Heating system based on complementary utilization of multiple clean energy sources and its operation method

Abstract

The present invention relates to a heating system based on the complementary utilization of multiple clean energy sources and an operation method thereof. The system includes: an electrically driven heat pump, a wind-heat unit, a cross-seasonal buried pipe heat storage unit, a waste heat heating unit, an electric boiler heating unit, and a water supply main pipe. The water inlet of the heat absorption side of the electrically driven heat pump is connected to the return water of the primary network, and the water outlet of the heat absorption side of the electrically driven heat pump is connected to the heat network water inlet of the wind-heat unit. The heat network water inlet of the cross-seasonal buried pipe heat storage unit is connected to the heat network water outlet of the wind-heat unit, or the heat network water inlet of the cross-seasonal buried pipe heat storage unit is connected to the water outlet of the heat absorption side of the electrically driven heat pump. The technical solution of the present invention enables the return water of the primary network in a wider temperature range to enter the system, improves the application range of the system; improves the stability of renewable energy heating, and realizes the full utilization of energy, thereby improving the energy utilization efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of complementary clean heating, and particularly to a heating system based on the complementary utilization of multiple clean energies and its operation method. Background Art

[0002] At present, there are mainly two problems to be solved in the clean heating coupled with renewable energy. First, there is a problem of insufficient heating stability in renewable energy heating. The heating of renewable energies such as wind and light is restricted by factors such as weather, region, and season, and has characteristics such as intermittency, instability, and seasonality. When using a single clean energy for heating, there will be problems such as uneven distribution of clean energy in space and time, unstable input, and the system being easily affected by objective factors, making it difficult to be the main heat source for centralized heating. Therefore, how to utilize various types of renewable energies to construct a multi-energy complementary heating system, while taking into account clean heating, and achieving stable and reliable operation of the system is one of the key problems that need to be solved urgently by technicians in the field of centralized heating. Summary of the Invention

[0003] The purpose of the present invention is to provide a heating system based on the complementary utilization of multiple clean energies, enabling the return water of the primary network in a wider temperature range to flow into the system, expanding the application range of the system; improving the stability of renewable energy heating, and achieving the full utilization of energy, thereby improving the energy utilization efficiency.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A heating system based on the complementary utilization of multiple clean energies includes: an electric-driven heat pump, a wind-heat unit, a cross-seasonal buried pipe heat storage unit, a waste heat heating unit, an electric boiler heating unit, and a water supply main pipe.

[0006] The heat source water outlet of the waste heat heating unit is connected to the water inlet of the cross-seasonal buried pipe heat storage unit, and the water outlet of the cross-seasonal buried pipe heat storage unit is connected to the heat source water inlet of the waste heat heating unit.

[0007] The water inlet on the heat absorption side of the electric-driven heat pump is connected to the return water of the primary network. The water outlet on the heat absorption side of the electric-driven heat pump is connected to the heat network water inlet of the wind-heat unit. The heat network water inlet of the cross-seasonal buried pipe heat storage unit is connected to the heat network water outlet of the wind-heat unit, or the heat network water inlet of the cross-seasonal buried pipe heat storage unit is connected to the water outlet on the heat absorption side of the electric-driven heat pump.

[0008] The hot water outlet of the cross-seasonal buried pipe heat storage unit is connected to the hot water inlet of the waste heat heating unit, and the hot water outlet of the waste heat heating unit is connected to the hot water inlet of the electric boiler heating unit; the hot water outlet of the cross-seasonal buried pipe heat storage unit is connected to the hot water inlet of the air heating unit, and the hot water outlet of the air heating unit is connected to the hot water inlet of the electric boiler heating unit; the hot water outlet of the cross-seasonal buried pipe heat storage unit is connected to the heat release side water inlet of the electric-driven heat pump, the heat release side water outlet of the electric-driven heat pump is connected to the hot water inlet of the electric boiler heating unit, and the hot water outlet of the electric boiler heating unit is connected to the water inlet of the water supply main pipe.

[0009] Preferably, the air heating unit includes a fan impeller, a gearbox, a compressor, a condenser, an expansion valve and an evaporator;

[0010] The heat absorption side water outlet of the electric-driven heat pump is connected to the hot water inlet of the evaporator, the hot water outlet of the evaporator is connected to the hot water inlet of the cross-seasonal buried pipe heat storage unit, the hot water outlet of the cross-seasonal buried pipe heat storage unit is connected to the hot water inlet of the condenser, and the hot water outlet of the condenser is connected to the hot water inlet of the electric boiler heating unit;

[0011] The fan impeller is fixedly connected to the compressor through the gearbox, the refrigerant outlet of the compressor is connected to the refrigerant inlet of the condenser, the refrigerant outlet of the condenser is connected to the expansion valve inlet, the expansion valve outlet is connected to the refrigerant inlet of the evaporator, and the refrigerant outlet of the evaporator is connected to the refrigerant inlet of the compressor.

[0012] Preferably, the cross-seasonal buried pipe heat storage unit includes a ground source heat pump, a ground buried pipe circulation pump and a ground buried pipe heat exchanger;

[0013] The heat absorption side water outlet of the electric-driven heat pump is connected to the hot water inlet of the ground source heat pump, or the hot water outlet of the air heating unit is connected to the hot water inlet of the ground source heat pump. The hot water outlet of the ground source heat pump is respectively connected to the hot water inlet of the waste heat heating unit, the hot water inlet of the air heating unit and the heat release side water inlet of the electric-driven heat pump;

[0014] The heat source water outlet of the ground buried pipe circulation pump is connected to the heat source water inlet of the ground source heat pump, the heat source water outlet of the ground source heat pump is connected to the heat source water inlet of the ground buried pipe circulation pump, and the heat source water inlet of the ground buried pipe circulation pump is equipped with the ground buried pipe circulation pump;

[0015] The heat source water outlet of the waste heat heating unit is connected to the heat source water inlet of the buried pipe heat exchanger, and the heat source water outlet of the buried pipe heat exchanger is connected to the heat source water inlet of the waste heat heating unit.

[0016] Preferably, the waste heat heating unit includes a waste heat circulation pump, a waste heat heat source, and a waste heat heat exchanger;

[0017] The heat network water outlet of the seasonal heat storage buried pipe unit is connected to the heat network water inlet of the waste heat heat exchanger, and the heat network water outlet of the waste heat heat exchanger is connected to the heat network water inlet of the electric boiler heating unit;

[0018] The heat source water outlet of the waste heat heat source is connected to the heat source water inlet of the waste heat heat exchanger, the heat source water outlet of the waste heat heat exchanger is connected to the heat source water inlet of the waste heat heat source, and the waste heat circulation pump is installed at the heat source water inlet of the waste heat heat source;

[0019] The heat source water outlet of the waste heat heat source is connected to the inlet of the seasonal heat storage buried pipe unit, and the outlet of the seasonal heat storage buried pipe unit is connected to the heat source water inlet of the waste heat heat source.

[0020] Preferably, the electric boiler heating unit includes an electric boiler, the heat release side outlet of the electric driven heat pump, the heat network water outlet of the waste heat heating unit, and the heat network water outlet of the air heating unit are all connected to the heat network water inlet of the electric boiler, and the heat network water outlet of the electric boiler is connected to the inlet of the water supply main pipe.

[0021] Preferably, the heating system based on the complementary utilization of multiple clean energies further includes a heat network water bypass pipe. The heat network water outlet of the seasonal heat storage buried pipe unit is connected to the inlet of the heat network water bypass pipe, and the outlet of the heat network water bypass pipe is connected to the heat network water inlet of the electric boiler heating unit.

[0022] The present invention also provides a method for the heating system based on the complementary utilization of multiple clean energies, including the following steps:

[0023] Judge whether the system is operating in the heating season;

[0024] If it is not operating in the heating season, the electric driven heat pump, the air heating unit, and the electric boiler heating unit are all in a shutdown state, and the waste heat heating unit flows the heat source water into the seasonal heat storage buried pipe unit for heat storage;

[0025] If it is operating in the heating season, judge whether the wind power is sufficient;

[0026] If there is sufficient wind power during the heating season, the return water of the primary network enters the heat absorption side water inlet of the electric-driven heat pump and releases heat in the air-heat unit. After the temperature drops, the return water of the primary network enters the seasonal heat storage unit with buried pipes. The seasonal heat storage unit with buried pipes conducts primary heating on the return water of the primary network. Then, the return water of the primary network is passed into the air-heat unit and the waste heat heating unit for secondary heating. The return water of the primary network after secondary heating is passed into the electric boiler heating unit. The electric boiler heating unit conducts tertiary heating on the return water of the primary network. Finally, the return water of the primary network after tertiary heating is transmitted to the water supply main pipe; or, a part of the return water of the primary network after primary heating is passed into the heat release side of the electric-driven heat pump for heat absorption, and then the return water of the primary network heated by the electric-driven heat pump is passed into the electric boiler heating unit. Finally, the return water of the primary network is heated by the electric boiler heating unit and then transmitted to the water supply main pipe.

[0027] If there is insufficient wind power during the heating season, the return water of the primary network enters the heat absorption side of the electric-driven heat pump to release heat. After the temperature drops, the return water of the primary network enters the seasonal heat storage unit with buried pipes. The seasonal heat storage unit with buried pipes conducts primary heating on the return water of the primary network. Then, the return water of the primary network is passed into the waste heat heating unit for secondary heating. The return water of the primary network after secondary heating is passed into the electric boiler heating unit. The electric boiler heating unit conducts tertiary heating on the return water of the primary network. Finally, the return water of the primary network after tertiary heating is transmitted to the water supply main pipe; or, a part of the return water of the primary network after primary heating is passed into the heat release side of the electric-driven heat pump for heat absorption, and then the return water of the primary network heated by the electric-driven heat pump is passed into the electric boiler heating unit. Finally, the return water of the primary network is heated by the electric boiler heating unit and then transmitted to the water supply main pipe.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] A heating system based on the complementary utilization of multiple clean energies provided in the above technical solution integrates multiple renewable energy heat supplies through an electric-driven heat pump, a wind-heat unit, a cross-seasonal buried pipe heat storage unit, a waste heat heating unit, an electric boiler heating unit, and a water supply main pipe to form a multi-energy complementary clean heating system, enabling clean energy to be evenly distributed in space and time and serving as the main heat source for centralized heating. Secondly, the return water of the primary network is cooled by the electric-driven heat pump and then introduced into the cross-seasonal buried pipe heat storage unit, which has a good protective effect on the cross-seasonal buried pipe heat storage unit, reduces the total power consumption, is beneficial to improving the overall efficiency of the system, and also reduces the temperature requirement for the return water of the primary network entering the system, allowing the return water of the primary network in a wider temperature range to be introduced into the system, expanding the application scope of the system. In addition, during the heating season, the cross-seasonal buried pipe heat storage unit conducts primary heating on the return water of the primary network, the waste heat heating unit and the wind-heat unit conduct secondary heating on the return water of the primary network, and the electric boiler heating unit conducts tertiary heating on the return water of the primary network. Through the three-stage cascade heating system, the stability of renewable energy heating is improved, and the full utilization of energy is achieved, thereby enhancing the energy utilization efficiency. Brief Description of the Drawings

[0030] Figure 1 It is a schematic diagram of a heating system based on the complementary utilization of multiple clean energies in an embodiment of the present invention.

[0031] Description of the Reference Numerals in the Drawings:

[0032] 1. Fan impeller; 2. Gearbox; 3. Compressor; 4. Condenser; 5. Expansion valve; 6. Evaporator; 11. Valve II; 12. Electric-driven heat pump; 13. Valve III; 14. Valve IV; 15. Ground-source heat pump; 16. Ground buried pipe circulation pump; 17. Valve V; 18. Ground buried pipe heat exchanger; 19. Valve VI; 20. Valve VII; 21. Valve VIII; 31. Waste heat circulation pump; 32. Waste heat heat source; 33. Valve IX; 34. Valve X; 35. Waste heat heat exchanger; 36. Valve XI; 37. Valve XII; 38. Valve XIII; 39. Valve XIV; 40. Valve XV; 41. Valve XVI; 42. Electric boiler; 43. Valve XVII. Detailed Embodiment

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] In an embodiment of the present invention, a heating system based on the complementary utilization of multiple clean energies is provided. Multiple renewable energy heating methods are integrated to form a multi-energy complementary clean heating system, enabling clean energy to be evenly distributed in time and space and serving as the main heat source for central heating. Secondly, the return water of the primary network is cooled by the electric-driven heat pump 12 and then introduced into the seasonal heat storage unit with buried pipes, which has a good protective effect on the seasonal heat storage unit with buried pipes, reduces the total power consumption, is beneficial to improving the overall efficiency of the system, and also reduces the temperature requirement for the return water of the primary network entering the system, enabling the return water of the primary network in a wider temperature range to be introduced into the system, thereby expanding the application range of the system. In addition, during the heating season, the seasonal heat storage unit with buried pipes conducts primary heating on the return water of the primary network, the waste heat heating unit and the air-heat unit conduct secondary heating on the return water of the primary network, and the electric boiler 42 heating unit conducts tertiary heating on the return water of the primary network. Through the three-stage cascade heating system, the stability of renewable energy heating is improved, and the full utilization of energy is realized, thereby improving the energy utilization efficiency.

[0037] Please refer to Figure 1, in one embodiment, a heating system based on complementary utilization of multiple clean energy sources includes: an electric-driven heat pump 12, a wind-heat unit, a cross-seasonal buried-pipe heat storage unit, a waste heat heating unit, an electric boiler 42 heating unit, and a water supply main pipe. Among them, the electric boiler 42 heating unit includes an electric boiler 42. The cross-seasonal buried-pipe heat storage unit includes a ground-source heat pump 15, a ground-pipe circulation pump 16, and a ground-pipe heat exchanger 18. The waste heat heating unit includes a waste heat circulation pump 31, a waste heat heat source 32, and a waste heat heat exchanger 35; the waste heat heating unit is for the recovery and utilization of industrial waste heat. The wind-heat unit includes a fan impeller 1, a gearbox 2, a compressor 3, a condenser 4, an expansion valve 5, and an evaporator 6.

[0038] It should be noted that the cross-seasonal buried-pipe heat storage unit is for primary heating, the electric-driven heat pump 12, the wind-heat unit, and the waste heat heating unit can be in a parallel form for secondary heating, and the electric boiler 42 heating unit is for tertiary heating; the operation of this system is divided into two operation modes: waste heat storage in the non-heating season and cascade heating in the heating season.

[0039] Loop 1: The heat source water outlet of the waste heat heating unit is connected to the water inlet of the cross-seasonal buried-pipe heat storage unit, and the water outlet of the cross-seasonal buried-pipe heat storage unit is connected to the heat source water inlet of the waste heat heating unit; among them, the heat source water outlet of the waste heat heat source 32 is connected to the heat source water inlet of the ground-pipe heat exchanger 18, and the heat source water outlet of the ground-pipe heat exchanger 18 is connected to the heat source water inlet of the waste heat heat source 32.

[0040] When operating in the non-heating season, the waste heat heat source 32 and the ground-pipe heat exchanger 18 form a heat storage circulation loop, and the electric-driven heat pump 12, the wind-heat unit, and the electric boiler 42 heating unit are all in a shutdown state.

[0041] Specifically, open valve six 19, valve eight 21, valve nine 33, and the waste heat circulation pump 31, and close other valves. The working medium flows through the waste heat heat source 32, and the hot water of the waste heat heat source 32 is at 60 - 70 °C. This hot water flows into the ground-pipe heat exchanger 18 through valve nine 33 and valve eight 21, heats and stores heat in the soil and then the temperature decreases, and then flows back to the waste heat heat source 32 through valve six 19, forming a cycle to store heat in the ground-pipe heat exchanger 18. In the heating season, the heat stored in the ground-pipe heat exchanger 18 is released through the ground-source heat pump 15, which can conduct primary heating on the return water of the primary network, realizing the full-time-scale and full utilization of waste heat resources, improving the energy utilization efficiency, and thus reducing the heating cost.

[0042] Circuit Two: Branch One. The water inlet of the heat absorption side of the electric-driven heat pump 12 is connected to the return water of the primary network. The water outlet of the heat absorption side of the electric-driven heat pump 12 is connected to the heat network water inlet of the evaporator 6. The heat network water outlet of the evaporator 6 is connected to the heat network water inlet of the ground-source heat pump 15. The heat network water outlet of the ground-source heat pump 15 is connected to the heat network water inlet of the waste heat heat exchanger 35. The heat network water outlet of the waste heat heat exchanger 35 is connected to the heat network water inlet of the electric boiler 42. The heat network water outlet of the electric boiler 42 is connected to the water inlet of the water supply main pipe.

[0043] Branch Two. The water inlet of the heat absorption side of the electric-driven heat pump 12 is connected to the return water of the primary network. The water outlet of the heat absorption side of the electric-driven heat pump 12 is connected to the heat network water inlet of the evaporator 6. The heat network water outlet of the evaporator 6 is connected to the heat network water inlet of the ground-source heat pump 15. The heat network water outlet of the ground-source heat pump 15 is connected to the heat network water inlet of the condenser 4. The heat network water outlet of the condenser 4 is connected to the heat network water inlet of the electric boiler 42. The heat network water outlet of the electric boiler 42 is connected to the water inlet of the water supply main pipe.

[0044] Branch Three. The water inlet of the heat absorption side of the electric-driven heat pump 12 is connected to the return water of the primary network. The water outlet of the heat absorption side of the electric-driven heat pump 12 is connected to the heat network water inlet of the evaporator 6. The heat network water outlet of the evaporator 6 is connected to the heat network water inlet of the ground-source heat pump 15. The heat network water outlet of the ground-source heat pump 15 is connected to the water inlet of the heat release side of the electric-driven heat pump 12. The water outlet of the heat release side of the electric-driven heat pump 12 is connected to the heat network water inlet of the electric boiler 42. The heat network water outlet of the electric boiler 42 is connected to the water inlet of the water supply main pipe.

[0045] When operating in the heating season and with sufficient wind power, the electric-driven heat pump 12, the wind-heat unit, the seasonal heat storage unit with cross-seasonal buried pipes, the waste heat heating unit, and the electric boiler 42 heating unit are all in operation. Close Valve Four 14, Valve Six 19, Valve Eight 21, and Valve Nine 33, and open Valve Two 11, Valve Three 13, Valve Five 17, Valve Seven 20, Valve Ten 34, Valve Eleven 36, Valve Thirteen 38, Valve Fourteen 39, Valve Fifteen 40, Valve Sixteen 41, and Valve Seventeen 43.

[0046] The primary return water of the primary network at any temperature (e.g., 20 - 40 °C) enters the heat absorption side of the electrically driven heat pump 12 and the hot side of the evaporator 6 in sequence to release heat, reducing the temperature of the primary return water to below 25 °C. Then it enters the ground-source heat pump 15 for heat exchange with hot water, and the temperature rises to the temperature allowed at the inlet of the condenser 4. The heat source water of the buried pipe heat exchanger 18 enters the ground-source heat pump 15 for heat exchange and then the temperature drops. It is pumped to the buried pipe heat exchanger 18 by the buried pipe circulation pump 16 to re-absorb heat and form a cycle. This is the primary heating process of the primary return water of the primary network when the wind is sufficient.

[0047] After the primary heating is completed, the primary return water of the primary network can enter the condenser 4 through the valve fifteen 40. The refrigerant in the condenser 4 liquefies and releases heat to heat the primary return water of the primary network. At the same time, the primary return water of the primary network can enter the waste heat exchanger 35 through the valve thirteen 38 for heat exchange with hot water. The heat source water in the waste heat source 32 at 60 - 70 °C enters the waste heat exchanger 35 through the valve ten 34 for heat exchange. The heat source water of the waste heat source 32 further provides heat for the primary return water of the primary network. After the heat source water of the waste heat source 32 enters the waste heat exchanger 35 for heat exchange, the temperature drops, and it enters the waste heat source 32 again through the valve eleven 36 and the waste heat circulation pump 31 to form a cycle. This is the secondary heating of the primary return water of the primary network when the wind is sufficient. When the heat that the primary return water of the primary network can absorb is greater than the heating capacity of the waste heat source 32 and the wind-heat unit, the valve fourteen 39 is opened, and part of the primary return water of the primary network can be introduced into the hot network water bypass pipe. This is the secondary heating process of the primary return water of the primary network when the wind is sufficient.

[0048] Preferably, part of the working medium can be introduced into the heat release side of the electrically driven heat pump 12 to absorb the heat in the electrically driven heat pump 12. After this part of the working medium absorbs heat, it is introduced into the electric boiler 42, which can provide heat for the electric boiler 42, increasing the temperature in the electric boiler 42 (e.g., it can be increased to 80 °C), improving the utilization rate of the heat of the primary network hot water at any temperature introduced into the system. It should be explained that since the primary return water of the primary network at any temperature introduced into the system releases heat in the electrically driven heat pump 12, the electrically driven heat pump 12 passes the obtained heat into the electric boiler 42 through part of the working medium, increasing the temperature in the electric boiler 42. The electric boiler 42 can use the additional heat to heat the primary return water flowing in from the condenser 4 and the waste heat exchanger 35 to a higher temperature. Therefore, the utilization rate of the heat of the primary return water of the primary network at any temperature entering the system is improved. At the same time, the primary return water also reaches the temperature that can be introduced into the ground-source heat pump 15, which has a good protective effect on the ground-source heat pump 15, reduces the total power consumption, and is beneficial to improving the total efficiency of the system.

[0049] After the secondary heating is completed, the hot network water bypass pipe, the wind-heat unit, and the waste heat heating unit can be connected to the electric boiler 42 through the valve twelve 37, the valve sixteen 41, and the valve fourteen 39 respectively. Then, after being heated to the required supply water temperature by the electric boiler 42, it is connected to the water supply main pipe through the valve seventeen 43. This is the tertiary heating process of the primary return water of the primary network when the wind is sufficient.

[0050] It is understandable that integrating multiple renewable energy heat supplies to form a multi-energy complementary clean heat supply system enables clean energy to be evenly distributed in time and space and can serve as the main heat source for central heating. Through a three-stage cascade heating system, the demand for central heating can be met. Multiple energy sources can complement each other in heat energy, avoiding problems such as uneven distribution in time and space, unstable input, and being affected by objective factors, improving the stability of renewable energy heat supply, achieving full utilization of energy, and thus enhancing the energy utilization efficiency.

[0051] In Loop 2, when there is sufficient wind energy during the heating season, the fan impeller 1 is fixedly connected to the compressor 3 through the gearbox 2. The refrigeration working medium circulates between the compressor 3, the condenser 4, the evaporator 6, and the expansion valve 5. The cold medium outlet of the compressor 3 is connected to the cold medium inlet of the condenser 4, the cold medium outlet of the condenser 4 is connected to the inlet of the expansion valve 5, the outlet of the expansion valve 5 is connected to the cold medium inlet of the evaporator 6, and the cold medium outlet of the evaporator 6 is connected to the cold medium inlet of the compressor 3.

[0052] It is understandable that the fan impeller 1 is driven by wind energy. The fan impeller 1 converts wind energy into mechanical energy and drives the compressor 3 through the gearbox 2, enabling the condenser 4 in the wind-heat unit to perform secondary heating on the return water of the primary network. By the fan impeller 1, full utilization of wind energy can be achieved in combination with the actual situation, improving the cleanliness of heat supply. In addition, when Loop 2 is operating, wind energy acts on the fan impeller 1. The fan impeller 1 in the wind-heat unit serves as a driving part, and the low-grade heat of the return water of the primary network on the heat source side is deeply utilized, absorbing the heat of the return water of the primary network. On the user side, the heat absorbed by the heat source side is used to perform secondary heating on the return water of the primary network entering the condenser 4. This part of the system realizes the deep utilization of the low-grade heat of the return water of the primary network. Specifically, the evaporator 6 deeply utilizes the low-grade heat of the return water of the primary network, absorbing the heat of the return water of the primary network, and the condenser 4 uses the heat absorbed by the evaporator 6 to heat the return water of the primary network entering it.

[0053] Loop 3: Branch 1, the water inlet of the heat absorption side of the electric-driven heat pump 12 is connected to the return water of the primary network. The heat network water inlet of the ground-source heat pump 15 is connected to the water outlet of the heat absorption side of the electric-driven heat pump 12. The heat network water outlet of the ground-source heat pump 15 is connected to the heat network water inlet of the waste heat exchanger 35. The heat network water outlet of the waste heat exchanger 35 is connected to the heat network water inlet of the electric boiler 42. The heat network water outlet of the electric boiler 42 is connected to the water inlet of the water supply main pipe.

[0054] Branch two, the water inlet on the heat absorption side of the electric-driven heat pump 12 is connected to the return water of the primary network, the water outlet on the heat absorption side of the electric-driven heat pump 12 is connected to the heat network water inlet of the ground-source heat pump 15, the heat network water outlet of the ground-source heat pump 15 is connected to the water inlet on the heat release side of the electric-driven heat pump 12, the water outlet on the heat release side of the electric-driven heat pump 12 is connected to the heat network water inlet of the electric boiler 42, and the heat network water outlet of the electric boiler 42 is connected to the water inlet of the water supply main pipe.

[0055] When operating in the heating season and the wind power is insufficient, the electric-driven heat pump 12, the seasonal heat storage unit with buried pipes, the waste heat heating unit, and the electric boiler 42 heating unit are in operation, and the wind-heat unit exits operation. Close valve three 13, valve six 19, valve eight 21, valve nine 33, valve fifteen 40, and valve sixteen 41, and open valve two 11, valve four 14, valve five 17, valve seven 20, valve ten 34, valve eleven 36, valve thirteen 38, valve fourteen 39, valve seventeen 43.

[0056] Specifically, the return water of the primary network at any temperature (for example, 20 - 40 °C) first enters the electric-driven heat pump 12 to release heat, reducing the temperature of the return water of the primary network to below 25 °C, and then enters the ground-source heat pump 15 for hot water heat exchange. This is the primary heating process of the return water of the primary network when the wind power is insufficient.

[0057] After the primary heating is completed, the return water of the primary network can enter the waste heat exchanger 35 through valve thirteen 38 for hot water heat exchange. The heat source water in the waste heat source 32 at 60 - 70 °C enters the waste heat exchanger 35 through valve ten 34 for heat exchange. The heat source water in the waste heat source 32 further provides heat for the return water of the primary network. After the heat source water in the waste heat source 32 enters the waste heat exchanger 35 for heat exchange, its temperature decreases and then enters the waste heat source 32 again through valve eleven 36 and the waste heat circulation pump 31 to form a cycle. This is the secondary heating of the return water of the primary network when the wind power is sufficient. When the heat that the return water of the primary network can absorb is greater than the heating capacity of the waste heat source 32, open valve fourteen 39, and part of the return water of the primary network can be passed into the heat network water bypass pipe, and the wind-heat unit exits operation. This is the secondary heating process of the return water of the primary network when the wind power is sufficient.

[0058] In addition, part of the working medium can be introduced into the heat release side of the electric-driven heat pump 12 to absorb the heat in the electric-driven heat pump 12. After this part of the working medium absorbs heat, it is passed into the electric boiler 42, which can provide heat for the electric boiler 42, increasing the temperature in the electric boiler 42 (for example, it can be increased to 80 °C), and improving the utilization rate of the heat of the hot water of the primary network at any temperature passing through the system.

[0059] After the secondary heating is completed, the hot water network bypass pipe and the waste heat heating unit can be connected to the water inlet pipeline of the electric boiler 42 through valve twelve 37 and valve fourteen 39 respectively, and then heated to the required supply water temperature by the electric boiler 42 and connected to the primary network supply water main pipe by valve seventeen 43. This is the three-stage heating process of the primary network return water when the wind is sufficient.

[0060] In loop three and loop two, the primary network return water at any temperature enters the system. After releasing heat in the electric-driven heat pump 12, the primary network return water meets the temperature requirement for entering the ground-source heat pump 15, which not only has a good protective effect on the ground-source heat pump 15, reduces the total power consumption, and is beneficial to improving the total efficiency of the system; at the same time, since the electric-driven heat pump 12 can be used to release heat to the primary network return water, it also reduces the temperature requirement for the primary network return water entering the system, enabling the primary network return water in a wider temperature range to flow into the system, thereby expanding the application scope of the system.

[0061] Please continue to refer to Figure 1 , and in the embodiments of the present invention, a method for the heating system based on the complementary utilization of multiple clean energies is also provided, including the following steps:

[0062] Judge whether the system is operating in the heating season; if it is not operating in the heating season, the electric-driven heat pump 12, the wind-heat unit, and the electric boiler 42 heating unit are all in a shutdown state, and the waste heat heating unit flows the heat source water into the seasonal underground heat storage unit for heat storage.

[0063] Specifically, open valve six 19, valve eight 21, valve nine 33, and the waste heat circulation pump 31, and close other valves. The working medium flows through the waste heat heat source 32, and the hot water of the waste heat heat source 32 is at 60 - 70 °C. This hot water flows into the ground heat exchanger 18 through valve nine 33 and valve eight 21, heats and stores heat in the soil and then the temperature decreases, and then flows back to the waste heat heat source 32 through valve six 19 to form a cycle, realizing the storage of heat in the ground heat exchanger 18. During the heating season, the heat stored in the ground heat exchanger 18 is released through the ground-source heat pump 15, which can perform primary heating on the primary network return water, realizing the full-time scale and full utilization of waste heat resources, improving the energy utilization efficiency, and thus reducing the heating cost.

[0064] If it is operating in the heating season, then judge whether the wind is sufficient.

[0065] If there is sufficient wind power during the heating season, the return water of the primary network enters the heat absorption side water inlet of the electric-driven heat pump 12 and releases heat in the air-heat unit in sequence. After the temperature of the return water of the primary network decreases, it enters the seasonal underground heat storage unit. The seasonal underground heat storage unit conducts primary heating on the return water of the primary network. Then, the return water of the primary network is passed into the air-heat unit and the waste heat heating unit for secondary heating. The return water of the primary network after secondary heating is passed into the electric boiler 42 heating unit. The electric boiler 42 heating unit conducts tertiary heating on the return water of the primary network. Finally, the return water of the primary network after tertiary heating is transmitted to the water supply main pipe; or, a part of the return water of the primary network after primary heating is passed into the heat release side of the electric-driven heat pump 12 for heat absorption. Then, the return water of the primary network heated by the electric-driven heat pump 12 is passed into the electric boiler 42 heating unit. Finally, the return water of the primary network is transmitted to the water supply main pipe after being heated by the electric boiler 42 heating unit.

[0066] Specifically, close valve four 14, valve six 19, valve eight 21, and valve nine 33, and open valve two 11, valve three 13, valve five 17, valve seven 20, valve ten 34, valve eleven 36, valve thirteen 38, valve fourteen 39, valve fifteen 40, valve sixteen 41, and valve seventeen 43.

[0067] The return water of the primary network at any temperature (such as 20 - 40 °C) enters the heat absorption side of the electric-driven heat pump 12 and the hot side of the evaporator 6 in sequence to release heat, reducing the temperature of the return water of the primary network to below 25 °C. Then, it enters the ground-source heat pump 15 for hot water heat exchange, and the temperature rises to the temperature allowed at the inlet of the condenser 4. The heat source water of the ground heat exchanger 18 enters the ground-source heat pump 15 for heat exchange and then the temperature decreases. It is pumped to the ground heat exchanger 18 by the ground heat circulation pump 16 to re-absorb heat and form a cycle. This is the primary heating process of the return water of the primary network when there is sufficient wind power.

[0068] After primary heating is completed, the return water of the primary network can enter the condenser 4 through valve fifteen 40. The refrigerant in the condenser 4 liquefies and releases heat to heat the return water of the primary network; at the same time, the return water of the primary network can enter the waste heat exchanger 35 through valve thirteen 38 for hot water heat exchange. The heat source water in the waste heat source 32 at 60 - 70 °C enters the waste heat exchanger 35 through valve ten 34 for heat exchange. The heat source water of the waste heat source 32 further provides heat for the return water of the primary network. The heat source water of the waste heat source 32 enters the waste heat exchanger 35 for heat exchange and then the temperature decreases. It enters the waste heat source 32 again through valve eleven 36 and the waste heat circulation pump 31 to form a cycle. This is the secondary heating of the return water of the primary network when there is sufficient wind power. When the heat that can be absorbed by the return water of the primary network is greater than the heating capacity of the waste heat source 32 and the air-heat unit, open valve fourteen 39, and part of the return water of the primary network can be passed into the hot water bypass pipe. This is the secondary heating process of the return water of the primary network when there is sufficient wind power.

[0069] Part of the working medium can be introduced into the heat release side of the electric-driven heat pump 12 to absorb the heat in the electric-driven heat pump 12. After absorbing the heat, this part of the working medium is introduced into the electric boiler 42, which can provide heat for the electric boiler 42, increasing the temperature in the electric boiler 42 (for example, it can be increased to 80 °C), improving the utilization rate of the heat of the primary network hot water at any temperature entering the system. At this time, the heat release side of the electric-driven heat pump 12 is used for the secondary heating of the primary network return water; it should be explained that since the primary network return water at any temperature entering the system releases heat in the electric-driven heat pump 12, the electric-driven heat pump 12 passes the obtained heat into the electric boiler 42 through part of the working medium, increasing the temperature in the electric boiler 42. The electric boiler 42 can use the additional heat to heat the primary network return water flowing in from the condenser 4 and the waste heat heat exchanger 35 to a higher temperature. Therefore, the utilization rate of the heat of the primary network return water at any temperature entering the system is improved. At the same time, the primary network return water also reaches the temperature that can be introduced into the ground-source heat pump 15, which has a good protective effect on the ground-source heat pump 15, reduces the total power consumption, and is beneficial to improving the total efficiency of the system.

[0070] After the secondary heating is completed, the heat network water bypass pipe, the air-heat unit, and the waste heat heating unit can be connected to the electric boiler 42 through the valve twelve 37, the valve sixteen 41, and the valve fourteen 39 respectively, and then heated to the required supply water temperature by the electric boiler 42 and then connected to the supply main pipe by the valve seventeen 43. This is the tertiary heating process of the primary network return water when the wind is sufficient.

[0071] If the wind is insufficient during the heating season, the primary network return water enters the heat absorption side of the electric-driven heat pump 12 to release heat. The primary network return water with reduced temperature enters the seasonal buried pipe heat storage unit, and the seasonal buried pipe heat storage unit conducts primary heating on the primary network return water. Then the primary network return water is introduced into the waste heat heating unit for secondary heating. The primary network return water after secondary heating is introduced into the electric boiler 42 heating unit, and the electric boiler 42 heating unit conducts tertiary heating on the primary network return water. Finally, the primary network return water after tertiary heating is transmitted to the supply main pipe; or, part of the primary network return water after primary heating is introduced into the heat release side of the electric-driven heat pump 12 to absorb heat, and then the primary network return water heated by the electric-driven heat pump 12 is introduced into the electric boiler 42 heating unit. Finally, the primary network return water is heated by the electric boiler 42 heating unit and then transmitted to the supply main pipe.

[0072] Specifically, close the valve three 13, the valve six 19, the valve eight 21, the valve nine 33, the valve fifteen 40, and the valve sixteen 41, and open the valve two 11, the valve four 14, the valve five 17, the valve seven 20, the valve ten 34, the valve eleven 36, the valve thirteen 38, the valve fourteen 39, and the valve seventeen 43.

[0073] The primary return water of the primary network at any temperature (e.g., 20 - 40 °C) first enters the electrically driven heat pump 12 to release heat, reducing the temperature of the primary return water of the primary network to below 25 °C, and then enters the ground-source heat pump 15 for hot water heat exchange. This is the primary heating process of the primary return water of the primary network when the wind power is insufficient.

[0074] After the primary heating is completed, the primary return water of the primary network can enter the waste heat exchanger 35 through the valve thirteen 38 for hot water heat exchange. The heat source water in the waste heat source 32 at 60 - 70 °C enters the waste heat exchanger 35 through the valve ten 34 for heat exchange. The heat source water of the waste heat source 32 further provides heat for the primary return water of the primary network. After the heat source water of the waste heat source 32 enters the waste heat exchanger 35 for heat exchange, its temperature decreases, and then it enters the waste heat source 32 again through the valve eleven 36 and the waste heat circulation pump 31 to form a cycle. This is the secondary heating of the primary return water of the primary network when the wind power is sufficient. When the heat that the primary return water of the primary network can absorb is greater than the heating capacity of the waste heat source 32, the valve fourteen 39 is opened, and part of the primary return water of the primary network can be introduced into the hot water network bypass pipe, and the wind-heat unit exits the operation. This is the secondary heating process of the primary return water of the primary network when the wind power is sufficient.

[0075] In addition, part of the working medium can be introduced into the heat release side of the electrically driven heat pump 12 to absorb the heat in the electrically driven heat pump 12. After this part of the working medium absorbs heat, it is introduced into the electric boiler 42, which can provide heat for the electric boiler 42, increasing the temperature inside the electric boiler 42 (e.g., it can be increased to 80 °C), and improving the utilization rate of the heat of the primary network hot water at any temperature entering the system.

[0076] After the secondary heating is completed, the hot water network bypass pipe and the waste heat heating unit can be respectively connected to the water inlet pipe of the electric boiler 42 through the valve twelve 37 and the valve fourteen 39, and then heated to the required supply water temperature by the electric boiler 42 and connected to the primary network supply main pipe through the valve seventeen 43. This is the tertiary heating process of the primary return water of the primary network when the wind power is sufficient.

[0077] It can be understood that the above method performs tertiary heating on the primary return water of the primary network. Through the tertiary cascade heating system, the stability of renewable energy heating is improved, and the full utilization of energy is realized, thereby improving the energy utilization efficiency. Secondly, after the primary return water of the primary network is cooled by the electrically driven heat pump 12, it is introduced into the seasonal heat storage unit with buried pipes, which has a good protective effect on the seasonal heat storage unit with buried pipes, reduces the total power consumption, is beneficial to improving the total efficiency of the system, and also reduces the temperature requirement for the primary return water of the primary network entering the system, enabling the primary return water of the primary network in a wider temperature range to enter the system, improving the application range.

[0078] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantive changes and substitutions made by those skilled in the art based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A heating system based on the complementary utilization of multiple clean energies, characterized in that Including: An electric-driven heat pump, a wind-heat unit, a seasonal heat storage unit with buried pipes, a waste heat heating unit, an electric boiler heating unit, and a water supply main pipe The heat source water outlet of the waste heat heating unit is connected to the water inlet of the seasonal heat storage unit with buried pipes, and the water outlet of the seasonal heat storage unit with buried pipes is connected to the heat source water inlet of the waste heat heating unit; The water inlet of the heat absorption side of the electric-driven heat pump is connected to the return water of the primary network. The water outlet of the heat absorption side of the electric-driven heat pump is connected to the heat network water inlet of the wind-heat unit. The heat network water inlet of the seasonal heat storage unit with buried pipes is connected to the heat network water outlet of the wind-heat unit, or the heat network water inlet of the seasonal heat storage unit with buried pipes is connected to the water outlet of the heat absorption side of the electric-driven heat pump; The heat network water outlet of the seasonal heat storage unit with buried pipes is connected to the heat network water inlet of the waste heat heating unit. The heat network water outlet of the waste heat heating unit is connected to the heat network water inlet of the electric boiler heating unit. The heat network water outlet of the seasonal heat storage unit with buried pipes is connected to the heat network water inlet of the wind-heat unit. The heat network water outlet of the wind-heat unit is connected to the heat network water inlet of the electric boiler heating unit. The heat network water outlet of the seasonal heat storage unit with buried pipes is connected to the water inlet of the heat release side of the electric-driven heat pump. The water outlet of the heat release side of the electric-driven heat pump is connected to the heat network water inlet of the electric boiler heating unit. The heat network water outlet of the electric boiler heating unit is connected to the water inlet of the water supply main pipe; The wind-heat unit includes a fan impeller, a gearbox, a compressor, a condenser, an expansion valve, and an evaporator; The water outlet of the heat absorption side of the electric-driven heat pump is connected to the heat network water inlet of the evaporator. The heat network water outlet of the evaporator is connected to the heat network water inlet of the seasonal heat storage unit with buried pipes. The heat network water outlet of the seasonal heat storage unit with buried pipes is connected to the heat network water inlet of the condenser. The heat network water outlet of the condenser is connected to the heat network water inlet of the electric boiler heating unit.

2. The heating system based on the complementary utilization of multiple clean energies as claimed in claim 1, wherein The fan impeller is fixedly connected to the compressor through the gearbox. The cold medium outlet of the compressor is connected to the cold medium inlet of the condenser. The cold medium outlet of the condenser is connected to the expansion valve inlet. The expansion valve outlet is connected to the cold medium inlet of the evaporator. The cold medium outlet of the evaporator is connected to the cold medium inlet of the compressor.

3. The heating system based on the complementary utilization of multiple clean energy sources according to claim 1, characterized in that, The seasonal heat storage unit with buried pipes includes a ground-source heat pump, a ground buried pipe circulation pump, and a ground buried pipe heat exchanger; The water outlet of the heat absorption side of the electric-driven heat pump is connected to the heat network water inlet of the ground-source heat pump, or the heat network water outlet of the wind-heat unit is connected to the heat network water inlet of the ground-source heat pump. The heat network water outlet of the ground-source heat pump is respectively connected to the heat network water inlet of the waste heat heating unit, the heat network water inlet of the wind-heat unit, and the water inlet of the heat release side of the electric-driven heat pump; The heat source water outlet of the buried pipe circulation pump is connected to the heat source water inlet of the ground source heat pump, the heat source water outlet of the ground source heat pump is connected to the heat source water inlet of the buried pipe circulation pump, and the heat source water inlet of the buried pipe circulation pump is equipped with the buried pipe circulation pump; The heat source water outlet of the waste heat heating unit is connected to the heat source water inlet of the buried pipe heat exchanger, and the heat source water outlet of the buried pipe heat exchanger is connected to the heat source water inlet of the waste heat heating unit.

4. The heating system based on the complementary utilization of multiple clean energies as claimed in claim 1, wherein The waste heat heating unit includes a waste heat circulation pump, a waste heat heat source, and a waste heat heat exchanger; The heat network water outlet of the seasonal heat storage buried pipe unit is connected to the heat network water inlet of the waste heat heat exchanger, and the heat network water outlet of the waste heat heat exchanger is connected to the heat network water inlet of the electric boiler heating unit; The heat source water outlet of the waste heat heat source is connected to the heat source water inlet of the waste heat heat exchanger, the heat source water outlet of the waste heat heat exchanger is connected to the heat source water inlet of the waste heat heat source, and the heat source water inlet of the waste heat heat source is equipped with the waste heat circulation pump; The heat source water outlet of the waste heat heat source is connected to the inlet of the seasonal heat storage buried pipe unit, and the outlet of the seasonal heat storage buried pipe unit is connected to the heat source water inlet of the waste heat heat source.

5. The heating system based on the complementary utilization of multiple clean energies as claimed in claim 1, characterized in that The electric boiler heating unit includes an electric boiler. The heat release side outlet of the electric drive heat pump, the heat network water outlet of the waste heat heating unit, and the heat network water outlet of the air heating unit are all connected to the heat network water inlet of the electric boiler, and the heat network water outlet of the electric boiler is connected to the inlet of the water supply main pipe.

6. The heating system based on the complementary utilization of multiple clean energies according to any one of claims 1-5, characterized in that, The heating system based on the complementary utilization of multiple clean energies further includes a heat network water bypass pipe. The heat network water outlet of the seasonal heat storage buried pipe unit is connected to the inlet of the heat network water bypass pipe, and the outlet of the heat network water bypass pipe is connected to the heat network water inlet of the electric boiler heating unit.

7. A method for a heating system based on the complementary utilization of multiple clean energies as described in claim 1, characterized in that, It includes the following steps: Judge whether the system is operating in the heating season; If it is not operating in the heating season, the electric drive heat pump, the air heating unit, and the electric boiler heating unit are all in a shutdown state, and the waste heat heating unit flows the heat source water into the seasonal heat storage buried pipe unit for heat storage; If it is operating in the heating season, judge whether the wind force is sufficient; If there is sufficient wind power during the heating season, the return water of the primary network sequentially enters the heat absorption side water inlet of the electric-driven heat pump and releases heat in the air-heat unit. The return water of the primary network with reduced temperature enters the seasonal heat storage unit with buried pipes, and the seasonal heat storage unit with buried pipes conducts primary heating on the return water of the primary network. Then, the return water of the primary network is passed into the air-heat unit and the waste heat heating unit for secondary heating. The return water of the primary network after secondary heating is passed into the electric boiler heating unit, and the electric boiler heating unit conducts tertiary heating on the return water of the primary network. Finally, the return water of the primary network after tertiary heating is transmitted to the water supply main pipe; or, a part of the return water of the primary network after primary heating is passed into the heat release side of the electric-driven heat pump for heat absorption, and then the return water of the primary network heated by the electric-driven heat pump is passed into the electric boiler heating unit. Finally, the return water of the primary network is heated by the electric boiler heating unit and then transmitted to the water supply main pipe. If there is insufficient wind power during the heating season, the return water of the primary network enters the heat absorption side of the electric-driven heat pump for heat release. The return water of the primary network with reduced temperature enters the seasonal heat storage unit with buried pipes, and the seasonal heat storage unit with buried pipes conducts primary heating on the return water of the primary network. Then, the return water of the primary network is passed into the waste heat heating unit for secondary heating. The return water of the primary network after secondary heating is passed into the electric boiler heating unit, and the electric boiler heating unit conducts tertiary heating on the return water of the primary network. Finally, the return water of the primary network after tertiary heating is transmitted to the water supply main pipe; or, a part of the return water of the primary network after primary heating is passed into the heat release side of the electric-driven heat pump for heat absorption, and then the return water of the primary network heated by the electric-driven heat pump is passed into the electric boiler heating unit. Finally, the return water of the primary network is heated by the electric boiler heating unit and then transmitted to the water supply main pipe.

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