A Coalfield Fire Zone Thermal Energy Conversion Analysis System Based on Gravity Heat Pipe Control

Abstract

The present invention belongs to the technical field of thermal energy testing and recycling, and discloses a coalfield fire zone thermal energy conversion analysis system based on gravity heat pipe regulation, including a temperature rise control module for controlling the internal temperature of a coalfield fire zone simulation module, a thermal energy extraction module inserted into the coalfield fire zone simulation module, a temperature difference power generation module connected to the thermal energy extraction module, and a gas collection and analysis module for collecting and analyzing oxidizing gas in the coalfield fire zone simulation module. The present invention has a compact structure, high versatility and practicality, and can simulate and test coalfield fire zones under different conditions. The present invention is suitable for analyzing and studying the spontaneous combustion characteristics of coalfield fire zones in different fields.

Description

Technical Field

[0001] The invention belongs to the technical field of heat energy testing and recycling, and relates to the testing and analysis of the spontaneous combustion characteristics of coalfield fire areas. Specifically, it is a coalfield fire area heat energy conversion analysis system based on gravity heat pipe regulation. Background Art

[0002] Coalfield fire areas not only burn a large amount of coal resources, but also produce a large amount of high-temperature toxic and harmful gases such as CO, polluting the spontaneous combustion environment; when mining underground coal seams, they are also very likely to cause major accidents, seriously endangering the lives of underground personnel. At present, the main technologies used to deal with coalfield fire areas are water injection, grouting, stripping of fire sources, and surface covering, which not only consumes a lot of manpower and material resources, but also is a serious waste of coal, a non-renewable resource.

[0003] Now, all countries are also committed to studying how to extract and utilize the huge heat energy generated by coalfield fire areas. However, because coalfield fire areas are widely distributed and the geological environment is complex and changeable, they can only rely on a small amount of on-site exploration data to analyze the spontaneous combustion characteristics of coalfield fire areas in specific areas. It is impossible to accurately determine the diffusion range of coalfield fire areas and the law of fire area expansion, so that in the process of fire extinguishing, the heat energy of coalfield fire areas cannot be efficiently utilized. Summary of the invention

[0004] In order to solve the above deficiencies in the prior art, the present invention aims to provide a coalfield fire zone thermal energy conversion analysis system based on gravity heat pipe regulation, so as to accurately and comprehensively analyze and study the spontaneous combustion characteristics of coal in different fields, thereby achieving the purpose of efficient utilization of thermal energy in medium and high temperature coalfield fire zones.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a coalfield fire zone thermal energy conversion analysis system based on gravity heat pipe regulation, including a temperature rise control module for controlling the internal temperature of a coalfield fire zone simulation module, a thermal energy extraction module inserted into the coalfield fire zone simulation module, a temperature difference power generation module connected to the thermal energy extraction module, and a gas collection and analysis module for collecting and analyzing oxidizing gases in the coalfield fire zone simulation module.

[0006] As a limitation of the present invention, it also includes a temperature monitoring and acquisition module arranged in the coalfield fire zone simulation module; the temperature monitoring and acquisition module includes at least one nickel-chromium thermocouple network arranged in the coalfield fire zone simulation module and a temperature patrol meter connected to the cold end of the nickel-chromium thermocouple network, and the temperature patrol meter is connected to the computer via a network line.

[0007] As another limitation of the present invention, the temperature rise control module includes a box for storing the coalfield fire zone simulation module, a plurality of heating plates fixed on the four sides and the bottom of the box, and a temperature controller for detecting and regulating the heating temperature of each heating plate.

[0008] As a further limitation of the present invention, a filter rack is provided on the upper end surface of the heating plate at the bottom of the box; and the outer surface of each heating plate in contact with the box is covered with refractory fibers.

[0009] As a further limitation of the present invention, it also includes a box cover, which is fixedly connected to the box body by a sealing flange, a graphite gasket is provided at the position where the box cover contacts the top of the box side plate, and a filtering insulation layer is inlaid at the position where the box cover contacts the coalfield fire zone simulation module; a nickel-chromium thermocouple sleeve, a gravity heat pipe hole and an air outlet are also vertically arranged on the box cover.

[0010] As a third limitation of the present invention, the thermoelectric power generation module includes a plurality of groups of semiconductor thermoelectric power generation sheets connected in series and parallel; the semiconductor thermoelectric power generation sheets are a square structure of three concentric cylinders, including a hot end heat collecting plate, a thermoelectric power generation component and a cold end heat sink distributed from the inside to the outside.

[0011] As a further limitation of the present invention, the hot end heat collecting plate and the cold end heat sink are fixedly connected by bidirectional threaded fasteners; a plurality of fins are vertically embedded on the outer surface of the cold end heat sink; and a fan is also provided at the lower end of the semiconductor temperature difference power generation sheet to accelerate the flow of air inside the fin barrier.

[0012] As a further limitation of the present invention, the heat energy extraction module includes a gravity heat pipe, which includes a cylindrical evaporation section, an insulation section and a condensation section connected in sequence from bottom to top; wherein the cylindrical evaporation section is placed in the coalfield fire zone simulation module, and the condensation section is placed in the cavity of the hot end collector plate.

[0013] As a further limitation of the present invention, the gas collection and analysis module includes a gas source connected to the temperature rise control module through an air inlet pipeline, a liquid nitrogen cooling tank connected to the temperature rise control module through an air outlet pipeline, and a gas chromatograph connected to the liquid nitrogen cooling tank through an air outlet pipeline; the gas chromatograph is connected to the computer through a network line.

[0014] As a further limitation of the present invention, a pressure gauge, a pressure reducing valve, a flow meter and a flow stabilizing valve are sequentially arranged on the air inlet pipeline along the gas entry direction; a flow control valve is arranged on the air outlet pipeline between the liquid nitrogen cooling tank and the temperature rising control module; and a gas drying tank is arranged on the air outlet pipeline between the liquid nitrogen cooling tank and the gas chromatograph.

[0015] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0016] (1) The present invention realizes simulation of coalfield fire zones in different situations by cooperating with each other through the temperature rise control module and the coalfield fire zone simulation module, and utilizes the heat energy extraction module to extract the heat of the coalfield fire zone simulation module. In combination with the temperature difference power generation module, the heat energy is spontaneously converted into electrical energy without the need for external power. Then, the oxidizing gas generated in the coalfield fire zone simulation module is collected and analyzed through the gas collection and analysis module. The spontaneous combustion characteristics of coal in different fields can be analyzed and studied, thereby providing a theoretical basis and scientific guarantee for the management of the fire zone and realizing the efficient extraction and utilization of heat from medium and high temperature coalfield fires.

[0017] (2) The temperature rise control module in the present invention can control the heating plate to heat the temperature of the coalfield fire zone simulation module to a maximum of 720°C, thereby realizing a simulation test of the coalfield fire zone in the high temperature stage, and obtaining the effect of the gravity heat pipe on the extraction of heat energy from the coal pile in the high temperature stage; on the other hand, the heating plates in the temperature rise control module are arranged on the four sides and the bottom, and the temperature controller can be used to realize independent or overall operation of each heating plate, thereby realizing a simulation test of the coalfield fire zone with different heat source positions, and obtaining the influence of the change of the heat source position on the gravity heat pipe extracting heat energy from the coal pile.

[0018] In summary, the present invention has a compact structure, high versatility and practicality, can perform simulation tests on coalfield fire areas under different conditions, and is suitable for analyzing and studying the spontaneous combustion characteristics of coalfield fire areas in different fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0021] Figure 2 It is a cross-sectional view of a semiconductor thermoelectric power generation sheet according to an embodiment of the present invention.

[0022] In the figure: 1. Heating plate; 2. Temperature controller; 3. Filter rack; 4. Refractory fiber; 5. Box cover; 6. Graphite gasket; 7. Filter insulation layer; 8. Nickel-chromium thermocouple sleeve; 9. Semiconductor temperature difference power generation sheet; 10. Fan; 11. Gravity heat pipe; 12. Gas source; 13. Air inlet pipeline; 14. Air outlet pipeline; 15. Liquid nitrogen cooling tank; 16. Gas drying tank; 17. Gas chromatograph; 18. Nickel-chromium thermocouple network; 19. Temperature inspection instrument; 20. Coalfield fire zone simulation module; 21. Hot end collector plate; 22. Temperature difference power generation component; 23. Cold end heat sink; 24. Bidirectional threaded fasteners; 25. Ribs; 26. Voltage regulator controller 27. Battery. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention, and are not used to limit the present invention.

[0024] Embodiment A coalfield fire zone heat energy conversion analysis system based on gravity heat pipe regulation

[0025] like Figure 1 to Figure 2 As shown, this embodiment uses the phase change heat transfer principle of the gravity heat pipe 11 to extract heat, and combines with the semiconductor temperature difference power generation sheet 9 to convert the heat in the coalfield fire area simulation module 20 into electrical energy, and then uses the gas collection and analysis module to perform sample analysis on the oxidizing gas generated in the coalfield fire area simulation module 20, and uses the temperature monitoring and collection module to measure the temperature of the coalfield fire area simulation module 20, thereby realizing the research and analysis of the spontaneous combustion characteristics of the coalfield fire area, and obtaining the maximum efficiency of the coalfield fire area using temperature difference power generation.

[0026] It should be noted that the coalfield fire zone simulation module 20 mentioned in this embodiment is only a simulation structure of the actual environment of the mine, and is not a coalfield fire zone in the actual sense.

[0027] 1. Temperature control module

[0028] The temperature control module is used to control the temperature inside the coal field fire zone simulation module 20. Figure 1 As shown, the temperature control module includes a box, a plurality of heating plates 1 and a temperature controller 2 for adjusting the heating temperature of the heating plates 1. The box is used to store the coalfield fire zone simulation module 20, and its specifications can be formulated according to actual needs; the heating plate 1 is a high-power heating plate 1, a part of which is arranged on the four sides of the box for heating the coalfield fire zone simulation module 20, and a part of which is arranged at the bottom of the box for heating the incoming airflow. In this embodiment, 5 heating plates 1 are provided, and each heating plate 1 is regulated and detected in real time by the temperature controller 2. The temperature controller 2 can regulate the heating plates 1 at different positions to realize independent or overall operation of each heating plate 1.

[0029] The box body and the box cover 5 are connected by a sealing flange, and a graphite gasket 6 is provided at the position where the box cover 5 contacts the top of the box side plate to improve the air tightness of the box body as a whole. A filtering and heat-insulating layer 7 is inlaid at the position where the box cover 5 contacts the coalfield fire zone simulation module 20, which is used to filter and remove fixed impurities in the gas generated by the coalfield fire zone simulation module 20 to prevent gas path blockage and further ensure the heat insulation effect of the box body. In this embodiment, the filtering and heat-insulating layer 7 is asbestos. A nickel-chromium thermocouple sleeve 8, a gravity heat pipe hole and an air outlet are vertically arranged on the box cover 5, wherein the nickel-chromium thermocouple sleeve 8 can protect the long-term stability of the nickel-chromium thermocouple, and the gravity heat pipe hole can ensure that the gravity heat pipe 11 is inserted into the vertical borehole in the coalfield fire zone simulation module 20 without deviation, and the air outlet is connected to the gas outlet pipeline 14 in the gas collection and analysis module to realize the collection of oxidizing gas samples.

[0030] In order to ensure that the gas flows stably into the coalfield fire zone simulation module 20, a 5mm thick 350 mesh filter frame 3 is arranged on the upper end surface of the heating plate 1 at the bottom of the box to provide a buffer area for the gas. In order to prevent the heat loss of the box and ensure a constant temperature state, the outer surface of the heating plate 1 in contact with the box is covered with refractory fibers 4 to achieve adiabatic heat transfer.

[0031] 2. Thermoelectric Power Generation Module

[0032] The thermoelectric power generation module includes a plurality of sets of semiconductor thermoelectric power generation sheets 9 connected in series and parallel, which are used to convert thermal energy into electrical energy for storage. Figure 2 As shown, the semiconductor thermoelectric power generation sheet 9 is a square structure of three layers of concentric cylinders, which are the hot end heat collecting plate 21, the thermoelectric power generation component 22 and the cold end heat sink 23 from the inside to the outside. Among them, in order to make the heat conduction efficient and stable, the hot end heat collecting plate 21 and the cold end heat sink 23 are fixed by applying a certain tension through the bidirectional threaded fastener 24; in order to increase the heat dissipation surface area of ​​the cold end heat sink 23 and reduce the temperature of the cold end heat sink 23, a plurality of ribs 25 are vertically embedded on the outer surface of the cold end heat sink 23. In addition, a plurality of fans 10 are arranged at the lower end of the cold end heat sink 23 to speed up the flow of air blocked by the ribs 25. The current generated by the thermoelectric power generation module is converted and processed by the voltage regulator controller 26, and stored in the battery 27, and at the same time provides power for the rotation of the fan 10.

[0033] 3. Heat Extraction Module

[0034] The heat extraction module is used to extract the heat energy inside the coal field fire zone simulation module 20 and transfer it to the temperature difference power generation module. In this embodiment, the heat extraction module is a gravity heat pipe 11, which includes a cylindrical evaporation section, an insulation section and a condensation section arranged in sequence from bottom to top. Figure 1As shown, in order to extract the heat stored in the coalfield fire zone simulation module 20, the cylindrical evaporation section in the gravity heat pipe 11 is set in the vertical borehole in the coalfield fire zone simulation module 20, while the insulation section and the condensation section are located on the upper surface of the coalfield fire zone simulation module 20. The condensation section at the top of the gravity heat pipe 11 is placed in the cavity of the hot end heat collecting plate 21, so that the gravity heat pipe 11 can transfer the heat of the coalfield fire zone simulation module 20 to the temperature difference power generation module. In order to ensure efficient heat exchange between the gravity heat pipe 11 and the semiconductor power generation sheet, the condensation section is square in shape to maximize the heat exchange contact area.

[0035] 4. Gas Collection and Analysis Module

[0036] The gas collection and analysis module is used to collect and analyze the oxidizing gas generated in the coalfield fire zone simulation module 20. The gas collection and analysis module includes a gas source 12, an air inlet pipeline 13, an air outlet pipeline 14, a liquid nitrogen cooling tank 15 and a gas chromatograph 17 connected in series. Among them, the gas source 12 is used to provide gases with different characteristics; one end of the air inlet pipeline 13 is connected to the gas source 12, and the other end is embedded in the bottom heating plate 1 of the box body equipped with a sealing flange. On the air inlet pipeline 13, a pressure gauge, a pressure reducing valve, a flow meter and a flow stabilizing valve are arranged in sequence along the direction of gas entry to ensure the stable and uniform flow of gas in the pipeline.

[0037] The gas outlet pipeline 14 starts from the gas outlet, passes through the flow control valve, the liquid nitrogen cooling tank 15, the gas drying tank 16 and reaches the gas chromatograph 17 in sequence. The liquid nitrogen cooling tank 15 is used to cool the high-temperature gas flow to a safe temperature. In this embodiment, the liquid nitrogen cooling tank 15 adopts a double-layer structure, with a liquid level sensor inside and a pressure sensor on the upper part, and is connected to the flow control valve in the gas outlet pipeline 14 to ensure the safety of the container.

[0038] The gas chromatograph 17 is connected to the computer via a network line, and transmits information to the computer via the network line, and the computer converts and analyzes the information.

[0039] 5. Temperature monitoring and acquisition module

[0040] The temperature monitoring and acquisition module includes at least one nickel-chromium thermocouple network 18 arranged in the coalfield fire zone simulation module 20 and a temperature patrol meter 19 matched with the cold end of the nickel-chromium thermocouple network 18, so as to realize the real-time detection of the temperature in the coalfield fire zone simulation module 20. The nickel-chromium thermocouple network 18 is welded by high-temperature resistant and plastic steel wire, and is a truncated cone distribution structure, which can measure the temperature of each area of ​​the coalfield fire zone simulation module 20. Then the temperature patrol meter 19 is connected to the computer through the network line, and can transmit data to the computer, so that the information transmitted by the gas chromatograph 17 and the temperature patrol meter 19 is analyzed and processed by the computer to obtain the coal spontaneous combustion characteristics under the control of the high-temperature medium gravity heat pipe and the maximum efficiency of temperature difference power generation.

[0041] 6. Working Process

[0042] When using this embodiment, the temperature controller 2 in the temperature control module is used to set the temperature of the heating plate 1 to the set temperature; then the cylindrical evaporation section of the gravity heat pipe 11 is inserted into the vertical borehole in the coalfield fire zone simulation module 20 without deviation according to the reserved gravity heat pipe hole, and the insulation section and the condensation section are kept above the ground; the temperature difference power generation module is connected to the condensation section of the gravity heat pipe 11, and multiple groups of semiconductor temperature difference power generation sheets 9 are seamlessly connected to the gravity heat pipe 11. Then the temperature difference power generation module passes the generated current to the voltage regulator controller 26 for conversion processing, and then stores the electric energy through the battery 27, and at the same time supplies the fan 10.

[0043] In the process of high-temperature heat energy extraction and thermoelectric conversion, the gas collection and analysis module collects the oxidizing gas generated by the coal heating, cools it to a safe temperature, and then flows to the gas drying tank 16 to remove the water vapor volatilized in the air flow, and finally flows to the gas chromatograph 17 for sample analysis. Then the working end of the multiple groups of nickel-chromium thermocouple networks 18 in the temperature detection and collection module are arranged in the coalfield fire zone simulation module 20, and the cold end is matched with the temperature patrol meter 19 to measure the temperature in the coalfield fire zone simulation module 20. The data of the temperature patrol meter 19 and the information of the gas chromatograph 17 are transmitted to the computer through the network line, and the computer converts and analyzes them, and then obtains the natural characteristics of the high-temperature coal under the control of the gravity heat pipe and the maximum efficiency of temperature difference power generation.

[0044] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coalfield fire zone heat energy conversion analysis system based on gravity heat pipe regulation, characterized by: It includes a temperature control module for controlling the internal temperature of the coalfield fire zone simulation module, a heat energy extraction module inserted into the coalfield fire zone simulation module, a temperature difference power generation module connected to the heat energy extraction module, and a gas collection and analysis module for collecting and analyzing the oxidizing gas in the coalfield fire zone simulation module; It also includes a temperature monitoring and acquisition module arranged in the coalfield fire zone simulation module; the temperature monitoring and acquisition module includes at least one nickel-chromium thermocouple network arranged in the coalfield fire zone simulation module and a temperature inspection instrument matched with the cold end of the nickel-chromium thermocouple network, and the temperature inspection instrument is connected to the computer through a network line; The temperature control module includes a box for storing the coalfield fire zone simulation module, a plurality of heating plates fixed on the four sides and the bottom of the box, and a temperature controller for detecting and regulating the heating temperature of each heating plate; A filter rack is provided on the upper end surface of the heating plate at the bottom of the box; the outer surface of each heating plate in contact with the box is covered with refractory fiber; It also includes a box cover, which is fixedly connected to the box body through a sealing flange, a graphite gasket is provided at the position where the box cover contacts the top of the box side plate, and a filtering insulation layer is inlaid at the position where the box cover contacts the coal field fire zone simulation module; a nickel-chromium thermocouple sleeve, a gravity heat pipe hole and an air outlet are also vertically arranged on the box cover; The thermoelectric power generation module includes multiple groups of semiconductor thermoelectric power generation sheets connected in series and parallel; the semiconductor thermoelectric power generation sheet is a square structure of three concentric cylinders, including a hot end heat collecting plate, a thermoelectric power generation component and a cold end heat sink distributed from the inside to the outside; The hot end heat collecting plate and the cold end heat sink are fixedly connected by two-way threaded fasteners; a plurality of fins are vertically embedded on the outer surface of the cold end heat sink; a fan is also provided at the lower end of the semiconductor temperature difference power generation sheet to accelerate the air flow in the fin barrier; The heat energy extraction module includes a gravity heat pipe, which includes a cylindrical evaporation section, an insulation section and a condensation section connected in sequence from bottom to top; wherein the cylindrical evaporation section is placed in the coalfield fire zone simulation module, and the condensation section is placed in the cavity of the hot end collector plate; The gas collection and analysis module includes a gas source connected to the temperature control module through an air inlet pipeline, a liquid nitrogen cooling tank connected to the temperature control module through an air outlet pipeline, and a gas chromatograph connected to the liquid nitrogen cooling tank through an air outlet pipeline; the gas chromatograph is connected to a computer through a network line.

2. According to claim 1, a coalfield fire zone heat energy conversion analysis system based on gravity heat pipe regulation is characterized by: A pressure gauge, a pressure reducing valve, a flow meter and a flow stabilizing valve are arranged in sequence on the air inlet pipeline along the gas entry direction; a flow control valve is arranged on the air outlet pipeline between the liquid nitrogen cooling tank and the temperature rise control module, and a gas drying tank is arranged on the air outlet pipeline between the liquid nitrogen cooling tank and the gas chromatograph.

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