Coal mine dust in-situ combustion utilization and working face refrigeration system and method

Abstract

The application discloses a coal mine dust in-situ combustion utilization and working face refrigeration system and method, a coal dust collection and classification subsystem for obtaining combustible coal dust with a predetermined particle size, a coal dust combustion and heat energy conversion subsystem for burning the combustible coal dust and preparing high-temperature hot water, an energy regulation unit for temporarily storing the high-temperature hot water and outputting high-temperature hot water with a stable temperature after regulation, a hot water absorption type refrigeration and working face cooling subsystem for cooling a coal mine working face by using the high-temperature hot water as a driving heat source, and an automatic control module for analyzing real-time temperature and coal dust concentration data of the working face to adjust the combustion power of the coal dust combustion and heat energy conversion subsystem and the refrigeration power of the hot water absorption type refrigeration and working face cooling subsystem, so that adaptive coal dust combustion and working face refrigeration are realized. The method realizes waste utilization and effectively reduces energy consumption by in-situ resource utilization of coal mine dust and cooling of the working face.

Description

Technical Field

[0001] This invention relates to the field of coal mine safety production and environmental protection technology, and in particular to a system and method for in-situ resource utilization of underground coal mine dust and simultaneous cooling of the working face. Background Technology

[0002] Coal mine safety has long faced the dual threats of coal dust pollution and high-temperature heat hazards. Coal dust, an inevitable byproduct of mining, transportation, and drilling, poses extremely serious risks. On one hand, fine coal dust, especially inhalable particulate matter, severely endangers miners' health, potentially leading to irreversible pneumoconiosis. On the other hand, coal dust is explosive; when its concentration underground reaches its explosive limit and encounters an ignition source, it can trigger a devastating chain explosion, generating high-temperature shock waves and toxic gases, causing major safety accidents. Simultaneously, with increasing mining depth, the geothermal gradient results in persistently high working face temperatures. This high-temperature environment not only reduces miners' work efficiency and comfort but also easily triggers equipment malfunctions, creating significant production hazards.

[0003] Currently, coal mines primarily address these issues through isolated and reactive methods, exhibiting significant limitations. For coal dust, the main approaches rely on spraying water and dust collectors, but these methods only achieve dust transfer or preliminary collection, failing to solve the final disposal problem. Collected coal dust is often discharged as solid waste or landfilled, resulting in high disposal costs, land occupation, and wasted chemical energy, failing to achieve resource utilization. For working face cooling, increased ventilation or electrically driven compression refrigeration solutions are commonly used. While these methods can lower the working face temperature, they consume enormous amounts of energy, imposing a heavy economic burden on coal mine operations and failing to coordinate with other energy flows within the mine.

[0004] Therefore, the research direction of this invention is to provide a new system and method that can utilize coal mine dust in situ and use the generated energy to cool the working face, thereby not only realizing waste utilization but also effectively saving energy consumption. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a coal mine dust in-situ combustion utilization and working face cooling system and method, which can effectively solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a coal mine dust in-situ combustion and utilization and working face cooling system, including a coal dust collection and classification subsystem, a coal dust combustion and thermal energy conversion subsystem, an energy regulation unit, a hot water absorption cooling and working face cooling subsystem, and an automatic control module.

[0007] The coal dust collection and classification subsystem is used to collect and screen underground coal dust to obtain combustible coal dust of a predetermined particle size.

[0008] The coal dust combustion and thermal energy conversion subsystem is used to burn combustible coal dust and transfer the generated thermal energy through a circulating working fluid to prepare high-temperature hot water.

[0009] The energy regulation unit is used to temporarily store high-temperature hot water and output high-temperature hot water at a stable temperature after regulation.

[0010] The hot water absorption refrigeration and working face cooling subsystem uses high-temperature hot water at a stable temperature as a driving heat source for refrigeration and transports the generated refrigerant to the coal mine working face for cooling.

[0011] The automatic control module is used to receive and analyze real-time temperature and coal dust concentration data of the working face in order to adjust the combustion power of the coal dust combustion and heat energy conversion subsystem and the cooling power of the hot water absorption cooling and working face cooling subsystem, so as to achieve adaptive coal dust combustion and working face cooling.

[0012] Furthermore, the coal dust collection and sorting subsystem includes: a dust removal device installed at the mining face, transport roadway, and / or drilling point for collecting suspended coal dust; a sorting device connected to the dust removal device for sorting the collected coal dust into a first-size coal dust and a second-size coal dust, wherein the second-size coal dust is larger than the first-size coal dust; the sorted first-size coal dust is directly transported to the coal dust combustion and thermal energy conversion subsystem; and a grinding device connected to the sorting device for grinding the second-size coal dust into the range of the first-size coal dust, and then returning it to the sorting device for further sorting or directly transporting it to the coal dust combustion and thermal energy conversion subsystem.

[0013] Furthermore, the particle size range of the first particle size coal dust is 20 μm to 100 μm, and the particle size of the second particle size coal dust is greater than 100 μm.

[0014] Furthermore, the coal dust combustion and thermal energy conversion subsystem includes: a fluidized bed burner, whose inlet is connected to the coal dust collection and classification subsystem for receiving and burning combustible coal dust of a preset particle size; a heat exchanger coupled to the flue gas channel of the fluidized bed burner for absorbing the heat generated by combustion; and a circulating water path flowing through the heat exchanger for generating high-temperature hot water by absorbing the heat from the heat exchanger, with a temperature not lower than 100°C.

[0015] Furthermore, the fluidized bed burner is equipped with a temperature sensor and an oxygen concentration monitor to monitor the temperature and oxygen concentration data during the combustion process, so as to ensure that the combustion process is carried out under safe and controllable conditions.

[0016] Furthermore, the energy regulation unit is a high-temperature phase change thermal storage / energy storage unit (metal hydrate). This structure allows hot water to release heat into the chiller only when the cooling load reaches the start-up threshold. The system maintains a stable heat source temperature through intelligent valve control or PID heat flow regulation, avoiding the impact of combustion fluctuations on cooling efficiency. After temperature regulation, the output hot water has a temperature fluctuation of no more than ±5℃. Maintaining a stable output temperature in this way can improve the stability of the cold flow generated by the hot water absorption refrigeration and working surface cooling subsystem.

[0017] Furthermore, the hot water absorption refrigeration and working face cooling subsystem includes: an absorption refrigeration unit, whose generator inlet is connected to the output port of the energy control unit, which uses high-temperature hot water at a stable temperature as a driving heat source to generate low-temperature refrigerant; and a working face heat exchanger installed at the coal mine working face, which is connected to the evaporator of the absorption refrigeration unit, for receiving refrigerant and exchanging heat with the working face air to achieve working face cooling.

[0018] Furthermore, the automatic control module includes a signal acquisition unit, a control processing unit, and an execution unit; the signal acquisition unit is used to acquire signals of working face temperature, coal dust concentration, and combustion temperature; the control processing unit calculates the deviation value between the cooling load and the combustion heat power based on fuzzy control or PID algorithm, and outputs adjustment commands; the execution unit regulates the coal dust supply, oxygen supply flow rate, and chiller drive heat flow according to the adjustment commands to achieve adaptive coal dust combustion and working face cooling.

[0019] The working method of the above-mentioned coal mine dust in-situ combustion and utilization and working face refrigeration system includes the following steps:

[0020] S1: Collect and classify coal dust in underground mines to obtain combustible coal dust with a preset particle size.

[0021] S2: Combustible coal dust of a preset particle size is fed into the coal dust combustion and heat energy conversion subsystem for full combustion. The heat generated by combustion is used to heat the circulating water to prepare high-temperature hot water.

[0022] S3: After the high-temperature hot water from step S2 is regulated by the energy regulation unit, the output high-temperature hot water has a temperature fluctuation of no more than ±5℃.

[0023] S4: The high-temperature hot water from step S3 is transported to the hot water absorption refrigeration and working face cooling subsystem as a driving heat source for refrigeration, and the generated refrigerant is transported to the coal mine working face for cooling.

[0024] S5: Presets multiple concentration ranges and multiple temperature ranges, monitors the temperature and coal dust concentration data of the coal mine working face in real time, and feeds the data back to the automatic control module for analysis and processing. It determines the range of the real-time temperature value and coal dust concentration, and then adjusts the combustion power of the coal dust combustion and heat energy conversion subsystem and the cooling power of the hot water absorption cooling and working face cooling subsystem according to the combustion power and cooling power of the corresponding range. This cycle continues to achieve adaptive coal dust combustion and working face cooling.

[0025] Furthermore, in step S1, for coal dust with a particle size larger than a preset particle size, it is refined by grinding to obtain combustible coal dust with a predetermined particle size. This method can make the most of the collected coal dust and maximize the resource utilization of waste.

[0026] Compared with existing technologies, this invention combines a coal dust collection and sorting subsystem, a coal dust combustion and thermal energy conversion subsystem, an energy regulation unit, a hot water absorption refrigeration and working face cooling subsystem, and an automatic control module, which has the following advantages:

[0027] 1. Resource Utilization and Collaborative Governance: This invention can collect coal dust from underground coal mines, screen it, and then burn it as an energy source to convert it into heat energy. This heat energy is then used for cooling to achieve temperature reduction of the coal mine working face. This method solves the two problems of coal mine working face dust pollution and high temperature heat hazard at the same time. Furthermore, the slag (fly ash) after coal dust combustion can be used as raw material for underground grouting stations or as sealing material for gas drilling holes in the working face, thereby maximizing the resource utilization of waste.

[0028] 2. Energy saving and consumption reduction: This invention utilizes the heat energy generated by the combustion of waste coal dust to drive refrigeration, which greatly reduces the power consumption of traditional electric refrigeration systems and lowers the operating costs of coal mines.

[0029] 3. Adaptive Control: This invention uses an automatic control module to receive and analyze real-time monitoring data on coal mine working face temperature and coal dust concentration, and then adjusts the combustion power of the coal dust combustion and heat energy conversion subsystem and the cooling power of the hot water absorption refrigeration and working face cooling subsystem to achieve adaptive coal dust combustion and working face cooling. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall process of the present invention.

[0031] Figure 2 This is a flowchart of the automatic control module in this invention. Detailed Implementation

[0032] The present invention will be further described below.

[0033] A coal mine dust in-situ combustion and utilization and working face cooling system includes a coal dust collection and classification subsystem, a coal dust combustion and thermal energy conversion subsystem, an energy regulation unit, a hot water absorption refrigeration and working face cooling subsystem, and an automatic control module;

[0034] The coal dust collection and classification subsystem is used to collect and screen coal dust in underground mines to obtain combustible coal dust of a predetermined particle size. The subsystem includes: a dust removal device installed at the mining face, transport roadway, and / or drilling point to collect suspended coal dust; a classification device (e.g., an airflow separator) connected to the dust removal device to classify the collected coal dust into a first particle size and a second particle size, with the second particle size being larger than the first particle size; the first particle size coal dust after classification is directly transported to the coal dust combustion and thermal energy conversion subsystem; and a grinding device connected to the classification device to grind the second particle size coal dust to the range of the first particle size, and then return it to the classification device for further classification or directly transport it to the coal dust combustion and thermal energy conversion subsystem; the particle size range of the first particle size coal dust is 20 μm to 100 μm, and the particle size of the second particle size coal dust is greater than 100 μm.

[0035] The coal dust combustion and thermal energy conversion subsystem is used to burn combustible coal dust and transfer the generated heat energy through a circulating working fluid to produce high-temperature hot water. This subsystem includes: a fluidized bed burner, whose inlet is connected to a coal dust collection and sorting subsystem for receiving and burning combustible coal dust of a preset particle size; combustion takes place in an oxygen-rich environment (oxygen concentration controlled at 18%-21%), with the temperature maintained at approximately 900℃; a heat exchanger coupled to the flue gas channel of the fluidized bed burner for absorbing the heat generated by combustion; and a circulating water path flowing through the heat exchanger to generate high-temperature hot water with a temperature not lower than 100℃ after absorbing heat from the heat exchanger. The fluidized bed burner is equipped with a temperature sensor and an oxygen concentration monitor to monitor the temperature and oxygen concentration data during combustion to ensure that the combustion process is carried out under safe and controllable conditions.

[0036] The energy regulation unit is a high-temperature phase change thermal storage / energy storage unit (metal hydrate), used to temporarily store high-temperature hot water and output high-temperature hot water at a stable temperature after temperature regulation. This structure ensures that the hot water releases heat into the refrigerator only when the cooling load reaches the start-up threshold. The system maintains a stable heat source temperature through intelligent valve control or PID heat flow regulation, avoiding the impact of combustion fluctuations on cooling efficiency. After temperature regulation, the output high-temperature hot water has a temperature fluctuation of no more than ±5℃. Maintaining a stable output temperature in this way can improve the stability of the cold flow generated by the hot water absorption refrigeration and working surface cooling subsystem.

[0037] The hot water absorption refrigeration and working face cooling subsystem utilizes high-temperature hot water at a stable temperature as a driving heat source for refrigeration, and transports the generated refrigerant to the coal mine working face for cooling. This subsystem includes: an absorption chiller unit, whose generator inlet is connected to the output port of the energy control unit, using high-temperature hot water at a stable temperature as a driving heat source to generate low-temperature refrigerant; and a working face heat exchanger installed at the coal mine working face, connected to the evaporator of the absorption chiller unit, used to receive the refrigerant and exchange heat with the working face air to achieve working face cooling. Furthermore, the absorption chiller unit is equipped with a sealed explosion-proof shell and a lithium bromide solution circulation anti-crystallization structure, enabling long-term stable operation in high-humidity, high-dust underground environments. The absorption chiller unit is a lithium bromide absorption chiller; the working face heat exchanger is an explosion-proof air cooler.

[0038] The automatic control module includes a signal acquisition unit, a control processing unit, and an execution unit; such as Figure 2 As shown, the signal acquisition unit is used to acquire the working face temperature, coal dust concentration and combustion temperature signals; the control processing unit calculates the deviation value between the cooling load and the combustion heat power based on fuzzy control or PID algorithm, and outputs the adjustment command; the execution unit regulates the coal dust supply, oxygen flow and chiller drive heat flow according to the adjustment command to realize adaptive coal dust combustion and working face cooling.

[0039] like Figure 1 As shown, the working method of the above-mentioned coal mine dust in-situ combustion and utilization and working face refrigeration system includes the following steps:

[0040] S1: Collect and classify coal dust from underground mines to obtain combustible coal dust of a preset particle size; for coal dust with a particle size larger than the preset size, grind it to obtain combustible coal dust of a predetermined particle size. This method can make the most of the collected coal dust and maximize the resource utilization of waste.

[0041] S2: Combustible coal dust of a preset particle size is fed into the coal dust combustion and heat energy conversion subsystem for full combustion. The heat generated by combustion is used to heat the circulating water to prepare high-temperature hot water.

[0042] S3: After the high-temperature hot water from step S2 is regulated by the energy regulation unit, the output high-temperature hot water has a temperature fluctuation of no more than ±5℃.

[0043] S4: The high-temperature hot water from step S3 is transported to the hot water absorption refrigeration and working face cooling subsystem as a driving heat source for refrigeration, and the generated refrigerant is transported to the coal mine working face for cooling.

[0044] S5: Presets multiple concentration ranges and multiple temperature ranges, monitors the temperature and coal dust concentration data of the coal mine working face in real time, and feeds the data back to the automatic control module for analysis and processing. It determines the range of the real-time temperature value and coal dust concentration, and then adjusts the combustion power of the coal dust combustion and heat energy conversion subsystem and the cooling power of the hot water absorption cooling and working face cooling subsystem according to the combustion power and cooling power of the corresponding range. This cycle continues to achieve adaptive coal dust combustion and working face cooling.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A coal mine dust in-situ combustion and utilization system and working face cooling system, characterized in that, It includes a coal dust collection and classification subsystem, a coal dust combustion and thermal energy conversion subsystem, an energy regulation unit, a hot water absorption refrigeration and working face cooling subsystem, and an automatic control module; The coal dust collection and classification subsystem is used to collect and screen underground coal dust to obtain combustible coal dust of a predetermined particle size. It includes: a dust removal device installed at the mining face, transport roadway and / or drilling point for collecting suspended coal dust; a sorting device connected to the dust removal device for sorting the collected coal dust into a first particle size and a second particle size, wherein the second particle size is larger than the first particle size; the sorted first particle size coal dust is directly transported to the coal dust combustion and thermal energy conversion subsystem; and a grinding device connected to the sorting device for grinding the second particle size coal dust into the range of the first particle size coal dust, and then returning it to the sorting device for further sorting or directly transporting it to the coal dust combustion and thermal energy conversion subsystem. The coal dust combustion and heat energy conversion subsystem is used to burn combustible coal dust and transfer the generated heat energy through a circulating working fluid to prepare high-temperature hot water. The energy regulation unit is a high-temperature phase change thermal storage / energy storage unit, which is used to temporarily store high-temperature hot water and output high-temperature hot water with a stable temperature after its regulation. After its temperature regulation, the output high-temperature hot water with a temperature fluctuation of no more than ±5℃ is also available. The hot water absorption refrigeration and working face cooling subsystem uses high-temperature hot water at a stable temperature as a driving heat source for refrigeration and transports the generated refrigerant to the coal mine working face for cooling. The automatic control module includes a signal acquisition unit, a control processing unit, and an execution unit. The signal acquisition unit is used to acquire signals of working face temperature, coal dust concentration, and combustion temperature. The control processing unit calculates the deviation between the cooling load and the combustion heat power based on fuzzy control or PID algorithm and outputs adjustment commands. The execution unit regulates the coal dust supply, oxygen supply flow, and chiller drive heat flow according to the adjustment commands to adjust the combustion power of the coal dust combustion and heat energy conversion subsystem and the cooling power of the hot water absorption refrigeration and working face cooling subsystem, thereby achieving adaptive coal dust combustion and working face cooling.

2. The coal mine dust in-situ combustion and utilization and working face cooling system according to claim 1, characterized in that, The first particle size range of coal dust is 20 μm to 100 μm, and the second particle size range of coal dust is greater than 100 μm.

3. The coal mine dust in-situ combustion and utilization and working face cooling system according to claim 1, characterized in that, The coal dust combustion and thermal energy conversion subsystem includes: a fluidized bed burner, whose inlet is connected to the coal dust collection and classification subsystem for receiving and burning combustible coal dust of a preset particle size; a heat exchanger coupled to the flue gas channel of the fluidized bed burner for absorbing the heat generated by combustion; and a circulating water path flowing through the heat exchanger for generating high-temperature hot water by absorbing the heat from the heat exchanger, with a temperature not lower than 100°C.

4. The coal mine dust in-situ combustion and utilization and working face cooling system according to claim 3, characterized in that, The fluidized bed burner is equipped with a temperature sensor and an oxygen concentration monitor to monitor the temperature and oxygen concentration data during the combustion process, so as to ensure that the combustion process is carried out under safe and controllable conditions.

5. The coal mine dust in-situ combustion and utilization and working face cooling system according to claim 1, characterized in that, The hot water absorption refrigeration and working face cooling subsystem includes: an absorption refrigeration unit, whose generator inlet is connected to the output port of the energy control unit, which uses high-temperature hot water at a stable temperature as a driving heat source to generate low-temperature refrigerant; and a working face heat exchanger installed at the coal mine working face, which is connected to the evaporator of the absorption refrigeration unit, for receiving refrigerant and exchanging heat with the working face air to achieve working face cooling.

6. A method for operating a coal mine dust in-situ combustion and utilization and working face cooling system according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1: Collect and classify coal dust in underground mines to obtain combustible coal dust with a preset particle size; S2: Combustible coal dust of a preset particle size is fed into the coal dust combustion and heat energy conversion subsystem for complete combustion. The heat generated by combustion is used to heat the circulating water to prepare high-temperature hot water. S3: After the high-temperature hot water from step S2 is temperature-regulated by the energy regulation unit, the output high-temperature hot water with a temperature fluctuation not exceeding ±5℃. S4: The high-temperature hot water from step S3 is transported to the hot water absorption refrigeration and working face cooling subsystem as a driving heat source for refrigeration, and the generated refrigerant is transported to the coal mine working face for cooling. S5: Presets multiple concentration ranges and multiple temperature ranges, monitors the temperature and coal dust concentration data of the coal mine working face in real time, and feeds the data back to the automatic control module for analysis and processing. It determines the range of the real-time temperature value and coal dust concentration, and then adjusts the combustion power of the coal dust combustion and heat energy conversion subsystem and the cooling power of the hot water absorption cooling and working face cooling subsystem according to the combustion power and cooling power of the corresponding range. This cycle continues to achieve adaptive coal dust combustion and working face cooling.

7. The working method according to claim 6, characterized in that, In step S1, for coal dust with a particle size larger than the preset particle size, it is refined by grinding to obtain combustible coal dust with a predetermined particle size.

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