A zero-carbon heating system based on green electricity and power grid cooperation

Abstract

The utility model relates to a zero carbon heat supply system based on green electricity and power grid cooperation belongs to the field of energy -conserving and environment -protecting technology, sewage heat exchanger provides heat source for electric compression type heat pump evaporation side, electric compression type heat pump condensing side is provided with the medium outlet pipeline and the medium inlet pipeline of heating to be waited for, electric compression type heat pump compressor and green electricity system electricity is connected. Through the collaborative design of the heat storage unit and the liquid return storage unit, the day and night heat supply load is effectively balanced. During the daytime working condition, the heat storage unit stores the excess heat generated by the heat pump, and the heat storage is controlled through the first valve and the night heat supply circulating pump. When the green electricity supply is insufficient at night, the heat storage unit releases heat, and the liquid return storage unit collects low-temperature liquid return to maintain medium circulation. At the same time, the inverter is connected to the power grid to realize "off-grid / grid-connected" dual mode, and the power storage unit ensures power stability.

Description

Technical Field

[0001] This utility model belongs to the field of energy conservation and environmental protection technology, and in particular relates to a zero-carbon heating system based on the synergy of green electricity and power grid. Background Technology

[0002] Zero-carbon heating technology is a heating solution aimed at minimizing or approaching zero carbon emissions during energy utilization. Its core principle is to integrate low-grade waste heat recovery with clean energy-driven technologies to construct an efficient, low-carbon heating system.

[0003] Traditional heating systems rely heavily on fossil fuels such as coal and natural gas, which produce large amounts of carbon dioxide during combustion, failing to meet the "dual carbon" target requirements. Even if an electrically driven heat pump system is used, if the electricity comes from thermal power plants, it still cannot fundamentally reduce carbon emissions. Utility Model Content

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a carbon, comprising: a sewage heat exchanger, wherein the sewage heat exchanger provides a heat source for the evaporation side of an electric compression heat pump, wherein the condensation side of the electric compression heat pump is provided with an outlet pipe for the medium to be heated and an inlet pipe for the medium to be heated, and wherein the electric compression heat pump compressor is electrically connected to a green electricity system.

[0005] Furthermore, a heat storage unit is connected in parallel to the outlet pipeline of the medium to be heated, and a return liquid storage unit is connected in parallel to the inlet pipeline of the medium to be heated.

[0006] Furthermore, the inlet pipe of the medium to be heated and the outlet pipe of the medium to be heated are connected through heat user equipment or industrial heat equipment.

[0007] Furthermore, a first valve and a nighttime heating circulation pump are installed on the pipeline between the outlet pipeline of the medium to be heated and the heat storage unit.

[0008] Furthermore, a second valve and a daytime return water circulation pump are installed on the pipeline between the inlet pipeline of the medium to be heated and the return liquid storage unit.

[0009] Furthermore, a user heat circulation pump is installed on the inlet pipe of the medium to be heated.

[0010] Furthermore, the heat storage unit is an electrically heated heat storage box.

[0011] Furthermore, the wastewater heat exchanger is a flow channel type wastewater heat exchanger, a partition wall type heat exchanger, or a flash heat exchanger.

[0012] Furthermore, a heat extraction pump is installed on the waste heat side of the wastewater heat exchanger.

[0013] Furthermore, the green electricity system includes a green electricity generation unit, which is electrically connected to an energy storage unit and an electric compression heat pump compressor via an inverter.

[0014] Furthermore, the green electricity generation unit is electrically connected to the heat pump, the user heat circulation pump, the daytime return water circulation pump, and the thermal storage unit via an inverter.

[0015] Furthermore, the inverter is connected to the power grid.

[0016] The beneficial effects of this utility model are:

[0017] This application achieves deep carbon reduction through a dual design of "low-grade waste heat recovery + green electricity drive". The wastewater heat exchanger extracts low-grade waste heat from wastewater, providing a heat source for the electric compression heat pump. Various types, such as flow-through, indirect-flow, or flash-type, are adapted to different water quality scenarios. Combined with the waste heat-side heat extraction pump, it achieves cascaded heat utilization, significantly reducing reliance on high-grade energy. Simultaneously, the electric compression heat pump compressor, heat extraction pump, and circulating pump are all powered by a green electricity system. Green electricity generation units, such as photovoltaic and wind power, are converted into electricity by inverters, and energy storage units smooth out fluctuations, eliminating carbon emissions from fossil fuel combustion at the energy source. This design efficiently recovers waste heat wasted in traditional processes and replaces traditional power with clean energy, achieving the dual environmental benefits of "zero-carbon drive + full utilization of waste heat".

[0018] This application effectively balances daytime and nighttime heating loads through the coordinated design of a thermal storage unit and a return liquid storage unit. During daytime operation, the thermal storage unit stores excess heat generated by the heat pump, controlling heat storage through a first valve and a nighttime heating circulation pump. When green electricity supply is insufficient at night, the thermal storage unit releases heat, and the return liquid storage unit collects low-temperature return liquid to maintain medium circulation. Simultaneously, the inverter connects to the grid to achieve dual "off-grid / grid-connected" modes, while the energy storage unit ensures stable power supply. This design ensures continuous heating even during periods of fluctuating green electricity supply or at night, reducing energy waste and improving equipment utilization. Furthermore, precise control of the medium flow rate by components such as the user's heat circulation pump further reduces operating energy consumption, achieving a win-win situation for both environmental protection and economic efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model. Reference numerals indicate the following components: wastewater heat exchanger 100, electric compression heat pump 200, outlet pipe for the medium to be heated 300, inlet pipe for the medium to be heated 400, heat storage unit 500, return liquid storage unit 600, green electricity system 700, green electricity generation unit 710, inverter 720, electricity storage unit 730, first valve 800, nighttime heating circulation pump 900, second valve 1000, daytime return water circulation pump 1100, user heat circulation pump 1200, and heat extraction pump 1300. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The present invention will be further described below with reference to embodiments and accompanying drawings: A zero-carbon heating system based on green electricity and grid coordination includes: a wastewater heat exchanger 100, which provides a heat source for the evaporation side of an electric compression heat pump 200; the condensation side of the electric compression heat pump 200 is provided with a heating medium outlet pipe 300 and a heating medium inlet pipe 400; the compressor of the electric compression heat pump 200 is electrically connected to a green electricity system 700. A heat storage unit 500 is connected in parallel to the heating medium outlet pipe 300, and a return liquid storage unit 600 is connected in parallel to the heating medium inlet pipe 400. The heating medium inlet pipe 400 and the heating medium outlet pipe 300 are connected through heat user equipment or industrial heat equipment. A first valve 800 and a nighttime heating circulation pump 900 are provided on the pipe between the heating medium outlet pipe 300 and the heat storage unit 500. A second valve 1000 and a daytime return water circulation pump 1100 are installed on the pipeline between the inlet pipeline 400 of the medium to be heated and the return liquid storage unit 600. A user heat circulation pump 1200 is installed on the inlet pipeline 400 of the medium to be heated. The heat storage unit 500 is an electrically heated heat storage tank. The sewage heat exchanger 100 is a flow channel type sewage heat exchanger, a partition wall type heat exchanger, or a flash heat exchanger. A heat extraction pump 1300 is installed on the waste heat side of the sewage heat exchanger 100. The green electricity system 700 includes: a green electricity generation unit 710, which is electrically connected to the energy storage unit 730 and the compressor of the electric compression heat pump 200 through an inverter 720. The green electricity generation unit 710 is electrically connected to the heat extraction pump 1300, the user heat circulation pump 1200, the daytime return water circulation pump 1100, and the heat storage unit 500 through the inverter 720. The inverter 720 is connected to the power grid.

[0023] The wastewater heat exchanger 100 is the core heat source acquisition device of the system. Its core function is to extract low-grade waste heat from wastewater to provide a heat source for the evaporation side of the electric compression heat pump 200. It can be of different types, such as flow channel type, indirect wall type, or flash type. Flow channel type wastewater heat exchangers reduce clogging by impurities in the wastewater through optimized flow channel design, improving heat exchange efficiency. Indirect wall type heat exchangers separate the wastewater from the heat pump working fluid through solid walls, avoiding direct contact between the two, and are suitable for scenarios with poor water quality. Flash type heat exchangers generate steam through wastewater depressurization and flash evaporation, enhancing the heat exchange effect. Regardless of the type used, the wastewater heat exchanger 100 can efficiently recover the wastewater waste heat wasted in traditional processes, significantly reducing the system's dependence on high-grade energy, laying the energy foundation for subsequent heat pump heating, and reducing carbon emissions at the source. Simultaneously, a heat extraction pump 1300 is installed on the waste heat side, enabling secondary recovery of waste heat from the wastewater, further improving energy utilization and achieving the effect of "tiered heat use and maximizing energy utilization."

[0024] The electric compression heat pump 200 is the core equipment for heat enhancement in the system. Based on the heat pump cycle principle, it uses a compressor to consume electrical energy to drive the working fluid to circulate between the evaporation and condensation sides, achieving the transfer of heat from low to high grade. Specifically, its evaporation side absorbs waste heat provided by the sewage heat exchanger 100, and the working fluid evaporates and vaporizes. Under the action of the compressor, the pressure and temperature of the gaseous working fluid increase, and it releases heat upon entering the condensation side, heating the medium to be heated flowing through the condensation side. The compressor is explicitly connected to the green electricity system 700. This design ensures that the heat pump operates using clean energy, eliminating carbon emissions from the power source and achieving "zero-carbon drive."

[0025] The outlet pipe 300 and inlet pipe 400 of the medium to be heated together constitute the circulation channel for the medium, which is the "vascular system" for heat transfer. The outlet pipe 300 is responsible for transporting the high-temperature medium, heated by the condenser side of the electric compression heat pump 200, to downstream equipment, while the inlet pipe 400 returns the low-temperature medium, after releasing heat, to the condenser side of the heat pump for reheating. The two are connected through heat user equipment or industrial heat-using equipment to form a complete heating cycle, ensuring that heat is stably delivered from the heat pump to the heat-using terminal. The arrangement of these two pipes enables directional heat transfer, avoids heat loss, and provides a basis for the modular design of the system, facilitating the connection of subsequent auxiliary equipment such as heat storage units and return liquid storage units.

[0026] The thermal storage unit 500 stores excess heat generated by the daytime electric compression heat pump 200. At night, the stored heat is released by the nighttime heating circulation pump 900 to supplement heating demand, ensuring stable operation of the system even when the supply of green electricity and stored electricity is insufficient. This effectively balances the daytime and nighttime heating loads and improves overall energy efficiency. Through this complementary mechanism, the system not only optimizes energy utilization efficiency but also significantly reduces operating costs, achieving a win-win situation for both environmental protection and economic benefits.

[0027] When the electric compression heat pump 200 is not working, the return liquid storage unit 600 collects the medium flowing out of the heat storage unit 500 to ensure continuous circulation of the medium in the system and maintain basic heating demand.

[0028] The Green Electricity System 700 is the core energy source for achieving the "zero carbon" goal of the system. Its function is to provide clean electricity for the entire system, eliminating carbon emissions at the energy source. It includes a Green Electricity Generation Unit 710, an Inverter 720, and an Energy Storage Unit 730. The Green Electricity Generation Unit 710 can use renewable energy technologies such as solar photovoltaic and wind power to directly generate direct current (DC). The Inverter 720 converts the DC power into alternating current (AC) power required by the system, supplying power to the electric compression heat pump 200 compressor and the energy storage unit 730. The energy storage unit 730 stores excess energy from the Green Electricity Generation Unit 710, releasing it when power generation is insufficient to ensure system power stability. Its power supply range is further expanded to cover the heat pump 1300, the user heat circulation pump 1200, the daytime return water circulation pump 1100, and the thermal storage unit 500, enabling clean energy drive for all core equipment in the system. The inverter 720 is connected to the grid. This design allows the system to supplement power from the grid when green electricity is insufficient and to feed power back to the grid when green electricity is abundant. This not only ensures the reliability of power supply but also improves the utilization rate of clean energy and achieves synergistic optimization with the external grid.

[0029] The first valve 800 is located on the pipeline between the outlet pipeline 300 of the medium to be heated and the heat storage unit 500, and acts as a "switch" to control whether the heat storage unit is connected. Its function is to switch the flow path according to operating conditions: during the day when heat storage is needed, the valve opens, allowing the high-temperature medium to flow into the heat storage unit 500; at night, when heat storage is not needed or heat needs to be released, the valve closes or adjusts its opening to control the medium flow. Through precise control, the first valve 800 ensures the orderly progress of the heat storage process, avoids heat loss when unnecessary, and improves the system's energy management accuracy.

[0030] The nighttime heating circulation pump 900, used in conjunction with the first valve 800, is installed on the outlet pipeline of the heat storage unit 500. Its function is to provide power for the medium to flow out of the heat storage unit 500. During the nighttime heat storage phase, the circulation pump starts, overcoming pipeline resistance to transport the high-temperature medium from the heat storage unit 500 to the heat user, ensuring stable medium flow rate and volume during the heat storage process. Its operation is powered by the green electricity system 700, avoiding additional carbon emissions. Furthermore, the heat storage rate can be flexibly controlled by adjusting the pump's power to adapt to different green electricity supply intensities.

[0031] The Green Power Generation Unit 710 is the core of the Green Power System 700's energy production, converting renewable energy sources such as solar and wind power into electricity. For example, solar photovoltaic panels convert sunlight into direct current through the photoelectric effect, while wind turbines generate electricity by driving generators through blade rotation. As the system's "zero-carbon power source," it directly determines the system's clean energy ratio; the stronger the power generation capacity, the lower the system's dependence on traditional fossil fuels, and the more significant the carbon emission reduction effect. Through large-scale deployment, the Green Power Generation Unit 710 can meet most of the system's electricity needs, providing fundamental support for the zero-carbon goal.

[0032] Inverter 720 is the power conversion hub of the green energy system 700. Its function is to convert the direct current (DC) generated by the green energy generation unit 710 into alternating current (AC) that conforms to the equipment and grid standards. Since photovoltaic and wind power generation units output DC, while equipment such as heat pumps, pumps, and thermal storage units within the system require AC power, inverter 720 achieves power form conversion through rectification, filtering, and inversion processes, ensuring the normal operation of the equipment. Simultaneously, inverter 720 is connected to the grid, enabling it to operate in both off-grid and grid-connected modes: ensuring independent power supply to the system when off-grid, and enabling bidirectional power flow when connected to the grid. This solves the problem of unstable green energy supply and improves the utilization efficiency of clean energy.

[0033] Energy storage unit 730 is a power buffer device in the green energy system 700. Its function is to store excess energy from the green energy generation unit 710 and release it when power generation is insufficient, thus mitigating fluctuations in green energy supply. Since solar and wind power are significantly affected by weather, resulting in intermittent fluctuations in power generation, energy storage unit 730 stores excess electricity through charging and discharges it at night when there is no sunlight or wind, or during peak electricity demand, ensuring a continuous and stable power supply for the system. Its capacity design must match the system's power load and the fluctuating characteristics of green energy. Through reasonable charge and discharge control, the system's green energy utilization rate can be increased to over 80%, reducing reliance on grid supplementation and enhancing the zero-carbon effect. Working process.

[0034] Daytime operating conditions:

[0035] The green electricity generation unit 710 obtains green electricity and provides power to the compressors of the heat pump 1300, the electric compression heat pump 200, and the energy storage unit 730 through the inverter 720. The electric compression heat pump 200 obtains waste heat or other waste heat from the site through the sewage heat exchanger 100. After the temperature is increased by the electric compression heat pump 200, it is directly used for heat users or industrial heat. At the same time, the first valve 800 is opened to store the excess heat medium in the heat storage unit 500. When the temperature of the medium in the heat storage unit 500 decreases, the heat storage unit 500 uses green electricity for electric heating to maintain the heat quality.

[0036] Nighttime Operation 1:

[0037] When the green power generation unit 710 stops working, the inverter 720 switches to grid-connected mode to provide grid power to the heat pump 1300 and the electric compression heat pump 200, which can maintain the basic operation of the system.

[0038] Nighttime Operation 2:

[0039] When the green electricity generation unit 710 stops working, the inverter 720 is not connected to the grid, and the energy storage unit 730 provides power to the heat pump 1300 and the electric compression heat pump 200.

[0040] Nighttime Operation Condition 3:

[0041] When the green power generation unit 710 stops working and the inverter 720 is not connected to the grid, the energy storage unit 730 provides power to the nighttime heating circulation pump 900. The first valve 800 is closed and the second valve 1000 is opened. The nighttime heating circulation pump 900 circulates the high-temperature medium in the heat storage unit 500 to the heat users to ensure the nighttime heating demand. The return liquid storage unit 600 collects the return liquid, and after heat exchange, it is stored again to maintain the system's thermal balance, ensure continuous heating, and improve overall energy efficiency.

[0042] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made in accordance with the claims of this utility model should still fall within the patent coverage of this utility model.

Claims

1. A zero-carbon heating system based on green electricity and grid coordination, comprising: Wastewater heat exchanger (100), which provides a heat source for the evaporation of an electric compression heat pump (200), wherein the condenser side of the electric compression heat pump (200) is provided with an outlet pipe (300) for the medium to be heated and an inlet pipe (400) for the medium to be heated, wherein the compressor of the electric compression heat pump (200) is electrically connected to a green electricity system (700).

2. The zero-carbon heating system based on green electricity and grid coordination according to claim 1, characterized in that, The outlet pipe (300) of the medium to be heated is connected in parallel with a heat storage unit (500), and the inlet pipe (400) of the medium to be heated is connected in parallel with a return liquid storage unit (600).

3. The zero-carbon heating system based on green electricity and grid coordination according to claim 2, characterized in that, The inlet pipe (400) of the medium to be heated and the outlet pipe (300) of the medium to be heated are connected through heat user equipment or industrial heat equipment.

4. The zero-carbon heating system based on green electricity and grid coordination according to claim 3, characterized in that, A first valve (800) and a nighttime heating circulation pump (900) are installed on the pipeline between the outlet pipeline (300) of the medium to be heated and the heat storage unit (500).

5. The zero-carbon heating system based on green electricity and grid coordination according to claim 3, characterized in that, A second valve (1000) and a daytime return water circulation pump (1100) are installed on the pipeline between the inlet pipeline (400) of the medium to be heated and the return liquid storage unit (600).

6. The zero-carbon heating system based on green electricity and grid coordination according to claim 3, characterized in that, A user heat circulation pump (1200) is installed on the inlet pipe (400) of the medium to be heated.

7. The zero-carbon heating system based on green electricity and grid coordination according to claim 2, characterized in that, The heat storage unit (500) is an electrically heated heat storage box.

8. The zero-carbon heating system based on green electricity and grid coordination according to claim 1, characterized in that, The wastewater heat exchanger (100) is a flow channel type wastewater heat exchanger, a partition wall type heat exchanger, or a flash heat exchanger.

9. The zero-carbon heating system based on green electricity and grid coordination according to claim 1, characterized in that, A heat pump (1300) is installed on the waste heat side of the wastewater heat exchanger (100).

10. The zero-carbon heating system based on green electricity and grid coordination according to claim 1, characterized in that, The green electricity system (700) includes a green electricity generation unit (710), which is electrically connected to the energy storage unit (730) and the compressor of the electric compression heat pump (200) via an inverter (720).

11. The zero-carbon heating system based on green electricity and grid coordination according to claim 10, characterized in that, The green electricity generation unit (710) is electrically connected to the heat pump (1300), the user heat circulation pump (1200), the daytime return water circulation pump (1100) and the heat storage unit (500) respectively via the inverter (720).

12. The zero-carbon heating system based on green electricity and grid coordination according to claim 11, characterized in that, The inverter (720) is connected to the power grid.

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