Combined cooling heating and power multi-energy complementary system based on biomass energy, solar energy and wind energy

Abstract

The invention provides a combined cooling heating and power multi-energy complementary system based on biomass energy, solar energy and wind energy. The combined cooling heating and power multi-energy complementary system comprises an electric power balance system, a heat balance system and a cold balance system. According to the system, biomass energy, solar energy and wind energy are utilized, the problems that current primary energy consumption is too fast and carbon emission is too high can be solved, power generation and gas generation of the system are dynamically utilized for reasonable distribution of the system, a balance system for a user to meet the power requirement and the cooling and heating load requirement is achieved, and utilization of clean energy, straw, waste gas and the like are achieved. The livestock manure is reasonably and fully utilized, the problem of dynamic multi-energy complementation is solved, and the problems of biomass energy waste and environmental pollution are solved to the maximum extent.

Description

Technical Field

[0001] The present invention belongs to the field of clean energy multi-energy complementation, and specifically relates to a multi-energy complementary system for combined cooling, heating and power generation based on biomass energy, solar energy and wind energy. Background Art

[0002] At present, the global consumption of primary energy such as oil and natural gas is increasing, and its storage capacity is sharply decreasing. This makes it difficult to meet the needs of sustainable social development. The regional energy multi-energy complementary system takes electricity as the core, and other clean energy such as solar energy and wind energy are coupled to achieve self-supply and self-use, meeting the required electricity, cooling and heating needs.

[0003] my country is a big agricultural country, but there are still major problems in the treatment of straw and livestock manure, which not only harms the environment but also causes waste of bioenergy.

[0004] Therefore, it is necessary to design a multi-energy complementary system based on biomass energy, solar energy and wind energy to fully utilize biomass energy, meet users' electricity needs and balance the cooling and heating load needs to solve the current technical problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a multi-energy complementary system for combined cooling, heating and power generation based on biomass energy, solar energy and wind energy, which fully utilizes biomass energy and provides users with a balance between electricity demand and cooling and heating load demand.

[0006] The technical solution of the present invention is: a multi-energy complementary system for combined cooling, heating and power generation based on biomass energy, solar energy and wind energy, comprising:

[0007] Power balance system, heat balance system and cold balance system;

[0008] The power balancing system includes a photovoltaic power generation system, a wind power generation system, a gas turbine, an ORC power generation system, a power storage system and a power grid. The photovoltaic power generation system, the wind power generation system, the gas turbine and the ORC power generation system are all connected to the power storage system, and the power storage system is connected to the power grid;

[0009] The heat balance system includes a solar collector, a biogas tank, a heat collection tank, a biomass boiler, a heat exchanger and a ground source heat pump system, and the solar collector, the biomass boiler, the heat exchanger and the ground source heat pump system are all connected to the heat collection tank;

[0010] The cold balance system includes a ground source heat pump system and an absorption refrigeration unit;

[0011] The heat collecting tank is respectively connected to the absorption refrigeration unit, the ground source heat pump system, and the ORC power generation system;

[0012] The biogas pool is connected with a gas storage tank, the gas storage tank is connected with the gas turbine, and the heat exchanger is connected with the gas turbine.

[0013] The power generation combination model of the power balance system is as follows:

[0014] p w =p wind +p PV +p GT +p ORC (1)

[0015] Where P w is the total power generation; P wind is the power generation of the wind power generation system; P PV is the power generation of the photovoltaic power generation system; P GT is the power generation of the gas turbine; P ORC is the power generation of the ORC power generation system.

[0016] The power generation of the wind power generation system is expressed as:

[0017]

[0018] Where P wind is the power generation of the wind power generation system (kW); ρ is the air density (kg / m 3 ); A is the blade swept area (m 2 );v is wind speed (m / s); C p is the power coefficient; η is the generator efficiency.

[0019] The power generation of the photovoltaic power generation system is expressed as formula (3):

[0020] P PV =AR STC (1+Y(T cel -T STC ))H T P R (3)

[0021] Where P PV is the power generation of the photovoltaic power generation system (kW); A is the total area of ​​the photovoltaic array (m 2 );R STC is the conversion efficiency under standard test; Y is the temperature coefficient; T cell is the battery operating temperature (℃); T STC is the standard test temperature (℃); H T is the total solar radiation on the inclined surface (kWh / m 2 );P R is the performance ratio, PR The value range is 0.75 to 0.90.

[0022] The power generation of the ORC power generation system is expressed as:

[0023] P ORC =m(h 1 -h 2 )η th η mech η gen (4)

[0024] Where P ORC is the power generation of the ORC power generation system (kW); m is the mass flow rate of the working fluid (kg / s); h 1 is the enthalpy of the working fluid entering the expander (kJ / kg); h 2 is the enthalpy of the working fluid coming out of the expander (kJ / kg); η th is the thermal efficiency of the thermodynamic cycle; η mech is the mechanical efficiency; η gen is the generator efficiency.

[0025] The thermal efficiency η th It can be calculated according to the heat source temperature and working fluid characteristics as formula (5):

[0026]

[0027] Where η th is the thermal efficiency of the thermodynamic cycle; T h is the heat source temperature (K); T c is the cold source temperature (K).

[0028] The gas turbine power generation is expressed as formula (6):

[0029] P GT =(m a *(h 1 -h 2 )-m f *LHV-W c )η t η g (6)

[0030] Where P GT is the power generation of the gas turbine (kW); m a is the air mass flow rate entering the gas turbine (kg / s); h 1 is the enthalpy of air entering the gas turbine (kJ / kg); h 2 is the exhaust gas enthalpy from the gas turbine (kJ / kg); m fis the fuel mass flow rate (kg / s); LHV is the lower calorific value of the fuel (kJ / kg); W c is the compressor power (kW); η t is the thermal efficiency of the gas turbine; η g is the efficiency of the generator.

[0031] The total heat production of the biomass boiler, heat exchanger and ground source heat pump system is as follows:

[0032] Q H =Q R +Q HX +Q HHP (7)

[0033] In the formula, Q H is the total amount of heat produced (kW); Q R is the heat output of the biomass boiler (kW); Q HX is the heating capacity of the heat exchanger (kW); Q HHP is the heating capacity of the ground source heat pump system (kW);

[0034] The heat output of the biomass boiler is Q R Formula (8):

[0035] Q R =m*LHV*η R (8)

[0036] In the formula, Q R is the heat output of the biomass boiler (kW); m is the mass of the straw fuel provided (kg); LHV is the calorific value of the straw used (kJ / kg); η R is the efficiency of the biomass boiler, η R Take 0.8;

[0037] The heating capacity Q of the heat exchanger HX Formula (9):

[0038] Q HX =Q GT *η HX (9)

[0039] In the formula, Q HX is the heating capacity of the heat exchanger (kW); Q GT The waste heat of high-temperature flue gas generated by the gas turbine (kW); η HX is the working efficiency of the heat exchanger, η HX Take 0.8;

[0040] The heating capacity of the ground source heat pump system is Q HHP is formula (10);

[0041] QHHP =W HHP *COP H *η HHP (10)

[0042] In the formula, Q HHP is the heating capacity of the ground source heat pump system (kW); W HHP is the heating power of the heat pump (kW); COP H is the heating COP of the heat pump, COP H The value range of η is 3.5~6.0; HHP is the working efficiency of the heat pump during heating, η HHP The value range is 0.75~0.95.

[0043] The total cooling capacity of the absorption refrigeration unit and the ground source heat pump system is (11):

[0044] Q C =Q AC +Q CHP (11)

[0045] In the formula, Q C is the total cooling capacity of the system; Q AC is the cooling capacity of the absorption chiller; Q CHP is the cooling capacity of the ground source heat pump system;

[0046] The cooling capacity Q of the absorption refrigerator AC Formula (12):

[0047] Q AC =m*c*(T 1 -T 2 )*COP AC (12)

[0048] In the formula, Q AC is the cooling capacity of the absorption refrigerator; m is the mass flow rate of the heat source when the absorption refrigerator is working (kg / s); c is the specific heat capacity of the flow medium; T 1 is the heat source water inlet temperature; T 2 is the outlet water temperature of the heat source; COP AC is the refrigeration efficiency of the absorption refrigeration unit;

[0049] The cooling capacity Q of the ground source heat pump system CHP Formula (13):

[0050] Q CHP =W CHP *COP C *η CHP (13)

[0051] In the formula, QCHP is the heating capacity of the ground source heat pump system (kW); W CHP is the cooling power of the heat pump (kW); COP C is the cooling COP of the heat pump, COP C The value range of η is 3.5~5.5; CHP is the working efficiency of the heat pump during cooling, η CHP The value range is 0.75~0.95.

[0052] The photovoltaic power generation system, wind power generation system, gas turbine, and ORC power generation system are all connected to the power storage system through electrical lines, and the power storage system is connected to the power grid through electrical lines;

[0053] The solar collector, biomass boiler, heat exchanger, and ground source heat pump system are all connected to the heat collection tank via water pipes;

[0054] The heat collecting tank is connected to the absorption refrigeration unit, the ground source heat pump system and the ORC power generation system through water pipes respectively.

[0055] Beneficial effects of the present invention:

[0056] (1) In the present invention, by utilizing biomass energy, solar energy, and wind energy, the current problems of excessive primary energy consumption and excessive carbon emissions can be solved. The system can be dynamically utilized to generate electricity and gas to give the system a reasonable allocation, thereby achieving a balanced system for users to meet their electricity needs and cooling and heating load needs, realizing the utilization of clean energy, the reasonable and full use of straw and livestock manure, solving the problem of dynamic multi-energy complementarity, and solving the problem of biomass energy waste and environmental pollution to the greatest extent;

[0057] (2) In this complementary system, electricity is mainly generated by photovoltaic power generation systems and wind power generation systems. When the power generation is greater than the system power consumption, the excess power can be stored in the power storage system. When the excess power is greater than the power storage system, the excess power is sold to the power grid;

[0058] (3) When the power output of the photovoltaic power generation system and the wind power generation system is less than the power consumption of the system, and the power output of the ORC waste heat power generation and the gas turbine for auxiliary power is insufficient, electricity can be purchased from the power grid to ensure the stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a principle block diagram of the multi-energy complementary system of combined cooling, heating and power based on biomass energy, solar energy and wind energy in the present invention.

[0060] Figure 2 It is a principle block diagram of the heating season of the multi-energy complementary system of combined cooling, heating and power based on biomass energy, solar energy and wind energy in the present invention.

[0061] Figure 3 It is a principle block diagram of the cooling season of the multi-energy complementary system of combined cooling, heating and power based on biomass energy, solar energy and wind energy in the present invention.

[0062] Figure 4 It is a principle block diagram of the transition season of the multi-energy complementary system of combined heat and power generation based on biomass energy, solar energy and wind energy in the present invention. DETAILED DESCRIPTION

[0063] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is not intended to be any limitation on the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limitations.

[0064] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0065] like Figure 1As shown, a multi-energy complementary system for combined heat and power generation based on biomass energy, solar energy and wind energy includes: a power balance system, a heat balance system and a cold balance system; the power balance system includes a photovoltaic power generation system 2, a wind power generation system 5, a gas turbine 7, an ORC power generation system 13, a power storage system 8 and a power grid 20, and the photovoltaic power generation system 2, the wind power generation system 5, the gas turbine 7, and the ORC power generation system 13 are all connected to the power storage system 8, and the power storage system 8 is connected to the power grid 20; the heat balance system includes a solar collector 1, a biogas tank 3, a heat collection tank 10, a biomass boiler 4, a heat exchanger 9 and a ground source heat pump system 12, and the solar collector 1, the biomass boiler 4, the heat exchanger 9, the ground source heat pump system The system 12 is connected to the water collecting tank 10; the cold balance system includes a ground source heat pump system 12 and an absorption refrigeration unit 11; the water collecting tank 10 is respectively connected to the absorption refrigeration unit 11, the ground source heat pump system 12, and the ORC power generation system 13; the biogas pool 3 is connected to a gas storage tank 6, the gas storage tank 6 is connected to the gas turbine 7, and the heat exchanger 9 is connected to the gas turbine 7; in this embodiment, the energy of the combined heat and power generation multi-energy complementary system of biomass energy, solar energy, and wind energy comes from four sources. The first part comes from solar energy 17, which generates electricity through a photovoltaic power generation system 2, and collects heat through a solar collector 1 to heat water; the second part comes from biomass energy 18, which is mainly straw and livestock manure, and a part of the biomass energy The straw in 18 is used to act on the biomass boiler 4 to generate heat to heat water, and another part of the straw and feces in the biomass energy 18 is used in the biogas digester 3 to generate biogas and then supplied to the gas turbine 7 for use to generate electricity and high-temperature flue gas after being processed; the third part is wind energy 19 to generate electricity through the wind power generation system 5; the fourth part is the power grid 20, which is used to supplement the power of the system when the power generation is insufficient, and can be sold when there is excess power; in this complementary system, electricity mainly depends on the power generation of the photovoltaic power generation system 2 and the wind power generation system 5. When the power generation is greater than the power consumption of the system, the excess power can be stored in the power storage system 8. When the excess power is greater than the power storage system 8, the excess power is sold on the power grid 20; When the power generation of the photovoltaic power generation system 2 and the wind power generation system 5 is less than the power consumption of the system, and the power generation of the ORC waste heat power generation 13 and the gas turbine 7 for auxiliary power are insufficient, electricity can be purchased from the power grid 20 to ensure the stable operation of the system; in this embodiment, by utilizing biomass energy, solar energy and wind energy, the current problems of excessive primary energy consumption and excessive carbon emissions can be solved, and the system can be dynamically utilized to generate electricity and gas to give a reasonable distribution to the system, so as to achieve a balanced system for users to meet their electricity needs and cold and heat load needs, realize the utilization of clean energy, and reasonably and fully utilize straw and livestock manure, solve the problem of dynamic multi-energy complementarity, and solve the problem of biomass energy waste and environmental pollution to the greatest extent.

[0066] A year can be divided into heating season, cooling season and transition season. The combined heat and power multi-energy complementary system based on biomass energy, solar energy and wind energy has different operating modes in these three different time periods.

[0067] During the heating season, Figure 2 As shown, the photovoltaic power generation system 2, the wind power generation system 5 and the gas turbine 7 are all connected to the power storage system 8 through electric lines; the power storage system 8 is connected to the power grid 20 through electric lines; the power storage system 8 is connected to the electric load 16 through electric lines; the solar collector 1, the biomass boiler 4 and the heat collection tank 10 are connected through hot water pipes, and the heat exchanger 9 is connected to the heat collection tank 10. Finally, the heat of the three heat sources will be led to the heat collection tank 10 through the hot water pipe; the heat collection tank 10 is connected to the biogas pool 3 and the ground source heat pump system 12 through hot water pipes; the ground source heat pump system 12 meets the indoor heat load; the gas turbine 7 is connected to the heat exchanger 9 through a hot air pipe; the biogas pool 3 and the gas storage tank 6 are connected through an air pipe, and the gas storage tank 6 is connected to the gas turbine 7 through an air pipe; the solar power generation system 2 and the wind power generation system 5 are the main parts of the system electricity consumption. Due to the low temperature in the heating season, the hot water generated by the solar collector 1 is not It is enough to drive the ORC power generation system 13 to generate electricity, and the temperature of the biogas pool 3 is relatively low and its gas production is very low, so the hot water generated by the solar collector 1 in winter is preferentially used to assist in heating the biogas pool 3, so that the internal temperature of the biogas pool is maintained at about 35°C; and because the system is based in the northern region, its heating season is relatively long, the cooling season is short, and the heat load demand is relatively large. The year-round operation of its ground source heat pump system 12 may cause the temperature of the buried pipe to decrease, destroy the soil temperature balance and cause the overall efficiency of the system to decrease, so the hot water generated in the heating season can be supplied to the return water side of the ground source heat pump system 12 for auxiliary heating to reduce the absorption of soil heat; and the excess hot water can be supplied to users for domestic hot water; when encountering extreme weather, the power generation and heat generation are very scarce, the biomass boiler 4 can be used for heating accordingly, and the gas turbine 7 can be temporarily turned on according to the surplus of biogas to generate heat and generate electricity. When the electricity is still insufficient, the electricity from the power grid can be used to ensure the stable operation of the system.

[0068] In the cooling season, Figure 3As shown, the photovoltaic power generation system 2, the wind power generation system 5 and the gas turbine 7 are all connected to the power storage system 8 through electric lines; the power storage system 8 is connected to the power grid 20 through electric lines; the power storage system 8 is connected to the electric load 16 through electric lines; the solar collector 1, the biomass boiler 4 and the heat exchanger 9 are connected through hot water pipes, and the heat exchanger 9 is connected to the heat collection tank 10, and finally the heat of the three heat sources will be transferred to the heat collection tank 10 through the hot water pipe; the heat collection tank 10 is connected to the biogas tank 3 and the absorption refrigeration unit 11 through hot water pipes; the absorption refrigeration unit 11 and the ground source heat pump system 12 meet the indoor cooling load 14; the gas turbine 7 is connected to the heat exchanger 9 through a hot air pipe; the biogas tank 3 is connected to the gas storage tank 6 through an air pipe, and the gas storage tank 6 is connected to the gas turbine 7 through an air pipe During the day, the photovoltaic power generation system 2 and the wind power generation system 5 are the main parts of the system's electricity consumption. At this time, the temperature of the hot water generated by the solar collector 1 is relatively high, and can be supplied to the absorption refrigeration unit 11 to provide part of the room's cooling load. When the load demand is greater than the cooling capacity generated by the absorption refrigeration unit 11, the ground source heat pump system 12 is driven to provide excess cooling capacity. The gas turbine 7 can be used during the day if there is sufficient biogas, and the waste heat is used to reheat the hot water from the solar collector 1 through the heat exchanger 9 to improve the system's operating efficiency. At night, the water temperature drops and the absorption refrigeration machine 11 cannot be driven to operate, and the ground source heat pump system 12 bears the cooling load. If the power generation and the power storage system 8 cannot meet the system's needs during system operation, power will be purchased from the power grid 20 to ensure stable system operation.

[0069] In transitional seasons, such as Figure 4As shown, the photovoltaic power generation system 2, the wind power generation system 4, the ORC power generation system 13 and the gas turbine 7 are all connected to the power storage system 8 through electric lines; the power storage system 8 is connected to the power grid 20 through electric lines; the power storage system 8 is connected to the electric load 16 through electric lines; the solar collector 1, the biomass boiler 4 and the heat exchanger 9 are connected through hot water pipes, and the heat exchanger 9 is connected to the heat collection tank 10, and finally the heat of the three heat sources will be transferred to the heat collection tank 10 through the hot water pipe; the heat collection tank 10 is connected to the biogas tank 4 and the ORC power generation system 13 through hot water pipes; the gas turbine 7 is connected to the heat exchanger 9 through a hot air pipe; the biogas tank 3 is connected to the gas storage tank 6 through an air pipe, and the gas storage tank 6 is connected to the gas turbine 7 through an air pipe; at this time There is no need to provide cooling and heating for users. The electricity generated by solar energy 17 and wind energy 19 is used for the system first. The hot water generated by the solar collector 1 is mainly used to drive the ORC power generation system 13 to generate electricity. The remaining low-temperature waste heat is used to ensure that the temperature of the biogas tank 3 is around 35°C. When the hot water temperature is not enough to drive the ORC power generation system 13 to generate electricity during the day, the stored biogas can be used to drive the gas turbine 7 to generate electricity and heat for the system. In the transition season, it does not need to provide cooling and heating loads for the room, and uses more excess energy to drive the gas turbine 7 and the ORC power generation system 13 to generate electricity, so the electricity is abundant. When the excess electricity is greater than the power storage system 8, all the excess electricity is sold to the power grid 20 to reduce the system operation cost.

[0070] In the above embodiment, the power balance system power generation combination model is formula (1):

[0071] p w =p wind +p PV +p GT +p ORC (1)

[0072] Where P w is the total power generation; P wind is the power generation of the wind power generation system; P PV is the power generation of the photovoltaic power generation system; P GT is the power generation of the gas turbine; P ORC is the power generation of the ORC power generation system.

[0073] In the above embodiment, the power generation of the wind power generation system is expressed as formula (2):

[0074]

[0075] Where P wind is the power generation of the wind power generation system (kW); ρ is the air density (kg / m 3 ); A is the blade swept area (m 2);v is wind speed (m / s); C p is the power coefficient; η is the generator efficiency.

[0076] In the above embodiment, the power generation of the photovoltaic power generation system is expressed as formula (3):

[0077] P PV =AR STC (1+Y(T cell -T STC ))H T P R (3)

[0078] Where P PV is the power generation of the photovoltaic power generation system (kW); A is the total area of ​​the photovoltaic array (m 2 );R STC is the conversion efficiency under standard test; Y is the temperature coefficient; T cell is the battery operating temperature (℃); T STC is the standard test temperature (℃); H T is the total solar radiation on the inclined surface (kWh / m 2 );P R is the performance ratio, P R The value range is 0.75 to 0.90.

[0079] In the above embodiment, the power generation of the ORC power generation system is expressed as formula (4):

[0080] P ORC =m(h 1 -h 2 )η th η mech η gen (4)

[0081] Where P ORC is the power generation of the ORC power generation system (kW); m is the mass flow rate of the working fluid (kg / s); h 1 is the enthalpy of the working fluid entering the expander (kJ / kg); h 2 is the enthalpy of the working fluid coming out of the expander (kJ / kg); η th is the thermal efficiency of the thermodynamic cycle; η mech is the mechanical efficiency; η gen is the generator efficiency.

[0082] In the above embodiment, the thermal efficiency η th It can be calculated according to the heat source temperature and working fluid characteristics as formula (5):

[0083]

[0084] Where ηth is the thermal efficiency of the thermodynamic cycle; T h is the heat source temperature (K); T c is the cold source temperature (K).

[0085] In the above embodiment, the power generation of the gas turbine is expressed as formula (6):

[0086] P GT =(m a *(h 1 -h 2 )-m f *LHV-W c )η t η g (6)

[0087] Where P GT is the power generation of the gas turbine (kW); m a is the air mass flow rate entering the gas turbine (kg / s); h 1 is the enthalpy of air entering the gas turbine (kJ / kg); h 2 is the exhaust gas enthalpy from the gas turbine (kJ / kg); m f is the fuel mass flow rate (kg / s); LHV is the lower calorific value of the fuel (kJ / kg); W c is the compressor power (kW); η t is the thermal efficiency of the gas turbine; η g is the efficiency of the generator.

[0088] In the above embodiment, the total heat generation of the biomass boiler, the heat exchanger and the ground source heat pump system is expressed as formula (7):

[0089] Q H =Q R +Q HX +Q HHP (7)

[0090] In the formula, Q H is the total amount of heat produced (kW); Q R is the heat output of the biomass boiler (kW); Q HX is the heating capacity of the heat exchanger (kW); Q HHP is the heating capacity of the ground source heat pump system (kW);

[0091] Heat output of biomass boiler Q R Formula (8):

[0092] Q R =m*LHV*η R (8)

[0093] In the formula, QR is the heat output of the biomass boiler (kW); m is the mass of the straw fuel provided (kg); LHV is the calorific value of the straw used (kJ / kg); η R is the efficiency of the biomass boiler, η R Take 0.8;

[0094] Heating capacity of heat exchanger Q HX Formula (9):

[0095] Q HX =Q GT *η HX (9)

[0096] In the formula, Q HX is the heating capacity of the heat exchanger (kW); Q GT The waste heat of high-temperature flue gas generated by the gas turbine (kW); η HX is the working efficiency of the heat exchanger, η HX Take 0.8;

[0097] Heating capacity of ground source heat pump system Q HHP is formula (10);

[0098] Q HHP =W HHP *COP H η HHP (10)

[0099] In the formula, Q HHP is the heating capacity of the ground source heat pump system (kW); W HHP is the heating power of the heat pump (kW); COP H is the heating COP of the heat pump, COP H The value range of η is 3.5~6.0; HHP is the working efficiency of the heat pump during heating, η HHP The value range is 0.75~0.95.

[0100] In the above embodiment, the cooling capacity of the absorption refrigeration unit and the cooling capacity of the ground source heat pump system are summed up as (11):

[0101] Q C =Q AC +Q CHP (11)

[0102] In the formula, Q C is the total cooling capacity of the system; Q AC is the cooling capacity of the absorption refrigerator; Q CHP is the cooling capacity of the ground source heat pump system;

[0103] Refrigeration capacity of absorption chiller QAC Formula (12):

[0104] Q AC =m*c*(T 1 -T 2 )*COP AC (12)

[0105] In the formula, Q AC is the cooling capacity of the absorption refrigerator; m is the mass flow rate of the heat source when the absorption refrigerator is working (kg / s); c is the specific heat capacity of the flow medium. In this embodiment, water is used as the medium, and the specific heat capacity is 4.19*103kJ / kg; T 1 is the heat source water inlet temperature; T 2 is the outlet water temperature of the heat source; COP AC is the refrigeration efficiency of the absorption refrigeration unit;

[0106] Cooling capacity Q of ground source heat pump system CHP Formula (13):

[0107] Q CHP =W CHP *COP C *η CHP (13)

[0108] In the formula, Q CHP is the heating capacity of the ground source heat pump system (kW); W CHP is the cooling power of the heat pump (kW); COP C is the cooling COP of the heat pump, COP C The value range of η is 3.5~5.5; CHP is the working efficiency of the heat pump during cooling, η CHP The value range is 0.75~0.95.

[0109] In some embodiments, the photovoltaic power generation system 2, the wind power generation system 5, the gas turbine 7, and the ORC power generation system 13 are all connected to the power storage system 8 through electric lines, and the power storage system 8 is connected to the power grid 20 through electric lines; the solar collector 1, the biomass boiler 4, the heat exchanger 9, and the ground source heat pump system 12 are all connected to the water collection tank 10 through water pipes; the water collection tank 10 is respectively connected to the absorption refrigeration unit 11, the ground source heat pump system 12, and the ORC power generation system 13 through water pipes.

[0110] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0111] The above-mentioned embodiments only express some implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A multi-energy complementary system for combined cooling, heating and power generation based on biomass energy, solar energy and wind energy, characterized in that: include: Power balance system, heat balance system and cold balance system; The power balancing system includes a photovoltaic power generation system, a wind power generation system, a gas turbine, an ORC power generation system, a power storage system and a power grid. The photovoltaic power generation system, the wind power generation system, the gas turbine and the ORC power generation system are all connected to the power storage system, and the power storage system is connected to the power grid; The heat balance system includes a solar collector, a biogas tank, a heat collection tank, a biomass boiler, a heat exchanger and a ground source heat pump system, and the solar collector, the biomass boiler, the heat exchanger and the ground source heat pump system are all connected to the heat collection tank; The cold balance system includes a ground source heat pump system and an absorption refrigeration unit; The heat collecting tank is respectively connected to the absorption refrigeration unit, the ground source heat pump system, and the ORC power generation system; The biogas pool is connected with a gas storage tank, the gas storage tank is connected with the gas turbine, and the heat exchanger is connected with the gas turbine.

2. The multi-energy complementary system for combined cooling, heating and power generation based on biomass energy, solar energy and wind energy according to claim 1 is characterized by: The power generation combination model of the power balance system is as follows: p w =p wind +p PV +p GT +p ORC (1) Where P w is the total power generation; P wind is the power generation of the wind power generation system; P PV is the power generation of the photovoltaic power generation system; P GT is the power generation of the gas turbine; P ORC is the power generation of the ORC power generation system.

3. The multi-energy complementary system for combined cooling, heating and power generation based on biomass energy, solar energy and wind energy according to claim 1 is characterized by: The power generation of the wind power generation system is expressed as: Where P wind is the power generation of the wind power generation system (kW); ρ is the air density (kg / m 3 ); A is the blade swept area (m 2 );v is wind speed (m / s); C p is the power coefficient; η is the generator efficiency.

4. The multi-energy complementary system for combined cooling, heating and power generation based on biomass energy, solar energy and wind energy according to claim 1 is characterized by: The power generation of the photovoltaic power generation system is expressed as formula (3): P PV =AR STC (1+Y(T cell -T STC ))H T P R (3) Where P PV is the power generation of the photovoltaic power generation system (kW); A is the total area of ​​the photovoltaic array (m 2 );R STC is the conversion efficiency under standard test; Y is the temperature coefficient; T cell is the battery operating temperature (℃); T STC is the standard test temperature (℃); H T is the total solar radiation on the inclined surface (kWh / m 2 );P R is the performance ratio, P R The value range is 0.75 to 0.

90.

5. The multi-energy complementary system for combined cooling, heating and power generation based on biomass energy, solar energy and wind energy according to claim 1 is characterized by: The power generation of the ORC power generation system is expressed as: P ORC =m(h1-h2)η th or mech or gen (4) Where P ORC is the power generation of the ORC power generation system (kW); m is the mass flow rate of the working fluid (kg / s); h1 is the enthalpy value of the working fluid entering the expander (kJ / kg); h2 is the enthalpy value of the working fluid leaving the expander (kJ / kg); η th is the thermal efficiency of the thermodynamic cycle; η mech is the mechanical efficiency; η gen is the generator efficiency.

6. The multi-energy complementary system for combined cooling, heating and power generation based on biomass energy, solar energy and wind energy according to claim 5 is characterized by: The thermal efficiency η th It can be calculated according to the heat source temperature and working fluid characteristics as formula (5): Where η th is the thermal efficiency of the thermodynamic cycle; T h is the heat source temperature (K); T c is the cold source temperature (K).

7. The multi-energy complementary system of combined cooling, heating and power based on biomass energy, solar energy and wind energy according to claim 1 is characterized by: The gas turbine power generation is expressed as formula (6): P GT =(m a * (h1-h2)-m f *LHV-W c )or t or g (6) Where P GT is the power generation of the gas turbine (kW); m a is the mass flow rate of air entering the gas turbine (kg / s); h1 is the enthalpy of air entering the gas turbine (kJ / kg); h2 is the enthalpy of exhaust gas from the gas turbine (kJ / kg); m f is the fuel mass flow rate (kg / s); LHV is the lower calorific value of the fuel (kJ / kg); W c is the compressor power (kW); η t is the thermal efficiency of the gas turbine; η g is the efficiency of the generator.

8. The multi-energy complementary system for combined cooling, heating and power generation based on biomass energy, solar energy and wind energy according to claim 1 is characterized by: The total heat production of the biomass boiler, heat exchanger and ground source heat pump system is as follows: Q H =Q R +Q HX +Q HHF (7) In the formula, Q H is the total amount of heat produced (kW); Q R is the heat output of the biomass boiler (kW); Q HX is the heating capacity of the heat exchanger (kW); Q HHP is the heating capacity of the ground source heat pump system (kW); The heat output of the biomass boiler is Q R Formula (8): Q R =m*LHV*η R (8) In the formula, Q R is the heat output of the biomass boiler (kW); m is the mass of the straw fuel provided (kg); LHV is the calorific value of the straw used (kJ / kg); η R is the efficiency of the biomass boiler, η R Take 0.8; The heating capacity Q of the heat exchanger HX Formula (9): Q HX =Q GT *η HX (9) In the formula, Q HX is the heating capacity of the heat exchanger (kW); Q GT The waste heat of high-temperature flue gas generated by the gas turbine (kW); η HX is the working efficiency of the heat exchanger, η Hx Take 0.8; The heating capacity of the ground source heat pump system is Q HHP is formula (10); Q HHP =W HHP *COP H *η HHP (10) In the formula, Q HHP is the heating capacity of the ground source heat pump system (kW); W HHP is the heating power of the heat pump (kW); COP H is the heating COP of the heat pump, COP H The value range of η is 3.5~6.0; HHP is the working efficiency of the heat pump during heating, η HHP The value range is 0.75~0.

95.

9. The multi-energy complementary system for combined cooling, heating and power generation based on biomass energy, solar energy and wind energy according to claim 1 is characterized by: The total cooling capacity of the absorption refrigeration unit and the ground source heat pump system is (11): Q C =Q AC +Q CHP (11) In the formula, Q C is the total cooling capacity of the system; Q AC is the cooling capacity of the absorption chiller; Q CHP is the cooling capacity of the ground source heat pump system; The cooling capacity Q of the absorption refrigerator AC Formula (12): Q AC =m*c*(T1-T2) * COP AC (12) In the formula, Q AC is the cooling capacity of the absorption refrigerator; m is the mass flow rate of the heat source when the absorption refrigerator is working (kg / s); c is the specific heat capacity of the flow medium; T1 is the inlet water temperature of the heat source; T2 is the outlet water temperature of the heat source; COP AC is the refrigeration efficiency of the absorption refrigeration unit; The cooling capacity Q of the ground source heat pump system CHP Formula (13): Q CHP =W CHP *COP c *η CHP (13) In the formula, Q CHP is the heating capacity of the ground source heat pump system (kW); W CHP is the cooling power of the heat pump (kW); COP C is the cooling COP of the heat pump, COP C The value range of η is 3.5~5.5; CHP is the working efficiency of the heat pump during cooling, η CHP The value range is 0.75~0.

95.

10. The multi-energy complementary system of combined cooling, heating and power based on biomass energy, solar energy and wind energy according to claim 1 is characterized by: The photovoltaic power generation system, wind power generation system, gas turbine, and ORC power generation system are all connected to the power storage system through electrical lines, and the power storage system is connected to the power grid through electrical lines; The solar collector, biomass boiler, heat exchanger, and ground source heat pump system are all connected to the heat collection tank via water pipes; The heat collecting tank is connected to the absorption refrigeration unit, the ground source heat pump system and the ORC power generation system through water pipes respectively.

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