Coal mine underground mine water waste heat utilization system

Abstract

The invention belongs to the technical field of mine water waste heat collection and utilization, and provides a coal mine underground mine water waste heat utilization system which is used for collecting and utilizing waste heat in mine water. According to the technical scheme, the coal mine underground mine water waste heat utilization system comprises a mine bottom water sump, an auxiliary shaft, a sewage pipe, a sewage pump and a heat pump system, the auxiliary shaft is arranged in a mine area, the bottom of the auxiliary shaft is provided with the mine bottom water sump used for storing mine water, the sewage pipe is arranged in the auxiliary shaft, the bottom end of the sewage pipe extends into the mine bottom water sump, and the heat pump system is connected with the sewage pipe. The upper end of the sewage pipe extends out of the ground and is connected with a heat energy medium inlet of the heat pump system, a heat energy medium outlet of the heat pump system is connected with the discharge pipe, the sewage pump is mounted on the sewage pipe, and the heat energy medium outlet of the heat pump system is connected with the sewage treatment equipment through the discharge pipe; by the adoption of the system, heat energy in mine water with waste heat can be effectively replaced and extracted and used for a heat pump system for resident life, and the adopted system equipment is low in manufacturing cost, energy-saving and environment-friendly.

Description

Technical Field

[0001] The invention discloses a system for utilizing waste heat of underground coal mine water, and belongs to the technical field of collecting and utilizing waste heat of underground coal mine water. Background Art

[0002] Mine water is water formed during the coal mining process. During the coal mining process, groundwater comes into contact with coal seams and rock strata, and coupled with the influence of human activities, a series of physical, chemical and biochemical reactions occur. As a result, the water quality has significant coal industry characteristics: the suspended matter content of mine water is much higher than that of surface water, and the sensory properties are poor; and the suspended matter contained in it has a small particle size, light specific gravity, slow sedimentation rate, and poor coagulation effect; mine water also contains organic pollutants such as waste engine oil and emulsified oil.

[0003] During the production process, a large amount of waste heat is generated in the mine, and the mine water also contains a large amount of waste heat. The water temperature from underground drainage to the outlet of the surface water treatment station is as low as 24°C in winter and 28°C in summer. In the past, these mine waters were discharged to the surface and discharged after being treated by water treatment devices to meet the standards. For a long time, this part of waste heat resources has not been fully utilized, which not only caused energy waste, but also had a negative impact on the environment. Summary of the invention

[0004] In order to solve one of the above technical defects, the present invention provides a coal mine underground mine water waste heat utilization system, which collects and utilizes the waste heat in the mine water with low cost.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a coal mine underground mine water waste heat utilization system, including a bottom water tank, an auxiliary shaft, a sewage pipe, a sewage pump and a heat pump system. The auxiliary shaft is arranged in the mine area and a bottom water tank for storing mine water is arranged at the bottom thereof. The sewage pipe is arranged in the auxiliary shaft, the bottom end of the sewage pipe extends into the bottom water tank, the upper end of the sewage pipe extends out of the ground and is connected to the thermal energy medium inlet of the heat pump system, the thermal energy medium outlet of the heat pump system is connected to the discharge pipe, and the sewage pump is installed on the sewage pipe.

[0006] The heat energy medium outlet of the heat pump system is connected to the sewage treatment equipment through a discharge pipe.

[0007] A shell-and-tube heat exchanger is installed between the sewage pump of the sewage pipe and the heat pump system, the tube-side inlet of the shell-and-tube heat exchanger is connected to the sewage pipe, the tube-side outlet of the shell-and-tube heat exchanger is connected to the discharge pipe, the shell-side inlet of the shell-and-tube heat exchanger is connected to the thermal energy medium outlet of the heat pump system through a pipeline, the thermal energy medium inlet of the heat pump system is connected to the shell-side outlet of the shell-and-tube heat exchanger through a pipeline, the shell side of the shell-and-tube heat exchanger and the heat pump system constitute a medium circulation loop, and liquid medium circulates in the medium circulation loop and a circulation pump is installed on the medium circulation loop.

[0008] The tube outlet of the shell and tube heat exchanger is connected to the sewage treatment equipment through a discharge pipe.

[0009] A sludge settler is installed between the sewage pump of the sewage pipe and the shell-and-tube heat exchanger. The top inlet of the sludge settler is connected to the sewage pipe. A clean water outlet is provided at the bottom of the sludge settler. The clean water outlet is connected to the tube-side inlet of the shell-and-tube heat exchanger through a pipeline and a clean water pump is provided on the pipeline. A sludge outlet is provided at the bottom end of the sludge settler. The tube-side outlet of the shell-and-tube heat exchanger is connected to an industrial water collecting tank.

[0010] The sludge outlet of the sludge settler is connected to a sludge discharge tank or sewage treatment equipment through a pipeline.

[0011] The outer wall of the sludge sedimentation tank is coated with a heat-insulating layer.

[0012] An impurity filter is arranged at the upper inner part of the sludge settler, the impurity filter is located below the top inlet of the sludge settler and above the lower clean water outlet of the sludge settler, and a detachable cover is arranged at the top of the sludge settler.

[0013] The sewage pump is located below the discharge outlet of the equipment to which the sewage pipe is directly connected.

[0014] The coal mine water waste heat utilization system provided by the present invention can effectively replace and extract the heat energy in the mine water with waste heat and use it in the heat pump system used for residents' lives. The system equipment used has low cost and is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings;

[0016] Figure 1 A schematic diagram of the structure provided in Embodiment 1 of the present invention;

[0017] Figure 2 A schematic diagram of the structure provided for the second embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the third embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] Embodiment 1

[0021] like Figure 1 As shown, the coal mine underground mine water waste heat utilization system includes a bottom water tank 1, an auxiliary shaft 2, a sewage pipe 3, a sewage pump 4 and a heat pump system 5. The auxiliary shaft 2 is arranged in the mine area and a bottom water tank 1 for storing mine water is arranged at the bottom thereof. The sewage pipe 3 is arranged in the auxiliary shaft 2, and the bottom end of the sewage pipe 3 extends into the bottom water tank 1, and the upper end of the sewage pipe 3 extends out of the ground and is connected to the thermal energy medium inlet of the heat pump system 5. The thermal energy medium outlet of the heat pump system 5 is connected to the discharge pipe, and the sewage pump 4 is installed on the sewage pipe 3.

[0022] The thermal energy medium outlet of the heat pump system 5 is connected to the sewage treatment equipment 6 through a discharge pipe.

[0023] In this embodiment, the mine water with waste heat collected in the bottom water tank 1 is directly pumped by the sewage pump 4 through the sewage pipe 3 and sent to the heat pump system, and the waste heat is directly applied to the heat pump system. The system is simple and low-cost. The sewage after the waste heat is collected by the heat pump system 5 is sent to the sewage treatment equipment 6 through the discharge pipe, and discharged after conventional sewage treatment, which reduces energy waste and reduces some negative impacts of mine water discharge treatment on the environment.

[0024] A heat pump is an efficient and energy-saving device that makes full use of low-grade thermal energy. The working principle of a heat pump is a mechanical device that forces heat to flow from a low-temperature object to a high-temperature object in a reverse cycle. It consumes only a small amount of reverse cycle net work to obtain a large amount of heat supply, and can effectively utilize the difficult-to-apply low-grade thermal energy to achieve energy-saving purposes. The use of a heat pump can quickly and effectively extract and collect waste heat from mine water and apply it to residents' daily lives. The heat pump system described in this embodiment is a direct use of existing mature technology, so its specific structure and functional implementation method are not described in detail in this application.

[0025] Embodiment 2

[0026] like Figure 2 As shown, on the basis of Example 1, a shell-and-tube heat exchanger 7 is installed between the sewage pump 4 of the sewage pipe 3 and the heat pump system 5, the tube-side inlet of the shell-and-tube heat exchanger 7 is connected to the sewage pipe 3, the tube-side outlet of the shell-and-tube heat exchanger 7 is connected to the discharge pipe, the shell-side inlet of the shell-and-tube heat exchanger 7 is connected to the thermal energy medium outlet of the heat pump system 5 through a pipeline, the thermal energy medium inlet of the heat pump system 5 is connected to the shell-side outlet of the shell-and-tube heat exchanger 7 through a pipeline, the shell side of the shell-and-tube heat exchanger 7 and the heat pump system 5 constitute a medium circulation loop, and liquid medium flows in the medium circulation loop and a circulation pump 8 is installed on the medium circulation loop.

[0027] The tube outlet of the shell-and-tube heat exchanger 7 is connected to the sewage treatment equipment 6 through a discharge pipe.

[0028] The difference between this embodiment and the first embodiment is that the mine water is not directly used in the heat pump system 5, but the shell and tube heat exchanger 7 is used to replace the waste heat in the mine water with a thermal energy medium (such as clean water). After the mine water replaces the waste heat with the thermal energy medium, it is sent to the sewage treatment equipment 6 through the discharge pipe for conventional sewage treatment and then discharged, and the thermal energy medium that fully absorbs the waste heat is sent to the heat pump system 5 for utilization. In addition, since the shell side of the shell and tube heat exchanger 7 and the heat pump system 5 constitute a medium circulation loop, the thermal energy medium repeatedly enters the shell and tube heat exchanger 7 under the action of the circulation pump 8 to absorb heat energy and is sent to the heat pump system 5. In this embodiment, the number of times the heat pump system 5 is shut down for maintenance and cleaning can be effectively reduced, and the difficulty of maintenance and cleaning of the shell and tube heat exchanger 7 is lower than that of the heat pump system 5.

[0029] Embodiment 3

[0030] like Figure 3 As shown, on the basis of Example 2, a sludge settler 9 is installed between the sewage pump 4 of the sewage pipe 3 and the shell-and-tube heat exchanger 7, the top inlet of the sludge settler 9 is connected to the sewage pipe 3, and a clean water outlet is provided at the bottom of the sludge settler 9, the clean water outlet is connected to the tube side inlet of the shell-and-tube heat exchanger 7 through a pipeline and a clean water pump 12 is provided on the pipeline, a sludge outlet is provided at the bottom end of the sludge settler 9, and the tube side outlet of the shell-and-tube heat exchanger 7 is connected to an industrial water collecting tank 10.

[0031] The sludge outlet of the sludge settler 9 is connected to a sludge discharge tank or a sewage treatment device 6 through a pipeline.

[0032] The outer wall of the sludge settler 9 is covered with a heat-insulating layer to prevent the waste heat from being lost during the sedimentation process.

[0033] An impurity filter screen 11 is provided in the upper part of the sludge settler 9, and the impurity filter screen 11 is located below the top inlet of the sludge settler 9 and above the lower clean water outlet of the sludge settler 9. A detachable cover is provided on the top of the sludge settler 9. The impurity filter screen 11 can filter larger impurities in the mine water and regularly open the detachable cover to clean the impurities on the impurity filter screen to prevent larger impurities from clogging the bottom sludge outlet of the sludge settler 9 after precipitation.

[0034] The difference between this embodiment and the second embodiment is that the mine water is first preliminarily precipitated in the sludge sedimentator 9. After the sludge and other impurities in the mine water are precipitated, the upper water carries the waste heat into the tube side of the shell and tube heat exchanger 7, exchanges the heat energy to the heat energy medium, and then is sent to the industrial water collecting tank 10. The collected water inside the industrial water collecting tank 10 can be used for industrial use, and the precipitated sludge can be directly discharged into the sludge discharge pool through a pipeline, or sent to the sewage treatment equipment 6 for further treatment as sewage, depending on its actual discharge water content.

[0035] In the above three embodiments, the sewage pump 4 is located lower than the discharge outlet of the equipment to which the sewage pipe 3 is directly connected.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The coal mine water waste heat utilization system is characterized by: The invention comprises a bottom water tank (1), an auxiliary shaft (2), a sewage pipe (3), a sewage pump (4) and a heat pump system (5); the auxiliary shaft (2) is arranged in a mine area and has a bottom water tank (1) for storing mine water at its bottom; the sewage pipe (3) is arranged in the auxiliary shaft (2); the bottom end of the sewage pipe (3) extends into the bottom water tank (1); the upper end of the sewage pipe (3) extends out of the ground and is connected to the heat energy medium inlet of the heat pump system (5); the heat energy medium outlet of the heat pump system (5) is connected to a discharge pipe; and the sewage pump (4) is installed on the sewage pipe (3).

2. The coal mine water waste heat utilization system according to claim 1, characterized in that: The heat energy medium outlet of the heat pump system (5) is connected to the sewage treatment equipment (6) via a discharge pipe.

3. The coal mine water waste heat utilization system according to claim 1, characterized in that: A shell-and-tube heat exchanger (7) is installed between the sewage pump (4) of the sewage pipe (3) and the heat pump system (5); the tube side inlet of the shell-and-tube heat exchanger (7) is connected to the sewage pipe (3); the tube side outlet of the shell-and-tube heat exchanger (7) is connected to the discharge pipe; the shell side inlet of the shell-and-tube heat exchanger (7) is connected to the heat energy medium outlet of the heat pump system (5) through a pipeline; the heat energy medium inlet of the heat pump system (5) is connected to the shell side outlet of the shell-and-tube heat exchanger (7) through a pipeline; the shell side of the shell-and-tube heat exchanger (7) and the heat pump system (5) form a medium circulation loop; a liquid medium circulates in the medium circulation loop; and a circulation pump (8) is installed on the medium circulation loop.

4. The coal mine water waste heat utilization system according to claim 3, characterized in that: The tube outlet of the shell-and-tube heat exchanger (7) is connected to the sewage treatment equipment (6) via a discharge pipe.

5. The coal mine water waste heat utilization system according to claim 3, characterized in that: A sludge settler (9) is installed between the sewage pump (4) of the sewage pipe (3) and the shell-and-tube heat exchanger (7); the top inlet of the sludge settler (9) is connected to the sewage pipe (3); a clean water outlet is provided at the bottom of the sludge settler (9); the clean water outlet is connected to the tube-side inlet of the shell-and-tube heat exchanger (7) through a pipeline and a clean water pump (12) is provided on the pipeline; a sludge outlet is provided at the bottom end of the sludge settler (9); and the tube-side outlet of the shell-and-tube heat exchanger (7) is connected to an industrial water collecting tank (10).

6. The coal mine water waste heat utilization system according to claim 5, characterized in that: The sludge outlet of the sludge sedimentation tank (9) is connected to a sludge discharge tank or a sewage treatment device (6) via a pipeline.

7. The coal mine water waste heat utilization system according to claim 6, characterized in that: The outer wall of the sludge sedimentation tank (9) is coated with a thermal insulation layer.

8. The coal mine water waste heat utilization system according to claim 7, characterized in that: An impurity filter screen (11) is arranged at the upper inner part of the sludge settler (9), and the impurity filter screen (11) is located below the top inlet of the sludge settler (9) and above the lower clean water outlet of the sludge settler (9). A detachable cover is arranged at the top of the sludge settler (9).

9. The coal mine water waste heat utilization system according to any one of claims 1 to 8, characterized in that: The sewage pump (4) is located lower than the discharge outlet of the equipment to which the sewage pipe (3) is directly connected.

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