CN-224207438-U - Parallel distillation kettle type low-temperature heat pump crystallization system

Abstract

The application relates to a parallel distillation kettle type low-temperature heat pump crystallization system which comprises a heat pump system, a proportional control valve, a distillation kettle a, a distillation kettle b and a control system, wherein the heat pump system is used for providing power and temperature regulation for refrigerant circulation, the distillation kettle a and the distillation kettle b are both provided with a temperature sensor and a pressure sensor and used for monitoring the temperature and the pressure of materials in the kettles in real time and feeding data back to the control system so as to realize accurate control, the proportional control valve is connected with the heat pump system and the distillation kettle a and the distillation kettle b and used for controlling the amount of the refrigerant entering the distillation kettle a and the distillation kettle b.

Inventors

• ZHAO TIANYI
• LIU WEI

Assignees

• 昆山威胜达环保设备有限公司

Dates

Publication Date

20260508

Application Date

20250516

Claims (6)

1. 1. The parallel distillation kettle type low-temperature heat pump crystallization system is characterized by comprising a heat pump system (1), a proportional regulating valve (2), a distillation kettle a (3), a distillation kettle b (4) and a control system; The heat pump system (1) comprises a compressor, a condenser, an expansion valve and an evaporator, and is used for providing power and temperature regulation of refrigerant circulation; The distillation still a (3) and the distillation still b (4) are respectively provided with a temperature sensor and a pressure sensor, and are used for monitoring the temperature and the pressure of materials in the distillation still in real time and feeding data back to a control system so as to realize accurate control; The proportional control valve (2) is connected with the heat pump system (1), the distillation still a (3) and the distillation still b (4) and is used for controlling the amount of refrigerant entering the distillation still a (3) and the distillation still b (4) so as to realize the alternate evaporation and preheating process.
2. 2. The parallel still low-temperature heat pump crystallization system according to claim 1, wherein the heat pump system (1) is operated, the proportional control valve (2) controls a large amount of refrigerant to enter the distillation still a (3) for evaporation, and simultaneously controls a small amount of refrigerant to enter the distillation still b (4) for preheating materials in the distillation still.
3. 3. The parallel still type low temperature heat pump crystallization system according to claim 2, wherein when the secondary steam amount in the still a (3) is reduced and the balance of the heat pump system (1) is influenced, the proportional regulating valve (2) controls a large amount of refrigerant to enter the still b (4) for evaporation, and simultaneously controls a small amount of refrigerant to enter the still a (3) for further reducing the water content of materials in the still.
4. 4. A parallel still type low temperature heat pump crystallization system according to claim 3, wherein when the water content of the material in the still a (3) reaches the standard, the material enters a deslagging process, then liquid is fed again, and the process is repeated, so that the still a (3) and the still b (4) are circularly fed into an evaporation process.
5. 5. The parallel still low temperature heat pump crystallization system according to claim 1, wherein the control system is used for receiving feedback data of the temperature sensor and the pressure sensor, controlling the opening of the proportional control valve (2) according to a preset program to realize automatic operation of the system, wherein the proportional control valve (2) is an electric proportional control valve, and the opening of the proportional control valve can be automatically adjusted by the control system according to real-time monitoring data to realize accurate control of the refrigerant quantity.
6. 6. The parallel still low temperature heat pump crystallization system according to claim 1, further comprising a slag discharging device for discharging and performing subsequent treatment after the water content of the material in the still a (3) or the still b (4) reaches the standard.

Description

Parallel distillation kettle type low-temperature heat pump crystallization system Technical Field The application relates to the technical field of low-temperature heat pump crystallization, in particular to a parallel distillation kettle type low-temperature heat pump crystallization system. Background The existing low-temperature heat pump crystallization system mostly adopts a single kettle structure (such as CN 217187949U), and has the defects that the heat exchange efficiency of a refrigerant is reduced due to the fact that the concentration of materials is increased in the later evaporation period, the secondary steam quantity is reduced, the compressor is frequently unloaded due to high pressure, the system starts and stops to vibrate, the energy consumption is wasted, the single kettle cannot continuously provide an efficient evaporation source, extra water cooling/air cooling balance heat is needed, the operation cost is increased, the slag water content is high, the water content of materials during unloading is more than 10%, secondary treatment is needed, and the energy utilization rate is low. In practical application, the forced circulation multi-effect evaporator is used in the prior art, and the problems of multi-kettle cooperative control and heat pump dynamic balance are not solved although the energy efficiency is improved. Accordingly, one skilled in the art provides a parallel still type low temperature heat pump crystallization system to solve the above-mentioned problems. Disclosure of utility model In order to solve the problems in the background technology, the application provides a parallel distillation kettle type low-temperature heat pump crystallization system. The application provides a parallel distillation kettle type low-temperature heat pump crystallization system, which adopts the following technical scheme: A parallel distillation kettle type low-temperature heat pump crystallization system comprises a heat pump system, a proportional control valve, a distillation kettle a, a distillation kettle b and a control system; The heat pump system comprises a compressor, a condenser, an expansion valve and an evaporator, and is used for providing power and temperature regulation of refrigerant circulation; The distillation kettle a and the distillation kettle b are respectively provided with a temperature sensor and a pressure sensor, and are used for monitoring the temperature and the pressure of materials in the kettles in real time and feeding data back to a control system so as to realize accurate control; The proportional control valve is connected with the heat pump system and the distillation kettles a and b and is used for controlling the amount of the refrigerant entering the distillation kettles a and b so as to realize the alternate evaporation and preheating process. Further, when the heat pump system is operated, the proportional control valve controls a large amount of refrigerant to enter the distillation still a for evaporation, and simultaneously controls a small amount of refrigerant to enter the distillation still b for preheating materials in the distillation still. Further, when the secondary steam amount in the distillation still a is reduced and the balance of the heat pump system is influenced, the proportional regulating valve controls a large amount of refrigerant to enter the distillation still b for evaporation, and simultaneously controls a small amount of refrigerant to enter the distillation still a so as to further reduce the water content of materials in the distillation still. Further, when the water content of the materials in the distillation still a reaches the standard, the materials enter a deslagging process, then liquid is fed again, and the process is repeated, so that the distillation still a and the distillation still b circularly enter an evaporation process. Further, the control system is used for receiving feedback data of the temperature sensor and the pressure sensor, controlling the opening of the proportional regulating valve according to a preset program so as to realize automatic operation of the system, wherein the proportional regulating valve is an electric proportional regulating valve, and the opening of the proportional regulating valve can be automatically regulated by the control system according to real-time monitoring data so as to realize accurate control of the refrigerant quantity. Further, the device also comprises a slag discharging device which is used for discharging the materials and carrying out subsequent treatment after the water content of the materials in the distillation still a or the distillation still b reaches the standard. In summary, the application has the following beneficial technical effects: 1. The application can avoid the situation that the water content of the obtained materials does not reach the standard due to the fact that the balance of the system is affected by the reduction of the