Defrosting medium heating device

Abstract

The utility model relates to a defrosting medium heating device which is used for defrosting a return air heat exchanger in a dividing wall type heat extraction heat pump system, the return air heat exchanger comprises a defrosting medium flow path, a defrosting medium circulating in the defrosting medium flow path is used for defrosting, and the defrosting medium with the temperature reduced after defrosting is heated by the defrosting medium heating device. The defrosting medium heating equipment is provided with the heat exchanger used for conducting heat exchange on the defrosting medium and the heating medium; a heater for heating the heating medium; and a heating controller which controls the defrosting medium heating equipment, and the heat exchanger and the heater are arranged on the defrosting medium heating equipment side by side.

Description

Technical Field

[0001] The utility model relates to a defrosting medium heating device, which is used to heat the defrosting medium flowing through a mine return air heat exchanger in a partition heat extraction heat pump system. Background Art

[0002] In recent years, with the continuous promotion of the national energy conservation and emission reduction policies and the increasingly strict environmental protection requirements for coal mines, the recovery and utilization of low-temperature waste heat resources in coal mines to achieve clean heating in mining areas have attracted wide attention from coal enterprises. In particular, the utilization of waste heat from mine return air (exhaust air) has a large volume of return air, stable air temperature, high relative humidity, and high enthalpy value, containing a large amount of high-quality low-temperature heat energy, which is a waste heat resource with extremely high utilization value.

[0003] In the mine return air waste heat utilization technology, there are a spray-type return air heat extraction system, a direct evaporation-type return air heat extraction system, a heat pipe air-air direct heat exchange heat extraction system, and a partition heat extraction heat pump system, etc. Among them, the partition heat extraction heat pump system can achieve large-temperature-difference heat extraction from mine return air, that is, large-enthalpy-difference heat extraction. Extracting heat from the return air for building heating, shaft anti-freezing, and bathing heat in the mining area can replace the coal-fired boiler heating system, solve the practical problems of coal pollution and high operating costs in the coal enterprise heating system, and has good economic and social benefits. In recent years, it has been widely used in coal enterprises.

[0004] The existing partition heat extraction heat pump system mainly consists of a heat extraction device, a heat pump unit, a distribution pipeline, and terminal equipment, etc. The main mine ventilation fan pumps the return air from the underground to the ground. A return air heat extraction chamber is set above the mine return air vertical shaft. The heat extraction device is set in the side wall of the heat extraction chamber facade, causing the return air to flow through the fin gap in the heat extraction device forcibly, and transferring the heat of the return air to the heat extraction medium in the heat extraction device. After the heat extraction medium absorbs heat, it transports the heat energy to the evaporator end of the heat pump unit through a circulation pump. Using the heat pump principle, through a small amount of high-level electric energy input, the low-level heat energy is transferred to high-level heat energy to produce high-temperature hot water for the terminal user side. Summary of the Utility Model

[0005] Problems to be Solved by the Utility Model

[0006] In the partition heat extraction heat pump system, there is a partition-type mine return air heat exchanger (hereinafter, simply referred to as "return air heat exchanger"), which is a heat exchange device that enables heat to be transferred between the mine return air and the heat extraction medium when the mine return air and the heat extraction medium flow through both sides of the heat exchanger respectively.

[0007] When using a partition heat extraction heat pump system to extract heat from the waste heat of mine return air, the temperature of the mine return air before heat extraction is high and the humidity is high. After heat extraction, the temperature is generally below 0°C, and in severe cold and cold regions, it can usually reach -10°C or even lower, resulting in frosting on the return air heat exchanger. If defrosting is not carried out, a thick ice layer will form on the surface of the return air heat exchanger. As a result, not only does it affect the appearance, but it also reduces the heat exchange capacity of the return air heat exchanger. At the same time, it will also increase the air resistance of the mine return air heat exchanger. If it affects the mine ventilation, it will have an impact on coal mine safety. In order to prevent frosting on the return air heat exchanger, the usual design is to make the defrosting medium flow through the return air heat exchanger. The temperature of the defrosting medium flowing through the return air heat exchanger decreases. In order to be able to continue using the defrosting medium to defrost the return air heat exchanger, it is necessary to heat the defrosting medium to increase its temperature.

[0008] Existing defrosting medium heating devices are usually arranged in a straight line, occupying a large space, having a large heat loss and being troublesome to maintain.

[0009] The present utility model is completed in view of the above actual situation. The main purpose is to provide a defrosting medium heating device for heating the defrosting medium flowing through the mine return air heat exchanger in a partition heat extraction heat pump system, so as to defrost the return air heat exchanger more efficiently. On the other hand, optimize the space occupied by the overall defrosting medium heating device, reduce heat loss and facilitate maintenance.

[0010] Solution for solving the problem

[0011] A defrosting medium heating device for defrosting a return air heat exchanger in a partition heat extraction heat pump system. The return air heat exchanger includes a defrosting medium flow path. The defrosting medium flowing in the defrosting medium flow path is used for defrosting. The defrosting medium with a reduced temperature after defrosting is heated by the defrosting medium heating device and then flows back to the return air heat exchanger. The defrosting medium heating device is characterized by comprising: a heat exchanger for exchanging heat between the defrosting medium and a heating medium; a heater for heating the heating medium; and a heating controller for controlling the defrosting medium heating device. The heat exchanger and the heater are arranged side by side in the defrosting medium heating device.

[0012] The defrosting medium heating device described above is characterized in that the heat exchanger is connected with a defrosting medium flow path, which includes a defrosting medium supply pipeline and a defrosting medium return pipeline. The defrosting medium supply pipeline is arranged at the upper part and is used to supply the heated defrosting medium from the heater to the return air heat exchanger; the defrosting medium return pipeline is arranged at the lower part and is used to return the defrosting medium after defrosting in the return air heat exchanger to the heat exchanger. In the defrosting medium heating device, a space capable of accommodating a pump is provided vertically between the defrosting medium supply pipeline and the defrosting medium return pipeline.

[0013] The defrosting medium heating device described above is characterized in that the heat exchanger is connected with a heating medium flow path, which includes a heating medium supply pipeline and a heating medium return pipeline. The heating medium supply pipeline is arranged at the upper part and is used to supply the heating medium heated by the heater to the heat exchanger; the heating medium return pipeline is arranged at the lower part and is used to return the heating medium after heat exchange with the defrosting medium in the heat exchanger to the heater. The heating medium flow path connects the heat exchanger and the heater and is arranged as a pipeline in a U shape in the horizontal direction.

[0014] The defrosting medium heating device described above is characterized in that in the defrosting medium heating device, a space capable of accommodating a pump is provided vertically between the heating medium supply pipeline and the heating medium return pipeline.

[0015] The defrosting medium heating device described above is characterized in that in the defrosting medium heating device, a space capable of accommodating a pump is provided above the heating medium return pipeline.

[0016] The defrosting medium heating device described above is characterized in that in the horizontal direction in the defrosting medium heating device, the defrosting medium flow path is arranged near one side edge, the heating controller is arranged near the other side edge far from the defrosting medium flow path, and the heating medium flow path is arranged between the defrosting medium flow path and the heating controller.

[0017] The defrosting medium heating device described above is characterized in that the heat exchanger is further connected with an auxiliary heating medium flow path, which is used to supply the auxiliary heating medium heated by the auxiliary heating device to the heat exchanger and return the auxiliary heating medium after heat exchange with the defrosting medium in the heat exchanger to the auxiliary heating device.

[0018] The defrosting medium heating device described above is characterized in that the auxiliary heating medium flow path can be connected with the heating medium flow path.

[0019] Effect of the utility model

[0020] According to the defrosting medium heating device, the defrosting medium can be heated more efficiently to defrost the return air heat exchanger, and the space occupied by the whole defrosting medium heating device is optimized, heat loss is reduced and maintenance is facilitated. Description of the drawings

[0021] Figure 1 It is a schematic structural view showing the return air heat exchanger of the partition heat extraction heat pump system.

[0022] Figure 2 It is a top view showing the specific structure of the defrosting medium heating device.

[0023] Figure 3 It is a side view showing the specific structure of the defrosting medium heating device.

[0024] Figure 4 It is a top view showing the specific structure of a modified example of the defrosting medium heating device. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the present utility model clearer, the following will describe in detail the embodiments of the present utility model with reference to the drawings.

[0026] It should be clear that the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the scope of protection of the embodiments of the present utility model.

[0027] <Defrosting device structure>

[0028] In this embodiment, the return air heat exchanger 1 of the partition heat extraction heat pump system has a medium flow path (not shown), and this medium flow path can be used as a heat extraction medium flow path and a defrosting medium flow path. As Figure 1 shown, a medium outlet 101 and a medium inlet 102 are provided on one side of the return air heat exchanger 1.

[0029] The medium outlet 101 is connected to the medium inlet of the evaporator in a heat pump unit (not shown) via a heat extraction medium outlet pipeline. A defrosting medium outlet pipeline is branched from the heat extraction medium outlet pipeline. Preferably, a tee is provided at the branch.

[0030] On the other hand, the medium inlet 102 is connected to the medium outlet of the evaporator in a heat pump unit (not shown) via a heat extraction medium inlet pipeline. A defrosting medium inlet pipeline is branched from the heat extraction medium inlet pipeline. Preferably, a tee is provided at the branch.

[0031] In this embodiment, the medium outlet 101 can serve as the defrosting medium outlet and the heat extraction medium outlet, and the medium inlet 102 can serve as the defrosting medium inlet and the heat extraction medium inlet. Specifically, it is described as follows.

[0032] In the heat extraction mode, the heat extraction medium exchanges heat with the mine return air in the return air heat exchanger 1, so that the temperature of the heat extraction medium rises. The heat extraction medium with the increased temperature flows out from the medium outlet 101 of the return air heat exchanger 1, flows through the heat extraction medium outlet pipeline to the evaporator in the heat pump unit, and exchanges heat with the heat pump working medium in the evaporator, so that the temperature of the heat extraction medium drops. The heat extraction medium with the decreased temperature flows from the evaporator to the return air heat exchanger 1 via the heat extraction medium inlet pipeline and flows into the return air heat exchanger 1 from the medium inlet 102.

[0033] Thus, the heat extraction medium circulates in the heat extraction medium loop composed of the medium flow path in the return air heat exchanger 1, the heat extraction medium outlet pipeline, the evaporator, and the heat extraction medium inlet pipeline, realizing the extraction of the waste heat of the mine return air and transferring the heat to the heat pump working medium in the heat pump unit.

[0034] On the other hand, in the defrosting mode, the defrosting medium defrosts the return air heat exchanger 1, so that the temperature of the defrosting medium drops. The defrosting medium with the decreased temperature flows out from the medium outlet 101 of the return air heat exchanger 1, and flows through a part of the heat extraction medium outlet pipeline and the defrosting medium outlet pipeline to the defrosting medium heating device. The defrosting medium is heated in the defrosting medium heating device so that the temperature rises. The defrosting medium with the increased temperature flows from the defrosting medium heating device to the return air heat exchanger 1 via the defrosting medium inlet pipeline and a part of the heat extraction medium inlet pipeline, and flows into the return air heat exchanger 1 from the medium inlet 102.

[0035] Thus, the defrosting medium circulates in the defrosting medium loop composed of the medium flow path in the return air heat exchanger 1, a part of the heat extraction medium outlet pipeline, the defrosting medium outlet pipeline, the defrosting medium heating device, the defrosting medium inlet pipeline, and a part of the heat extraction medium inlet pipeline, realizing the defrosting of the return air heat exchanger 1. For the convenience of understanding, sometimes the defrosting medium outlet pipeline and the defrosting medium inlet pipeline are collectively referred to as the defrosting medium flow path hereinafter.

[0036] <Specific structure of the defrosting medium heating device>

[0037] Figure 2 It is a top view showing the specific structure of the defrosting medium heating device 2. Figure 3It is a side view showing the specific structure of the defrosting medium heating device. The defrosting medium heating device 2 includes: a heat exchanger 21 for exchanging heat between the defrosting medium and other heat media; a heater 22 for heating the heating medium; and a heating controller 23 for controlling the defrosting medium heating device 2. The defrosting medium flow path connects the heat exchanger 21 to the return air heat exchanger 1 and is used for circulating the defrosting medium. As shown in the figure, in order to optimize the space occupied by the entire defrosting medium heating device, an intensive design is carried out on the defrosting medium heating device 2, and the heat exchanger 21, the heater 22, and the heating controller 23 are integrally arranged in the defrosting medium heating device 2.

[0038] The heat exchanger 21 is connected with a defrosting medium flow path and a heating medium flow path, and pumps are respectively arranged in the defrosting medium flow path and the heating medium flow path. Figure 2 In [the figure], the illustration of the pump is simplified for easy understanding. The defrosting medium flow path connects the heat exchanger 21 to the return air heat exchanger 1 and is used for circulating the defrosting medium.

[0039] The heating medium flow path connects the heat exchanger 21 to the heater 22 and is used for circulating the heating medium. The heating medium flow path includes a heating medium supply pipeline and a heating medium return pipeline. After the heating medium is heated by the heater 22, its temperature rises, and the heated heating medium is supplied to the heat exchanger 21 through the heating medium supply pipeline. In the heat exchanger 21, after the heating medium exchanges heat with the defrosting medium, its temperature drops, and the cooled heating medium returns to the heater 22 through the heating medium return pipeline.

[0040] The defrosting medium flow path is arranged near one side edge inside the defrosting medium heating device 2 and includes a defrosting medium supply pipeline and a defrosting medium return pipeline. The defrosting medium flow path is connected to the heat exchanger 21 in a bottom-in and top-out connection manner. That is, the defrosting medium supply pipeline is connected to the upper end of a vertical side of the heat exchanger 21 for supplying the heated defrosting medium to the return air heat exchanger, and the defrosting medium return pipeline is connected to the lower end of the same vertical side of the heat exchanger 21 for returning the defrosted defrosting medium to the heat exchanger. A space capable of accommodating a pump is provided vertically between the defrosting medium supply pipeline and the defrosting medium return pipeline.

[0041] In order to optimize the space occupied by the entire defrosting medium heating device, the heat exchanger 21 and the heater 22 are arranged side by side in the heat exchanger 21, and the heating medium flow path is arranged as a U-shaped pipeline in the horizontal direction. The heating medium flow path is connected to the heat exchanger 21 in an upper-in and lower-out connection manner. That is, the heating medium supply pipeline is connected to the upper end of a vertical side of the heat exchanger 21, and the heating medium return pipeline is connected to the lower end of the same vertical side of the heat exchanger 21. A space capable of accommodating a pump is formed vertically between the heating medium supply pipeline and the heating medium return pipeline.

[0042] Near the other side edge within the defrosting medium heating device 2, that is, near the side edge far from the defrosting medium flow path, a heating controller 23 is provided. According to such a defrosting medium heating device 2, the structure can be simplified and it is easy to manufacture. Moreover, the number of pipelines and pumps can be reduced, facilitating on-site accommodation and maintenance, thereby reducing material costs and labor costs.

[0043] In addition, within the defrosting medium heating device 2, the heating medium supply pipeline and the heating medium return pipeline, which are arranged in a U-shaped pipeline in the horizontal direction, can be of the same size. However, it is also possible that the length of the heating medium supply pipeline arranged vertically above protruding in the horizontal direction is shorter than the length of the heating medium return pipeline arranged vertically below protruding in the horizontal direction. Thus, more space can be left above within the defrosting medium heating device 2. In this way, when a large-sized pump needs to be vertically installed in the defrosting medium heating device 2, even if the defrosting medium heating device does not increase in volume, the pump and the pipeline will not interfere with each other, thereby further optimizing the spatial layout.

[0044] The defrosting medium and the heating medium can be the same medium or different media. Preferably, it is a medium with a large specific heat, small density, good thermal conductivity, high safety, and environmental friendliness. Particularly preferably, it is an ethylene glycol solution.

[0045] <Variant Example>

[0046] Figure 4 It is a top view showing the specific structure of a variant example of the defrosting medium heating device. The difference between the variant example and Figure 2 the illustrated embodiment is that in addition to being connected to the defrosting medium flow path and the heating medium flow path, the heat exchanger 21 is also connected to an auxiliary heating medium flow path.

[0047] The auxiliary heating medium flow path connects the heat exchanger 21 to an auxiliary heating device (not shown) and is used to circulate the auxiliary heating medium. The auxiliary heating medium is heated in the auxiliary heating device and its temperature rises. The auxiliary heating medium with the increased temperature is supplied to the heat exchanger 21 through the auxiliary heating medium supply pipeline. In the heat exchanger 21, after the auxiliary heating medium exchanges heat with the defrosting medium, its temperature drops, and the auxiliary heating medium with the decreased temperature returns to the auxiliary heating device through the heating medium return pipeline.

[0048] The auxiliary heating medium can be, for example, a medium returned from a heat pump unit or a user terminal, and there is no particular limitation. The auxiliary heating medium and the heating medium can be the same medium or different media. Preferably, it is a medium with a large specific heat, small density, good thermal conductivity, high safety, and environmental friendliness. Particularly preferably, it is an ethylene glycol solution. In the case where the auxiliary heating medium and the heating medium are the same medium, the heating medium flow path and the auxiliary heating medium flow path can be a common flow path.

[0049] Figure 4 It is shown that the heating medium flow path and the auxiliary heating medium flow path are connected to the heat exchanger 21 through the same interface, whereby the number of interfaces can be reduced, and it is not easy for the pump and the pipeline to interfere with each other, so that the spatial distribution can be further optimized. However, it is not limited thereto, and the heating medium flow path and the auxiliary heating medium flow path may also be connected to the heat exchanger 21 through different interfaces.

[0050] Figures 2 - 4 It is shown that the inlets and outlets of the respective pipelines are at the same height, but it is not limited thereto, and the inlets and outlets of the respective pipelines may also be at different heights, as long as there is enough space to set the pump. In this way, the space occupied by the defrosting medium heating device as a whole can also be optimized, heat loss can be reduced, and maintenance is facilitated.

[0051] <Heating process>

[0052] A temperature sensor (not shown) is provided in the heat exchanger 21, and the temperature sensor is used to measure the temperature of the heat exchanger 21. However, it is not limited thereto, and a temperature sensor may also be provided in the heater 22, and / or temperature sensors may be provided in both the heating medium flow path and the auxiliary heating medium flow path, without any particular limitation.

[0053] When the defrosting medium with a reduced temperature flows from the return air heat exchanger 1 to the heat exchanger 21, the temperature of the heat exchanger 21 drops. When the temperature of the heat exchanger 21 drops to a predetermined threshold temperature, the heating controller 23 starts the heater 22 and the auxiliary heating device and makes the heating medium flow path and the auxiliary heating medium flow path conduct, and the heating medium and the auxiliary heating medium flow through the heat exchanger 21 and exchange heat with the defrosting medium.

[0054] The heat exchanger 21 may be, for example, various heat exchangers or a combination of heat exchangers such as a plate heat exchanger or a shell-and-tube heat exchanger installed vertically, without any particular limitation. The heater 22 may be various heaters or a combination of heaters such as an electric heater or a gas heater, without any particular limitation.

[0055] The above are only the embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. For example, in the embodiments, other components such as pumps, thermometers, pressure gauges, and flow meters may also be provided in each medium flow path.

Claims

1. A defrost medium heating device, used for defrosting a return air heat exchanger in a partition-type heat extraction heat pump system, wherein the return air heat exchanger comprises a defrost medium flow path, wherein the defrost medium flowing in the defrost medium flow path is used for defrosting, and the defrost medium whose temperature is lowered after defrosting is heated by the defrost medium heating device and flows back to the return air heat exchanger, The defrosting medium heating device is characterized in that: have: a heat exchanger for exchanging heat between the defrosting medium and a heating medium; a heater that heats the heating medium; and a heating controller, which controls the defrost medium heating device, The heat exchanger and the heater are arranged side by side on the defrost medium heating device.

2. The defrosting medium heating device according to claim 1, characterized in that: The heat exchanger is connected to the defrost medium flow path, and the defrost medium flow path includes a defrost medium supply pipeline and a defrost medium return pipeline. The defrost medium supply pipeline is arranged at an upper position, and is used to supply the heated defrost medium from the heater to the return air heat exchanger; the defrost medium return pipeline is arranged at a lower position, and is used to return the defrost medium after defrosting in the return air heat exchanger to the heat exchanger. In the defrost medium heating device, a space capable of accommodating a pump is provided in a vertical direction between the defrost medium supply pipeline and the defrost medium return pipeline.

3. The defrosting medium heating device according to claim 2, characterized in that: The heat exchanger is connected to a heating medium flow path, and the heating medium flow path includes a heating medium supply pipeline and a heating medium return pipeline. The heating medium supply pipeline is arranged at an upper position, and is used to supply the heating medium heated by the heater to the heat exchanger; the heating medium return pipeline is arranged at a lower position, and is used to return the heating medium to the heater after heat exchange with the defrosting medium in the heat exchanger. The heating medium flow path connects the heat exchanger and the heater and is provided as a U-shaped pipeline in the horizontal direction.

4. The defrosting medium heating device according to claim 3, characterized in that: In the defrost medium heating device, a space capable of accommodating a pump is provided in a vertical direction between the heating medium supply pipeline and the heating medium return pipeline.

5. The defrosting medium heating device according to claim 3, characterized in that: In the defrost medium heating device, a space capable of accommodating a pump is provided above the heating medium return pipeline.

6. The defrosting medium heating device according to claim 3, characterized in that: In the horizontal direction within the defrost medium heating device, the defrost medium flow path is arranged near one side edge, the heating controller is arranged near the other side edge away from the defrost medium flow path, and the heating medium flow path is arranged between the defrost medium flow path and the heating controller.

7. The defrosting medium heating device according to claim 3, characterized in that: The heat exchanger is also connected to an auxiliary heating medium flow path, which is used to supply the auxiliary heating medium heated by the auxiliary heating device to the heat exchanger and return the auxiliary heating medium to the auxiliary heating device after heat exchange with the defrost medium in the heat exchanger.

8. The defrosting medium heating device according to claim 7, characterized in that: The auxiliary heating medium flow path can communicate with the heating medium flow path.

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