Design method of mine heat supply system coupled with new energy

Abstract

The application discloses a kind of mine heating system design methods of coupling new energy, step 1, partition item hour-by-hour prediction analysis mine heat load;Step 2, assesses mine regional heat source resource condition;Step 3, calculates the available heat source supply of mine;Step 4, mine heating system source load partition matching response;Step 5, system capacity configuration and optimization.The present application is around the new problem of the diversification of heating heat source after the elimination of small coal-fired boiler house in mine, based on mine industrial waste heat, coupling new energy as regulating heat source, external electric energy as emergency, and the system configuration is optimized by combining entropy method.

Description

Technical Field

[0001] This invention belongs to the field of coal mine heating technology and relates to a design method for a mine heating system coupled with new energy sources. Background Technology

[0002] Most mines are located in remote areas far from industrial parks or urban areas, making centralized heating difficult to cover. Therefore, they often rely on self-built coal-fired boiler rooms to meet their heating needs. Icing on the walls of vertical shafts and on the roads of inclined shafts poses a serious threat to equipment and personnel safety; therefore, mine heating is a crucial aspect of ensuring safe production in mines. Mine heat loads are relatively small, with some mines having coal-fired boiler capacities below 20 t / h. In recent years, with the closure of small coal-fired boilers and the advancement of "dual-carbon" goals, the heating gap after the elimination of coal-fired boiler rooms in mines will be difficult to fill. Meanwhile, mining areas have a large amount of idle coal mining subsidence areas and other land resources. The state has encouraged the construction of photovoltaic and wind power in mining areas, creating conditions for new energy sources to participate in mine heating and representing a crucial route to solving the problem of insufficient heat sources in mines in the future. Currently, there are no design methods or standards for the coupling of new energy sources into mine heating systems. Summary of the Invention

[0003] The purpose of this invention is to provide a design method for a mine heating system that couples with new energy sources, thereby solving the problem of insufficient personnel for mine heating.

[0004] The technical solution adopted in this invention is a design method for a mine heating system coupled with new energy sources, which is implemented according to the following steps:

[0005] Step 1: Hourly Prediction and Analysis of Mine Heat Load by Region and Item: After considering system heat loss and margin coefficient, the hourly simulation calculation of shaft antifreeze heat load Q1, building heat load Q2, domestic bathing heat load Q3 and total mine heat load Q is performed by region to obtain the hourly curve of the mine's annual heat load.

[0006] Step 2: Assess the heat source resources in the mine area: Assess the solar and wind resources in the area where the mine is located to determine whether the mine is suitable for co-firing new energy heating. If so, continue with the next steps; otherwise, the mine heating system cannot be coupled with new energy.

[0007] Step 3: Calculate the available heat source supply in the mine: Based on the mine heat source resource assessment results, calculate the maximum supply of usable heat source resources, including the mine's industrial waste heat P1 and solar thermal energy. Photovoltaic power generation E1 and wind power generation ;

[0008] Step 4, Source-Load Zoning Matching Response of Mine Heating System: In accordance with the design principles of "time-sharing and dynamic balance" and the design concept of "mine industrial waste heat as the basic heat source, coupled with new energy as the regulating heat source, and external power as the emergency heat source", the mine heating terminals are divided into different areas according to the spatial distance. Then, according to the heat source distribution in the area, the heat supply is increased in the order of industrial waste heat, new energy, and external power grid until it matches the total heat load of the mine in the area. The overall balance of the mine heating cycle is formed based on the heat balance of each area.

[0009] Step 5, System Capacity Configuration and Optimization: Based on the source-load zoning matching response results, various system configuration schemes are obtained by adjusting variables, including heat source type, heat supply ratio of each heat source, and operation strategy. Carbon emission intensity, comprehensive energy efficiency, equipment utilization rate, and investment are used as indicators to calculate the weight of each indicator using the entropy method. The scheme with the highest comprehensive evaluation value among the various system configuration schemes is selected as the final scheme.

[0010] The invention is further characterized in that,

[0011] Step 1 calculates the wellbore antifreeze heat load Q1, building heat load Q2, domestic and bathing heat load Q3, and the total mine heat load Q as follows:

[0012] (1)

[0013] In equation (1), Let be the total heat load at time t, in kW; The total heat load margin factor that takes into account system heat loss;

[0014] (2)

[0015] In equation (2), Let t be the wellbore antifreeze heat load, in kW; The air intake volume at the wellhead is in m³ / s; The density of air at 2°C under local atmospheric pressure, in kg / m³; The specific heat at constant pressure of air at 2°C under local atmospheric pressure, in kJ / (kg·°C); Let t be the local ambient temperature, in °C.

[0016] (3)

[0017] In equation (3), Let t be the building heat load, in kW. This is the building heat load margin coefficient; Let be the heat index per unit volume of the i-th building, W / (m³·℃); Let the volume of the i-th building be m³; Let be the indoor design temperature of the i-th building, in °C;

[0018] (4)

[0019] In equation (4), Let t be the domestic and bathing heat load, in kW; This refers to the heat load margin coefficient for domestic bathing and showering. Water consumption per shower, in m³; To raise the temperature of the bathing water; The duration of heating bath water for a single bath, in hours.

[0020] Step 2 is as follows:

[0021] The assessment of solar and wind resource endowment conditions in the area where the mine is located is divided into solar resource assessment and wind resource assessment. According to the "Solar Resource Assessment Method" GB / T 37526-2019, if the solar resource level reaches C or above, and the mine has idle rooftops and subsidence area land, then it is suitable for photovoltaic power generation. According to the "Wind Farm Wind Energy Resource Assessment Method" GB / T 18710-2002, if the wind resource level reaches 3 or above, and the surface subsidence of the construction area is less than the allowable value of foundation deformation specified in the "Code for Design of Foundation of Wind Turbine Units for Onshore Wind Farm Projects", then it is suitable for wind power generation. If the area where the mine is located is suitable for photovoltaic power generation or wind power generation, or both, then mine-coupled new energy heating can be carried out.

[0022] Step 3 calculates the waste heat P1 from the mine's industrial processes, photovoltaic power generation E1, and wind power generation. Specifically:

[0023] (5)

[0024] In equation (5), Available supply of mine water and waste heat from mine return air, in kW; Available heat supply capacity for waste heat from mine air compressors, kW; The available waste heat supply capacity of the gas generator set, in kW;

[0025] (6)

[0026] In equation (6), Specific heat capacity of the working fluid on the evaporator side of the heat pump, kJ / (kg·℃); The working fluid mass flow rate on the evaporator side of the heat pump is kg / s; The temperature drop of the working fluid on the evaporator side of the heat pump is measured in °C. The heat pump efficiency ratio;

[0027] (7)

[0028] In equation (7), This refers to the number of air compressors in the mine. The power of a single mine air compressor is expressed in kW. The heat conversion rate of the air compressor;

[0029] (8)

[0030] In equation (8), The lower heating value of wet gas is kJ / m³. The volumetric flow rate of wet gas is m³ / s; Thermal efficiency of gas generator;

[0031] (9)

[0032] In equation (9), The total solar irradiance on a horizontal surface is expressed in kW·h / m². For component installation capacity, kWp; Irradiance under standard conditions; This is the overall efficiency coefficient;

[0033] (10)

[0034] In equation (10), This refers to the number of wind turbine generator sets. The cut-in wind speed for the wind turbine generator, in m / s; Cut-off wind speed for wind turbine generator, m / s; For the i-th wind turbine generator at wind speed Power generation capacity at that time, in MW; Let be the probability distribution of wind speed at the hub height of the i-th wind turbine.

[0035] Step 4 includes heating terminals for mine shaft antifreeze, heating terminals for buildings, and heating terminals for domestic bathing.

[0036] In step 4, the heat supply is increased sequentially according to the distribution of heat sources in the region, following the order of industrial waste heat, new energy sources, and secondary sources of the external power grid. Specifically, the industrial waste heat from the mine is used as the initial source of heat supply in the region. If the total heat supply in the region matches the total heat load of the mine, the source-load zoning matching response result is determined. If they do not match, heat is supplied by converting solar heat collection, photovoltaic power generation, and wind power generation to increase the heat supply. If the total heat supply in the region matches the total heat load of the mine, the source-load zoning matching response result is determined. If they do not match, heat is supplied by the external power grid to increase the heat supply until it matches the total heat load of the mine in the region, and the source-load zoning matching response result is determined.

[0037] When using new energy sources for heating, solar collectors generate heat per day. Priority will be given to meeting the daily heat requirements for daily bathing and washing. Solar collector design area Calculate using the following formula:

[0038] (11)

[0039] In equation (11), Waste heat power of air compressor, kW; The daily operating time of the air compressor, in hours (h). The average daily solar irradiance on the solar collector's light-receiving surface in December, in MJ / (m²). 2 ·d); The average thermal efficiency of the collector is based on the total area.

[0040] like Smaller than the maximum arable area of ​​the mine factory roof If the design meets the requirements, then the maximum arable area of ​​the mine factory roof shall be used; otherwise, the design shall be based on the maximum arable area of ​​the mine factory roof. Calculate Daily calorie requirement for bathing The shortfall will be supplemented by photovoltaic and wind power.

[0041] The mine's heating terminals are designed with thermal storage devices. During the non-heating season and the heating season when no renewable energy supplementation is needed, all the electricity generated by photovoltaic and wind power is used for the mine's electrical equipment. During the heating season, photovoltaic and wind power participate in heating as a supplement. The electricity generated by photovoltaic and wind power is converted into heat energy through electric boilers and thermal storage devices. The thermal storage system has a capacity of E. s for:

[0042] (12)

[0043] In equation (12), Let t be the total heat load of the mine at time t, in kW; The maximum heat power that can be provided for industrial waste heat in mines, in kW; The last occurrence of the period preceding the peak of the mine's annual heat load. = The moment, h; This is the first occurrence within a period following the peak of the mine's annual heat load. = The moment, h;

[0044] Using historical local meteorological data from the mine as input data, The average daily photovoltaic power generation during the heating season was simulated using PVsyst design software, resulting in a photovoltaic installed capacity of [missing value]. MW, similarly, combined with the location of the wind farm in the mining area and meteorological data, to By calculating the average daily wind power generation during the heating season, the installed capacity of wind turbine generators can be derived. MW,

[0045] (13)

[0046] In equation (13), The heat storage is generated from the photovoltaic power generation process, in MJ. The heat storage is generated from the heat of wind power generation, MJ; For electric boiler efficiency; Efficiency of thermal storage devices.

[0047] The beneficial effects of this invention are:

[0048] This invention presents a design method for a mine heating system coupled with new energy sources. Addressing the shortcomings of existing mine heating system designs that do not incorporate new energy heating, this invention proposes a design method for a mine heating system coupled with new energy sources. Based on the operating characteristics of new energy sources and fully considering the special characteristics of mine production and domestic heat consumption, this invention addresses the new problem of diversified heat sources after the elimination of small coal-fired boiler rooms in mines. It uses waste heat from mine industrial processes as a foundation, coupled with new energy sources as a regulating heat source, external electrical energy as an emergency source, and optimizes the system configuration using the entropy method. Attached Figure Description

[0049] Figure 1 This is a flowchart of a design method for a mine heating system coupled with new energy sources according to the present invention. Detailed Implementation

[0050] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0051] This invention provides a design method for a mine heating system coupled with new energy sources, such as... Figure 1 As shown, the specific steps are as follows:

[0052] Step 1: Hourly Prediction and Analysis of Mine Heat Load by Region and Item: After considering system heat loss and margin coefficient, the hourly simulation calculation of shaft antifreeze heat load Q1, building heat load Q2, domestic bathing heat load Q3 and total mine heat load Q is performed by region to obtain the hourly curve of the mine's annual heat load.

[0053] The specific calculations for the wellbore antifreeze heat load Q1, building heat load Q2, domestic and bathing heat load Q3, and total mine heat load Q are as follows:

[0054] (1)

[0055] In equation (1), Let be the total heat load at time t, in kW; To account for the total heat load margin factor of the system heat loss, The value is 1.05~1.1;

[0056] (2)

[0057] In equation (2), Let t be the wellbore antifreeze heat load, in kW; The air intake volume at the wellhead is in m³ / s; The density of air at 2°C under local atmospheric pressure, in kg / m³; The specific heat at constant pressure of air at 2°C under local atmospheric pressure, in kJ / (kg·°C); Let t be the local ambient temperature, in °C.

[0058] (3)

[0059] In equation (3), Let t be the building heat load, in kW. This is the building heat load margin factor. It is 1.05; Let be the heat index per unit volume of the i-th building, W / (m³·℃); Let the volume of the i-th building be m³; Let be the indoor design temperature of the i-th building, in °C;

[0060] (4)

[0061] In equation (4), Let t be the domestic and bathing heat load, in kW; This is the heat load margin coefficient for domestic bathing. It is 1.05; Water consumption per shower, in m³; To raise the temperature of the bathing water; The duration of heating bath water for a single session, in hours;

[0062] When forecasting mine heat load by region and item, hourly, local meteorological data can be imported into the TRNSYS software. The equation module in TRNSYS can be used to establish the mine shaft antifreeze heat load separately. Building heat load Domestic bathing heat load and total heat load of the mine Mathematical models are used to generate annual data through software simulation and analysis.

[0063] Step 2: Assess the heat source resources in the mine area: Assess the solar and wind resources in the area where the mine is located to determine whether the mine is suitable for co-firing new energy heating. If so, continue with the next steps; otherwise, the mine heating system cannot be coupled with new energy.

[0064] Step 2 is as follows:

[0065] The assessment of solar and wind resource endowment conditions in the area where the mine is located is mainly divided into solar resource assessment and wind resource assessment. According to the "Solar Resource Assessment Method" GB / T 37526-2019, if the solar resource level reaches C or above, and the mine has idle rooftops and subsidence area land, then it is suitable for photovoltaic power generation. According to the "Wind Farm Wind Energy Resource Assessment Method" GB / T 18710-2002, if the wind resource level reaches 3 or above, and the surface subsidence of the construction area is less than the allowable value of foundation deformation specified in the "Code for Design of Wind Turbine Foundations of Onshore Wind Farm Projects", then it is suitable for wind power generation. If the area where the mine is located is suitable for photovoltaic power generation or wind power generation, or both, then mine-coupled new energy heating can be carried out.

[0066] Step 3: Calculate the available heat source supply in the mine: Based on the mine heat source resource assessment results, calculate the maximum supply of usable heat source resources, including the mine's industrial waste heat P1 and solar thermal energy. Photovoltaic power generation E1 and wind power generation ;

[0067] Waste heat in mining operations is associated energy generated during the mining process. It includes heat from mine return air, mine drainage, the heat generated during the operation of mine air compressors, and the heat generated by mine gas through gas generators. Waste heat from mine water and mine return air is mainly recovered through heat pumps, while waste heat from mine air compressors and gas generator sets is recovered and utilized through heat exchangers.

[0068] Calculate the waste heat P1 from the mine's industrial processes, photovoltaic power generation E1, and wind power generation. Specifically:

[0069] (5)

[0070] In equation (5), Available supply of mine water and waste heat from mine return air, in kW; Available heat supply capacity for waste heat from mine air compressors, kW; The available waste heat supply capacity of the gas generator set, in kW;

[0071] (6)

[0072] In equation (6), Specific heat capacity of the working fluid on the evaporator side of the heat pump, kJ / (kg·℃); The working fluid mass flow rate on the evaporator side of the heat pump is kg / s; The temperature drop of the working fluid on the evaporator side of the heat pump is measured in °C. The heat pump efficiency ratio;

[0073] (7)

[0074] In equation (7), This refers to the number of air compressors in the mine. The power of a single mine air compressor is expressed in kW. The thermal conversion efficiency of an air compressor is related to its heat loss and average load rate, and is typically between 60% and 85%.

[0075] (8)

[0076] In equation (8), The lower heating value of wet gas is kJ / m³. The volumetric flow rate of wet gas is m³ / s; For gas generator sets with internal combustion engines, thermal efficiency can be improved by adding a waste heat boiler and recovering waste heat from the generator set's circulating cooling water. It can reach around 45%;

[0077] (9)

[0078] In equation (9), The total solar irradiance on a horizontal surface is expressed in kW·h / m². For component installation capacity, kWp; Irradiance under standard conditions; This is the overall efficiency coefficient;

[0079] (10)

[0080] In equation (10), This refers to the number of wind turbine generator sets. The cut-in wind speed for the wind turbine generator, in m / s; Cut-off wind speed for wind turbine generator, m / s; For the i-th wind turbine generator at wind speed Power generation capacity at that time, in MW; Let be the probability distribution of wind speed at the hub height of the i-th wind turbine.

[0081] Step 4: Source-Load Zoning Matching Response of Mine Heating System: Due to the unique nature of mine production processes, some mine heat sources and heat loads are spatially dispersed, resulting in unique spatiotemporal matching characteristics. Mine heat load fluctuates with ambient temperature, being lower at the beginning and end of the heating season and higher in the middle, and lower during the day and higher at night. Some mine heat sources are located far apart (e.g., the distance between ventilation shafts and industrial areas in some mines is more than 10km), and different heat sources are also spatially dispersed (e.g., some mine return air shafts are not located on industrial sites, and air compressors are located near return air shafts but not on industrial sites).

[0082] Mine heating system source-load zone matching response: In accordance with the design principles of "time-sharing and zoned, dynamic balance" and the design concept of "mine industrial waste heat as the basic heat source, coupled with new energy as the regulating heat source, and external power as the emergency heat source", the mine heating terminals are divided into different areas according to the distance between them. The mine heating terminals include shaft antifreeze heating terminals, building heating terminals, and domestic bathing heating terminals. Then, according to the heat source distribution in the area, the heating supply is increased in the order of secondary heat source, industrial waste heat, new energy, and external power grid until it matches the total heat load of the mine in the area. The overall balance of the mine heating cycle is formed based on the heat balance of each area.

[0083] If the intake air temperature at the mine shaft is below 2°C, ice will form on the shaft wall, posing a serious threat to hoisting equipment and personnel. In fact, ice may fall and cause serious safety accidents. Therefore, it is necessary to introduce external power as an emergency heat source to ensure that the entire heating system has sufficient backup and adjustment means under any working conditions.

[0084] Based on the distribution of heat sources within the region, the heating supply is increased sequentially in the order of industrial waste heat, new energy sources, and the secondary source of the external power grid. Specifically, the industrial waste heat from the mine is used as the initial source of heating within the region. If the total heating supply within the region matches the total heat load of the mine, the source-load matching response result for that region is determined. If they do not match, heat is supplied through solar energy collection, photovoltaic power generation, and wind power generation. If the total heating supply within the region matches the total heat load of the mine, the source-load matching response result for that region is determined. If they do not match, heat is supplied through the external power grid until the total heat load of the mine within the region is matched, and the source-load matching response result for that region is determined.

[0085] When using new energy sources for heating, solar collectors generate heat per day. Priority will be given to meeting the daily heat requirements for daily bathing and washing. Solar collector design area Calculate using the following formula:

[0086] (11)

[0087] In equation (11), Waste heat power of air compressor, kW; The daily operating time of the air compressor, in hours (h). The average daily solar irradiance on the solar collector's light-receiving surface in December, in MJ / (m²). 2 ·d); The average thermal efficiency of the collector is based on the total area.

[0088] like Smaller than the maximum arable area of ​​the mine factory roof If the design meets the requirements, then the maximum arable area of ​​the mine factory roof shall be used; otherwise, the design shall be based on the maximum arable area of ​​the mine factory roof. Calculate Daily calorie requirement for bathing The shortfall will be supplemented by photovoltaic and wind power.

[0089] The mine's heating terminals are designed with thermal storage devices. During the non-heating season and the heating season when no renewable energy supplementation is needed, all the electricity generated by photovoltaic and wind power is used for the mine's electrical equipment. During the heating season, photovoltaic and wind power participate in heating as a supplement. The electricity generated by photovoltaic and wind power is converted into heat energy through electric boilers and thermal storage devices. The thermal storage system has a capacity of E. s for:

[0090] (12)

[0091] In equation (12), Let t be the total heat load of the mine at time t, in kW; The maximum heat power that can be provided for industrial waste heat in mines, in kW; The last occurrence of the period preceding the peak of the mine's annual heat load. = The moment, h; This is the first occurrence within a period following the peak of the mine's annual heat load. = The moment, h;

[0092] Using historical local meteorological data from the mine as input data, The average daily photovoltaic power generation during the heating season was simulated using PVsyst design software, resulting in a photovoltaic installed capacity of [missing value]. MW, similarly, combined with the location of the wind farm in the mining area and meteorological data, to By calculating the average daily wind power generation during the heating season, the installed capacity of wind turbine generators can be derived. MW,

[0093] (13)

[0094] In equation (13), The heat storage is generated from the photovoltaic power generation process, in MJ. The heat storage is generated from the heat of wind power generation, MJ; For electric boiler efficiency; Efficiency of thermal storage devices.

[0095] Step 5, System Capacity Configuration and Optimization: Based on the source-load zoning matching response results, various system configuration schemes are obtained by adjusting variables, including heat source type, heat supply ratio of each heat source, and operation strategy. Carbon emission intensity, comprehensive energy efficiency, equipment utilization rate, and investment are used as indicators to calculate the weight of each indicator using the entropy method. The scheme with the highest comprehensive evaluation value among the various system configuration schemes is selected as the final scheme.

Claims

1. A design method for a mine heating system coupled with new energy sources, characterized in that, The specific steps are as follows: Step 1: Hourly Prediction and Analysis of Mine Heat Load by Region and Item: After considering system heat loss and margin coefficient, the hourly simulation calculation of shaft antifreeze heat load Q1, building heat load Q2, domestic bathing heat load Q3 and total mine heat load Q is performed by region to obtain the hourly curve of the mine's annual heat load. Step 2: Assess the heat source resources in the mine area: Assess the solar and wind resources in the area where the mine is located to determine whether the mine is suitable for co-firing new energy heating. If so, continue with the next steps; otherwise, the mine heating system cannot be coupled with new energy. Step 3: Calculate the available heat source supply in the mine: Based on the mine heat source resource assessment results, calculate the maximum supply of usable heat source resources, including the mine's industrial waste heat P1 and solar thermal energy. Photovoltaic power generation E1 and wind power generation ; Step 4, Source-Load Zoning Matching Response of Mine Heating System: In accordance with the design principles of "time-sharing and dynamic balance" and the design concept of "mine industrial waste heat as the basic heat source, coupled with new energy as the regulating heat source, and external power as the emergency heat source", the mine heating terminals are divided into different areas according to the distance between them. Then, according to the distribution of heat sources in the area, the heat supply is increased in the order of industrial waste heat, new energy, and external power grid until it matches the total heat load of the mine in the area. The overall balance of the mine heating cycle is formed based on the heat balance of each area. Step 5, System Capacity Configuration and Optimization: Based on the source-load partitioning and matching response results, multiple system configuration schemes are obtained by adjusting variables, including heat source type, heat supply ratio of each heat source, and operating strategy. Carbon emission intensity, comprehensive energy efficiency, equipment utilization rate, and investment are used as indicators to calculate the weight of each indicator using the entropy method. The scheme with the highest comprehensive evaluation value among the multiple system configuration schemes is selected as the final scheme.

2. The design method for a mine heating system coupled with new energy sources according to claim 1, characterized in that, Step 1, which calculates the wellbore antifreeze heat load Q1, building heat load Q2, domestic and bathing heat load Q3, and total mine heat load Q, is as follows: （1） In equation (1), Let be the total heat load at time t, in kW; The total heat load margin factor that takes into account system heat loss; （2） In equation (2), Let t be the wellbore antifreeze heat load, in kW; The air intake volume at the wellhead is in m³ / s; The density of air at 2°C under local atmospheric pressure, in kg / m³; The specific heat at constant pressure of air at 2°C under local atmospheric pressure, in kJ / (kg·°C); Let t be the local ambient temperature, in °C. （3） In equation (3), Let t be the building heat load, in kW. This is the building heat load margin coefficient; Let be the heat index per unit volume of the i-th building, W / (m³·℃); Let the volume of the i-th building be m³; Let be the indoor design temperature of the i-th building, in °C; （4） In equation (4), Let t be the domestic and bathing heat load, in kW; This refers to the heat load margin coefficient for domestic bathing and showering. Water consumption per shower, in m³; To raise the temperature of the bathing water; The duration of heating bath water for a single bath, in hours.

3. The design method for a mine heating system coupled with new energy sources according to claim 1, characterized in that, Step 2 specifically involves: The assessment of solar and wind resource endowment conditions in the area where the mine is located is divided into solar resource assessment and wind resource assessment. According to the "Solar Resource Assessment Method" GB / T 37526-2019, if the solar resource level reaches C or above, and the mine has idle rooftops and subsidence area land, then it is suitable for photovoltaic power generation. According to the "Wind Farm Wind Energy Resource Assessment Method" GB / T18710-2002, if the wind resource level reaches 3 or above, and the surface subsidence of the construction area is less than the allowable foundation deformation value specified in the "Code for Design of Wind Turbine Foundations of Onshore Wind Farm Projects", then it is suitable for wind power generation. If the area where the mine is located is suitable for photovoltaic power generation or wind power generation, or both, then mine-coupled new energy heating can be carried out.

4. The design method for a mine heating system coupled with new energy sources according to claim 1, characterized in that, In step 3, the waste heat P1 of the mine industry, the photovoltaic power generation E1, and the wind power generation are calculated. Specifically: （5） In equation (5), Available supply of mine water and waste heat from mine return air, in kW; Available heat supply capacity for waste heat from mine air compressors, kW; The available waste heat supply capacity of the gas generator set, in kW; （6） In equation (6), Specific heat capacity of the working fluid on the evaporator side of the heat pump, kJ / (kg·℃); The working fluid mass flow rate on the evaporator side of the heat pump is kg / s; The temperature drop of the working fluid on the evaporator side of the heat pump is measured in °C. The heat pump efficiency ratio; （7） In equation (7), This refers to the number of air compressors in the mine. The power of a single mine air compressor is expressed in kW. The heat conversion rate of the air compressor; （8） In equation (8), The lower heating value of wet gas is kJ / m³. The volumetric flow rate of wet gas is m³ / s; Thermal efficiency of gas generator; （9） In equation (9), The total solar irradiance on a horizontal surface is expressed in kW·h / m². For component installation capacity, kWp; Irradiance under standard conditions; This is the overall efficiency coefficient; （10） In equation (10), This refers to the number of wind turbine generator sets. The cut-in wind speed for the wind turbine generator, in m / s; Cut-off wind speed for wind turbine generator, m / s; For the i-th wind turbine generator at wind speed Power generation capacity at that time, in MW; Let be the probability distribution of wind speed at the hub height of the i-th wind turbine.

5. The design method for a mine heating system coupled with new energy sources according to claim 1, characterized in that, The mine heating terminals in step 4 include heating terminals for shaft antifreeze, heating terminals for buildings, and heating terminals for domestic bathing.

6. The design method for a mine heating system coupled with new energy sources according to claim 5, characterized in that, In step 4, the heating supply is increased sequentially according to the distribution of heat sources in the region, following the order of industrial waste heat, new energy sources, and the secondary heat supply from the external power grid. Specifically, the industrial waste heat from the mine is used as the initial heating supply in the region. If the total heating supply in the region matches the total heat load of the mine, the source-load zoning matching response result is determined. If they do not match, heat is supplied by converting solar heat collection, photovoltaic power generation, and wind power generation to increase the heating supply. If the total heating supply in the region matches the total heat load of the mine, the source-load zoning matching response result is determined. If they do not match, heat is supplied by the external power grid to increase the heating supply until it matches the total heat load of the mine in the region, and the source-load zoning matching response result is determined.

7. The design method for a mine heating system coupled with new energy sources according to claim 1, characterized in that, When using new energy sources for heating, solar collectors generate heat per day. Priority will be given to meeting the daily heat requirements for daily bathing and washing. Solar collector design area Calculate using the following formula: （11） In equation (11), Waste heat power of air compressor, kW; The daily operating time of the air compressor, in hours (h). The average daily solar irradiance on the solar collector's light-receiving surface in December, in MJ / (m²). 2 ·d); The average thermal efficiency of the collector is based on the total area. like Smaller than the maximum arable area of ​​the mine factory roof If the design meets the requirements, then the maximum arable area of ​​the mine factory roof shall be used; otherwise, the design shall be based on the maximum arable area of ​​the mine factory roof. Calculate Daily calorie requirement for bathing The shortfall will be supplemented by photovoltaic and wind power.

8. The design method for a mine heating system coupled with new energy sources according to claim 1, characterized in that, The mine heating terminal is designed with a thermal storage device. During the non-heating season and the heating season when no new energy supplementation is required, all the electricity generated by the photovoltaic and wind power plants is used for the consumption of mine electrical equipment. During the heating season, photovoltaic and wind power participate in heating as a supplement. The electricity generated by the photovoltaic and wind power plants is converted into heat energy through electric boilers and thermal storage devices. The thermal storage system has a capacity of E. s for: （12） In equation (12), Let t be the total heat load of the mine at time t, in kW; The maximum heat power that can be provided for industrial waste heat in mines, in kW; The last occurrence of the period preceding the peak of the mine's annual heat load. = The moment, h; This is the first occurrence within a period following the peak of the mine's annual heat load. = The moment, h; Using historical local meteorological data from the mine as input data, The average daily photovoltaic power generation during the heating season was simulated using PVsyst design software, resulting in a photovoltaic installed capacity of [missing value]. MW, similarly, combined with the location of the wind farm in the mining area and meteorological data, to By calculating the average daily wind power generation during the heating season, the installed capacity of wind turbine generators can be derived. MW, （13） In equation (13), The heat storage is generated from the photovoltaic power generation process, in MJ. The heat storage is generated from the heat of wind power generation, MJ; For electric boiler efficiency; Efficiency of thermal storage devices.

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