Temperature-controllable reduced pressure distillation system based on heat pump

Abstract

The utility model relates to the technical field of reduced pressure distillation, and discloses a temperature-controllable reduced pressure distillation system based on a heat pump, which comprises a distillation retort, a vacuum generator and a heat pump unit, and a heating coil is arranged in the distillation retort; an inlet of the vacuum generator is communicated with the upper part of the distillation retort through a pipeline and is used for vacuumizing the interior of the distillation retort; the heat pump unit comprises a compressor, the outlet end of the heating coil is connected with a main condenser through a pipeline, the outlet end of the main condenser is connected with a refrigerant liquid storage tank through a pipeline, the outlet end of the refrigerant liquid storage tank is connected with a plate heat exchanger through a pipeline, and the outlet end of the plate heat exchanger is connected with the inlet end of the compressor through a pipeline. The outlet end of the vacuum generator is connected with the plate heat exchanger through a pipeline, and the outlet end of the compressor communicates with the inlet end of the heating coil through a pipeline. According to the utility model, the distillation temperature can be flexibly adjusted and controlled, the energy consumption is reduced, and the distillation quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of vacuum distillation, especially to a temperature controllable vacuum distillation system based on heat pump. BACKGROUND

[0002] Vacuum distillation is an important method for separating and purifying compounds, especially suitable for separating and purifying high-boiling substances and those compounds that are decomposed, oxidized or polymerized when heated at normal pressure. Vacuum distillation can reduce steam consumption for heating and use lower pressure heating steam. In the prior art, there are also some vacuum distillation systems, such as a Chinese invention patent with application number CN202210597315.3 and the name of a low-temperature heat pump membrane distillation wastewater concentration system. The low-temperature heat pump membrane distillation wastewater concentration system disclosed in the patent utilizes the heat release and heat absorption of the refrigerant in the heat pump to realize the recycling of heat in the system for low-temperature heat pump membrane distillation wastewater concentration. However, it needs to use membrane distillation components and hydrophobic membrane holes and other membrane components, which have high maintenance frequency and cost.

[0003] For example, a Chinese invention patent with application number CN201911203851.5 and the name of a low-temperature water distillation system and method. The patent sets up a circulating water pump outside the evaporator to extract water from the liquid phase zone of the evaporator, which enters the upper part of the evaporator after being heated by the circulating heater, and accelerates water evaporation through spraying to accelerate water evaporation in the evaporator and improve work efficiency. The patent controls the pressure in the heat absorption pipe of the circulating heater to solve the scaling problem in the circulating heater. However, the patent uses a back cooler, a vacuum condenser, a post-cooler, a circulating heater and a re-cooler, which are related to condensation and heating equipment, and the system is relatively complex and has high cost.

[0004] For example, a Chinese invention patent with application number CN201310207221.1 and the name of a methanol vacuum distillation device. The patent does not need external heat source and ice machine, can perform vacuum distillation on crude methanol, has reasonable structure design, and improves efficiency. However, the patent cannot flexibly adjust and control the distillation temperature, so the control level of distillation is not high. UTILITY MODEL CONTENT

[0005] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a temperature controllable vacuum distillation system based on heat pump, which can flexibly adjust and control the distillation temperature, reduce energy consumption and improve distillation quality.

[0006] The utility model discloses a temperature controllable decompression distillation system based on heat pump, including distillation jar, vacuum generator and heat pump unit, the inside of distillation jar is provided with heating coil, the import of vacuum generator is communicated with the upper portion of distillation jar through the pipeline, is used for carrying out the vacuumizing to the inside of distillation jar, the heat pump unit including compressor, the export of heating coil is connected with main condenser through the pipeline, the export of main condenser is connected with refrigerant storage tank through the pipeline, the export of refrigerant storage tank is connected with plate heat exchanger through the pipeline, the export of plate heat exchanger is connected with the import of compressor through the pipeline, and the export of vacuum generator is connected with plate heat exchanger through the pipeline, the export of compressor is communicated with the import of heating coil through the pipeline, so that the heat generated on the exhaust side of compressor is input to the distilled liquid in distillation jar through the heating coil in distillation jar, and the distilled liquid boils and vaporizes under the negative pressure generated by vacuum generator.

[0007] Further, the heating coil is connected in parallel with a secondary condenser through a pipeline, and an electromagnetic valve is arranged at the front end of the secondary condenser.

[0008] Further, a temperature sensor is arranged on the distillation jar.

[0009] Further, an expansion valve is arranged on the pipeline between the outlet of the refrigerant storage tank and the plate heat exchanger.

[0010] Compared with the prior art, the temperature controllable decompression distillation system based on heat pump has the following advantages: the heating coil is connected in parallel with a secondary condenser, an electromagnetic valve is arranged in front of the secondary condenser, and a main condenser is arranged behind the distillation jar and the secondary condenser. When the distilled temperature in the distillation jar is too high, the electromagnetic valve at the front end of the secondary condenser is opened, a part of the heat generated on the exhaust side of the compressor is consumed by the secondary condenser, the heat entering the distillation jar is reduced, the distilled temperature is lowered, and the distilled temperature can be flexibly adjusted and controlled, the energy consumption is reduced, and the distillation quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is the system pipeline connection diagram of the utility model.

[0012] In the drawing: distillation jar-1; heating coil-2; temperature sensor-3; vacuum generator-4; compressor-51; secondary condenser-52; electromagnetic valve-53; main condenser-54; refrigerant storage tank-55; expansion valve-56; plate heat exchanger-57. DETAILED DESCRIPTION

[0013] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0014] The purpose of this invention is to address the shortcomings of existing technologies by providing a temperature-controlled vacuum distillation system based on a heat pump.

[0015] Example 1

[0016] This embodiment provides a temperature-controlled vacuum distillation system based on a heat pump, referring to... Figure 1 As shown, the system includes a distillation tank 1, a vacuum generator 4, and a heat pump unit. The distillation tank 1 is equipped with a heating coil 2. A temperature sensor 3 is installed on the distillation tank 1 to monitor the temperature of the liquid being distilled inside. The inlet of the vacuum generator 4 is connected to the upper part of the distillation tank 1 via a pipe, and is used to create a vacuum inside the distillation tank 1. The heat pump unit includes a compressor 51, a main condenser 54 connected to the outlet end of the heating coil 2 via a pipe, a refrigerant storage tank 55 connected to the outlet end of the main condenser 54 via a pipe, a plate heat exchanger 57 connected to the outlet end of the refrigerant storage tank 55 via a pipe, a compressor 51 connected to the inlet end of the plate heat exchanger 57 via a pipe, a vacuum generator 4 connected to the plate heat exchanger 57 via a pipe, and a compressor 51 connected to the inlet end of the heating coil 2 via a pipe. This allows the heat generated on the exhaust side of the compressor 51 to be input into the distilled liquid in the distillation tank 1 through the heating coil 2. The distilled liquid boils and vaporizes under the negative pressure generated by the vacuum generator 4.

[0017] Reference Figure 1 As shown, a secondary condenser 52 is connected in parallel to the heating coil 2 via pipes, and a solenoid valve 53 is installed at the front end of the secondary condenser 52. The main condenser 54 is located after the distillation tank 1 and the secondary condenser 52. As the main heat dissipation component, it is used to dissipate heat generated by the compressor 51 that exceeds its cooling capacity. An expansion valve 56 is installed on the pipe between the outlet end of the refrigerant storage tank 55 and the plate heat exchanger 57. After condensation, the refrigerant passes through the refrigerant storage tank 55 and then through the throttling effect of the expansion valve 56, inputting cooling capacity into the plate heat exchanger 57. At the plate heat exchanger 57, the hot vapor discharged from the distillation tank 1 undergoes heat exchange, and the hot vapor is condensed into liquid.

[0018] The utility model discloses a temperature controllable pressure reduction distillation system based on heat pump, temperature sensor 3 for real -time monitoring the temperature of the liquid distilled in distillation tank 1 is installed on distillation tank 1. When working, the heat generated by the exhaust side of compressor 51 is input to the liquid distilled in distillation tank 1 through heating coil 2 in distillation tank 1, and the liquid distilled is boiled and vaporized under the negative pressure generated by vacuum generator 4, and then the heat generated by compressor 51 is consumed by condensation of main condenser 54, and the refrigerant after condensation is input to plate heat exchanger 57 through the throttling action of refrigerant storage tank 55 and expansion valve 56, and at plate heat exchanger 57, the hot steam discharged from distillation tank 1 is cooled and exchanged, and the hot steam is condensed into liquid.

[0019] When the distillation temperature measured by temperature sensor 3 is too high, electromagnetic valve 53 at the front end of auxiliary condenser 52 is opened, and part of the heat generated by the exhaust side of compressor 51 is consumed by auxiliary condenser 52, so that the heat entering distillation tank 1 is reduced, and the distillation rate of the liquid in distillation tank 1 is reduced, and the distillation temperature is also reduced, so that the distillation temperature can be flexibly adjusted and controlled, the energy consumption is reduced, and the distillation quality is improved.

[0020] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A heat pump based temperature controllable vacuum distillation system, characterized by: The application relates to a distillation device, which comprises a distillation tank (1), a vacuum generator (4) and a heat pump unit, wherein the distillation tank (1) is internally provided with a heating coil (2); the inlet of the vacuum generator (4) is communicated with the upper part of the distillation tank (1) through a pipeline, and the inside of the distillation tank (1) is vacuumized; the heat pump unit comprises a compressor (51); the outlet end of the heating coil (2) is connected with a main condenser (54) through a pipeline; the outlet end of the main condenser (54) is connected with a refrigerant storage tank (55) through a pipeline; the outlet end of the refrigerant storage tank (55) is connected with a plate heat exchanger (57) through a pipeline; the outlet end of the plate heat exchanger (57) is connected with the inlet end of the compressor (51) through a pipeline; the outlet end of the vacuum generator (4) is connected with the plate heat exchanger (57) through a pipeline; and the outlet end of the compressor (51) is communicated with the inlet end of the heating coil (2) through a pipeline, so that the heat generated on the exhaust side of the compressor (51) is input into a distilled liquid in the distillation tank (1) through the heating coil (2) in the distillation tank (1), and the distilled liquid is boiled and vaporized under the negative pressure generated by the vacuum generator (4).

2. The heat pump based temperature controlled vacuum distillation system of claim 1, wherein: A sub-condenser (52) is connected in parallel with the heating coil (2) through a pipeline.

3. The heat pump based temperature controlled vacuum distillation system of claim 2, wherein: A temperature sensor (3) is installed on the distillation tank (1).

4. The heat pump based temperature controlled vacuum distillation system of claim 3, wherein: An expansion valve (56) is installed on the pipeline between the outlet end of the refrigerant storage tank (55) and the plate heat exchanger (57). The application relates to a distillation device, which comprises a distillation tank (1), a vacuum generator (4) and a heat pump unit, wherein the distillation tank (1) is internally provided with a heating coil (2); the inlet of the vacuum generator (4) is communicated with the upper part of the distillation tank (1) through a pipeline, and the inside of the distillation tank (1) is vacuumized; the heat pump unit comprises a compressor (51); the outlet end of the heating coil (2) is connected with a main condenser (54) through a pipeline; the outlet end of the main condenser (54) is connected with a refrigerant storage tank (55) through a pipeline; the outlet end of the refrigerant storage tank (55) is connected with a plate heat exchanger (57) through a pipeline; the outlet end of the plate heat exchanger (57) is connected with the inlet end of the compressor (51) through a pipeline; the outlet end of the vacuum generator (4) is connected with the plate heat exchanger (57) through a pipeline; and the outlet end of the compressor (51) is communicated with the inlet end of the heating coil (2) through a pipeline, so that the heat generated on the exhaust side of the compressor (51) is input into a distilled liquid in the distillation tank (1) through the heating coil (2) in the distillation tank (1), and the distilled liquid is boiled and vaporized under the negative pressure generated by the vacuum generator (4). A sub-condenser (52) is connected in parallel with the heating coil (2) through a pipeline. A temperature sensor (3) is installed on the distillation tank (1). An expansion valve (56) is installed on the pipeline between the outlet end of the refrigerant storage tank (55) and the plate heat exchanger (57).

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