A mine waste heat recycling system

Abstract

This utility model relates to a mine waste heat recycling system, including a temperature regulating device and an RTO (Regenerative Thermal Oxidizer) furnace, a dust removal device, a static mixing device, and a main blower connected sequentially via pipelines. The temperature regulating device is connected to the static mixing device via pipelines and is used to regulate the temperature of the airflow within the static mixing device. The advantages of this utility model are its simple structure and reasonable design. It utilizes a technology that mixes waste heat flue gas with fresh air in a specific ratio to provide heating and insulation for coal mine shafts. This technology directly realizes the recovery and utilization of heat from the flue gas. The waste heat from the flue gas is directly mixed with fresh air to the supply air temperature, and the air is then delivered to the shaft for insulation. This results in high efficiency and low energy consumption. Simultaneously, it reduces the investment in waste heat boilers and other equipment, avoids heat exchange loss and reduced heat exchange efficiency, achieving energy and material savings, and high economic efficiency.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, specifically to a mine waste heat recycling system. Background Technology

[0002] During coal mining, coal mine gas (CH4) of varying concentrations is generated, with low-concentration coal mine gas (concentration <8%) accounting for as much as 60% of emissions. However, most of this gas is directly emitted, leading to significant energy waste and exacerbating the greenhouse effect and environmental pollution.

[0003] With increasing awareness of environmental protection and low carbon emissions in my country, the efficient, safe, and environmentally friendly utilization of low-concentration coal mine gas has become an urgent problem to be solved. Against this backdrop, regenerative thermal oxidizer (RTO) technology has emerged, providing a solution for the oxidation treatment of low-concentration gas and its integrated utilization in combined heat and power generation.

[0004] Currently, coal mine gas utilization is a major pathway for reducing methane emissions from coal mines, playing a positive role in promoting the achievement of carbon peaking and carbon neutrality goals. Low-concentration coal mine gas and ventilation gas utilization projects with methane volume concentrations below 8% involve decomposing and destroying coal mine gas, and utilizing the heat generated from the decomposition for power generation and heating. This avoids direct methane emissions, greenhouse gas emissions from other grid-connected power plants (including potential new power plants) in the project area, and greenhouse gas emissions from existing or planned heating facilities.

[0005] Currently, low-concentration gas regenerative thermal oxidation (RTO) technology on the market decomposes and destroys gas concentrations higher than 0.3%. Furthermore, waste heat recovery systems use waste heat boilers to extract heat from high-temperature flue gas for power generation and heating. This method requires additional equipment such as waste heat boilers, resulting in high investment, system complexity, and maintenance costs; moreover, it cannot recover heat from the low-temperature flue gas downstream of the RTO. In contrast, a technology that recovers high-temperature and low-temperature flue gas and mixes it with fresh air in a specific ratio to provide heating and insulation for coal mine shafts allows for direct recovery and utilization of flue gas heat, reduces investment in waste heat boilers and other equipment, and avoids heat exchange losses and reduced heat exchange efficiency. This achieves energy and material savings, resulting in high economic efficiency. Utility Model Content

[0006] This invention provides a mine waste heat recycling system, which aims to solve the problems in the prior art.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0008] A mine waste heat recycling system includes a temperature regulating device and an RTO oxidation furnace, a dust removal device, a static mixing device, and a main blower connected in sequence via pipelines. The temperature regulating device is connected to the static mixing device via pipelines and is used to regulate the temperature of the airflow in the static mixing device.

[0009] The beneficial effects of this utility model are: during operation, the flue gas discharged from the RTO oxidation furnace is sprayed with dust by the dust removal device to meet the air intake requirements, and then enters the static mixing device to mix with fresh air to a temperature of above 2°C and is then transported to the air intake shaft for heating and antifreeze in the well.

[0010] This utility model has a simple structure and reasonable design. It utilizes a technology that mixes flue gas with waste heat and fresh air in a certain proportion to provide heating and insulation for coal mine shafts. This technology can directly realize the recovery and utilization of heat from the flue gas. The waste heat from the flue gas is directly mixed with fresh air to the supply air temperature, and the hot air is delivered to the shaft for insulation. This method is highly efficient and has low energy consumption. At the same time, it can reduce the investment in waste heat boilers and other equipment, avoid heat exchange loss and reduction in heat exchange efficiency, and achieve energy saving and material saving, resulting in high economic efficiency.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, the temperature regulating device includes a fresh air supply mechanism and a controller. The fresh air supply mechanism is connected to the inlet end of the static mixing device via a pipeline. The fresh air supply mechanism, the main blower, and the dust removal device are respectively communicatively connected to the controller.

[0013] The beneficial effects of adopting the above-mentioned further scheme are that during the operation, the flue gas after dust removal enters the static mixing device and mixes with the fresh air supplied by the fresh air supply mechanism to meet the requirements for air supply to the well shaft; in addition, the operation of each device is controlled by the controller to realize the automatic operation of the entire system, which is convenient to operate.

[0014] Furthermore, the temperature regulation device also includes a heat replenishment mechanism and a temperature sensor. The temperature sensor is fixedly installed on the static mixing device, and its monitoring end extends into the static mixing device. The heat replenishment mechanism is connected to the pipeline between the static mixing device and the main blower through a heat replenishment pipeline. The heat replenishment mechanism and the temperature sensor are respectively connected to the controller.

[0015] The beneficial effect of adopting the above-mentioned further solution is that during the operation, the flue gas after dust removal enters the static mixing device and mixes with the fresh air supplied by the fresh air supply mechanism to meet the requirements for supplying air to the well shaft.

[0016] During the mixing process, a temperature sensor is used to monitor the temperature of the airflow in the static mixing device in real time and send it to the controller. The controller receives the corresponding temperature signal and performs judgment and analysis. When the airflow temperature in the static mixing device is too low to meet the wellbore supply requirements, a heating mechanism can be used to provide hot airflow to mix with the airflow discharged from the static mixing device to ensure the wellbore's heating and antifreeze requirements.

[0017] Furthermore, the fresh air supply mechanism includes a fresh air supply pipeline and a second temperature sensor. One end of the fresh air supply pipeline is connected to the static mixing device, and the other end is used to connect to the atmosphere. The second temperature sensor is fixedly installed on the fresh air supply pipeline and is communicatively connected to the controller, so that the monitoring end extends into the fresh air supply pipeline.

[0018] The beneficial effect of adopting the above-mentioned further scheme is that during the operation, the flue gas after dust removal enters the static mixing device, and then fresh air is supplied to the static mixing device through the fresh air supply pipeline, and mixed with the airflow in the static mixing device to meet the requirements of supplying air to the well shaft; at the same time, the temperature of the fresh air is monitored in real time using temperature sensor two.

[0019] Furthermore, the fresh air supply mechanism also includes a dilution blower, the outlet of which is connected to the other end of the fresh air supply pipeline, and its inlet is connected to one end of the air supply pipeline, the other end of which is used to connect to the atmosphere; an air valve is fixedly installed on the fresh air supply pipeline and / or the air supply pipeline respectively; the dilution blower and the air valve are respectively communicatively connected to the controller.

[0020] The advantage of adopting the above-mentioned further solution is that during the operation, fresh air is supplied to the static mixing device through the air supply pipeline by the dilution blower, making the supply of fresh air convenient.

[0021] Furthermore, it also includes a water removal device, which is located between the dust removal device and the static mixing device, and its two sides are respectively connected to the inlet ends of the dust removal device and the static mixing device through pipelines.

[0022] The advantages of adopting the above-mentioned further solution are that it has a simple structure, reasonable design, and uses a water removal device to remove moisture from the airflow, thus avoiding moisture affecting subsequent operations.

[0023] Furthermore, the dust removal device includes a dust removal tower and a spraying mechanism. The two sides of the dust removal tower are respectively connected to the RTO oxidation furnace and the static mixing device through pipelines. The spraying mechanism is distributed at the top of the dust removal tower, and part of it extends outside the dust removal tower to connect to a water source.

[0024] The beneficial effect of adopting the above-mentioned further solution is that during the dust removal process, after the airflow enters the dust removal tower, the spraying mechanism sends the spray water into the dust removal tower. The spray water mixes with the airflow as it flows downwards to remove dust from the airflow.

[0025] Furthermore, the spraying mechanism includes a nozzle assembly and a water pump. The nozzle assembly is fixedly installed on the top inside the dust removal tower. The water pump is distributed outside the dust removal tower, and its outlet is connected to the nozzle assembly through a spraying pipeline. The inlet of the water pump is connected to one end of a water supply pipeline, and the other end of the water supply pipeline is used to connect to a water source.

[0026] The beneficial effect of adopting the above-mentioned further solution is that during the dust removal process, after the airflow enters the dust removal tower, the water pump sends the spray water to the nozzle assembly. The spray water flows downward in the dust removal tower through the nozzle assembly. During the downward flow, the spray water mixes with the airflow to remove dust from the airflow.

[0027] Furthermore, the water supply pipeline is connected to the bottom of the dust removal tower through a circulation pipeline, and water valves are fixedly installed on the circulation pipeline and the spray pipeline respectively.

[0028] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The water pump can use the circulation pipeline to send the water at the bottom of the dust removal tower back to the spraying components, realizing the recycling of spraying water and saving water resources.

[0029] Furthermore, the top of the RTO oxidation furnace is connected to the dust removal device via a high-temperature flue gas pipeline, and the bottom of the RTO oxidation furnace is connected to the high-temperature flue gas pipeline via a low-temperature flue gas pipeline; the outlet end of the high-temperature flue gas pipeline is connected to one end of the exhaust pipeline, and the other end of the exhaust pipeline is used to connect to the atmosphere; control valve assemblies are fixedly installed on the high-temperature flue gas pipeline and / or the low-temperature flue gas pipeline and / or the exhaust pipeline respectively.

[0030] The advantages of adopting the above-mentioned further scheme are that it has a simple structure, reasonable design, and makes full use of the heat of the high-temperature flue gas and low-temperature flue gas discharged from the RTO oxidation furnace to provide heating and antifreeze for the subsequent well shaft, saving resources, reducing costs, and being energy-saving and environmentally friendly. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0032] Figure 2 This is a schematic diagram of the temperature regulating device in this utility model;

[0033] Figure 3 This is an assembly drawing of the dust removal device and the water removal device in this utility model;

[0034] Figure 4 This is a pipeline distribution diagram of the flue gas discharged from the RTO oxidation furnace in this utility model.

[0035] The attached diagram lists the components represented by each number as follows:

[0036] 1. RTO oxidation furnace; 2. Static mixing device; 3. Main blower; 4. Heating mechanism; 5. Temperature sensor one; 6. Fresh air supply pipeline; 7. Temperature sensor two; 8. Dilution blower; 9. Air supply pipeline; 10. Air valve; 11. Dehydration device; 12. Dust removal tower; 13. Nozzle assembly; 14. Water pump; 15. Water supply pipeline; 16. Water valve; 17. High-temperature flue gas pipeline; 18. Low-temperature flue gas pipeline; 19. Exhaust pipeline; 20. Shaft air supply pipeline; 21. Air supply valve; 22. Temperature sensor three; 23. Support leg; 24. Drain valve; 25. High-temperature flue gas valve; 26. Low-temperature flue gas valve; 27. Exhaust valve; 28. Heating valve. Detailed Implementation

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0038] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] Example 1

[0042] like Figures 1 to 4 As shown, this embodiment provides a mine waste heat recycling system, including a temperature regulating device and an RTO oxidation furnace 1, a dust removal device, a static mixing device 2 and a main blower 3 connected in sequence through pipelines. The temperature regulating device is connected to the static mixing device 2 through pipelines and is used to regulate the temperature of the airflow in the static mixing device 2.

[0043] During operation, the flue gas discharged from RTO oxidation furnace 1 is sprayed with dust by a dust removal device to meet the air intake requirements. Then it enters static mixing device 2 and is mixed with fresh air to a temperature of above 2°C before being transported to the air intake shaft for underground heating and frost prevention.

[0044] Preferably, in this embodiment, the outlet of the main blower 3 is connected to one end of the well shaft air supply pipeline 20, and the other end of the well shaft air supply pipeline 20 is used to connect to the well shaft; an air supply valve 21 and a temperature sensor 22 are also fixedly installed on the well shaft air supply pipeline 20.

[0045] During operation, the air supply valve 21 is used to control the flow of air; during the heating process, the heating device 6 uses temperature sensor 22 to monitor the temperature of the air in real time to ensure that the temperature of the mixed air is higher than 2°C, thereby ensuring underground heating and antifreeze.

[0046] Based on the above scheme, temperature sensor 22 can monitor the temperature of the airflow in real time during the heating process of the heating device 6, and send the corresponding temperature signal to the controller. The controller receives the corresponding temperature signal and controls the operation of the heating device 6 until the temperature of the airflow supplied to the well is greater than 2℃ and less than 13℃.

[0047] This embodiment features a simple structure and reasonable design. It utilizes a technology that mixes waste heat flue gas with fresh air in a specific ratio to provide heating and insulation for coal mine shafts. This technology can directly recover and utilize the heat from the flue gas. The waste heat from the flue gas is directly mixed with the fresh air to reach the supply air temperature, and the air is then delivered to the shaft for insulation. This method is highly efficient and has low energy consumption. At the same time, it can reduce the investment in waste heat boilers and other equipment, avoid heat exchange loss and reduced heat exchange efficiency, and achieve energy saving and material saving, resulting in high economic efficiency.

[0048] Example 2

[0049] Based on Example 1, in this example, the temperature regulating device includes a fresh air supply mechanism and a controller. The fresh air supply mechanism is connected to the inlet end of the static mixing device 2 through a pipeline. The fresh air supply mechanism, the main blower 3, and the dust removal device are respectively connected to the controller.

[0050] During operation, the flue gas after dust removal enters the static mixing device 2 and mixes with the fresh air supplied by the fresh air supply mechanism to meet the air supply requirements of the well shaft; in addition, the operation of each device is controlled by the controller to realize the automatic operation of the entire system, which is convenient to operate.

[0051] Example 3

[0052] Based on Embodiment 2, in this embodiment, the temperature regulating device further includes a heat replenishment mechanism 4 and a temperature sensor 5. The temperature sensor 5 is fixedly installed on the static mixing device 2, and its monitoring end extends into the static mixing device 2. The heat replenishment mechanism 4 is connected to the pipeline between the static mixing device 2 and the main blower 3 through a heat replenishment pipeline. The heat replenishment mechanism 4 and the temperature sensor 5 are respectively connected to the controller.

[0053] During the operation, the flue gas after dust removal enters the static mixing device 2 and mixes with the fresh air supplied by the fresh air supply mechanism to meet the requirements for supplying air to the well shaft.

[0054] During the mixing process, the temperature of the airflow in the static mixing device 2 is monitored in real time by temperature sensor 5 and sent to the controller. The controller receives the corresponding temperature signal and performs judgment and analysis. When the airflow temperature in the static mixing device 2 is too low to meet the wellbore supply requirements, the heating mechanism 4 can be used to provide hot airflow to mix with the airflow discharged from the static mixing device 2 to ensure the wellbore's heating and antifreeze requirements.

[0055] Preferably, in this embodiment, a heat replenishment valve 28 is fixedly installed on the heat replenishment pipeline. The heat replenishment valve 28 is preferably an electrically controlled valve, which is communicatively connected to the controller.

[0056] Preferably, in this embodiment, the above-mentioned heating mechanism 4 is preferably a boiler in the prior art, and the steam outlet of the boiler is connected to the pipeline between the static mixing device 2 and the main blower 3 through a pipeline.

[0057] In addition, the aforementioned supplementary heating unit 4 serves as a backup heat source for the waste heat system, and the heat source adopts a clean energy form.

[0058] Example 4

[0059] Based on any one of Embodiments 2 to 3, in this embodiment, the fresh air supply mechanism includes a fresh air supply pipeline 6 and a second temperature sensor 7. One end of the fresh air supply pipeline 6 is connected to the static mixing device 2, and the other end is used to connect to the atmosphere. The second temperature sensor 7 is fixedly installed on the fresh air supply pipeline 6 and is communicatively connected to the controller, and is used to monitor the extension of the end into the fresh air supply pipeline 6.

[0060] During the operation, the flue gas after dust removal enters the static mixing device 2, and then fresh air is supplied to the static mixing device 2 through the fresh air supply pipeline 6, and mixed with the airflow in the static mixing device 2 to meet the requirements for supplying air to the well shaft; at the same time, the temperature of the fresh air is monitored in real time by the temperature sensor 7.

[0061] The above scheme includes a temperature sensor 7, which can provide real-time information on the temperature of the fresh air and allows operators to easily and intuitively obtain the temperature of the fresh air.

[0062] Alternatively, a temperature sensor can be used to replace the aforementioned temperature sensor 27.

[0063] Example 5

[0064] Based on Embodiment 4, in this embodiment, the fresh air supply mechanism further includes a dilution blower 8. The outlet of the dilution blower 8 is connected to the other end of the fresh air supply pipeline 6, and its inlet is connected to one end of the air supply pipeline 9. The other end of the air supply pipeline 9 is used to connect to the atmosphere. An air valve 10 is fixedly installed on the fresh air supply pipeline 6 and / or the air supply pipeline 9 respectively.

[0065] During operation, fresh air is supplied to the static mixing device 2 via the air supply pipeline 9 using the dilution blower 8, making the supply of fresh air convenient.

[0066] Preferably, in this embodiment, each of the above-mentioned air valves 10 is an electrically controlled valve, which is communicatively connected to the controller.

[0067] Example 6

[0068] Based on the above embodiments, this embodiment also includes a water removal device 11, which is located between the dust removal device and the static mixing device 2, and its two sides are respectively connected to the inlet ends of the dust removal device and the static mixing device 2 through pipelines.

[0069] The solution has a simple structure and reasonable design. It uses a water removal device 11 to remove moisture from the airflow, thus preventing moisture from affecting subsequent operations.

[0070] Preferably, in this embodiment, the water removal device 11 adopts the high-efficiency automatic drying device for hydrogen production by electrolysis of water in the prior art, and its specific structure and principle will not be described in detail here.

[0071] Alternatively, the dehumidification device 11 can also be a rotary dehumidifier as used in the prior art.

[0072] Example 7

[0073] Based on the above embodiments, in this embodiment, the dust removal device includes a dust removal tower 12 and a spraying mechanism. The two sides of the dust removal tower 12 are respectively connected to the RTO oxidation furnace 1 and the static mixing device 2 through pipelines. The spraying mechanism is distributed at the top of the dust removal tower 12, and part of it extends outside the dust removal tower 12 to connect to a water source.

[0074] During the dust removal process, after the airflow enters the dust removal tower 12, the spraying mechanism sends spray water into the dust removal tower 12. The spray water mixes with the airflow as it flows downwards to remove dust from the airflow.

[0075] Preferably, in this embodiment, the bottom of the dust removal tower 12 is fixedly equipped with a plurality of support legs 23 at uniform intervals, and the arrangement of the plurality of support legs 23 can ensure the stability of the entire dust removal device.

[0076] Preferably, in this embodiment, the bottom of the dust removal tower 12 is provided with a drainage pipe, and a drainage valve 24 is fixedly installed on the drainage pipe.

[0077] In addition, the drain valve 24 is preferably an electrically controlled valve, but a manual valve can also be used.

[0078] Example 8

[0079] Based on Embodiment 7, in this embodiment, the spraying mechanism includes a nozzle assembly 13 and a water pump 14. The nozzle assembly 13 is fixedly installed on the top of the dust removal tower 12. The water pump 14 is distributed outside the dust removal tower 12, and its outlet is connected to the nozzle assembly 13 through a spraying pipeline. The inlet of the water pump 14 is connected to one end of a water supply pipeline 15, and the other end of the water supply pipeline 15 is used to connect to a water source.

[0080] During the dust removal process, after the airflow enters the dust removal tower 12, the water pump 14 sends the spray water to the nozzle assembly 13. The spray water flows downward in the dust removal tower 12 through the nozzle assembly 13. During the downward flow, the spray water mixes with the airflow to remove dust from the airflow.

[0081] Preferably, in this embodiment, the above-mentioned nozzle assembly 13 includes a spray pipe and a plurality of nozzles. The spray pipe is horizontally fixedly installed inside the dust removal tower 12 and is connected to one end of the spray pipe. The plurality of nozzles are evenly spaced on the lower side of the spray pipe and are respectively connected to the spray pipe.

[0082] In addition, the above-mentioned spray pipes can be straight pipes or coiled pipes.

[0083] Example 9

[0084] Based on Example 8, in this example, the water supply pipeline 15 is connected to the bottom of the dust removal tower 12 through a circulation pipeline, and water valves 16 are fixedly installed on the circulation pipeline and the spray pipeline respectively.

[0085] The scheme has a simple structure and reasonable design. The water pump 14 can use the circulation pipeline to send the water at the bottom of the dust removal tower 12 back to the spray assembly, realizing the recycling of spray water and saving water resources.

[0086] Example 10

[0087] Based on the above embodiments, in this embodiment, the top of the RTO oxidation furnace 1 is connected to the dust removal device through a high-temperature flue gas pipeline 17, and the bottom of the RTO oxidation furnace 1 is connected to the high-temperature flue gas pipeline 17 through a low-temperature flue gas pipeline 18; the outlet end of the high-temperature flue gas pipeline 17 is connected to one end of the exhaust pipeline 19, and the other end of the exhaust pipeline 19 is used to connect to the atmosphere; control valve groups are fixedly installed on the high-temperature flue gas pipeline 17 and / or the low-temperature flue gas pipeline 18 and / or the exhaust pipeline 19 respectively.

[0088] The scheme has a simple structure and reasonable design. It makes full use of the heat from the high-temperature and low-temperature flue gas discharged from the RTO oxidation furnace 1 to provide heating and antifreeze for the subsequent well shaft, saving resources, reducing costs, and being energy-saving and environmentally friendly.

[0089] Preferably, in this embodiment, the control valve group located on the high-temperature flue gas pipeline 17 includes three high-temperature flue gas valves 25, the control valve group located on the low-temperature flue gas pipeline 18 includes a low-temperature flue gas valve 26, and the control valve group located on the vent pipeline 19 includes a vent valve 27.

[0090] The working principle of this utility model is as follows:

[0091] The high-temperature flue gas (600℃-700℃) and low-temperature flue gas discharged from RTO oxidation furnace 1 are combined and then enter the dust removal device. After being sprayed by the dust removal device, the air meets the air intake requirements. After the dust removal, the air is dehydrated by the dewatering device and then enters the static mixing device 2 to be mixed with fresh air to a temperature above 2℃. The air is then transported to the air intake shaft for underground heating and frost prevention.

[0092] It should be noted that the discharge volume of high-temperature flue gas and low-temperature flue gas from the RTO oxidizer 1 is relatively small compared to the gas flow rate entering the shaft. Therefore, the temperature of the higher-temperature flue gas will be reduced to above 2°C and below 13°C after treatment to meet the air supply requirements of the shaft.

[0093] This utility model provides a mine waste heat recycling system. The system uses a technology that mixes high-temperature flue gas and low-temperature flue gas with fresh air in a certain proportion to heat and insulate the coal mine shaft. It can directly realize the heat recovery and utilization of flue gas, with high efficiency and low energy consumption. At the same time, it can reduce the investment in waste heat boilers and other equipment, avoid heat exchange loss and heat exchange efficiency reduction, achieve energy saving and material saving, and has high economic efficiency.

[0094] This invention utilizes gas thermal oxidation technology to oxidize low-concentration exhaust gas (below 0.3%), and employs an intelligent blending device to recover and utilize high-temperature and low-temperature flue gas waste heat. The entire system can achieve green zero-carbon, energy-saving and emission-reduction.

[0095] Currently, regenerative thermal oxidation (RTO) technology primarily treats low-concentration methane gas (MCG) with a concentration higher than 1.2%. Low-concentration Methane RTO waste heat recovery systems utilize high-temperature flue gas waste heat boilers to extract heat from the flue gas, which is then used to heat tap water and supply heat to mining areas. However, this method requires additional equipment such as high-temperature flue gas waste heat boilers, resulting in high investment, system complexity, and maintenance costs. Furthermore, this approach cannot recover heat from the low-temperature flue gas downstream of the RTO, leading to some waste heat loss. In contrast, a technology using intelligent blending devices to recover and utilize high-temperature and low-temperature flue gas mixed with fresh air in a specific ratio for heating and insulation of coal mine shafts can directly achieve heat recovery from the flue gas. This method is highly efficient, energy-saving, and reduces investment in waste heat boilers and other equipment, avoiding heat exchange losses and reduced heat exchange efficiency. It achieves energy and material savings, resulting in high economic efficiency.

[0096] When the concentration of exhaust gas in the mine is below 0.3%, regenerative oxidation can be performed. The exhaust gas passes through the regenerative oxidation device, where it is oxidized at high temperature into carbon dioxide and water. The regenerative oxidation device produces high-temperature and low-temperature flue gas. After dust removal by a wet scrubbing and filtration device, the flue gas enters a mixing device where fresh air is mixed with the flue gas to a temperature of 2°C before being sent into the shaft to insulate and prevent freezing of the intake shaft.

[0097] This utility model provides a mine waste heat recycling system, which has the following advantages:

[0098] 1. Utilize ultra-low concentration ventilation gas (below 0.3%) for heat storage oxidation to recover heat, save energy and reduce carbon emissions.

[0099] 2. The waste heat of the flue gas is directly mixed with fresh air to the supply air temperature, and the air is then delivered to the shaft for insulation.

[0100] 3. Easy to operate and automatically controlled.

[0101] It should be noted that the connection between the above-mentioned pipelines and equipment is preferably made by flange connection.

[0102] In addition, all electronic components involved in this utility model adopt existing technology, and all the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is existing technology.

[0103] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0104] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0105] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mine waste heat recycling system, characterized in that: It includes a temperature regulating device and an RTO oxidation furnace (1), a dust removal device, a static mixing device (2) and a main blower (3) connected in sequence by pipelines. The temperature regulating device is connected to the static mixing device (2) by pipelines and is used to regulate the temperature of the airflow in the static mixing device (2).

2. The mine waste heat recycling system according to claim 1, characterized in that: The temperature control device includes a fresh air supply mechanism and a controller. The fresh air supply mechanism is connected to the inlet end of the static mixing device (2) through a pipeline. The fresh air supply mechanism, the main blower (3) and the dust removal device are respectively connected to the controller.

3. The mine waste heat recycling system according to claim 2, characterized in that: The temperature regulating device also includes a heat replenishing mechanism (4) and a temperature sensor (5). The temperature sensor (5) is fixedly installed on the static mixing device (2), and its monitoring end extends into the static mixing device (2). The heat replenishing mechanism (4) is connected to the pipeline between the static mixing device (2) and the main blower (3) through a heat replenishing pipeline. The heat replenishing mechanism (4) and the temperature sensor (5) are respectively connected to the controller.

4. The mine waste heat recycling system according to claim 2, characterized in that: The fresh air supply mechanism includes a fresh air supply pipe (6) and a second temperature sensor (7). One end of the fresh air supply pipe (6) is connected to the static mixing device (2), and the other end is used to connect to the atmosphere. The second temperature sensor (7) is fixedly installed on the fresh air supply pipe (6) and is connected to the controller for monitoring the extension of the end into the fresh air supply pipe (6).

5. The mine waste heat recycling system according to claim 4, characterized in that: The fresh air supply mechanism also includes a dilution blower (8), the outlet of which is connected to the other end of the fresh air supply pipeline (6), and its inlet is connected to one end of the air supply pipeline (9), the other end of which is used to connect to the atmosphere; an air valve (10) is fixedly installed on the fresh air supply pipeline (6) and / or the air supply pipeline (9); the dilution blower (8) and the air valve (10) are respectively connected to the controller.

6. The mine waste heat recycling system according to claim 1, characterized in that: It also includes a water removal device (11), which is located between the dust removal device and the static mixing device (2), and its two sides are respectively connected to the inlet ends of the dust removal device and the static mixing device (2) through pipelines.

7. The mine waste heat recycling system according to any one of claims 1-6, characterized in that: The dust removal device includes a dust removal tower (12) and a spraying mechanism. The two sides of the dust removal tower (12) are respectively connected to the RTO oxidation furnace (1) and the static mixing device (2) through pipelines. The spraying mechanism is distributed at the top of the dust removal tower (12), and part of it extends outside the dust removal tower (12) to connect to a water source.

8. The mine waste heat recycling system according to claim 7, characterized in that: The spraying mechanism includes a nozzle assembly (13) and a water pump (14). The nozzle assembly (13) is fixedly installed on the top of the dust removal tower (12). The water pump (14) is distributed outside the dust removal tower (12), and its outlet is connected to the nozzle assembly (13) through a spraying pipeline. The inlet of the water pump (14) is connected to one end of a water supply pipeline (15), and the other end of the water supply pipeline (15) is used to connect to a water source.

9. The mine waste heat recycling system according to claim 8, characterized in that: The water supply pipeline (15) is connected to the bottom of the dust removal tower (12) through a circulation pipeline, and water valves (16) are fixedly installed on the circulation pipeline and the spray pipeline respectively.

10. The mine waste heat recycling system according to any one of claims 1-6, characterized in that: The top of the RTO oxidation furnace (1) is connected to the dust removal device through a high-temperature flue gas pipeline (17), and the bottom of the RTO oxidation furnace (1) is connected to the high-temperature flue gas pipeline (17) through a low-temperature flue gas pipeline (18); the outlet end of the high-temperature flue gas pipeline (17) is connected to one end of the exhaust pipeline (19), and the other end of the exhaust pipeline (19) is used to connect to the atmosphere; control valve groups are fixedly installed on the high-temperature flue gas pipeline (17) and / or the low-temperature flue gas pipeline (18) and / or the exhaust pipeline (19).

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