Mine ventilation air methane recovery unit

Abstract

The utility model belongs to heat exchange technical field relates to a mine ventilation air methane heat recovery unit, including the casing and built -in plate fin heat exchanger group. Its core structure is to set up a airflow distribution device at the fresh air inlet of unit. The device can periodically alternately distribute the incoming cold fresh air to the left and right two areas of heat exchanger group. When one area carries out heat exchange, the other area suspends the fresh air, only by the warm ventilation air methane, uses the waste heat of ventilation air methane itself to complete on -line defrosting and heat regeneration. The utility model can also integrate and utilize the self -supply energy preheating module of ventilation air methane kinetic energy power generation. The unit realizes the self -defrosting function under the continuous operation through the ingenious alternate operation mode, and the structure is simple, reliable operation greatly improves the stability and energy -saving of equipment in the application of severe cold area.

Description

Technical Field

[0001] This utility model relates to a mine exhaust air heat recovery unit, belonging to the field of heat exchange technology. Background Technology

[0002] In mine ventilation systems, preheating the incoming cold fresh air with the exhausted exhaust air is an important technical means to achieve energy conservation and consumption reduction. Plate-fin heat exchangers are widely used in direct heat exchange applications due to their compact structure, large heat exchange area, and high efficiency.

[0003] However, in frigid regions during winter, this type of direct heat exchange unit faces severe challenges. When frigid fresh air at temperatures tens of degrees below zero enters the narrow fresh air duct of the unit, the surface temperature of the heat exchange fins drops rapidly to below 0°C. At this time, if the fresh air has high humidity, the water vapor in the fresh air will directly sublimate and frost on the fin surface as it flows through these supercooled fins.

[0004] The formation of frost layers poses a series of serious problems: First, frost is a poor conductor of heat, drastically reducing heat exchange efficiency; second, the frost layer thickens continuously, eventually blocking fresh air passages and causing a sharp reduction in ventilation, which not only affects heat recovery but also poses a serious threat to mine safety. Existing technologies typically require additional heating equipment for periodic defrosting, which not only increases system complexity and energy consumption but also leads to discontinuous heat recovery processes.

[0005] Therefore, developing a heat recovery unit with a simple structure that can fundamentally solve its own frost problem has important practical value. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a mine exhaust air heat recovery unit that can achieve self-defrosting and long-term stable operation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: The mine exhaust air heat recovery unit of this utility model includes a shell, and a heat exchanger group is provided inside the shell. The heat exchanger group includes multiple plate-fin heat exchange units arranged in a horizontal array. Each plate-fin heat exchange unit includes several alternately arranged plate-shaped transverse fresh air ducts and longitudinal exhaust air ducts. The media in the transverse fresh air ducts and longitudinal exhaust air ducts do not come into contact with each other. The side of the casing is provided with a fresh air inlet and a fresh air outlet, both of which are connected to the horizontal fresh air duct; the bottom and top of the casing are respectively provided with a waste air inlet and a waste air outlet, both of which are connected to the vertical waste air duct. An airflow distribution device is installed at the fresh air inlet, which can alternately distribute the incoming fresh air to the left and right parts of the heat exchanger group.

[0008] Preferably, the inlet of the heat exchanger assembly is provided with a grid-type heating wire, and the vertical wires of the grid-type heating wire correspond to the horizontal fresh air duct.

[0009] Preferably, the exhaust air outlet at the top of the housing is conical, and a wind turbine generator is installed at the outlet. The wind turbine generator is equipped with an energy storage device, which is used to supply power to the grid-type heating wire.

[0010] Since the exhaust air contains a large amount of dust, preferably, a cleaning spray pipe is provided above the heat exchanger group to periodically flush the exhaust air duct in the heat exchanger group.

[0011] Preferably, the heat exchanger group is provided in multiple groups to enhance heat exchange efficiency and thermal energy utilization. The multiple heat exchanger groups are arranged vertically, and their horizontal fresh air flows into the collecting cavity inside the shell. The collecting cavity is connected to the fresh air outlet.

[0012] Preferably, a water receiving tray is provided at the bottom of the shell.

[0013] Compared with the prior art, the beneficial effects of this utility model are reflected in: 1. Online defrosting: By alternately introducing fresh air into the left and right sections of the heat exchanger assembly, a cyclical working mode of "heat exchange" and "regeneration" is achieved. When one area is cooled by cold fresh air, the other area only receives warm exhaust air. The residual heat of the exhaust air itself melts any trace frost crystals that may form on its surface and warms it up. This design can complete defrosting without shutdown or an additional heat source, effectively preventing ice blockage.

[0014] 2. High efficiency and no defrosting energy consumption: Since the defrosting process is completed online using the waste heat of the exhaust air, it avoids the additional energy consumption caused by traditional defrosting methods (such as electric heating and hot gas bypass), ensuring the overall high efficiency and energy saving of the unit.

[0015] 3. Energy self-sufficiency and enhanced safety: Under extreme low temperatures, the unit can utilize waste wind power to generate its own electricity to drive grille-type heating wires to preheat fresh air, forming an active defense system with a closed-loop energy system. This eliminates reliance on the external power grid, improving the unit's operational reliability and safety in harsh environments.

[0016] 4. Structural Integration: The anti-frost function is cleverly integrated into the unit through structural design. Compared with the solution of using an external and complex defrosting system, this utility model has a more compact structure, simpler control, and higher reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of a single plate-fin heat exchange unit; Figure 3 This is a schematic diagram of a grid-type heating wire; Figure 4 This is a schematic diagram of a heat exchanger assembly consisting of multiple horizontally arrayed plate-fin heat exchange units. Figure 5 This is a schematic diagram showing the arrangement of the horizontal fresh air duct and the vertical exhaust air duct in a plate-fin heat exchanger unit.

[0018] In the diagram: 1. Shell; 2. Fresh air inlet; 3. Heat exchanger assembly; 4. Airflow distribution device; 5. Grille-type heating wire; 6. Exhaust air inlet; 7. Water collection tray; 8. Exhaust air outlet; 9. Wind-powered generator; 10. Energy storage device; 11. Collection chamber; 12. Fresh air outlet; 301. Plate-fin heat exchange unit; 302. Horizontal fresh air duct; 303. Vertical exhaust air duct. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments.

[0020] The description of this utility model is merely a structural or even functional description of the embodiments, and the scope of this utility model is not limited by the embodiments described herein.

[0021] like Figures 1-5 As shown, this embodiment is achieved through the following technical solution: The mine exhaust air heat recovery unit of this embodiment includes a shell 1, and a heat exchanger group 3 is provided inside the shell 1. The heat exchanger group 3 includes multiple plate-fin heat exchange units 301 arranged in a horizontal array. Each plate-fin heat exchange unit 301 includes several alternately arranged plate-shaped transverse fresh air ducts 302 and longitudinal exhaust air ducts 303. The media in the transverse fresh air ducts 302 and the longitudinal exhaust air ducts 303 do not come into contact with each other. The side of the housing 1 is provided with a fresh air inlet 2 and a fresh air outlet 12, both of which are connected to the horizontal fresh air duct 302; the lower part and the top of the housing 1 are respectively provided with a waste air inlet 6 and a waste air outlet 8, both of which are connected to the vertical waste air duct 303. Among them, the fresh air inlet 2 is equipped with an airflow distribution device 4, which can alternately distribute the incoming fresh air to the left and right parts of the heat exchanger group 3.

[0022] In this embodiment, the heat exchanger assembly 3 is provided with a grid-type heating wire 5 at the inlet, and the vertical wires of the grid-type heating wire 5 correspond to the horizontal fresh air duct 302. The exhaust air outlet at the top of the housing 1 is conical, and a wind-driven generator 9 is provided at the outlet. The wind-driven generator 9 is equipped with an energy storage device 10, which is used to supply power to the grid-type heating wire 5.

[0023] In this embodiment, there are two heat exchanger groups 3, which are arranged vertically. The fresh air from both groups is drawn into the collecting cavity 11 inside the shell 1 for temporary storage and buffering. The collecting cavity 11 is connected to the fresh air outlet 12. Each heat exchanger group 3 is equipped with a cleaning spray pipe 13 above it, and a water receiving tray 7 is provided at the bottom of the shell 1.

[0024] During operation, the warmer exhaust air enters through the exhaust air inlet 6 at the bottom of the casing 1, flows upward through the longitudinal exhaust air duct 303 inside the heat exchanger assembly 3, and is then discharged through the exhaust air outlet 8 at the top. Cold outdoor air, acting as fresh air, enters through the fresh air inlet 2 on the side of the casing 1, first passing through the airflow distribution device 4. In this embodiment, the airflow distribution device 4 can be wind-driven, operating on the same principle as the self-rotating guide vanes of a fan. Driven by the fresh air flow, it rotates and alternately distributes the incoming fresh air to the left and right parts (A, B) of the heat exchanger assembly 3. Alternatively, other electrically driven methods can be used for active air distribution, such as a rotary valve or a set of linked louvers.

[0025] When the left half is exchanging heat, its heat exchange surface temperature drops due to the cold fresh air, potentially causing slight frost buildup. Meanwhile, the right half, without any fresh air intake, receives only exhaust air at approximately 10-20°C. The residual heat of this exhaust air quickly melts the frost on its surface, raising its overall temperature and completing the "defrosting and regeneration" process. When the fresh air switches to the right half in the next cycle, it is already in a warm, frost-free optimal heat exchange state. Through this cycle, the entire heat exchanger group 3 can operate continuously and efficiently without freezing or clogging, achieving online anti-frost functionality during continuous operation.

[0026] The condensate that is released during the heat exchange and cooling process of the exhaust air will drip onto the water collection tray 7 at the bottom of the shell 1 and be discharged in a concentrated manner.

[0027] In harsh operating conditions with extremely low outdoor temperatures, the grille-type heating wire 5 can be activated to preheat the fresh air as an active anti-frost protection measure. To make this function more energy-efficient and independent, a wind turbine generator 9 and an energy storage device 10 can be installed at the exhaust air outlet 8. The wind turbine generator 9 uses the kinetic energy of the exhaust air to generate electricity, which is stored in the energy storage device 10 and used specifically to power the grille-type heating wire 5.

[0028] The fresh air heated by each heat exchanger will first be collected in the collection chamber 11 on the right side of the shell 1 for mixing, and then sent out uniformly through the fresh air outlet 12.

[0029] To facilitate the removal of dust adhering to the surface of the heat exchanger after long-term operation, a cleaning spray pipe 13 can be installed above the heat exchanger group 3 for regular spray cleaning, and the cleaning water also falls into the water receiving pan 7 for centralized discharge.

[0030] Of course, the above description is only a preferred embodiment of this utility model and should not be considered as limiting the scope of the embodiments of this utility model. This utility model is not limited to the above examples, and all equivalent changes and improvements made by those skilled in the art within the scope of this utility model should be included in the patent coverage of this utility model.

Claims

1. A mine exhaust air heat recovery unit, characterized in that, Includes a shell (1), and a heat exchanger group (3) is provided inside the shell (1). The heat exchanger group (3) includes multiple plate-fin heat exchange units (301) arranged in a horizontal array. Each plate-fin heat exchange unit (301) includes several alternately arranged plate-shaped transverse fresh air ducts (302) and longitudinal exhaust air ducts (303). The media in the transverse fresh air ducts (302) and longitudinal exhaust air ducts (303) do not come into contact with each other. The shell (1) is provided with a fresh air inlet (2) and a fresh air outlet (12) on the side. Both the fresh air inlet (2) and the fresh air outlet (12) are connected to the horizontal fresh air duct (302). The shell (1) is provided with a waste air inlet (6) and a waste air outlet (8) at the bottom and top respectively. Both the waste air inlet (6) and the waste air outlet (8) are connected to the vertical waste air duct (303). An airflow distribution device (4) is provided at the fresh air inlet (2). The airflow distribution device (4) can alternately distribute the incoming fresh air to the left and right parts of the heat exchanger group (3).

2. The mine exhaust air heat recovery unit according to claim 1, characterized in that, The heat exchanger assembly (3) is provided with a grid-type heating wire (5) at the inlet, and the vertical wire of the grid-type heating wire (5) corresponds to the horizontal fresh air duct (302).

3. The mine exhaust air heat recovery unit according to claim 2, characterized in that, The exhaust vent at the top of the housing (1) is conical, and a wind turbine generator (9) is provided at the exhaust vent. The wind turbine generator (9) is equipped with an energy storage device (10), which is used to supply power to the grid-type heating wire (5).

4. The mine exhaust air heat recovery unit according to claim 1, characterized in that, A cleaning spray pipe (13) is provided above the heat exchanger assembly (3).

5. The mine exhaust air heat recovery unit according to claim 1, characterized in that, The heat exchanger group (3) is provided in multiple groups, and the multiple heat exchanger groups (3) are arranged vertically. Their horizontal fresh air is drawn into the collection cavity (11) in the shell (1), and the collection cavity (11) is connected to the fresh air outlet (12).

6. The mine exhaust air heat recovery unit according to claim 1, characterized in that, The bottom of the shell (1) is provided with a water receiving tray (7).

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