Dual-energy combined cooling and heating system

Abstract

The utility model discloses a dual-energy combined cooling and heating system, which is used in the technical field of energy equipment and comprises a first heat pump mechanism, a second heat pump mechanism, an intermediate heat exchanger and a water flow pipeline, the first heat pump mechanism is connected with an external client air cooler and used for making the client air cooler conduct refrigeration. The second heat pump mechanism is connected with the water flow pipeline and used for providing heat for the water flow pipeline. And the intermediate heat exchanger is connected with the first heat pump mechanism and the second heat pump mechanism, so that the first heat pump mechanism and the second heat pump mechanism complete heat exchange. According to the scheme, redundant heat generated by the first heat pump mechanism is provided for the second heat pump mechanism through the intermediate heat exchanger, the second heat pump mechanism absorbs heat of the first heat pump mechanism for heating and cools the first heat pump mechanism at the same time, effective utilization of energy is achieved, and meanwhile the working efficiency of the first heat pump mechanism and the second heat pump mechanism is improved; the use of a cooling tower can be avoided, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy equipment, in particular to a dual-energy combined cooling and heating supply system. Background Art

[0002] Meat food factories, slaughter processing factories, dairy product processing factories, etc. are food production and processing enterprises that need to use cold storage for preservation and high-temperature hot water at the same time; generally, a refrigeration air conditioner and a high-temperature heat pump are equipped at the same time to meet the needs of production and processing. Although two devices, namely a refrigeration air conditioner and a high-temperature heat pump, are equipped at the same time, for some special production and processing processes, the existing refrigeration air conditioner cannot reach a sufficient cooling temperature, and at the same time, the hot water temperature provided by the high-temperature heat pump is not enough; moreover, since the refrigeration air conditioner needs to be equipped with a separate cooling tower to cool the condenser, it increases the floor area of the equipment and the production cost of the enterprise.

[0003] Therefore, the existing technology still needs to be improved and enhanced. Content of the Utility Model

[0004] In view of the deficiencies of the above-mentioned existing technology, the purpose of the utility model is to provide a dual-energy combined cooling and heating supply system to solve the problem that there is no equipment in the existing technology that has a small occupied area, low cost and can provide cooling and high-temperature hot water at the same time.

[0005] The technical solution of the utility model is as follows:

[0006] Provide a dual-energy combined cooling and heating supply system, including:

[0007] A first heat pump mechanism, a second heat pump mechanism, an intermediate heat exchanger and a water flow pipeline;

[0008] The first heat pump mechanism is connected to the client cold air blower outside to cool the client cold air blower;

[0009] The second heat pump mechanism is connected to the water flow pipeline to provide heat for the water flow pipeline;

[0010] The intermediate heat exchanger connects the first heat pump mechanism and the second heat pump mechanism to enable the first heat pump mechanism and the second heat pump mechanism to complete heat exchange.

[0011] In the above solution, the first heat pump mechanism is used for refrigeration, the second heat pump mechanism is used for heating, and the intermediate heat exchanger provides the excess heat generated by the first heat pump mechanism to the second heat pump mechanism through heat exchange. The second heat pump mechanism absorbs the heat of the first heat pump mechanism for heating, and at the same time plays a role in cooling the first heat pump mechanism, realizing the effective utilization of energy, improving the working efficiency of the first heat pump mechanism and the second heat pump mechanism at the same time, and can also avoid the use of a cooling tower, saving the floor area of the cooling tower equipment and the equipment cost, thereby reducing the production cost.

[0012] Further, the first heat pump mechanism includes: a first compressor, a first throttle valve, and a first refrigerant pipeline;

[0013] The first refrigerant pipeline is sequentially connected to the first compressor, the intermediate heat exchanger, the first throttle valve, and the client air cooler to form a first refrigerant circuit.

[0014] In the above solution, the intermediate heat exchanger acts as a condenser in the first heat pump mechanism. The high-temperature and high-pressure refrigerant vapor compressed by the first compressor is liquefied into a liquid refrigerant at the intermediate heat exchanger and releases heat to the second heat pump mechanism.

[0015] Further, the dual-energy combined cooling and heating supply system further includes: a gas mechanism;

[0016] The gas mechanism and the second heat pump mechanism are connected through the water pipeline. The cold water in the water pipeline sequentially absorbs the heat of the second heat pump mechanism and the gas mechanism and then is discharged.

[0017] In the above solution, the cold water entering the water pipeline first absorbs heat in the second heat pump mechanism and is heated to medium-temperature hot water. Then, it is heated by the gas mechanism, and the gas mechanism further raises the water temperature to 95 degrees Celsius of high temperature. Finally, the hot water is discharged through the outlet pipe.

[0018] Further, the dual-energy combined cooling and heating supply system further includes a heat exchange mechanism;

[0019] The gas mechanism further includes a flue gas pipe, and the flue gas pipe is connected to the heat exchange mechanism;

[0020] The heat exchange mechanism is also connected to the second heat pump mechanism to provide heat exchange for the second heat pump mechanism.

[0021] In the above solution, the flue gas pipe exchanges heat with the second heat pump through the heat exchange mechanism. The high-temperature flue gas of the flue gas mechanism releases flue gas heat to the second heat pump mechanism through the heat exchange mechanism, playing a role in recovering and utilizing the waste heat of the flue gas, and can further improve the working efficiency of the second heat pump mechanism.

[0022] Further, the second heat pump mechanism includes: a second compressor, a condenser, a second throttle valve, and a second refrigerant pipeline;

[0023] The second refrigerant pipeline is sequentially connected to the second compressor, the condenser, the second throttle valve, the intermediate heat exchanger, and the heat exchange mechanism to form a second refrigerant circuit.

[0024] In the above solution, the intermediate heat exchanger acts as an evaporator in the second heat pump mechanism. The second heat pump mechanism absorbs the heat of the first heat pump mechanism through the intermediate heat exchanger to raise the temperature of the refrigerant, and then absorbs heat again through the heat exchange unit to further increase the temperature of the refrigerant. The higher the temperature of the refrigerant, the less energy consumption required by the second compressor, and the higher the heating efficiency of the second compressor.

[0025] Furthermore, the water flow pipeline is sequentially connected to the condenser and the gas mechanism, and the cold water in the water flow pipeline absorbs the heat of the condenser and the gas mechanism in sequence and then is discharged.

[0026] In the above solution, the condenser first raises the cold water in the second water pipeline to medium-temperature hot water, and then uses the gas mechanism to further raise the water temperature to high-temperature hot water at 95 degrees to meet the user's water demand for high-temperature hot water.

[0027] Furthermore, the refrigerant circulation directions in the first heat pump mechanism and the second heat pump mechanism are opposite.

[0028] In the above solution, the direction of the refrigerant passing through the intermediate heat exchanger in the first heat pump mechanism is opposite to the direction of the refrigerant passing through the heat exchanger in the second heat pump mechanism, enabling the refrigerant vapor in the first heat pump mechanism and the liquid refrigerant in the second heat pump mechanism to conduct sufficient heat exchange in the intermediate heat exchanger.

[0029] Furthermore, the first compressor is a screw compressor.

[0030] Furthermore, the second compressor is a screw compressor.

[0031] In the above solution, the screw compressor has high reliability, is convenient for operation and maintenance, and is small in size, light in weight, and small in floor area, facilitating the operation of the combined heat and power system.

[0032] Furthermore, the dual-energy combined heat and power system further includes: a skid, which is used to install the first heat pump mechanism, the second heat pump mechanism, the intermediate heat exchanger, the heat exchange mechanism, the water flow pipeline, and the gas mechanism.

[0033] In the above solution, the skid facilitates the transportation and installation of the combined heat and power system, enabling it to be deployed and used more effectively.

[0034] Compared with the prior art, a dual - energy combined cooling and heating supply system proposed by this solution has a first heat pump mechanism for refrigeration and a second heat pump mechanism for heating. The intermediate heat exchanger provides the excess heat generated by the first heat pump mechanism to the second heat pump mechanism through heat exchange. The second heat pump mechanism absorbs the heat of the first heat pump mechanism for heating and at the same time cools the first heat pump mechanism, realizing the effective utilization of energy, improving the working efficiency of the first heat pump mechanism and the second heat pump mechanism, and avoiding the use of a cooling tower, saving the floor area and equipment cost of the cooling tower equipment, thereby reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of an embodiment of a dual - energy combined cooling and heating supply system of the present utility model Figure 1 ;

[0036] Figure 2 is a schematic structural diagram of an embodiment of a dual - energy combined cooling and heating supply system of the present utility model Figure 2 ;

[0037] Figure 3 is Figure 2 the working principle diagram of the dual - energy combined cooling and heating supply system shown;

[0038] Reference numerals in the figure: 1, the first heat pump mechanism; 11, the first compressor; 12, the first throttle valve; 13, the first refrigerant circuit; 2, the second heat pump mechanism; 21, the second compressor; 22, the condenser; 23, the second throttle valve; 24, the second refrigerant circuit; 3, the intermediate heat exchanger; 4, the heat exchange mechanism; 5, the gas mechanism; 51, the flue gas pipe; 6, the water flow pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The present utility model provides a dual - energy combined cooling and heating supply system. To make the purpose, technical solutions and effects of the present utility model clearer and more definite, the following further elaborates on the present utility model with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0040] Users with simultaneous requirements for cryogenic (- 18°C) and high - temperature hot water (95°C) need to be equipped with both a refrigeration air - conditioner and a heat pump for heating at the same time. Moreover, the refrigeration effect of the air - conditioner and the heating effect of the heat pump cannot meet the usage requirements. The refrigeration air - conditioner also needs to be equipped with a separate cooling tower for cooling, increasing the floor area of the equipment and the production cost of the enterprise.

[0041] To solve the above - mentioned technical problems, the present utility model provides a structure and technical solution of a dual - energy combined cooling and heating supply system, as specifically described in the following embodiments.

[0042] As Figure 1As shown in the figure, a dual - energy combined cooling and heating supply system mentioned in this solution specifically includes: a first heat pump mechanism 1, a second heat pump mechanism 2, an intermediate heat exchanger 3, and a water flow pipeline 6;

[0043] The first heat pump mechanism 1 is connected to a client's cold air blower outside to cool the client's cold air blower;

[0044] The second heat pump mechanism 2 is connected to the water flow pipeline 6 to provide heat for the water flow pipeline 6;

[0045] The intermediate heat exchanger 3 connects the first heat pump mechanism 1 and the second heat pump mechanism 2 to enable heat exchange between the first heat pump mechanism 1 and the second heat pump mechanism 2.

[0046] The first heat pump mechanism 1 is connected to a client's cold air blower outside to make the client's cold air blower release cold air to achieve a refrigeration effect. The second heat pump mechanism 2 is connected to the water flow pipeline 6 to release heat to the water flow pipeline 6, so that the water in the water flow pipeline 6 becomes hot water after absorbing heat. The first heat pump mechanism 1 is equivalent to a refrigeration air conditioner, and the second heat pump mechanism 2 is a heating heat pump. When the first heat pump mechanism 1 works, it will generate excess heat. When the second heat pump works, it needs a heat source to provide heat. The intermediate heat exchanger 3 is connected to both the first heat pump mechanism 1 and the second heat pump mechanism 2 at the same time, and provides the excess heat generated by the first heat pump mechanism 1 to the second heat pump mechanism 2, enabling heat exchange between the first heat pump mechanism 1 and the second heat pump mechanism 2. The second heat pump mechanism 2 absorbs the heat of the first heat pump mechanism 1, which plays a role in cooling the first heat pump mechanism 1 and improving the working efficiency of the first heat pump mechanism 1. At the same time, the first heat pump mechanism 1 absorbs the excess heat of the first heat pump mechanism 1 for heating, improving the heating efficiency of the second heat pump mechanism 2.

[0047] The first heat pump mechanism 1 is used for refrigeration, and the second heat pump mechanism 2 is used for heating. The intermediate heat exchanger 3 provides the excess heat generated by the first heat pump mechanism 1 to the second heat pump mechanism 2 through heat exchange. The second heat pump mechanism 2 absorbs the heat of the first heat pump mechanism 1 for heating, and at the same time plays a role in cooling the first heat pump mechanism 1, realizing the effective utilization of energy, improving the working efficiency of both the first heat pump mechanism 1 and the second heat pump mechanism 2, and also avoiding the use of a cooling tower, saving the floor area and equipment cost of the cooling tower equipment, thereby reducing production costs.

[0048] As Figure 2 shown, the dual - energy combined cooling and heating supply system further includes: a gas mechanism 5;

[0049] The gas mechanism 5 and the second heat pump mechanism 2 are connected through the water flow pipeline 6, and the cold water in the water flow pipeline 6 sequentially absorbs the heat of the second heat pump mechanism 2 and the gas mechanism 5 and then is discharged.

[0050] The cold water entering through the water flow pipeline 6 first absorbs heat in the second heat pump mechanism 2 and is raised to medium-temperature hot water. Then it is heated by the gas mechanism 5, and the gas mechanism 5 further raises the water temperature to 95°C high temperature. Finally, the hot water is discharged through the water outlet pipe.

[0051] Optionally, the fuel of the gas mechanism 5 includes but is not limited to natural gas, liquefied gas, biogas, etc.

[0052] The dual-energy cold and heat combined supply system further includes a heat exchange mechanism 4;

[0053] The gas mechanism 5 further includes a flue gas pipe 51, and the flue gas pipe 51 is connected to the heat exchange mechanism 4;

[0054] The heat exchange mechanism 4 is also connected to the second heat pump mechanism 2 to provide heat exchange for the second heat pump mechanism 2.

[0055] As Figure 3 shown, the gas mechanism 5 burns to generate high-temperature flue gas. The high-temperature flue gas is discharged from the flue gas pipe 51 after heat exchange by the heat exchange mechanism 4. The flue gas pipe 51 exchanges heat with the second heat pump through the heat exchange mechanism 4. The high-temperature flue gas of the flue gas mechanism releases flue gas heat to the second heat pump mechanism 2 through the heat exchange mechanism 4, playing a role in recycling the waste heat of the flue gas. The temperature of the flue gas just discharged from the gas mechanism 5 is as high as 150°C. After heat exchange with the second heat pump mechanism 2 through the heat exchange mechanism 4, the flue gas temperature can be reduced to 10°C, that is, the heat exchange efficiency of the heat exchange mechanism 4 is high, and the heat of the flue gas is fully absorbed by the second heat pump mechanism 2. The second heat pump mechanism 2 improves the working efficiency of the second heat pump mechanism by absorbing the temperature of the high-temperature flue gas.

[0056] As Figure 3 shown, the first heat pump mechanism 1 includes: a first compressor 11, a first throttle valve 12 and a first refrigerant pipeline; the first refrigerant pipeline is sequentially connected to the first compressor 11, an intermediate heat exchanger 3, the first throttle valve 12 and a client air cooler to form a first refrigerant circuit 13.

[0057] The first heat pump mechanism 1 is equivalent to a refrigeration air conditioner. In the first refrigerant circuit 13, the client-side air cooler acts as an evaporator. It uses the evaporation of the refrigerant to absorb heat and reduce the temperature. The evaporated refrigerant is compressed at the first compressor 11, increasing the temperature and pressure of the refrigerant. Then it enters the intermediate heat exchanger 3 to be liquefied. After that, the liquid refrigerant passes through the first throttle valve 12 to reduce the pressure and then enters the client-side air cooler again to start the next cycle. The role of the intermediate heat exchanger 3 in the first heat pump mechanism 1 is equivalent to that of the condenser 22. The high-temperature and high-pressure refrigerant vapor compressed by the first compressor 11 is liquefied into liquid refrigerant at the intermediate heat exchanger 3 and releases heat to the second heat pump mechanism 2. When the evaporation temperature of the client-side air cooler and the rotation speed of the first compressor 11 are constant, the lower the condensation temperature, the greater the coefficient of performance of the first heat pump mechanism 1, the smaller the power consumption, the reduction of the compression work of the first compressor 11, the increase of the refrigerating capacity, and the improvement of the refrigeration effect. While improving the refrigeration effect of the first heat pump mechanism 1 through the intermediate heat exchanger 3, it can also provide a heat source for the second heat pump mechanism 2 to heat, improve the heating efficiency of the second heat pump, and save the equipment floor area and equipment usage cost of the cooling tower.

[0058] The client-side air cooler is usually installed in a cold storage. The temperature in the cold storage is generally -18°C - 25°C. The refrigerant temperature is lower than the cold storage temperature. The refrigerant flowing through the client-side air cooler evaporates by absorbing the air temperature in the cold storage, thereby reducing the cold storage temperature and keeping the cold storage in a low-temperature environment.

[0059] The second heat pump mechanism 2 includes: a second compressor 21, a condenser 22, a second throttle valve 23, and a second refrigerant pipeline;

[0060] The second refrigerant pipeline is sequentially connected to the second compressor 21, the condenser 22, the second throttle valve 23, the intermediate heat exchanger 3, and the heat exchange mechanism 4 to form a second refrigerant circuit 24.

[0061] The second heat pump mechanism 2 mainly generates heat by absorbing heat. In the second refrigerant circuit 24, the refrigerant absorbs the heat released by the first heat pump mechanism 1 through the intermediate heat exchanger 3 to evaporate the refrigerant. The evaporated refrigerant then passes through the heat exchange mechanism 4 to further absorb the heat of the flue gas in the flue gas pipe 51, further increasing the temperature of the refrigerant vapor. Then, it is compressed at the second compressor 21 to increase the temperature and pressure of the refrigerant. Subsequently, it enters the condenser 22 to be liquefied. When the refrigerant is liquefied, the released heat is absorbed by the cold water in the water flow pipeline 6. The liquefied refrigerant is throttled and depressurized by the second throttle valve 23 and then enters the intermediate heat exchanger 3 again for the next cycle. The intermediate heat exchanger 3 acts as an evaporator in the second heat pump mechanism 2. The second heat pump mechanism 2 absorbs the heat of the first heat pump mechanism 1 through the intermediate heat exchanger 3 to increase the temperature of the refrigerant, and then absorbs heat again through the heat exchange mechanism 4 to further increase the temperature of the refrigerant. The higher the temperature of the refrigerant, the lower the compression ratio of the second compressor 21, and the less energy consumption required by the second compressor 21, and the higher the heating efficiency of the second compressor 21.

[0062] It should be noted that the circulation directions of the first refrigerant circuit 13 and the first refrigerant circuit 13 are opposite. The direction of the refrigerant passing through the intermediate heat exchanger 3 in the first heat pump mechanism 1 is opposite to the direction of the refrigerant passing through the heat exchanger in the second heat pump mechanism 2, so that the refrigerant vapor in the first heat pump mechanism 1 and the liquid refrigerant in the second heat pump mechanism 2 can perform sufficient heat exchange in the intermediate heat exchanger 3.

[0063] The water flow pipeline 6 is sequentially connected to the condenser 22 and the gas mechanism 5. The cold water in the water flow pipeline 6 absorbs the heat of the condenser 22 and the gas mechanism 5 in sequence and then is discharged.

[0064] Specifically, the water inlet of the condenser 22 is connected to the water inlet pipe of the water flow pipeline 6 to introduce water. The water outlet of the condenser 22 is connected to the water inlet of the gas mechanism 5. The water outlet of the gas mechanism 5 is connected to the water outlet pipe of the water flow pipeline 6 to discharge the hot water. The condenser 22 first raises the cold water in the second water pipeline to medium-temperature hot water, and then uses the gas mechanism 5 to further raise the water temperature to 95-degree high-temperature hot water to meet the user's demand for high-temperature hot water.

[0065] The first compressor 11 and the second compressor 21 are connected to an external power supply, and the external power supply includes but is not limited to commercial power.

[0066] The first compressor 11 is a screw compressor. The second compressor 21 is a screw compressor.

[0067] The screw compressor has high reliability, is convenient for operation and maintenance, and has a small volume, light weight, and small floor area, which is convenient for the operation of the combined supply system.

[0068] The dual-energy combined cooling and heating supply system further includes: a skid, which is used to install the first heat pump mechanism 1, the second heat pump mechanism 2, the intermediate heat exchanger 3, the heat exchange mechanism 4, the water flow pipeline 6 and the gas mechanism 5, so as to facilitate the transportation and installation of the combined supply system, enabling it to be deployed and used more effectively.

[0069] In summary, the present technical solution proposes a dual-energy combined cooling and heating supply system. The first heat pump mechanism 1 is equivalent to a refrigeration air conditioner. The second heat pump mechanism 2 mainly generates heat by absorbing heat. The role of the intermediate heat exchanger 3 in the first heat pump mechanism 1 is equivalent to that of the condenser 22. The high-temperature and high-pressure refrigerant vapor compressed by the first compressor 11 liquefies into a liquid refrigerant at the intermediate heat exchanger 3 and releases heat to the second heat pump mechanism 2. When the evaporation temperature of the cold air blower at the client side and the rotation speed of the first compressor 11 are constant, the lower the condensation temperature, the greater the refrigeration coefficient of the first heat pump mechanism 1, the smaller the power consumption, the compression work of the first compressor 11 decreases, the refrigeration capacity increases, and the refrigeration effect improves. While improving the refrigeration effect of the first heat pump mechanism 1 through the intermediate heat exchanger 3, it can also provide a heat source for the second heat pump mechanism 2 to generate heat, improve the heating efficiency of the second heat pump, and save the equipment floor area and equipment usage cost of the cooling tower.

[0070] It should be understood that the application of the present utility model is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations shall fall within the protection scope of the appended claims of the present utility model.

Claims

1. A dual-energy combined cooling and heating supply system, characterized in that, Comprising: A first heat pump mechanism, a second heat pump mechanism, an intermediate heat exchanger, a water flow pipeline, and a gas mechanism; The first heat pump mechanism is connected to a client air cooler outside to cool the client air cooler; The second heat pump mechanism is connected to the water flow pipeline to provide heat for the water flow pipeline; The intermediate heat exchanger connects the first heat pump mechanism and the second heat pump mechanism to enable heat exchange between the first heat pump mechanism and the second heat pump mechanism; The gas mechanism and the second heat pump mechanism are connected through the water flow pipeline, and the cold water in the water flow pipeline discharges after successively absorbing the heat of the second heat pump mechanism and the gas mechanism.

2. The dual-energy combined cooling and heating supply system according to claim 1, wherein The first heat pump mechanism includes: a first compressor, a first throttle valve, and a first refrigerant pipeline; The first refrigerant pipeline successively connects the first compressor, the intermediate heat exchanger, the first throttle valve, and the client air cooler to form a first refrigerant circuit.

3. The dual-energy combined cooling and heating supply system according to claim 1, wherein, The dual-energy combined cooling and heating supply system further includes a heat exchange mechanism; The gas mechanism further includes a flue gas pipe, and the flue gas pipe is connected to the heat exchange mechanism; The heat exchange mechanism is further connected to the second heat pump mechanism to provide heat exchange for the second heat pump mechanism.

4. The dual-energy combined cooling and heating supply system according to claim 3, wherein, The second heat pump mechanism includes: a second compressor, a condenser, a second throttle valve, and a second refrigerant pipeline; The second refrigerant pipeline successively connects the second compressor, the condenser, the second throttle valve, the intermediate heat exchanger, and the heat exchange mechanism to form a second refrigerant circuit.

5. A dual-energy combined cooling and heating supply system according to claim 4, characterized in that, The water flow pipeline successively connects the condenser and the gas mechanism, and the cold water in the water flow pipeline discharges after successively absorbing the heat of the condenser and the gas mechanism.

6. The dual-energy combined cooling and heating supply system according to claim 1, characterized in that, The refrigerant circulation directions in the first heat pump mechanism and the second heat pump mechanism are opposite.

7. The dual-energy combined cooling and heating supply system according to claim 2, wherein The first compressor is a screw compressor.

8. A dual-energy combined cooling and heating supply system according to claim 4, wherein, The second compressor is a screw compressor.

9. A dual-energy combined cooling and heating supply system according to claim 3, characterized in that, The dual-energy combined cooling and heating supply system further includes: a skid frame, which is used to install the first heat pump mechanism, the second heat pump mechanism, the intermediate heat exchanger, the heat exchange mechanism, the water flow pipeline, and the gas mechanism.

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