Integrated mine local ventilation cooling device and cooling method

Abstract

The present application relates to the technical field of mining equipment, in particular to an integrated mine local ventilation cooling device and a cooling method, the device comprises a main body, along the wind direction, the main body is sequentially divided into a blowing area, a rectifying area, a dehumidifying area and a heat recovery area. The method for ventilating and cooling the mine locally by using the device comprises six steps of inhaling fresh air flow by a local fan, uniform flow in the air flow rectifying section, cooling and dehumidifying in the condensation dehumidifying section, sending the cold air flow into the tunneling working face, recovering the condensation waste heat in the sensible heat recovery section and centrally discharging the condensation water. The ventilation, rectification, cooling and dehumidifying and waste heat recovery functions are integrated in the cylindrical main body, the overall structure is compact, can be directly arranged in the original ventilation line of the tunneling roadway, does not need to additionally occupy the effective section of the roadway, directly cools and dehumidifies the air flow by using the heat exchange plate and recovers the waste heat, avoids the condensation heat directly discharged into the underground to aggravate the heat damage and reduces the overall energy consumption of the system.

Description

Technical Field

[0001] This invention relates to the field of mining equipment technology, and in particular to an integrated mining local ventilation and cooling device and cooling method. Background Technology

[0002] With the increasing depth of coal mining in my country, the high temperature and humidity in deep mines have become one of the key factors restricting safe and efficient production. As one of the harshest and most confined areas in underground operations, the tunneling face generally faces problems such as high temperature, high humidity, insufficient ventilation, and difficulty in cooling.

[0003] Currently, traditional mine local ventilation technology has the following obvious defects: 1) Conventional mine local ventilation fans only have functions such as ventilation and gas dilution, but do not have the ability to cool down and dehumidify, and cannot fundamentally improve the high temperature and high humidity working environment; 2) Independent underground cooling devices are bulky, have high explosion-proof requirements, are difficult to install, and generate a large amount of condensation heat during the cooling process, which is directly discharged underground, further worsening the thermal environment; 3) The space in the tunneling face is small, and adding additional cooling equipment will encroach on the effective cross-section of the roadway, increase ventilation resistance, and affect the stability of the ventilation system; 4) High temperature and high humidity airflow is directly sent into the working area, which can easily lead to equipment corrosion and heatstroke among personnel, seriously threatening safe production and occupational health; 5) In existing technologies, ventilation and cooling are mostly two independent systems, which have high energy consumption, complex systems, large maintenance requirements, and cannot effectively utilize waste heat.

[0004] Therefore, developing a compact, non-occupying mine cross-section, integrated ventilation-cooling-dehumidification-waste heat recovery, and explosion-proof mine local ventilation and cooling device has significant engineering application value for deep well heat hazard control. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an integrated mine-use local ventilation and cooling device, comprising a cylindrical main body. Along the airflow direction, the main body is sequentially divided into a blower zone, a rectifier zone, a dehumidifier zone, and a heat recovery zone. A local fan is located at each end of the blower zone, and a rectifier is located at each end of the rectifier zone. The rectifier has honeycomb-shaped through-holes. A heat exchange plate is located within the dehumidifier zone and is connected to circulating cold water. The inner wall of the main body in the heat recovery zone is a heat-conducting plate.

[0006] Furthermore, a horizontal flow equalization plate is installed between the two rectifiers. This flow equalization plate further eliminates residual local eddies after rectification, making the airflow field more uniform and stable, and improving the efficiency of subsequent heat exchange and dehumidification.

[0007] Furthermore, two symmetrical cold water guide plates are provided along the lower inner wall of the main body in the dehumidification zone, and a water collection tank is provided at the bottom of the dehumidification zone. The bottom edges of the two cold water guide plates are respectively connected to the water collection tank.

[0008] Furthermore, the cold water guide plate is evenly provided with guide grooves. The guide grooves can guide the condensed water to flow smoothly into the water collection tank, avoiding the accumulation of condensed water on the surface of the guide plate or its secondary entrainment into the downstream tunnel by the airflow, thus ensuring a stable dehumidification effect.

[0009] This invention also discloses a method for local ventilation and cooling in mines using the above-mentioned integrated mine local ventilation and cooling device, the operation steps of which are as follows:

[0010] 1. Local fans draw in fresh airflow

[0011] Start the two local fans in the blower area so that fresh air from outside enters the blower area along the axial direction of the cylindrical main body at a set wind speed, such as 8 to 12 m / s, to ensure that the air volume meets the ventilation requirements of the tunneling face.

[0012] 2. Flow equalization in the airflow rectification section

[0013] The airflow passes sequentially through two rectifiers at the beginning and end of the rectifier zone. The honeycomb-shaped through-holes in the rectifiers divide and guide the turbulent airflow, making the airflow velocity distribution uniform and the flow direction consistent along the axial direction. If a horizontal flow equalization plate is provided between the two rectifiers, the local eddies are further eliminated through the flow equalization plate, providing a stable flow field for subsequent dehumidification.

[0014] 3. Condensation dehumidification section: cooling and dehumidification

[0015] After homogenization, the airflow enters the dehumidification zone and comes into contact with the heat exchange plate inside. Circulating cold water is continuously introduced into the heat exchange plate. Water vapor in the airflow condenses into liquid water on the surface of the low-temperature heat exchange plate. The airflow temperature decreases and the humidity decreases. The condensate flows downward along two symmetrical cold water guide plates and the guide grooves on them, and collects in the water collection tank at the bottom of the dehumidification zone, so as to avoid the condensate being carried away by the airflow again.

[0016] 4. Cold air is delivered into the tunneling face.

[0017] After being cooled and dehumidified, the cold air continues forward along the main body and is sent to the tunneling face through the heat recovery area to reduce the temperature and humidity of the working area and improve the working environment for workers and the operating conditions for equipment.

[0018] 5. Sensible heat recovery section recovers waste heat from condensation.

[0019] When waste heat recovery is required in the heat recovery zone, the heated circulating water flowing out of the heat exchange plate enters the inner wall of the heat conduction plate in the main heat recovery zone and exchanges heat with the flowing cold air to recover some of the heat to the circulating water system, while avoiding the direct discharge of condensation heat into the underground roadway.

[0020] 6. Centralized discharge of condensate

[0021] The condensate stored in the collection tank is discharged into the underground drainage system periodically or continuously through the drainage pipe to prevent water accumulation from affecting ventilation safety or causing secondary humidity increase.

[0022] Furthermore, the speed difference between the two local fans ensures that the airflow fluctuation does not exceed ±0.5m / s. The advantages of this setting are: it can maintain a stable airflow speed, avoid excessive airflow fluctuations that would affect the rectification and flow equalization effect and the stability of subsequent condensation and dehumidification, ensure that the entire system maintains a stable cooling and dehumidification efficiency, and at the same time avoid ventilation safety hazards caused by sudden changes in airflow speed.

[0023] Compared with existing technologies, the beneficial effects of this invention are as follows: It integrates ventilation, rectification, cooling and dehumidification, and waste heat recovery functions into a cylindrical main body, resulting in a compact overall structure. It can be directly installed in the existing ventilation lines of the tunneling roadway without additionally occupying the effective cross-section of the roadway or increasing ventilation resistance. The heat exchange plates directly cool and dehumidify the airflow, and the waste heat generated by condensation can be recovered to the circulating water system through the heat recovery zone, preventing the direct discharge of condensation heat into the mine and exacerbating heat damage, while also reducing the overall energy consumption of the system. The integrated design reduces the space occupied by the equipment, simplifies the system structure, and reduces maintenance workload, effectively improving the high-temperature and high-humidity working environment of deep well tunneling faces and ensuring safe production underground. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of a rectifier;

[0026] Figure 3 This is a structural diagram of the dehumidification zone;

[0027] Figure 4 This is a schematic diagram of a cold water guide plate.

[0028] The components are labeled as follows: 1. Main body, 2. Local fan, 3. Rectifier, 4. Heat exchange plate, 5. Cold water guide plate, 6. Water collection tank, 7. Guide channel. Detailed Implementation

[0029] The present invention will be described below with reference to examples. These examples are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0030] A local ventilation and cooling scheme integrating heat and humidity separation and waste heat recovery is applicable to a 1000m deep tunneling face in a certain mine.

[0031] 1. Overall Structure

[0032] The device is 2.2m long and the outer shell is made of Q235-B explosion-proof steel with a wall thickness of 6mm. It is treated with anti-corrosion and anti-rust treatment inside and out. It is cylindrical in shape with an outer diameter of Φ800mm and is compatible with FBD series mine local ventilation fans.

[0033] 2. Main body of the partial fan

[0034] The impeller with backward-curved blades is driven by a YBF3 series explosion-proof three-phase asynchronous motor for mining, with a rated power of 2×15kW, an air volume of 300~500m³ / min, an air pressure of 800~2000Pa, a motor protection level of IP55, and an insulation class of F.

[0035] 3. Airflow rectification section

[0036] It is 200mm in length and internally incorporates a honeycomb rectifier and a perforated flow equalizer. The honeycomb rectifier is made of aluminum alloy with a regular hexagonal honeycomb structure, a side length of 5mm, and an opening rate of 88%. The flow equalizer is made of 304 stainless steel perforated plate, 2mm thick, with pores of 8-12mm in diameter, arranged radially with a sparse outer and dense inner distribution, and an opening rate of 75%. After rectification, the airflow velocity non-uniformity is reduced from 25% to below 8%.

[0037] 4. Condensation Dehumidification Section

[0038] The section is 800mm long and internally arranged with 12 sets of stainless steel microchannel heat exchange plates. Each heat exchange plate measures 600mm × 400mm × 3mm, with parallel microchannels within the plates, each measuring 1.5mm × 1.5mm. The spacing between the plates is 10mm. The refrigerant is low-temperature chilled water from the underground centralized refrigeration station, with a supply temperature of 5℃, a return temperature of 12℃, and a refrigerant flow rate of 15m³ / h. High-temperature, high-humidity airflow (temperature 32℃, relative humidity 92%) passes over the heat exchange plate surface, and after heat exchange, the airflow temperature drops to 20℃ and the relative humidity drops to 68%. A stainless steel water collection tank is installed at the bottom of the section, with a 5° incline. The outlet of the water collection tank is connected to a DN25 condensate drain pipe, and the condensate (approximately 0.8t / h) is discharged into the roadway drainage ditch.

[0039] 5. Sensible heat recovery section

[0040] It is 400mm long and has an internal plate-type waste heat recovery heat exchanger with a heat exchange area of ​​12㎡. It is made of stainless steel, and the refrigerant circuit is connected in series with the condensation dehumidification section. The recovered condensation waste heat (about 45kW) is used for mine air preheating, which can raise the air temperature from -5℃ to 3℃ in winter.

[0041] 6. Airflow guiding section

[0042] It is 300mm long and has a 5° gradually expanding structure. The end is equipped with a DN800 quick-connect flange. The flange connection is equipped with an EPDM rubber sealing ring and is directly connected to the mine ventilation duct to send the cooled and dried airflow into the tunneling face.

[0043] 7. Work Process

[0044] 1) The main body of the local fan draws in fresh air from the mine (temperature 32℃, relative humidity 92%).

[0045] 2) The airflow is homogenized and stabilized in the airflow rectification section, and the velocity field is homogenized;

[0046] 3) The airflow enters the condensation and dehumidification section, where it exchanges heat with the microchannel heat exchange plate assembly, reducing the temperature to 20℃ and the relative humidity to 68%;

[0047] 4) The condensation waste heat (approximately 45kW) is recovered in the sensible heat recovery section and used for intake air preheating;

[0048] 5) Condensate (approximately 0.8 t / h) is discharged into the roadway drainage ditch via a collection tank and diversion pipe;

[0049] 6) The cooled and dried airflow is sent into the tunneling face through the guide air supply section.

[0050] Based on the above principles and in conjunction with the accompanying drawings, the present invention provides a specific embodiment for further illustration.

[0051] like Figures 1-4 As shown, an integrated mine-use local ventilation and cooling device includes a cylindrical main body 1. Along the airflow direction, the main body 1 is divided into a blower zone, a rectifier zone, a dehumidifier zone, and a heat recovery zone. A local fan 2 is provided at each end of the blower zone. A rectifier 3 is provided at each end of the rectifier zone. The rectifier 3 has honeycomb-shaped through holes, and a horizontal flow equalization plate is provided between the two rectifiers 3. A heat exchange plate 4 is provided in the dehumidifier zone, and the heat exchange plate 4 is connected to circulating cold water. Two symmetrical cold water guide plates 5 are provided along the lower inner wall of the main body 1 in the dehumidifier zone. A water collection tank 6 is provided at the bottom of the dehumidifier zone. The bottom edges of the two cold water guide plates 5 are connected to the water collection tank 6, and guide grooves 7 are evenly provided on the cold water guide plates 5. The inner wall of the main body 1 at the heat recovery zone is a heat-conducting plate.

[0052] The operating steps of the above device are as follows:

[0053] 1. Local fans draw in fresh airflow

[0054] Start the two local fans 2 in the blower area so that the fresh airflow from outside enters the blower area along the axis of the cylindrical body 1 at a set wind speed, and ensure that the speed difference between the two local fans 2 is such that the wind speed fluctuation does not exceed ±0.5m / s.

[0055] 2. Flow equalization in the airflow rectification section

[0056] The airflow passes through two rectifiers 3 at the beginning and end of the rectifier zone in sequence. The honeycomb-shaped through holes in the rectifiers 3 divide and guide the turbulent airflow, so that the airflow velocity is evenly distributed and the flow direction is consistent along the axial direction. If a horizontal flow equalization plate is provided between the two rectifiers 3, the local eddies are further eliminated by the flow equalization plate, providing a stable flow field for subsequent dehumidification.

[0057] 3. Condensation dehumidification section: cooling and dehumidification

[0058] The homogenized airflow enters the dehumidification zone and comes into contact with the heat exchange plate 4 installed inside. Circulating cold water is continuously introduced into the heat exchange plate 4.

[0059] 4. Cold air is delivered into the tunneling face.

[0060] After being cooled and dehumidified, the cold airflow continues forward along the main body 1 and is sent to the tunneling face via the heat recovery zone;

[0061] 5. Sensible heat recovery section recovers waste heat from condensation.

[0062] When waste heat recovery is required in the heat recovery zone, the heated circulating water flowing out of the heat exchange plate 4 enters the inner wall of the heat-conducting plate in the heat recovery zone of the main body 1, and exchanges heat with the flowing cold air to recover some heat to the circulating water system, while avoiding the direct discharge of condensation heat into the underground roadway.

[0063] 6. Centralized discharge of condensate

[0064] The condensate stored in the water collection tank 6 is discharged periodically or continuously into the underground drainage system through the drainage pipe.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated local ventilation and cooling device for mines, characterized in that, The system includes a cylindrical main body (1), which is divided into a blower zone, a rectifier zone, a dehumidifier zone and a heat recovery zone along the airflow direction. A local fan (2) is provided at the beginning and end of the blower zone. A rectifier (3) is provided at the beginning and end of the rectifier zone. The rectifier (3) is provided with honeycomb-shaped through holes. A heat exchange plate (4) is provided in the dehumidifier zone. The heat exchange plate (4) is connected to circulating cold water. The inner wall of the main body (1) in the heat recovery zone is a heat-conducting plate.

2. The integrated mine local ventilation and cooling device according to claim 1, characterized in that, A horizontal flow equalization plate is provided between the two rectifiers (3).

3. The integrated mine local ventilation and cooling device according to claim 1, characterized in that, Two symmetrical cold water guide plates (5) are provided along the lower inner wall of the main body (1) in the dehumidification zone. A water collection tank (6) is provided at the bottom of the dehumidification zone. The bottom edges of the two cold water guide plates (5) are respectively connected to the water collection tank (6).

4. The integrated mine local ventilation and cooling device according to claim 3, characterized in that, The cold water guide plate (5) is uniformly provided with guide grooves (7).

5. A method for local ventilation and cooling in a mine, characterized in that, The operation steps of the integrated mine local ventilation and cooling device according to any one of claims 1 to 4 are as follows: 1) Local fans draw in fresh airflow Start the two local fans (2) in the blower area to allow fresh air from the outside to enter the blower area along the axial direction of the cylindrical body (1) at a set wind speed (e.g., 8-12 m / s) to ensure that the air volume meets the ventilation requirements of the tunneling face; 2) Flow equalization in the airflow rectification section The airflow passes through two rectifiers (3) at the beginning and end of the rectifier zone in sequence. The honeycomb-shaped through holes in the rectifier (3) divide and guide the turbulent airflow, so that the airflow velocity is evenly distributed and the flow direction is consistent along the axis. If a horizontal flow equalization plate is provided between the two rectifiers (3), the local eddies are further eliminated through the flow equalization plate, providing a stable flow field for subsequent dehumidification. 3) Condensation dehumidification section: cooling and dehumidification The homogenized airflow enters the dehumidification zone and comes into contact with the heat exchange plate (4) installed inside. Circulating cold water is continuously introduced into the heat exchange plate (4). 4) Cold airflow is delivered into the tunneling face After being cooled and dehumidified, the cold air flow continues forward along the main body (1) and is sent to the tunneling face through the heat recovery area; 5) Sensible heat recovery section recovers waste heat from condensation. When it is necessary to recover waste heat in the heat recovery zone, the heated circulating water flowing out of the heat exchange plate (4) enters the inner wall of the heat-conducting plate of the heat recovery zone of the main body (1) and exchanges heat with the flowing cold air to recover part of the heat to the circulating water system, while avoiding the direct discharge of condensation heat into the underground roadway. 6) Centralized discharge of condensate The condensate stored in the water collection tank (6) is discharged to the underground drainage system periodically or continuously through the drainage pipe.

6. The method according to claim 5, characterized in that, The speed difference between the two local fans (2) ensures that the wind speed fluctuation does not exceed ±0.5m / s.

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