Mine annual heat supply load composite heat source heating system and working method thereof

Abstract

The invention discloses a mine annual heat supply load composite heat source heating system and a working method thereof. The system comprises a heating water tank, a photovoltaic direct current electromagnetic heating subsystem, an air compressor waste heat recovery heating subsystem, a bathing waste water waste heat recovery heating subsystem, a reheating circulation subsystem, a control subsystem and a water supply subsystem. The photovoltaic direct-current electromagnetic heating subsystem, the air compressor waste heat recovery heating subsystem, the bathing waste water waste heat recovery heating subsystem, the reheating circulation subsystem and the water supply subsystem are all connected with the heating water tank and the control module. Light heat storage is fused in a bath waste water waste heat recovery system and an air compressor waste heat recovery system to form an integrated heating and heat supply system, the defects that a hot water solar heat collector is multiple in pipeline, difficult to lay, prone to pipe explosion in winter, frequent in maintenance and the like are overcome, scattered and small amount of waste heat is efficiently utilized, and zero emission and zero pollution are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of HVAC heating, and in particular to a mine year-round heating load composite heat source heating system and a working method thereof. Background Art

[0002] Energy conservation and emission reduction, improving energy utilization efficiency and quality, and achieving sustainable and healthy development are long-term strategic guidelines for my country's economic and social development, and are also an extremely urgent task. Recovering waste heat and reducing energy consumption have important strategic and practical significance for traditional high-energy-consuming and extensive industrial projects to achieve energy conservation and emission reduction and transform development methods. At the same time, strengthening waste heat utilization is also playing an increasingly important role in increasing product output, improving product quality, reducing energy consumption, reducing production costs, and improving working conditions. It has also become an effective means for industrial enterprises to achieve refined management and industrial upgrading. The effectiveness of enterprises in energy conservation and waste heat utilization has also become an important criterion for measuring the quality of enterprise development. At the same time, in response to the national call for carbon peak and carbon neutrality, the implementation of energy conservation, carbon reduction and atmospheric environmental pollution control requirements has further promoted the development of waste heat utilization technology in my country. Many regions have adopted a series of measures to meet standards and restrict development of existing and newly added coal-fired industrial boilers, which indirectly caused the contradiction between the growth of corporate heating demand and the total environmental protection control to become more and more prominent. Waste heat utilization is also an important resource that some enterprises have not yet fully explored. Practice has proved that as long as the use of waste heat is fully considered, enterprises can partially resolve the contradiction between the growth of heating demand and the total environmental protection control, laying a good foundation for the long-term sustainable and healthy development of the enterprise.

[0003] The coal industry is also making every effort to promote the construction of green mines and smart mines, cultivate energy-saving, green and environmentally friendly industries, actively promote the energy efficiency improvement of new infrastructure, and promote efficient heat recovery technology.

[0004] At present, the heat source for centralized heating in mines is mostly large coal-fired boilers. According to environmental protection requirements, the output of a single boiler is more than 35 tons of steam per hour. If there is waste heat from a thermal power plant nearby, long-distance heating can be used. If there is burning gas, gas boilers can be used. Electric boilers can be used if conditions are suitable, but the operating costs are much higher than coal-fired boilers.

[0005] The annual heating load of the mine is mainly the hot water load for bathing, which is crucial for the normal production and life of coal miners and is an essential life guarantee. The annual heat load accounts for about 1 / 4 of the entire season's heat load, which is relatively small. The heating is intermittent and stable and needs to be supplied all year round. In the heating season, high-temperature water or steam provided by large coal-fired boilers or thermal power plants can be used to produce hot water for bathing through heat exchangers; in the non-heating season, the following heating methods can be used.

[0006] (1) The use of small coal-fired boilers will be strictly restricted. The operating load of a large coal-fired boiler is far lower than the national standard requirement of no less than 50%, which is neither energy-saving nor environmentally friendly.

[0007] (2) Thermal power plants use pipelines to transport heat over long distances. Due to the small heat load, not only are the operating costs high, but the thermal power plants are also difficult to provide intermittently.

[0008] (3) Although the use of gas boilers or electric boilers meets the requirements of clean energy, gas boilers are subject to factors such as gas supply, gas supply conditions and the trend of gradually increasing natural gas prices. Most coal mines are located in remote areas and do not have gas conditions. Moreover, the combustion of natural gas will also emit a large amount of carbon dioxide and bring about a greenhouse effect.

[0009] (4) Although air source heat pump heating is a clean energy source, a major disadvantage of air source heat pumps is that their heating capacity and heating performance coefficient decrease as the outdoor temperature decreases. Their use is limited by the ambient temperature, especially in windy and sandy and high-altitude mining areas.

[0010] (5) Develop new heat sources using solar energy. The first is the solar water heating system, which uses solar collectors to heat hot water. The pipeline laying is difficult, and the collectors and pipelines require a lot of maintenance, which affects the heating demand for mine bathing.

[0011] The second is a photovoltaic DC heating system, which uses photovoltaic panels to generate electricity, and transmits unstable (4V-1000V) photovoltaic DC electricity through an electromagnetic heater, and uses the electricity generated by solar energy to directly heat the water in the water tank 1 for bathing and heating. This system is simple to maintain and economical.

[0012] Although solar energy is a free energy source, it is also a low-density energy source. It occupies a large area, and the installation area of ​​the mine site is limited. Moreover, the heating supply is "dependent on the weather", and the energy supply curve is relatively simple.

[0013] (6) The waste heat resources in mines that have high utilization value and match the annual heating load include air compressor waste heat and bathing wastewater waste heat.

[0014] The working process of the air compressor will generate a lot of compression heat. According to statistics, the electricity actually consumed to increase the potential energy of the air accounts for only about 15% of the total power consumption, and about 85% of the electricity is converted into heat. Most of the waste heat can be recovered through the air compressor waste heat recovery device (mainly oil-water heat exchanger) to provide the mine bathing heating load. This is a free heating source, but with the advancement of electrification in mines, the air compressor loading rate is getting smaller and smaller, and the heat provided is far less than the annual heating load.

[0015] Mine bathing wastewater is discharged at a fixed point, and the wastewater temperature is generally around 32°C, which is a very good waste heat resource.

[0016] Since bathing wastewater contains many pollutants such as soap, dandruff, hair, coal slag, dirt, etc., the waste heat is generally recovered using an anti-blocking heat exchanger, and then enters the heat pump, which loses the heat exchange end difference; and the heat exchange efficiency is reduced.

[0017] In view of the shortcomings of the above heating methods and the characteristics of the mine's annual heating load, heating location, fixed time, etc., it is urgent to find an energy-saving, efficient, low-carbon, safe and reliable annual load heating source heating system. Summary of the invention

[0018] The purpose of the present invention is to solve the technical problem of heat source for heating the mine's year-round heating load, and proposes a composite heat source heating system for the year-round heating load, aiming to solve or improve the above-mentioned coal mine's single year-round load heat source selection, poor applicability, complex system, low energy efficiency, high maintenance cost and other problems, overcome the shortcomings of the above-mentioned mine's year-round heat load heating source, and provide an economical, energy-saving, safe and efficient mine year-round heating load composite heat source heating system.

[0019] The present invention follows the scientific energy utilization principle of "energy matching and cascade utilization" and gives priority to utilizing free energy and surplus and waste heat.

[0020] To achieve the above object, the present invention provides the following solutions:

[0021] A composite heat source heating system for the year-round heating load of a mine comprises: a heating water tank, a photovoltaic DC electromagnetic heating subsystem, an air compressor waste heat recovery heating subsystem, a bathing waste water waste heat recovery heating subsystem, a reheat circulation subsystem, a control subsystem and a water supply subsystem; the photovoltaic DC electromagnetic heating subsystem, the air compressor waste heat recovery heating subsystem, the bathing waste water waste heat recovery heating subsystem, the reheat circulation subsystem and the water supply subsystem are all connected to the heating water tank and the control module.

[0022] Preferably, the photovoltaic DC electromagnetic heating subsystem includes a photovoltaic panel, a DC cable, a conversion switch, an inverter, an AC cable and a self-use power storage cabinet; the photovoltaic panel generates electricity through the DC cable and is connected to the electromagnetic heater in the heating water tank via the conversion switch to heat hot water; when the electromagnetic heater stops working, the photovoltaic panel generates electricity through the DC cable and is connected to the inverter via the conversion switch, and is connected to the self-use power storage cabinet via the AC cable.

[0023] Preferably, the air compressor waste heat recovery and heating subsystem includes: an air compressor waste heat recovery unit, a hot water circulation pump and a floating coil heater, wherein the floating coil heater is located in the heating water tank; the water outlet end of the air compressor waste heat recovery unit, the hot water circulation pump, the water inlet of the floating coil heater, the water outlet of the floating coil heater and the water inlet of the air compressor waste heat recovery unit are connected through pipes and accessories to form a heating circulation passage, wherein the accessories include: valves, flexible connections, reducers, elbows, pressure gauges and thermometers.

[0024] Preferably, the bathing wastewater waste heat recovery and heating subsystem comprises: a water collection tank, a submersible sewage pump, a backwashing filter device, an original ecological water source heat pump unit and a circulating hot water pump;

[0025] The water collection tank, the submersible sewage pump, the backwash filter device, and the original ecological water source heat pump unit are connected through pipelines and accessories to form a heat exchange circulation path;

[0026] The condenser water outlet of the original ecological heat pump unit, the circulating hot water pump, the water inlet of the heating water tank, the water outlet of the heating water tank and the condenser water inlet of the original ecological heat pump unit are connected through pipes and the accessories to form another heat exchange circulation path.

[0027] Preferably, bathing wastewater flows through the collection tank, and the filtered and precipitated wastewater is sent to the backwash filter device by the submersible sewage pump, and then enters the evaporator water inlet end of the original ecological heat pump unit. The wastewater is heat exchanged through the evaporator and sent back to the collection tank from the evaporator water outlet end of the original ecological heat pump.

[0028] Preferably, the reheat circulation subsystem is connected to the water supply subsystem via a temperature control valve;

[0029] The reheat cycle subsystem includes: an insulation water tank, an M1 electric valve and an M2 electric valve;

[0030] The water supply subsystem includes: an M3 solenoid valve and a hot water supply pump.

[0031] Preferably, when the water temperature of the insulated water tank is lower than a preset temperature value, the water outlet of the insulated water tank, the hot water supply pump, the M2 electric valve 22, the water inlet of the heating water tank, the water outlet of the heating water tank, the temperature control valve and the water inlet of the insulated water tank are connected by pipes and the accessories to form a hot water reheating path; at this time, the M1 electric valve 21 and the M3 solenoid valve must be closed at the same time, and the M2 electric valve must be opened;

[0032] When the water supply subsystem is supplying hot water, the tap water inlet, the M3 solenoid valve, the water inlet of the heating water tank, the water outlet of the heating water tank, the temperature control valve, the water inlet of the insulation water tank, the water outlet of the insulation water tank, the hot water supply pump and the M1 electric valve are connected by pipes and the accessories to form a hot water passage. At this time, the M2 electric valve must be closed.

[0033] Preferably, the control subsystem includes: a T1 temperature sensor, a T2 temperature sensor, a T3 temperature sensor, a liquid level sensor and an automatic control device.

[0034] The present invention also provides a working method of a mine year-round heating load composite heat source heating system, the working method is applied to the above system,

[0035] When the T1 temperature sensor measures that the water temperature of the heating water tank has not reached the preset temperature, the photovoltaic DC electromagnetic heating subsystem and the air compressor waste heat recovery heating subsystem are preferentially turned on through the automatic control device, and then the bathing waste water waste heat recovery heating subsystem is turned on;

[0036] When the water temperature in the heating water tank reaches the preset temperature, the temperature control valve opens and the hot water enters the thermal insulation water tank for storage;

[0037] When the water temperature of the thermal insulation water tank measured by the T2 temperature sensor is lower than the preset temperature, the reheat circulation subsystem is turned on through the automatic control device;

[0038] The water supply pump of the water supply system is also controlled by the liquid level sensor. When the water level of the thermal insulation water tank reaches a preset height, the water supply pump is forced to stop through the automatic control device.

[0039] When the T3 temperature sensor measures that the return water temperature of the bathing wastewater of the original ecological heat pump unit is lower than a preset value, the bathing wastewater waste heat recovery and heating subsystem is shut down through the automatic control device.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. Integrate solar heat storage into the two recovery systems of waste heat from bathing wastewater and waste heat from air compressor to form an integrated heating and heat supply system. This overcomes the shortcomings of hot water solar collectors, such as many pipes, difficult laying, pipe bursts in winter, and frequent maintenance. It makes efficient use of dispersed and small amounts of waste heat to achieve zero emissions and zero pollution.

[0042] 2. A composite heat source heating system is used, which is flexible, safe and reliable, and accurately utilizes the characteristics of waste heat from coal mines, overcoming the shortcomings of small heating load and intermittent heat use throughout the year. Compared with other heating modes (such as air source heat pumps, gas boilers, and coal-fired boilers), the annual reduction in carbon emissions has reached the domestic advanced level.

[0043] 3. The mine's annual heating load composite heat source heating system automatically adjusts the operating state according to the heat demand to achieve optimal energy saving. Through intelligent control, the system achieves high reliability, high safety, low cost and unattended mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0045] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0046] Explanation of the reference numerals: 1. Heating water tank; 2. Insulated water tank; 3. Photovoltaic panel; 4. Inverter; 5. Self-use power storage cabinet; 6. Electromagnetic heater; 7. Air compressor waste heat recovery unit; 8. Hot water circulation pump; 9. Floating coil heater; 10. Original ecological heat pump unit; 11. Collection tank; 12. Submersible sewage pump; 13. Backwash filter device; 14. Circulation pump; 15. Automatic control device; 16. Conversion switch; 17. DC cable; 18. AC cable; 19. Hot water supply pump; 20. Temperature control valve; 21. M1 electric valve; 22. M2 electric valve; 23. M3 solenoid valve; 24. T1 temperature sensor; 25. T2 temperature sensor; 26. T3 temperature sensor; 27. Liquid level sensor. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Embodiment 1

[0050] like Figure 1As shown, it is a schematic diagram of the system structure of the present invention, including: a heating water tank 1, a photovoltaic DC electromagnetic heating subsystem, an air compressor waste heat recovery heating subsystem, a bathing waste water waste heat recovery heating subsystem, a reheat circulation subsystem, a control subsystem and a water supply subsystem; the photovoltaic DC electromagnetic heating subsystem, the air compressor waste heat recovery heating subsystem, the bathing waste water waste heat recovery heating subsystem, the reheat circulation subsystem and the water supply subsystem are all connected to the heating water tank 1 and the control module.

[0051] The photovoltaic DC electromagnetic heating subsystem includes a photovoltaic panel 3, a DC cable 17, a conversion switch 16, an inverter 4, an AC cable 18 and a self-use power storage cabinet 5; the photovoltaic panel 3 generates electricity and is connected to the electromagnetic heater 6 in the heating water tank 1 through the DC cable 17 via the conversion switch 16 to heat the hot water; when the electromagnetic heater 6 stops working, the photovoltaic panel 3 generates electricity and is connected to the inverter 4 through the DC cable 17 via the conversion switch 16, and is connected to the self-use power storage cabinet 5 via the AC cable 18.

[0052] The air compressor waste heat recovery and heating subsystem includes: an air compressor waste heat recovery unit 7, a hot water circulation pump 8 and a floating coil heater 9, and the floating coil heater 9 is located in the heating water tank 1; the water outlet of the air compressor waste heat recovery unit 7, the hot water circulation pump 8, the water inlet of the floating coil heater 9, the water outlet of the floating coil heater 9 and the water inlet of the air compressor waste heat recovery unit 7 are connected through pipes and accessories to form a heating circulation passage, wherein the accessories include: valves, flexible connections, reducers, elbows, pressure gauges, and thermometers.

[0053] The bathing wastewater waste heat recovery heating subsystem includes two heat exchange loops:

[0054] The water collection tank 11, the submersible sewage pump 12, the backwash filter device 13, and the inlet and outlet interfaces of the original ecological water source heat pump unit 10 (evaporator) are connected through pipes and accessories to form a heat exchange circulation path;

[0055] The water inlet and outlet ends of the original ecological heat pump unit 10 (condenser), the circulating hot water pump 14, and the water inlet and outlet of the heating water tank 1 are connected through pipes and accessories to form another heat exchange circulation path.

[0056] That is, the bathing wastewater flows through the water collection tank 11, and the filtered and precipitated wastewater is sent to the backwash filter device 13 by the submersible sewage pump 12, and then enters the evaporator water inlet end of the original ecological heat pump unit 10. After the wastewater exchanges heat with the working fluid of the unit through the evaporator, it is sent back to the water collection tank 11 from the evaporator water outlet end of the original ecological heat pump.

[0057] The low-temperature water in the heating water tank 1 circulates to the original ecological heat pump unit 10, and after heat exchange with the unit working fluid through the condenser, it is sent to the heating water tank 1 by the circulating hot water pump 14.

[0058] The reheat circulation subsystem is connected to the water supply subsystem by a temperature control valve 20; the reheat circulation subsystem includes: an insulated water tank 2, an M1 electric valve and an M2 electric valve; the water supply subsystem includes: an M3 solenoid valve 23 and a hot water supply pump 19.

[0059] When the water temperature of the insulated water tank 2 is lower than the preset temperature value, the water outlet of the insulated water tank 2, the hot water supply pump 19, the M2 electric valve 22, the water inlet of the heating water tank 1, the water outlet of the heating water tank 1, the temperature control valve 20 and the water inlet of the insulated water tank 2 are connected by pipes and accessories to form a hot water reheating path; at this time, the M1 electric valve 21 and the M3 electromagnetic valve 23 must be closed at the same time, and the M2 electric valve must be opened;

[0060] When the water supply subsystem is supplying hot water, the tap water inlet, M3 solenoid valve 23, the water inlet of the heating water tank 1, the water outlet of the heating water tank 1, the temperature control valve 20, the water inlet of the insulation water tank 2, the water outlet of the insulation water tank 2, the hot water supply pump 19 and the M1 electric valve are connected by pipes and accessories to form a hot water passage. At this time, the M2 electric valve must be closed.

[0061] The control subsystem includes: T1 temperature sensor, T2 temperature sensor 25, T3 temperature sensor 26, liquid level sensor 27 and automatic control device 15. The method of the control subsystem controlling the composite heat source heating system of the overall mine heating load throughout the year specifically includes:

[0062] When the temperature sensor T1 detects that the water temperature of the heating water tank 1 has not reached the preset temperature, the photovoltaic DC electromagnetic heating subsystem and the air compressor waste heat recovery heating subsystem are preferentially turned on through the automatic control device 15, and then the bathing waste water waste heat recovery heating subsystem is turned on;

[0063] When the water temperature in the heating water tank 1 reaches the preset temperature, the temperature control valve 20 is turned on, and the hot water enters the insulation water tank 2 for storage;

[0064] When the T2 temperature sensor 25 measures that the water temperature of the thermal insulation water tank 2 is lower than the preset temperature, the reheat circulation subsystem is turned on through the automatic control device 15;

[0065] The water supply pump of the water supply system is also controlled by the liquid level sensor 27. When the water level of the insulated water tank 2 reaches a preset height, the water supply pump is forced to stop through the automatic control device 15;

[0066] When the T3 temperature sensor 26 measures that the return water temperature of the bathing wastewater of the original ecological heat pump unit 10 is lower than the preset value, the bathing wastewater waste heat recovery and heating subsystem is shut down through the automatic control device 15.

[0067] Embodiment 2

[0068] The working method of the composite heat source heating system for the annual heating load of a mine according to the present invention will be described in detail below in conjunction with this embodiment:

[0069] First, prioritize and maximize the use of free energy heating systems.

[0070] The photovoltaic DC electromagnetic heating subsystem uses the photovoltaic panel 3 to generate electricity, and uses electromagnetic heating technology to directly send the unstable (4V-200V) photovoltaic DC power generated by solar energy to the electromagnetic heater 6 through the DC cable 17 to heat the water. When the water temperature in the heating water tank 1 reaches the set value (60℃), the system automatically disconnects the DC power, and the photovoltaic DC power is stored in the energy storage cabinet through the inverter 4 for self-use.

[0071] The use of photovoltaics is limited by time (daytime, nighttime) and weather (cloudy, rainy, snowy), and photovoltaics are a low-density energy source (the average annual power generation is about 130kWh / m 2 ), the space available for installing photovoltaic panels 3 in coal mines is limited, and they are only used as auxiliary heating heat sources.

[0072] The air compressor waste heat recovery heating system installs a waste heat recovery unit (mainly oil-water heat exchanger) next to the air compressor to transfer the waste heat of the air compressor to the closed primary side circulating water. The circulating water inlet / return temperature is 70 / 60℃. The primary side circulating water passes through the hot water circulation pump 8 and is sent to the floating coil of the heating water tank 1 through the delivery pipeline to heat the hot water in the water tank 1. The air compressor waste heat recovery system is connected in parallel with the original air compressor air cooling system and can be switched between them.

[0073] Secondly, the waste heat of the bathing wastewater provided by the coal mine joint building with high waste heat value is used to directly heat the water in the water tank 1 through the original ecological heat pump unit 10.

[0074] The waste heat recovery system for bathing wastewater sends the (32℃-35℃) wastewater to the heat pump room through the submersible sewage pump 12 in the water collection tank 11, and enters the evaporator of the original ecological heat pump unit 10 through the filtering device, and then sends it to the water collection tank 11 after taking heat. The water in the heating water tank 1 is sent to the condenser of the original ecological heat pump unit 10 through the circulating pump 14 to produce hot water with a temperature of 60℃.

[0075] Tap water enters the heating water tank 1 through the control valve. When the water temperature is heated to the set temperature (55°C), the temperature control valve 20 opens, and the hot water flows to the insulation water tank 2, and then is sent to the bathing center of the coal mine joint building through the hot water supply pump 19.

[0076] The working process of the T1 temperature sensor 24 in the heating water tank 1 and the automatic control device 15 is as follows:

[0077] First, turn on the photovoltaic DC electromagnetic heating subsystem and the air compressor waste heat recovery subsystem. When the water temperature in the water tank reaches the set value, the electromagnetic cooker heater is automatically disconnected and switched to the energy storage state. Second, the air compressor circulating hot water pump stops, and the waste heat recovery system switches to the original air cooling system.

[0078] Secondly, the original ecological heat pump heating system is turned on to directly heat the hot water in the water tank 1. When the temperature of the evaporation wastewater of the original ecological heat pump unit 10 reaches the set value, the temperature sensor turns off the heat pump unit through the control device, and then turns off the submersible sewage pump 12 and the hot water circulation pump 8.

[0079] The temperature sensor in the insulated water tank 2 ensures that the hot water provided by the hot water supply pump 19 is at a temperature that meets the bathing requirements through the control device. When the water temperature in the insulated water tank 2 is lower than the set value, the solenoid valve on the tap water pipeline and the M1 electric valve 21 on the hot water supply pipeline are closed, the M2 electric valve 22 on the bypass loop is opened, and the hot water supply pump 19 is turned on to perform a reheating cycle.

[0080] The liquid level sensor 27 in the insulated water tank 2 controls the hot water supply pump 19 to stop the pump through the control device according to the set liquid level value.

[0081] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A composite heat source heating system for mine heating load throughout the year, characterized in that: include: A heating water tank, a photovoltaic DC electromagnetic heating subsystem, an air compressor waste heat recovery heating subsystem, a bathing waste water waste heat recovery heating subsystem, a reheat circulation subsystem, a control subsystem and a water supply subsystem; the photovoltaic DC electromagnetic heating subsystem, the air compressor waste heat recovery heating subsystem, the bathing waste water waste heat recovery heating subsystem, the reheat circulation subsystem and the water supply subsystem are all connected to the heating water tank and the control module.

2. The composite heat source heating system for the mine's annual heating load according to claim 1 is characterized in that: The photovoltaic DC electromagnetic heating subsystem includes a photovoltaic panel, a DC cable, a conversion switch, an inverter, an AC cable and a self-use power storage cabinet; the photovoltaic panel generates electricity and is connected to the electromagnetic heater in the heating water tank through the DC cable via the conversion switch to heat hot water; when the electromagnetic heater stops working, the photovoltaic panel generates electricity and is connected to the inverter through the DC cable via the conversion switch, and then to the self-use power storage cabinet via the AC cable.

3. The composite heat source heating system for mine heating load throughout the year according to claim 1 is characterized in that: The air compressor waste heat recovery and heating subsystem includes: an air compressor waste heat recovery unit, a hot water circulation pump and a floating coil heater, wherein the floating coil heater is located in the heating water tank; the water outlet end of the air compressor waste heat recovery unit, the hot water circulation pump, the water inlet of the floating coil heater, the water outlet of the floating coil heater and the water inlet of the air compressor waste heat recovery unit are connected through pipes and accessories to form a heating circulation passage, wherein the accessories include: valves, flexible connections, reducers, elbows, pressure gauges and thermometers.

4. The composite heat source heating system for the mine's annual heating load according to claim 3 is characterized in that: The bathing wastewater waste heat recovery and heating subsystem includes: a water collection tank, a submersible sewage pump, a backwash filter device, an original ecological water source heat pump unit and a circulating hot water pump; The water collection tank, the submersible sewage pump, the backwash filter device, and the original ecological water source heat pump unit are connected through pipelines and accessories to form a heat exchange circulation path; The condenser water outlet of the original ecological heat pump unit, the circulating hot water pump, the water inlet of the heating water tank, the water outlet of the heating water tank and the condenser water inlet of the original ecological heat pump unit are connected through pipes and the accessories to form another heat exchange circulation path.

5. The composite heat source heating system for the mine's annual heating load according to claim 4 is characterized in that: Bathing wastewater flows through the water collection tank, and the filtered and precipitated wastewater is sent to the backwash filter device by the submersible sewage pump, and then enters the evaporator water inlet end of the original ecological heat pump unit. The wastewater is heat exchanged through the evaporator and sent back to the water collection tank from the evaporator water outlet end of the original ecological heat pump.

6. The mine annual heating load composite heat source heating system according to claim 3 is characterized in that: The reheat circulation subsystem is connected to the water supply subsystem by a temperature control valve; The reheat cycle subsystem includes: an insulation water tank, an M1 electric valve and an M2 electric valve; The water supply subsystem includes: an M3 solenoid valve and a hot water supply pump.

7. The composite heat source heating system for the mine's annual heating load according to claim 6 is characterized in that: When the water temperature of the insulated water tank is lower than the preset temperature value, the water outlet of the insulated water tank, the hot water supply pump, the M2 electric valve 22, the water inlet of the heating water tank, the water outlet of the heating water tank, the temperature control valve and the water inlet of the insulated water tank are connected by pipes and accessories to form a hot water reheating path; at this time, the M1 electric valve 21 and the M3 solenoid valve must be closed at the same time, and the M2 electric valve must be opened; When the water supply subsystem is supplying hot water, the tap water inlet, the M3 solenoid valve, the water inlet of the heating water tank, the water outlet of the heating water tank, the temperature control valve, the water inlet of the insulation water tank, the water outlet of the insulation water tank, the hot water supply pump and the M1 electric valve are connected by pipes and the accessories to form a hot water passage. At this time, the M2 electric valve must be closed.

8. The composite heat source heating system for the mine's annual heating load according to claim 1 is characterized in that: The control subsystem includes: a T1 temperature sensor, a T2 temperature sensor, a T3 temperature sensor, a liquid level sensor and an automatic control device.

9. A working method of a composite heat source heating system for a mine's annual heating load, the working method being applied to the system according to any one of claims 1 to 8, characterized in that: When the T1 temperature sensor measures that the water temperature of the heating water tank has not reached the preset temperature, the photovoltaic DC electromagnetic heating subsystem and the air compressor waste heat recovery heating subsystem are preferentially turned on through the automatic control device, and then the bathing waste water waste heat recovery heating subsystem is turned on; When the water temperature in the heating water tank reaches the preset temperature, the temperature control valve opens and the hot water enters the thermal insulation water tank for storage; When the water temperature of the thermal insulation water tank measured by the T2 temperature sensor is lower than the preset temperature, the reheat circulation subsystem is turned on through the automatic control device; The water supply pump of the water supply system is also controlled by the liquid level sensor. When the water level of the thermal insulation water tank reaches a preset height, the water supply pump is forced to stop through the automatic control device. When the T3 temperature sensor measures that the return water temperature of the bathing wastewater of the original ecological heat pump unit is lower than a preset value, the bathing wastewater waste heat recovery and heating subsystem is shut down through the automatic control device.

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