CN116641834B - Geothermal utilization and pumping and accumulating power generation system based on mine water burst circulation - Google Patents
Geothermal utilization and pumping and accumulating power generation system based on mine water burst circulation Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 260
- 238000005086 pumping Methods 0.000 title claims abstract description 48
- 238000010248 power generation Methods 0.000 title claims abstract description 47
- 239000003245 coal Substances 0.000 claims abstract description 29
- 238000005065 mining Methods 0.000 claims abstract description 25
- 239000002918 waste heat Substances 0.000 claims abstract description 20
- 238000005381 potential energy Methods 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 238000004064 recycling Methods 0.000 claims abstract description 6
- 230000008595 infiltration Effects 0.000 claims abstract description 5
- 238000001764 infiltration Methods 0.000 claims abstract description 5
- 238000011010 flushing procedure Methods 0.000 claims description 39
- 230000005611 electricity Effects 0.000 claims description 15
- 238000004146 energy storage Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005485 electric heating Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 238000005338 heat storage Methods 0.000 claims description 3
- 230000007774 longterm Effects 0.000 claims description 3
- 238000012946 outsourcing Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
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- 230000026280 response to electrical stimulus Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 3
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- 230000000295 complement effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K21/00—Steam engine plants not otherwise provided for
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a geothermal utilization and pumping-accumulating power generation system based on mine water burst circulation, which comprises an underground water burst water bin pumping-discharging part, a water burst waste heat utilization part, a water burst recharging potential energy power generation part and a water resource infiltration recycling part. The geothermal utilization and pumping and accumulating power generation system based on mine water inflow circulation can meet water inflow safety discharge requirements, and through a flexible water inflow pumping and discharging utilization mode of real-time response to electricity price change, not only are full utilization of water inflow waste heat resources and water outflow economical dispatching realized, but also clean power sources can be formed by utilizing water inflow recharging potential energy to generate power, and geothermal resources are fully absorbed by water inflow recycling to form rich hot water, so that integration and utilization of water inflow resources in and after mining can be realized, not only can safe pumping and discharging requirements of water inflow of a coal mine be met, but also full utilization of the rich hot water inflow resources and underground space after mining can be realized, accompanying resource waste under the coal mine safety production requirements can be reduced, and conversion utilization efficiency of energy resources can be improved.
Description
Technical Field
The invention relates to a mine geothermal utilization system, in particular to a geothermal utilization and pumping and accumulating power generation system based on mine water inflow circulation, and belongs to the technical field of mine energy low-carbon production.
Background
The coal resources of China are rich, the coal is one of main energy sources of China, and according to the national economy and social development statistical publication of China 2021, the coal consumption of China accounts for 56% of the total energy consumption. Coal mining belongs to the high-energy-consumption industry, and how to realize energy-saving and economic production of coal mines is a concern in the industry.
Because the temperature is low in winter in northern areas of China, the mine area air inlet well mouth needs to be heated for freezing prevention, and the measure ensures the normal operation of a fan and the relatively proper working environment of underground personnel. The existing mining area heat extraction mode is mostly met through a coal-fired boiler, a gas-fired boiler or an electric boiler, the coal-fired boiler has the problems of low heat efficiency, direct pollutant emission, resource waste and the like, the coal-fired boiler is gradually replaced by the gas-fired boiler or the electric boiler, but the gas-fired boiler has the problems of high emission of nitrogen oxides, high operation cost and the like, and the electric boiler is relatively safe to operate, but is limited by coal mine capacitance and has higher operation cost, so that the technical scheme of carrying out mining area heat extraction by utilizing mine geothermal resources occurs in the prior art, such as using a heat pump technology to utilize waste heat in coal mine ventilation air or coal mine water burst, but has the problem of high heat source transportation energy consumption.
At present, coal mining in China still takes underground mining as the main part, the ratio of an underground coal mine with an underground type is more than 88%, a huge goaf is usually formed after underground mining is completed, and the goaf is usually filled to reduce the damage to the surface environment, but the filled goaf not only consumes large energy, but also causes the waste of underground space resources, so that the technical scheme of recycling materials stored in the goaf appears in the prior art, such as the underground water storage space is formed by reconstructing the goaf after filling and plugging the water-guiding fracture zone for a water-deficient mining area, and the operation of filling and plugging the water-guiding fracture zone for overlying rocks is complicated.
At present, china is still in a classification exploration stage in the aspects of development and utilization of coal mine derived energy and underground space resources, and lacks technical means and energy scheduling schemes of multi-energy complementary mode joint development and comprehensive utilization of mine waste heat resources, underground space energy storage, geothermal resources and the like.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a geothermal utilization and pumping and accumulating power generation system based on mine water burst circulation, which can realize comprehensive utilization of mine water burst resources, mine underground waste heat resources, post-mining underground space and geothermal resources and achieve the purposes of multi-energy complementation, combined development and comprehensive utilization.
The geothermal utilization and pumping and accumulating power generation system based on mine water burst circulation comprises an underground water burst water bin pumping and discharging part, a water burst waste heat utilization part, a water burst recharging potential energy power generation part and a water resource infiltration recycling part;
The underground water flushing sump pumping and draining part comprises a water flushing sump and a water flushing and draining unit which are positioned under the mine, the underground drainage tank is connected with the water flushing sump through a variable-speed pumped storage unit, and the water flushing sump is connected with the pumping channel through the water flushing and draining unit;
The water inflow waste heat utilization part comprises a water source heat pump unit, and a heat exchange water inlet port of the water source heat pump unit is connected with the output end of the extraction channel;
The water-flushing recharging potential energy power generation part comprises a ground surface reservoir, a recharging channel and a hydroelectric generating set, wherein the water-supplementing input end of the ground surface reservoir is connected with the heat exchange water outlet port of the water source heat pump unit, the water-draining end of the ground surface reservoir is connected with the input end of the recharging channel, and the water turbine of the hydroelectric generating set is arranged in the recharging channel;
The water resource infiltration-back circulation part comprises a mining working face reservoir arranged in a goaf above the water flushing sump, the drainage end of the recharge channel is connected with the mining working face reservoir, and rock stratum cracks are formed between the mining working face reservoir and the water flushing sump;
Geothermal utilization and pumping and accumulating power generation system based on mine water burst circulation specifically comprises the following steps:
a. Mine water burst lifting: the method comprises the steps that hot water oozing out from a stratum aquifer in the mine exploitation process is collected to a water-gushing water bin along an underground drainage groove, the drainage flow of a water-gushing water drainage unit is set according to the water-gushing amount on the basis of meeting the capacity safety margin of the water-gushing water bin, and the water-gushing water drainage unit is started to lift mine water gushing with waste heat resources to the ground in response to real-time electricity price;
b. And (3) utilizing water burst waste heat: after mine water is lifted to the ground, heat exchange is carried out on geothermal resources drawn in the water and a heat exchange medium through a water-gushing water source heat pump unit, and meanwhile, the real-time purchase heat cost and the purchase electricity cost are considered, and the heat load requirement is jointly supplied by the water source heat pump unit through electric heating and external purchase heat energy;
c. and (3) water flooding recharging potential energy power generation: the water after heat exchange is conveyed to a surface reservoir, a drainage end of the surface reservoir is opened on the basis of meeting the safety margin of the surface reservoir capacity, the water of the surface reservoir is returned to a working face reservoir in a mining space through a recharging channel, and potential energy of the recharging water is converted into electric energy by a hydroelectric generating set during the recharging process;
d. And (5) rewet heat storage: the reservoir of the working face is used as a long-term water storage space, geothermal resources are absorbed by the reinjection water in the process of seeping back to the water flushing sump through the rock stratum fissure so as to form a part of the heat-enriched water flushing, and the cyclic utilization of the water flushing is realized.
The water surge sump model is
Wherein V is the capacity of the water sump, unit: m 3; q is the normal water inflow, unit: m 3/h;VK is the empty capacity of the water sump, unit: m 3;
The model of the water gushing and draining unit is
Wherein W G is the running flow of the drainage unit, and the unit is: m 3/h;PG is the running power of the drainage unit, and the unit is: kW; p is the specific gravity of the medium, and water is 1000kg/m 3; g is gravity acceleration, 9.8N/kg is taken; h G is the lift of the drainage unit, and the unit is: m; η G is the running efficiency of the drainage unit.
The water surge scheduling constraint is that
Vt+1＝Vt+Qt-Wt
Wherein V t is the water inflow in the sump at time t; q t is the water gushing quantity at the moment t; w t is the water inflow amount extracted by the drainage unit at the moment t;
the output constraint of the variable-speed pumped storage unit is
Wherein: the power generation and pumping power of the variable-speed pumping energy storage unit j in the period t are respectively as follows: kW; /(I) The minimum and the maximum power generation and pumping power of the variable-speed pumping energy storage unit j are respectively as follows: kW;
equivalent power generation capacity of the surface reservoir
Wherein: η j is the pumping energy storage efficiency of the variable-speed pumping energy storage unit j, and the value is 75%; j is the total number of variable-speed pumped storage units;
The earth surface reservoir can generate electricity to be constrained as
Emin≤Et≤Emax
Wherein: e min、Emax is the minimum storage capacity equivalent available power generation amount and the maximum storage capacity equivalent available power generation amount of the surface reservoir respectively;
The relation constraint of the surface reservoir capacity at the beginning and the end of water gushing recharging is that
Et,end＝β·Et0
Wherein: e t,end、Et0 is the surface reservoir capacity at the last moment of water gushing recharging and the surface reservoir capacity at the initial moment of water gushing recharging respectively; beta is a coefficient, and the value of beta is 1.
The model of the water source heat pump is
Wherein COP is the heating performance coefficient of the water source heat pump unit; c hp,P is the electric heating quantity of the water source heat pump unit, and the unit is: kW; p hp is the electric power consumed by the water source heat pump unit, and the unit is: kW; c hp,Y is the heat absorbed by the water source heat pump unit from the heat source side, and the unit is: kW; c is the specific heat capacity of the circulating working medium, and the unit is: j/(kg. DEG C); q is the mass flow of the circulating working medium, and the unit is: kg/s; t hp,in、Thp,out is the inlet temperature and outlet temperature of the evaporator side of the water source heat pump, and the unit is: the temperature is lower than the temperature; c is the total heating capacity of the water source heat pump unit, and the unit is: kW.
The system electric energy balance constraint is that
Php+P+Pim＝Pgrid+Pex
Wherein P is the electric load power of the coal mine, and the unit is: kW; p im is the electric power used by the variable-speed pumped storage unit, and the unit is: kW; p grid is the power of the system for purchasing electricity to the external power grid, and the unit is: kW; p ex is the power generated by the hydroelectric generating set, and the unit is: kW;
the system heat energy balance constraint is that
C＝Chp+Cbuy
Wherein, C is the total heat demand power of the system, unit: kW; c buy is the outsourcing thermal power of the system, unit: kW; the objective function is expressed as follows with the aim of optimizing the daily operation economy of the system
Z＝λP·Pgrid+λC·Cbuy
Wherein Z is the total cost of energy purchase for system operation, in units of: a meta-element; lambda P is the time-of-use electricity price, unit: meta/kWh; lambda C is the time-of-use heat value, unit: meta/kWh.
Compared with the prior art, the geothermal utilization and pumping and accumulating power generation system based on mine water inflow circulation can meet the water inflow safety discharge requirement, through a flexible water inflow pumping and discharging utilization mode of real-time response to electricity price change, not only can the full utilization of water inflow waste heat resources and the economic dispatching of water inflow be realized, but also the water inflow recharging potential energy can be utilized for generating power to form a clean power supply, the water resources are utilized for fully absorbing geothermal resources in a long time scale to form rich hot water, the integration and utilization of water inflow resources in and after mining of a mine can be realized, the safety pumping and discharging requirement of water inflow of the mine can be met, the full utilization of the rich hot water inflow resources and underground space after mining is realized, the associated resource waste under the coal mine safety production requirement is reduced, the conversion and utilization efficiency of energy resources is improved, and the system is particularly suitable for the comprehensive utilization of the water inflow resources, underground waste heat resources and underground space after mining and geothermal resources of the mine.
Drawings
FIG. 1 is a schematic diagram of the components of a geothermal utilization and pumped storage power generation system based on mine water inrush circulation;
FIG. 2 is a graph comparing economic dispatch results of a mine water-burst cycle-based geothermal utilization and pumping and accumulating power generation system used in a mountain west coal mine;
FIG. 3 is a schematic diagram of the COP change of a heat pump unit in the water gushing condition of a coal mine in Shanxi province;
FIG. 4 is a diagram of electrical heating load demand for a coal mine in Shanxi province;
FIG. 5 is an electrical power diagram for a mountain and western coal mine water burst drainage unit and a water source heat pump;
FIG. 6 is a schematic diagram of the power generation of a coal mine hydro-generator set and the amount of power that can be generated for storage in a reservoir in Shanxi province.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the geothermal utilization and pumping and accumulating power generation system based on mine water burst circulation comprises an underground water burst water bin pumping and discharging part, a water burst waste heat utilization part, a water burst recharging potential energy power generation part and a water resource infiltration recycling part.
The underground water flushing sump pumping and draining part comprises a water flushing sump and a water flushing and draining unit which are positioned underground, the underground drainage tank is connected with the water flushing sump through a variable-speed pumped storage unit, and the water flushing sump is connected with the pumping channel through the water flushing and draining unit.
The water gushing waste heat utilization part comprises a water source heat pump unit, and a heat exchange water inlet port of the water source heat pump unit is connected with the output end of the extraction channel.
The water-flushing recharging potential energy power generation part comprises a ground surface reservoir, a recharging channel and a hydroelectric generating set, wherein the water supplementing input end of the ground surface reservoir is connected with the heat exchange water outlet port of the water source heat pump unit, the water draining end of the ground surface reservoir is connected with the input end of the recharging channel, and the water turbine of the hydroelectric generating set is arranged in the recharging channel.
The water resource infiltration back circulation part comprises a mining working face reservoir arranged in a goaf above the water flushing sump, the drainage end of the recharging channel is connected with the mining working face reservoir, and rock stratum cracks are formed between the mining working face reservoir and the water flushing sump.
Geothermal utilization is carried out by utilizing a geothermal utilization and pumping and accumulating power generation system based on mine water inflow circulation, and the method comprises the following steps:
a. Mine water burst lifting: the hot water oozed out of the stratum aquifer in the mine exploitation process can be collected to a water-oozing water bin along the underground drainage tank, the water-oozing water bin can store water oozing in a short term within an allowable range, on the basis of meeting the capacity safety margin of the water flooding water bin, the drainage flow of the water flooding drainage unit can be set according to the water flooding amount, and the water flooding drainage unit is started to lift mine water flooding with waste heat resources to the ground in response to the real-time electricity price.
① Establishing a water surge sump model as
Wherein V is the capacity of the water sump, unit: m 3; q is the normal water inflow, unit: m 3/h;VK is the empty capacity of the water sump, unit: m 3.
② Building a model of a water gushing drainage unit as
Wherein W G is the running flow of the drainage unit, and the unit is: m 3/h;PG is the running power of the drainage unit, and the unit is: kW; p is the specific gravity of the medium, and water is 1000kg/m 3; g is gravity acceleration, 9.8N/kg is taken; h G is the lift of the drainage unit, and the unit is: m; η G is the running efficiency of the drainage unit.
③ Establishing water surge scheduling constraint as
Vt+1＝Vt+Qt-Wt
Wherein V t is the water inflow in the sump at time t; q t is the water gushing quantity at the moment t; w t is the water inflow amount extracted by the drainage unit at the moment t.
B. And (3) utilizing water burst waste heat: after mine water burst is lifted to the ground, geothermal resources drawn in the water burst and a heat exchange medium are subjected to heat exchange through a water burst water source heat pump unit, and meanwhile, real-time heat purchase cost and electricity purchase cost are considered, so that heat load requirements are jointly supplied by the water source heat pump unit through electric heating and external heat energy.
Establishing a water source heat pump model as
Wherein COP is the heating performance coefficient of the water source heat pump unit; c hp,P is the electric heating quantity of the water source heat pump unit, and the unit is: kW; p hp is the electric power consumed by the water source heat pump unit, and the unit is: kW; c hp,Y is the heat absorbed by the water source heat pump unit from the heat source side, and the unit is: kW; c is the specific heat capacity of the circulating working medium, and the unit is: j/(kg. DEG C); q is the mass flow of the circulating working medium, and the unit is: kg/s; t hp,in、Thp,out is the inlet temperature and outlet temperature of the evaporator side of the water source heat pump, and the unit is: the temperature is lower than the temperature; c is the total heating capacity of the water source heat pump unit, and the unit is: kW.
C. And (3) water flooding recharging potential energy power generation: and (3) conveying the water after heat exchange to the surface reservoir, opening a drainage end of the surface reservoir on the basis of meeting the safety margin of the surface reservoir capacity, and conveying the water of the surface reservoir back to a mining working face reservoir through a recharging channel, wherein the potential energy of the recharging water is converted into electric energy by a hydroelectric generating set during the recharging process, so that a clean power supply is formed.
① The power of the coal mine water-flushing pumped storage unit when operating in the pumping state is closely related to the type of the pumped storage unit, and the output constraint of the variable-speed pumped storage unit is established as follows
Wherein: the power generation and pumping power of the variable-speed pumping energy storage unit j in the period t are respectively as follows: kW; /(I) The minimum and the maximum power generation and pumping power of the variable-speed pumping energy storage unit j are respectively as follows: kW.
② Equivalent power generation capacity of the surface reservoir
Wherein: η j is the pumping energy storage efficiency of the variable-speed pumping energy storage unit j, and the value is 75%; j is the total number of variable-speed pumped storage units.
③ The earth surface reservoir can generate electricity to be constrained as
Emin≤Et≤Emax
Wherein: e min、Emax is the minimum storage capacity equivalent available power generation amount and the maximum storage capacity equivalent available power generation amount of the surface reservoir respectively.
④ The relation constraint of the surface reservoir capacity at the beginning and the end of water gushing recharging is that
Et,end＝β·Et0
Wherein: e t,end、Et0 is the surface reservoir capacity at the last moment of water gushing recharging and the surface reservoir capacity at the initial moment of water gushing recharging respectively; beta is a coefficient, and is determined by a dispatching mechanism according to the actual condition of the system, and for a daily regulation type pumped storage power station, the beta is usually 1.
⑤ The system electric energy balance constraint is that
Php+P+Pim＝Pgrid+Pex
Wherein P is the electric load power of the coal mine, and the unit is: kW; p im is the electric power used by the variable-speed pumped storage unit, and the unit is: kW; p grid is the power of the system for purchasing electricity to the external power grid, and the unit is: kW; p ex is the power generated by the hydroelectric generating set, and the unit is: kW.
⑥ The system heat energy balance constraint is that
C＝Chp+Cbuy
Wherein, C is the total heat demand power of the system, unit: kW; c buy is the outsourcing thermal power of the system, unit: kW.
⑦ The objective function is expressed as follows with the aim of optimizing the daily operation economy of the system
Z＝λP·Pgrid+λC·Cbuy
Wherein Z is the total cost of energy purchase for system operation, in units of: a meta-element; lambda P is the time-of-use electricity price, unit: meta/kWh; lambda C is the time-of-use heat value, unit: meta/kWh.
D. And (5) rewet heat storage: the reservoir of the working face is used as a long-term water storage space, the reinjection water is utilized to permeate back to the water flushing bin through the stratum fracture in a long time scale, the reinjection water fully absorbs geothermal resources in the backflushing process, a part of the heat-enriched water flushing is formed, and the cyclic utilization of the water flushing is realized.
Taking a certain coal mine in Shanxi as an example, daily curves such as water inflow of the coal mine, COP (coefficient of performance) of a water source heat pump unit, electric load, heat load data and the like are shown in fig. 3 and 4, normal water inflow is set to 300m 3/h, the heat taking temperature difference of the water source heat pump is 5 ℃, a Gurobi10.0.1 solver is called by MATLAB_R2021b to carry out simulation solution, the running power curve of a water drainage unit in the system, the electric power curve of the water source heat pump unit, the electric power generation curve of a hydroelectric unit and the like are shown in fig. 5 and 6, compared with the graph in fig. 2, the coal mine economical scheduling result is shown in fig. 2, and therefore, the geothermal utilization and pumping and accumulating power generation system based on the water inflow circulation of the coal mine not only meets the safety pumping and discharging requirements of the water inflow of the coal mine, but also realizes full utilization of waste heat resources and gravitational potential energy, waste resources under the safety production requirements of the coal mine are reduced, and the conversion and utilization efficiency of energy resources are improved.
Claims (5)
1. The geothermal utilization and pumping and accumulating power generation system based on mine water burst circulation is characterized by comprising an underground water burst water bin pumping and discharging part, a water burst waste heat utilization part, a water burst recharging potential energy power generation part and a water resource infiltration recycling part;
The underground water flushing sump pumping and draining part comprises a water flushing sump and a water flushing and draining unit which are positioned under the mine, the underground drainage tank is connected with the water flushing sump through a variable-speed pumped storage unit, and the water flushing sump is connected with the pumping channel through the water flushing and draining unit;
The water inflow waste heat utilization part comprises a water source heat pump unit, and a heat exchange water inlet port of the water source heat pump unit is connected with the output end of the extraction channel;
The water-flushing recharging potential energy power generation part comprises a ground surface reservoir, a recharging channel and a hydroelectric generating set, wherein the water-supplementing input end of the ground surface reservoir is connected with the heat exchange water outlet port of the water source heat pump unit, the water-draining end of the ground surface reservoir is connected with the input end of the recharging channel, and the water turbine of the hydroelectric generating set is arranged in the recharging channel;
The water resource infiltration-back circulation part comprises a mining working face reservoir arranged in a goaf above the water flushing sump, the drainage end of the recharge channel is connected with the mining working face reservoir, and rock stratum cracks are formed between the mining working face reservoir and the water flushing sump;
When geothermal utilization is performed by utilizing a geothermal utilization and pumping and accumulating power generation system based on mine water inflow circulation, the method specifically comprises the following steps:
a. Mine water burst lifting: the method comprises the steps that hot water oozing out from a stratum aquifer in the mine exploitation process is collected to a water-gushing water bin along an underground drainage groove, the drainage flow of a water-gushing water drainage unit is set according to the water-gushing amount on the basis of meeting the capacity safety margin of the water-gushing water bin, and the water-gushing water drainage unit is started to lift mine water gushing with waste heat resources to the ground in response to real-time electricity price;
b. And (3) utilizing water burst waste heat: after mine water is lifted to the ground, heat exchange is carried out on geothermal resources drawn in the water and a heat exchange medium through a water source heat pump unit, and meanwhile, the real-time purchase heat cost and the purchase electricity cost are considered, and the water source heat pump unit jointly supplies heat load demands through electric heating and external purchase heat energy;
c. and (3) water flooding recharging potential energy power generation: the water after heat exchange is conveyed to a surface reservoir, a drainage end of the surface reservoir is opened on the basis of meeting the safety margin of the surface reservoir capacity, the water of the surface reservoir is returned to a working face reservoir in a mining space through a recharging channel, and potential energy of the recharging water is converted into electric energy by a hydroelectric generating set during the recharging process;
d. And (5) rewet heat storage: the reservoir of the working face is used as a long-term water storage space, geothermal resources are absorbed by the reinjection water in the process of seeping back to the water flushing sump through the rock stratum fissure so as to form a part of the heat-enriched water flushing, and the cyclic utilization of the water flushing is realized.
2. The geothermal utilization and pumping and accumulating power generation system based on mine water flushing circulation according to claim 1, wherein the water flushing water sump model is
Wherein V is the capacity of the water sump, unit: m 3; q is the normal water inflow, unit: m 3/h;VK is the empty capacity of the water sump, unit: m 3;
The model of the water gushing and draining unit is
Wherein W G is the running flow of the water burst drainage unit, and the unit is: m 3/h;PG is the running power of the water burst drainage unit, and the unit is: kW; p is the specific gravity of the medium, and water is 1000kg/m 3; g is gravity acceleration, 9.8N/kg is taken; h G is the lift of the water burst drainage unit, and the unit is: m; η G is the running efficiency of the water inrush and drainage unit.
3. The geothermal utilization and pumped storage power generation system based on mine water flooding cycle of claim 2, wherein the water flooding scheduling constraint is
Vt+1＝Vt+Qt-Wt
Wherein V t is the water inflow in the sump at time t; v t+1 is the water inflow in the sump at time t+1; q t is the water gushing quantity at the moment t; w t is the water inflow amount extracted by the water inflow drainage unit at the moment t;
the output constraint of the variable-speed pumped storage unit is
Wherein: the power generation and pumping power of the variable-speed pumping energy storage unit j in the period t are respectively as follows: kW; the minimum and the maximum power generation and pumping power of the variable-speed pumping energy storage unit j are respectively as follows: kW;
equivalent power generation capacity of the surface reservoir
Wherein: e t is equivalent generatable energy of converting the capacity of the surface reservoir at the moment t; e t-1 is equivalent generatable energy of converting the capacity of the surface reservoir at the moment t-1; η j is the pumping energy storage efficiency of the variable-speed pumping energy storage unit j, and the value is 75%; j is the total number of variable-speed pumped storage units;
The earth surface reservoir can generate electricity to be constrained as
Emin≤Et≤Emax
Wherein: e min、Emax is the minimum storage capacity equivalent available power generation amount and the maximum storage capacity equivalent available power generation amount of the surface reservoir respectively;
The relation constraint of the surface reservoir capacity at the beginning and the end of water gushing recharging is that
Et,end＝β·Et0
Wherein: e t,end、Et0 is the surface reservoir capacity at the last moment of water gushing recharging and the surface reservoir capacity at the initial moment of water gushing recharging respectively; beta is a coefficient, and the value of beta is 1.
4. The geothermal utilization and pumped storage power generation system based on mine water inflow circulation of claim 3, wherein the water source heat pump model is
Wherein COP is the heating performance coefficient of the water source heat pump unit; c hp,P is the electric heating quantity of the water source heat pump unit, and the unit is: kW; p hp is the electric power consumed by the water source heat pump unit, and the unit is: kW; c hp,Y is the heat absorbed by the water source heat pump unit from the heat source side, and the unit is: kW; c is the specific heat capacity of the circulating working medium, and the unit is: j/(kg. DEG C); q is the mass flow of the circulating working medium, and the unit is: kg/s; t hp,in、Thp,out is the inlet temperature and outlet temperature of the evaporator side of the water source heat pump, and the unit is: the temperature is lower than the temperature; c hp is the total heating capacity of the water source heat pump unit, and the unit is: kW.
5. The geothermal utilization and pumped storage power generation system based on mine water inrush cycle of claim 4, wherein the system electrical energy balance constraint is
Php+P+Pim＝Pgrid+Pex
Wherein P is the electric load power of the coal mine, and the unit is: kW; p im is the electric power used by the variable-speed pumped storage unit, and the unit is: kW; p grid is the power of the system for purchasing electricity to the external power grid, and the unit is: kW; p ex is the power generated by the hydroelectric generating set, and the unit is: kW;
the system heat energy balance constraint is that
C＝Chp+Cbuy
Wherein, C is the total heat demand power of the system, unit: kW; c buy is the outsourcing thermal power of the system, unit: kW;
The objective function is expressed as follows with the aim of optimizing the daily operation economy of the system
Z＝λP·Pgrid+λC·Cbuy
Wherein Z is the total cost of energy purchased per hour of system operation, in units of: meta/h; lambda P is the time-of-use electricity price, unit: meta/kWh; lambda C is the time-of-use heat value, unit: meta/kWh.
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