A combined wind-solar-geothermal energy-based combined cooling, heating and power system and method

Abstract

The application discloses a combined wind-solar-geothermal energy CCHP system and method, wherein a hot network return water mother pipe is connected with a water side outlet of a flue gas heat exchange unit and a hot side inlet of an absorption heat pump unit respectively, the water side outlet of the flue gas heat exchange unit is connected with a water side inlet of the absorption heat pump unit, a hot side outlet of the absorption heat pump unit is connected with a hot network water supply mother pipe and a cooling tower inlet respectively, and a cooling tower outlet is connected with the hot side inlet of the absorption heat pump unit; a wind-solar energy unit hot side inlet and a cold water return water mother pipe are connected with a first inlet and outlet of the absorption heat pump unit, and a second inlet and outlet of the absorption heat pump unit are connected with a cold water supply mother pipe and a wind-solar energy unit hot side outlet respectively. The application realizes the step-by-step utilization of energy, improves the utilization rate of clean energy, reduces the energy supply cost and pollutant emission, has high energy distribution flexibility and strong decoupling, is good in adaptability to variable loads of distributed users, and solves the problems of strong wind-solar fluctuation and unstable energy supply power in the prior art.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of combined heat and power, and relates to a combined heat and power system and method combined with wind, light and geothermal energy. BACKGROUND

[0002] A distributed combined heat and power system containing clean energy can simultaneously supply power, refrigeration and heat based on the principle of energy cascade utilization, effectively reduces pollutant emissions and operating costs compared with a traditional fossil energy supply system, and is recognized as one of the important directions of future world energy technology development. A combined heat and power system composed of a power device and clean energy has become a new research hotspot. However, the application of wind, light and geothermal energy in the current process is limited by technology. Wind and light have strong volatility and unstable power supply, and the extractable heat of geothermal energy decreases year by year as the operation time increases. How to efficiently couple these clean energy and power devices to establish an energy-saving and emission-reducing, flexible and practical combined heat and power system is the primary problem to be solved at present. SUMMARY

[0003] The application aims to solve the problems of strong volatility of wind and light, unstable power supply, large functional volatility of clean energy and low coupling degree with power devices in the prior art, and provides a combined heat and power system and method combined with wind, light and geothermal energy.

[0004] To achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0005] A combined heat and power system combined with wind, light and geothermal energy comprises a flue gas treatment unit, a flue gas heat exchange unit, an absorption heat pump unit, a cooling tower, a wind and light energy unit, a heat network return water main pipe, a heat network water supply main pipe, a cold water return water main pipe and a cold water water supply main pipe.

[0006] The flue gas outlet of the flue gas treatment unit is connected to the flue gas inlet of the flue gas heat exchange unit, and the heat network return water main pipe is connected to the water side outlet of the flue gas heat exchange unit and the hot side inlet of the absorption heat pump unit.

[0007] The water side outlet of the flue gas heat exchange unit is connected to the heat network water supply main pipe and the water side inlet of the absorption heat pump unit, and the water side outlet of the absorption heat pump unit is connected to the water side inlet of the flue gas heat exchange unit. The hot side outlet of the absorption heat pump unit is connected to the heat network water supply main pipe and the inlet of the cooling tower, and the outlet of the cooling tower is connected to the hot side inlet of the absorption heat pump unit.

[0008] The hot side inlet of the wind and light energy unit and the cold water return water main pipe are connected to the first inlet and outlet of the low-temperature side of the absorption heat pump unit, and the second inlet and outlet of the low-temperature side of the absorption heat pump unit are connected to the cold water water supply main pipe and the hot side outlet of the wind and light energy unit.

[0009] The further improvement of the present application is that:

[0010] The wind and light energy unit comprises a solar photovoltaic panel, a wind heat generator and a soil source ground pipe;

[0011] The low-temperature side first inlet and outlet of the absorption heat pump unit, the outlet of the solar photovoltaic panel and the outlet of the wind heat generator are connected with the inlet of the soil source ground pipe, and the outlet of the soil source ground pipe is connected with the inlet of the wind heat generator, the inlet of the solar photovoltaic panel and the low-temperature side second inlet and outlet of the absorption heat pump unit respectively.

[0012] The outlet of the solar photovoltaic panel and the low-temperature side first inlet and outlet of the absorption heat pump unit are provided with a low-temperature heat source circulating pump, and the outlet of the wind heat generator and the inlet of the soil source ground pipe are provided with a soil source circulating pump.

[0013] The outlet of the soil source ground pipe is provided with a filter.

[0014] The absorption heat pump unit comprises a generator, a solution heat exchanger, an absorber, an evaporator and a condenser;

[0015] The water side outlet of the flue gas heat exchange unit is connected with the water side inlet of the generator, the water side outlet of the generator and the water side inlet of the flue gas heat exchange unit in sequence; the solution outlet of the generator is connected with the first solution inlet of the solution heat exchanger, the solution inlet of the absorber, the second solution inlet of the heat exchanger and the solution inlet of the generator in sequence, and the steam outlet of the generator is connected with the steam inlet of the condenser;

[0016] The heat network return water main pipe is connected with the hot side inlet of the absorber and the hot side inlet of the condenser in sequence, the hot side outlet of the condenser is connected with the heat network water supply main pipe and the inlet of the cooling tower respectively, the outlet of the cooling tower is connected with the hot side inlet of the absorber, the condensate water outlet of the condenser is connected with the condensate water inlet of the high-temperature side of the evaporator, the steam outlet of the high-temperature side of the evaporator is connected with the steam inlet of the absorber, the first inlet and outlet of the low-temperature side of the evaporator is connected with the outlet of the solar photovoltaic panel, the outlet of the wind heat generator and the inlet of the soil source ground pipe respectively, the second inlet and outlet of the low-temperature side of the evaporator is connected with the inlet of the wind heat generator, the inlet of the solar photovoltaic panel and the outlet of the soil source ground pipe respectively, and the cold water return water main pipe is connected with the cold water return water main pipe through the first inlet and outlet and the second inlet and outlet of the low-temperature side of the evaporator.

[0017] The flue gas heat exchange unit comprises a waste heat boiler and a flue gas heat exchanger;

[0018] The flue gas inlet of the waste heat boiler is connected with the flue gas outlet of the flue gas treatment unit, the flue gas outlet of the waste heat boiler is connected with the flue gas inlet of the flue gas heat exchanger, the water side inlet of the flue gas heat exchanger and the water side inlet of the waste heat boiler are connected in sequence with the water return main pipe of the heat supply network, and the water side outlet of the waste heat boiler is connected with the water side inlet of the generator and the water side inlet of the heat supply network respectively.

[0019] The flue gas treatment unit comprises a compressor, a regenerator, a combustion chamber, a turbine and a motor.

[0020] The flue gas outlet of the compressor is connected with the first side flue gas inlet of the regenerator, the combustion chamber and the flue gas inlet of the turbine in sequence, and the flue gas outlet of the turbine is connected with the second side flue gas inlet of the regenerator and the flue gas inlet of the flue gas heat exchanger in sequence.

[0021] The compressor, the turbine and the motor are coaxially arranged.

[0022] The outlet of the cooling tower is provided with a cooling water circulating pump.

[0023] The water return main pipe of the heat supply network is provided with a heat supply network circulating water pump.

[0024] A combined wind-solar-geothermal energy CCHP method comprises the following steps:

[0025] During heat supply, the flue gas of the flue gas treatment unit and the heat supply network circulating water of the water return main pipe are divided into two paths, the first path enters the flue gas heat exchanger, in the flue gas heat exchanger, the heat-absorbed heat supply network water is divided into two paths, one path is directly supplied to the heat supply network water supply main pipe, and the other path is used as a driving heat source and enters the absorption heat pump unit; the second path of the heat supply network water directly enters the absorption heat pump unit, is heat-absorbed and is then collected to the heat supply network water supply main pipe, the circulating water at the low-temperature side of the absorption heat pump unit enters the wind-solar energy unit, extracts the heat source of the wind-solar energy unit and then returns to the absorption heat pump unit to heat the circulating water, and the system is used for heat supply.

[0026] During cooling, the chilled water of the cold water return main pipe enters the absorption heat pump unit, is heat-absorbed, is then collected to the cold water supply main pipe and is used for external cooling, the heat-absorbed circulating water in the absorption heat pump unit enters the cooling tower for spraying and cooling and then returns to the absorption heat pump unit, and the wind-solar energy unit is used for heat storage of clean energy by delivering heat to the soil.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] The application discloses a combined wind-solar-geothermal energy cold-heat-power supply system, which is composed of a flue gas treatment unit, a flue gas heat exchange unit and a wind-solar energy unit.

[0029] Further, the wind-solar energy unit in the application comprises a solar photovoltaic panel, a wind heat generator and a soil source ground buried pipe, can realize efficient coupling of the solar photovoltaic panel and the wind heat generator, overcome the phenomenon of insufficient function caused by wind and light fluctuation, develop geothermal energy resources to supplement heat, improve the temperature of the low-temperature heat source, improve the heating performance coefficient of the heat pump, and realize cascade utilization of the wind-solar energy. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0031] Figure 1 The structure of the application is shown in the figure;

[0032] Wherein: 1-compressor; 2-heat regenerator; 3-combustion chamber; 4-turbine; 5-generator; 6-heat recovery boiler; 7-flue gas heat exchanger; 8-heating network circulating water pump; 9-first electric regulating valve; 10-first ball valve; 11-second ball valve; 12-second electric regulating valve; 13-third ball valve; 14-fourth ball valve; 15-third electric regulating valve; 16-fifth ball valve; 17-sixth ball valve; 18-fourth electric regulating valve; 19-seventh ball valve; 20-generator; 21-solution pump; 22-expansion valve; 23-solution heat exchanger; 24-absorber; 25-evaporator; 26-expansion valve; 27-condenser; 28-eighth ball valve; 29-cooling water circulating pump; 30-cooling tower; 31-ninth ball valve; 32-tenth ball valve; 33-eleventh ball valve; 34-twelfth ball valve; 35-low-temperature heat source circulating pump; 36-thirteenth ball valve; 37-solar photovoltaic panel; 38-fifth electric regulating valve; 39-fourteenth ball valve; 40-fifteenth ball valve; 41-sixteenth ball valve; 42-seventeenth ball valve; 43-wind heater; 44-sixth electric regulating valve; 45-eighteenth ball valve; 46-nineteenth ball valve; 47-twentieth ball valve; 48-soil source circulating pump; 49-soil source ground heat exchanger; 50-seventh electric regulating valve; 51-filter; 52-twenty-first ball valve. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0035] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, thus, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0036] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship of the product of the present application when it is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0037] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0038] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The present application will be further described in detail below in conjunction with the drawings:

[0040] Reference is made to Figure 1The application discloses a combined wind, light and geothermal energy CCHP system, when the user side load demand is heat and electricity load, the waste heat of flue gas is recovered by a waste heat recovery system to directly supply heat and drive an absorption heat pump, the absorption heat pump extracts low-grade heat energy from a clean energy utilization system to supply heat, the clean energy utilization system is composed of a solar heat collector, a wind heat generator and a geothermal well, and mainly uses wind and light resources to generate heat, and the geothermal energy supplements the low-grade heat energy, the above system realizes combined heat and power supply, when the user side load demand is cold and electricity load, the absorption heat pump unit is driven by the waste heat of flue gas, at this time, the low-temperature heat source of the absorption heat pump unit becomes chilled circulating water for user cooling, and the high-temperature heat source is a cooling tower, heat is transferred to the cooling tower to be dissipated to cool the chilled water, and the combined wind, light and geothermal energy CCHP system realizes combined cold and power supply. In addition, the solar heat collector and the wind heat generator are combined to carry out heat recharge to the geothermal well during the cold and power supply period, so that the soil temperature is maintained and improved, and the wind and light clean energy storage and utilization are realized. The clean energy utilization system can realize efficient coupling of wind and light resources with complementary fluctuation characteristics, and develop geothermal energy resources to supplement heat, improve the low-temperature heat source temperature, and improve the heat pump heating performance coefficient. The combined wind, light and geothermal energy CCHP system realizes energy cascade utilization and clean energy deep development and utilization, improves the energy utilization rate, and reduces the energy supply cost and pollutant emission.

[0041] The system disclosed by the embodiment of the application specifically comprises:

[0042] 1- compressor; 2- regenerator; 3- combustion chamber; 4- turbine; 5- generator; 6- waste heat boiler; 7- flue gas heat exchanger; 8- heat network circulating water pump; 9- first electric regulating valve; 10- first ball valve; 11- second ball valve; 12- second electric regulating valve; 13- third ball valve; 14- fourth ball valve; 15- third electric regulating valve; 16- fifth ball valve; 17- sixth ball valve; 18- fourth electric regulating valve; 19- seventh ball valve; 20- generator; 21- solution pump; 22- expansion valve; 23- solution heat exchanger; 24- absorber; 25- evaporator; 26- expansion valve; 27- condenser; 28- eighth ball valve; 29- cooling water circulating pump; 30- cooling tower; 31- ninth ball valve; 32- tenth ball valve; 33- eleventh ball valve; 34- twelfth ball valve; 35- low-temperature heat source circulating pump; 36- thirteenth ball valve; 37- solar photovoltaic panel; 38- fifth electric regulating valve; 39- fourteenth ball valve; 40- fifteenth ball valve; 41- sixteenth ball valve; 42- seventeenth ball valve; 43- wind heat generator; 44- sixth electric regulating valve; 45- eighteenth ball valve; 46- nineteenth ball valve; 47- twentieth ball valve; 48- soil source circulating pump; 49- soil source ground buried pipe; 50- seventh electric regulating valve; 51- filter; 52- twenty-first ball valve

[0043] The flue gas enters the compressor 1, the flue gas outlet of the compressor 1 is connected to the first side flue gas inlet of the regenerator 2, the first side flue gas outlet of the regenerator 2 is connected to the flue gas inlet of the combustion chamber 3, the flue gas outlet of the combustion chamber 3 is connected to the flue gas inlet of the turbine 4, the flue gas inlet of the turbine 4 enters the waste heat boiler 6 through the second side flue gas inlet and the second side flue gas outlet of the regenerator 2 in sequence; the compressor 1, the turbine 4 and the generator 5 are coaxially arranged.

[0044] The flue gas outlet of the waste heat boiler 6 is connected to the flue gas inlet of the flue gas heat exchanger 7, and the hot water network return water main pipe is divided into two paths.

[0045] The first path of the hot water network water is connected to the water side inlet of the flue gas heat exchanger 7 and the water side inlet of the waste heat boiler 6 in sequence, the water side outlet of the waste heat boiler 6 is divided into two paths, one path is connected to the hot water network water supply main pipe, and the other path is connected to the water side inlet of the generator 20, and then returns to the waste heat boiler 6 through the water side outlet of the generator 20, so that the driving circulation of the hot water network water is realized, and the flue gas in the waste heat boiler 6 is discharged through the flue gas outlet after heat exchange; the tail flue gas waste heat of the gas turbine power generation is recovered in the embodiment of the application, and is used for driving the absorption heat pump unit to realize cooling or heating, so that the energy cascade utilization is realized.

[0046] The second path enters the hot side inlet of the absorber 24, the hot side outlet of the absorber 24 is connected to the hot side inlet of the condenser 27, the hot side outlet of the condenser 27 is divided into two paths, one path is connected to the hot water network water supply main pipe, and the other path is connected to the inlet of the cooling tower 30, and the outlet of the cooling tower 30 is connected to the hot side outlet of the absorber 24.

[0047] The wind and light energy unit as a low-temperature heat source includes a solar photovoltaic panel 37, a wind heater 43 and a soil source ground buried pipe 49, the hot side inlet of the soil source ground buried pipe 49 and the low-temperature side first outlet of the evaporator 25 are connected, the hot side outlet of the soil source ground buried pipe 49 is connected to the low-temperature side second outlet of the evaporator 25, two branches are arranged on the connecting pipeline of the soil source ground buried pipe 49 and the evaporator 25, and the solar photovoltaic panel 37 and the wind heater 43 are arranged in the two branches respectively, wherein the outlet of the solar photovoltaic panel 37 and the outlet of the wind heater 43 are connected to the hot side inlet of the soil source ground buried pipe 49, and the hot side outlet of the soil source ground buried pipe 49 is connected to the inlet of the solar photovoltaic panel 37 and the inlet of the wind heater 43 respectively.

[0048] The cold water main pipe is connected to the first outlet of the low-temperature side of the evaporator 25, and the second outlet of the low-temperature side of the evaporator 25 is connected to the cold water supply main pipe.

[0049] The connection structure of the absorption heat pump unit: the solution in the generator 20 absorbs the heat of the heat network circulating water and becomes a concentrated solution, which enters the solution first side solution inlet of the solution heat exchanger 23 through the solution outlet of the generator 20 and the expansion valve 22 after pressure reduction, and becomes a concentrated solution after heat exchange with the dilute solution, enters the absorber 24, absorbs the low-temperature water vapor from the evaporator 25, and becomes a dilute solution, and the dilute solution enters the solution heat exchanger 23 again through the second side solution inlet of the solution heat exchanger 23 to exchange heat, absorbs the heat of the concentrated solution, and returns to the generator 20 through the solution pump 21 after pressure increase; The steam generated by the solution heat exchange in the generator 20 enters the condenser 27, is condensed and releases heat in the condenser 27, and the generated condensate enters the evaporator 25 through the expansion valve 26, absorbs the heat of the low-temperature heat source in the evaporator 25, and the generated water vapor enters the absorber 24.

[0050] When heating:

[0051] The hot water of the heat network return water main pipe passes through the heat network circulating water pump 8 and is divided into two paths, the heat network circulating water first path passes through the second ball valve 11 and the first electric regulating valve 9 in turn, enters the flue gas heat exchanger 7, and then enters the waste heat boiler 6 through the first ball valve 10. After absorbing the heat of the flue gas, it is divided into two paths, one path passes through the third electric regulating valve 15 and the fifth electric regulating valve 16 and is collected to the heat network water supply main pipe to realize water supply, and the other path enters the generator 20 as a driven heat source and returns to the waste heat boiler 6 after heat exchange; The second path of the heat network circulating water passes through the sixth ball valve 17 and the fourth electric regulating valve 18 and enters the hot side inlet of the absorber 24, and then passes through the seventh ball valve 19 to the heat network water supply main pipe after absorbing heat in the generator 24 and the condenser 27. The low-temperature heat source of the absorption heat pump unit comes from the wind and light energy unit, and the main heating mode is:

[0052] When solar energy is abundant, the twentieth ball valve 47 and the twenty-first ball valve 52 are closed, while the sixteenth ball valve 41, the nineteenth ball valve 46, the twelfth ball valve 34, the thirteenth ball valve 36, the fourteenth ball valve 39, the seventeenth ball valve 42, the fifteenth ball valve 40, and the eighteenth ball valve 45 are opened. The low-temperature circulating water from the evaporator 25, after being pressurized by the low-temperature heat source circulating pump 35, is divided into two streams and enters the solar photovoltaic panel 37 and the wind-powered heater 43 respectively. The flow distribution is regulated by the fifth electric regulating valve 38 and the sixth electric regulating valve 44. After heating, the water is combined and sent back to the evaporator 25 to extract low-grade heat energy. When there is insufficient sunlight, the thirteenth ball valve 36 and the fourteenth ball valve 39 are closed. The low-temperature circulating water of the evaporator 25 is pressurized by the low-temperature heat source circulation pump 35 and sent to the wind-powered heater 43 and the soil source buried pipe 49 respectively. The circulating water entering the soil source buried pipe 49 is pressurized a second time by the soil source circulation pump 48. The sixth electric regulating valve 44 and the seventh electric regulating valve 50 regulate the flow distribution of the two paths. Then, the water is combined and sent back to the low-temperature side of the evaporator 25 to extract low-grade heat energy. The wind and solar energy unit uses the system as a low-temperature heat source for the absorption heat pump unit. The wind heater 43 uses wind energy to heat the closed-loop circulating water, and the solar photovoltaic panel 37 uses solar energy to heat the closed-loop circulating water. Together, they supply low-grade heat energy to the absorption heat pump unit. When wind and solar resources are insufficient, the soil source buried pipe 49 is used to extract heat from the soil as a supplement. The absorption heat pump unit is driven by the circulating water to extract low-grade heat provided by the wind and solar energy unit to heat the circulating water of the heating network to achieve external heating.

[0053] When cooling:

[0054] While the gas turbine generates electricity, the waste heat from the flue gas is used to produce hot water via waste heat boiler 6 and flue gas heat exchanger 7. The hot water drives an absorption heat pump unit for cooling. At this time, the low-temperature heat source of the absorption heat pump unit switches to the chilled water circulation loop for cooling, and the high-temperature heat source switches to the cooling tower loop. The chilled water return enters the evaporator 25 for heat exchange. The absorption heat pump unit transfers the heat extracted by cooling the chilled water return to the cooling tower 30 for heat dissipation, thus achieving combined cooling and power generation together with the gas turbine. In addition, in the wind and solar energy unit, the twelfth ball valve 34 The fifteenth ball valve 40 is closed, and the solar photovoltaic panel 37 and wind heater 43 are used to store heat in the soil. The circulating water in the soil source buried pipe 49 is filtered by 51 and then enters the solar photovoltaic panel 37 and wind heater 43 in two separate streams. The flow distribution of the two loops is regulated by two electric regulating valves, the fifth electric regulating valve 38 and the sixth electric regulating valve 44. After being heated, the circulating water in the two loops merges and is pressurized by the soil source circulation pump 48 before being sent back to the soil source buried pipe 49, releasing heat into the underground soil for storage. The wind and solar energy unit utilizes the heat generated by the solar photovoltaic panel 37 and wind heater 43 to inject heat into the soil through geothermal wells, realizing cross-time or cross-seasonal heat storage of clean energy, improving the low-temperature heat source temperature and clean energy utilization rate of the heating mode.

[0055] Compared with the prior art, the embodiment of the present application effectively couples the clean energy with complementary fluctuation characteristics of wind and light, uses geothermal energy as a basis guarantee and supplement, provides a higher and reliable low-temperature heat source, improves the heating performance coefficient, reduces the energy cost and pollutant emission; meanwhile, the clean energy utilization system established in the non-heating mode uses wind and light resources to heat and store heat in the soil, realizes cross-period or cross-season heat storage, and improves the clean energy utilization rate; the heat and power cogeneration system established has high flexibility of heat and power load or cold and power load distribution, strong decoupling, and good adaptability to variable loads of distributed users.

[0056] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A combined wind-solar-geothermal energy CCHP system, characterized in that, The system comprises a flue gas treatment unit, a flue gas heat exchange unit, an absorption heat pump unit, a cooling tower (30), a wind and light energy unit, a heat network return water main pipe, a heat network supply water main pipe, a cold water return water main pipe and a cold water supply water main pipe; The flue gas outlet of the flue gas treatment unit is connected with the flue gas inlet of the flue gas heat exchange unit, and the heat network return water main pipe is connected with the water side outlet of the flue gas heat exchange unit and the heat side inlet of the absorption heat pump unit respectively; The water side outlet of the flue gas heat exchange unit is connected with the heat network supply water main pipe and the water side inlet of the absorption heat pump unit respectively, and the water side outlet of the absorption heat pump unit is connected with the water side inlet of the flue gas heat exchange unit; the heat side outlet of the absorption heat pump unit is connected with the heat network supply water main pipe and the inlet of the cooling tower (30), and the outlet of the cooling tower (30) is connected with the heat side inlet of the absorption heat pump unit; The heat side inlet of the wind and light energy unit and the cold water return water main pipe are connected with the first inlet and outlet of the low temperature side of the absorption heat pump unit, and the second inlet and outlet of the low temperature side of the absorption heat pump unit are connected with the cold water supply water main pipe and the heat side outlet of the wind and light energy unit respectively; The wind and light energy unit comprises a solar photovoltaic panel (37), a wind driven heater (43) and a soil source ground buried pipe (49); The first inlet and outlet of the low temperature side of the absorption heat pump unit, the outlet of the solar photovoltaic panel (37) and the outlet of the wind driven heater (43) are connected with the inlet of the soil source ground buried pipe (49), and the outlet of the soil source ground buried pipe (49) is connected with the inlet of the wind driven heater (43), the inlet of the solar photovoltaic panel (37) and the second inlet and outlet of the low temperature side of the absorption heat pump unit respectively; A low temperature heat source circulating pump (35) is arranged between the outlet of the solar photovoltaic panel (37) and the first inlet and outlet of the low temperature side of the absorption heat pump unit, and a soil source circulating pump (48) is arranged between the outlet of the wind driven heater (43) and the inlet of the soil source ground pipe (49); A filter (51) is arranged at the outlet of the soil source ground pipe (49); The absorption heat pump unit comprises a generator (20), a solution heat exchanger (23), an absorber (24), an evaporator (25) and a condenser (27); The water side outlet of the flue gas heat exchange unit is connected with the water side inlet of the generator (20), the water side outlet of the generator (20) and the water side inlet of the flue gas heat exchange unit in sequence; the solution outlet of the generator (20) is connected with the first solution inlet of the solution heat exchanger (23), the solution inlet of the absorber (24), the second solution inlet of the heat exchanger (23) and the solution inlet of the generator (20) in sequence, and the steam outlet of the generator (20) is connected with the steam inlet of the condenser (27); The hot network backwater main pipe is connected with the hot side inlet of the absorber (24) and the hot side inlet of the condenser (27) in sequence, the hot side outlet of the condenser (27) is connected with the hot network water supply main pipe and the inlet of the cooling tower (30) respectively, and the outlet of the cooling tower (30) is connected with the hot side inlet of the absorber (24); the condenser water outlet of the condenser (27) is connected with the condenser water inlet of the high-temperature side of the evaporator (25), and the steam outlet of the high-temperature side of the evaporator (25) is connected with the steam inlet of the absorber (24); the first outlet of the low-temperature side of the evaporator (25) is connected with the outlet of the solar photovoltaic panel (37), the outlet of the wind heater (43) and the inlet of the soil source ground pipe (49) respectively, and the second outlet of the low-temperature side of the evaporator (25) is connected with the inlet of the wind heater (43), the inlet of the solar photovoltaic panel (37) and the outlet of the soil source ground pipe (49) respectively; the cold water backwater main pipe is connected with the cold water backwater main pipe through the first outlet and the second outlet of the low-temperature side of the evaporator (25); The flue gas heat exchange unit comprises a waste heat boiler (6) and a flue gas heat exchanger (7); The flue gas inlet of the waste heat boiler (6) is connected with the flue gas outlet of the flue gas treatment unit, the flue gas outlet of the waste heat boiler (6) is connected with the flue gas inlet of the flue gas heat exchanger (7), the hot network backwater main pipe is connected with the water side inlet of the flue gas heat exchanger (7) and the water side inlet of the waste heat boiler (6) in sequence, and the water side outlet of the waste heat boiler (6) is connected with the hot network water supply main pipe and the water side inlet of the generator (20) respectively, and the water side outlet of the generator (20) is connected with the water side inlet of the waste heat boiler (6); The flue gas treatment unit comprises a compressor (1), a regenerator (2), a combustion chamber (3), a turbine (4) and a motor (5); The flue gas outlet of the compressor (1) is connected with the first side flue gas inlet of the regenerator (2), the combustion chamber (3) and the flue gas inlet of the turbine (4) in sequence, the flue gas outlet of the turbine (4) is connected with the second side flue gas inlet of the regenerator (2) and the flue gas inlet of the flue gas heat exchange unit in sequence; The compressor (1), the turbine (4) and the motor (5) are coaxially arranged; The outlet of the cooling tower (30) is provided with a cooling water circulating pump (29); The hot network backwater main pipe is provided with a hot network circulating water pump (8); The cold heat and power cogeneration system comprises the following steps: During heating, the flue gas of the flue gas treatment unit and the hot network circulating water of the hot network backwater main pipe are divided into two paths, the first path enters the flue gas heat exchange unit, in the flue gas heat exchange unit, the heat-absorbed hot network water is divided into two paths, one path is directly supplied to the hot network water supply main pipe for heating, and the other path is used as a driving heat source to enter the absorption heat pump unit; the second path of the hot network water directly enters the absorption heat pump unit, is heated and then is collected to the hot network water supply main pipe, and the circulating water of the low-temperature side of the absorption heat pump unit enters the wind-solar energy unit, extracts the heat source of the wind-solar energy unit and then returns to the absorption heat pump unit to heat the circulating water, which is used for system heating; When cooling, the chilled water of the chilled water return main pipe enters the absorption heat pump unit, is absorbed after heat absorption, and is converged to the chilled water supply main pipe to supply coldness outside. The circulating water in the absorption heat pump unit after heat absorption enters the cooling tower (30) to spray and cool, and returns to the absorption heat pump unit. The wind and light energy unit delivers heat to the soil, which is used for heat storage of clean energy. The working method of the wind heat generator includes: the twelfth ball valve (34) and the fifteenth ball valve (40) are closed, the soil is stored by the solar photovoltaic panel (37) and the wind heat generator (43), the circulating water in the soil source ground buried pipe (49) is filtered by the filter (51) and then enters the solar photovoltaic panel (37) and the wind heat generator (43) in two ways, the two electric regulating valves of the fifth electric regulating valve (38) and the sixth electric regulating valve (44) are used to adjust the two loop flow distribution, the two loop circulating waters are converged after being heated by the soil source circulating pump (48) to increase the pressure, and then are sent back to the soil source ground buried pipe (49) to release heat to the underground soil for storage; the wind and light energy unit uses the heating capacity of the solar photovoltaic panel (37) and the wind heat generator (43) to pour into the soil through the geothermal well.

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