An in-situ gasification and pyrolysis self-ignition heater for underground energy

Abstract

This invention discloses an in-situ gasification and pyrolysis self-ignition heater for underground energy, comprising a fixed sleeve, which is fixedly connected to the upper end of a continuous cable pipe, the lower end of the continuous cable pipe is fixedly connected to the upper end of a shell, the lower end of the shell is fixedly connected to the upper end of an electronic component chamber, and the lower end of the electronic component chamber is fixedly connected to the upper end of a gas mixing chamber; a main oxygen pipe is axially arranged inside the continuous cable pipe and the shell, extending to the lower end of the gas mixing chamber; an annular cavity is provided between the continuous cable pipe and the main oxygen pipe, and an annular cavity is provided between the main oxygen pipe and the shell; the annular cavities between the continuous cable pipe and the main oxygen pipe and between the main oxygen pipe and the shell are connected; a gas and cooling water inlet pipe is connected to an oxygen and cooling water outlet pipe in the gas mixing chamber; the gas and cooling water inlet pipe supplies gas when the gas mixture in the gas mixing chamber does not meet the combustion requirements, and the oxygen and cooling water outlet pipe supplies oxygen when the gas mixture does not meet the combustion requirements.

Description

Technical Field

[0001] This invention belongs to the field of in-situ extraction of underground energy, specifically relating to an in-situ gasification and pyrolysis self-ignition heater for underground energy. Background Technology

[0002] The extraction methods for underground energy are mainly divided into excavation extraction and in-situ extraction. Excavation extraction typically involves digging energy out of the ground and then processing and utilizing it. This method requires completely removing the energy from the ground, thus incurring significant costs for excavation, transportation, and processing. Furthermore, excavation extraction can damage the underground environment. In contrast, in-situ extraction involves extracting energy without completely removing it from the ground. This is usually done by injecting heat, chemicals, or other substances into the underground target to convert the energy into a harvestable form. The advantage of in-situ extraction is that it reduces transportation and processing costs while avoiding damage to the underground environment. With my country's increasing emphasis on energy environmental protection, clean and environmentally friendly in-situ extraction is receiving more and more attention. Currently, there are many technologies used for in-situ extraction of underground energy, such as heating (combustion) extraction, microbial extraction technology, chemical reagent extraction technology, and hydraulic fracturing extraction technology. Among these, heating extraction technology directly heats underground energy sources such as oil shale and coal, causing them to crack or burn underground, and the generated energy is extracted through production wells. Heating methods for underground coalbed methane extraction include electric heating and fluid heating. However, electric heating is slow, has high heat loss, and is costly. While fluid heating is faster, excessively high fluid flow rates can lead to short circuits, and heat exchange between underground energy and the fluid is limited. Currently, there is a need for a technology that can meet the requirements of in-situ underground extraction with high energy utilization and safety stability. To address this, Jilin University proposed a "Multi-channel Continuous Pipe Ignition System for Underground Coalbed Methane Gasification" (patent number CN202022910950.1). The multi-channel continuous pipe ignition system described in the paper can achieve the following two functional requirements: ① efficient heating and ignition of underground energy; ② ensuring the heating device maintains normal operation in the high-temperature underground environment. However, the above-mentioned ignition heating system still has the following three shortcomings: ① The lack of an oxygen and fuel gas mixing chamber results in extremely uneven and difficult-to-control mixing of oxygen and fuel gas, easily leading to underground heating ignition failure or explosion; ② The cooling pipe and combustion-supporting pipe are designed independently, increasing the difficulty and cost of cable conduit manufacturing; ③ The flow rate of atomized water entering the combustion zone is difficult to control remotely, making temperature regulation in the combustion zone challenging.

[0003] To address the aforementioned issues, an in-situ gasification and pyrolysis self-ignition heater for underground energy is proposed. By innovating the structure of the gas mixing chamber and optimizing the gas and cooling water paths using normally open and normally closed electromagnetic switches, the heating and ignition accuracy of underground energy is improved, the safety factor is enhanced, and the engineering cost and construction difficulty are reduced. Summary of the Invention

[0004] This invention proposes an in-situ gasification and pyrolysis self-ignition heater for underground energy, which aims to control the uniform mixing and ratio of oxygen and fuel gas to avoid underground heating and ignition failure. It can also improve the control and accuracy of atomized water flow rate, and realize the heating or ignition of underground energy and real-time monitoring of the temperature of the combustion zone.

[0005] An in-situ gasification and pyrolysis self-ignition heater for underground energy includes a fixed sleeve, an ignition cable, a gas and cooling water inlet insulated long pipe, an oxygen and cooling water outlet long pipe, a normally open electromagnetic switch control cable, a normally closed electromagnetic switch control cable, a data transmission cable, a main oxygen pipeline, a continuous cable conduit, a housing, an electronic component chamber, a gas mixing chamber, a thermocouple sensor, two normally open electromagnetic switches, an ignition electrode, a normally closed electromagnetic switch, an oxygen and cooling water outlet pipe, and a gas and cooling water inlet pipe.

[0006] The fixed sleeve is fixedly connected to the upper end of the continuous cable pipe, the lower end of the continuous cable pipe is fixedly connected to the upper end of the outer shell, the lower end of the outer shell is fixedly connected to the upper end of the electronic component chamber, and the lower end of the electronic component chamber is fixedly connected to the upper end of the gas mixing chamber.

[0007] The continuous cable tube and the outer shell are provided with a main oxygen pipe that extends through the lower end of the gas mixing chamber in the axial direction. There is an annular cavity between the continuous cable tube and the main oxygen pipe, and there is an annular cavity between the main oxygen pipe and the outer shell. The annular cavity between the continuous cable tube and the main oxygen pipe and the annular cavity between the main oxygen pipe and the outer shell are connected.

[0008] The gas mixing chamber is equipped with a flame-spraying pipe, and the lower end face of the gas mixing chamber is equipped with multiple flame-spraying holes, which are connected to the flame-spraying pipe.

[0009] The gas and cooling water inlet insulated long pipe and the gas and cooling water inlet pipe pass through the annular cavity and are connected in the gas mixing chamber by a normally open electromagnetic switch.

[0010] The oxygen and cooling water outlet pipes are connected to the gas mixing chamber via another normally open electromagnetic switch after passing through the annular cavity.

[0011] The gas and cooling water inlet pipes are connected to the oxygen and cooling water outlet pipes in the gas mixing chamber. When the gas mixture in the gas mixing chamber does not meet the combustion requirements, the gas and cooling water inlet pipes supply gas. When the gas mixture meets the combustion requirements, the gas and cooling water inlet pipes are closed by a normally open electromagnetic switch, and then the gas and cooling water inlet pipes are opened to supply cooling water. When the gas mixture does not meet the combustion requirements, the oxygen and cooling water outlet pipes supply oxygen. When the gas mixture meets the combustion requirements, the oxygen and cooling water outlet pipes are closed by a normally open electromagnetic switch, and then the oxygen and cooling water outlet pipes are opened to discharge cooling water.

[0012] Two normally open electromagnetic switches are connected and controlled by a normally open electromagnetic switch control cable that passes through the annular cavity.

[0013] The gas mixing chamber is equipped with two thermocouple sensors, and a data transmission cable passes through the annular cavity and the electronic component chamber to connect to the thermocouple sensors;

[0014] The ignition electrode is embedded in the lower end face of the gas mixing chamber, and the ignition cable passes through the annular cavity, the electronic component chamber and the gas mixing chamber and is connected to the ignition electrode.

[0015] The normally closed electromagnetic switch is connected between the gas mixing chamber and the ignition pipe; the control cable of the normally closed electromagnetic switch passes through the annular cavity and the electronic component chamber and is connected to the normally closed electromagnetic switch; the function of the normally closed electromagnetic switch is to control the mixing ratio of gas and oxygen in the gas mixing chamber and to control the spraying of cooling water; when the mixing ratio reaches the combustion requirements, the ignition pipe is opened, allowing the mixed gas to contact the ignition electrode through the ignition hole, thereby igniting the gas; after the underground energy is ignited, the normally closed electromagnetic switch closes the ignition channel; when it is necessary to spray atomized water for cooling, the ignition pipe is opened during the cooling water circulation, allowing the cooling water to be sprayed out from the ignition hole.

[0016] The beneficial effects of this invention are:

[0017] The system is designed with a gas mixing chamber, electronic component chamber, ignition electrode, gas and cooling water inlet pipes, oxygen and cooling water outlet pipes, normally open electromagnetic switches, normally closed electromagnetic switches, insulated long pipes for gas and cooling water inlets, long pipes for oxygen and cooling water outlets, main oxygen pipeline, thermocouple sensors, ignition cables, normally open electromagnetic switch control cables, normally closed electromagnetic switch control cables, data transmission cables, and a housing. It utilizes electric ignition technology to ignite the introduced mixed combustible gas, thereby igniting the coal seam. The equipped thermocouple sensors can monitor temperature changes in the combustion zone in real time, effectively determining whether the coal seam has ignited and its combustion state. Through circulating cooling water and sprayed atomized water, the heat transferred from the combustion zone to the system can be effectively removed, ensuring that the system temperature remains within the normal operating range. The normally open and normally closed electromagnetic switches, in conjunction with the gas mixing chamber, can adjust the gas-oxygen mixing ratio and optimize the gas and cooling water paths, allowing cooling water and gas to share a single pipeline, saving costs, reducing cable fabrication difficulty, and improving the accuracy of atomized water flow control. The insulated long pipes for gas and cooling water inlets can effectively prevent the cooling water from getting too hot before entering the gas mixing chamber. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0019] Figure 2 This is a top view of the present invention.

[0020] Figure 3 This is a bottom view of the present invention.

[0021] Figure 4 This is a top view of the electronic component compartment of the present invention.

[0022] Figure 5 This is a top view of the gas mixing chamber of the present invention.

[0023] Figure 6 This is an overall axial sectional view of the present invention.

[0024] Figure 7 This is an axial sectional view of the gas mixing chamber of the present invention.

[0025] Figure 8 This is a schematic diagram of the gas and liquid flow during the gas mixing stage of this invention.

[0026] Figure 9 This is a schematic diagram of gas and liquid flow during the cooling water circulation stage of the present invention.

[0027] Figure 10 This is a schematic diagram of the gas and liquid flow during the atomized water cooling stage of the present invention. Detailed Implementation

[0028] Please refer to Figures 1 to 10 As shown, an underground energy in-situ gasification and pyrolysis self-ignition heater includes a fixed sleeve 1, an ignition cable 2, a gas and cooling water inlet insulated long pipe 3, an oxygen and cooling water outlet long pipe 4, a normally open electromagnetic switch control cable 5, a normally closed electromagnetic switch control cable 6, a data transmission cable 7, a main oxygen pipeline 8, a continuous cable conduit 9, an outer shell 10, an electronic component chamber 11, a gas mixing chamber 12, a thermocouple sensor 13, two normally open electromagnetic switches 14, an ignition electrode 15, a normally closed electromagnetic switch 16, an oxygen and cooling water outlet pipe 17, and a gas and cooling water inlet pipe 18.

[0029] The fixed sleeve 1 is fixedly connected to the upper end of the continuous cable pipe 9, the lower end of the continuous cable pipe 9 is fixedly connected to the upper end of the outer shell 10, the lower end of the outer shell 10 is fixedly connected to the upper end of the electronic component chamber 11, and the lower end of the electronic component chamber 11 is fixedly connected to the upper end of the gas mixing chamber 12.

[0030] The continuous cable duct 9 and the outer shell 10 are provided with a main oxygen pipe 8 in the axial direction, which extends to the lower end of the gas mixing chamber 12. An annular cavity 19 is provided between the continuous cable duct 9 and the main oxygen pipe 8, and an annular cavity 19 is provided between the main oxygen pipe 8 and the outer shell 10. The annular cavity 19 between the continuous cable duct 9 and the main oxygen pipe 8 and the annular cavity 19 between the main oxygen pipe 8 and the outer shell 10 are connected. The function of the main oxygen pipe 8 is to provide oxygen for the combustion of underground energy.

[0031] The gas mixing chamber 12 is provided with a flame-spraying pipe 121, and the lower end face of the gas mixing chamber 12 is provided with a plurality of flame-spraying holes 120, which are connected to the flame-spraying pipe 121.

[0032] The gas and cooling water inlet insulated long pipe 3 and the gas and cooling water inlet pipe 18 pass through the annular cavity 19 and are connected in the gas mixing chamber 12 by a normally open electromagnetic switch 14. The function of the gas and cooling water inlet insulated long pipe 3 and the gas and cooling water inlet pipe 18 is to transport gas and cooling water. The gas and cooling water inlet insulated long pipe 3 can also reduce the temperature loss of cooling water.

[0033] The oxygen and cooling water outlet pipe 4 and the oxygen and cooling water outlet pipe 17 pass through the annular cavity 19 and are connected in the gas mixing chamber 12 by another normally open electromagnetic switch 14; the function of the oxygen and cooling water outlet pipe 4 and the oxygen and cooling water outlet pipe 17 is to transport oxygen and discharge cooling water.

[0034] The gas and cooling water inlet pipe 18 and the oxygen and cooling water outlet pipe 17 are connected in the gas mixing chamber 12. When the gas mixture in the gas mixing chamber 12 does not meet the combustion requirements, the gas and cooling water inlet pipe 18 is supplied with gas. When the gas mixture meets the combustion requirements, the gas and cooling water inlet pipe 18 is closed by the normally open electromagnetic switch 14, and then the gas and cooling water inlet pipe 18 is opened to supply cooling water. When the gas mixture does not meet the combustion requirements, the oxygen and cooling water outlet pipe 17 is supplied with oxygen. When the gas mixture meets the combustion requirements, the oxygen and cooling water outlet pipe 17 is closed by the normally open electromagnetic switch 14, and then the oxygen and cooling water outlet pipe 17 is opened to discharge cooling water.

[0035] Two normally open electromagnetic switches 14 are connected and controlled by a normally open electromagnetic switch control cable 5 passing through the annular cavity 19;

[0036] The gas mixing chamber 12 is equipped with two thermocouple sensors 13. The data transmission cable 7 passes through the annular cavity 19 and the electronic component chamber 11 and is connected to the thermocouple sensors 13. The thermocouple sensors 13 can monitor the temperature change of the combustion zone in real time, thereby determining the gasification or cracking of underground energy.

[0037] The ignition electrode 15 is embedded in the lower end face of the gas mixing chamber 12. The ignition cable 2 passes through the annular cavity 19, the electronic component chamber 11 and the gas mixing chamber 12 and is connected to the ignition electrode 15. The function of the ignition cable 2 is to carry high voltage current. The function of the ignition electrode 15 is that the high voltage current reaches the ignition electrode 15 through the ignition cable 2, and sparks are generated between the center electrode and the side electrode of the ignition electrode 15, thereby generating a strong electric spark.

[0038] The normally closed electromagnetic switch 16 is connected between the gas mixing chamber 12 and the ignition pipe 121. The normally closed electromagnetic switch control cable 6 passes through the annular cavity 19 and the electronic component chamber 11 and is connected to the normally closed electromagnetic switch 16. The function of the normally closed electromagnetic switch 16 is to control the mixing ratio of gas and oxygen in the gas mixing chamber 12 and to control the spraying of cooling water. When the mixing ratio reaches the combustion requirement, the ignition pipe 121 is opened, allowing the mixed gas to contact the ignition electrode 15 through the ignition hole 120, thereby igniting the gas. After the underground energy is ignited, the normally closed electromagnetic switch 16 closes the ignition channel. When it is necessary to spray atomized water for cooling, the ignition pipe 121 is opened during the cooling water circulation, allowing the cooling water to be sprayed out from the ignition hole 120.

[0039] Furthermore, there are two thermocouple sensors 13, one of which is embedded in the lower end face of the gas mixing chamber 12, and the other is fixed inside the gas mixing chamber 12.

[0040] Furthermore, the lower end of the gas mixing chamber 12 is a hollow hemispherical structure with flame holes 120 on its surface.

[0041] Furthermore, the ignition electrode 15 is disposed at the flame hole 120.

[0042] Furthermore, the flame-spraying pipe 121 is annular.

[0043] The working principle and usage process of this invention patent:

[0044] Once the system reaches the designated area, the gas mixing stage begins. Gas B is supplied through the gas and cooling water inlet insulated pipe 3. The normally open electromagnetic switch 14 connects the gas and cooling water inlet insulated pipe 3 to the gas and cooling water inlet pipe 18. Oxygen A is supplied through the oxygen and cooling water outlet inlet pipe 4. The normally open electromagnetic switch 14 connects the oxygen and cooling water outlet inlet pipe 4 to the oxygen and cooling water outlet pipe 17. During this time, the normally closed electromagnetic switch 16 remains closed on the flame-jet pipe 120. Once the gas and oxygen mixture meets combustion requirements, the normally open electromagnetic switch 14 closes the channel, and the normally closed electromagnetic switch 16 opens the flame-jet pipe 121, ejecting the mixed gas through the flame-jet hole 121 on the lower end face of the gas mixing chamber 12. The mixture is ignited by continuous electric ignition via ignition electrode 15. Two thermocouple sensors 13 monitor the temperature inside the gas mixing chamber 12 and the outside temperature in real time. Once the underground energy is determined to be burning, the cooling water circulation stage begins. The normally closed electromagnetic switch 16 closes the flame-jet pipe, and the gas and cooling water inlet insulated pipe 3 supplies cooling water C. The normally open electromagnetic switch 14 connects the gas and cooling water inlet insulated pipe 3 with the gas and cooling water inlet pipe 18, and the oxygen and cooling water outlet inlet pipe 4 discharges cooling water C. The normally open electromagnetic switch 14 also connects the oxygen and cooling water outlet inlet pipe 4 with the oxygen and cooling water outlet pipe 17. The cooling water C continuously circulates within the gas mixing chamber 12, carrying away heat. When it is determined that atomized water cooling is needed, the atomized water cooling stage begins. The normally closed electromagnetic switch 16 opens the flame-jet pipe 120, allowing the cooling water C to be sprayed out through the flame-jet pipe 120 and the flame-jet hole 121 to form atomized water D. Throughout the process, the main oxygen pipeline 8 delivers oxygen A. After the underground energy is determined to be ignited, cooling water C is continuously circulated to promptly remove the heat transferred from the combustion zone to the system, keeping its own temperature within the normal operating temperature range and preventing it from melting and failing under high-temperature working conditions.

Claims

1. A self-igniting heater for in-situ gasification and pyrolysis of underground energy, characterized in that: Includes a fixed sleeve (1), ignition cable (2), gas and cooling water inlet heat-insulated long pipe (3), oxygen and cooling water outlet long pipe (4), normally open electromagnetic switch control cable (5), normally closed electromagnetic switch control cable (6), data transmission cable (7), main oxygen pipeline (8), continuous cable conduit (9), outer shell (10), electronic component room (11), gas mixing chamber (12), thermocouple sensor (13), two normally open electromagnetic switches (14), ignition electrode (15), normally closed electromagnetic switch (16), oxygen and cooling water outlet pipe (17), and gas and cooling water inlet pipe (18); The fixed sleeve (1) is fixedly connected to the upper end of the continuous cable pipe (9), the lower end of the continuous cable pipe (9) is fixedly connected to the upper end of the outer shell (10), the lower end of the outer shell (10) is fixedly connected to the upper end of the electronic component chamber (11), and the lower end of the electronic component chamber (11) is fixedly connected to the upper end of the gas mixing chamber (12). The continuous cable tube (9) and the outer shell (10) are provided with a main oxygen pipe (8) that extends through to the lower end of the gas mixing chamber (12) in the axial direction. An annular cavity (19) is provided between the continuous cable tube (9) and the main oxygen pipe (8). An annular cavity (19) is provided between the main oxygen pipe (8) and the outer shell (10). The annular cavity (19) between the continuous cable tube (9) and the main oxygen pipe (8) and the annular cavity (19) between the main oxygen pipe (8) and the outer shell (10) are connected. The gas mixing chamber (12) is provided with a flame-spraying pipe (121), and the lower end face of the gas mixing chamber (12) is provided with a plurality of flame-spraying holes (120), which are connected to the flame-spraying pipe (121); The gas and cooling water inlet insulated long pipe (3) and the gas and cooling water inlet pipe (18) pass through the annular cavity (19) and are connected in the gas mixing chamber (12) by a normally open electromagnetic switch (14); The oxygen and cooling water outlet pipe (4) and the oxygen and cooling water outlet pipe (17) pass through the annular cavity (19) and are then connected in the gas mixing chamber (12) by another normally open electromagnetic switch (14). The gas and cooling water inlet pipe (18) and the oxygen and cooling water outlet pipe (17) are connected in the gas mixing chamber (12); the gas and cooling water inlet pipe (18) supplies gas when the gas mixture in the gas mixing chamber (12) does not meet the combustion requirements, and when the gas mixture meets the combustion requirements, it is controlled by the normally open electromagnetic switch (14) to close the gas and cooling water inlet pipe (18), and then opens the gas and cooling water inlet pipe (18) to supply cooling water; the oxygen and cooling water outlet pipe (17) supplies oxygen when the gas mixture does not meet the combustion requirements, and when the gas mixture meets the combustion requirements, it is controlled by the normally open electromagnetic switch (14) to close the oxygen and cooling water outlet pipe (17), and then opens the oxygen and cooling water outlet pipe (17) to discharge cooling water; Two normally open electromagnetic switches (14) are connected and controlled by a normally open electromagnetic switch control cable (5) passing through the annular cavity (19); The gas mixing chamber (12) is equipped with two thermocouple sensors (13), and the data transmission cable (7) passes through the annular cavity (19) and the electronic component chamber (11) and is connected to the thermocouple sensors (13); The ignition electrode (15) is embedded in the lower end face of the gas mixing chamber (12), and the ignition cable (2) passes through the annular cavity (19), the electronic component chamber (11) and the gas mixing chamber (12) and is connected to the ignition electrode (15). The normally closed electromagnetic switch (16) is connected between the gas mixing chamber (12) and the flame-spraying pipe (121); the normally closed electromagnetic switch control cable (6) passes through the annular cavity (19), the electronic component chamber (11) and is connected to the normally closed electromagnetic switch (16); the function of the normally closed electromagnetic switch (16) is to control the mixing ratio of gas and oxygen in the gas mixing chamber (12) and to control the spraying of cooling water; when the mixing ratio reaches the combustion requirement, the flame-spraying pipe (121) is opened, so that the mixed gas comes into contact with the ignition electrode (15) through the flame-spraying hole (120), thereby igniting the gas; after the underground energy is ignited, the normally closed electromagnetic switch (16) closes the ignition channel; when it is necessary to spray atomized water to cool down, the flame-spraying pipe (121) is opened during the cooling water circulation, so that the cooling water is sprayed out from the flame-spraying hole (120).

2. The underground energy in-situ gasification and pyrolysis self-ignition heater according to claim 1, characterized in that: The number of thermocouple sensors (13) is two. One thermocouple sensor (13) is embedded in the lower end face of the gas mixing chamber (12), and the other thermocouple sensor (13) is fixed in the gas mixing chamber (12).

3. The underground energy in-situ gasification and pyrolysis self-ignition heater according to claim 1, characterized in that: The lower end of the gas mixing chamber (12) is a hollow hemispherical structure with flame holes (120) on its surface.

4. The underground energy in-situ gasification and pyrolysis self-ignition heater according to claim 1, characterized in that: The ignition electrode (15) is located at the flame hole (120).

5. The underground energy in-situ gasification and pyrolysis self-ignition heater according to claim 1, characterized in that: The flame-spraying pipe (121) is annular.

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