Low-carbon mine cold and heat energy comprehensive utilization system

Abstract

The application discloses a low-carbon mine cold and heat energy comprehensive utilization system, which comprises a gas-water heat exchanger, three electric compression heat pumps, an electric ice maker, an ice storage tank, a normal-temperature surface cooler, a low-temperature surface cooler and an ultralow-temperature surface cooler, wherein outdoor air pipe networks are connected with the normal-temperature surface cooler, the low-temperature surface cooler and the ultralow-temperature surface cooler respectively, the normal-temperature surface cooler, the low-temperature surface cooler and the ultralow-temperature surface cooler are connected in sequence and are connected into a ventilation shaft, mine fresh air is connected with a return air shaft after being heated by a mine ventilation system after entering the ventilation shaft, return air of the return air shaft is discharged into the atmosphere or is discharged into the gas side of the gas-water heat exchanger to release heat, and the ice storage tank is connected with the electric ice maker and the ultralow-temperature surface cooler through pipelines to form a loop. According to the different characteristics of air temperature in different periods under the natural environment, the natural cold source is fully utilized for underground cooling and ice making and storage, and the operation power consumption is saved; the mine return air waste heat is recycled for mine auxiliary heating and shaft air anti-freezing preheating.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of heating, ventilation and air conditioning, and particularly relates to a low-carbon mine cold and heat energy comprehensive utilization system. BACKGROUND

[0002] In recent years, the industrialization process in China is accelerating, and the development of industry depends on mineral resources to a large extent, and the mining depth is increasing. At the same time, the high temperature and high humidity problem of the air environment in the deep mine is becoming more and more serious, and a series of problems caused thereby are more and more prominent, such as harm to the body of workers (heat stroke, nervous diseases, etc.), decline in production efficiency, increase in accident rate, shortening of the service life of mechanical equipment, etc., which seriously restrict the development efficiency of mineral resources and the health protection of mine workers. At present, mine heat damage has become one of the six disasters threatening the safety production of coal mines;

[0003] Therefore, attention should be paid to the research and development of mine heat damage environment control technology; the current mine air cooling heat pump system often relies on a large amount of other energy (such as natural gas, waste gas, exhaust air and waste heat, etc.) to provide energy for the heat pump, but it is difficult to obtain, the utilization cost is high, and the applicable range is small, the underground air heat exchange is not flexible enough, and it is difficult to meet the low-carbon operation demand in all year working conditions. SUMMARY

[0004] In view of the characteristics of large air temperature difference in China all year round, the application provides a low-carbon mine cold and heat energy comprehensive utilization system, characterized in that it comprises: primary network water supply, primary network water return, secondary network water supply, secondary network water return, tertiary network water supply, tertiary network water return, air-water heat exchanger, cooling tower, electric compression heat pump one, electric compression heat pump two, electric compression heat pump three, electric ice maker, ice storage tank, normal temperature surface cooler, low temperature surface cooler and ultralow temperature surface cooler, wherein the outdoor air pipe network is connected with the normal temperature surface cooler, the low temperature surface cooler and the ultralow temperature surface cooler, the normal temperature surface cooler, the low temperature surface cooler and the ultralow temperature surface cooler are connected in sequence and introduced into the ventilation shaft; the mine fresh air is connected with the return air shaft after being heated by the mine underground ventilation system after entering the ventilation shaft, and the return air of the return air shaft is introduced into the air side of the air-water heat exchanger to release heat or directly discharged into the atmosphere; the ice storage tank is connected with the electric ice maker and the ultralow temperature surface cooler through the pipeline to form a loop;

[0005] The primary network return water sequentially passes through the thirteenth valve, the sixteenth three-way valve, the fifteenth valve, the first three-way valve, the non-secondary water inlet / outlet of the electric compression heat pump one, the circulating water pump, the second three-way valve, the sixteenth valve, the third three-way valve, the non-secondary water inlet / outlet of the electric compression heat pump two, the circulating water pump, the fourth three-way valve, the seventeenth valve, the condenser side of the electric compression heat pump three, the eighteenth valve, the fifteenth three-way valve, and the fourteenth valve, and is connected to the primary network water supply. The third path of the fifteenth three-way valve passes through the second first valve, the seventeenth three-way valve, the water side of the ambient temperature surface cooler, the eighteenth three-way valve, the second second valve, and is connected to the third path of the sixteenth three-way valve. The third path of the seventeenth three-way valve passes through the second valve and is connected to the third path of the second three-way valve. The third path of the eighteenth three-way valve passes through the first valve and is connected to the third path of the first three-way valve. The third path of the fourth three-way valve passes through the third valve, the water side of the low temperature surface cooler, the fourth valve, and the third path of the third three-way valve.

[0006] The secondary network return water enters the evaporator side of the electric compression heat pump three through valves six, thirteen, eight, and twelfth respectively. Then, the evaporator-side outlet of the electric compression heat pump three sequentially passes through valve eleven, seven, nine, and five to serve as secondary network supply water. This secondary network supply water returns to the water side of the gas-water heat exchanger through valve eleven and eight. The third path of valve five is connected to the third path of valve six via valve five, cooling tower, valve six, and circulating water pump. The fourth path of valve eight... The three channels sequentially connect to the third channel of the seventh three-way valve via the third two valve, the secondary water inlet and outlet of the electric compression heat pump one, and the third one valve; the third channel of the thirteenth channel connects to the third channel of the ninth three-way valve via the secondary water inlet and outlet of the electric compression heat pump two; the third channel of the eleventh three-way valve connects to the third channel of the twelfth three-way valve via the tenth valve, the electric ice maker, and the ninth valve; the water flowing out of the water side of the gas-water heat exchanger passes through the seventh valve, the twelfth three-way valve, and the circulating water pump, and then merges with the water flowing out of the electric ice maker to form the secondary network return water.

[0007] When the ambient temperature is >26℃, all three electric compression heat pumps (first, second, and third) and the ice storage tank are turned on. The secondary water inlet and outlet of electric compression heat pump first are connected to the inlet and outlet on the condenser side of electric compression heat pump first. The inlet and outlet on the evaporator side of electric compression heat pump first are connected to the inlet and outlet on the water side of the ambient temperature surface cooler through the non-secondary water inlet and outlet of electric compression heat pump first. The secondary water inlet and outlet of electric compression heat pump second are connected to the inlet and outlet on the condenser side of electric compression heat pump second. The inlet and outlet on the evaporator side of electric compression heat pump second are connected to the inlet and outlet on the water side of the low temperature surface cooler through the non-secondary water inlet and outlet of electric compression heat pump second. Outdoor air first enters the gas side of the ambient temperature surface cooler for cooling, then enters the gas side of the low temperature surface cooler for secondary cooling, then enters the gas side of the ultra-low temperature surface cooler for a third cooling, and finally is sent into the mine intake air shaft. After heat and humidity treatment of the underground air, it is discharged into the atmosphere from the mine return air shaft.

[0008] When the ambient temperature is between 15℃ and 26℃, the electric compression heat pump II is turned on. The secondary water inlet and outlet of the electric compression heat pump II are connected to the inlet and outlet on the condenser side of the electric compression heat pump II. The inlet and outlet on the evaporator side of the electric compression heat pump II are connected to the inlet and outlet on the water side of the low-temperature surface cooler through the non-secondary water inlet and outlet of the electric compression heat pump II. Outdoor air directly enters the gas side of the low-temperature surface cooler for cooling, then enters the ultra-low temperature surface cooler for secondary cooling, and finally is sent into the mine intake air shaft. After the underground air is treated with heat and humidity, it is discharged into the atmosphere through the return air shaft. The condenser side of the electric compression heat pump II is cooled by heat exchange through the cooling tower, and the water side of the ultra-low temperature surface cooler is cooled by heat exchange with the ice storage tank.

[0009] When the ambient temperature is 5℃~15℃, the ultra-low temperature surface cooler is turned on, and outdoor air directly enters the gas side of the ultra-low temperature surface cooler for cooling. It is then sent into the mine intake air shaft, where the underground air undergoes heat and humidity treatment. After that, it is sent from the return air shaft into the gas-water heat exchanger for return air cooling. The ultra-low temperature surface cooler exchanges heat with the ice storage tank.

[0010] When the ambient temperature is 2℃~5℃, the primary network return water is sequentially heated by electric compression heat pump one, electric compression heat pump two, and electric compression heat pump three before being supplied to the primary network. The secondary water inlet and outlet of electric compression heat pump one are connected to the inlet and outlet on the evaporator side of electric compression heat pump one, and the secondary water inlet and outlet of electric compression heat pump two are connected to the inlet and outlet on the evaporator side of electric compression heat pump two. The inlet and outlet on the condenser side of electric compression heat pump two are connected to the non-secondary water inlet and outlet of electric compression heat pump two, and the inlet and outlet on the condenser side of electric compression heat pump one are connected to the non-secondary water inlet and outlet of electric compression heat pump one. The secondary water inlet and outlet are connected; outdoor air is directly sent into the mine's intake air shaft, where it undergoes heat and humidity treatment before entering the gas-water heat exchanger from the return air shaft for waste heat recovery; the secondary water supply, which is drawn from the outlets of electric compression heat pump one, electric compression heat pump two, and electric compression heat pump three, simultaneously enters the water side of the gas-water heat exchanger and the electric ice maker to absorb heat and increase its temperature; the return air from the return air shaft enters the gas side of the gas-water heat exchanger to release heat; and the ice made by the electric ice maker is stored in the ice storage tank; after being heated, the secondary return water is drawn together and then enters the electric compression heat pump one, electric compression heat pump two, and electric compression heat pump three to release heat.

[0011] When the ambient temperature is <2℃, the primary network return water is sequentially heated by electric compression heat pump one, electric compression heat pump two, and electric compression heat pump three before being supplied to the primary network. The secondary water inlet and outlet of electric compression heat pump one are connected to the inlet and outlet on the evaporator side of electric compression heat pump two, and the secondary water inlet and outlet of electric compression heat pump two are connected to the inlet and outlet on the evaporator side of electric compression heat pump two. The condenser side inlet and outlet of electric compression heat pump two are connected to the non-secondary water inlet and outlet of electric compression heat pump two, and the condenser side inlet and outlet of electric compression heat pump one are connected to the non-secondary water inlet and outlet of electric compression heat pump one. Outdoor air first enters the gas side of the ambient temperature surface cooler for preheating. The air is then fed into the mine's intake air shaft, where it undergoes heat and humidity treatment. From there, it enters the gas-water heat exchanger through the return air shaft for waste heat recovery. The water side of the ambient temperature surface cooler is directly separated from the primary network's water supply for heat exchange and flows back to the primary network's return water pipeline. Secondary water supplied from the outlets of electric compression heat pumps one, two, and three simultaneously enters the water side of the gas-water heat exchanger and the electric ice maker to absorb heat and increase temperature. Return air from the return air shaft enters the gas side of the gas-water heat exchanger to release heat, and the ice produced by the electric ice maker is stored in an ice storage tank. After heating, the secondary return water merges and enters electric compression heat pumps one, two, and three to release heat.

[0012] A thirteenth ...

[0013] When the heat of the primary water supply is excessive, the primary water supply enters the upper part of the hot water storage tank through the 20th valve in the third channel of the 14th three-way valve. At the same time, as the high-temperature water enters from the upper part, the low-temperature water in the lower part of the hot water storage tank flows out through the 19th valve and mixes with the primary water return.

[0014] When the heat supply from the primary network is insufficient, the return water from the primary network enters the lower part of the hot water storage tank through the 19th valve in the third channel of the 13th three-way valve. At the same time, as the low-temperature water enters from the lower part, the high-temperature water in the upper part of the hot water storage tank flows out through the 20th valve and mixes with the water supplied from the primary network.

[0015] This invention also provides a low-carbon mine thermal energy comprehensive utilization system, comprising: a primary network water supply, a primary network return, a secondary network water supply, a secondary network return, a tertiary network water supply, a tertiary network return, a gas-water heat exchanger, a cooling tower, an electric compression heat pump I, an electric compression heat pump II, an electric compression heat pump III, an electric ice maker, an ice storage tank, a normal temperature surface cooler, a low temperature surface cooler, and an ultra-low temperature surface cooler. The outdoor air duct network is connected to the normal temperature surface cooler, the low temperature surface cooler, and the ultra-low temperature surface cooler, respectively. The normal temperature surface cooler, the low temperature surface cooler, and the ultra-low temperature surface cooler are sequentially connected and connected to the ventilation shaft. Mine fresh air enters the ventilation shaft, absorbs heat through the mine's underground ventilation system, and is then connected to the return air shaft. The return air from the return air shaft enters the gas side of the gas-water heat exchanger for heat release or is directly discharged into the atmosphere. The ice storage tank is connected to the electric ice maker and the ultra-low temperature surface cooler via pipelines to form a loop.

[0016] The primary return water sequentially passes through valve 13, tee 16, and tee 13 before entering tee 19 and splitting into two paths. One path sequentially passes through valve 15, tee 1, the non-secondary water inlet / outlet of electric compression heat pump 1, the circulating water pump, tee 2, valve 16, tee 3, the non-secondary water inlet / outlet of electric compression heat pump 2, the circulating water pump, tee 4, and valve 2, tee 3, connecting to tee 23. The other path passes through valve 17, the condenser side of electric compression heat pump 3, valve 18, and connects to tee 23. Both paths are connected at tee 23. After converging, the water flows sequentially through the 15th three-way valve, the 14th three-way valve, and the 14th valve to connect with the primary water supply network; the third path of the 15th three-way valve connects through the 21st valve, the 17th three-way valve, the water side of the ambient temperature surface cooler, the 18th three-way valve, and the 22nd valve to the third path of the 16th three-way valve; the third path of the 17th three-way valve connects through the 2nd valve to the third path of the 23rd three-way valve; the third path of the 18th three-way valve connects through the 1st valve to the third path of the 13rd three-way valve; the third path of the 4th three-way valve connects through the 3rd valve, the water side of the low temperature surface cooler, the 4th valve, and the third path of the 33rd three-way valve.

[0017] The secondary network return water enters the evaporator side of the electric compression heat pump three through valves six, thirteen, eight, and twelfth respectively. Then, the evaporator-side outlet of the electric compression heat pump three sequentially passes through valve eleven, seven, nine, and five to serve as secondary network supply water. This secondary network supply water returns to the water side of the gas-water heat exchanger through valve eleven and eight. The third path of valve five is connected to the third path of valve six via valve five, cooling tower, valve six, and circulating water pump. The fourth path of valve eight... The three channels sequentially connect to the third channel of the seventh three-way valve via the third and second valves, the secondary water inlet and outlet of the electric compression heat pump one, and the third valve; the third channel of the thirteenth channel connects to the third channel of the ninth three-way valve via the secondary water inlet and outlet of the electric compression heat pump two; the third channel of the eleventh three-way valve connects to the third channel of the twelfth three-way valve via the tenth valve, the electric ice maker, and the ninth valve; the water flowing out from the water side of the gas-water heat exchanger passes through the seventh valve, the twelfth three-way valve, and the circulating water pump, and then merges with the water flowing out from the electric ice maker to form the secondary network return water.

[0018] When the ambient temperature is >26℃, all three electric compression heat pumps (first, second, and third) and the ice storage tank are turned on. The secondary water inlet and outlet of electric compression heat pump first are connected to the inlet and outlet on the condenser side of electric compression heat pump first. The inlet and outlet on the evaporator side of electric compression heat pump first are connected to the inlet and outlet on the water side of the ambient temperature surface cooler through the non-secondary water inlet and outlet of electric compression heat pump first. The secondary water inlet and outlet of electric compression heat pump second are connected to the inlet and outlet on the condenser side of electric compression heat pump second. The inlet and outlet on the evaporator side of electric compression heat pump second are connected to the inlet and outlet on the water side of the low temperature surface cooler through the non-secondary water inlet and outlet of electric compression heat pump second. Outdoor air first enters the gas side of the ambient temperature surface cooler for cooling, then enters the gas side of the low temperature surface cooler for secondary cooling, then enters the gas side of the ultra-low temperature surface cooler for a third cooling, and finally is sent into the mine intake air shaft. After heat and humidity treatment of the underground air, it is discharged into the atmosphere from the mine return air shaft.

[0019] When the ambient temperature is between 15℃ and 26℃, the electric compression heat pump II is turned on. The secondary water inlet and outlet of the electric compression heat pump II are connected to the inlet and outlet on the condenser side of the electric compression heat pump II. The inlet and outlet on the evaporator side of the electric compression heat pump II are connected to the inlet and outlet on the water side of the low-temperature surface cooler through the non-secondary water inlet and outlet of the electric compression heat pump II. Outdoor air directly enters the gas side of the low-temperature surface cooler for cooling, then enters the ultra-low temperature surface cooler for secondary cooling, and finally is sent into the mine intake air shaft. After the underground air is treated with heat and humidity, it is discharged into the atmosphere through the return air shaft. The condenser side of the electric compression heat pump II is cooled by heat exchange through the cooling tower, and the water side of the ultra-low temperature surface cooler is cooled by heat exchange with the ice storage tank.

[0020] When the ambient temperature is 5℃~15℃, the ultra-low temperature surface cooler is turned on, and outdoor air directly enters the gas side of the ultra-low temperature surface cooler for cooling and is sent into the mine intake air shaft. After the underground air is treated with heat and humidity, it is discharged into the atmosphere from the return air shaft. The ultra-low temperature surface cooler exchanges heat with the ice storage tank.

[0021] When the ambient temperature is 2℃~5℃, the primary network return water is divided into two paths. One path is heated sequentially by electric compression heat pump one and electric compression heat pump two, while the other path is heated by electric compression heat pump three. After the two paths are combined, they supply water to the primary network. The secondary water inlet and outlet of electric compression heat pump one are connected to the inlet and outlet on the evaporator side of electric compression heat pump one, and the secondary water inlet and outlet of electric compression heat pump two are connected to the inlet and outlet on the evaporator side of electric compression heat pump two. The inlet and outlet on the condenser side of electric compression heat pump two are connected to the non-secondary water inlet and outlet of electric compression heat pump two, and the inlet and outlet on the condenser side of electric compression heat pump one are connected to... The non-secondary water inlet and outlet of electric compression heat pump one are connected; outdoor air is directly sent into the mine intake air shaft, and after the underground air is treated with heat and humidity, it enters the gas-water heat exchanger from the return air shaft for return air waste heat recovery; the secondary water supplied by the outlets of electric compression heat pump one, electric compression heat pump two and electric compression heat pump three enters the water side of the gas-water heat exchanger and the electric ice maker to absorb heat and increase temperature, the return air from the return air shaft enters the gas side of the gas-water heat exchanger to release heat, and the ice made by the electric ice maker enters the ice storage tank for storage; after the secondary return water is heated, it enters electric compression heat pump one, electric compression heat pump two and electric compression heat pump three to release heat.

[0022] When the ambient temperature is <2℃, the primary network return water is divided into two paths. One path is heated sequentially by electric compression heat pump 1 and electric compression heat pump 2, and the other path is heated by electric compression heat pump 3. After the two paths are combined, they supply water to the primary network. The secondary water inlet and outlet of electric compression heat pump 1 are connected to the inlet and outlet on the evaporator side of electric compression heat pump 2, and the secondary water inlet and outlet of electric compression heat pump 2 are also connected to the inlet and outlet on the evaporator side of electric compression heat pump 2. The inlet and outlet on the condenser side of electric compression heat pump 2 are connected to the non-secondary water inlet and outlet of electric compression heat pump 2, and the inlet and outlet on the condenser side of electric compression heat pump 1 are connected to the non-secondary water inlet and outlet of electric compression heat pump 1. Outdoor air first enters at room temperature. The gas side of the surface cooler is preheated before being sent to the mine intake air shaft. After heat and humidity treatment of the underground air, it enters the gas-water heat exchanger from the return air shaft for waste heat recovery. The water side of the ambient temperature surface cooler is directly separated from the primary network water supply for heat exchange and flows back to the primary network return water pipeline. The secondary water supply, which is combined from the outlets of electric compression heat pump I, electric compression heat pump II, and electric compression heat pump III, simultaneously enters the water side of the gas-water heat exchanger and the electric ice maker to absorb heat and increase temperature. The return air from the return air shaft enters the gas side of the gas-water heat exchanger to release heat, and the ice made by the electric ice maker enters the ice storage tank for storage. After being heated, the secondary return water is combined and enters electric compression heat pump I, electric compression heat pump II, and electric compression heat pump III to release heat.

[0023] A thirteenth ...

[0024] When the heat of the primary water supply is excessive, the primary water supply enters the upper part of the hot water storage tank through the 20th valve in the third channel of the 14th three-way valve. At the same time, as the high-temperature water enters from the upper part, the low-temperature water in the lower part of the hot water storage tank flows out through the 19th valve and mixes with the primary water return.

[0025] When the heat supply from the primary network is insufficient, the return water from the primary network enters the lower part of the hot water storage tank through the 19th valve in the third channel of the 13th three-way valve. At the same time, as the low-temperature water enters from the lower part, the high-temperature water in the upper part of the hot water storage tank flows out through the 20th valve and mixes with the water supplied from the primary network.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. It makes full use of the characteristics of different air temperatures at different times in the natural environment, and uses natural cold sources for underground cooling and ice making and storage, saving the operating pump consumption; at the same time, it recovers the waste heat of the mine return air for auxiliary heating in the mining area and preheating of the shaft air for antifreeze.

[0028] 2. When the outdoor air temperature is low in winter, outdoor air is directly introduced into the mine for cooling; at this time, three electric compression heat pump units recover waste heat from the mine return air and heat generated by ice making to provide heat for the primary network return water temperature rise; at the same time, electric ice makers and ice storage tanks can make and store ice more quickly in winter to provide a heat source for the secondary network; making full use of natural resources.

[0029] 3. It can also provide a stable and reliable heat source for preheating and antifreeze of well air when the outdoor air temperature is below 2℃.

[0030] 4. Use secondary water inlet and outlet and non-secondary water inlet and outlet to switch the pipelines entering the condenser side and evaporator side of electric compression heat pump one and electric compression heat pump two, and switch the working status of the electric compression heat pump in a timely manner according to the ambient temperature. Attached Figure Description

[0031] Figure 1 This is a schematic flowchart of Embodiment 1 of a low-carbon mine cold and heat energy comprehensive utilization system of the present invention;

[0032] Figure 2 This is a schematic diagram of the process during summer operation (above 26℃) in Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the process during high-temperature operation (15-26℃) in the transitional season in Embodiment 1 of the present invention;

[0034] Figure 4 This is a schematic diagram of the process during low-temperature operation (5-15℃) in the transitional season in Embodiment 1 of the present invention;

[0035] Figure 5 This is a schematic diagram of the process during high-temperature operation (2-5℃) in winter in Embodiment 1 of the present invention;

[0036] Figure 6 This is a schematic diagram of the process during low-temperature operation (<2℃) in winter in Embodiment 1 of the present invention;

[0037] Figure 7 This is a flowchart illustrating Embodiment 2 of the present invention;

[0038] Figure 8 This is a schematic diagram of the process during summer operation (above 26℃) in Embodiment 2 of the present invention;

[0039] Figure 9 This is a schematic diagram of the process during high-temperature operation (15-26℃) in the transition season in Embodiment 2 of the present invention;

[0040] Figure 10 This is a schematic diagram of the process during low-temperature operation (5-15℃) in the transitional season in Embodiment 2 of the present invention;

[0041] Figure 11 This is a schematic diagram of the process during high-temperature operation (2-5℃) in winter in Embodiment 2 of the present invention;

[0042] Figure 12 This is a schematic diagram of the process during low-temperature operation (<2℃) in winter in Embodiment 2 of the present invention. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings.

[0044] like Figure 1 The embodiment 1 of the present invention shown includes: a primary water supply network, a primary water return network, a secondary water supply network, a secondary water return network, a tertiary water supply network, a tertiary water return network, a gas-water heat exchanger, a cooling tower, a circulating water pump, an electric compression heat pump I, an electric compression heat pump II, an electric compression heat pump III, an electric ice maker, an ice storage tank, a hot water storage tank, a normal temperature surface cooler, a low temperature surface cooler, an ultra-low temperature surface cooler, a regulating valve, and connecting pipelines. The outdoor air pipeline is connected to the normal temperature surface cooler, the low temperature surface cooler, and the ultra-low temperature surface cooler, respectively. The normal temperature surface cooler, the low temperature surface cooler, and the ultra-low temperature surface cooler are sequentially connected and connected to the ventilation shaft. Mine fresh air enters the ventilation shaft, absorbs heat through the mine's underground ventilation system, and is then connected to the return air shaft. The return air from the return air shaft enters the gas side of the gas-water heat exchanger for heat release or is directly discharged into the atmosphere. The ice storage tank is connected to the electric ice maker and the ultra-low temperature surface cooler through pipelines to form a loop.

[0045] The primary return water (35℃) sequentially passes through the following valves: 13th valve V13, 16th tee 16, 13th tee 13, 15th valve V15, 1st tee 1, non-secondary water inlet / outlet of electric compression heat pump one (condenser side or evaporator side), circulating water pump, 2nd tee 2, 16th valve V16, 3rd tee 3, non-secondary water inlet / outlet of electric compression heat pump two (condenser side or evaporator side), circulating water pump, 4th tee 4, 17th valve V17, condenser side of electric compression heat pump three, 18th valve V18, 15th tee 15, 14th tee 14, 14th tee 15 ... Valve V14 is connected to the primary water supply network (70℃); the third path of the fifteenth three-way 15 is connected to the third path of the sixteenth three-way 16 via the second valve V21, the seventeenth three-way 17, the water side of the ambient temperature surface cooler, the eighteenth three-way 18, the second valve V22, and the third path of the sixteenth three-way 16; the third path of the seventeenth three-way 17 is connected to the third path of the second three-way 2 via the second valve V2; the third path of the eighteenth three-way 18 is connected to the third path of the first three-way 1 via the first valve V1; the third path of the fourth three-way 4 is connected to the third path of the low temperature surface cooler via the third valve V3, the water side of the low temperature surface cooler, the fourth valve V4, and the third path of the third three-way 3.

[0046] Water flowing out from the water side of the gas-water heat exchanger passes through valve 7 (V7), twelfth three-way valve 12, and the circulating water pump, then merges with water flowing out of the electric ice maker to form secondary network return water. This water then flows through twelfth three-way valve 6, thirteenth three-way valve 10, eighth three-way valve 8, and twelfth valve V12 into the evaporator side of the electric compression heat pump 3. Subsequently, the evaporator side outlet of the electric compression heat pump 3 flows through eleventh valve V11, seventh three-way valve 7, ninth three-way valve 9, and fifth three-way valve 5, serving as secondary network supply water. This water then returns to the water side of the gas-water heat exchanger via twelfth three-way valve 11 and eighth valve V8. The third path of fifth three-way valve 5 connects to the third path of sixth three-way valve 6 via fifth valve V5, cooling tower, sixth valve V6, and the circulating water pump. The third path of eighth three-way valve 8 sequentially flows through... The third valve V32, the secondary water inlet / outlet (evaporator side or condenser side) of electric compression heat pump one, and the third valve V31 are connected to the third path of the seventh three-way 7; the third path of the thirteenth channel 10 is connected to the third path of the ninth three-way 9 via the secondary water inlet / outlet (evaporator side or condenser side) of electric compression heat pump two; the third path of the eleventh three-way 11 is connected to the third path of the twelfth three-way 12 via the tenth valve V10, the electric ice maker, and the ninth valve V9; the secondary network return water enters the evaporator side of electric compression heat pump one, the evaporator side of electric compression heat pump two, and the evaporator side of electric compression heat pump three respectively to release heat, and then merges to become the secondary network supply water; the secondary network supply water then enters the water side of the gas-water heat exchanger and the electric ice maker to absorb heat;

[0047] All types of surface coolers, including ambient temperature surface coolers, low temperature surface coolers, and ultra-low temperature surface coolers, can use a tertiary network for water supply and return to exchange heat with outdoor air to raise the temperature.

[0048] When the low-temperature surface cooler is working, the secondary water inlet and outlet of the electric compression heat pump II are connected to the inlet and outlet on the condenser side of the electric compression heat pump II, and the inlet and outlet on the evaporator side of the electric compression heat pump II are connected to the inlet and outlet on the water side of the low-temperature surface cooler through the non-secondary water inlet and outlet of the electric compression heat pump II. The tertiary network water (7℃) supplied by the electric compression heat pump II goes to the water side of the low-temperature surface cooler to absorb heat through the circulating water pump, the fourth three-way valve 4 and the third valve V3, and the tertiary network return water (12℃) returns to the electric compression heat pump II to release heat through the fourth valve V4 and the third three-way valve 3.

[0049] When the cryogenic surface cooler is working, the tertiary network water supply (0℃) provided by the ice storage tank enters the water side of the cryogenic surface cooler through the circulating water pump to absorb heat, and the tertiary network return water (7℃) returns to the ice storage tank to cool down.

[0050] When the ambient temperature surface cooler is working, it can use outdoor air to heat the tertiary network water. The 21st valve V21, the 22nd valve V22, the 15th valve V15, and the 16th valve V16 are closed, while the 1st valve V1 and the 2nd valve V2 are open. The secondary water inlet and outlet of the electric compression heat pump 1 are connected to the inlet and outlet on the condenser side of the electric compression heat pump 1. The inlet and outlet on the evaporator side of the electric compression heat pump 1 are connected to the inlet and outlet on the water side of the ambient temperature surface cooler through the non-secondary water inlet and outlet of the electric compression heat pump 1. The tertiary network water (16℃) supplied by the electric compression heat pump 1 absorbs heat on the water side of the ambient temperature surface cooler through the circulating water pump, the second three-way valve 2, the second valve V2, and the seventeenth three-way valve 17. The tertiary network return water (23℃) returns to the electric compression heat pump 1 to release heat through the eighteenth three-way valve 18, the first valve V1, and the first three-way valve 1.

[0051] The ambient temperature surface cooler can also use the primary network water supply to heat (preheat) the outdoor air. The first valve V1 and the second valve V2 are closed, and the twenty-first valve V21, the twenty-second valve V22, the fifteenth valve V15 and the sixteenth valve V16 are opened. The primary network water supply is branched off from the fifteenth three-way valve 15, enters the ambient temperature surface cooler through the twenty-first valve V21 and the seventeenth three-way valve 17 to release heat, and then returns to the primary network return water through the eighteenth three-way valve 18, the twenty-second valve V22 and the sixteenth three-way valve 16, and then sequentially enters the electric compression heat pump one, the electric compression heat pump two and the electric compression heat pump three to absorb heat.

[0052] The hot water storage tank is used for peak shaving. When the heat of the primary network water supply is sufficient and abundant, it stores the excess hot water in the primary network water supply. The primary network water supply enters the upper part of the hot water storage tank through the third channel of the fourteenth three-way 14 via the twentieth valve V20. At the same time, as the high temperature water enters from the upper part, the low temperature water in the lower part of the hot water storage tank flows out through the nineteenth valve V19 and mixes with the primary network return water.

[0053] When the heat of the primary network water supply is insufficient, it is supplemented by hot water in the hot water storage tank. The return water of the primary network enters the lower part of the hot water storage tank through the third path of the thirteenth three-way 13 via the nineteenth valve V19. At the same time, as the low temperature water enters the lower part, the high temperature water in the upper part of the hot water storage tank flows out through the twentieth valve V20 and mixes with the water supplied by the primary network.

[0054] When operating in summer (ambient temperature > 26℃), it is necessary to perform a three-stage cooling process on the outdoor air. Figure 2As shown, the return air is not cooled and is directly discharged; electric compression heat pump one, electric compression heat pump two, and the ice storage tank are turned on. The secondary water inlet and outlet of electric compression heat pump one are connected to the inlet and outlet on the condenser side of electric compression heat pump one. The inlet and outlet on the evaporator side of electric compression heat pump one are connected to the inlet and outlet on the water side of the ambient temperature surface cooler through the non-secondary water inlet and outlet of electric compression heat pump one. The secondary water inlet and outlet of electric compression heat pump two are connected to the inlet and outlet on the condenser side of electric compression heat pump two. The inlet and outlet on the evaporator side of electric compression heat pump two are connected to the non-secondary water inlet and outlet of electric compression heat pump two. The secondary water inlet and outlet are connected to the inlet and outlet on the water side of the low-temperature surface cooler; outdoor air first enters the gas side of the ambient temperature surface cooler for cooling, then enters the gas side of the low-temperature surface cooler for secondary cooling, then enters the gas side of the ultra-low temperature surface cooler for tertiary cooling, and finally is sent into the mine intake air shaft. After the underground air undergoes heat and humidity treatment, it is discharged into the atmosphere from the mine return air shaft; at this time, the first valve V1, the second valve V2, the third valve V3, the fourth valve V4, the fifth valve V5, the sixth valve V6, the third-first valve V31, and the third-second valve V32 are open, and the other valves are closed;

[0055] When operating at high temperatures during the transitional season (ambient temperature 15℃~26℃) Figure 3 As shown, only two-stage cooling of the outdoor air is required: First, one electric compression heat pump is turned on, and then another electric compression heat pump is turned on. The secondary water inlet and outlet of the second electric compression heat pump are connected to the inlet and outlet on the condenser side of the second electric compression heat pump. The inlet and outlet on the evaporator side of the second electric compression heat pump are connected to the inlet and outlet on the water side of the low-temperature surface cooler through the non-secondary water inlet and outlet of the second electric compression heat pump. The outdoor air directly enters the gas side of the low-temperature surface cooler for cooling, then enters the ultra-low temperature surface cooler for secondary cooling, and finally is sent into the mine intake air shaft. After heat and humidity treatment of the underground air, it is discharged into the atmosphere through the return air shaft. The condenser side of the second electric compression heat pump is cooled by heat exchange through a cooling tower, and the water side of the ultra-low temperature surface cooler is cooled by heat exchange with an ice storage tank. At this time, the third valve V3, the fourth valve V4, the fifth valve V5, and the sixth valve V6 are open, and the other valves are closed.

[0056] When operating at low temperatures during the transitional season (ambient temperature 5℃~15℃), such as Figure 4 As shown, only one level of cooling treatment is required for the outdoor air: without turning on the electric compression heat pump or the gas-water heat exchanger, the outdoor air directly enters the gas side of the ultra-low temperature surface cooler for cooling and is sent into the mine intake air shaft. After the underground air is treated with heat and humidity, it is discharged into the atmosphere from the return air shaft; the ultra-low temperature surface cooler exchanges heat with the ice storage tank.

[0057] In winter operation, the cooler outdoor air can be used directly for cooling and ice production in the well without the need for a surface cooler. Simultaneously, heat from the return air is recovered for auxiliary heating. A hot water storage tank is installed as a peak-shaving heat source for auxiliary heating. In this case, wellbore freezing protection needs to be considered depending on the outdoor air temperature. Therefore, there are two operating modes depending on whether wellbore freezing protection is required:

[0058] When operating in high temperatures during winter (ambient temperature 2℃~5℃) Figure 5As shown, without considering wellbore freeze protection, with three electric compression heat pumps running, the 35°C primary network return water is sequentially heated by electric compression heat pump 1, electric compression heat pump 2, and electric compression heat pump 3 to provide primary network supply water at approximately 70°C. The secondary water inlet and outlet of electric compression heat pump 1 are connected to the condenser side inlet and outlet of electric compression heat pump 1, and the evaporator side inlet and outlet of electric compression heat pump 1 are connected to the inlet and outlet of the ambient temperature surface cooler water side through the non-secondary water inlet and outlet of electric compression heat pump 1. The secondary water inlet and outlet of electric compression heat pump 2 are connected to the condenser side inlet and outlet of electric compression heat pump 2, and the evaporator side inlet and outlet of electric compression heat pump 2 are connected to the low temperature surface cooler water side inlet and outlet through the non-secondary water inlet and outlet of electric compression heat pump 2. Outdoor air is directly supplied to the mine's intake air shaft. After undergoing heat and humidity treatment, the air enters the gas-water heat exchanger from the return air shaft for waste heat recovery. Secondary water supplied from the outlets of electric compression heat pumps 1, 2, and 3 simultaneously enters the water side of the gas-water heat exchanger and is heated by an electric ice maker. Return air from the return air shaft enters the gas side of the gas-water heat exchanger and releases heat. Ice produced by the electric ice maker is stored in an ice storage tank. After heating, the secondary return water merges and releases heat through electric compression heat pumps 1, 2, and 3. Specifically, in the primary network water: valves thirteen (V13), fourteen (V14), fifteen (V15), sixteen (V16), seventeen (V17), and... Valve V18 (18th valve) is open; valves V1 (1st valve), V2 (2nd valve), V3 (3rd valve), V4 (4th valve), V19 (19th valve), V20 (20th valve), V21 (21st valve), and V22 (22nd valve) are closed. The primary network return water flows sequentially through valve V13 (13th valve), twelfth three-way valve (16th valve), twelfth three-way valve (13th valve), twelfth valve V15, twelfth three-way valve (1st valve), the condenser side of electric compression heat pump one, the circulating water pump, twelfth three-way valve (2nd valve), twelfth valve V16, twelfth three-way valve (3rd valve), the condenser side of electric compression heat pump two, the circulating water pump, valve V17 (17th valve), the condenser side of electric compression heat pump three, valve V18 (18th valve), and valve V14 (14th valve) as the primary network water supply. Specifically, in the secondary network water: valve V17... Valve V7, valve V8, valve V9, valve V10, valve V11, valve V12, valve V31, and valve V32 are open, while valve V5 and valve V6 are closed. Hot water from the water side of the gas-water heat exchanger and the electric ice maker converges at the 12th three-way valve 12 to form secondary network return water (12℃). After being pumped by the circulating water pump, it first flows to the 13th three-way valve 10 and is divided into two paths. One path enters the electric compression heat pump evaporator side for heat release and cooling, while the other path flows to the 8th three-way valve 8 and is divided into two paths. One path enters the electric compression heat pump evaporator side for heat release and cooling via valve V32, while the other path enters the electric compression heat pump evaporator side for heat release and cooling via valve V12.The chilled water cooled by the electric compression heat pump is connected to the water supply cooled by the electric compression heat pump at the 7th three-way valve 7 via the 11th valve V11. Then, it is connected to the water supply cooled by the electric compression heat pump at the 9th three-way valve 9 to form a secondary network water supply (7℃). The secondary network water supply is divided into two paths: one path enters the electric ice maker to absorb heat through the 10th valve V10, and the other path enters the gas-water heat exchanger to absorb heat through the 8th valve V8.

[0059] When operating at low temperatures in winter (ambient temperature < 2℃) Figure 6 As shown, wellbore freeze protection needs to be considered. Three electric compression heat pumps are activated. The primary network return water (35℃) is sequentially heated by electric compression heat pump one, electric compression heat pump two, and electric compression heat pump three to provide primary network supply water (approximately 70℃). Outdoor air first enters the gas side of the ambient temperature surface cooler for preheating before being sent to the mine intake shaft for heat and humidity treatment of the underground air. The water side of the ambient temperature surface cooler directly draws a heat exchange path from the primary network supply water and flows back to the primary network. The return water pipeline consists of secondary supply water (7℃) from the outlets of electric compression heat pumps 1, 2, and 3. This water simultaneously enters the water side of the gas-water heat exchanger and the electric ice maker to absorb heat and increase its temperature. Return air from the return air shaft enters the gas side of the gas-water heat exchanger to release heat. Ice produced by the electric ice maker is stored in an ice storage tank. After heating, the secondary return water (12℃) merges and then enters electric compression heat pumps 1, 2, and 3 to release heat. The specific operating methods of the primary and secondary water networks are the same as those during high-temperature winter operation.

[0060] In this embodiment, during winter operation, the primary network return water is connected to the lower part of the hot water storage tank via the 13th three-way valve 13 and the 19th valve V19. The hot water storage tank is connected to the primary network supply water via the 20th valve V20 and the 14th three-way valve 14. The hot water storage tank operates for peak shaving: ① During heat absorption: When the heat of the primary network supply water is sufficient and abundant, the excess hot water in the primary network supply water is stored. The primary network supply water enters the upper part of the hot water storage tank through the 20th valve V20 via the third path of the 14th three-way valve 14. At the same time, as the high-temperature water enters from the upper part, the low-temperature water in the lower part of the hot water storage tank flows out through the 19th valve V19 and mixes with the primary network return water; ② During heat release: When the heat of the primary network supply water is insufficient, it is supplemented by hot water in the hot water storage tank. The primary network return water enters the lower part of the hot water storage tank through the 19th valve V19 via the third path of the 13th three-way valve 13. At the same time, as the low-temperature water enters from the lower part, the high-temperature water in the upper part of the hot water storage tank flows out through the 20th valve V20 and mixes with the primary network supply water.

[0061] like Figure 7The difference between Embodiment 2 and Embodiment 1 is as follows: 1. The pipes at both ends of the seventeenth valve V17 are no longer connected to the condenser side of the electric compression heat pump 3 and the fourth tee 4. The nineteenth tee 19 is installed on the pipes of the thirteenth tee 13 and the fifteenth valve V15. The third path of the nineteenth tee 19 is connected to the seventeenth valve V17. 2. The twenty-third tee 20 is installed on the pipes of the eighteenth valve V18 and the fifteenth tee 15. The third path of the fourth tee 4 is connected to the third path of the twenty-third tee 20 through the second and third valve V23.

[0062] Example 2 specifically includes: a primary water supply network, a primary water return network, a secondary water supply network, a secondary water return network, a tertiary water supply network, a tertiary water return network, a gas-water heat exchanger, a cooling tower, a circulating water pump, an electric compression heat pump I, an electric compression heat pump II, an electric compression heat pump III, an electric ice maker, an ice storage tank, a hot water storage tank, a normal temperature surface cooler, a low temperature surface cooler, an ultra-low temperature surface cooler, regulating valves, and connecting pipelines. The outdoor air pipeline is connected to the normal temperature surface cooler, the low temperature surface cooler, and the ultra-low temperature surface cooler, respectively. The normal temperature surface cooler, the low temperature surface cooler, and the ultra-low temperature surface cooler are sequentially connected and connected to the ventilation shaft. After entering the ventilation shaft, the mine's fresh air absorbs heat through the mine's underground ventilation system and is then connected to the return air shaft. The return air from the return air shaft enters the gas side of the gas-water heat exchanger for heat release or is directly discharged into the atmosphere. The ice storage tank is connected to the electric ice maker and the ultra-low temperature surface cooler through pipelines to form a loop.

[0063] The primary return water (35℃) sequentially passes through valve 13 (V13), tee 16 (16), and tee 13 (13) into tee 19 (19), then splits into two paths. One path sequentially passes through valve 15 (V15), tee 1 (1), the non-secondary water inlet / outlet of electric compression heat pump 1 (condenser side or evaporator side), the circulating water pump, tee 2 (2), valve 16 (V16), tee 3 (3), the non-secondary water inlet / outlet of electric compression heat pump 2 (condenser side or evaporator side), the circulating water pump, tee 4 (4), and tee 2 (V23) and tee 23 (20). The other path passes through valve 17 (V17), the condenser side of electric compression heat pump 3, valve 18 (V18), and tee 23 (20). The two paths converge at tee 23 (20) and then sequentially pass through valve 15 (V15), tee 1 (16), and tee 23 (20). Connect 15 and 14th valve V14 to the primary water supply network (50℃); the third path of 15th three-way 15 is connected to the third path of 16th three-way 16 via 21st valve, 17th three-way 17, the water side of the ambient temperature surface cooler, 18th three-way 18, 22nd valve V22; the third path of 17th three-way 17 is connected to the third path of 2nd three-way 2 via 2nd valve V2; the third path of 18th three-way 18 is connected to the third path of 1st three-way 1 via 1st valve V1; the third path of 13th three-way 13 is connected to the third path of 19th valve V19, the hot water storage tank, 20th valve V20, and 14th three-way 14; the third path of 4th three-way 4 is connected to the third path of 3rd valve V3, the water side of the low temperature surface cooler, 4th valve V4, and 3rd three-way 3.

[0064] The water flowing out from the water side of the gas-water heat exchanger passes through valve 7 (V7), twelfth three-way valve 12, and the circulating water pump, then merges with the water flowing out of the electric ice maker to form secondary network return water. This secondary network return water then enters the evaporator sides of electric compression heat pump 1, electric compression heat pump 2, and electric compression heat pump 3 respectively for heat release, before merging to form secondary network supply water. This secondary network supply water then enters the water side of the gas-water heat exchanger and absorbs heat from the electric ice maker. Specifically, the secondary network return water passes through twelfth three-way valve 6, thirteenth three-way valve 10, eighth three-way valve 8, and twelfth valve V12 to enter the evaporator side of electric compression heat pump 3. Subsequently, the outlet of the evaporator side of electric compression heat pump 3 passes sequentially through eleventh valve V11, seventh three-way valve 7, ninth three-way valve 9, and fifth three-way valve V11. After the tee 5, it serves as the secondary network water supply, returning to the water side of the gas-water heat exchanger via the eleventh tee 11 and the eighth valve V8; the third path of the fifth tee 5 is connected to the third path of the sixth tee 6 via the fifth valve V5, cooling tower, sixth valve V6, and circulating water pump; the third path of the eighth tee 8 is connected to the third path of the seventh tee 7 via the third second valve V32, the secondary water inlet / outlet (evaporator side or condenser side) of the electric compression heat pump one, and the third first valve V31; the third path of the thirteenth tee 10 is connected to the third path of the ninth tee 9 via the secondary water inlet / outlet (evaporator side or condenser side) of the electric compression heat pump two; the third path of the eleventh tee 11 is connected to the third path of the twelfth tee 12 via the tenth valve V10, electric ice maker, and ninth valve V9.

[0065] All types of surface coolers, including ambient temperature surface coolers, low temperature surface coolers, and ultra-low temperature surface coolers, can use a tertiary network for water supply and return to exchange heat with outdoor air to raise the temperature.

[0066] When the low-temperature surface cooler is working, the secondary water inlet and outlet of the electric compression heat pump 2 are connected to the inlet and outlet on the condenser side of the electric compression heat pump 2, and the inlet and outlet on the evaporator side of the electric compression heat pump 2 are connected to the inlet and outlet on the water side of the low-temperature surface cooler through the non-secondary water inlet and outlet of the electric compression heat pump 2. The tertiary network water (7℃) supplied by the electric compression heat pump 2 goes to the water side of the normal temperature surface cooler through the circulating water pump, the fourth three-way valve 4 and the third valve V3 to absorb heat, and the tertiary network return water (12℃) goes back to the electric compression heat pump 2 through the fourth valve V4 and the third three-way valve 3 to release heat.

[0067] When the cryogenic surface cooler is working, the tertiary network water supply (0℃) provided by the ice storage tank enters the water side of the cryogenic surface cooler through the circulating water pump to absorb heat, and the tertiary network return water (7℃) returns to the ice storage tank to cool down.

[0068] When the ambient temperature surface cooler is working, it can use outdoor air to heat the tertiary network water. The 21st valve V21, the 22nd valve V22, the 15th valve V15, and the 16th valve V16 are closed, while the 1st valve V1 and the 2nd valve V2 are open. The secondary water inlet and outlet of the electric compression heat pump 1 are connected to the inlet and outlet on the condenser side of the electric compression heat pump 1. The inlet and outlet on the evaporator side of the electric compression heat pump 1 are connected to the inlet and outlet on the water side of the ambient temperature surface cooler through the non-secondary water inlet and outlet of the electric compression heat pump 1. The tertiary network water (16℃) supplied by the electric compression heat pump 1 absorbs heat on the water side of the ambient temperature surface cooler through the circulating water pump, the second three-way valve 2, the second valve V2, and the seventeenth three-way valve 17. The tertiary network return water (23℃) returns to the electric compression heat pump 1 to release heat through the eighteenth three-way valve 18, the first valve V1, and the first three-way valve 1.

[0069] The ambient temperature surface cooler can also use the primary network water supply to heat (preheat) the outdoor air. The first valve V1 and the second valve V2 are closed, and the twenty-first valve V21, the twenty-second valve V22, the fifteenth valve V15 and the sixteenth valve V16 are opened. The primary network water supply is branched off from the fifteenth three-way 15, enters the ambient temperature surface cooler through the twenty-first valve V21 and the seventeenth three-way 17 to release heat, and then returns to the primary network return water through the eighteenth channel 18, the twenty-second valve V22 and the sixteenth three-way 16. At the same time, it enters the electric compression heat pump one and the electric compression heat pump three to absorb heat.

[0070] The hot water storage tank is used for peak shaving. When the heat of the primary network water supply is sufficient and abundant, it stores the excess hot water in the primary network water supply. The primary network water supply enters the upper part of the hot water storage tank through the third channel of the fourteenth three-way 14 via the twentieth valve V20. At the same time, as the high temperature water enters from the upper part, the low temperature water in the lower part of the hot water storage tank flows out through the nineteenth valve V19 and mixes with the primary network return water.

[0071] When the heat of the primary network water supply is insufficient, it is supplemented by hot water in the hot water storage tank. The return water of the primary network enters the lower part of the hot water storage tank through the third path of the thirteenth three-way 13 via the nineteenth valve V19. At the same time, as the low temperature water enters the lower part, the high temperature water in the upper part of the hot water storage tank flows out through the twentieth valve V20 and mixes with the water supplied by the primary network.

[0072] When operating in summer (ambient temperature > 26℃), it is necessary to perform a three-stage cooling process on the outdoor air. Figure 8As shown, start electric compression heat pump one, electric compression heat pump two, and the ice storage tank. The secondary water inlet and outlet of electric compression heat pump one are connected to the inlet and outlet on the condenser side of electric compression heat pump one. The inlet and outlet on the evaporator side of electric compression heat pump one are connected to the inlet and outlet on the water side of the ambient temperature surface cooler through the non-secondary water inlet and outlet of electric compression heat pump one. The secondary water inlet and outlet of electric compression heat pump two are connected to the inlet and outlet on the condenser side of electric compression heat pump two. The inlet and outlet on the evaporator side of electric compression heat pump two are connected to the inlet and outlet on the water side of the low temperature surface cooler through the non-secondary water inlet and outlet of electric compression heat pump two. The ice storage tank provides three... The secondary water supply enters the ultra-low temperature surface cooler via a circulating water pump to absorb heat, while the tertiary water return returns to the ice storage tank for cooling. Outdoor air first enters the gas side of the ambient temperature surface cooler for cooling, then enters the gas side of the low temperature surface cooler for secondary cooling, and then enters the gas side of the ultra-low temperature surface cooler for tertiary cooling. Finally, it is sent to the mine intake air shaft, where the underground air undergoes heat and humidity treatment before being discharged into the atmosphere through the mine return air shaft. At this time, valves V1, V2, V3, V4, V5, V6, V31, and V32 are open, while other valves are closed.

[0073] When operating at high temperatures during the transitional season (ambient temperature 15℃~26℃) Figure 9 As shown, only two-stage cooling of the outdoor air is required: First, one electric compression heat pump is turned on, and then another electric compression heat pump is turned on. The secondary water inlet and outlet of the second electric compression heat pump are connected to the inlet and outlet on the condenser side of the second electric compression heat pump. The inlet and outlet on the evaporator side of the second electric compression heat pump are connected to the inlet and outlet on the water side of the low-temperature surface cooler through the non-secondary water inlet and outlet of the second electric compression heat pump. The outdoor air directly enters the gas side of the low-temperature surface cooler for cooling, then enters the ultra-low temperature surface cooler for secondary cooling, and finally is sent into the mine intake air shaft. After heat and humidity treatment of the underground air, it is discharged into the atmosphere through the return air shaft. The evaporator side of the second electric compression heat pump is cooled by heat exchange through a cooling tower, and the water side of the ultra-low temperature surface cooler is cooled by heat exchange with an ice storage tank. At this time, the third valve V3, the fourth valve V4, the fifth valve V5, and the sixth valve V6 are open, and the other valves are closed.

[0074] When operating at low temperatures during the transitional season (ambient temperature 5℃~15℃) Figure 10 As shown, only one level of cooling treatment is required for the outdoor air: without turning on the electric compression heat pump or the gas-water heat exchanger, the outdoor air directly enters the gas side of the ultra-low temperature surface cooler for cooling and is sent into the mine intake air shaft. After the underground air is treated with heat and humidity, it is discharged into the atmosphere from the return air shaft; the ultra-low temperature surface cooler exchanges heat with the ice storage tank.

[0075] In winter operation, the cooler outdoor air can be used directly for cooling and ice production in the well without the need for a surface cooler. Simultaneously, heat from the return air is recovered for auxiliary heating. A hot water storage tank is installed as a peak-shaving heat source for auxiliary heating. In this case, wellbore freezing protection needs to be considered depending on the outdoor air temperature. Therefore, there are two operating modes depending on whether wellbore freezing protection is required:

[0076] When operating in high temperatures during winter (ambient temperature 2℃~5℃) Figure 11As shown, without considering wellbore antifreeze, three electric compression heat pumps are activated. The primary network return water at 35°C is divided into two paths. One path heats the water sequentially through the evaporator sides of electric compression heat pump one and electric compression heat pump two, while the other path heats the water through the evaporator side of electric compression heat pump three. After the two paths are combined, they provide primary network water at approximately 50°C. The secondary water inlet and outlet of electric compression heat pump one are connected to the inlet and outlet of its evaporator side, and the secondary water inlet and outlet of electric compression heat pump two are connected to the inlet and outlet of its evaporator side. The condenser side inlet and outlet of electric compression heat pump one are connected to the primary network water through its non-secondary water inlet and outlet. The inlet and outlet of the condenser side of the compression heat pump II are connected to the primary water network through the non-secondary water inlet and outlet of the electric compression heat pump II; outdoor air is directly sent into the mine intake air shaft, and after the underground air is treated with heat and humidity, it enters the gas-water heat exchanger from the return air shaft for return air waste heat recovery; the secondary water supply from the outlets of electric compression heat pump I, electric compression heat pump II and electric compression heat pump III enters the water side of the gas-water heat exchanger and the electric ice maker to absorb heat and increase temperature, the return air from the return air shaft enters the gas side of the gas-water heat exchanger to release heat, and the ice made by the electric ice maker enters the ice storage tank for storage; after the secondary return water is heated, it enters electric compression heat pump I, electric compression heat pump II and electric compression heat pump III to release heat. Specifically, in the primary network water flow: valves 13, 14, 15, 16, 17, and 18 are open; valves 11, 2, 3, 4, 19, 20, 21, and 22 are closed. The primary network return water first flows through valve 13, 16-3-16, and 13-3-13 to 19-3-19, where it splits into two paths. One path directly enters the electric compression heat pump triple condenser via valve 17, which is then passed through valve 17. The heat is absorbed from the side and the temperature rises. The returned water from the primary network becomes the primary network supply water. It flows through the eighteenth valve V18 to the fifteenth three-way valve 15. Another path flows through the fifteenth valve V15 and the first three-way valve 1 to the condenser side of the electric compression heat pump one for heating. Then it flows through the circulating water pump, the second three-way valve 2, the sixteenth valve V16, and the third three-way valve 3 to the condenser side of the electric compression heat pump two for heating. Then it flows through the circulating water pump, the fourth three-way valve 4, and the second three-way valve V23 to the twenty-third channel 20, where it mixes with the primary network supply water from the electric compression heat pump three. The mixed primary network supply water then flows through the fifteenth three-way valve 15 and the fourteenth valve V14 as the primary network supply water for heating.Specifically, in the secondary network water: valves V7, V8, V9, V10, V11, V12, V32, and V31 are open; valves V5 and V6 are closed. Hot water from the water side of the gas-water heat exchanger and the electric ice maker converges at the 12th three-way valve (12) to form the secondary network return water. This water is then pumped to the 13th three-way valve (10) and splits into two paths. One path enters the evaporator side of the electric compression heat pump for heat release and cooling; the other path flows to the 8th three-way valve (8) and splits into two paths. One path then... The third valve V32 enters the evaporator side of the electric compression heat pump one for heat release and cooling, while the other enters the evaporator side of the electric compression heat pump three for heat release and cooling via the twelfth valve V12. The chilled water cooled by the electric compression heat pump three passes through the eleventh valve V11 and merges with the water supply cooled by the electric compression heat pump one at the seventh three-way 7. Subsequently, it merges with the water supply cooled by the electric compression heat pump two at the ninth three-way 9 to form a secondary network water supply. The secondary network water supply is divided into two paths: one path enters the electric ice maker for heat absorption via the tenth valve V10, and the other path enters the gas-water heat exchanger for heat absorption via the eighth valve V8.

[0077] When operating at low temperatures in winter (ambient temperature < 2℃) Figure 12 As shown, wellbore freeze protection needs to be considered. Three electric compression heat pumps are operated. The primary network return water at 35°C is divided into two paths. One path is heated sequentially by electric compression heat pump 1 and electric compression heat pump 2, while the other path is heated by electric compression heat pump 3. After the two paths are combined, they provide primary network water at approximately 50°C. The secondary water inlet and outlet of electric compression heat pump 1 are connected to the evaporator-side inlet and outlet of electric compression heat pump 2. The secondary water inlet and outlet of electric compression heat pump 2 are also connected to the evaporator-side inlet and outlet of electric compression heat pump 2. The condenser-side inlet and outlet of electric compression heat pump 1 are connected to the primary network water through the non-secondary water inlet and outlet of electric compression heat pump 1. The condenser-side inlet and outlet of electric compression heat pump 2 are connected to the primary network water through electric compression heat pump 3. The non-secondary water inlet and outlet of heat pump two are connected to the primary network water. Outdoor air first enters the gas side of the ambient temperature surface cooler for preheating, then is sent to the mine intake air shaft. After the underground air undergoes heat and humidity treatment, the water side of the ambient temperature surface cooler directly separates a heat exchange path from the primary network water supply and flows back to the primary network return water pipeline. The secondary water supply, which is combined from the outlets of electric compression heat pump one, electric compression heat pump two, and electric compression heat pump three, simultaneously enters the water side of the gas-water heat exchanger and the electric ice maker to absorb heat and increase its temperature. The return air from the return air shaft enters the gas side of the gas-water heat exchanger to release heat, and the ice made by the electric ice maker enters the ice storage tank for storage. After being heated, the secondary return water merges and enters electric compression heat pump one, electric compression heat pump two, and electric compression heat pump three to release heat. The specific operating mode of the primary and secondary network water is the same as that during high-temperature operation in winter.

[0078] In this embodiment, during winter operation, the primary network return water enters the hot water storage tank through the 13th three-way valve 13 and the 19th valve V19 for peak regulation, and then returns to the primary network supply water through the 20th valve V20 and the 14th three-way valve 14; ① During heat absorption: When the primary network supply water has sufficient and abundant heat, the excess hot water in the primary network supply water is stored. The primary network supply water enters the upper part of the hot water storage tank through the 20th valve V20 via the third path of the 14th three-way valve 14. At the same time, with the entry of the high-temperature water in the upper part, the low-temperature water in the lower part of the hot water storage tank flows out through the 19th valve V19 and mixes with the primary network return water; ② During heat release: When the primary network supply water has insufficient heat, it is supplemented by hot water in the hot water storage tank. The primary network return water enters the lower part of the hot water storage tank through the 19th valve V19 via the third path of the 13th three-way valve 13. At the same time, with the entry of the low-temperature water in the lower part, the high-temperature water in the upper part of the hot water storage tank flows out through the 20th valve V20 and mixes with the primary network supply water.

Claims

1. A low-carbon mine cold and heat energy comprehensive utilization system, characterized in that, The system comprises: primary network water supply, primary network water return, secondary network water supply, secondary network water return, tertiary network water supply, tertiary network water return, gas-water heat exchanger, cooling tower, electric compression heat pump one, electric compression heat pump two, electric compression heat pump three, electric ice maker, ice storage tank, normal temperature surface cooler, low temperature surface cooler and ultra-low temperature surface cooler, wherein the outdoor air pipe network is connected with the normal temperature surface cooler, the low temperature surface cooler and the ultra-low temperature surface cooler respectively, the normal temperature surface cooler, the low temperature surface cooler and the ultra-low temperature surface cooler are connected in sequence and introduced into the ventilation shaft; the mine fresh air is connected with the return air shaft after being heated by the mine underground ventilation system, the return air of the return air shaft is discharged into the atmosphere or directly discharged into the atmosphere through the gas side of the gas-water heat exchanger; the ice storage tank is connected with the electric ice maker and the ultra-low temperature surface cooler through the pipeline to form a loop; The primary network water return is connected with the primary network water supply in sequence through the thirteenth valve (V13), the sixteenth three-way valve (16), the fifteenth valve (V15), the first three-way valve (1), the non-secondary water inlet and outlet of the electric compression heat pump one, the circulating water pump, the second three-way valve (2), the sixteenth valve (V16), the third three-way valve (3), the non-secondary water inlet and outlet of the electric compression heat pump two, the circulating water pump, the fourth three-way valve (4), the seventeenth valve (V17), the non-secondary water inlet and outlet of the electric compression heat pump three, the eighteenth valve (V18), the fifteenth three-way valve (15) and the fourteenth valve (V14); the third path of the fifteenth three-way valve (15) is connected with the third path of the sixteenth three-way valve (16) through the second one valve (V21), the seventeenth three-way valve (17), the water side of the normal temperature surface cooler, the eighteenth three-way valve (18) and the second two valve (V22), the third path of the seventeenth three-way valve (17) is connected with the third path of the second three-way valve (2) through the second valve (V2), and the third path of the eighteenth three-way valve (18) is connected with the third path of the first three-way valve (1) through the first valve (V1); the third path of the fourth three-way valve (4) is connected with the third path of the third three-way valve (3) through the third valve (V3), the water side of the low temperature surface cooler, the fourth valve (V4) and the third valve (V3); The secondary network backwater respectively passes through the sixth three-way (6), the thirteenth way (10), the eighth three-way (8) and the twelfth valve (V12) into the evaporator side of the electric compression heat pump three, and then the evaporator side outlet of the electric compression heat pump three sequentially passes through the eleventh valve (V11), the seventh three-way (7), the ninth three-way (9) and the fifth three-way (5) to serve as the secondary network water supply, the secondary network water supply returns to the water side of the air-water heat exchanger through the eleventh three-way (11) and the eighth valve (V8); the third path of the fifth three-way (5) is connected with the third path of the sixth three-way (6) through the fifth valve (V5), the cooling tower, the sixth valve (V6), the circulating water pump; the third path of the eighth three-way (8) is connected with the third path of the seventh three-way (7) through the third two valve (V32), the secondary water inlet and outlet of the electric compression heat pump one and the third one valve (V31) in sequence; the third path of the thirteenth way (10) is connected with the third path of the ninth three-way (9) through the secondary water inlet and outlet of the electric compression heat pump two; the third path of the eleventh three-way (11) is connected with the third path of the twelfth three-way (12) through the tenth valve (V10), the electric ice maker and the ninth valve (V9), and the water flowing out of the water side of the air-water heat exchanger is combined with the water flowing out of the electric ice maker after passing through the seventh valve (V7), the twelfth three-way (12) and the circulating water pump to serve as the secondary network backwater.

2. The low-carbon mine cold and heat energy comprehensive utilization system according to claim 1, characterized in that, When the environment temperature is greater than 26℃, the electric compression heat pump one, the electric compression heat pump two and the ice storage tank are all opened, the secondary water inlet and outlet of the electric compression heat pump one is connected with the inlet and outlet of the condenser side of the electric compression heat pump one, the inlet and outlet of the evaporator side of the electric compression heat pump one is connected with the inlet and outlet of the water side of the normal temperature cooling radiator through the non-secondary water inlet and outlet of the electric compression heat pump one; the secondary water inlet and outlet of the electric compression heat pump two is connected with the inlet and outlet of the condenser side of the electric compression heat pump two, the inlet and outlet of the evaporator side of the electric compression heat pump two is connected with the inlet and outlet of the water side of the low temperature cooling radiator through the non-secondary water inlet and outlet of the electric compression heat pump two; the outdoor air first enters the gas side of the normal temperature cooling radiator to be cooled, then enters the gas side of the low temperature cooling radiator to be cooled again, then enters the gas side of the ultra-low temperature cooling radiator to be cooled for the third time, and finally is sent into the mine intake air shaft to make the underground air be treated for heat and humidity, and then is discharged into the atmosphere from the mine return air shaft; When the environment temperature is 15℃-26℃, the electric compression heat pump two is opened, the secondary water inlet and outlet of the electric compression heat pump two is connected with the inlet and outlet of the condenser side of the electric compression heat pump two, the inlet and outlet of the evaporator side of the electric compression heat pump two is connected with the inlet and outlet of the water side of the low temperature cooling radiator through the non-secondary water inlet and outlet of the electric compression heat pump two; the outdoor air directly enters the gas side of the low temperature cooling radiator to be cooled, then enters the ultra-low temperature cooling radiator to be cooled again, and finally is sent into the mine intake air shaft to make the underground air be treated for heat and humidity, and then is discharged into the atmosphere from the return air shaft; the condenser side of the electric compression heat pump two is cooled by the cooling tower, and the water side of the ultra-low temperature cooling radiator is cooled by the ice storage tank. When the ambient temperature is 5-15℃, the ultra-low temperature surface cooler is turned on, the outdoor air directly enters the gas side of the ultra-low temperature surface cooler for cooling, and is sent into the mine intake air shaft, and after the underground air is treated for heat and humidity, the air is discharged into the atmosphere from the return air shaft, and the ultra-low temperature surface cooler exchanges heat with the ice storage tank.

3. The low-carbon mine cold and heat energy comprehensive utilization system according to claim 1, characterized in that, When the ambient temperature is 2-5℃, the primary network return water is sequentially heated by the electric compression heat pump one, the electric compression heat pump two and the electric compression heat pump three, and then is provided as the primary network supply water; the secondary water inlet and outlet of the electric compression heat pump one is connected with the inlet and outlet of the evaporator side of the electric compression heat pump one, and the secondary water inlet and outlet of the electric compression heat pump two is connected with the inlet and outlet of the evaporator side of the electric compression heat pump two; the inlet and outlet of the condenser side of the electric compression heat pump one is communicated with the non-secondary water inlet and outlet of the electric compression heat pump one, and the inlet and outlet of the condenser side of the electric compression heat pump two is communicated with the non-secondary water inlet and outlet of the electric compression heat pump two; the outdoor air is directly sent into the mine intake air shaft, and after the underground air is treated for heat and humidity, the air enters the air-water heat exchanger for return air waste heat recovery; the secondary supply water from the outlets of the electric compression heat pump one, the electric compression heat pump two and the electric compression heat pump three is simultaneously sent into the water side of the air-water heat exchanger and the electric ice maker for heat absorption and temperature rise, the return air of the return air shaft is sent into the gas side of the air-water heat exchanger for heat release, and the ice made by the electric ice maker is stored in the ice storage tank; after the temperature rise, the secondary return water is combined and then is discharged into the electric compression heat pump one, the electric compression heat pump two and the electric compression heat pump three for heat release.

4. The low-carbon mine cold and heat energy comprehensive utilization system according to claim 1, characterized in that, When the ambient temperature is <2℃, the primary network return water is sequentially heated by the electric compression heat pump one, the electric compression heat pump two and the electric compression heat pump three, and then is provided as the primary network supply water; the secondary water inlet and outlet of the electric compression heat pump one is connected with the inlet and outlet of the evaporator side of the electric compression heat pump one, and the secondary water inlet and outlet of the electric compression heat pump two is connected with the inlet and outlet of the evaporator side of the electric compression heat pump two; the inlet and outlet of the condenser side of the electric compression heat pump two is communicated with the non-secondary water inlet and outlet of the electric compression heat pump two, and the inlet and outlet of the condenser side of the electric compression heat pump one is communicated with the non-secondary water inlet and outlet of the electric compression heat pump one; the outdoor air first enters the gas side of the normal temperature surface cooler for preheating, and then is sent into the mine intake air shaft for heat and humidity treatment of the underground air; the water side of the normal temperature surface cooler directly divides a heat exchange path from the primary network supply water and flows back to the primary network return water pipeline; the secondary supply water from the outlets of the electric compression heat pump one, the electric compression heat pump two and the electric compression heat pump three is simultaneously sent into the water side of the air-water heat exchanger and the electric ice maker for heat absorption and temperature rise, the return air of the return air shaft is sent into the gas side of the air-water heat exchanger for heat release, and the ice made by the electric ice maker is stored in the ice storage tank; after the temperature rise, the secondary return water is combined and then is discharged into the electric compression heat pump one, the electric compression heat pump two and the electric compression heat pump three for heat release.

5. The low-carbon mine cold and heat energy comprehensive utilization system according to claim 1, characterized in that, The tenth three-way valve (13) is installed on the pipeline between the sixteenth three-way valve (16) and the fifteenth valve (V15), the fourteenth three-way valve (14) is installed on the pipeline between the fifteenth three-way valve (15) and the fourteenth valve (V14), and the third way of the tenth three-way valve (13) is connected to the third way of the fourteenth three-way valve (14) through the nineteenth valve (V19), the heat storage pool, the twentieth valve (V20) and the fourteenth three-way valve (14); When the heat of the primary network water supply is in excess, the primary network water supply enters the upper part of the heat storage pool through the third way of the fourteenth three-way valve (14) and the twentieth valve (V20), and at the same time, the low-temperature water in the lower part of the heat storage pool flows out through the nineteenth valve (V19) and mixes with the primary network return water; When the heat of the primary network water supply is insufficient, the primary network return water enters the lower part of the heat storage pool through the third way of the tenth three-way valve (13) and the nineteenth valve (V19), and at the same time, the high-temperature water in the upper part of the heat storage pool flows out through the twentieth valve (V20) and mixes with the primary network water supply.

6. A low-carbon mine cold and heat energy comprehensive utilization system, characterized in that, The system comprises a primary network water supply, a primary network return water, a secondary network water supply, a secondary network return water, a tertiary network water supply, a tertiary network return water, a gas-water heat exchanger, a cooling tower, an electric compression heat pump one, an electric compression heat pump two, an electric compression heat pump three, an electric ice maker, an ice storage tank, a normal-temperature cooling device, a low-temperature cooling device and an ultralow-temperature cooling device, wherein the outdoor air pipe network is connected to the normal-temperature cooling device, the low-temperature cooling device and the ultralow-temperature cooling device, the normal-temperature cooling device, the low-temperature cooling device and the ultralow-temperature cooling device are connected in sequence and connected to a ventilation shaft; the mine fresh air is connected to a return air shaft after being heated by a mine underground ventilation system; the return air of the return air shaft is discharged into the atmosphere or directly discharged into the atmosphere; the ice storage tank is connected to the electric ice maker and the ultralow-temperature cooling device through a pipeline to form a loop; ​ The primary network return water passes through the thirteenth valve (V13), the sixteenth three-way valve (16), the tenth three-way valve (13) into the nineteenth three-way valve (19) in turn, and is divided into two paths, one of which passes through the fifteenth valve (V15), the first three-way valve (1), the non-secondary water inlet and outlet of the electric compression heat pump one, the circulating water pump, the second three-way valve (2), the sixteenth valve (V16), the third three-way valve (3), the condenser side of the electric compression heat pump two, the circulating water pump, the fourth three-way valve (4), the second three valve (V23) and the twenty-third valve (20) in turn; the other passes through the seventeenth valve (V17), the non-secondary water inlet and outlet of the electric compression heat pump three, the eighteenth valve (V18) and the twenty-third valve; the two paths are combined in the twenty-third valve (20), and then pass through the fifteenth three-way valve (15), the fourteenth three-way valve (14) and the fourteenth valve (V14) connected with the primary network water supply in turn; the third path of the fifteenth three-way valve (15) passes through the second one valve (V21), the seventeenth three-way valve (17), the water side of the normal temperature cooling coil, the eighteenth three-way valve (18), the second two valve (V22) and the third path of the sixteenth three-way valve (16), the third path of the seventeenth three-way valve (17) passes through the second valve (V2) and the third path of the second three-way valve (2), and the third path of the eighteenth three-way valve (18) passes through the first valve (V1) and the third path of the first three-way valve (1); the third path of the fourth three-way valve (4) passes through the third valve (V3), the water side of the low temperature cooling coil, the fourth valve (V4) and the third path of the third three-way valve (3); The secondary network return water passes through the sixth three-way valve (6), the thirteenth three-way valve (10), the eighth three-way valve (8) and the twelfth valve (V12) into the evaporator side of the electric compression heat pump three, and then the evaporator side outlet of the electric compression heat pump three passes through the eleventh valve (V11), the seventh three-way valve (7), the ninth three-way valve (9) and the fifth three-way valve (5) in turn to serve as the secondary network water supply, which returns to the water side of the air-water heat exchanger through the eleventh three-way valve (11) and the eighth valve (V8); the third path of the fifth three-way valve (5) passes through the fifth valve (V5), the cooling tower, the sixth valve (V6), the circulating water pump and the third path of the sixth three-way valve (6); the third path of the eighth three-way valve (8) passes through the third two valve (V32), the secondary water inlet and outlet of the electric compression heat pump one and the third one valve (V31) and the third path of the seventh three-way valve (7); the third path of the thirteenth three-way valve (10) passes through the secondary water inlet and outlet of the electric compression heat pump two and the third path of the ninth three-way valve (9); the third path of the eleventh three-way valve (11) passes through the tenth valve (V10), the electric ice maker, the ninth valve (V9) and the third path of the twelfth three-way valve (12); the water flowing out of the water side of the air-water heat exchanger passes through the seventh valve (V7), the twelfth three-way valve (12) and the circulating water pump and then is combined with the water flowing out of the electric ice maker to serve as the secondary network return water.

7. The low-carbon mine cold and heat energy comprehensive utilization system according to claim 6, characterized in that, When the ambient temperature is greater than 26℃, the electric compression heat pump one, the electric compression heat pump two and the ice storage tank are all opened, the secondary water inlet and outlet of the electric compression heat pump one is connected with the inlet and outlet of the condenser side of the electric compression heat pump one, the inlet and outlet of the evaporator side of the electric compression heat pump one is connected with the inlet and outlet of the water side of the normal temperature cooling panel through the non-secondary water inlet and outlet of the electric compression heat pump one; the secondary water inlet and outlet of the electric compression heat pump two is connected with the inlet and outlet of the condenser side of the electric compression heat pump two, the inlet and outlet of the evaporator side of the electric compression heat pump two is connected with the inlet and outlet of the water side of the low temperature cooling panel through the non-secondary water inlet and outlet of the electric compression heat pump two; the outdoor air first enters the gas side of the normal temperature cooling panel to be cooled, then enters the gas side of the low temperature cooling panel to be cooled again, then enters the gas side of the ultra-low temperature cooling panel to be cooled for the third time, and finally is sent into the mine intake air shaft, after the air underground is treated, is discharged into the atmosphere from the mine return air shaft; When the ambient temperature is 15℃-26℃, the electric compression heat pump two is opened, the secondary water inlet and outlet of the electric compression heat pump two is connected with the inlet and outlet of the condenser side of the electric compression heat pump two, the inlet and outlet of the evaporator side of the electric compression heat pump two is connected with the inlet and outlet of the water side of the low temperature cooling panel through the non-secondary water inlet and outlet of the electric compression heat pump two; the outdoor air directly enters the gas side of the low temperature cooling panel to be cooled, then enters the ultra-low temperature cooling panel to be cooled again, and finally is sent into the mine intake air shaft, after the air underground is treated, is discharged into the atmosphere from the return air shaft; the condenser side of the electric compression heat pump two is cooled by heat exchange through the cooling tower, and the water side of the ultra-low temperature cooling panel is cooled by heat exchange with the ice storage tank; When the ambient temperature is 5℃-15℃, the ultra-low temperature cooling panel is opened, the outdoor air directly enters the gas side of the ultra-low temperature cooling panel to be cooled, and is sent into the mine intake air shaft, after the air underground is treated, is discharged into the atmosphere from the return air shaft, and the ultra-low temperature cooling panel is cooled by heat exchange with the ice storage tank.

8. The low-carbon mine cold and heat energy comprehensive utilization system according to claim 6, characterized in that, When the ambient temperature is 2℃-5℃, the primary network return water is divided into two routes, one of which is sequentially heated by the electric compression heat pump one and the electric compression heat pump two, and the other is heated by the electric compression heat pump three, and the two routes provide primary network supply water after being heated and merged; the secondary water inlet and outlet of the electric compression heat pump one is connected with the inlet and outlet of the evaporator side of the electric compression heat pump one, and the secondary water inlet and outlet of the electric compression heat pump two is connected with the inlet and outlet of the evaporator side of the electric compression heat pump two; the inlet and outlet of the condenser side of the electric compression heat pump two is communicated with the non-secondary water inlet and outlet of the electric compression heat pump two, and the inlet and outlet of the condenser side of the electric compression heat pump one is communicated with the non-secondary water inlet and outlet of the electric compression heat pump one; the outdoor air is directly sent into the mine air inlet, and after the underground air is treated by heat and humidity, the return air enters the air-water heat exchanger to recover the waste heat of the return air; the secondary supply water from the outlets of the electric compression heat pump one, the electric compression heat pump two and the electric compression heat pump three is simultaneously sent into the water side of the air-water heat exchanger and the electric ice maker to absorb heat and be heated, the return air of the return air well is sent into the gas side of the air-water heat exchanger to release heat, and the ice made by the electric ice maker is stored in the ice storage tank; after being heated, the secondary return water is merged and then enters the electric compression heat pump one, the electric compression heat pump two and the electric compression heat pump three to release heat.

9. The low-carbon mine cold and heat energy comprehensive utilization system according to claim 6, characterized in that, When the ambient temperature is <2℃, the primary network return water is divided into two routes, one of which is sequentially heated by the electric compression heat pump one and the electric compression heat pump two, and the other is heated by the electric compression heat pump three, and the two routes provide primary network supply water after being heated and merged; the secondary water inlet and outlet of the electric compression heat pump one is connected with the inlet and outlet of the evaporator side of the electric compression heat pump one, and the secondary water inlet and outlet of the electric compression heat pump two is connected with the inlet and outlet of the evaporator side of the electric compression heat pump two; the inlet and outlet of the condenser side of the electric compression heat pump two is communicated with the non-secondary water inlet and outlet of the electric compression heat pump two, and the inlet and outlet of the condenser side of the electric compression heat pump one is communicated with the non-secondary water inlet and outlet of the electric compression heat pump one; the outdoor air is first sent into the gas side of the normal temperature air cooler to be preheated, and then sent into the mine air inlet, and after the underground air is treated by heat and humidity, the return air enters the air-water heat exchanger to recover the waste heat of the return air; the water side of the normal temperature air cooler directly divides a route from the primary network supply water for heat exchange, and flows back to the primary network return water pipeline; the secondary supply water from the outlets of the electric compression heat pump one, the electric compression heat pump two and the electric compression heat pump three is simultaneously sent into the water side of the air-water heat exchanger and the electric ice maker to absorb heat and be heated, the return air of the return air well is sent into the gas side of the air-water heat exchanger to release heat, and the ice made by the electric ice maker is stored in the ice storage tank; after being heated, the secondary return water is merged and then enters the electric compression heat pump one, the electric compression heat pump two and the electric compression heat pump three to release heat.

10. The low-carbon mine cold and heat energy comprehensive utilization system according to claim 6, characterized in that, The tenth three-way valve (13) is installed on the pipeline between the sixteenth three-way valve (16) and the nineteenth three-way valve (19), and the fourteenth three-way valve (14) is installed on the pipeline between the fifteenth three-way valve (15) and the fourteenth valve (V14), and the third way of the tenth three-way valve (13) is connected with the third way of the fourteenth three-way valve (14) through the nineteenth valve (V19), the heat storage pool, the twentieth valve (V20) and the fourteenth three-way valve (14); When the heat of the primary network water supply is in excess, the primary network water supply enters the upper part of the heat storage pool through the third way of the fourteenth three-way valve (14) and the twentieth valve (V20), and at the same time, the low-temperature water in the lower part of the heat storage pool flows out through the nineteenth valve (V19) and mixes with the primary network return water; When the heat of the primary network water supply is insufficient, the primary network return water enters the lower part of the heat storage pool through the third way of the tenth three-way valve (13) and the nineteenth valve (V19), and at the same time, the high-temperature water in the upper part of the heat storage pool flows out through the twentieth valve (V20) and mixes with the primary network water supply.

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