Centralized integrated ventilation air methane efficient heat removal device

Abstract

The invention discloses a centralized integrated ventilation air methane efficient heat removal device, and belongs to the technical field of energy-saving utilization. Comprising a coal mine air return vertical shaft explosion venting door, a concrete main air duct, a ventilation air methane efficient heat removal device, a heat pump system, a concrete branch air duct, a coal mine ventilator, a fan outlet steel air duct and a ventilation diffusion tower. The efficient ventilation air methane heat removal device is mounted on a concrete main air duct between a coal mine air return vertical shaft explosion venting door and a concrete branch air duct; the efficient ventilation air methane heat removal device comprises a heat removal device connecting air duct, a heat removal device reducing air duct, a heat removal device outer shell and a heat exchanger. The heat pump system comprises a heat pump unit, and the heat pump unit is connected with the heat exchanger through a source side circulating water pump and a source side pipeline; the invention solves the problems of low heat extraction efficiency, high investment and difficulty in cleaning in the existing ventilation air methane waste heat extraction.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy-saving utilization, and specifically is a centralized integrated wind-defusing and high-efficiency heat extraction device. Background Art

[0002] At present, with the emphasis on environmental protection, coal-fired boilers in coal mines are gradually withdrawn, and the coal mine exhaust air heat pump heating technology that has emerged has been increasingly applied. Usually, a steel platform is set up at the outlet of the coal mine diffusion tower, and an exhaust air heat extraction box is installed to extract the heat in the exhaust air, transfer the heat to the circulating water, and then extract the heat through the water source heat pump to generate 40-50℃ hot water for heating or bathing. According to safety needs, two coal mine ventilators are set up, one for operation and the other for standby. The current exhaust air heat extraction requires the installation of two exhaust air heat extraction boxes, and a larger steel platform support is required, which has a high investment and is inconvenient for cleaning and maintenance; the exhaust air heat extraction box is located at the outlet of the diffusion tower, and the ground air duct is long. Most of the exhaust air heat is dissipated to the atmosphere through the air duct before extraction, and the exhaust air heat extraction efficiency is low. Summary of the invention

[0003] The present invention overcomes the deficiencies of the prior art and proposes a centralized integrated wind-lack high-efficiency heat extraction device, which solves the problems of low energy utilization, high cost and difficult maintenance of the prior wind-lack heat extraction device.

[0004] The present invention is achieved through the following technical solutions: A centralized integrated ventilation and high-efficiency heat extraction device comprises a coal mine return air shaft explosion relief door, a concrete main air duct, a ventilation and high-efficiency heat extraction device, a heat pump system, a concrete branch air duct, a coal mine ventilator, a fan outlet steel air duct and a ventilation diffusion tower; the coal mine return air shaft explosion relief door is connected to the inlet end of the concrete main air duct, the outlet end of the concrete main air duct is respectively connected to two concrete branch air ducts, the rear ends of the two concrete branch air ducts are respectively connected to a coal mine ventilator, and the coal mine ventilator is connected to the fan outlet steel air duct and the ventilation diffusion tower in sequence; the ventilation and high-efficiency heat extraction device is installed On the concrete main air duct between the explosion relief door of the coal mine return air shaft and the concrete branch air duct; the air-deficient high-efficiency heat extraction device comprises a heat extraction device connecting air duct, a heat extraction device reducing air duct, a heat extraction device outer shell and a heat exchanger; the two ends of the heat extraction device outer shell are respectively connected with the heat extraction device reducing air duct, the shrinking end of the heat extraction device reducing air duct is connected with the heat extraction device connecting air duct, the heat extraction device connecting air duct is connected with the embedded annular steel plate, and is connected to the concrete main air duct through the embedded annular steel plate; a heat exchanger is arranged inside the heat extraction device outer shell; the bottom of the heat extraction device outer shell is connected to the foundation; The heat pump system includes a heat pump unit, a source-side circulating water pump, a source-side pipeline, a user-side circulating water pump, a user-side pipeline and a terminal device; the heat pump unit is connected to the heat exchanger through the source-side circulating water pump and the source-side pipeline, and the user side of the heat pump unit is connected to the terminal device through the user-side circulating water pump and the user-side pipeline.

[0005] Furthermore, the heat exchanger is connected to the heat exchanger support frame, and a sliding guide rail is provided at the bottom of the inner body of the heat extraction device shell; the heat exchanger support frame is slidably connected to the sliding guide rail.

[0006] Furthermore, the heat exchanger is provided with several groups of coils, each group of coils is made as a whole, and the inlet and outlet of each group of coils are provided with shut-off valves; the several groups of coils are connected to the water collecting pipe, and the outlet of the water collecting pipe is provided with a metal hose; the heat pump unit is connected to the metal hose connected to the outlet of the water collecting pipe of the exhaust air high-efficiency heat extraction device through the source side circulating water pump and the source side pipeline.

[0007] Furthermore, the coil adopts an H-shaped fin tube, which is formed by symmetrically welding two steel sheets with arcs in the middle to a plain tube.

[0008] Furthermore, a sealing baffle is provided at the rear end of the outer shell of the heat extraction device.

[0009] Furthermore, the main body of the air-deficient high-efficiency heat extraction device and the concrete main air ducts before and after it, the concrete branch air ducts, and the fan outlet steel air ducts are all provided with insulation layers.

[0010] Furthermore, it also includes a PLC control system; a pressure sensor and a temperature sensor are set in the concrete main air duct before and after the wind-deficient high-efficiency heat extraction device, and the PLC control system is connected to the pressure sensor and temperature sensor set on the concrete main air duct.

[0011] Furthermore, pressure sensors and temperature sensors are provided on the primary side circulating water system and the secondary side circulating water system of the heat pump unit, and the PLC control system is connected to the pressure sensors and temperature sensors provided on the primary side circulating water system and the secondary side circulating water system of the heat pump unit.

[0012] The beneficial effects of the present invention compared with the prior art are as follows: The centralized integrated exhaust air high-efficiency heat extraction device described in the present invention solves the problems of low heat extraction efficiency, large investment and difficult cleaning in the current exhaust air waste heat extraction. The present invention combines the two exhaust air heat extraction devices installed at the outlet of the diffusion tower into a set of high-efficiency exhaust air heat extraction devices, which are installed on the exhaust air main duct close to the return air shaft. The exhaust air heat extraction temperature is high and more heat can be extracted. The equipment is reduced from two sets to one set, and the supporting steel platform is omitted, saving investment costs. The equipment is arranged on the ground, which is convenient for cleaning and maintenance.

[0013] Compared with the commonly used mine exhaust air heat extraction equipment installed at the two diffusion tower outlets of the mine, it has the following advantages: 1. The existing two sets of diffusion tower heat exchange equipment are changed into one set, saving the cost of one set of heat exchange equipment.

[0014] 2. Installing the mine air exhaust high-efficiency heat extraction device in the main air duct reduces the equipment installation height, saves the cost of the steel bracket of the heat exchange equipment, and can save about 20% of the investment cost; 3. The mine air exhaust high-efficiency heat extraction device is close to the mine return air shaft. The return air temperature is high, which avoids the heat loss from the return air shaft to the diffusion tower end, and the heat extraction is increased by about 10%.

[0015] 4. The equipment is arranged on the ground, which is convenient for later cleaning and maintenance, reducing maintenance costs.

[0016] 5. The mine air-deficient high-efficiency heat extraction device is designed with guide rails for easy maintenance and cleaning.

[0017] It can be used to replace existing natural gas boilers for heating ground buildings in coal mines and for antifreeze of shafts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A plan view of the centralized integrated wind-deficient high-efficiency heat extraction device provided by the present invention; Figure 2 This is the elevation view of the exhaust air heating device; Figure 3 This is the left side view of the exhaust air heat extraction device; Figure 4 This is a front view of the exhaust air heat extraction device; Figure 5 It is the side view of H-type fin tube; Figure 6 This is the front view of the H-type fin tube.

[0019] Numbers in the figure: 1. Explosion vent door for coal mine return shaft; 2. Concrete main air duct; 3. Pre-buried annular steel plate; 4. High-efficiency heat extraction device with lack of air; 41. Air duct for connecting the heat extraction device; 42. Variable-diameter air duct for the heat extraction device; 43. Outer shell of the heat extraction device; 44. Heat exchanger; 45. Heat exchanger support frame; 46. Shut-off valve; 47. Water collecting pipe; 48. Metal hose; 49. Sealing plug; 410. Sliding guide rail; 441. Light pipe; 442. Fin; 5. Heat pump system; 51. Heat pump unit; 52. Source side circulating water pump; 53. Source side pipeline; 54. User side circulating water pump; 55. User side pipeline; 56. Terminal equipment; 6. Concrete branch air duct; 7. Coal mine ventilator; 8. Fan outlet steel air duct; 9. Ventilation diffusion tower; 10. PLC control system. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0021] See also Figures 1 to 4 The present embodiment proposes a centralized integrated mine ventilation high-efficiency heat extraction device, including a coal mine return air shaft explosion relief door 1, a concrete main air duct 2, a pre-buried annular steel plate 3, a ventilation high-efficiency heat extraction device 4, a heat pump system 5, a concrete branch air duct 6, a coal mine ventilator 7, a fan outlet steel air duct 8, a ventilation diffusion tower 9 and a PLC control system 10.

[0022] The explosion-proof door 1 of the coal mine return air shaft is connected to the inlet end of the concrete main air duct 2, and the outlet end of the concrete main air duct 2 is respectively connected to two concrete branch air ducts 6, and the rear ends of the two concrete branch air ducts 6 are respectively connected to a coal mine ventilator 7, and the coal mine ventilator 7 is connected to the fan outlet steel air duct 8 and the ventilation diffusion tower 9 in sequence; the air exhaust high-efficiency heat extraction device 4 is installed on the concrete main air duct 2 between the explosion-proof door 1 of the coal mine return air shaft and the concrete branch air duct 6.

[0023] The exhaust air high-efficiency heat extraction device 4 is mainly composed of a heat extraction device connecting air duct 41, a heat extraction device reducing air duct 42, a heat extraction device outer shell 43, a heat exchanger 44, a heat exchanger support frame 45, a shut-off valve 46, a water collecting pipe 47, a metal hose 48, a sealing plug 49 and a sliding guide rail 410.

[0024] The two ends of the heat extraction device outer shell 43 are respectively connected to the heat extraction device reducing air duct 42, the shrinking end of the heat extraction device reducing air duct 42 is connected to the heat extraction device connecting air duct 41, the heat extraction device connecting air duct 41 is connected to the embedded annular steel plate 3, and is connected to the concrete main air duct 2 through the embedded annular steel plate 3; the bottom of the heat extraction device outer shell 43 is connected to the foundation, and the rear end of the heat extraction device outer shell 43 is provided with a sealing plugging plate 49, which prevents external air from being sucked into the exhaust air duct.

[0025] A heat exchanger 44 is arranged inside the outer shell 43 of the heat extraction device; and the heat exchanger 44 is connected to a heat exchanger support frame 45, and a sliding guide rail 410 is arranged at the bottom of the outer shell 43 of the heat extraction device; the heat exchanger support frame 45 is slidably connected to the sliding guide rail 410, and the heat exchanger support frame 45 and the heat exchanger 44 can be pushed out from the inner shell 43 of the heat extraction device through the sliding guide rail 410, and when fixed, the heat exchanger support frame 45 and the heat exchanger 44 can be fixed inside the outer shell 43 of the heat extraction device by bolts or the like; The heat exchanger 44 is provided with several groups of coils, each group of coils is made as a whole to prevent water leakage; and each group of coils is provided with a shut-off valve 46 at the inlet and outlet. If the shut-off valve 46 of a group of coils is damaged, the shut-off valve 46 of the group of coils can be closed without affecting the operation of other coils. Several groups of coils are connected to a water collecting pipe 47, and a metal hose 48 is provided at the outlet of the water collecting pipe 47 to facilitate the removal of the pipes when flushing the heat exchanger 44. A drain pipe is provided at the bottom of the exhaust air efficient heat extraction device 4 to remove condensed water in the air duct.

[0026] See also Figure 5 and Figure 6 In this embodiment, the coil adopts a super wear-resistant H-shaped fin tube, which is formed by symmetrically welding two steel sheets with arcs in the middle with the light tube 441. The two fins 442 of the H-shaped fin tube are rectangular, approximately square, and the side length is about 2 times the diameter of the light tube 441, which is an extended heating surface. The H-shaped fin tube is made of stainless steel, has a good heat exchange effect, and is easy to wash with water.

[0027] The H-type fin tube is arranged in series. The H-type fin divides the space into several small areas, which has a flow-balancing effect on the airflow. Compared with the light tube heat exchanger and spiral fin heat exchanger with staggered arrangement, the wear life is 3 to 4 times higher under the same other conditions. For the tube bundle arranged in series, since the airflow is not easy to flush the back of the tube bundle, the in-line arrangement has more dust accumulation than the staggered arrangement. Since the fins of the H-type fins are welded on both sides of the tube where dust is not easy to accumulate, and the airflow flows straightly, the airflow direction does not change, and the fins are not easy to accumulate dust. A gap of 6 to 13 mm is left in the middle of the H-type fin, which can guide the airflow to sweep the dust on the tube fins. At the appropriate wind speed, it has a good self-cleaning function. The straight channels formed on both sides of the H-type fin can reduce wind resistance, reduce the power consumption of coal mine ventilators, and save operating costs. The H-type fin adopts a unique serrated structure, and the welding fusion rate of the fins and the steel pipe can be as high as 98% or more, thereby ensuring that the H-type fin tube has a good heat transfer coefficient.

[0028] The main body of the air-deficient high-efficiency heat extraction device 4 and the concrete main air duct 2 before and after it, the concrete branch air duct 6, and the fan outlet steel air duct 8 are all provided with a thermal insulation layer to reduce heat loss.

[0029] The heat pump system 5 is composed of a heat pump unit 51 , a source-side circulating water pump 52 , a source-side pipeline 53 , a user-side circulating water pump 54 , a user-side pipeline 55 and a terminal device 56 .

[0030] The heat pump unit 51 is connected to the metal hose 48 connected to the outlet of the water collecting pipe 47 of the exhaust air high-efficiency heat extraction device 4 through the source side circulating water pump 52 and the source side pipeline 53. The user side of the heat pump unit 51 is connected to the terminal equipment 56 through the user side circulating water pump 54 and the user side pipeline 55. In winter, heat is extracted from the mine exhaust air and converted by the heat pump unit 51 to realize heating. In summer, the heat is released into the mine exhaust air to realize cooling.

[0031] The PLC control system 10 is used to receive sensor data and control the circulation pump and valves to optimize the system operation. By setting pressure sensors and temperature sensors in the concrete main air duct 2 before and after the exhaust air high-efficiency heat extraction device 4, the temperature of the exhaust air and the heat medium is detected, and the pressure difference alarm between the outlet and the inlet is calculated to remind the operator to clean the heat extraction device; pressure sensors and temperature sensors are set in the primary side circulating water system and the secondary side circulating water system of the heat pump unit 51, and timely adjustments are made according to the changes in the heat load at the user end to achieve energy saving. The system operation parameters are monitored and adjusted in real time through the control system to ensure efficient and stable operation of the system.

[0032] The centralized integrated mine air-deficient high-efficiency heat extraction device described in this embodiment has no rotating parts, and its annual continuous operation time can be greater than 8,000 hours. Under normal operating conditions, the overall service life of the device is 30 years. The device design fully considers solutions to problems such as air leakage, wear, and dust accumulation, and adopts corresponding sealing, anti-wear, anti-blocking and anti-freezing measures. The device body has good sealing performance, and the air leakage coefficient is ≤1.5%; the total sewage discharge of the device is <1.5%; the load adjustment means is simple and flexible, and the load adjustment range is 50% to 110%; a compressed air fixed rotating dust cleaning device is adopted to ensure heat exchange efficiency and reliable operation.

[0033] By real-time monitoring of key parameters, potential problems can be discovered and handled in a timely manner to ensure safe operation of the system. Monitoring and control strategies can be flexibly adjusted according to actual operating conditions and needs to improve the adaptability and flexibility of the system.

[0034] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. A centralized integrated ventilation and high-efficiency heat extraction device, comprising a coal mine return air shaft explosion relief door (1), a concrete main air duct (2), a ventilation and high-efficiency heat extraction device (4), a heat pump system (5), a concrete branch air duct (6), a coal mine ventilator (7), a fan outlet steel air duct (8) and a ventilation diffusion tower (9); the coal mine return air shaft explosion relief door (1) is connected to the inlet end of the concrete main air duct (2), the outlet end of the concrete main air duct (2) is respectively connected to two concrete branch air ducts (6), the rear ends of the two concrete branch air ducts (6) are respectively connected to a coal mine ventilator (7), and the coal mine ventilator (7) is sequentially connected to the fan outlet steel air duct (8) and the ventilation diffusion tower (9); characterized in that: The air-deficient high-efficiency heat extraction device (4) is installed on the concrete main air duct (2) between the explosion relief door (1) of the coal mine return air shaft and the concrete branch air duct (6); the air-deficient high-efficiency heat extraction device (4) comprises a heat extraction device connecting air duct (41), a heat extraction device variable-diameter air duct (42), a heat extraction device outer shell (43) and a heat exchanger (44); the two ends of the heat extraction device outer shell (43) are respectively connected to the heat extraction device variable-diameter air duct (42), the shrinking end of the heat extraction device variable-diameter air duct (42) is connected to the heat extraction device connecting air duct (41), the heat extraction device connecting air duct (41) is connected to the embedded annular steel plate (3), and is connected to the concrete main air duct (2) through the embedded annular steel plate (3); a heat exchanger (44) is arranged inside the heat extraction device outer shell (43); the bottom of the heat extraction device outer shell (43) is connected to the foundation; The heat pump system (5) comprises a heat pump unit (51), a source-side circulating water pump (52), a source-side pipeline (53), a user-side circulating water pump (54), a user-side pipeline (55), and a terminal device (56); the heat pump unit (51) is connected to the heat exchanger (44) via the source-side circulating water pump (52) and the source-side pipeline (53), and the user side of the heat pump unit (51) is connected to the terminal device (56) via the user-side circulating water pump (54) and the user-side pipeline (55).

2. A centralized integrated wind-deficient high-efficiency heat extraction device according to claim 1, characterized in that: The heat exchanger (44) is connected to a heat exchanger support frame (45), and a sliding guide rail (410) is provided at the bottom of the outer shell (43) of the heat extraction device; the heat exchanger support frame (45) is slidably connected to the sliding guide rail (410).

3. A centralized integrated wind-deficient high-efficiency heat extraction device according to claim 1 or 2, characterized in that: The heat exchanger (44) is provided with a plurality of groups of coils, each group of coils is manufactured as a whole, and each group of coils is provided with a shut-off valve (46) at its inlet and outlet; the plurality of groups of coils are connected to a water collecting pipe (47), and a metal hose (48) is provided at the outlet of the water collecting pipe (47); the heat pump unit (51) is connected to the metal hose (48) connected to the outlet of the water collecting pipe (47) of the exhaust air high-efficiency heat extraction device (4) through a source-side circulating water pump (52) and a source-side pipeline (53).

4. A centralized integrated ventilation and high-efficiency heat extraction device according to claim 3, characterized in that: The coil tube adopts an H-shaped fin tube, and the H-shaped fin tube is formed by symmetrically welding two steel sheets with a circular arc in the middle to a light tube (441).

5. A centralized integrated wind-deficient high-efficiency heat extraction device according to claim 1, characterized in that: A sealing plugging plate (49) is provided at the rear end of the outer shell (43) of the heat extraction device.

6. A centralized integrated wind-deficient high-efficiency heat extraction device according to claim 1, characterized in that: The main body of the air-deficient high-efficiency heat extraction device (4) and the concrete main air duct (2) before and after it, the concrete branch air duct (6), and the fan outlet steel air duct (8) are all provided with a thermal insulation layer.

7. The centralized integrated ventilation and high-efficiency heat extraction device according to claim 1 is characterized in that: It also includes a PLC control system (10); a pressure sensor and a temperature sensor are arranged on the concrete main air duct (2) before and after the exhaust air high-efficiency heat extraction device (4), and the PLC control system (10) is connected to the pressure sensor and the temperature sensor arranged on the concrete main air duct (2).

8. A centralized integrated wind-deficient high-efficiency heat extraction device according to claim 7, characterized in that: Pressure sensors and temperature sensors are provided on both the primary-side circulating water system and the secondary-side circulating water system of the heat pump unit (51), and the PLC control system (10) is connected to the pressure sensors and temperature sensors provided on the primary-side circulating water system and the secondary-side circulating water system of the heat pump unit (51).

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