Winter ventilation system for underground coal transportation corridor using waste heat from heating return water

Abstract

The utility model discloses a winter ventilation system for underground coal transportation corridors using waste heat of heating return water, including ventilation ducts, a corridor ventilation air inlet is provided at the top of the ventilation duct, air inlet shutters are installed around the corridor ventilation air inlet, an air inlet grate is installed on the bottom surface of the corridor ventilation air inlet, an air supply fan is arranged in the ventilation duct, the air supply fan is located below the air inlet grate, a heat exchanger is arranged below the air supply fan, a temperature sensor is arranged below the heat exchanger, a pipeline air supply port is provided at the bottom of the ventilation duct, an air outlet electric air valve is installed at the pipeline air supply port, and the pipeline air supply port is communicated with the underground coal transportation corridor. The utility model combines the characteristics of winter ventilation and the characteristics of industrial heating of the coal transportation corridor, recovers the waste heat in the heating return water to heat the cold air entering from the outside of the ventilation duct, and the heated air is passed into the underground coal transportation corridor through the ventilation duct, so as to realize the ventilation of the underground coal transportation corridor in winter.

Description

Technical Field

[0001] The utility model relates to the technical field of energy utilization and ventilation, and in particular to a winter ventilation system for underground coal transportation corridors which utilizes waste heat of heating return water. Background Art

[0002] The coal transportation system refers to the coal transportation equipment and its control equipment from the coal unloading point to the coal yard and from the coal yard to the boiler coal bunker. Many power plants use coal unloading ditches to unload coal and underground corridors to load coal. In the underground coal transportation corridors in the north in winter, due to the low ambient temperature, heating usually uses hot water with higher temperature to heat the coal transportation corridors. The heating return water temperature is generally high. It is understood that some power plants use steam heating to heat the coal transportation corridors, and a large amount of heat is not fully utilized. In addition, due to the closed environment and poor ventilation, the underground coal transportation corridors are humid, which is prone to equipment corrosion. At the same time, due to the long-term closed environment and low oxygen content, there is a personal risk for operation and maintenance personnel. In summer, the corridor can be ventilated through ventilation holes, but in winter, if the air is exhausted outward, a large amount of heat will be brought into the corridor; if the air is ventilated inward, cold air will enter the coal transportation corridor with a higher temperature, which will lower the temperature in the corridor and easily condense into water on the equipment, causing corrosion and damage to the equipment. Therefore, the cold air inhaled by the ventilation needs to be heated. The traditional heating and ventilation method not only consumes a lot of energy, but also has low efficiency and cannot effectively utilize the waste heat resources of the heating system. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a winter ventilation system for underground coal transportation corridors that utilizes waste heat from heating return water and has a rational structural design. By recovering the waste heat from the heating return water and preheating the air used for ventilation, the utility model can provide good ventilation effect for the closed environment of the underground coal transportation corridor in winter.

[0004] The technical solution adopted by the utility model to solve the above-mentioned problems is: a winter ventilation system for an underground coal transportation gallery using waste heat from heating return water, characterized in that it comprises a ventilation duct, a gallery ventilation air inlet is provided at the top of the ventilation duct, air inlet louvers are installed around the gallery ventilation air inlet, an air inlet grate is installed on the bottom surface of the gallery ventilation air inlet, an air supply fan is arranged in the ventilation duct, the air supply fan is located below the air inlet grate, a heat exchanger is arranged below the air supply fan, a temperature sensor is arranged below the heat exchanger, a duct air supply port is provided at the bottom end of the ventilation duct, an air outlet electric air valve is installed at the duct air supply port, and the duct air supply port is communicated with the underground coal transportation gallery.

[0005] Furthermore, the primary side water inlet of the heat exchanger is connected to the heating return water pipe input port through the water inlet pipe, and an electric gate valve, an electric regulating valve, a flow meter and a pressure gauge are installed in sequence on the water inlet pipe; the primary side water outlet of the heat exchanger is connected to the heating return water pipe output port through the return water pipe, and a check valve is installed on the return water pipe; an electric gate valve is installed between the heating return water pipe input port and the heating return water pipe output port.

[0006] Furthermore, the primary side pipe and the secondary side pipe of the heat exchanger are connected to the heating return water pipe, and the heating return water pipe is connected to the return water side of the heating system for extracting heat from the heating return water to heat the cold air in the ventilation duct.

[0007] Furthermore, the heat exchanger is a plate heat exchanger.

[0008] Furthermore, the air supply fan is used to drive air flow and adjust ventilation air volume.

[0009] Furthermore, the air outlet electric air valve can be closed when ventilation is not required to prevent coal powder from diffusing and depositing in the ventilation duct.

[0010] Furthermore, the air inlet louvers can prevent debris in the air from entering the ventilation duct, and the air inlet louvers can be closed.

[0011] Furthermore, the air inlet grate can filter dust with smaller particle sizes in the air, and can be replaced with a fully enclosed grate when the system is not in operation to prevent debris from entering.

[0012] Furthermore, the temperature sensor can monitor the ventilation temperature and dynamically adjust the working state of the ventilation system according to the ventilation temperature entering the underground coal transportation gallery to maintain the ventilation temperature in the underground coal transportation gallery.

[0013] Furthermore, by effectively utilizing the waste heat of heating return water, the internal environment of the underground coal transportation corridor is regulated, the energy utilization efficiency is improved, the operating cost is reduced, and the safety inside the underground coal transportation corridor and the comfort of the working environment are ensured.

[0014] Compared with the prior art, the utility model has the following advantages and effects: the return water for heating in the underground coal transportation gallery is introduced into the heat exchanger for heat exchange, and the remaining heat is absorbed by the heat exchanger and transferred to the air in the ventilation duct. After the fan is started, the air is driven to flow in the ventilation duct, and the air heated by the heat exchanger is sent into the underground coal transportation gallery, which can be ventilated for the underground coal transportation gallery during the cold winter period. According to the temperature in the ventilation duct, the operating state of the fan and the opening of the electric regulating valve on the primary side water supply pipeline of the heat exchanger are adjusted to ensure the heat exchange efficiency of the heat exchanger in the ventilation duct and the ventilation effect of the underground coal transportation gallery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall layout of the underground coal transportation gallery in the utility model.

[0016] Figure 2 It is a cross-sectional view of the ventilation system of the underground coal conveying gallery in the utility model.

[0017] In the figure: corridor ventilation air inlet 1, air inlet louver 2, air inlet grate 3, air supply fan 4, heat exchanger 5, ventilation duct 6, temperature sensor 7, air outlet electric air valve 8, duct air supply outlet 9, pressure gauge 10, flow meter 11, electric regulating valve 12, electric gate valve 13, check valve 14, heating package group 15, coal conveyor belt system 16, coal feeder system 17, coal unloading ditch 18, underground coal conveyor gallery 19. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0019] Example

[0020] See also Figure 1 to Figure 2 In the present embodiment, a winter ventilation system for an underground coal transportation gallery using waste heat from heating return water is provided, comprising a ventilation duct 6, a gallery ventilation air inlet 1 is provided at the top of the ventilation duct 6, air inlet louvers 2 are installed around the gallery ventilation air inlet 1, an air inlet grate 3 is installed on the bottom surface of the gallery ventilation air inlet 1, an air supply fan 4 is arranged in the ventilation duct 6, the air supply fan 4 is located below the air inlet grate 3, a heat exchanger 5 is arranged below the air supply fan 4, a temperature sensor 7 is arranged below the heat exchanger 5, a duct air supply port 9 is provided at the bottom end of the ventilation duct 6, an air outlet electric air valve 8 is installed at the duct air supply port 9, and the duct air supply port 9 is communicated with the underground coal transportation gallery 19.

[0021] The primary water inlet of the heat exchanger 5 is connected to the input port of the heating return water pipeline through the water inlet pipeline, and an electric gate valve 13, an electric regulating valve 12, a flow meter 11, and a pressure gauge 10 are installed in sequence on the water inlet pipeline; the primary water outlet of the heat exchanger 5 is connected to the output port of the heating return water pipeline through the return water pipeline, and a check valve 14 is installed on the return water pipeline; an electric gate valve 13 is installed between the input port of the heating return water pipeline and the output port of the heating return water pipeline.

[0022] Specifically, the air inlet louver 2 can prevent debris in the air from entering the ventilation duct 6, and the air inlet louver 2 can be closed. The air inlet grate 3 can filter dust with smaller particle size in the air, and can be replaced with a fully enclosed grate when the system is not in operation to prevent debris from entering. The air supply fan 4 adopts a variable frequency fan to drive air flow and realize ventilation air volume adjustment. The heat exchanger 5 is a plate heat exchanger, and the primary side pipe and the secondary side pipe of the heat exchanger 5 are connected to the heating return water pipe, and the heating return water pipe is connected to the return water side of the heating system, which is used to extract heat from the heating return water and heat the cold air in the ventilation duct 6. The temperature sensor 7 can monitor the ventilation temperature and control the air supply volume and temperature by adjusting the electric regulating valve 12 and the air supply fan 4. The working state of the ventilation system is dynamically adjusted according to the ventilation temperature entering the underground coal transportation corridor 19 to maintain the ventilation temperature in the underground coal transportation corridor 19. The air outlet electric air valve 8 can be closed when ventilation is not required to prevent coal powder from diffusing and depositing in the ventilation duct 6.

[0023] When the outside temperature is low in winter and ventilation is required, the electric gate valve 13 on the water inlet pipeline is opened, the electric regulating valve 12 is fully opened, and the other electric gate valve 13 is closed, so that the heating return water passes through the heat exchanger 5 to heat the air in the ventilation duct 6. The air outlet electric air valve 8 is opened, and the air supply fan 4 is turned on. The outdoor air enters from the corridor ventilation air inlet 1, is heated by the heat exchanger 5, and enters the underground coal transportation corridor 19 through the pipeline air supply port 9, so that the underground coal transportation corridor 19 is ventilated in winter.

[0024] When ventilation is not required, close the electric gate valve 13 on the water inlet pipeline, open another electric gate valve 13, close the electric regulating valve 12, close the air outlet electric air valve 8, and replace the air inlet grate 3 with a fully enclosed cover. A check valve 14 is set on the return water pipeline of the heat exchanger 5 to prevent the heating return water from entering the heat exchanger 5 when the system is not put into operation.

[0025] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0026] In addition, it should be noted that the above content described in this specification is only an example of the structure of the utility model. All equivalent changes made based on the structure, features and principles described in the utility model patent are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications, supplements or replace the specific embodiments described in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A winter ventilation system for underground coal transportation corridors using waste heat from heating return water, characterized in that: The invention comprises a ventilation duct (6), wherein a gallery ventilation air inlet (1) is provided at the top of the ventilation duct (6), air inlet shutters (2) are installed around the gallery ventilation air inlet (1), an air inlet grate (3) is installed on the bottom surface of the gallery ventilation air inlet (1), an air supply fan (4) is arranged in the ventilation duct (6), the air supply fan (4) is located below the air inlet grate (3), a heat exchanger (5) is arranged below the air supply fan (4), a temperature sensor (7) is arranged below the heat exchanger (5), a duct air supply port (9) is provided at the bottom end of the ventilation duct (6), an air outlet electric air valve (8) is installed at the duct air supply port (9), and the duct air supply port (9) is communicated with an underground coal transportation gallery (19).

2. The winter ventilation system for underground coal transportation corridor using waste heat from heating return water according to claim 1 is characterized in that: The primary water inlet of the heat exchanger (5) is connected to the input port of the heating return water pipeline via an inlet pipeline, and an electric gate valve (13), an electric regulating valve (12), a flow meter (11), and a pressure gauge (10) are installed in sequence on the inlet pipeline; the primary water outlet of the heat exchanger (5) is connected to the output port of the heating return water pipeline via a return water pipeline, and a check valve (14) is installed on the return water pipeline; an electric gate valve (13) is installed between the input port of the heating return water pipeline and the output port of the heating return water pipeline.

3. The winter ventilation system for underground coal transportation corridor using waste heat from heating return water according to claim 1 is characterized in that: The air inlet louver (2) is used to prevent debris in the air from entering the ventilation duct (6), and the air inlet louver (2) can be closed.

4. The winter ventilation system for underground coal transportation corridor using waste heat from heating return water according to claim 1 or 2, characterized in that: The heat exchanger (5) is a plate heat exchanger.

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