, an ignition tool housing 4, a vaporized water delivery pipe 5, an oxygen delivery pipe 6, a mounting edge 7, and a thermocouple mounting casing 8.
[0027] The oxygen delivery pipe 6 is fixed to the mounting edge 7 by welding. The electric ignition rod 3, the casing 1, the combustion promoter delivery pipe 2, the vaporized water delivery pipe 5, the oxygen delivery pipe 6, and the thermocouple mounting casing 8 first pass through the corresponding mounting holes on the mounting edge 7 and are then fixed to the corresponding pipeline interfaces of the ignition tool housing 4 by welding. Finally, the mounting edge 7 and the ignition tool housing 4 are fixed by welding.
[0028] The porous double-layer air-cooled downhole high-temperature ignition tool has multiple functions such as ignition, cooling, combustion promotion, vaporization gas displacement, backfire prevention, and monitoring. The ignition tool housing 4 is an integrated multi-functional porous double-layer air-cooled cavity structure with a complex structure composition. Its inner cavity is provided with a double-layer cooling sandwich, and a number of cooling holes with a diameter of 1 mm are opened on both the cooling layer and the outer surface of the inner cavity, with high cooling efficiency. Four air guide pockets are opened inside the ignition tool housing 4 to introduce the low-temperature air in the oxygen delivery pipe 6 into the inner cavity, which flows out from the cooling holes to take away the excess heat and form a cooling gas film on the outer surface of the housing, greatly reducing the working temperature and enabling reliable operation at 1800 °C.
[0029] The casing of the electric ignition rod 3 is communicated with the inner cavity cooling cavity of the ignition tool housing 4, and the low-temperature air flows out from the gap between the ignition rod casing 1 and the electric ignition rod 3 to form a protective gas film around the electric ignition rod 3, greatly reducing the working temperature and enabling reliable operation at 1800 °C.
[0030] There are 6 vaporized water delivery pipes 6 with an inner diameter of 1 mm, which deliver vaporized water to the coal seam for vaporization gas displacement. A number of cooling holes with a diameter of 1 mm are opened on the surface of the ignition tool housing 4, and the low-temperature oxygen jets out at high speed from the cooling holes to form a protective gas film to prevent the coal seam combustion flame from flowing back into the inner cavity of the ignition tool housing 4 and causing ablation.
[0031] Refer to Figure 1 and Figure 6 , the ignition rod casing 1 is located directly above, the combustion promoter delivery pipe 2 is located at a position 25° counterclockwise from the ignition rod casing 1, the thermocouple mounting casing 8 is located at a position 90° counterclockwise from the ignition rod casing 1, and the vaporized water delivery pipes 5 are located at positions 45°, 135°, 180°, 225°, 270°, and 315° counterclockwise from the ignition rod casing 1.
[0032] The above has introduced in detail a porous double-layer gas-cooled downhole high-temperature ignition tool provided by the present invention. Specific examples are used in this article to elaborate on the structure and working principle of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims
1. A porous double-layer air-cooled downhole high-temperature ignition tool, characterized in that: It includes an ignition tool housing (4), on which there is an installation edge (7). An oxygen delivery pipe (6) is connected in the middle of the installation edge (7). An electric ignition rod (3), a combustion promoter delivery pipe (2), a vaporized water delivery pipe (5) and a thermocouple installation sleeve (8) are installed on the circumference of the oxygen delivery pipe (6) and penetrate through to the ignition tool housing (4). An ignition rod sleeve (1) is sleeved on the outer end of the electric ignition rod (3). A double-layer cooling interlayer is arranged in the inner cavity of the ignition tool housing (4). The ignition rod sleeve (1) is communicated with the cooling cavity in the inner cavity of the ignition tool housing (4). Low-temperature air flows out from the gap between the ignition rod sleeve (1) and the electric ignition rod (3) to form a protective gas film around the electric ignition rod (3). A number of cooling holes are opened on the surface of the ignition tool housing (4), and low-temperature oxygen jets out from the cooling holes to form a protective gas film. An air guiding pocket (9) is arranged inside the ignition tool housing (4) to introduce the low-temperature air in the oxygen delivery pipe (6) into the inner cavity to form a cooling gas film on the outer surface of the housing.
2. The porous double-layer gas-cooled downhole high-temperature ignition tool according to claim 1, wherein: The installation edge (7) is a disc, on which there are installation holes corresponding to the electric ignition rod (3), the combustion promoter delivery pipe (2), the vaporized water delivery pipe (5) and the thermocouple installation sleeve (8).
3. The porous double-layer gas-cooled downhole high-temperature ignition tool according to claim 1, wherein: A pipeline interface corresponding to the electric ignition rod (3), the combustion promoter delivery pipe (2), the vaporized water delivery pipe (5), the oxygen delivery pipe (6) and the thermocouple installation sleeve (8) is arranged in the inner cavity of the ignition tool housing (4).
4. The porous double-layer air-cooled downhole high-temperature ignition tool according to claim 2 or 3, characterized in that: The electric ignition rod (3), the combustion promoter delivery pipe (2), the vaporized water delivery pipe (5) and the thermocouple installation sleeve (8) pass through the corresponding installation holes on the installation edge (7) and the inner cavity of the ignition tool housing (4) and are welded and fixed to the corresponding pipeline interfaces of the ignition tool housing (4).
5. The porous double-layer air-cooled downhole high-temperature ignition tool according to claim 1, characterized in that: The installation edge (7) is welded and fixed to the ignition tool housing (4), and the radius of the installation edge (7) is the same as the radius of the welding end of the ignition tool housing (4).
6. The porous double-layer air-cooled downhole high-temperature ignition tool according to claim 1, characterized in that: The number of the vaporized water delivery pipes (5) is several.
7. The porous double-layer gas-cooled downhole high-temperature ignition tool according to claim 1, wherein: The ignition rod sleeve (1) is communicated with the cooling cavity of the ignition tool housing (4), and a number of cooling holes are opened in the cooling layer of the ignition tool housing (4).
8. The porous double-layer air-cooled downhole high-temperature ignition tool according to claim 1, characterized in that: The electric ignition rod (3) and the combustion promoter delivery pipe (2) penetrate through the ignition tool housing (4) to the outside.
Citation Information
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