Parallel distillation still type low-temperature heat pump crystallization system

Abstract

The utility model relates to a parallel distillation still type low-temperature heat pump crystallization system which comprises a heat pump system, a proportioning valve, a distillation still a, a distillation still b and a control system, the heat pump system is used for providing power and temperature adjustment for refrigerant circulation; the distillation kettle a and the distillation kettle b are respectively provided with a temperature sensor and a pressure sensor which 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; and the proportioning valve is connected with the heat pump system, the distillation kettle a and the distillation kettle b and is used for controlling the quantity of refrigerants entering the distillation kettle a and the distillation kettle b. According to the application, the refrigerant flow is controlled through the proportioning valve, so that one of the parallel distillation kettles is always in a state of generating a large amount of secondary steam; and one part of the refrigerant is used for baking other distillation kettles in which materials in the kettles are in the later evaporation stage, so that the accurate control of the refrigerant amount can be realized, the water content of discharged slag is reduced, and the stability and consistency of the crystallization process are ensured.

Description

Technical Field

[0001] This application relates to the technical field of low-temperature heat pump crystallization, and in particular to a parallel distillation kettle type low-temperature heat pump crystallization system. Background Technology

[0002] Existing low-temperature heat pump crystallization systems mostly adopt a single-reactor structure (such as CN217187949U), which has the following defects: Imbalance in the later stage of evaporation: The increase in material concentration leads to a decrease in the heat exchange efficiency of the refrigerant, a reduction in the amount of secondary steam, and frequent unloading of the compressor due to high pressure, causing system start-up and shutdown oscillations; Wasteful energy consumption: A single reactor cannot continuously provide a high-efficiency evaporation source, requiring additional water / air cooling to balance the heat, increasing operating costs; High moisture content in the slag: The moisture content of the material at the time of unloading is >10%, requiring secondary treatment and resulting in low energy utilization.

[0003] In practical applications, existing improved technologies use forced circulation multi-effect evaporators, which improve energy efficiency, but do not solve the problems of multi-reactor collaborative control and dynamic balance of heat pumps.

[0004] Therefore, those skilled in the art have provided a parallel distillation kettle-type low-temperature heat pump crystallization system to solve the problems mentioned in the background art. Utility Model Content

[0005] To address the problems mentioned in the background art, this application provides a parallel distillation kettle type low-temperature heat pump crystallization system.

[0006] The parallel distillation kettle-type low-temperature heat pump crystallization system provided in this application adopts the following technical solution:

[0007] A parallel distillation kettle type low-temperature heat pump crystallization system includes a heat pump system, a proportional control valve, a distillation kettle a, a distillation kettle b, and a control system;

[0008] A heat pump system includes a compressor, condenser, expansion valve, and evaporator, which provide power and temperature regulation for the refrigerant circulation;

[0009] Both distillation vessel a and distillation vessel b are equipped with temperature sensors and pressure sensors to monitor the temperature and pressure of the material inside the vessel in real time and feed the data back to the control system to achieve precise control.

[0010] The proportional control valve is connected to the heat pump system and distillation kettles a and b to control the amount of refrigerant entering distillation kettles a and b, so as to realize the alternating evaporation and preheating process.

[0011] Furthermore, during the operation of the heat pump system, the proportional control valve controls a large amount of refrigerant to enter distillation vessel a for the evaporation process, while simultaneously controlling a small amount of refrigerant to enter distillation vessel b to preheat the material inside the vessel.

[0012] Furthermore, when the amount of secondary steam in distillation vessel a decreases and begins to affect the balance of the heat pump system, the proportional control valve controls a large amount of refrigerant to enter distillation vessel b for the evaporation process, while controlling a small amount of refrigerant to enter distillation vessel a, in order to further reduce the moisture content of the material in the vessel.

[0013] Furthermore, once the moisture content of the material in distillation vessel a reaches the standard, it enters the slag discharge process, and then liquid is added again, repeating the above process so that distillation vessel a and distillation vessel b circulate into the evaporation process.

[0014] Furthermore, the control system receives feedback data from temperature and pressure sensors and controls the opening of the proportional control valve according to a preset program to achieve automated operation of the system. The proportional control valve is an electric proportional control valve, and its opening can be automatically adjusted by the control system based on real-time monitoring data to achieve precise control of the refrigerant quantity.

[0015] Furthermore, it also includes a slag discharge device, used to discharge the material and carry out subsequent processing after the moisture content of the material in distillation vessel a or distillation vessel b reaches the standard.

[0016] In summary, this application includes the following beneficial technical effects:

[0017] 1. This application, by connecting two distillation kettles in parallel, can avoid the situation where the reduced amount of secondary steam in the kettles affects the system balance during the later stages of evaporation, causing the compressor to unload prematurely and resulting in the output moisture content not meeting the standard. Furthermore, by controlling the refrigerant flow rate through a proportional regulating valve, one of the parallel distillation kettles is always in a state of generating a large amount of secondary steam, and a portion of the refrigerant is used to bake the material in the other kettles that are in the later stages of evaporation. This enables precise control of the refrigerant amount, reduces the moisture content of the slag, and ensures the stability and consistency of the crystallization process.

[0018] 2. This application, through the cooperation of a control system and pressure and temperature sensors, can automatically adjust the opening of the proportional regulating valve based on real-time monitoring data to achieve precise control of the refrigerant quantity, reduce manual intervention, and automate operation, thereby improving production efficiency. Attached Figure Description

[0019] Figure 1 This is a connection diagram of this application;

[0020] Figure 2 This is a connection diagram of the control system in this application.

[0021] Explanation of reference numerals in the attached diagram: 1. Heat pump system; 2. Proportional control valve; 3. Distillation vessel a; 4. Distillation vessel b. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] Example 1

[0024] Reference Figure 1 , Figure 2 As shown, this application discloses a parallel distillation kettle type low-temperature heat pump crystallization system, including a heat pump system 1, a proportional regulating valve 2, a distillation kettle a3, and a distillation kettle b4. The proportional regulating valve 2 is connected to the heat pump system 1 and the distillation kettles a3 and b4 to control the amount of refrigerant entering the distillation kettles a3 and b4 to achieve alternating evaporation and preheating processes. It also includes a control system. Both distillation kettles a3 and b4 are equipped with temperature and pressure sensors to monitor the temperature and pressure of the material inside the kettles in real time and feed the data back to the control system for precise control. The control system receives the feedback data from the temperature and pressure sensors and controls the opening of the proportional regulating valve 2 according to a preset program to achieve automated operation of the system. The proportional regulating valve 2 is an electric proportional regulating valve, and its opening can be automatically adjusted by the control system based on real-time monitoring data to achieve precise control of the refrigerant quantity, reduce manual intervention, and automate operation, thereby improving production efficiency.

[0025] Reference Figure 1 As shown, the heat pump system 1 includes a compressor, a condenser, an expansion valve, and an evaporator, which are used to provide power and temperature regulation for the refrigerant circulation. When the heat pump system 1 is running, the proportional control valve 2 controls a large amount of refrigerant to enter the distillation vessel a3 for the evaporation process, while controlling a small amount of refrigerant to enter the distillation vessel b4 to preheat the material inside the vessel.

[0026] When the amount of secondary steam in distillation vessel a3 decreases and begins to affect the balance of heat pump system 1, proportional control valve 2 controls a large amount of refrigerant to enter distillation vessel b4 for evaporation process, while controlling a small amount of refrigerant to enter distillation vessel a3 to further reduce the moisture content of the material in the vessel.

[0027] Once the moisture content of the material in distillation vessel a3 reaches the standard, it enters the slag discharge process, followed by liquid injection, repeating the above process to circulate distillation vessels a3 and b4 into the evaporation process. In practical applications, the parameters of heat pump system 1 and the control strategy of proportional control valve 2 can be adjusted according to different material characteristics and process requirements to achieve the best crystallization effect. For example, when processing high-viscosity materials, the circulation volume of refrigerant can be appropriately increased to improve evaporation efficiency; when processing materials prone to scaling, regular cleaning and maintenance can be performed to ensure the normal operation of the system.

[0028] Example 2

[0029] Based on Example 1, a slag discharge device is also included, which is used to discharge the material and carry out subsequent processing after the moisture content of the material in distillation vessel a3 or distillation vessel b4 reaches the standard, so as to ensure the overall automated operation.

[0030] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0031] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0032] The implementation principle of the parallel distillation kettle-type low-temperature heat pump crystallization system of this application is as follows:

[0033] When the system starts up, heat pump system 1 provides power and temperature regulation for refrigerant circulation. According to the instructions of the control system, proportional regulating valve 2 controls a large amount of refrigerant to enter distillation vessel a3 for evaporation, while controlling a small amount of refrigerant to enter distillation vessel b4 to preheat the material inside. During the operation of heat pump system 1, the material in distillation vessel a3 evaporates under the action of refrigerant, generating secondary steam. When the amount of secondary steam in distillation vessel a3 decreases and begins to affect the balance of heat pump system 1, the control system will adjust the opening of proportional regulating valve 2 to control a large amount of refrigerant to enter distillation vessel b4 for evaporation, while controlling a small amount of refrigerant to enter distillation vessel a3 to further reduce the moisture content of the material inside the vessel. This achieves precise distribution of refrigerant and alternating evaporation and preheating processes, ensuring the stability and consistency of the crystallization process.

[0034] In addition, both distillation kettles A3 and B4 are equipped with temperature and pressure sensors to monitor the temperature and pressure of the material inside the kettle in real time and feed the data back to the control system. The control system automatically adjusts the opening of the proportional regulating valve 2 according to the preset program and real-time monitoring data to achieve precise control of the refrigerant quantity. When the moisture content of the material in distillation kettle A3 reaches the standard, the control system starts the slag discharge device to discharge the material for subsequent processing. Then, liquid is added again, and the above process is repeated, so that distillation kettles A3 and B4 are circulated into the evaporation process. This can be automated, reduce manual intervention, and thus improve production efficiency.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A parallel distillation kettle type low-temperature heat pump crystallization system, characterized in that, include: Heat pump system (1), proportional control valve (2), distillation vessel a (3), distillation vessel b (4) and control system; A heat pump system (1) includes a compressor, a condenser, an expansion valve, and an evaporator, which provide power and temperature regulation for refrigerant circulation; Both distillation vessel a(3) and distillation vessel b(4) are equipped with temperature sensors and pressure sensors to monitor the temperature and pressure of the material inside the vessel in real time and feed the data back to the control system to achieve precise control. The proportional control valve (2) is connected to the heat pump system (1) and the distillation vessel a (3) and distillation vessel b (4) to control the amount of refrigerant entering the distillation vessel a (3) and distillation vessel b (4) to achieve alternating evaporation and preheating processes.

2. The parallel distillation kettle type low-temperature heat pump crystallization system according to claim 1, characterized in that: When the heat pump system (1) is running, the proportional regulating valve (2) controls a large amount of refrigerant to enter the distillation vessel a (3) for evaporation, while controlling a small amount of refrigerant to enter the distillation vessel b (4) to preheat the material inside the vessel.

3. The parallel distillation kettle type low-temperature heat pump crystallization system according to claim 2, characterized in that: When the amount of secondary steam in distillation vessel a(3) decreases and begins to affect the balance of heat pump system (1), the proportional regulating valve (2) controls a large amount of refrigerant to enter distillation vessel b(4) for evaporation process, while controlling a small amount of refrigerant to enter distillation vessel a(3) to further reduce the moisture content of the material in the vessel.

4. The parallel distillation kettle type low-temperature heat pump crystallization system according to claim 3, characterized in that: Once the moisture content of the material in distillation vessel a(3) reaches the standard, it enters the slag discharge process, and then liquid is added again. The above process is repeated so that distillation vessel a(3) and distillation vessel b(4) can circulate into the evaporation process.

5. The parallel distillation kettle type low-temperature heat pump crystallization system according to claim 1, characterized in that: The control system is used to receive feedback data from temperature and pressure sensors and control the opening of the proportional regulating valve (2) according to a preset program to achieve automated operation of the system. The proportional regulating valve (2) is an electric proportional regulating valve, and its opening can be automatically adjusted by the control system according to real-time monitoring data to achieve precise control of the refrigerant quantity.

6. The parallel distillation kettle type low-temperature heat pump crystallization system according to claim 1, characterized in that: It also includes a slag discharge device, which is used to discharge the material and carry out subsequent processing after the moisture content of the material in the distillation vessel a(3) or distillation vessel b(4) reaches the standard.

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