CN-122010212-A - Low temperature heat pump evaporation equipment

Abstract

The application discloses low-temperature heat pump evaporation equipment which comprises an evaporation system, a heat pump system, a vacuum system and a working condition adjusting system. Through respectively at condensing heat exchanger export, evaporating heat exchanger export, first compressor export, set up adjustable circulating water's heat exchanger nearby, introduced first governing valve, second governing valve, third governing valve and adjusted circulating water and refrigerant's heat transfer volume, permitted circulating water absorbs or releases the heat when flowing through different heat exchangers to adjust the refrigerant state, and then let heat pump system's operating mode fluctuation influence can be solved in the first time, avoid fluctuation chain influence that brings. This helps to stabilize the operating mode of the heat pump system, effectively suppressing the operating mode fluctuations of the evaporation system.

Inventors

• CHEN YUE
• YU HUATAO
• OU YUPING

Assignees

• 深圳市蓝石环保科技有限公司

Dates

Publication Date

20260512

Application Date

20260125

Claims (10)

1. 1. A low-temperature heat pump evaporation device is characterized by comprising an evaporation system, a heat pump system, a vacuum system and a working condition adjusting system, wherein, The evaporation system comprises an evaporator, an evaporation heat exchanger and a condensation heat exchanger, wherein the evaporation heat exchanger is used for providing heat required by evaporation for liquid in the evaporator, and the condensation heat exchanger is used for providing a condensation environment for gas evaporated in the evaporator; The heat pump system comprises a first compressor, a first heat exchanger, a second heat exchanger, a first expansion valve and a refrigerant heat exchange device, wherein an outlet of the first compressor is communicated with an inlet of the first compressor in sequence through the first heat exchanger, the evaporation heat exchanger, the second heat exchanger, the first expansion valve, the condensation heat exchanger and the refrigerant heat exchange device to form a heat pump loop; the vacuum system is used for providing a vacuum environment for the evaporation system; The working condition adjusting system comprises a circulating water tank, a first circulating water pump, a first adjusting valve, a second adjusting valve and a third adjusting valve, wherein the lower part of the circulating water tank is communicated with the inlet of the first circulating water pump, the outlet of the first circulating water pump is communicated with the inlet of the first adjusting valve, the first outlet of the first adjusting valve is communicated with the inlet of the second adjusting valve through the refrigerant heat exchange device and is used for carrying out heat exchange with refrigerant flowing through the refrigerant heat exchange device, the second outlet of the first adjusting valve is communicated with the inlet of the second adjusting valve, the first outlet of the second adjusting valve is communicated with the inlet of the third adjusting valve through the second heat exchanger, the second outlet of the second adjusting valve is communicated with the inlet of the third adjusting valve, the first outlet of the third adjusting valve is communicated with the inlet of the circulating water tank through the first heat exchanger, and the second outlet of the third adjusting valve is communicated with the first inlet of the circulating water tank, and a working condition adjusting loop is formed.
2. 2. The low temperature heat pump evaporation apparatus according to claim 1, further comprising a control module; The control module is used for adjusting the opening degree of the first outlet of the first regulating valve according to the third temperature value detected by the third temperature sensor and the third pressure value detected by the third pressure sensor in the heating and/or evaporating stage, The control module is used for adjusting the opening degree of the first outlet of the second regulating valve according to a second temperature value detected by the second temperature sensor and a second pressure value detected by the second pressure sensor in a heating and/or evaporating stage, The control module is used for adjusting the opening degree of the first outlet of the third regulating valve according to the first temperature value detected by the first temperature sensor and the first pressure value detected by the first pressure sensor in the heating and/or evaporating stage, The control module is also used for controlling the first outlet of the first regulating valve, the first outlet of the second regulating valve and the first outlet of the third regulating valve to be in a closed state in the liquid inlet stage.
3. 3. The low temperature heat pump evaporation apparatus according to any one of claims 1 to 2, wherein said vacuum system comprises an ejector, a first inlet of said ejector being in communication with an outlet of said first circulating water pump, an outlet of said ejector being in communication with an inlet of said first regulating valve, a second inlet of said ejector being in communication with said evaporator, or The vacuum system comprises an ejector and a second circulating water pump, wherein the lower part of the circulating water tank is communicated with an inlet of the second circulating water pump, an outlet of the second circulating water pump is communicated with a first inlet of the ejector, an outlet of the ejector is communicated with a second inlet of the circulating water tank, and a second inlet of the ejector is communicated with the evaporator.
4. 4. A low temperature heat pump evaporation apparatus according to any of claims 1 to 3, further comprising a water temperature adjustment system for: Refrigerating the water in the circulating water tank in the liquid inlet stage, preheating the sewage to be treated in the sewage tank communicated with the inlet of the evaporator, and/or, Heating the water in the circulation tank during a heating phase, and/or, The water in the circulation tank is cooled or heated during the evaporation stage.
5. 5. The low temperature heat pump evaporation apparatus according to claim 4, wherein said water temperature adjustment system comprises a main four-way valve, a second compressor, a circulating water heat exchanger, an air heat exchanger, a sewage heat exchanger, a second expansion valve, a sub four-way valve; The first port of the main four-way valve is connected with the outlet of the second compressor, the second port of the main four-way valve is connected with the first port of the circulating water heat exchanger, the third port of the main four-way valve is connected with the inlet of the second compressor, the fourth port of the main four-way valve is connected with the first port of the sewage heat exchanger, the second port of the circulating water heat exchanger is connected with the first port of the auxiliary four-way valve through the second expansion valve, the second port of the auxiliary four-way valve is connected with the fourth port of the auxiliary four-way valve through the air heat exchanger, and the third port of the auxiliary four-way valve is connected with the second port of the sewage heat exchanger.
6. 6. The low temperature heat pump evaporation apparatus according to claim 5, wherein, The control module is used for controlling the water temperature regulating system to enter a refrigerating mode and comprises controlling the second compressor to be in a starting state, controlling the first interface of the main four-way valve to be communicated with the fourth interface, and controlling the second interface of the auxiliary four-way valve to be communicated with the third interface; Or alternatively, the first and second heat exchangers may be, The control module is used for controlling the water temperature regulating system to enter a heating mode and comprises controlling the second compressor to be in a starting state, controlling the first interface of the main four-way valve to be communicated with the second interface and the third interface to be communicated with the fourth interface, and controlling the first interface of the auxiliary four-way valve to be communicated with the second interface and the third interface to be communicated with the fourth interface.
7. 7. The low temperature heat pump evaporation apparatus according to claim 6, wherein a fourth temperature sensor and a fourth pressure sensor are provided at an outlet of said air heat exchanger; the control module is used for determining the liquefaction degree and supercooling degree of the refrigerant at the outlet of the air heat exchanger according to the fourth temperature value detected by the fourth temperature sensor and the fourth pressure value detected by the fourth pressure sensor under the condition that the water temperature regulating system is in a refrigerating mode, and controlling the on-off of a fan of the air heat exchanger; and under the condition that the water temperature regulating system is in a heating mode, determining the gasification degree of the refrigerant according to the fourth temperature value and the fourth pressure value, and controlling the on-off of a fan of the air heat exchanger.
8. 8. The low temperature heat pump evaporation apparatus according to claim 4, wherein said water temperature adjustment system comprises a main four-way valve, a second compressor, a circulating water heat exchanger, an air heat exchanger, a sewage heat exchanger, and a second expansion valve; The first port of the main four-way valve is connected with the outlet of the second compressor, the second port of the main four-way valve is connected with the first interface of the circulating water heat exchanger, the third port of the main four-way valve is connected with the inlet of the second compressor, the fourth port of the main four-way valve is connected with the first interface of the sewage heat exchanger, and the second interface of the circulating water heat exchanger sequentially passes through the second expansion valve, the air heat exchanger and the second interface of the sewage heat exchanger.
9. 9. The low temperature heat pump evaporation apparatus according to claim 8, wherein, A fourth temperature sensor and a fourth pressure sensor are arranged between the air heat exchanger and the second expansion valve, and a sixth temperature sensor and a sixth pressure sensor are arranged between the air heat exchanger and the sewage heat exchanger; the control module is used for determining the liquefaction degree and supercooling degree of the refrigerant at the outlet of the air heat exchanger according to the fourth temperature value detected by the fourth temperature sensor and the fourth pressure value detected by the fourth pressure sensor under the condition that the water temperature regulating system is in a refrigerating mode, and controlling the on-off of a fan of the air heat exchanger; And under the condition that the water temperature regulating system is in a heating mode, determining the gasification degree of the refrigerant at the outlet of the air heat exchanger according to a sixth temperature value detected by the sixth temperature sensor and a sixth pressure value detected by the sixth pressure sensor, and controlling the on-off of a fan of the air heat exchanger.
10. 10. The low temperature heat pump evaporation apparatus according to any one of claims 1 to 9, wherein said condensing heat exchanger is a double pipe heat exchanger to replace said refrigerant heat exchanging device, The first outlet of the first regulating valve is communicated with the inlet of the second regulating valve through an inner pipe of the condensing heat exchanger; the first expansion valve is communicated with the inlet of the first compressor through an outer tube of the condensing heat exchanger.

Description

Low temperature heat pump evaporation equipment Technical Field The application relates to the technical field of low-temperature heat pump evaporation equipment and control, in particular to a heat pump low-temperature evaporation system suitable for industrial sewage treatment. Background The low temperature heat pump evaporator is one kind of industrial sewage treating equipment. The sewage treatment device combines a low-temperature evaporation technology and a heat pump technology, heats sewage by generating heat at a heating end of the heat pump system, heats and evaporates the sewage by utilizing the characteristic that water can be boiled at a low temperature in a high negative pressure (vacuum) environment, and condenses water vapor by cooling through a cooling end of the heat pump system, so that water is separated from the sewage, and high-efficiency treatment of the sewage is realized. The heat energy of the low temperature heat pump evaporator is provided by the heat pump system. The heat pump system generally comprises a compressor, and forms a heat pump loop together with an evaporation heat exchanger, an expansion valve, a condensation heat exchanger and the like. The compressor sucks in a low-temperature refrigerant, compresses the refrigerant, and discharges a high-temperature high-pressure gaseous refrigerant. Then, the high-temperature and high-pressure gaseous refrigerant enters an evaporation heat exchanger in the evaporator, and heat exchange is carried out through the evaporation heat exchanger, so that sewage in the evaporator is heated. The refrigerant turns into liquid refrigerant after releasing heat, leaves the evaporating heat exchanger, passes through the expansion valve and enters the condensing heat exchanger above the evaporator. The sewage is heated and evaporated, and the water vapor in the evaporator moves upwards to the area where the condensing heat exchanger is located, exchanges heat with the refrigerant in the condensing heat exchanger, condenses into water and is discharged from the evaporator. The refrigerant absorbs heat and gasifies and returns to the inlet of the compressor. Under the design working condition (ideal state), the heat pump system works under the ideal suction and exhaust conditions and the ideal condensing and evaporating conditions of the refrigerant, and can keep better heating efficiency. However, in practical application, the heat pump system is difficult to continuously operate in an ideal state due to fluctuation of working conditions. Disclosure of Invention The application aims to provide low-temperature heat pump evaporation equipment, which is introduced into a working condition adjusting system, and can adjust the state of a refrigerant by controlling the heat exchange quantity of circulating water in a working condition adjusting loop and the refrigerant in a heat pump system, so that the working condition of the heat pump system is adjusted and stabilized, the working condition fluctuation of the evaporation system is effectively restrained, the system stability is improved, and the whole operation energy consumption of the system is reduced. In a first aspect, the application provides low temperature heat pump evaporation equipment, comprising an evaporation system, a heat pump system, a vacuum system and a water temperature adjusting system, wherein, The evaporation system comprises an evaporator, an evaporation heat exchanger and a condensation heat exchanger, wherein the evaporation heat exchanger is used for providing heat required by evaporation for liquid in the evaporator, and the condensation heat exchanger is used for providing a condensation environment for gas evaporated in the evaporator; The heat pump system comprises a first compressor, a first heat exchanger, a second heat exchanger, a first expansion valve and a refrigerant heat exchange device, wherein an outlet of the first compressor is communicated with an inlet of the first compressor in sequence through the first heat exchanger, the evaporation heat exchanger, the second heat exchanger, the first expansion valve, the condensation heat exchanger and the refrigerant heat exchange device to form a heat pump loop; the vacuum system is used for providing a vacuum environment for the evaporation system; The working condition adjusting system comprises a circulating water tank, a first circulating water pump, a first adjusting valve, a second adjusting valve and a third adjusting valve, wherein the lower part of the circulating water tank is communicated with the inlet of the first circulating water pump, the outlet of the first circulating water pump is communicated with the inlet of the first adjusting valve, the first outlet of the first adjusting valve is communicated with the inlet of the second adjusting valve through the refrigerant heat exchange device and is used for carrying out heat exchange with refrigerant flowing through the refrigerant heat exchange dev