A complementary clean heating system and method for large temperature difference heating

Abstract

The present invention relates to a complementary clean heating system and method for large temperature difference heating, wherein the system comprises: a wind-heating unit, a cross-season buried pipe heat storage unit, a waste heat heating unit, an electric boiler heating unit and a water supply main pipe, wherein the hot network water inlet of the wind-heating unit evaporator is connected to the primary network return water, the hot network water inlet of the cross-season buried pipe heat storage unit is connected to the hot network water outlet of the wind-heating unit evaporator, the hot network water outlet of the cross-season buried pipe heat storage unit is connected to the hot network water inlet of the waste heat heating unit, the hot network water outlet of the waste heat heating unit is connected to the hot network water inlet of the electric boiler heating unit, the hot network water outlet of the cross-season buried pipe heat storage unit is connected to the hot network water inlet of the wind-heating unit condenser, and the hot network water outlet of the wind-heating unit condenser is connected to the hot network water inlet of the electric boiler heating unit. The technical scheme of the present invention can improve the stability of renewable energy heating and reduce heating costs.

Description

Technical Field

[0001] The present invention relates to the technical field of complementary clean heating, and in particular to a complementary clean heating system for large temperature difference heating and a method thereof. Background Art

[0002] Actively developing a clean heating system coupled with renewable energy can not only achieve low-carbon clean heating, but also promote the consumption of new energy such as wind and light. It is a new research direction in the field of centralized heating.

[0003] At present, there are two main problems in clean heating coupled with renewable energy that need to be solved urgently. First, renewable energy heating has the problem of insufficient heating stability. Heating from renewable energy sources such as wind and light is restricted by weather, region, season and other factors, and has the characteristics of intermittent, unstable and seasonal. When using only one clean energy for heating, there will be problems such as uneven distribution of clean energy in time and space, unstable input, and the system is easily affected by objective factors, making it difficult to serve as the main heat source for centralized heating. Secondly, clean heating has the problem of excessively high heating costs. The main technical routes for clean energy heating include gas boiler heating, electric boiler heating, biomass heating, air source heat pump heating, geothermal energy heating, wind power heating, solar energy heating and other technologies, but the heating cost is significantly higher than coal-fired cogeneration. Calculated at a standard coal price of 1,000 yuan / t, the heating cost of coal-fired cogeneration is about 40 yuan / GJ, while the heating cost of biomass cogeneration is about 50-60 yuan / GJ, solar heating is about 100-200 yuan / GJ, and medium-deep geothermal heating is 50-70 yuan / GJ. Therefore, how to use various clean heating technologies for system integration, achieve full energy utilization, and reduce clean heating costs is another key issue that technicians in the field of centralized heating need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a complementary clean heating system for large temperature difference heating, which can improve the stability of renewable energy heating and reduce heating costs and has good applicability.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A complementary clean heating system with large temperature difference heating, including: wind heating unit, inter-seasonal buried pipe heat storage unit, waste heat heating unit, electric boiler heating unit and water supply main pipe,

[0007] The heat source water outlet of the waste heat heating unit is connected to the water inlet of the inter-seasonal buried pipe thermal storage unit, and the water outlet of the inter-seasonal buried pipe thermal storage unit is connected to the heat source water inlet of the waste heat heating unit;

[0008] The hot network water inlet of the wind thermal unit is connected to the primary network return water, the hot network water inlet of the cross-seasonal buried pipe heat storage unit is connected to the hot network water outlet of the wind thermal unit, the hot network water outlet of the cross-seasonal buried pipe heat storage unit is connected to the hot network water inlet of the waste heat heating unit, the hot network water outlet of the waste heat heating unit is connected to the hot network water inlet of the electric boiler heating unit, the hot network water outlet of the cross-seasonal buried pipe heat storage unit is connected to the hot network water inlet of the wind thermal unit, the hot network water outlet of the wind thermal unit is connected to the hot network water inlet of the electric boiler heating unit, and the hot network water outlet of the electric boiler heating unit is connected to the inlet of the water supply mother pipe.

[0009] Preferably, the wind-heat unit comprises a fan impeller, a gear box, a compressor, a condenser, an expansion valve and an evaporator;

[0010] The primary network return water is connected to the hot network water inlet of the evaporator, the hot network water outlet of the evaporator is connected to the hot network water inlet of the inter-seasonal buried pipe thermal storage unit, the hot network water outlet of the inter-seasonal buried pipe thermal storage unit is connected to the hot network water inlet of the condenser, and the hot network water outlet of the condenser is connected to the hot network water inlet of the electric boiler heating unit;

[0011] The fan impeller is fixedly connected to the compressor through the gear box, the cold mass outlet of the compressor is connected to the cold mass inlet of the condenser, the cold mass outlet of the condenser is connected to the expansion valve inlet, the expansion valve outlet is connected to the cold mass inlet of the evaporator, and the cold mass outlet of the evaporator is connected to the cold mass inlet of the compressor.

[0012] Preferably, the inter-seasonal buried pipe heat storage unit comprises an inter-seasonal buried pipe heat storage heat exchanger, an inter-seasonal buried pipe heat storage circulation pump and a buried pipe;

[0013] The primary network return water is connected to the hot network water inlet of the inter-seasonal buried pipe heat storage heat exchanger, and the hot network water outlet of the inter-seasonal buried pipe heat storage heat exchanger is respectively connected to the hot network water inlet of the waste heat heating unit and the hot network water inlet of the wind heat unit;

[0014] The heat source water outlet of the underground pipe is connected to the heat source water inlet of the inter-seasonal buried pipe heat storage heat exchanger, the heat source water outlet of the inter-seasonal buried pipe heat storage heat exchanger is connected to the heat source water inlet of the underground pipe, and the heat source water inlet of the underground pipe is installed with the inter-seasonal buried pipe heat storage 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, and the heat source water outlet of the buried pipe is connected to the heat source water inlet of the waste heat heating unit.

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

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

[0018] The heat source water outlet of the waste 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 source, and the heat source water inlet of the waste heat source is installed with the waste heat circulation pump;

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

[0020] Preferably, the electric boiler heating unit includes an electric boiler, the hot network water outlet of the waste heat heating unit and the hot network water outlet of the wind heat unit are both connected to the hot network water inlet of the electric boiler, and the hot network water outlet of the electric boiler is connected to the water inlet of the water supply mother pipe.

[0021] Preferably, the complementary clean heating system for large temperature difference heating also includes a heating network water bypass pipe, the heating network water outlet of the inter-seasonal buried pipe heat storage unit is connected to the water inlet of the heating network water bypass pipe, and the water outlet of the heating network water bypass pipe is connected to the heating network water inlet of the electric boiler heating unit.

[0022] The technical solution of the present invention also provides a method for the complementary clean heating system for large temperature difference heating, comprising the following steps:

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

[0024] If it is not operated in the heating season, the wind-heating unit and the electric boiler heating unit are both in a shutdown state, and the waste heat heating unit flows the heat source water into the inter-seasonal buried pipe heat storage unit for heat storage;

[0025] If it is operated during the heating season, determine whether the wind is sufficient;

[0026] If the wind is sufficient in the heating season, the primary network return water enters the wind-heating unit as a low-temperature heat source, and the primary network return water after the temperature is reduced enters the inter-seasonal buried pipe heat storage unit, and the inter-seasonal buried pipe heat storage unit performs primary heating on the primary network return water, and then the primary network return water is passed into the wind-heating unit and the waste heat heating unit for secondary heating, and the primary network return water after the secondary heating is passed into the electric boiler heating unit, and the electric boiler heating unit performs tertiary heating on the primary network return water, and finally transmits the primary network return water after the tertiary heating to the water supply mother pipe;

[0027] If the wind is insufficient during the heating season, the return water from the primary network will enter the inter-seasonal buried pipe heat storage unit, which will perform primary heating on the return water from the primary network. The return water from the primary network will then be introduced into the waste heat heating unit for secondary heating. The return water from the primary network after the secondary heating will be introduced into the electric boiler heating unit, which will perform tertiary heating on the return water from the primary network. Finally, the return water from the primary network after the tertiary heating will be transmitted to the main water supply pipe.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The above technical solution provides a complementary clean heating system with large temperature difference heating. It integrates four renewable energy sources to form a multi-energy complementary clean heating system through wind-heating units, inter-seasonal buried pipe heat storage units, waste heat heating units, electric boiler heating units and water supply main pipes. It can replace coal-fired cogeneration and regional coal-fired boiler rooms as heating sources, achieve good carbon reduction benefits, and promote the consumption of new energy. Secondly, the inter-seasonal buried pipe heat storage unit receives the waste heat from the waste heat heating unit in the non-heating season and stores heat. In the heating season, the inter-seasonal buried pipe heat storage unit can The network return water is primarily heated, and the waste heat heating unit in the heating season performs secondary heating on the primary network return water, which realizes the full utilization of waste heat resources over the entire time scale, improves the energy utilization efficiency, and thus reduces the heating cost; in addition, in the heating season, the cross-season buried pipe heat storage unit performs primary heating on the primary network return water, the waste heat heating unit and the wind heat unit perform secondary heating on the primary network return water, and the electric boiler heating unit performs tertiary heating on the primary network return water. Through the three-stage cascade heating system, the stability of renewable energy heating is improved, and full utilization of energy is achieved, thereby improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of a complementary clean heating system for large temperature difference heating in an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Fan impeller; 2. Gearbox; 3. Compressor; 4. Condenser; 5. Evaporator; 6. Valve 1; 7. Valve 2; 8. Expansion valve; 9. Valve 3; 10. Inter-seasonal buried pipe heat storage heat exchanger; 11. Inter-seasonal buried pipe heat storage circulation pump; 12. Buried pipe; 13. Valve 4; 14. Valve 5; 15. Valve 6; 16. Valve 7; 17. Valve 8; 18. Valve 9; 19. Waste heat circulation pump; 20. Valve 10; 21. Waste heat source; 22. Valve 11; 23. Waste heat exchanger; 24. Valve 12; 25. Valve 13; 26. Valve 14; 27. Valve 15; 28. Valve 16; 29. ​​Valve 17; 30. Electric boiler; 31. Valve 18. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood 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", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The embodiment of the present invention provides a complementary clean heating system for large temperature difference heating, which integrates four types of renewable energy heating to form a multi-energy complementary clean heating system, which can replace coal-fired cogeneration and regional coal-fired boiler rooms as heating sources, achieve good carbon reduction benefits, and promote the consumption of new energy; secondly, the inter-seasonal buried pipe heat storage unit receives the waste heat in the waste heat heating unit in the non-heating season and stores heat, the inter-seasonal buried pipe heat storage unit in the heating season can perform primary heating of the primary network return water, and the waste heat heating unit in the heating season performs secondary heating of the primary network return water, which realizes the full utilization of waste heat resources over the entire time scale, improves the energy utilization efficiency, and thus reduces the heating cost; in addition, the inter-seasonal buried pipe heat storage unit in the heating season performs primary heating of the primary network return water, the waste heat heating unit and the wind heat unit perform secondary heating of the primary network return water, and the electric boiler heating unit performs tertiary heating of the primary network return water. Through the three-stage cascade heating system, the stability of renewable energy heating is improved, and the full utilization of energy is achieved, thereby improving the energy utilization efficiency.

[0037] See also Figure 1 In one embodiment, a complementary clean heating system for large temperature difference heating includes: a wind-heating unit, a cross-seasonal buried pipe heat storage unit, a waste heat heating unit, an electric boiler heating unit, a water supply main pipe and a heat network water bypass pipe. Among them, the electric boiler heating unit includes an electric boiler 30. The cross-seasonal buried pipe heat storage unit includes a cross-seasonal buried pipe heat storage heat exchanger 10, a cross-seasonal buried pipe heat storage circulation pump 11 and a buried pipe 12. The wind-heating unit includes a fan impeller 1, a gear box 2, a compressor 3, a condenser 4, an evaporator 5 and an expansion valve 8. The waste heat heating unit includes a waste heat circulation pump 19, a waste heat source 21 and a waste heat exchanger 23.

[0038] It should be noted that the cross-season buried pipe heat storage unit is primary heating, the wind heat unit and the waste heat heating unit can be connected in parallel for secondary heating, and the electric boiler heating unit is tertiary heating; the system operation is divided into two operating modes: waste heat storage in the non-heating season and step heating in the heating season.

[0039] Furthermore, in the embodiment of the present invention, in addition to using the fan impeller 1 as a driving part, the wind-heating unit can also adopt an electric drive form, that is, the fan impeller 1 and the gear box 2 are replaced with electric motor equipment. The electric boiler 30 can also be replaced by a gas-fired high-temperature hot water boiler.

[0040] Circuit 1: The heat source water outlet of the waste heat heating unit is connected to the heat source water inlet of the buried pipe of the inter-seasonal buried pipe heat storage unit, wherein the heat source water outlet of the waste heat source 21 is connected to the inlet of the buried pipe 12, and the outlet of the buried pipe 12 is connected to the heat source water inlet of the waste heat source 21.

[0041] When operating in the non-heating season, the waste heat source 21 and the buried pipe 12 form a heat storage circulation loop, and the wind-heating unit and the electric boiler heating unit are both in a shutdown state.

[0042] Specifically, valve five 14, valve seven 16, valve eight 17, valve ten 20 are opened, and valve one 6, valve two 7, valve three 9, valve four 13, valve six 15, valve nine 18, valve eleven 22, valve twelve 24, valve thirteen 25, valve fourteen 26, valve fifteen 27, valve sixteen 28, valve seventeen 29, and valve eighteen 31 are closed. The hot water in the waste heat source 21 is at 60-70°C, and the hot water flows into the buried pipe 12 through valve ten 20 and valve seven 16, and the temperature decreases after heating the soil and accumulating heat, and then flows back to the waste heat source 21 through valve five 14 and valve eight 17, forming a heat storage circulation loop, and realizing heat storage in the buried pipe 12. In the heating season, the heat stored in the buried pipe 12 is released through the inter-seasonal buried pipe heat storage heat exchanger 10, which can perform primary heating on the return water of the primary network, realize the full utilization of waste heat resources in the whole time scale, improve the utilization efficiency of energy, and thus reduce the heating cost.

[0043] Loop 2: Branch 1, the primary network return water is connected to the hot network water inlet of the evaporator 5, the hot network water outlet of the evaporator 5 is connected to the hot network water inlet of the inter-seasonal buried pipe heat storage heat exchanger 10, the hot network water outlet of the inter-seasonal buried pipe heat storage heat exchanger 10 is connected to the hot network water inlet of the waste heat exchanger 23, the hot network water outlet of the waste heat exchanger 23 is connected to the hot network water inlet of the electric boiler 30, and the hot network water outlet of the electric boiler 30 is connected to the water inlet of the water supply mother pipe.

[0044] Branch two, the primary network return water is connected to the hot network water inlet of the evaporator 5, the hot network water outlet of the evaporator 5 is connected to the hot network water inlet of the inter-seasonal buried pipe heat storage heat exchanger 10, the hot network water outlet of the inter-seasonal buried pipe heat storage heat exchanger 10 is connected to the hot network water inlet of the condenser 4, the hot network water outlet of the condenser 4 is connected to the hot network water inlet of the electric boiler 30, and the hot network water outlet of the electric boiler 30 is connected to the water inlet of the water supply mother pipe.

[0045] Branch three, the primary network return water is connected to the hot network water inlet of the evaporator 5, the hot network water outlet of the evaporator 5 is connected to the hot network water inlet of the inter-seasonal buried pipe heat storage heat exchanger 10, the hot network water outlet of the inter-seasonal buried pipe heat storage heat exchanger 10 is connected to the inlet of the bypass pipe, the outlet of the bypass pipe is connected to the hot network water inlet of the electric boiler heating unit, and the hot network water outlet of the electric boiler 30 is connected to the inlet of the water supply mother pipe.

[0046] When it is in the heating season and the wind is sufficient, the wind-heating unit, the inter-seasonal buried pipe heat storage unit, the waste heat heating unit and the electric boiler heating unit are all in operation. Close valve three 9, valve five 14, valve seven 16, valve eight 17, valve ten 20, and open valve one 6, valve two 7, valve four 13, valve six 15, valve nine 18, valve eleven 22, valve twelve 24, valve thirteen 25, valve fourteen 26, valve fifteen 27, valve sixteen 28, valve seventeen 29, valve eighteen 31.

[0047] Specifically, the hot water in the primary network return water is not higher than 25°C, and first enters the evaporator 5 through valve one 6 and valve two 7 as a low-temperature heat source. The condensing agent in the evaporator 5 is vaporized and absorbs the heat in the primary network return water, so that the temperature of the primary network return water is reduced; then, it enters the inter-seasonal buried pipe heat storage heat exchanger 10 for hot water heat exchange, and at the same time, the heat source water in the buried pipe 12 enters the inter-seasonal buried pipe heat storage heat exchanger 10 through valve six 15. The heat source water in the buried pipe 12 further provides heat for the primary network return water, so that the temperature of the primary network return water rises to the temperature allowed by the condenser 4. The heat source water in the buried pipe 12 enters the inter-seasonal buried pipe heat storage heat exchanger 10 for heat exchange, and the temperature decreases. It is pumped to the buried pipe 12 through the inter-seasonal buried pipe heat storage circulation pump 11 to absorb heat again to form a circulation. This is the primary heating of the primary network return water when the wind is sufficient.

[0048] After the primary heating is completed, the primary network return water can enter the condenser 4 through the valve 16 28, and the condensing agent in the condenser 4 liquefies and releases heat to heat the primary network return water; at the same time, the primary network return water can enter the waste heat exchanger 23 through the valve 13 25 for hot water heat exchange, and the heat source water of the waste heat source 21 at 60-70°C enters the waste heat exchanger 23 through the valve 11 22 for heat exchange, and the heat source water of the waste heat source 21 further provides heat for the primary network return water. The heat source water of the waste heat source 21 enters the waste heat exchanger 23 for heat exchange, and the temperature decreases after the heat source water enters the waste heat exchanger 23 for heat exchange, and enters the waste heat source 21 again through the valve 9 18 and the waste heat circulation pump 19 to form a cycle. This is the secondary heating of the primary network return water when the wind is sufficient. Preferably, when the heat that can be absorbed by the primary network return water is greater than the heating capacity of the waste heat heating unit and the wind heat unit, open the valve 14 26 to pass part of the primary network return water into the bypass pipe.

[0049] After the secondary heating is completed, the hot network water in the waste heat heating unit, the wind heating unit and the bypass pipe can be connected to the electric boiler 30 through valve 15 27, valve 17 29 and valve 14 26 respectively, and then heated to the required water supply temperature by the electric boiler 30 and connected to the water supply main pipe through valve 18 31. This is the three-stage heating of the primary network return water when the wind power is sufficient.

[0050] It is understandable that integrating four types of renewable energy heating to form a multi-energy complementary clean heating system can replace coal-fired cogeneration and regional coal-fired boiler rooms as heating sources, achieving good carbon reduction benefits while promoting the consumption of new energy. Through the three-level cascade heating system, the needs of centralized heating are met, and multiple energy sources can complement each other's 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 heating, and achieving full utilization of energy, thereby improving energy utilization efficiency.

[0051] Loop three: Branch one, the primary network return water is connected to the hot network water inlet of the inter-seasonal buried pipe heat storage heat exchanger 10, the hot network water outlet of the inter-seasonal buried pipe heat storage heat exchanger 10 is connected to the hot network water inlet of the waste heat exchanger 23, the hot network water outlet of the waste heat exchanger 23 is connected to the hot network water inlet of the electric boiler 30, and the hot network water outlet of the electric boiler 30 is connected to the water inlet of the water supply mother pipe.

[0052] Branch two, the primary network return water is connected to the hot network water inlet of the inter-seasonal buried pipe heat storage heat exchanger 10, the hot network water outlet of the inter-seasonal buried pipe heat storage heat exchanger 10 is connected to the inlet of the bypass pipe, the outlet of the bypass pipe is connected to the hot network water inlet of the electric boiler heating unit, and the hot network water outlet of the electric boiler 30 is connected to the inlet of the water supply mother pipe.

[0053] When it is in the heating season and the wind power is insufficient, the inter-seasonal buried pipe heat storage unit, the waste heat heating unit and the electric boiler heating unit are in operation, and the wind heat unit is out of operation. Close valve one 6, valve five 14, valve seven 16, valve eight 17, valve ten 20, valve sixteen 28, valve seventeen 29, and open valve two 7, valve three 9, valve four 13, valve six 15, valve nine 18, valve eleven 22, valve twelve 24, valve thirteen 25, valve fourteen 26, valve fifteen 27, valve eighteen 31.

[0054] Specifically, the hot water in the primary network return water is not higher than 25°C, and first enters the inter-seasonal buried pipe heat storage heat exchanger 10 through valve two 7 and valve three 9 for hot water heat exchange. At the same time, the heat source water in the buried pipe 12 enters the inter-seasonal buried pipe heat storage heat exchanger 10 through valve six 15. The heat source water in the buried pipe 12 further provides heat for the primary network return water, so that the primary network return water temperature rises to the temperature allowed by the inlet of the condenser 4. The heat source water in the buried pipe 12 enters the inter-seasonal buried pipe heat storage heat exchanger 10 for heat exchange, and the temperature decreases after the heat source water in the buried pipe 12 enters the inter-seasonal buried pipe heat storage heat exchanger 10 for heat exchange. It is pumped to the buried pipe 12 through the inter-seasonal buried pipe heat storage circulation pump 11 to absorb heat again to form a circulation. This is the primary heating of the primary network return water when the wind is sufficient.

[0055] After the primary heating is completed, the primary network return water can enter the waste heat exchanger 23 through the valve thirteen 25 for hot water heat exchange, and the heat source water in the waste heat source 21 at 60-70°C enters the waste heat exchanger 23 through the valve eleven 22 for heat exchange, and the heat source water of the waste heat source 21 further provides heat for the primary network return water. The heat source water of the waste heat source 21 enters the waste heat exchanger 23 and the temperature decreases after heat exchange, and enters the waste heat source 21 again through the valve nine 18 and the waste heat circulation pump 19 to form a cycle. This is the secondary heating of the primary network return water when the wind is sufficient. Preferably, when the heat that can be absorbed by the primary network return water is greater than the heating capacity of the waste heat heating unit, open the valve fourteen 26 to pass part of the primary network return water into the bypass pipe.

[0056] After the secondary heating is completed, the hot network water in the waste heat heating unit and the bypass pipe can be connected to the electric boiler 30 through valve 15 27 and valve 14 26 respectively, and then connected to the water supply main pipe through valve 18 31 after being heated to the required water supply temperature by the electric boiler 30. This is the three-stage heating of the primary network return water when the wind power is sufficient.

[0057] Both loop 2 and loop 3 are operated in the heating season, and the fan impeller 1 is fixedly connected to the compressor 3 through the gear box 2. The refrigerant circulates between the compressor 3, the condenser 4, the evaporator 5 and the expansion valve 8. The refrigerant outlet of the compressor 3 is connected to the refrigerant inlet of the condenser 4, the refrigerant outlet of the condenser 4 is connected to the inlet of the expansion valve 8, the outlet of the expansion valve 8 is connected to the refrigerant inlet of the evaporator 5, and the refrigerant outlet of the evaporator 5 is connected to the refrigerant inlet of the compressor 3.

[0058] It can be understood that the fan impeller 1 is driven by wind energy, and the fan impeller 1 converts wind energy into mechanical energy and drives the compressor 3 through the gear box 2, so that the condenser 4 in the wind-heating unit performs secondary heating on the primary network return water. In addition, when the second loop is running, the wind energy acts on the fan impeller, and the fan impeller in the wind-heating unit serves as a driving part. The heat source makes deep use of the low-grade heat of the primary network return water, absorbs the heat of the primary network return water, and the user side uses the heat absorbed by the heat source to perform secondary heating on the primary network return water entering the condenser. This part of the system realizes the deep utilization of the low-grade heat of the primary network return water; specifically, the evaporator 5 makes deep use of the low-grade heat of the primary network return water, absorbs the heat of the primary network return water, and the condenser 4 uses the heat absorbed by the evaporator 5 to heat the primary network return water entering it.

[0059] Please continue reading Figure 1 In an embodiment of the present invention, a method for a complementary clean heating system for large temperature difference heating is also provided, comprising the following steps:

[0060] It is determined whether the system is operating in the heating season.

[0061] If it is not operating during the heating season, the wind thermal unit and the electric boiler heating unit are both in a shutdown state, and the waste heat heating unit will flow the heat source water into the inter-seasonal buried pipe heat storage unit for heat storage.

[0062] Specifically, valve five 14, valve seven 16, valve eight 17, valve ten 20 are opened, and valve one 6, valve two 7, valve three 9, valve four 13, valve six 15, valve nine 18, valve eleven 22, valve twelve 24, valve thirteen 25, valve fourteen 26, valve fifteen 27, valve sixteen 28, valve seventeen 29, and valve eighteen 31 are closed. The hot water in the waste heat source 21 is at 60-70°C, and the hot water flows into the buried pipe 12 through valve ten 20 and valve seven 16, and the temperature decreases after heating the soil and accumulating heat, and then flows back to the waste heat source 21 through valve five 14 and valve eight 17, forming a heat storage circulation loop, and realizing heat storage in the buried pipe 12. In the heating season, the heat stored in the buried pipe 12 is released through the inter-seasonal buried pipe heat storage heat exchanger 10, which can perform primary heating on the return water of the primary network, realize the full utilization of waste heat resources in the whole time scale, improve the utilization efficiency of energy, and thus reduce the heating cost.

[0063] If it is operated during the heating season, determine whether the wind speed is sufficient.

[0064] If there is sufficient wind during the heating season, the return water from the primary network enters the wind-heating unit as a low-temperature heat source. The return water from the primary network after the temperature is reduced enters the inter-seasonal buried pipe heat storage unit. The inter-seasonal buried pipe heat storage unit performs primary heating on the return water from the primary network. Then the return water from the primary network is passed into the wind-heating unit and the waste heat heating unit for secondary heating. The return water from the primary network after the secondary heating is passed into the electric boiler heating unit. The electric boiler heating unit performs tertiary heating on the return water from the primary network. Finally, the return water from the primary network after the tertiary heating is transmitted to the water supply mother pipe.

[0065] Specifically, valve three 9, valve five 14, valve seven 16, valve eight 17, and valve ten 20 are closed, and valve one 6, valve two 7, valve four 13, valve six 15, valve nine 18, valve eleven 22, valve twelve 24, valve thirteen 25, valve fourteen 26, valve fifteen 27, valve sixteen 28, valve seventeen 29, and valve eighteen 31 are opened.

[0066] The hot water in the primary network return water is not higher than 25°C. It first enters the evaporator 5 as a low-temperature heat source through valve one 6 and valve two 7. The condensing agent in the evaporator 5 is vaporized and absorbs the heat in the primary network return water, so that the temperature of the primary network return water is reduced; then, it enters the inter-seasonal buried pipe heat storage heat exchanger 10 for hot water heat exchange. At the same time, the heat source water in the buried pipe 12 enters the inter-seasonal buried pipe heat storage heat exchanger 10 through valve six 15. The heat source water in the buried pipe 12 further provides heat for the primary network return water, so that the temperature of the primary network return water rises to the temperature allowed by the condenser 4. The heat source water in the buried pipe 12 enters the inter-seasonal buried pipe heat storage heat exchanger 10 for heat exchange, and the temperature decreases. It is pumped to the buried pipe 12 through the inter-seasonal buried pipe heat storage circulation pump 11 to absorb heat again to form a cycle. This is the primary heating of the primary network return water when the wind is sufficient.

[0067] After the primary heating is completed, the primary network return water can enter the condenser 4 through the valve 16 28, and the condensing agent in the condenser 4 liquefies and releases heat to heat the primary network return water; at the same time, the primary network return water can enter the waste heat exchanger 23 through the valve 13 25 for hot water heat exchange, and the heat source water of the waste heat source 21 at 60-70°C enters the waste heat exchanger 23 through the valve 11 22 for heat exchange, and the heat source water of the waste heat source 21 further provides heat for the primary network return water. The heat source water of the waste heat source 21 enters the waste heat exchanger 23 for heat exchange, and the temperature decreases after the heat source water enters the waste heat exchanger 23 for heat exchange, and enters the waste heat source 21 again through the valve 9 18 and the waste heat circulation pump 19 to form a cycle. This is the secondary heating of the primary network return water when the wind is sufficient. Preferably, when the heat that can be absorbed by the primary network return water is greater than the heating capacity of the waste heat heating unit and the wind heat unit, open the valve 14 26 to pass part of the primary network return water into the bypass pipe.

[0068] After the secondary heating is completed, the hot network water in the waste heat heating unit, the wind heat unit and the hot network water bypass pipe can be connected to the electric boiler 30 through valve 15 27, valve 17 29 and valve 14 26 respectively, and then heated to the required water supply temperature by the electric boiler 30 and connected to the water supply main pipe through valve 18 31. This is the three-stage heating of the primary network return water when the wind power is sufficient.

[0069] If the wind is insufficient during the heating season, the return water from the primary network will enter the inter-seasonal buried pipe heat storage unit, which will perform primary heating on the return water from the primary network. The return water from the primary network will then be introduced into the waste heat heating unit for secondary heating. The return water from the primary network after the secondary heating will be introduced into the electric boiler heating unit, which will perform tertiary heating on the return water from the primary network. Finally, the return water from the primary network after the tertiary heating will be transmitted to the main water supply pipe.

[0070] Specifically, close valve one 6, valve five 14, valve seven 16, valve eight 17, valve ten 20, valve sixteen 28, and valve seventeen 29, and open valve two 7, valve three 9, valve four 13, valve six 15, valve nine 18, valve eleven 22, valve twelve 24, valve thirteen 25, valve fourteen 26, valve fifteen 27, and valve eighteen 31.

[0071] The hot water in the primary network return water is not higher than 25°C. It first enters the inter-seasonal buried pipe heat storage heat exchanger 10 through valve two 7 and valve three 9 for hot water heat exchange. At the same time, the heat source water in the buried pipe 12 enters the inter-seasonal buried pipe heat storage heat exchanger 10 through valve six 15. The heat source water in the buried pipe 12 further provides heat for the primary network return water, so that the primary network return water temperature rises to the temperature allowed by the condenser 4 inlet. The heat source water in the buried pipe 12 enters the inter-seasonal buried pipe heat storage heat exchanger 10 for heat exchange, and the temperature decreases after the heat source water in the buried pipe 12 enters the inter-seasonal buried pipe heat storage heat exchanger 10 for heat exchange. It is pumped to the buried pipe 12 through the inter-seasonal buried pipe heat storage circulation pump 11 to absorb heat again to form a circulation. This is the primary heating of the primary network return water when the wind is sufficient.

[0072] After the primary heating is completed, the primary network return water can enter the waste heat exchanger 23 through the valve thirteen 25 for hot water heat exchange, and the heat source water in the waste heat source 21 at 60-70°C enters the waste heat exchanger 23 through the valve eleven 22 for heat exchange, and the heat source water of the waste heat source 21 further provides heat for the primary network return water. The heat source water of the waste heat source 21 enters the waste heat exchanger 23 and the temperature decreases after heat exchange, and enters the waste heat source 21 again through the valve nine 18 and the waste heat circulation pump 19 to form a cycle. This is the secondary heating of the primary network return water when the wind is sufficient. Preferably, when the heat that can be absorbed by the primary network return water is greater than the heating capacity of the waste heat heating unit, open the valve fourteen 26 to pass part of the primary network return water into the hot network water bypass pipe.

[0073] After the secondary heating is completed, the hot network water in the waste heat heating unit and the hot network water bypass pipe can be connected to the electric boiler 30 through valve 15 27 and valve 14 26 respectively, and then heated to the required water supply temperature by the electric boiler 30 and connected to the water supply main pipe through valve 18 31. This is the three-stage heating of the primary network return water when the wind power is sufficient.

[0074] It can be understood that the method meets the needs of centralized heating through the three-stage heating of the complementary clean heating system with large temperature difference. Multiple energy sources can supplement each other's heat energy, avoiding problems such as uneven distribution in time and space, unstable input, and influence of objective factors. It improves the stability of renewable energy heating and realizes full utilization of energy, thereby improving energy utilization efficiency.

[0075] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A complementary clean heating system with large temperature difference heating, characterized in that: include: Wind-heating units, inter-seasonal buried heat storage units, waste heat heating units, electric boiler heating units and water supply main pipes, The heat source water outlet of the waste heat heating unit is connected to the water inlet of the inter-seasonal buried pipe thermal storage unit, and the water outlet of the inter-seasonal buried pipe thermal storage unit is connected to the heat source water inlet of the waste heat heating unit; The hot network water inlet of the wind thermal unit is connected to the primary network return water, the hot network water inlet of the cross-seasonal buried pipe heat storage unit is connected to the hot network water outlet of the wind thermal unit, the hot network water outlet of the cross-seasonal buried pipe heat storage unit is connected to the hot network water inlet of the waste heat heating unit, the hot network water outlet of the waste heat heating unit is connected to the hot network water inlet of the electric boiler heating unit, the hot network water outlet of the cross-seasonal buried pipe heat storage unit is connected to the hot network water inlet of the wind thermal unit, the hot network water outlet of the wind thermal unit is connected to the hot network water inlet of the electric boiler heating unit, and the hot network water outlet of the electric boiler heating unit is connected to the inlet of the water supply mother pipe.

2. The complementary clean heating system with large temperature difference heating as claimed in claim 1, characterized in that: The wind-heating unit includes a fan impeller, a gear box, a compressor, a condenser, an expansion valve and an evaporator; The primary network return water is connected to the hot network water inlet of the evaporator, the hot network water outlet of the evaporator is connected to the hot network water inlet of the inter-seasonal buried pipe thermal storage unit, the hot network water outlet of the inter-seasonal buried pipe thermal storage unit is connected to the hot network water inlet of the condenser, and the hot network water outlet of the condenser is connected to the hot network water inlet of the electric boiler heating unit; The fan impeller is fixedly connected to the compressor through the gear box, the cold mass outlet of the compressor is connected to the cold mass inlet of the condenser, the cold mass outlet of the condenser is connected to the expansion valve inlet, the expansion valve outlet is connected to the cold mass inlet of the evaporator, and the cold mass outlet of the evaporator is connected to the cold mass inlet of the compressor.

3. The complementary clean heating system with large temperature difference heating as claimed in claim 1, characterized in that: The inter-seasonal buried pipe heat storage unit comprises an inter-seasonal buried pipe heat storage heat exchanger, an inter-seasonal buried pipe heat storage circulation pump and a buried pipe; The primary network return water is connected to the hot network water inlet of the inter-seasonal buried pipe heat storage heat exchanger, and the hot network water outlet of the inter-seasonal buried pipe heat storage heat exchanger is respectively connected to the hot network water inlet of the waste heat heating unit and the hot network water inlet of the wind heat unit; The heat source water outlet of the underground pipe is connected to the heat source water inlet of the inter-seasonal buried pipe heat storage heat exchanger, the heat source water outlet of the inter-seasonal buried pipe heat storage heat exchanger is connected to the heat source water inlet of the underground pipe, and the heat source water inlet of the underground pipe is installed with the inter-seasonal buried pipe heat storage 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, and the heat source water outlet of the buried pipe is connected to the heat source water inlet of the waste heat heating unit.

4. The complementary clean heating system with large temperature difference heating as claimed in claim 1, characterized in that: The waste heat heating unit comprises a waste heat circulation pump, a waste heat source and a waste heat exchanger; The hot water outlet of the inter-seasonal buried pipe heat storage unit is connected to the hot water inlet of the waste heat exchanger, and the hot water outlet of the waste heat exchanger is connected to the hot water inlet of the electric boiler heating unit; The heat source water outlet of the waste 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 source, and the heat source water inlet of the waste heat source is installed with the waste heat circulation pump; The heat source water outlet of the waste heat source is connected to the water inlet of the inter-seasonal buried pipe thermal storage unit, and the water outlet of the inter-seasonal buried pipe thermal storage unit is connected to the heat source water inlet of the waste heat source.

5. The complementary clean heating system with large temperature difference heating as claimed in claim 1, characterized in that: The electric boiler heating unit includes an electric boiler, the hot network water outlet of the waste heat heating unit and the hot network water outlet of the wind heat unit are both connected to the hot network water inlet of the electric boiler, and the hot network water outlet of the electric boiler is connected to the water inlet of the water supply main pipe.

6. The complementary clean heating system for large temperature difference heating according to any one of claims 1 to 5, characterized in that: The complementary clean heating system for large temperature difference heating also includes a heating network water bypass pipe, the heating network water outlet of the inter-seasonal buried pipe heat storage unit is connected to the water inlet of the heating network water bypass pipe, and the water outlet of the heating network water bypass pipe is connected to the heating network water inlet of the electric boiler heating unit.

7. A method for the complementary clean heating system with large temperature difference heating as claimed in claim 1, characterized in that: The steps include: determining whether the system is operating in the heating season; If it is not operated in the heating season, the wind-heating unit and the electric boiler heating unit are both in a shutdown state, and the waste heat heating unit flows the heat source water into the inter-seasonal buried pipe heat storage unit for heat storage; If it is operated during the heating season, determine whether the wind is sufficient; If the wind is sufficient in the heating season, the primary network return water enters the wind-heating unit as a low-temperature heat source, and the primary network return water after the temperature is reduced enters the inter-seasonal buried pipe heat storage unit, and the inter-seasonal buried pipe heat storage unit performs primary heating on the primary network return water, and then the primary network return water is passed into the wind-heating unit and the waste heat heating unit for secondary heating, and the primary network return water after the secondary heating is passed into the electric boiler heating unit, and the electric boiler heating unit performs tertiary heating on the primary network return water, and finally transmits the primary network return water after the tertiary heating to the water supply mother pipe; If the wind is insufficient during the heating season, the return water from the primary network will enter the inter-seasonal buried pipe heat storage unit, which will perform primary heating on the return water from the primary network. The return water from the primary network will then be introduced into the waste heat heating unit for secondary heating. The return water from the primary network after the secondary heating will be introduced into the electric boiler heating unit, which will perform tertiary heating on the return water from the primary network. Finally, the return water from the primary network after the tertiary heating will be transmitted to the main water supply pipe.

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