Collaborative economic operation method for thermal energy station based on comprehensive utilization of coal mine waste heat

Abstract

The invention discloses a thermal energy station collaborative economic operation method based on coal mine waste heat comprehensive utilization. The method comprises the steps that a heat load calculation model and an extractable waste heat calculation model are built based on a coal mine waste heat comprehensive utilization system; constructing a constraint relation between the heat supply network part and the heat utilization network part; and a coal mine waste heat comprehensive utilization optimization operation objective function is constructed, calculation solving is carried out, and the minimum energy consumption cost is obtained. According to the system, the lowest interactive energy consumption cost of a thermal energy station I and a thermal energy station II of a heat supply network part is taken as a target, the mine derived energy waste heat is recycled and comprehensively utilized, and the mode of combining the mine derived energy waste heat with electricity is adopted to replace traditional fire coal and fuel gas heat supply, so that on one hand, the coal mine energy resource utilization efficiency can be improved, and on the other hand, the energy consumption is reduced; on the other hand, mine energy can be cleaner and more economical, and theoretical basis and data support can be provided for efficient and economical production and operation of coal mine energy stations.

Description

Technical Field

[0001] The present invention relates to an energy balance operation method, specifically a collaborative economic operation method of a thermal energy station based on the comprehensive utilization of coal mine waste heat, and belongs to the technical field of comprehensive energy utilization. Background Art

[0002] China is rich in coal resources, and coal is one of the main energy sources in China. According to the 2021 National Economic and Social Development Statistical Bulletin of China, the coal consumption in China accounts for 56% of the total energy consumption. Coal mining includes multiple links such as excavation, transportation, drainage, and ventilation. The industry has characteristics such as high energy consumption, high energy consumption costs, and strong dependence on fossil energy. How to achieve energy-saving and economic production in coal mines is an issue of concern in the industry.

[0003] The exhausted air and mine water generated in coal mine production contain a large amount of waste heat, which can be used as low-quality heat sources. Based on the heating system, power supply link, heat consumption system, and heat consumption load, through an economic energy scheduling strategy, the derivative energy of coal mines can be fully utilized, which can not only improve the utilization efficiency of derivative energy, meet the heat demand of coal mines, but also reduce the dependence on external energy, reduce the energy consumption cost of coal mine production, and enhance the stability and reliability of energy supply. However, on the one hand, there is currently a lack of efficient recovery and utilization means for the waste heat generated in coal mine production, and the waste heat is often directly discharged into the environment, which not only causes a huge waste of energy, but also has negative impacts such as heat pollution on the surrounding ecological environment; on the other hand, the traditional coal mine energy supply often relies on the external power grid and a single heat source, and the power supply and heating system lack flexibility and coordination, and the cost of purchasing electricity and gas has become an important part of the production cost of coal mines. Summary of the Invention

[0004] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a collaborative economic operation method of a thermal energy station based on the comprehensive utilization of coal mine waste heat, which can realize the efficient comprehensive utilization of the waste heat of coal mine exhausted air and mine water and the collaborative economic operation with the thermal energy station, thereby improving the economy of coal mine energy operation, and can provide a theoretical basis and data support for the interconnected, efficient, and economic production operation of coal mine energy stations.

[0005] To achieve the above object, the comprehensive utilization system of coal mine waste heat includes a heating network part, a heat-using network part and a coal mine power distribution line part; the heating network part includes a thermal energy station I and a thermal energy station II. Both the thermal energy station I and the thermal energy station II include coal mine-derived energy waste heat utilization equipment, an electric boiler and a heat storage tank. The coal mine-derived energy waste heat utilization equipment includes exhausted air waste heat utilization equipment and water inrush waste heat utilization equipment. The exhausted air waste heat utilization equipment, the water inrush waste heat utilization equipment, the electric boiler and the heat storage tank are respectively connected to the heat supply and return water pipelines of the heat network through the heating supply and return water pipelines. The thermal energy station I and the thermal energy station II are connected through the heat supply and return water pipelines of the heat network, and a heat exchanger is provided between the thermal energy station I and the thermal energy station II; the heat-using network part includes coal mine heat-using load equipment, and the coal mine heat-using load equipment at least includes shaft anti-freezing heat load equipment, building heating heat load equipment and bathing heat load equipment. The coal mine heat-using load equipment is respectively connected to the heat supply and return water pipelines of the heat network through the heat-using supply and return water pipelines; the coal mine power distribution line part is electrically connected to an external power grid and a photovoltaic power generation device, and the coal mine power distribution line part is also electrically connected to the coal mine-derived energy waste heat comprehensive utilization equipment and the electric boiler through a power supply link;

[0006] The collaborative economic operation method of the thermal energy station based on the comprehensive utilization of coal mine waste heat specifically includes the following steps:

[0007] Step1. Based on the comprehensive utilization system of coal mine waste heat, a heat-using load calculation model is constructed. The heat-using load calculation model at least includes a shaft anti-freezing heat load calculation model, a building heating heat load calculation model and a bathing heat load calculation model;

[0008] Step2. Based on the comprehensive utilization system of coal mine waste heat, a calculable waste heat quantity calculation model is constructed. The calculable waste heat quantity calculation model includes an exhausted air waste heat calculable waste heat quantity calculation model and a water inrush waste heat calculable waste heat quantity calculation model;

[0009] Step3. Based on the heat-using load calculation model and the calculable waste heat quantity calculation model, the constraint relationship between the heating network part and the heat-using network part is constructed;

[0010] Step4. Construct an optimized operation objective function for the comprehensive utilization of coal mine waste heat, and perform calculation and solution to obtain the minimum energy consumption cost;

[0011] Combined with time-of-use electricity price and photovoltaic electricity price, with the lowest interactive energy consumption cost between the thermal energy station I and the thermal energy station II as the goal, the optimized operation objective function for the comprehensive utilization of coal mine waste heat is constructed as follows:

[0012] C=c buy P buy +c PV P PV

[0013] Pbuy +P PV =P VAM +P GW +P EB

[0014] Q var +Q wt +Q bo +Q x,out =Q1+Q2+Q3+Q x,in

[0015] Where: C is the electricity cost of heating in the heating network; c buy is the unit cost of purchasing electricity from the grid; c PV is the unit cost of purchased photovoltaic power generation; P buy P is the amount of electricity purchased from the power grid; PV P is the purchased photovoltaic power; VAM , P GW , P EB They are respectively the power consumption of the exhaust air waste heat utilization equipment, the power consumption of the gushing water waste heat utilization equipment, and the power consumption of the electric boiler; Q var Q is the heat generated by the exhaust air waste heat utilization equipment; wt Q is the heat generated by the water waste heat utilization equipment; bo is the heat output of the electric boiler; Q x,out and Q x,in They are the heat released and stored in the heat storage tank respectively; Q1 is the antifreeze heat load of the shaft; Q2 is the building heating heat load; Q3 is the bathing hot water heating load.

[0016] Furthermore, in Step 1, the calculation model for the wellbore antifreeze heat load is expressed as follows:

[0017] Q1=K1C a Gρ a (T h -T w )

[0018] Where: Q1 is the heat load for antifreeze of the wellbore; K1 is the surplus coefficient; C a is the specific heat capacity of air at constant pressure; G is the air intake volume of the mine; ρ a is the average density of air; T h is the temperature after cold and hot air are mixed; T w It is the average of the local extreme minimum temperature over the years;

[0019] For the building heating heat load, the calculation model is expressed as follows:

[0020] Q2=K2VΔT

[0021] Where: Q2 is the building heating load; K2 is the volumetric heat index; V is the sum of the volumes of the heated buildings; ΔT is the temperature difference between indoors and outdoors;

[0022] For the heat load of bathing, the calculation model is expressed as follows:

[0023]

[0024] Where: Q3 is the heating load for bathing hot water; K3 is the redundancy coefficient; ρ w is the density of water; G r is the bathing water supply flow rate; C w is the specific heat capacity of water; T o is the outlet water temperature after heating; T i is the inlet water temperature for heating; h is the operating time of the heating unit.

[0025] Furthermore, in Step 2, for the waste heat in the exhausted air, the calculation model of the extractable waste heat quantity is expressed as follows:

[0026]

[0027] Where: Q gly is the extractable waste heat quantity from the mine exhausted air; T gi and T go are the inlet and outlet temperatures of the ethylene glycol solution respectively; α gly is the heat transfer coefficient of the ethylene glycol shell-and-tube heat exchanger; A gly is the surface area of the ethylene glycol shell-and-tube heat exchanger; T vi and T vo are the inlet and outlet temperatures of the exhausted air respectively;

[0028] For the waste heat in the inflowing water, the calculation model of the extractable waste heat quantity is expressed as follows:

[0029] Q GW =(1 - η GW )m GW C GW (T wi - T wo )

[0030] Where: Q GW is the extractable waste heat quantity from the mine inflowing water; η GW is the heat loss coefficient after the inflowing water is purified; m GW is the mass flow rate of the inflowing water; C GW is the specific heat capacity of the inflowing water; T wi and T wo are the inlet and outlet temperatures of the inflowing water respectively.

[0031] Furthermore, in Step 3, the constraint relationships between the heat supply network part and the heat consumption network part include the following constraints:

[0032] ① The continuity constraint relationship of the water flow is expressed as follows:

[0033]

[0034] In the formula: and are respectively the pipeline sets starting from and ending at node n; and are respectively the mass flow rates of pipeline λ in the water supply and return water systems at time t; and are respectively the sets of heat exchange stations and heat collection points connected to node n; is the mass flow rate of heat collection point a at time t; is the mass flow rate of heat exchange station b at time t;

[0035] ② After the water flows of each pipeline flow into the same node, the calculation method of the mixed water temperature is expressed as follows:

[0036]

[0037] In the formula: and are respectively the outlet water temperatures of pipeline λ in the water supply system and the return water system at time t; and are respectively the water temperatures of node n after the water flows in the water supply system and the return water system are mixed at time t;

[0038] ③ The mixed water temperature is the same as the water temperature of the water flowing into the pipeline starting from this node, which is expressed as follows:

[0039]

[0040] In the formula: and are respectively the outlet water temperatures of pipeline λ in the water supply system and the return water system at time t;

[0041] ④ Heat loss is caused by heat exchange between hot water and the outside world during transmission, which is expressed as follows:

[0042]

[0043] In the formula: is the temperature of the external environment at time t; θ λ is the heat transfer coefficient of pipeline λ; L λ is the length of pipeline λ; C w is the specific heat capacity of water.

[0044] Further, in Step 4, the Gurobi solver is used for calculation and solution.

[0045] Compared with the prior art, the collaborative economic operation method of the thermal energy station based on the comprehensive utilization of coal mine waste heat combines the heat load calculation model of the coal mine and the calculable waste heat quantity calculation model, can realize the efficient comprehensive utilization of the low-quality heat source in the coal mine, combines the time-of-use electricity price and the photovoltaic electricity price, and aims at the lowest interactive energy consumption cost of Thermal Energy Station I and Thermal Energy Station II in the heating network part, and can obtain the output of the waste heat utilization equipment and the electric boiler, the flexible charging and discharging plan of the heat storage tank, and the electricity purchase demand. By recovering and comprehensively utilizing the waste heat of the mine-derived energy, and adopting the method of combining the mine-derived energy waste heat and electricity consumption to replace the traditional coal and gas heating, on the one hand, it can improve the utilization efficiency of coal mine energy resources and reduce the external dependence on energy, and on the other hand, it can make the mine energy consumption cleaner and more economical, and can provide theoretical basis and data support for the interconnected, efficient and economic production operation of the coal mine energy station. Description of the Drawings

[0046] Figure 1 is the architecture diagram of the coal mine waste heat comprehensive utilization system of the present invention, where 1 to 16 represent the system nodes on the hot water supply and return pipelines of the heating network;

[0047] Figure 2 is the diagram of the heating equipment and interactive heat power of Thermal Energy Station I in the embodiment of the present invention;

[0048] Figure 3 is the diagram of the total externally purchased electric power of Thermal Energy Station I and Thermal Energy Station II in the embodiment of the present invention;

[0049] Figure 4 is the diagram of the water temperature change of the system node in the embodiment of the present invention. Detailed Embodiment

[0050] The present invention will be further described below with reference to the drawings and embodiments.

[0051] The architecture diagram of the coal mine waste heat comprehensive utilization system is as Figure 1As shown in the figure, it includes a heat supply network part, a heat consumption network part, and a coal mine power distribution line part; the heat supply network part includes Thermal Energy Station I and Thermal Energy Station II. Both Thermal Energy Station I and Thermal Energy Station II include coal mine-derived energy waste heat utilization equipment, electric boilers, and heat storage tanks. The coal mine-derived energy waste heat utilization equipment includes exhaust air waste heat utilization equipment and water inrush waste heat utilization equipment. The exhaust air waste heat utilization equipment, water inrush waste heat utilization equipment, electric boilers, and heat storage tanks are respectively connected to the heat network supply and return water pipelines through the heat supply and return water pipelines. Thermal Energy Station I and Thermal Energy Station II are connected through the heat network supply and return water pipelines, and a heat exchange station is provided between Thermal Energy Station I and Thermal Energy Station II, which can realize the heat energy interaction between Thermal Energy Station I and Thermal Energy Station II; the heat consumption network part includes coal mine heat consumption load equipment, which can include shaft anti-freezing heat load equipment, building heating heat load equipment, process heat load equipment, coal washery heating heat load equipment, and bathing heat load equipment. The coal mine heat consumption load equipment is respectively connected to the heat network supply and return water pipelines through the heat consumption supply and return water pipelines. The hot water provided by the heat supply network part can be transported to each coal mine heat consumption load equipment through the supply pipeline of the heat network supply and return water pipelines. The low-temperature return water after heat exchange of each coal mine heat consumption load can be returned to the heat supply network part through the return pipeline of the heat network supply and return water pipelines. The heat energy released by the waste heat utilization equipment, electric boilers, and heat storage tanks can heat the low-temperature return water returned by the return pipeline, and the heated softened water is then transported to each coal mine heat consumption load equipment through the supply pipeline; the coal mine power distribution line part is electrically connected to the external power grid and photovoltaic power generation equipment, and the coal mine power distribution line part is also electrically connected to the coal mine-derived energy waste heat comprehensive utilization equipment and electric boilers through the power supply link.

[0052] The exhaust air waste heat utilization equipment can include a mine ventilator, an ethylene glycol heat exchanger, and a return air source heat pump. The mine exhaust air can be introduced into the ethylene glycol heat exchanger through a diversion air duct, exchanged heat with the ethylene glycol circulating solution, and then discharged. The heated ethylene glycol solution enters the return air source heat pump unit as the circulating medium on the heat source side of the heat pump and transfers the heat to the softened water on the heat supply side; the water inrush waste heat utilization equipment can include a mine water purification treatment pool, a plate heat exchanger, and a water source heat pump. The circulating submersible sewage pump can transport the purified mine water inrush to the plate heat exchanger and transfer the heat to the softened water on the heat supply side.

[0053] When the waste heat of the derived energy cannot meet the heat load demand, the electric boiler can convert electrical energy into heat energy to supplement the heat load gap.

[0054] The heat storage tank can store the waste heat of the derived energy that cannot be consumed in real time, or store the heat energy generated by the electric boiler when the time-of-use electricity price is low, and release the heat energy when the heat load demand is high.

[0055] The specific steps of the collaborative economic operation method of the thermal energy station based on the comprehensive utilization of coal mine waste heat are as follows:

[0056] Step1. Based on the comprehensive utilization system of coal mine waste heat, construct a heat load calculation model.

[0057] The heat load calculation model includes at least a heat load calculation model for shaft freeze protection, a heat load calculation model for building heating, and a heat load calculation model for bathing.

[0058] For the heat load of shaft freeze protection, the calculation model is expressed as follows:

[0059] Q1 = K1C a Gρ a (T h -T w )

[0060] Where: Q1 is the heat load of shaft freeze protection; K1 is the safety factor; C a is the specific heat capacity of air at constant pressure; G is the intake air volume of the mine; ρ a is the average density of air; T h is the temperature after mixing of cold and hot air; T w is the average value of the extreme minimum temperature over the years in the local area.

[0061] For the heat load of building heating, the calculation model is expressed as follows:

[0062] Q2 = K2VΔT

[0063] Where: Q2 is the heat load of building heating; K2 is the volume heat index; V is the sum of the volumes of the heating buildings; ΔT is the temperature difference between indoors and outdoors.

[0064] For the heat load of bathing, the calculation model is expressed as follows:

[0065]

[0066] Where: Q3 is the heating load of bathing hot water; K3 is the redundancy factor; ρ w is the density of water; G r is the bathing water supply flow rate; C w is the specific heat capacity of water; T o is the outlet water temperature after heating; T i is the inlet water temperature for heating; h is the operating time of the heating unit.

[0067] Step2. Based on the comprehensive utilization system of coal mine waste heat, construct a calculable waste heat quantity model.

[0068] The calculable waste heat quantity model includes a calculable waste heat quantity model for exhaust air waste heat and a calculable waste heat quantity model for water inrush waste heat.

[0069] For exhaust air waste heat, the calculable waste heat quantity model is expressed as follows:

[0070]

[0071] Where: Q gly is the recoverable waste heat of mine ventilation air; T gi and T go are the inlet and outlet temperatures of the ethylene glycol solution respectively; α gly is the heat transfer coefficient of the ethylene glycol shell-and-tube heat exchanger; A gly is the surface area of the ethylene glycol shell-and-tube heat exchanger; T vi and T vo are the inlet and outlet temperatures of the ventilation air respectively.

[0072] For the heat of the gushing water, the calculation model of the recoverable waste heat is expressed as follows:

[0073] Q GW =(1 - η GW )m GW C GW (T wi - T wo )

[0074] Where: Q GW is the recoverable waste heat of the mine gushing water; η GW is the heat loss coefficient after the gushing water is purified; m GW is the mass flow rate of the gushing water; C GW is the specific heat capacity of the gushing water; T wi and T wo are the inlet and outlet temperatures of the gushing water respectively.

[0075] Step3. Based on the heat load calculation model and the recoverable waste heat calculation model, construct the constraint relationships between the heat supply network part and the heat consumption network part.

[0076] ① The continuity constraint relationship of the water flow is expressed as follows:

[0077]

[0078] Where: and are the pipe sets starting from and ending at node n respectively; and are the mass flow rates of the pipe λ in the water supply and return systems at time t respectively; and are the sets of heat exchange stations and heat collection points connected to node n respectively; is the mass flow rate of the heat collection point a at time t; is the mass flow rate of the heat exchange station b at time t.

[0079] ② After the water flows of each pipeline flow into the same node, the calculation method of the mixed water temperature is shown as follows:

[0080]

[0081] In the formula: and are the outlet water temperatures of the pipelines λ of the water supply system and the return water system at time t respectively; and are the water temperatures of node n after the water flows of the water supply system and the return water system are mixed at time t respectively.

[0082] ③ The mixed water temperature is the same as the water temperature of the water flowing into the pipeline starting from this node, which is shown as follows:

[0083]

[0084] In the formula: and are the outlet water temperatures of the pipelines λ of the water supply system and the return water system at time t respectively.

[0085] ④ Heat loss is caused by heat exchange between hot water and the outside world during the transmission process, which is shown as follows:

[0086]

[0087] In the formula: is the temperature of the external environment at time t; θ λ is the heat transfer coefficient of pipeline θ; L λ is the length of pipeline λ; C w is the specific heat capacity of water.

[0088] Step4. Construct the optimization operation objective function of the comprehensive utilization of coal mine waste heat, and perform calculation and solution to obtain the minimum energy consumption cost.

[0089] Combined with the time-of-use electricity price and the photovoltaic electricity price, with the lowest interactive energy consumption cost of Thermal Energy Station I and Thermal Energy Station II as the goal, obtain the output of the waste heat utilization equipment and the electric boiler, the flexible charging and discharging plan of the heat storage tank, and the electricity purchase demand, and set the optimization operation objective function of the comprehensive utilization of coal mine waste heat as follows:

[0090] C = c buy P buy + c PV P PV

[0091] P buy + P PV = P VAM + P GW + P EB

[0092] Q var +Q wt +Q bo +Q x,out = Q1 + Q2 + Q3 + Q x,in

[0093] Where: C is the heating power consumption cost of the heating network part; c buy is the unit cost of purchasing electricity from the power grid; c PV is the unit cost of purchasing externally generated photovoltaic power; P buy is the electricity quantity purchased from the power grid; P PV is the externally purchased photovoltaic electricity quantity; P VAM , P GW , P EB are respectively the electricity consumption powers of the exhausted air waste heat utilization equipment, the gushing water waste heat utilization equipment, and the electric boiler; Q var is the heat output of the exhausted air waste heat utilization equipment; Q wt is the heat output of the gushing water waste heat utilization equipment; Q bo is the heat output of the electric boiler; Q x,out and Q x,in are respectively the heat released and stored by the heat storage tank.

[0094] To verify the effectiveness of the collaborative economic operation method of the thermal energy station based on the comprehensive utilization of coal mine waste heat, simulations were carried out with the operation data of a coal mine in Shanxi as a reference. The MATLAB_R2021b was used to call the Gurobi10.0.1 solver for simulation and solution. After scheduling, the heating equipment and interactive thermal power of Thermal Energy Station I are as Figure 2 shown, the total externally purchased electric power of Thermal Energy Station I and Thermal Energy Station II after scheduling is as Figure 3 shown, the change in the water temperature at the system node is as Figure 4 shown, and the comparison of the heating cost after adopting this method with the heating costs of traditional coal-fired and gas-fired heating is shown in Table 1 below.

[0095] Table 1 Comparison of heating costs

[0096]

[0097] It can be seen that the collaborative economic operation method of the thermal energy station based on the comprehensive utilization of coal mine waste heat recovers and comprehensively utilizes the waste heat of mine-derived energy, and replaces traditional coal-fired and gas-fired heating through the combination of waste heat and electricity consumption. On the one hand, it can improve the utilization efficiency of coal mine energy resources and reduce the external dependence on energy. On the other hand, it can make the energy use in the mine cleaner and more economical, and can provide a theoretical basis and data support for the interconnected, efficient, and economic production operation of the coal mine energy station.

Claims

1. A collaborative economic operation method for a thermal energy station based on the comprehensive utilization of coal mine waste heat, characterized in that, The coal mine waste heat comprehensive utilization system includes a heating network part, a heat-using network part, and a coal mine power distribution line part; the heating network part includes Thermal Energy Station I and Thermal Energy Station II. Both Thermal Energy Station I and Thermal Energy Station II include coal mine-derived energy waste heat utilization equipment, electric boilers, and heat storage tanks. The coal mine-derived energy waste heat utilization equipment includes exhausted air waste heat utilization equipment and water inrush waste heat utilization equipment. The exhausted air waste heat utilization equipment, water inrush waste heat utilization equipment, electric boilers, and heat storage tanks are respectively connected to the heat network supply and return water pipelines through heating supply and return water pipelines. Thermal Energy Station I and Thermal Energy Station II are connected through the heat network supply and return water pipelines, and a heat exchange station is provided between Thermal Energy Station I and Thermal Energy Station II; the heat-using network part includes coal mine heat-using load equipment, and the coal mine heat-using load equipment at least includes shaft anti-freezing heat load equipment, building heating heat load equipment, and bathing heat load equipment. The coal mine heat-using load equipment is respectively connected to the heat network supply and return water pipelines through heat-using supply and return water pipelines; the coal mine power distribution line part is electrically connected to the external power grid and photovoltaic power generation equipment, and the coal mine power distribution line part is also electrically connected to the coal mine-derived energy waste heat comprehensive utilization equipment and electric boilers through the power supply link; The collaborative economic operation method of the thermal energy station based on the comprehensive utilization of coal mine waste heat specifically includes the following steps: Step1. Based on the coal mine waste heat comprehensive utilization system, construct a heat-using load calculation model, and the heat-using load calculation model at least includes a shaft anti-freezing heat load calculation model, a building heating heat load calculation model, and a bathing heat load calculation model; Step2. Based on the coal mine waste heat comprehensive utilization system, construct an extractable waste heat quantity calculation model, and the extractable waste heat quantity calculation model includes an extractable waste heat quantity calculation model for exhausted air waste heat and an extractable waste heat quantity calculation model for water inrush waste heat; Step3. Based on the heat-using load calculation model and the extractable waste heat quantity calculation model, construct the constraint relationship between the heating network part and the heat-using network part; Step4. Construct an optimization operation objective function for the comprehensive utilization of coal mine waste heat, and perform calculation and solution to obtain the minimum energy consumption cost; Combined with time-of-use electricity price and photovoltaic electricity price, with the lowest interactive energy consumption cost between Thermal Energy Station I and Thermal Energy Station II as the goal, the optimization operation objective function for the comprehensive utilization of coal mine waste heat is constructed as follows: C = c buy P buy + c PV P PV P buy +P PV =P VAM +P GW +P EB Q var +Q wt +Q bo +Q x,out = Q1 + Q2 + Q3 + Q x,in Where: C is the electricity cost for partial heat supply in the heat supply network; c buy is the unit cost of purchasing electricity from the power grid; c PV is the unit cost of purchasing externally sourced photovoltaic power generation; P buy is the electricity quantity purchased from the power grid; P PV is the externally sourced photovoltaic electricity quantity; P VAM 、P GW 、P EB are respectively the electricity consumption powers of the exhausted air waste heat utilization equipment, the gushing water waste heat utilization equipment, and the electric boiler; Q var is the heat output of the exhausted air waste heat utilization equipment; Q wt is the heat output of the gushing water waste heat utilization equipment; Q bo is the heat output of the electric boiler; Q x,out and Q x,in are respectively the heat released and stored by the heat storage tank; Q1 is the heat load for shaft anti-freezing; Q2 is the heat load for building heating; Q3 is the heat load for heating bath water.

2. The collaborative economic operation method of the thermal energy station based on the comprehensive utilization of coal mine waste heat according to claim 1, wherein, In Step1, For the shaft anti-freezing heat load, the calculation model is expressed as follows: Q1 = K1C a Gρ a (T h -T w ) Where: Q1 is the heat load for antifreeze of the wellbore; K1 is the surplus coefficient; C a is the specific heat capacity of air at constant pressure; G is the air intake volume of the mine; ρ a is the average density of air; T h is the temperature after cold and hot air are mixed; T w It is the average of the local extreme minimum temperature over the years; For the building heating heat load, the calculation model is expressed as follows: Q2 = K2VΔT In the formula: Q2 is the building heating heat load; K2 is the volume heat index; V is the sum of the volumes of the heating buildings; ΔT is the temperature difference between indoors and outdoors; For the bathing heat load, the calculation model is expressed as follows: Where: Q3 is the heating load of bath hot water; K3 is the redundancy coefficient; ρ w is the density of water; G r is the bath water supply flow rate; C w is the specific heat capacity of water; T o is the outlet water temperature after heating; T i is the inlet water temperature for heating; h is the operation time of the heating unit.

3. The collaborative economic operation method of the thermal energy station based on the comprehensive utilization of coal mine waste heat according to claim 1, characterized in that, In Step2, For the exhausted air waste heat, the extractable waste heat quantity calculation model is expressed as follows: Where: Q gly is the recoverable waste heat of mine ventilation air; T gi and T go are the inlet and outlet temperatures of the ethylene glycol solution respectively; α gly is the heat transfer coefficient of the ethylene glycol shell-and-tube heat exchanger; A gly is the surface area of the ethylene glycol shell-and-tube heat exchanger; T vi and T vo are the inlet and outlet temperatures of the ventilation air respectively. For the water inrush waste heat, the extractable waste heat quantity calculation model is expressed as follows: Q GW =(1 - η GW )m GW C GW (T wi - T wo ) Where: Q GW is the recoverable waste heat of mine water inflow; η GW is the heat loss coefficient after the water inflow is purified; m GW is the mass flow rate of the water inflow; C GW is the specific heat capacity of the water inflow; T wi and T wo are the temperatures at the inlet and outlet of the water inflow, respectively.

4. The collaborative economic operation method of the thermal energy station based on the comprehensive utilization of coal mine waste heat according to claim 1, characterized in that, In Step3, the constraint relationship between the heating network part and the heat-using network part includes the following constraints: ① The continuity constraint relationship of the water flow is expressed as follows: Wherein: and are respectively the pipeline sets starting from node n and ending at node n; and are respectively the mass flow rates of pipeline λ in the water supply and return water systems at time t; and are respectively the heat exchange stations and heat collection point sets connected to node n; is the mass flow rate of heat collection point a at time t; is the mass flow rate of heat exchange station b at time t; ② After the water flows of each pipeline flow into the same node, the calculation method of the mixed water temperature is expressed as follows: Wherein: and are respectively the outlet water temperatures of the water supply system and the return water system pipelines λ at time t; and are respectively the water temperatures at node n after the water flows in the water supply system and the return water system are mixed at time t; ③ The mixed water temperature is the same as the water temperature of the water flowing into the pipeline with this node as the head, which is expressed as follows: Where: and are the outlet water temperatures of the water supply system and the return water system pipelines λ at time t, respectively; ④ Heat loss occurs due to heat exchange between the hot water and the outside during the transmission process, which is expressed as follows: Where: is the temperature of the external environment at time t; θ λ is the heat conduction coefficient of pipeline λ; L λ is the length of pipeline λ; C w is the specific heat capacity of water.

5. The collaborative economic operation method of a thermal energy station based on comprehensive utilization of coal mine waste heat according to claim 1, characterized in that, In Step 4, the Gurobi solver is used for calculation and solution.

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