Heat pump cycle based on exhaust waste heat recovery and operation control device thereof

Abstract

The utility model relates to a heat pump cycle based on exhaust waste heat recovery and an operation control device thereof, which combine a refrigerating system, a heat pump machine assembly and a water circulation system to achieve the purpose of preparing high-temperature hot water. Exhaust gas of an original refrigerating system is fully used as a heat source, one part is used for heating replenished water in hot water circulation, the other part is used for heat exchange of the evaporator side in a heat pump system, and it is guaranteed that a heat pump unit operates in the stable high-temperature working condition. In addition, waterway elements such as an electric butterfly valve, an electric three-way valve and a temperature sensor are introduced, and reasonable logic control is combined, so that cyclic heating of the water system is realized. The heat pump system conducts energy recovery on exhaust waste heat of the refrigerating system, and comprehensive utilization of energy is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial refrigeration and heat pump energy saving, in particular to a heat pump cycle based on exhaust waste heat recovery and an operation control device thereof. Background Art

[0002] On the one hand, the heat pump is a bridge connecting renewable electricity and thermal energy demand, and on the other hand, it is an excellent option for waste heat recovery.

[0003] The food industry often requires continuous high-temperature hot water to facilitate production, such as scalding and depilation in the poultry industry, cleaning and washing of workshops, hot water for employees' daily life, etc. On the other hand, the hot water supply of many factories is still mainly based on hot water boilers, which has disadvantages in terms of cost, energy consumption, and environmental protection. Summary of the invention

[0004] The technical problem to be solved by the utility model is to meet the demand for comprehensive utilization of energy in the above-mentioned fields such as industrial refrigeration and food processing, and provide a heat pump cycle based on exhaust waste heat recovery and its operation control device, which combines the refrigeration system, the heat pump assembly and the water circulation system to achieve the purpose of producing high-temperature hot water. The utility model relates to a heat pump cycle based on exhaust waste heat recovery and its operation control device, which fully utilizes the exhaust gas of the refrigeration system as a heat source, a part of which is used for heating the replenishing water in the hot water cycle, and the other part is used for heat exchange on the evaporator side of the heat pump system, to ensure the stable high-temperature working conditions of the heat pump unit. In addition, water circuit components such as electric butterfly valves, electric three-way valves, and temperature sensors are introduced, and combined with reasonable logic control, the circulating heating of the water system is realized. The heat pump system recovers the exhaust waste heat of the original refrigeration system and realizes the comprehensive utilization of energy.

[0005] The purpose of the utility model is achieved through the following technical solutions: a heat pump cycle based on exhaust waste heat recovery and its operation control device, including a high-pressure device of a refrigeration system, a heat pump assembly, an internal isolation water circulation assembly, a water replenishment circulation assembly and an external water circulation assembly.

[0006] The high-pressure device of the refrigeration system includes an exhaust main pipe and a liquid main pipe of the refrigeration system, an air inlet pipe and a liquid outlet pipe to the water-supplementing heating heat recovery device, and an air inlet pipe and a liquid outlet pipe to the heat pump assembly; the exhaust main pipe is provided with a first hot gas valve and a second hot gas valve, the air inlet pipe to the water-supplementing heating heat recovery device is provided with a fourth hot gas valve, the liquid main pipe is provided with a first liquid outlet valve, the air inlet pipe to the heat pump assembly is provided with a third hot gas valve, the liquid outlet pipe of the water-supplementing heating heat recovery device is provided with a third liquid outlet valve and a fourth liquid outlet valve, and the liquid outlet pipe of the heat pump assembly is provided with a third liquid outlet valve;

[0007] The heat pump assembly includes a condenser evaporator, a compressor, a condenser and an expansion valve;

[0008] The internal isolation water circulation assembly includes an internal circulation butterfly valve, an expansion tank, an isolation plate heat exchanger and an internal circulation water pump.

[0009] The external water circulation assembly includes a first external circulation water valve, a second external circulation water valve, an external circulation water pump, an external circulation electric butterfly valve, an inlet water temperature sensor, an outlet water temperature sensor, a first electric three-way valve and a second electric three-way valve;

[0010] The water replenishment circulation components include a water replenishment pump, a water replenishment electric butterfly valve, a water replenishment temperature sensor, a water replenishment water tank and a water replenishment water valve.

[0011] A further improvement of the utility model is that the condenser evaporator in the heat pump assembly is provided with a heat pump system liquid supply port and an air return port, a hot gas inlet and a liquid drop outlet, the condenser evaporator supplies liquid to the heat pump compressor, the expansion valve returns air to the condenser evaporator, and heat is exchanged between the hot gas refrigerant and the heat pump refrigerant.

[0012] A further improvement of the utility model is that the condenser in the heat pump assembly has a heat pump exhaust inlet, a heat pump liquid outlet, an internal circulation water inlet and an internal circulation water outlet; the condenser is connected to the heat pump compressor via the heat pump exhaust inlet; the condenser is connected to the expansion valve via the heat pump liquid outlet; an internal circulation butterfly valve is provided at the internal circulation water inlet of the condenser; an internal circulation water pump is provided at the internal circulation water outlet of the condenser; heat exchange is performed between the external circulation water and the internal circulation water to achieve the purpose of heating the external water circulation.

[0013] A further improvement of the utility model is that the isolation plate heat exchanger in the isolation water circulation component comprises an internal circulation water inlet and water outlet, an external water circulation water inlet and water outlet, the internal circulation water and the external circulation water exchange heat, separate soft water and hard water, and realize the isolation of the refrigerant from the external water source; the internal circulation water inlet of the isolation plate heat exchanger is communicated with the internal circulation water pump, the internal circulation water outlet of the isolation plate heat exchanger is communicated with the expansion tank, the external water circulation water inlet of the isolation plate heat exchanger is communicated with the external circulation water pump, and the external water circulation water outlet of the isolation plate heat exchanger is communicated with the first external circulation water valve; a water outlet temperature sensor is provided at the external water circulation water inlet of the isolation plate heat exchanger, and a water inlet temperature sensor is provided at the external water circulation water inlet of the isolation plate heat exchanger.

[0014] A further improvement of the utility model is that the external water circulation component includes a hot water storage tank, a first electric three-way valve and a second electric three-way valve, thereby realizing orderly regulation of the water circulation heating process; the hot water storage tank is connected to the external circulation water pump and the first electric three-way valve through the second electric three-way valve, the other two ends of the first electric three-way valve are respectively connected to the first external circulation water valve and the water replenishment electric butterfly valve, an external circulation electric butterfly valve is provided at the water inlet of the hot water storage tank, and a second external circulation water valve is provided at the water outlet of the hot water storage tank.

[0015] A further improvement of the utility model is that the water replenishment electric butterfly valve in the water replenishment circulation component is connected to the water replenishment heating heat recovery device, the water replenishment water tank is connected to the water replenishment heating heat recovery device through a water replenishment pump, and a water replenishment water valve is provided on the water replenishment water tank.

[0016] A further improvement of the utility model is that a water supply temperature sensor is provided on the pipeline between the water supply electric butterfly valve and the first electric three-way valve.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] (1) The utility model makes full use of the exhaust heat of the original refrigeration system for heat recovery, part of which is used for heating the make-up water, and part of which is used as the heat source of the low-pressure side of the heat pump unit. Under the condition of normal operation of the original refrigeration system, high-temperature hot water required for production and life is produced at the same time, realizing the comprehensive utilization of energy;

[0019] (2) The heat pump water system in the utility model adopts a step-by-step heating method of water replenishment and condenser side circulation, and is equipped with an electric three-way water valve to achieve flexible control of the water system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 It is a control logic schematic diagram of the utility model;

[0022] Numbers in the figure: 1, original refrigeration system; 2, first hot air valve; 3, first drop valve; 4, second hot air valve; 5, second drop valve; 6, third hot air valve; 7, third drop valve; 8, fourth hot air valve; 9, fourth drop valve; 10, water supply heating heat recovery device; 11, water supply electric butterfly valve; 12, water supply pump; 13, water supply water tank; 14, water supply water valve; 15, condenser evaporator; 16, heat pump compressor; 17, expansion valve; 18. Condenser; 19. Internal circulation butterfly valve; 20. Internal circulation water pump; 21. Expansion tank; 22. Isolation plate heat exchanger; 23. Outlet water temperature sensor; 24. Inlet water temperature sensor; 25. Make-up water temperature sensor; 26. First external circulation water valve; 27. External circulation water pump; 28. First electric three-way valve; 29. ​​Second electric three-way valve; 30. External circulation electric butterfly valve; 31. Second external circulation water valve; 32. Heat storage tank. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. The elements and features described in one embodiment of the utility model can be combined with the elements and features shown in one or more other embodiments. It should be noted that for the purpose of clarity, the description omits the representation and description of components and processes that are not related to the utility model and are known to ordinary technicians in this field. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 As shown, a heat pump cycle based on exhaust waste heat recovery and its operation control device, which consists of the high-pressure part of the original refrigeration system, a heat pump assembly, an internal isolation water circulation assembly, a water replenishment circulation assembly, and an external water circulation assembly, which are organically combined to achieve the purpose of producing high-temperature hot water.

[0025] The high-pressure part of the original refrigeration system includes the exhaust main pipe and liquid main pipe of the original refrigeration system, the air inlet pipe and liquid outlet pipe of the water-making up heat recovery device 10, the exhaust main pipe is provided with a first hot air valve 2 and a second hot air valve 4, the air inlet pipe to the water-making up heat recovery device 10 is provided with a fourth hot air valve 8, the liquid main pipe is provided with a first liquid drop valve 3, the air inlet pipe to the heat pump assembly is provided with a third hot air valve 6, the liquid outlet pipe of the water-making up heating heat recovery device 10 is provided with a third liquid drop valve 5 and a fourth liquid drop valve 9, the liquid outlet pipe of the heat pump assembly is provided with a third liquid drop valve 7, and the air inlet and liquid outlet pipes of the condenser evaporator 15 in the heat pump assembly.

[0026] The heat pump assembly includes a condenser evaporator 15, a compressor 16, a condenser 18, and an expansion valve 17. The condenser evaporator 15 is provided with a heat pump system liquid supply and return air port, a hot gas inlet, and a liquid outlet. The condenser evaporator 15 supplies liquid to the heat pump compressor 16, and the expansion valve 17 returns air to the condenser evaporator 15. The original system hot gas refrigerant and the heat pump refrigerant exchange heat to ensure the stability of the evaporation temperature of the heat pump system.

[0027] The condenser 18 in the heat pump assembly has a heat pump exhaust inlet, a heat pump liquid outlet, an internal circulation water inlet and an internal circulation water outlet. The condenser 18 is connected to the heat pump compressor 16 through the heat pump exhaust inlet, and the condenser 18 is connected to the expansion valve 17 through the heat pump liquid outlet. The internal circulation water inlet of the condenser 18 is provided with an internal circulation butterfly valve 19, and the internal circulation water outlet of the condenser 18 is provided with an internal circulation water pump 20. The two exchange heat to achieve the purpose of heating the external water circulation. The two exchange heat to achieve the purpose of heating the external water circulation.

[0028] The internal isolation water circulation assembly includes an internal circulation butterfly valve 19, an expansion tank 21, an isolation plate heat exchanger 22 and an internal circulation water pump 20. The isolation plate heat exchanger 22 includes an internal circulation water inlet and outlet, an external water circulation water inlet and outlet, and the internal circulation water exchanges heat with the external circulation water to separate soft water from hard water, and realizes the isolation of the refrigerant from the external water source. The isolation plate heat exchanger 22 includes an internal circulation water inlet and outlet, an external water circulation water inlet and outlet, the internal circulation water and the external circulation water exchange heat, separate soft water and hard water, and realize the isolation of the refrigerant from the external water source; the internal circulation water inlet of the isolation plate heat exchanger 22 is connected to the internal circulation water pump 20, the internal circulation water outlet of the isolation plate heat exchanger 22 is connected to the expansion tank 21, the external water circulation water inlet of the isolation plate heat exchanger 22 is connected to the external circulation water pump 27, and the external water circulation water outlet of the isolation plate heat exchanger 22 is connected to the first external circulation water valve 26; a water outlet temperature sensor 23 is provided at the external water circulation water inlet of the isolation plate heat exchanger 22, and a water inlet temperature sensor 24 is provided at the external water circulation water inlet of the isolation plate heat exchanger 22.

[0029] The external water circulation assembly includes a first external circulation water valve 26, a second external circulation water valve 31, an external circulation water pump 27, an external circulation electric butterfly valve 30, an inlet water temperature sensor 24, an outlet water temperature sensor 23, a first electric three-way valve 28, and a second electric three-way valve 29; the external water circulation includes the first electric three-way valve 28 and the second electric three-way valve 29, and the orderly regulation of the water circulation heating process is achieved through reasonable control. The external water circulation assembly includes a hot water storage tank 32, a first electric three-way valve 28 and a second electric three-way valve 29, and the orderly regulation of the water circulation heating process is achieved; the hot water storage tank 32 is connected to the external circulation water pump 27 and the first electric three-way valve 28 through the second electric three-way valve 29, and the other two ends of the first electric three-way valve 28 are respectively connected to the first external circulation water valve 26 and the water replenishment electric butterfly valve 11, the water inlet of the hot water storage tank 32 is provided with an external circulation electric butterfly valve 30, and the water outlet of the hot water storage tank 32 is provided with a second external circulation water valve 31.

[0030] The water replenishment circulation assembly includes a water replenishment pump 12, a water replenishment electric butterfly valve 11, a water replenishment temperature sensor 25, a water replenishment water tank 13, and a water replenishment water valve 14. The water replenishment circulation is used as the first step of water heating and is sent to the external water circulation system for subsequent heating. The water replenishment electric butterfly valve 11 is connected to the water replenishment heating heat recovery device 10, and the water replenishment water tank 13 is connected to the water replenishment heating heat recovery device 10 through the water replenishment pump 12. The water replenishment water tank 13 is provided with a water replenishment water valve 14. A water replenishment temperature sensor 25 is provided on the pipeline between the water replenishment electric butterfly valve 11 and the first electric three-way valve 28.

[0031] like Figure 2As shown, a heat pump cycle based on exhaust waste heat recovery and its operation control system, the water system operation control method is as follows:

[0032] When the water system is started, it should first be checked whether the liquid level of the heat storage tank 32 is below the preset value. If it is below the preset value, the water replenishment pump 12 and the water replenishment electric butterfly valve 11 are started. Then adjust the opening of the C port of the first electric three-way valve 28 to 100%, and the corresponding B port to 0%; adjust the opening of the C port of the second electric three-way valve 29 to 100%, and the corresponding B port to 0%. Then, the external circulation water pump 27 is cut into the power frequency operation. Adjust the opening of the C port of the first electric three-way valve 28 to 70%, and the B port to 30% (fixed value adjustable). Set the opening of the C port of the second electric three-way valve 29 to 100%, and the B port to 0%. Thus, the circulation heating mode of the heat storage tank 32 is entered.

[0033] In the circulation heating mode of the hot water storage tank 32, the external circulation water pump 27 switches from industrial frequency to variable frequency, and performs PID adjustment according to the temperature difference between the inlet and outlet water until the temperature of the hot water storage tank 32 reaches the set temperature. The external circulation water pump 27 stops running.

[0034] If the water is stopped after a period of use, the liquid level of the hot water storage tank 32 is detected. If it is higher than the water replenishment heating cycle setting value 2, the hot water storage tank 32 replenishment + external circulation heating mode is entered: the B port opening of the first electric three-way valve 28 is 0%, the C port is 100%, the water replenishment pump 12 is started, and the water replenishment electric butterfly valve 11 is opened; the C port of the second electric three-way valve 29 is set to 50%, and the B port opening is 50% (fixed, adjustable)

[0035] When the liquid level of the hot water storage tank 32 reaches the preset value 1, the opening of the B port of the first electric three-way valve 28 is set to 0%, the C port is set to 100%, the water supply pump 12 is closed, and the water supply electric butterfly valve 11 is closed; the opening of the C port of the second electric three-way valve 29 is 0%, and the opening of the B port is 100%. The external circulation water pump 27 is operated by variable frequency, and PID adjustment is performed according to the temperature difference between the inlet and outlet water until the temperature of the hot water storage tank 32 reaches the set value, and the cycle is repeated.

[0036] Finally, it should be noted that: although the utility model and its advantages have been described in detail above, it should be understood that various changes, substitutions and transformations can be made without exceeding the spirit and scope of the utility model defined by the attached claims. Moreover, the scope of the utility model is not limited to the specific embodiments of the processes, devices, means, methods and steps described in the specification. It will be easily understood by those of ordinary skill in the art from the disclosure of the utility model that according to the utility model, existing and future processes, devices, means, methods or steps that perform substantially the same functions as the corresponding embodiments described herein or obtain substantially the same results as the corresponding embodiments described herein can be used. Therefore, the attached claims are intended to include such processes, devices, means, methods or steps within their scope.

Claims

1. A heat pump cycle based on exhaust waste heat recovery and its operation control device, comprising a high-pressure device of a refrigeration system, a heat pump assembly, an internal isolation water circulation assembly, a water replenishment circulation assembly and an external water circulation assembly, characterized in that: The high-pressure device of the refrigeration system comprises an exhaust main pipe and a liquid main pipe of the refrigeration system (1), an air inlet pipe and a liquid outlet pipe of a water-supplementing heat recovery device (10), and an air inlet pipe and a liquid outlet pipe of a heat pump assembly; the exhaust main pipe is provided with a first hot air valve (2) and a second hot air valve (4), the air inlet pipe of the water-supplementing heat recovery device (10) is provided with a fourth hot air valve (8), the liquid main pipe is provided with a first liquid outlet valve (3), the air inlet pipe of the heat pump assembly is provided with a third hot air valve (6), the liquid outlet pipe of the water-supplementing heat recovery device (10) is provided with a third liquid outlet valve (5) and a fourth liquid outlet valve (9), and the liquid outlet pipe of the heat pump assembly is provided with a third liquid outlet valve (7); The heat pump assembly comprises a condenser evaporator (15), a compressor (16), a condenser (18) and an expansion valve (17); The internal isolation water circulation assembly comprises an internal circulation butterfly valve (19), an expansion tank (21), an isolation plate heat exchanger (22) and an internal circulation water pump (20); The external water circulation assembly comprises a first external circulation water valve (26), a second external circulation water valve (31), an external circulation water pump (27), an external circulation electric butterfly valve (30), an inlet water temperature sensor (24), an outlet water temperature sensor (23), a first electric three-way valve (28) and a second electric three-way valve (29); The water replenishment circulation assembly comprises a water replenishment pump (12), a water replenishment electric butterfly valve (11), a water replenishment temperature sensor (25), a water replenishment water tank (13) and a water replenishment water valve (14).

2. A heat pump cycle based on exhaust waste heat recovery and its operation control device according to claim 1, characterized in that: The condenser evaporator (15) in the heat pump assembly is provided with a heat pump system liquid supply port and a return air port, a hot gas inlet and a liquid drop outlet. The condenser evaporator (15) supplies liquid to the heat pump compressor (16), and the expansion valve (17) returns air to the condenser evaporator (15), so that heat is exchanged between the hot gas refrigerant and the heat pump refrigerant.

3. A heat pump cycle based on exhaust waste heat recovery and its operation control device according to claim 2, characterized in that: The condenser (18) in the heat pump assembly has a heat pump exhaust inlet, a heat pump liquid outlet, an internal circulation water inlet and an internal circulation water outlet. The condenser (18) is connected to the heat pump compressor (16) via the heat pump exhaust inlet. The condenser (18) is connected to the expansion valve (17) via the heat pump liquid outlet. An internal circulation butterfly valve (19) is provided at the internal circulation water inlet of the condenser (18). An internal circulation water pump (20) is provided at the internal circulation water outlet of the condenser (18). Heat exchange is performed between the internal circulation water and the external circulation water, thereby achieving the purpose of heating the external water circulation.

4. A heat pump cycle based on exhaust waste heat recovery and its operation control device according to claim 3, characterized in that: The isolation plate heat exchanger (22) in the isolation water circulation component comprises an internal circulation water inlet and water outlet, an external water circulation water inlet and water outlet, the internal circulation water and the external circulation water perform heat exchange, separate soft water from hard water, and isolate the refrigerant from the external water source; the internal circulation water inlet of the isolation plate heat exchanger (22) is in communication with the internal circulation water pump (20), the internal circulation water outlet of the isolation plate heat exchanger (22) is in communication with the expansion tank (21), the external water circulation water inlet of the isolation plate heat exchanger (22) is in communication with the external circulation water pump (27), and the external water circulation water outlet of the isolation plate heat exchanger (22) is in communication with the first external circulation water valve (26); a water outlet temperature sensor (23) is provided at the external water circulation water inlet of the isolation plate heat exchanger (22), and a water inlet temperature sensor (24) is provided at the external water circulation water inlet of the isolation plate heat exchanger (22).

5. A heat pump cycle based on exhaust waste heat recovery and its operation control device according to claim 4, characterized in that: The external water circulation component comprises a heat storage tank (32), a first electric three-way valve (28) and a second electric three-way valve (29), thereby achieving orderly regulation of the water circulation heating process; the heat storage tank (32) is connected to an external circulation water pump (27) and the first electric three-way valve (28) via the second electric three-way valve (29); the other two ends of the first electric three-way valve (28) are respectively connected to the first external circulation water valve (26) and the water replenishment electric butterfly valve (11); the water inlet of the heat storage tank (32) is provided with an external circulation electric butterfly valve (30); and the water outlet of the heat storage tank (32) is provided with a second external circulation water valve (31).

6. A heat pump cycle based on exhaust waste heat recovery and its operation control device according to claim 5, characterized in that: The water replenishment electric butterfly valve (11) in the water replenishment circulation assembly is connected to the water replenishment heating heat recovery device (10), the water replenishment water tank (13) is connected to the water replenishment heating heat recovery device (10) via a water replenishment pump (12), and a water replenishment water valve (14) is provided on the water replenishment water tank (13).

7. A heat pump cycle based on exhaust waste heat recovery and its operation control device according to claim 5, characterized in that: A water supply temperature sensor (25) is provided on the pipeline between the water supply electric butterfly valve (11) and the first electric three-way valve (28).

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