CN-121993919-A - Hybrid energy station and control method thereof

Abstract

The invention discloses a hybrid energy station and a control method thereof, wherein the hybrid energy station comprises a heat pump unit, a boiler with a burner and a hot water defrosting branch, a refrigerant loop of the heat pump unit comprises a compressor, a water side heat exchanger, a main throttle valve and an outdoor heat exchanger which are sequentially connected, a waterway outlet of the water side heat exchanger is connected with a water inlet of the burner in series through a pipeline, a water outlet of the burner is connected with a water supply pipe, the hot water defrosting branch comprises defrosting hot water coils distributed in the outdoor heat exchanger, a water inlet end of each defrosting hot water coil is connected with an outlet side pipeline of the burner, and a water outlet end of each defrosting hot water coil is connected with an inlet side pipeline of the burner. The invention integrates multiple functions (heat supply, defrosting and waste heat recovery) into one device, and the design of accurate control logic and a waste heat recovery loop is beneficial to solving the defrosting defect and stabilizing the heat supply effect in the prior art, thereby improving the reliability and the service life of the whole system.

Inventors

• TAN CHAOYANG
• XU NUO

Assignees

• 谈朝阳
• 许诺

Dates

Publication Date

20260508

Application Date

20260206

Claims (10)

1. 1. The mixed energy station comprises a heat pump unit and a boiler with a burner, wherein a refrigerant loop of the heat pump unit comprises a compressor, a water side heat exchanger, a main throttle valve and an outdoor heat exchanger which are sequentially connected, a waterway outlet of the water side heat exchanger is connected with a water inlet of the burner in series through a pipeline, and a water outlet of the burner is connected with a water supply pipe; The hot water defrosting device is characterized by further comprising a hot water defrosting branch, wherein the hot water defrosting branch comprises defrosting hot water coils distributed in the outdoor heat exchanger, the water inlet ends of the defrosting hot water coils are connected with an outlet side pipeline of the combustor, and the water outlet ends of the defrosting hot water coils are connected with an inlet side pipeline of the combustor.
2. 2. The hybrid power station as set forth in claim 1, further comprising a waste heat recovery line; The waste heat recovery pipeline comprises a secondary throttle valve and a flue gas evaporator which are arranged in series, the inlet end of the waste heat recovery pipeline is connected to a pipeline between the heating refrigerant outlet of the water side heat exchanger and the inlet of the main throttle valve, and the outlet end of the waste heat recovery pipeline is connected to a pipeline between the outlet of the outdoor heat exchanger and the air suction port of the compressor; The smoke outlet of the burner is communicated with the smoke evaporator through a smoke pipeline, and the smoke evaporator is positioned on the air inlet side of the outdoor heat exchanger.
3. 3. The hybrid energy station of claim 2, wherein the outdoor fan of the heat pump unit drives an airflow to flow upwards through the flue gas evaporator and the outdoor heat exchanger in sequence, the outdoor heat exchanger and the flue gas evaporator are obliquely installed, and the flue gas evaporator is attached to the lower portion of the outdoor heat exchanger.
4. 4. A hybrid energy station according to claim 3, wherein the flue gas evaporator is provided with a flue gas heat exchange tube inclined downwards section by section, the top of the flue gas heat exchange tube is provided with a flue inlet communicated with the flue gas pipeline, and the bottom of the flue gas heat exchange tube is provided with a bent upwards flue gas section.
5. 5. A hybrid energy station as claimed in claim 3, wherein a water tray is provided below the flue gas evaporator, the water tray being connected to a drain pipe.
6. 6. The hybrid power station of claim 1, wherein the refrigerant circuit further comprises a four-way reversing valve having a first end connected to a heated refrigerant outlet of the outdoor heat exchanger, a second end connected to a suction side of the compressor, a third end connected to a heated refrigerant inlet of the water side heat exchanger, and a fourth end connected to a discharge side of the compressor.
7. 7. The hybrid energy station of claim 1, wherein the water side heat exchanger is a shell and tube heat exchanger and the outdoor heat exchanger is a fin heat exchanger.
8. 8. A control method of a hybrid power station, the control method being applied to the hybrid power station according to any one of claims 2 to 5, characterized in that the control method comprises: acquiring an operation mode of the hybrid energy station; In a heating mode, detecting working parameters of the hybrid energy station, and judging whether a defrosting entering condition or a heat supplementing entering condition is set or not; If yes, starting the burner when the set defrosting entry condition is met, and connecting the defrosting hot water coil and the waste heat recovery pipeline until the set defrosting exit condition is met; If not, closing the burner, and closing the defrosting hot water coil pipe and the waste heat recovery pipeline.
9. 9. The control method according to claim 8, wherein the set defrost entry condition includes at least one of a set defrost interval entry condition and a set defrost point entry condition, and the set defrost exit condition includes at least one of a set defrost interval exit condition and a set defrost point exit condition; The set defrosting interval entering condition is defrosting interval time calculated according to actual outdoor environment temperature, and when the actual interval time between the current and the subsequent defrosting actions reaches the defrosting interval time, the set defrosting interval entering condition is judged to be met; The set defrosting interval exit condition is set defrosting duration, and when a single defrosting action reaches the set defrosting duration, the set defrosting interval exit condition is judged to be met; The set defrosting point entering condition is set defrosting entering temperature, and when the actual tube temperature T Wing of the outdoor heat exchanger reaches the set defrosting entering temperature, the set defrosting point entering condition is judged to be met; And the set defrosting point exit condition is set defrosting exit temperature, and when the actual tube temperature T Wing of the outdoor heat exchanger reaches the set defrosting exit temperature, the set defrosting point exit condition is judged to be met.
10. 10. The control method according to claim 8, wherein the set heat replenishment entry condition is a set replenishment entry temperature, and when an actual water supply temperature T Feed device of the water supply pipe falls to the set replenishment entry temperature, it is determined that the set heat replenishment entry condition is satisfied; The set heat supplementary exit condition is a set supplementary exit temperature, and when the actual water supply temperature T Feed device of the water supply pipe rises to the set supplementary exit temperature, the set heat supplementary exit condition is judged to be satisfied.

Description

Hybrid energy station and control method thereof Technical Field The invention relates to the technical field of energy supply equipment, in particular to a hybrid energy station and a control method thereof. Background With the improvement of energy-saving and environment-friendly requirements, the air-source heat pump is widely applied to the field of cooling and heating. However, when the traditional air-source heat pump operates in a low-temperature high-humidity environment, the surface of the outdoor fin type heat exchanger is extremely prone to frosting, so that the heat exchange efficiency is drastically reduced. The main current defrosting mode is to change the system into refrigeration cycle by reversing through a four-way valve, and defrost by utilizing the heat extracted from the indoor side. The reverse circulation defrosting or hot gas bypass defrosting mode has the obvious defects that normal heat supply to a user is interrupted, a large amount of electric energy is consumed to compensate heat loss caused by defrosting, the overall energy efficiency ratio (COP) of the system in winter is greatly reduced, and the energy supply is unstable. In order to improve the energy supply guarantee rate in extreme weather, the prior art provides a scheme for coupling multiple energy sources such as a heat pump and a boiler. However, such systems tend to be complex in structure and energy utilization efficiency remains to be optimized. Specifically, on one hand, the waste heat of flue gas generated by boiler combustion is directly discharged without deep utilization, so that energy waste is caused, and on the other hand, when the system is switched in a mode and adjusted in a load, the control precision of the flow of the refrigerant is insufficient, so that the fluctuation of the return air pressure of the compressor is easily caused, and the running stability and the service life of equipment are influenced. Therefore, how to design a defrosting scheme that is efficient, stable and independent of host recoil in such a coupling system, and avoid the energy loss associated with the conventional defrosting method, is still a technical problem to be solved. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a hybrid energy station and a control method thereof, and aims to solve the problems of intermittent defrosting, low energy efficiency and the like in a low-temperature environment of a traditional air energy heat pump, realize stable heat supply of equipment in a wide temperature range (especially-30 ℃ low temperature), and reduce the operation cost. The technical scheme includes that the hybrid energy station comprises a heat pump unit, a boiler with a combustor and a hot water defrosting branch, wherein a refrigerant loop of the heat pump unit comprises a compressor, a water side heat exchanger, a main throttle valve and an outdoor heat exchanger which are sequentially connected, a waterway outlet of the water side heat exchanger is connected with a water inlet of the combustor in series through a pipeline, a water outlet of the combustor is connected with a water supply pipe, the hot water defrosting branch comprises defrosting hot water coils distributed in the outdoor heat exchanger, a water inlet end of each defrosting hot water coil is connected with an outlet side pipeline of the combustor, and a water outlet end of each defrosting hot water coil is connected with an inlet side pipeline of the combustor. The mixed energy station further comprises a waste heat recovery pipeline, wherein the waste heat recovery pipeline comprises a secondary throttle valve and a flue gas evaporator which are arranged in series, the inlet end of the waste heat recovery pipeline is connected to a pipeline between the heating refrigerant outlet of the water side heat exchanger and the inlet of the main throttle valve, the outlet end of the waste heat recovery pipeline is connected to a pipeline between the outlet of the outdoor heat exchanger and the air suction port of the compressor, the smoke outlet of the combustor is communicated with the flue gas evaporator through a flue gas pipeline, and the flue gas evaporator is positioned on the air inlet side of the outdoor heat exchanger. Further, the outdoor fan of the heat pump unit drives airflow to flow upwards and sequentially through the smoke evaporator and the outdoor heat exchanger, the outdoor heat exchanger and the smoke evaporator are obliquely installed, and the smoke evaporator is attached to the lower portion of the outdoor heat exchanger. Further, the flue gas evaporator is provided with a flue gas heat exchange tube which is inclined downwards section by section, the top of the flue gas heat exchange tube is provided with a flue gas inlet communicated with a flue gas pipeline, and the bottom of the flue gas heat exchange tube is provided with a bent upwards flue gas discharging section. Further, a water receivi