Heat pump rectification system

Abstract

The utility model discloses a heat pump rectification system and relates to the technical field of chemical separation and energy-saving transformation. The heat pump rectification system comprises a rectification tower and a heat pump device, a condenser is arranged at the top of the rectification tower, and a reboiler is arranged at the bottom of the rectification tower; the heat pump device comprises a compressor, an air inlet of the compressor is connected with a gaseous working medium outlet of the condenser through a pipeline, an air outlet of the compressor is connected with a tube pass inlet of the reboiler through a pipeline, and a tube pass outlet of the reboiler is connected with a liquid working medium reflux inlet of the condenser through a pipeline. According to the technical scheme, the high-temperature gaseous working medium passes through the tube pass of the reboiler, heat exchange is sufficient, the heat exchange effect is good, the low-temperature liquid working medium flowing out of the reboiler can meet the heat exchange requirement of the condenser, further condensation treatment is not needed, and energy consumption is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical separation and energy saving reconstruction technical field, especially relates to a heat pump rectification system. BACKGROUND

[0002] Rectification is a kind of physical process using the volatility or boiling point difference of each component in liquid mixture to separate.The basic principle is that through multiple partial vaporization and partial condensation, volatile components (light components) are constantly transferred from liquid phase to gas phase, while difficult volatile components are transferred from gas phase to liquid phase, so as to realize the separation and purification of mixture.

[0003] Rectification process is usually carried out in rectification column, and the column is equipped with tray or packing, so that the ascending steam and descending condensate liquid contact and mass transfer multiple times, so that slight evaporation and condensation are realized at each stage, and the purity of product is gradually improved.The rectification column is composed of feed section, rectification section and stripping section, and through the action of column top liquid reflux and column bottom gas reflux, temperature gradient and concentration gradient are established, and finally high-purity light component is obtained at the top of column, and heavy component is obtained at the bottom of column.

[0004] In order to realize evaporation and condensation, cooling link needs to be added to the top of rectification column, and part of heat is removed from column top material steam, and part of cooling liquid is refluxed;And heating link needs to be added to the column still of rectification column to generate steam.In the traditional structure of rectification column, both purposes need to consume public engineering to realize, that is, the top is cooled by cooling water, and the column still is heated by heating steam.It can be seen that the rectification process is a process that needs refrigeration and heating, and in connection with the working principle of heat pump, for single-tower structure, heat pump is obviously very suitable for energy-saving structure, and the use of heat pump can greatly improve the energy utilization efficiency in rectification process, save energy consumption cost and improve the economic benefit of enterprise.

[0005] Heat pump rectification is to compensate energy or consume mechanical work, and the heat released in the condenser at the top of rectification column is transferred to the heat required by reboiler at the bottom, that is, the steam at the top is used as heat source of reboiler at the bottom to reduce energy consumption.However, the existing steam at the top is used as heat source of reboiler at the bottom, and the heat exchange effect is poor, so that after the steam (gaseous working medium) at the top exchanges heat with the material in the reboiler at the bottom, the temperature of the formed liquid working medium is too high, and the liquid working medium needs to be cooled and then returned to the top. UTILITY MODEL CONTENTS

[0006] The main purpose of the utility model is to provide a heat pump rectification system, which aims to solve the problem of poor heat exchange effect of reboiler at the bottom in the existing heat pump rectification system.

[0007] In order to realize the above-mentioned purpose, the utility model provides a heat pump rectification system, which comprises:

[0008] A distillation column, which is provided with a condenser at the top and a reboiler at the bottom;

[0009] A heat pump device, which comprises a compressor, an inlet of the compressor is connected with an outlet of the gaseous working medium of the condenser through a pipeline, an outlet of the compressor is connected with an inlet of the tube side of the reboiler through a pipeline, an outlet of the tube side of the reboiler is connected with a reflux inlet of the liquid working medium of the condenser through a pipeline.

[0010] In an embodiment, an inlet of the shell side of the reboiler is connected with an outlet of the material of the bottom of the distillation column through a pipeline, and an outlet of the shell side of the reboiler is connected with a reflux inlet of the material of the bottom of the distillation column through a pipeline.

[0011] In an embodiment, an inlet of the shell side of the condenser is connected with an outlet of the gaseous material of the top of the distillation column through a pipeline, and an outlet of the shell side of the condenser is connected with a reflux inlet of the liquid material of the top of the distillation column through a pipeline.

[0012] In an embodiment, a reflux tank, a reflux pump and a reflux pipeline are sequentially arranged between the outlet of the shell side of the condenser and the reflux inlet of the liquid material of the top of the distillation column, and a flow regulating valve is arranged on the reflux pipeline.

[0013] In an embodiment, the heat pump device further comprises a throttling valve arranged between the outlet of the tube side of the reboiler and the reflux inlet of the liquid working medium of the condenser; and / or,

[0014] The heat pump device further comprises a gas storage tank arranged between the outlet of the compressor and the inlet of the tube side of the reboiler; and / or,

[0015] The heat pump device further comprises a gas-liquid separator arranged between the inlet of the compressor and the outlet of the gaseous working medium of the condenser.

[0016] In an embodiment, a liquid storage tank is arranged between the reboiler and the throttling valve.

[0017] In an embodiment, a molecular sieve filter is arranged between the liquid storage tank and the throttling valve.

[0018] In an embodiment, an oil separator is arranged between the compressor and the gas storage tank.

[0019] In an embodiment, a metal filter is arranged between the gas-liquid separator and the compressor.

[0020] In an embodiment, the compressor is a screw compressor, a centrifugal compressor or a Roots compressor.

[0021] The utility model discloses a technical scheme, the material steam that adopts from the tower top of rectifying tower is input in condenser, exchanges heat with low temperature liquid state working medium in condenser, and the liquid material backflow that forms is returned to rectifying tower, and low temperature working medium heat absorption forms gaseous working medium, and from gaseous working medium export flows out condenser, then enters compressor, and compressor pressurizes the gaseous working medium and heats up, and the high temperature gaseous working medium that forms is as the heat source of reboiler. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will be briefly introduced the drawing needed to be used in the embodiment or prior art description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for ordinary skilled person in the art, under the premise of not paying the creative labor, other drawings can also be obtained according to the structure shown in these drawings.

[0023] Figure 1 The utility model provides a kind of structure schematic diagram of heat pump rectification system embodiment.

[0024] REFERENCE SIGNS:

[0025] 100, heat pump rectification system;1, rectifying tower;11, condenser;12, backflow tank;13, backflow pump;14, backflow pipe;15, flow regulating valve;16, tower top discharge pipe;17, reboiler;18, tower cauldron discharge pipe;21, gas-liquid separator;22, metal filter;23, compressor;24, oil separator;25, gas storage tank;26, liquid storage tank;27, molecular sieve filter;28, throttling valve.

[0026] The implementation, functional characteristics and advantages of the utility model will be further described with reference to the drawings. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0028] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0029] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0030] The heat pump rectification is to compensate energy or consume mechanical work, and transfer the heat released in the overhead condenser of the rectification column to the heat required by the column bottom reboiler, that is, the overhead vapor is used as the heat source of the column bottom reboiler to reduce energy consumption. However, the existing overhead vapor used as the heat source of the column bottom reboiler has the problem of poor heat exchange effect, which leads to that the temperature of the liquid working medium formed after the overhead vapor (gaseous working medium) exchanges heat with the material in the column bottom reboiler is too high, and the liquid working medium needs to be returned to the overhead after condensation treatment.

[0031] Therefore, the present application provides a heat pump rectification system to solve the problem of poor heat exchange effect of the column bottom reboiler in the existing heat pump rectification system.

[0032] Please refer to Figure 1In an embodiment of the present application, the heat pump rectification system 100 comprises a rectification tower 1 and a heat pump device, the rectification tower 1 is provided with a condenser 11 at the top and a reboiler 17 at the bottom; the heat pump device comprises a compressor 23, the gas inlet of the compressor 23 is connected with the gaseous working medium outlet of the condenser 11 through a pipeline, the gas outlet of the compressor 23 is connected with the tube side inlet of the reboiler 17 through a pipeline, and the tube side outlet of the reboiler 17 is connected with the liquid working medium backflow port of the condenser 11 through a pipeline.

[0033] In the technical scheme of the present application, the material vapor taken from the top of the rectification tower 1 is input into the condenser 11, exchanges heat with the low-temperature liquid working medium in the condenser 11, and then forms liquid material backflow to the rectification tower 1, and the low-temperature working medium absorbs heat to form gaseous working medium, which flows out of the condenser 11 from the gaseous working medium outlet, and then enters the compressor 23, the compressor 23 pressurizes and heats the gaseous working medium to form high-temperature gaseous working medium as the heat source of the reboiler 17. The high-temperature gaseous working medium flows into the heat exchange tube in the reboiler 17 through the tube side inlet of the reboiler 17, and the liquid material is in the shell side of the reboiler 17. Since the inner diameter of the heat exchange tube is small, and the liquid material forms a surrounding state to the heat exchange tube, the low-temperature liquid material in the shell side and the high-temperature gaseous working medium in the tube side can be fully heat-exchanged. After heat exchange, the low-temperature liquid material forms gaseous material and backflows to the rectification tower 1, and the high-temperature gaseous working medium forms low-temperature liquid working medium and backflows to the condenser 11 through the liquid working medium backflow port to perform the next cycle. Since the heat exchange of the high-temperature gaseous working medium in the reboiler 17 is sufficient, the heat exchange effect is good, so that the low-temperature liquid working medium flowing out of the reboiler 17 can meet the heat exchange demand of the condenser 11, and further condensation treatment is not required, thereby saving energy consumption.

[0034] It should be noted that the compression ratio of the compressor 23 is 2.0-10.0, and the temperature rise range is 20-100℃. The working medium can be R134a, or other working media can be used according to the production process requirements.

[0035] It can be understood that the gaseous working medium outlet of the condenser 11 refers to the tube side outlet of the condenser 11, and the liquid working medium backflow port of the condenser 11 refers to the tube side inlet of the condenser 11. The rectification tower 1 is provided with a material inlet, and the material enters the rectification tower 1 through the material inlet to perform the rectification process. The material can be crude methanol, or other materials according to production requirements. The tower top discharge pipe 16 is branched on the backflow pipe 14, and the tower top discharge of the rectification tower 1 is taken from the tower top discharge pipe 16; the rectification tower 1 is provided with a tower kettle discharge pipe 18 at the bottom, and the tower kettle discharge of the rectification tower 1 is taken from the tower kettle discharge pipe 18; the discharge adjusting valve is arranged on the tower top discharge pipe 16 and the tower kettle discharge pipe 18.

[0036] Specifically, the shell side inlet of the reboiler 17 is connected with the material outlet of the bottom of the distillation column 1 through a pipeline, and the shell side outlet of the reboiler 17 is connected with the material reflux inlet of the bottom of the distillation column 1 through a pipeline.

[0037] By adopting the above technical scheme, the liquid material at the bottom of the distillation column 1 can enter the reboiler 17 through the shell side inlet of the reboiler 17 to exchange heat with the high-temperature gaseous working medium in the reboiler 17, and the gaseous material formed is discharged from the reboiler 17 through the shell side outlet of the reboiler 17 and then refluxes to the distillation column 1.

[0038] Specifically, the shell side inlet of the condenser 11 is connected with the gaseous material outlet at the top of the distillation column 1 through a pipeline, and the shell side outlet of the condenser 11 is connected with the liquid material reflux inlet at the top of the distillation column 1 through a pipeline.

[0039] By adopting the above technical scheme, the material vapor taken out at the top of the distillation column 1 can enter the condenser 11 through the shell side inlet of the condenser 11 to exchange heat with the low-temperature liquid working medium in the condenser 11, and the low-temperature liquid material formed is discharged from the condenser 11 through the shell side outlet of the condenser 11 and then refluxes to the distillation column 1.

[0040] Further, the shell side outlet of the condenser 11 and the liquid material reflux inlet at the top of the distillation column 1 are sequentially provided with a reflux tank 12, a reflux pump 13 and a reflux pipe 14, and the reflux pipe 14 is provided with a flow regulating valve 15.

[0041] By adopting the above technical scheme, the material condensed by the condenser 11 flows to the reflux tank 12 and then flows to the liquid material reflux inlet at the top of the distillation column 1 through the reflux pipe 14 to reflux into the distillation column 1. The flow regulating valve 15 provided on the reflux pipe 14 can regulate the flow of the reflux material.

[0042] Further, the heat pump device further comprises a throttling valve 28 arranged between the pipe side outlet of the reboiler 17 and the liquid working medium reflux inlet of the condenser 11; and / or, the heat pump device further comprises a gas storage tank 25 arranged between the gas outlet of the compressor 23 and the pipe side inlet of the reboiler 17; and / or, the heat pump device further comprises a gas-liquid separator 21 arranged between the gas inlet of the compressor 23 and the gaseous working medium outlet of the condenser 11.

[0043] By adopting the above technical scheme, the throttling valve 28 is arranged between the pipe passage outlet of the reboiler 17 and the liquid working medium return port of the condenser 11, the low-temperature liquid working medium flowing out of the reboiler 17 flows to the throttling valve 28 through a pipeline, and the throttling valve 28 can perform cooling and pressure reduction on the low-temperature liquid working medium, so that the working medium can sufficiently exchange heat with the material vapor extracted from the top of the tower after returning to the condenser 11. It can be understood that a pipeline is arranged between the pipe passage outlet of the reboiler 17 and the liquid working medium return port of the condenser 11, and the throttling valve 28 is arranged on the pipeline.

[0044] The gas tank 25 is arranged between the gas outlet of the compressor 23 and the pipe passage inlet of the reboiler 17, the high-temperature gaseous working medium flowing out of the compressor 23 enters the gas tank 25, the high-temperature gaseous working medium in the gas tank 25 flows to the pipe passage inlet of the reboiler 17, and the gas tank 25 can ensure that the high-temperature gaseous working medium is stably input into the reboiler 17, thereby better ensuring the heat exchange effect of the reboiler 17. It can be understood that the gas inlet of the gas tank 25 is connected with the gas outlet of the compressor 23 through a pipeline, and the gas outlet of the gas tank 25 is connected with the pipe passage inlet of the reboiler 17 through a pipeline.

[0045] The gas-liquid separator 21 is arranged between the gas inlet of the compressor 23 and the gaseous working medium outlet of the condenser 11, the gaseous working medium flowing out of the condenser 11 enters the gas-liquid separator 21, and the gas-liquid separator 21 can perform gas-liquid separation to avoid liquid working medium entering the compressor 23, and the gaseous working medium separated by the gas-liquid separator 21 flows to the compressor 23. It can be understood that the gas inlet of the gas-liquid separator 21 is connected with the gaseous working medium outlet of the condenser 11 through a pipeline, and the gas outlet of the gas-liquid separator 21 is connected with the gas inlet of the compressor 23 through a pipeline.

[0046] Specifically, the reboiler 17 and the throttling valve 28 are connected through the liquid tank 26.

[0047] By adopting the above technical scheme, the liquid tank 26 is arranged between the pipe passage outlet of the reboiler 17 and the inlet of the throttling valve 28, the low-temperature liquid working medium flowing out of the reboiler 17 flows to the liquid tank 26, the low-temperature liquid working medium in the liquid tank 26 flows to the throttling valve 28, and the liquid tank 26 can ensure that the low-temperature liquid working medium is stably transported to the throttling valve 28. It can be understood that the pipe passage outlet of the reboiler 17 is connected with the liquid inlet of the liquid tank 26 through a pipeline, and the liquid outlet of the liquid tank 26 is connected with the inlet of the throttling valve 28 through a pipeline.

[0048] Further, the liquid tank 26 and the throttling valve 28 are connected through the molecular sieve filter 27. The molecular sieve filter 27 can remove water and impurities in the low-temperature liquid working medium. It can be understood that a pipeline is arranged between the liquid outlet of the liquid tank 26 and the inlet of the throttling valve 28, and the molecular sieve filter 27 is arranged on the pipeline.

[0049] Specifically, the oil separator 24 is arranged between the compressor 23 and the gas tank 25. The high-temperature gaseous working medium flowing out of the compressor 23 flows to the oil separator 24, and the oil separator 24 can separate the oil component in the high-temperature gaseous working medium. The high-temperature gaseous working medium separated by the oil separator 24 flows to the gas tank 25. It can be understood that the gas outlet of the compressor 23 and the gas inlet of the gas tank 25 are connected by a pipeline, and the oil separator 24 is arranged on the pipeline.

[0050] Specifically, the metal filter 22 is arranged between the gas-liquid separator 21 and the compressor 23. The gaseous working medium separated by the gas-liquid separator 21 flows to the metal filter 22, and the metal filter 22 can remove impurities in the gaseous working medium. The gaseous working medium filtered by the metal filter 22 flows to the compressor 23. It can be understood that the gas outlet of the gas-liquid separator 21 and the gas inlet of the compressor 23 are connected by a pipeline, and the metal filter 22 is arranged on the pipeline.

[0051] Specifically, the compressor 23 is a screw compressor 23, a centrifugal compressor 23 or a Roots compressor 23.

[0052] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields within the technical concept of the present application is included in the patent protection scope of the present application.

Claims

1. A heat pump rectification system, characterized by, The application relates to a distillation tower and a heat pump device. The distillation tower is provided with a condenser at the top and a reboiler at the bottom. The heat pump device comprises a compressor, the gas inlet of the compressor is connected with the gas outlet of the condenser through a pipeline, the gas outlet of the compressor is connected with the inlet of the tube side of the reboiler through a pipeline, and the outlet of the tube side of the reboiler is connected with the liquid backflow port of the condenser through a pipeline.

2. The heat pump rectification system of claim 1, wherein, The inlet of the shell side of the reboiler is connected with the material outlet of the bottom of the distillation tower through a pipeline, and the outlet of the shell side of the reboiler is connected with the material backflow port of the bottom of the distillation tower through a pipeline.

3. The heat pump rectification system of claim 1, wherein, The inlet of the shell side of the condenser is connected with the gaseous material outlet of the top of the distillation tower through a pipeline, and the outlet of the shell side of the condenser is connected with the liquid material backflow port of the top of the distillation tower through a pipeline.

4. The heat pump rectification system of claim 3, wherein, A backflow tank, a backflow pump and a backflow pipeline are sequentially arranged between the outlet of the shell side of the condenser and the liquid material backflow port of the top of the distillation tower, and a flow regulating valve is arranged on the backflow pipeline.

5. The heat pump rectification system of claim 1 wherein, The heat pump device further comprises a throttling valve arranged between the outlet of the tube side of the reboiler and the liquid backflow port of the condenser; and / or, The heat pump device further comprises a gas storage tank arranged between the gas outlet of the compressor and the inlet of the tube side of the reboiler; and / or, The heat pump device further comprises a gas-liquid separator arranged between the gas inlet of the compressor and the gas outlet of the condenser.

6. The heat pump rectification system of claim 5, wherein, A liquid storage tank is arranged between the reboiler and the throttling valve.

7. The heat pump rectification system of claim 6, wherein, A molecular sieve filter is arranged between the liquid storage tank and the throttling valve.

8. The heat pump rectification system of claim 5, wherein, An oil separator is arranged between the compressor and the gas storage tank.

9. The heat pump rectification system as claimed in claim 5, wherein, A metal filter is arranged between the gas-liquid separator and the compressor.

10. The heat pump rectification system as claimed in claim 1, wherein, The compressor is a screw compressor, a centrifugal compressor or a Roots compressor.

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