Ventilation and heat recovery device under mine

Abstract

The utility model provides a ventilation and heat recovery device under a mine, which belongs to the technical field of mine ventilation and comprises a ventilator, two air inlet pipelines, two impurity removal structures, a spraying system, a heating system and a fan. The ventilator is provided with an air mixing section, a dust removal section, a heating section and a mounting section; the air inlet pipeline is communicated with the air funnel and the air mixing section; the impurity removal structure is fixedly installed on the air inlet pipeline, the spraying system is installed at the top of the ventilation barrel and located in the dust removal section, and the heating system is installed in the ventilation barrel and located in the heating section; a heating pipe and a ventilation gap are arranged in the heating system; the draught fan is installed in the ventilation barrel and located in the installation section. According to the ventilation and heat recovery device under the mine, return air is recycled, the energy-saving and environment-friendly effects are achieved, meanwhile, the temperature in the mine is increased, blocky impurities and dust particles are removed in the ventilation process, and the impurities and the dust particles cannot enter the mine.

Description

Technical Field

[0001] This utility model belongs to the field of mine ventilation technology, and more specifically, it relates to a mine ventilation and heat recovery device. Background Technology

[0002] In northern my country, winter temperatures are low. When there is water seepage or dripping in the intake airway, freezing can occur, causing difficulties for the normal operation of transportation and hoisting machinery and threatening safe production. Furthermore, the large influx of cold air into the mine worsens weather conditions and affects workers' health. Therefore, the "Safety Regulations for Metal and Non-metal Mines" (GB16423-2006) stipulates that the air temperature in the intake airway during winter should be above 2℃; if it is below 2℃, heating facilities should be provided. Direct heating of the air entering the mine with open flames is prohibited. Considering the actual conditions of the mine, the main surface fan is used to provide preheated airflow underground. To achieve the expected preheating temperature, the existing exploration roadway is used, allowing the intake airflow to flow through the existing exploration roadway before entering the intake ramp. However, this method consumes a lot of energy, resulting in wasted heat energy in the mine; moreover, the fan operates at high frequency for extended periods, consuming a large amount of energy; and the ventilation process into the mine carries impurities and dust, which can easily affect the mine's internal structure. Utility Model Content

[0003] The purpose of this utility model is to provide a mine ventilation and heat recovery device to solve the technical problems of energy waste in the mine ventilation process in the prior art, which leads to poor energy-saving and environmental protection characteristics, and at the same time, it carries impurities, dust and other contaminants into the mine.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a mine ventilation and heat recovery device, comprising:

[0005] The ventilation duct has an internal section consisting of a mixing section, a dust removal section, a heating section, and an installation section arranged sequentially and interconnected along its length; the mixing section is used to mix fresh air and return air to form a mixed air.

[0006] There are two air inlet ducts, one end of which is fixedly connected to the ventilation duct and connected to the air mixing section; the other ends of the two air inlet ducts are used to connect fresh air and return air respectively.

[0007] Two impurity removal structures are fixedly installed at the other end of the air inlet duct to remove blocky impurities from the fresh air and return air.

[0008] A spray system is installed at the top of the ventilation duct and located in the dust removal section; the spray system sprays water from top to bottom to eliminate dust particles in the fresh air and return air;

[0009] A heating system is installed inside the ventilation duct and located in the heating section; the heating system is provided with a plurality of heating pipes and ventilation gaps between the heating pipes;

[0010] A fan is installed inside the ventilation duct and located in the installation section; the fan is used to generate negative pressure so that fresh air and return air pass through the mixing section, the dust removal section and the heating section in sequence.

[0011] In one possible implementation, a baffle plate is provided between the mixing section and the dust removal section, and an air inlet is provided on the lower side of the baffle plate; the spray system includes a reciprocating circulation path located in the mixing section and a spray head located above the reciprocating circulation path, one end of the reciprocating circulation path is connected to the air inlet, and the other end is connected to the heating section; the spray head sprays water from top to bottom and acts on the mixed air.

[0012] In one possible implementation, the reciprocating path includes multiple vertical plates, which are arranged in parallel at intervals and a first gap is provided between two adjacent vertical plates. The upper and lower ends of two adjacent vertical plates are separated from the top and bottom of the ventilation duct by a second gap. The vertical plates near the barrier plate are separated from the barrier plate by the first gap. The multiple first gaps and the multiple second gaps form the reciprocating path. The number of spray heads is multiple and they are arranged at intervals.

[0013] In one possible implementation, a drain hole is provided on the side wall of the ventilation duct, and the drain hole is connected to the reciprocating circulation passage; the drain hole is located below the air inlet; the spray system further includes a drain pipe fixedly installed on the ventilation duct, and the drain pipe is connected to the drain hole.

[0014] In one possible implementation, the impurity removal structure includes a connecting sleeve, a screen, and a sealing cap; one end of the connecting sleeve is fixedly connected to the other end of the air inlet pipe and communicates with the air inlet pipe; the lower end of the connecting sleeve has a discharge port; the screen is installed inside the connecting sleeve to form a screening space within the connecting sleeve; the discharge port corresponds to the screening space; the sealing cap is detachably connected to the connecting sleeve and is used to close or open the discharge port.

[0015] In one possible implementation, there are two screens arranged in parallel and spaced apart; the two screens form two screening spaces within the connecting sleeve, and the mesh diameter of the two screens gradually decreases along the flow direction of the return air or fresh air; there are two discharge ports and two sealing caps, which correspond one to one.

[0016] In one possible implementation, the air inlet duct is provided with a regulating valve for adjusting the air volume and located between the impurity removal structure and the ventilation duct.

[0017] In one possible implementation, the heating system includes a plurality of heating components arranged in a reciprocating, meandering manner, and a plurality of ventilation gaps are formed on the heating components for the passage of mixed air; adjacent heating components are arranged at a 90-degree angle.

[0018] In one possible implementation, the heating component is a thermistor or a heating tube; the outer surface of the ventilation duct is provided with a power terminal connected to the thermistor or a medium inlet / outlet connected to the heating tube.

[0019] In one possible implementation, the end of the ventilation duct away from the mixing section is further provided with a connecting section for connecting to a pipe extending into the mine; the connecting section is provided with a gas sensor for detecting the mixed air.

[0020] The beneficial effects of the mine ventilation and heat recovery device provided by this utility model are as follows: Compared with the prior art, in this mine ventilation and heat recovery device, fresh air and return air with a certain temperature enter the mixing section inside the ventilation duct through two separate air inlet pipes, where they mix to form a mixed air. Simultaneously, the fresh air and return air are restricted by the impurity removal structure in the air inlet pipes, effectively intercepting blocky impurities of different sizes and preventing them from entering the ventilation duct and affecting subsequent processes. Next, the mixed air enters the dust removal section, where water is sprayed downwards by the spray system to contact the dust particles and remove them. Then, the mixed air enters the heating section, where the temperature rises under the action of the heating pipes. The mixed air also experiences a temperature increase in the heating section and flows smoothly through the ventilation gaps. Finally, under the action of the fan in the installation section, it ventilates the mine. In this way, the return air with a certain temperature is recycled and reused, and the operating frequency of the fan can be adjusted according to different time periods in the mine, so as to achieve the purpose of energy saving and environmental protection. At the same time, the heating section is used to heat the mixed air before it is introduced into the mine, which can raise the temperature inside the mine. In addition, during the ventilation process, blocky impurities and dust particles are removed and will not enter the mine. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the internal structure of the mine ventilation and heat recovery device provided for an embodiment of this utility model;

[0023] Figure 2 A top view of a mine ventilation and heat recovery device provided in an embodiment of this utility model;

[0024] Figure 3 A front view of a mine ventilation and heat recovery device provided in an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the impurity removal structure provided in an embodiment of the present utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the heating assembly provided in an embodiment of the present utility model.

[0027] The following are the labeling elements in the figure:

[0028] 10. Ventilation duct; 11. Mixing section; 12. Dust removal section; 13. Heating section; 14. Installation section; 15. Baffle plate; 16. Air inlet; 17. Drain hole; 18. Connecting section; 20. Air inlet duct; 30. Impurity removal structure; 31. Connecting sleeve; 32. Screen; 33. Sealing cover; 34. Discharge port; 35. Handle; 36. Flange; 40. Spray system; 41. Circulating passage; 42. Spray head; 43. Vertical plate; 44. Drain pipe; 50. Heating system; 51. Ventilation gap; 52. Heating component; 53. Electrical terminal; 60. Fan. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0031] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] Please see Figures 1 to 5 The present invention provides a mine ventilation and heat recovery device. The mine ventilation and heat recovery device includes a ventilation duct 10, an air inlet pipe 20, a dust removal structure 30, a spray system 40, a heating system 50, and a fan 60. The ventilation duct 10 contains a mixing section 11, a dust removal section 12, a heating section 13, and an installation section 14 arranged sequentially and interconnected along its length. The mixing section 11 is used to mix fresh air and return air to form a mixed airflow. There are two air inlet pipes 20, each with one end fixedly connected to the ventilation duct 10 and connected to the mixing section 11. The other ends of the two air inlet pipes 20 are respectively used to connect to fresh air and return air. There are two dust removal structures 30, each fixedly installed... Installed at the other end of the air inlet duct 20, it is used to remove lumpy impurities from the fresh air and return air; the spray system 40 is installed at the top of the ventilation duct 10 and is located in the dust removal section 12; the spray system 40 sprays water from top to bottom to eliminate dust particles in the fresh air and return air; the heating system 50 is installed inside the ventilation duct 10 and is located in the heating section 13; the heating system 50 is provided with several heating pipes and ventilation gaps 51 between the heating pipes; the fan 60 is installed inside the ventilation duct 10 and is located in the installation section 14; the fan 60 is used to generate negative pressure so that the fresh air and return air pass through the mixing section 11, the dust removal section 12, and the heating section 13 in sequence.

[0034] The mine ventilation and heat recovery device provided by this utility model, compared with the prior art, allows fresh air and return air with a certain temperature to enter the mixing section 11 inside the ventilation duct 10 through two separate air inlet pipes 20, where they mix to form a mixed air. Simultaneously, the fresh air and return air are restricted by the impurity removal structure 30 in the air inlet pipes 20, effectively intercepting blocky impurities of different sizes and preventing them from entering the ventilation duct 10 and affecting subsequent processes. Next, the mixed air enters the dust removal section 12, where water is sprayed downwards by the spray system 40 to contact the dust particles and remove them. Then, the mixed air enters the heating section 13, where the temperature rises under the action of the heating pipes. The mixed air, with its increased temperature, flows smoothly through the ventilation gap 51 and finally, under the action of the fan 60 in the installation section 14, ventilates the mine. In this way, the return air with a certain temperature can be recycled and reused, and the operating frequency of the blower 60 can be adjusted according to different time periods in the mine, so as to achieve the purpose of energy saving and environmental protection. At the same time, the heating section 13 is used to heat the mixed air before it is introduced into the mine, which can raise the temperature in the mine. In addition, during the ventilation process, blocky impurities and dust particles are removed and will not enter the mine.

[0035] By utilizing underground ventilation and heat recovery devices, the temperature inside the mine roadways is kept stable above 2°C during winter, complying with the relevant provisions of the "Safety Regulations for Metal and Non-metal Mines" (GB16423-2006). Based on the actual conditions of the mine, existing ventilation shafts and their surface main fans (60) are used to provide preheated airflow underground. To achieve the desired preheating temperature, existing exploration roadways are used, allowing the intake airflow to pass through these roadways before entering the intake ramp. Furthermore, this device recovers and reuses the return air, which has reached a certain temperature, achieving energy conservation.

[0036] To better utilize this device and achieve energy conservation and environmental protection, fan 60 adopts a variable frequency fan, which features high safety and reliability. Furthermore, the power of fan 60 is adjusted and controlled according to the workday and working hours, making it even more environmentally friendly and energy-efficient.

[0037] The blower 60 is equipped with a synchronous motor and a direct frequency converter, employing an AC-DC-AC current-type variable frequency speed control system, which is a self-controlled variable frequency speed control system. The frequency converter adjusts its operating frequency according to the air volume demand. Specifically, during the morning shift (7:00-16:00), it operates at a higher frequency, around 40Hz; during the afternoon shift (16:00-19:00), it operates at around 35Hz; during blasting, the frequency converter operates at a higher frequency, around 40Hz; during the evening and night shifts (20:00-23:00), the frequency converter operates at around 35Hz; when there are few personnel working underground, the frequency converter operates at around 28Hz; and during holidays or temporary shutdowns, the frequency converter operates at around 20Hz. This method provides reliable technical support for the energy-saving operation of high-power equipment in the mine and offers an effective approach to energy conservation and clean production in the mine.

[0038] In addition, the main control station for the ventilation system is installed in the mine entrance duty room and the mine dispatch room. A centralized control method is used to regulate and manage the operation of the device, enabling on-demand speed adjustment of the fan 60 and reducing the number of on-duty personnel, thus improving efficiency. Multiple remote substations are installed and connected to the main station via fiber optic Ethernet communication. Each substation's equipment is under the unified control of the main station. The control functions achieved through this method include: ① fan start / stop and forward / reverse control, allowing manual or remote command control of the fan; ② remote speed control of the fan to achieve variable speed adjustment and energy saving; ③ display of various operating conditions, such as air volume, operating voltage, operating current, and fault information, and the ability to memorize at least ten faults for accident analysis; ④ control of communication between the upper and lower level computers, enabling network communication with the upper level computer to transmit fault information, fan 60 operating status, and other information, while the upper level computer can request the lower level computer to transmit required data in real time.

[0039] Please see Figure 1As a specific embodiment of the mine ventilation and heat recovery device provided by this utility model, a baffle plate 15 is provided between the mixing section 11 and the dust removal section 12, and an air inlet 16 is provided on the lower side of the baffle plate 15; the spray system 40 includes a reciprocating circulation passage 41 located in the mixing section 11 and a spray head 42 located above the reciprocating circulation passage 41. One end of the reciprocating circulation passage 41 is connected to the air inlet 16, and the other end is connected to the heating section 13; the spray head 42 sprays water from top to bottom and acts on the mixed air; the baffle plate 15 and the air inlet 16 are set so that the mixed air passes through the air inlet 16 and directly enters the reciprocating circulation passage 41, and enters from bottom to top. Under the action of the water sprayed by the spray head 42, the dust particles in the mixed air will combine with the water. Due to the action of gravity, these water droplets carrying dust will fall downward, thereby initially achieving dust removal of the mixed air. The mixed air that has undergone preliminary dust removal will continue to move forward along the reciprocating circulation passage 41 and enter the heating section 13. In heating section 13, the mixed air is heated by a heating device. A water tank or water pipe is installed on ventilation duct 10, and the water pipe is connected to the spray head 42.

[0040] Please see Figure 1 As a specific embodiment of the mine ventilation and heat recovery device provided by this utility model, the reciprocating circulation passage 41 includes multiple vertical plates 43. These vertical plates 43 are arranged in parallel at intervals, with a first gap between adjacent vertical plates 43. The upper and lower ends of adjacent vertical plates 43 are separated from the top and bottom of the ventilation duct 10 by a second gap. A first gap is provided between the vertical plate 43 near the baffle plate 15 and the baffle plate 15. These multiple first gaps and multiple second gaps form the reciprocating circulation passage 41. Multiple spray heads 42 are arranged at intervals. Multiple vertical plates 43 are arranged in an alternating pattern, with the first gap between adjacent vertical plates 43 and the second gap between the vertical plate 43 and the ventilation duct 10 forming the reciprocating circulation passage 41. This arrangement increases the travel distance of the mixed air in the reciprocating circulation passage 41. Simultaneously, the multiple spray heads 42 ensure that when the mixed air flows between any two adjacent vertical plates 43, it interacts with the water flow from the corresponding spray head 42.

[0041] Please see Figures 1 to 3As a specific embodiment of the mine ventilation and heat recovery device provided by this utility model, a drainage hole 17 is provided on the side wall of the ventilation duct 10, and the drainage hole 17 is connected to the reciprocating circulation passage 41; the drainage hole 17 is located below the air inlet 16; the spray system 40 also includes a drainage pipe 44 fixedly installed on the ventilation duct 10, and the drainage pipe 44 is connected to the drainage hole 17; when there is water in the ventilation duct 10, the water will be discharged through the drainage hole 17 and the drainage pipe 44, avoiding the water level from rising and affecting the flow of mixed air, and effectively preventing excessive water accumulation in the ventilation duct 10, which would affect the normal operation and service life of the ventilation duct 10. A water collection tank is connected to the other end of the drainage pipe 44 to collect the discharged water.

[0042] Please see Figures 1 to 4 As a specific embodiment of the mine ventilation and heat recovery device provided by this utility model, the impurity removal structure 30 includes a connecting sleeve 31, a screen 32, and a sealing cover 33. One end of the connecting sleeve 31 is fixedly connected to the other end of the air inlet pipe 20 and communicates with the air inlet pipe 20. A discharge port 34 is opened at the lower end of the connecting sleeve 31. The screen 32 is installed inside the connecting sleeve 31 to form a screening space in the connecting sleeve 31. The discharge port 34 corresponds to the screening space. The sealing cover 33 is detachably connected to the connecting sleeve 31 and is used to close or open the discharge port 34. The screen 32 is made of high-strength stainless steel, and its mesh size is designed according to the particle size of the impurities to be removed. In actual operation, when impurity-laden return air or fresh air enters the connecting sleeve 31 from the air inlet pipe 20, the airflow flows in the screening space. Due to its own weight and the action of the airflow, the impurities are blocked by the screen 32, thereby achieving the initial separation of impurities from the airflow. Clean airflow can then smoothly pass through screen 32 and continue flowing in the system. When it is necessary to clean impurities accumulated in the screening space, the operator can easily remove the sealing cover 33 from the connecting sleeve 31. At this time, the discharge port 34 is opened, and the accumulated impurities can be cleaned out through the discharge port 34. After cleaning, the sealing cover 33 is reinstalled on the connecting sleeve 31 to close the discharge port 34, and the impurity removal structure 30 can continue to work normally. This impurity removal structure 30 is not only simple in structure but also easy to operate, which can effectively improve the operating efficiency of the entire device and reduce the risk of fan 60 failure due to impurities. The connecting sleeve 31 has flanges 36 at both ends that connect to the air inlet pipe 20, and the sealing cover 33 has handles 35 for opening or closing.

[0043] Please see Figure 4As a specific embodiment of the mine ventilation and heat recovery device provided by this utility model, there are two screens 32, arranged in parallel and spaced apart. The two screens 32 form two screening spaces within the connecting sleeve 31, and the mesh diameter of the two screens 32 gradually decreases along the flow direction of the return air or fresh air. There are two discharge ports 34 and two sealing covers 33, which correspond one-to-one. Each discharge port 34 is connected to its corresponding screening space, and the sealing cover 33 can tightly cover the discharge port 34 to ensure that the material in the screening space will not leak accidentally from the discharge port 34 during the screening process. When the return air or fresh air passes through the connecting sleeve 31, the air will pass through the two screens 32 in sequence. Since the mesh diameter gradually decreases along the flow direction, larger particles of impurities will be intercepted by the first screen 32 in its corresponding screening space, while smaller particles of impurities will continue to flow with the air and be further intercepted by the second screen 32 in its own screening space. This design effectively classifies and filters return air or fresh air, improving air purity and meeting air quality requirements in different environments. When it is necessary to clean the screen 32 or remove intercepted impurities, the corresponding sealing cover 33 can be opened to remove impurities from the discharge port 34 and perform maintenance on the screen 32. The operation is convenient and efficient.

[0044] As a specific embodiment of the mine ventilation and heat recovery device provided by this utility model, the air inlet duct 20 is equipped with a regulating valve for adjusting the air volume and located between the impurity removal structure 30 and the ventilation duct 10. The regulating valve can achieve precise adjustment of the air volume by means of manual or automatic means to achieve the best ventilation effect and ensure the stable operation of the entire device. At the same time, the regulating valve is arranged between the impurity removal structure 30 and the ventilation duct 10 to avoid damage to the regulating valve by blocky impurities.

[0045] Please see Figures 1 to 3 , Figure 5 As a specific embodiment of the mine ventilation and heat recovery device provided by this utility model, the heating system 50 includes multiple heating components 52, which are arranged in a reciprocating and tortuous manner, and multiple ventilation gaps 51 are formed on the heating components 52 for the passage of mixed air; adjacent heating components 52 are arranged at a 90-degree angle; this layout allows the heating system 50 to achieve maximum heating efficiency within a limited space. The reciprocating and tortuous arrangement of multiple heating components 52 increases the airflow path within the system, allowing the air to fully contact the heating components 52. The ventilation gaps 51 on each heating component 52 ensure that the mixed air can pass through evenly, guaranteeing the uniformity of heating. The 90-degree angle arrangement of adjacent heating components 52 further optimizes the airflow direction, avoids short-circuiting of airflow, and allows the air to flow more comprehensively through each heating component 52.

[0046] Please see Figures 1 to 3 As a specific embodiment of the mine ventilation and heat recovery device provided by this utility model, the heating component 52 is a thermistor or a heating tube; the outer surface of the ventilation duct 10 is provided with a power terminal 53 connected to the thermistor or a medium inlet / outlet connected to the heating tube; when using a thermistor, the power terminal 53 can be easily connected to an external circuit, enabling the thermistor to accurately sense temperature changes and make corresponding heating responses. For the heating tube, the presence of the medium inlet / outlet ensures the normal flow of the heating medium, thereby ensuring that the heating tube can stably perform its heating function. At the same time, the ventilation duct 10 is made of a high-temperature resistant and heat-insulating material, which reduces heat waste from the heating component 52 and can withstand the high temperatures generated during operation, extending the service life of the entire device. Furthermore, a protective cover is provided on the outer surface of the ventilation duct 10, which covers and protects the power terminal 53 or the medium inlet / outlet, preventing damage or interference from external factors.

[0047] Please see Figure 1 As a specific embodiment of the mine ventilation and heat recovery device provided by this utility model, the end of the ventilation duct 10 away from the mixing section 11 is also provided with a connecting section 18. The connecting section 18 is used to connect to the pipe extending into the mine. A gas sensor for detecting the mixed air is provided on the connecting section 18. The gas sensor is connected to the monitoring system inside the mine. When an abnormality is detected in the gas composition of the mixed air, the data can be fed back to the monitoring system in a timely manner. The monitoring system will issue an alarm signal based on the received data, notifying the mine workers to take countermeasures as soon as possible. At the same time, the connecting section 18 can reliably connect to the pipe extending into the mine, ensuring smooth air supply. The connecting section 18 is made of high-strength corrosion-resistant metal to ensure stable operation for a long time in harsh mine environments and prevent leakage of mixed air due to pipe damage.

[0048] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements 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 ventilation and heat recovery device, characterized in that, include: The ventilation duct has an internal section consisting of a mixing section, a dust removal section, a heating section, and an installation section arranged sequentially and interconnected along its length; the mixing section is used to mix fresh air and return air to form a mixed air. There are two air inlet ducts, one end of which is fixedly connected to the ventilation duct and connected to the air mixing section; the other ends of the two air inlet ducts are used to connect fresh air and return air respectively. Two impurity removal structures are fixedly installed at the other end of the air inlet duct to remove blocky impurities from the fresh air and return air. A spray system is installed at the top of the ventilation duct and located in the dust removal section; The spray system sprays water from top to bottom to eliminate dust particles in the fresh air and return air. A heating system is installed inside the ventilation duct and located in the heating section; the heating system is provided with a plurality of heating pipes and ventilation gaps between the heating pipes; A fan is installed inside the ventilation duct and located in the installation section; the fan is used to generate negative pressure so that fresh air and return air pass through the mixing section, the dust removal section and the heating section in sequence.

2. The mine ventilation and heat recovery device as described in claim 1, characterized in that, A baffle plate is provided between the air mixing section and the dust removal section, and an air inlet is provided on the lower side of the baffle plate; the spray system includes a reciprocating circulation path located in the air mixing section and a spray head located above the reciprocating circulation path. One end of the reciprocating circulation path is connected to the air inlet, and the other end is connected to the heating section; the spray head sprays water from top to bottom and acts on the mixed air.

3. The mine ventilation and heat recovery device as described in claim 2, characterized in that, The reciprocating circulation path includes multiple vertical plates, which are arranged in parallel and spaced apart. A first gap is provided between two adjacent vertical plates, and a second gap is provided between the upper and lower ends of two adjacent vertical plates and the top and bottom of the ventilation duct. The vertical plates near the barrier plate are provided with the first gap between them and the barrier plate. Multiple first gaps and multiple second gaps form the reciprocating circulation path. The number of spray heads is multiple and they are arranged at intervals.

4. The mine ventilation and heat recovery device as described in claim 2, characterized in that, The ventilation duct has a drain hole on its side wall, which is connected to the reciprocating circulation passage; the drain hole is located below the air inlet; the spray system also includes a drain pipe fixedly installed on the ventilation duct, which is connected to the drain hole.

5. The mine ventilation and heat recovery device as described in claim 1, characterized in that, The impurity removal structure includes a connecting sleeve, a screen, and a sealing cap; one end of the connecting sleeve is fixedly connected to the other end of the air inlet pipe and is in communication with the air inlet pipe; the lower end of the connecting sleeve has a discharge port; the screen is installed inside the connecting sleeve to form a screening space within the connecting sleeve; the discharge port corresponds to the screening space; the sealing cap is detachably connected to the connecting sleeve and is used to close or open the discharge port.

6. The mine ventilation and heat recovery device as described in claim 5, characterized in that, The number of screens is two, and they are arranged in parallel and spaced apart; the two screens form two screening spaces inside the connecting sleeve, and the mesh diameter of the two screens gradually decreases along the flow direction of the return air or fresh air; there are two discharge ports and two sealing caps, and they correspond one to one.

7. The mine ventilation and heat recovery device as described in claim 1, characterized in that, The air inlet duct is equipped with a regulating valve for adjusting the air volume and located between the impurity removal structure and the ventilation duct.

8. The mine ventilation and heat recovery device as described in claim 1, characterized in that, The heating system includes multiple heating components arranged in a reciprocating and circumferential manner, and multiple ventilation gaps are formed on the heating components for the passage of mixed air; two adjacent heating components are arranged at a 90-degree angle.

9. The mine ventilation and heat recovery device as described in claim 8, characterized in that, The heating component is a thermistor or a heating tube; the outer side of the ventilation duct is provided with a power terminal connected to the thermistor or a medium inlet / outlet connected to the heating tube.

10. The mine ventilation and heat recovery device as described in claim 1, characterized in that, The ventilation duct is further provided with a connecting section at the end away from the mixing section, the connecting section being used to connect to a pipe extending into the mine shaft; the connecting section is provided with a gas sensor for detecting the mixed air.

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