CN211836379U - Compression type heat pump rectification system for acetic acid concentration - Google Patents
Compression type heat pump rectification system for acetic acid concentration Download PDFInfo
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- CN211836379U CN211836379U CN201921707449.6U CN201921707449U CN211836379U CN 211836379 U CN211836379 U CN 211836379U CN 201921707449 U CN201921707449 U CN 201921707449U CN 211836379 U CN211836379 U CN 211836379U
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Abstract
A compression heat pump rectification system for acetic acid concentration comprises a rectification tower, a tower bottom reboiler and a reflux tank; the top of the rectifying tower is provided with a gas phase outlet and a reflux port, the middle of the rectifying tower is provided with a raw material inlet, and the bottom of the rectifying tower is provided with a liquid outlet and a liquid inlet. The compression type heat pump rectification system for acetic acid concentration further comprises a compressor, the compressor is arranged at the top of the rectification tower, and an inlet of the compressor is communicated with a gas phase outlet of the rectification tower; the hot end inlet of the tower bottom reboiler is communicated with the outlet of the compressor, and the hot end outlet of the tower bottom reboiler is communicated with the inlet of the reflux tank; a cold end inlet of the tower bottom reboiler is communicated with a liquid outlet of the rectifying tower, and a cold end outlet of the tower bottom reboiler is communicated with a liquid inlet of the rectifying tower; the reflux tank is communicated with a reflux opening of the rectifying tower, and is used for discharging a part of liquid as a tower top product from the reflux tank, and returning the other part of liquid as reflux to the rectifying tower. After the technical scheme is adopted, the purpose of saving energy consumption with lower cost is achieved.
Description
Technical Field
The utility model relates to a rectification technology for acetic acid concentration.
Background
Acetic acid is an important solvent, and is generally used as a solvent for the reaction in the process of producing terephthalic acid by oxidizing p-xylene. The oxidation reaction of p-xylene produces a large amount of water, resulting in dilution of the acetic acid solvent. In order to maintain the concentration of acetic acid in the aqueous acetic acid solution, the acetic acid is usually concentrated by distillation.
The boiling point of acetic acid is 118 ℃ and the boiling point of water is 100 ℃ under normal pressure, the relative volatility of an acetic acid-water system is low, and the acetic acid has strong association effect, so that the conventional rectification needs more tower plates and higher reflux ratio, and the energy consumption is higher. In order to save energy, the separation of acetic acid and water is realized by adopting an azeotropic distillation method in some processes, and the azeotropic agent is usually acetate. Although azeotropic distillation can reduce energy consumption, the acetate ester entrainer is expensive and is a flammable medium, thereby increasing the additional cost of separation. There are also processes that use multi-effect pump rectification or multi-effect heat pump rectification, but both of these approaches result in a substantial increase in equipment investment.
Disclosure of Invention
The utility model aims to solve the technical problem that a compression heat pump rectification system of acetic acid concentration is provided, it has reduced the energy consumption of acetic acid at the concentration process, and the implementation cost is low.
In order to solve the technical problem, the utility model provides a compression heat pump rectification system for acetic acid concentration, which comprises a rectification tower, a tower bottom reboiler and a reflux tank; the top of the rectifying tower is provided with a gas phase outlet and a reflux port, the middle of the rectifying tower is provided with a raw material inlet, and the bottom of the rectifying tower is provided with a liquid outlet and a liquid inlet; the compression type heat pump rectification system for acetic acid concentration is characterized by comprising a compressor, wherein the compressor is arranged at the top of a rectification tower, and an inlet of the compressor is communicated with a gas-phase outlet of the rectification tower; the hot end inlet of the tower bottom reboiler is communicated with the outlet of the compressor, and the hot end outlet of the tower bottom reboiler is communicated with the inlet of the reflux tank; a cold end inlet of the tower bottom reboiler is communicated with a liquid outlet of the rectifying tower, and a cold end outlet of the tower bottom reboiler is communicated with a liquid inlet of the rectifying tower; the reflux tank is communicated with a reflux opening of the rectifying tower, and is used for discharging a part of liquid as a tower top product from the reflux tank, and returning the other part of liquid as reflux to the rectifying tower.
After the technical scheme is adopted, make the utility model discloses a following advantage:
1. the embodiment of the utility model provides an add the compressor on the basis of current acetic acid concentration rectifying column, as the heat pump of gaseous pressure boost in top of the tower, directly compress the top of the tower steam with the compressor, improved the pressure and the temperature of top of the tower steam by a wide margin, reuse top of the tower steam after the pressure boost directly to the reboiler heat supply at the bottom of the rectifying column tower, thereby reached and realized the purpose of practicing thrift the energy consumption with lower cost;
2. the embodiment of the utility model provides a through inlet pressure and the exit pressure to the compressor control for the temperature that gets into the steam of reboiler at the bottom of the tower after the compressor compression intensifies can remain stable, thereby makes the concentration of acetic acid product also remain stable, has guaranteed the quality of the acetic acid product after the rectification.
Drawings
Fig. 1 shows a schematic structural diagram of an embodiment of a compression heat pump rectification system for acetic acid concentration according to the present invention.
Fig. 2 shows a schematic block diagram of a pressure control system of an embodiment of the compression heat pump rectification system for acetic acid concentration according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 shows a schematic structural diagram of an embodiment of a compression heat pump rectification system for acetic acid concentration according to the present invention. Referring to fig. 1, a compression heat pump rectification system for acetic acid concentration according to an embodiment of the present invention includes a rectification column 1, a tower bottom reboiler 2, a reflux tank 3 and a compressor 4.
The top of the rectifying tower 1 is provided with a gas phase outlet and a reflux port, the middle part of the rectifying tower 1 is provided with a raw material inlet, and the bottom of the rectifying tower 1 is provided with a liquid outlet and a liquid inlet. The compressor 4 is arranged at the top of the rectifying tower 1, and the inlet of the compressor 4 is communicated with the gas-phase outlet of the rectifying tower 1.
A hot end inlet of the tower bottom reboiler 2 is communicated with an outlet of the compressor 4, and a hot end outlet of the tower bottom reboiler 2 is communicated with an inlet of the reflux tank 3; the cold end inlet of the tower bottom reboiler 2 is communicated with the liquid outlet of the rectifying tower 1, and the cold end outlet of the tower bottom reboiler 2 is communicated with the liquid inlet of the rectifying tower 1.
The reflux tank 3 is communicated with a reflux port of the rectifying tower 1, the reflux tank 3 is used for discharging a part of liquid as a tower top product from the reflux tank 3, and the other part of liquid returns to the rectifying tower 1 as reflux.
In this embodiment, the rectifying column 1 may be a plate column or a packed column, and is preferably a plate column. The plate number of the plate tower is 50-140. The compressor 4 is a screw compressor.
Please refer to fig. 2. Preferably, a compression heat pump rectification system for acetic acid concentration according to an embodiment of the present invention includes a first regulating valve 51, a second regulating valve 52, a first pressure transmitter 61, a second pressure transmitter 62 and a controller 7.
An inlet of the first regulating valve 51 and an inlet of the second regulating valve 52 are respectively communicated with the steam line 8, an outlet of the first regulating valve 51 is communicated with an inlet of the compressor 4, and an outlet of the second regulating valve 52 is communicated with an outlet of the compressor 4.
The first pressure transmitter 61 is used to detect the inlet pressure of the compressor 4 and the second pressure transmitter 62 is used to detect the outlet pressure of the compressor 4.
The controller 7 is configured to receive the valve state signals fed back by the first and second regulating valves 51 and 52 and the detection results sent by the first and second pressure transmitters 61 and 62, and control the opening degrees of the first and second regulating valves 51 and 52 to regulate the flow rates of the water vapor flowing into the inlet and the outlet of the compressor 4, so as to maintain the inlet pressure and the outlet pressure of the compressor 4 stable. The controller 7 may be a PLC controller.
In this embodiment, the controller 7 is configured to perform PID adjustment or PI adjustment on the opening of the first regulating valve 51 according to a difference between an inlet pressure set value and an inlet pressure detection value, so as to stabilize the inlet pressure of the compressor 4 at the inlet pressure set value, and perform PID adjustment or PI adjustment on the opening of the second regulating valve 52 according to a difference between an outlet pressure set value and an outlet pressure detection value, so as to stabilize the outlet pressure of the compressor 4 at the outlet pressure set value, thereby coping with system operation fluctuation, so that the pressure and temperature of steam entering the tower bottom reboiler 2 after being compressed and heated by the compressor 4 can be kept stable, further the concentration of an acetic acid product can be kept stable, and the quality of the rectified acetic acid product can be ensured.
According to the utility model discloses a concentrated compression heat pump rectification system's of acetic acid rectification process mainly includes following step:
feeding an acetic acid solution from the middle part of a rectifying tower 1, and rectifying and concentrating the acetic acid solution by the rectifying tower 1;
discharging a part of tower bottom liquid of the rectifying tower 1 as a tower bottom product from the rectifying tower 1, and feeding the other part of tower bottom liquid into a tower bottom reboiler 2 from the rectifying tower 1;
the gas at the top of the rectifying tower 1 enters a compressor 4, the steam compressed and heated by the compressor 4 directly enters a tower bottom reboiler 2, tower bottom liquid entering the tower bottom reboiler 2 is heated, the steam is condensed, and the heated tower bottom liquid flows back to the tower bottom;
and (3) feeding the condensate after the steam condensation into a reflux tank 3, discharging a part of the condensate as a tower top product from the reflux tank 3, and returning the other part of the condensate as reflux from the reflux tank 3 to the tower top of the rectifying tower 1.
Optionally, the operation pressure of the rectifying tower 1 is 0.1-0.4MPa, the tower top temperature is 100-120 ℃, the tower bottom temperature is 130-150 ℃, and the reflux ratio is 2.0-8.0.
Alternatively, the compressor 4 is a screw compressor. The inlet temperature of the screw compressor is 100-120 ℃, the inlet pressure is 0.1-0.2 MPa, the outlet temperature is 135-155 ℃, and the outlet pressure is 0.3-0.6 MPa. The compressor 4 can greatly increase the pressure and temperature of the steam.
The compressor 4 can be supplemented with steam according to the requirements of working conditions. When the compressor 4 compresses the tower top gas, the inlet pressure and the outlet pressure of the compressor 4 are respectively detected in real time, and the inlet pressure and the outlet pressure of the compressor 4 are kept stable by controlling the flow of the water vapor flowing to the inlet and the outlet of the compressor 4.
The following describes a specific operation flow and implementation steps of a compression heat pump rectification system for acetic acid concentration according to an embodiment of the present invention with reference to fig. 1 and a specific application example.
And a dilute acetic acid stream S1 with the acetic acid mass concentration of 40% enters the rectifying tower from the middle part of the rectifying tower 1, and after the dilute acetic acid stream S1 is concentrated in the rectifying tower 1, the mass concentration of acetic acid discharged from the top of the tower is lower than 0.1%, and the mass concentration of acetic acid discharged from the bottom of the tower is higher than 90%. The temperature of the bottom of the rectifying tower 1 is 130 ℃, the temperature of the top of the tower is 100 ℃, the operating pressure of the top of the tower is 0.11MPa, the operating pressure of the bottom of the tower is 0.19MPa, the reflux ratio of the top of the tower is 4.2, and the reflux ratio of the bottom of the tower is 6.5.
The steam at the top of the tower directly enters the compressor 4, the compressor 4 compresses the steam at the top of the tower, the temperature and the pressure of the steam are improved, the temperature of the steam at the outlet of the compressor is 135 ℃, and the outlet pressure is 0.35 MPa. The inlet and the outlet of the compressor 4 are both connected with a steam stream S2, the controller 7 performs PID adjustment or PI adjustment on the opening degree of the first regulating valve 51 according to the difference between the inlet pressure set value and the inlet pressure detection value to stabilize the inlet pressure of the compressor 4 at the inlet pressure set value, and performs PID adjustment or PI adjustment on the opening degree of the second regulating valve 52 according to the difference between the outlet pressure set value and the outlet pressure detection value to stabilize the outlet pressure of the compressor 4 at the outlet pressure set value to maintain the heat and pressure stability of the rectification system.
And introducing steam pressurized by the compressor 4 into the tower bottom reboiler 2 as heating steam to heat the tower bottom liquid entering the tower bottom reboiler 2. In the reboiler, heating steam passes through the shell pass, and tower bottoms pass through the tube pass. The shell side temperature is 135 ℃ and the pressure is 0.35 MPa. The tube pass temperature is 130 ℃ and the pressure is 0.19 MPa. After the steam exchanges heat with the tower bottom liquid, the steam is condensed into condensate in a tower bottom reboiler 2.
The condensate after the steam condensation enters the reflux tank 3. The discharge of the reflux tank 3 is divided into two parts, wherein one part of the stream S3 enters the subsequent flow as an overhead product, and the other part of the stream S4 returns to the top of the rectifying tower 1 as a reflux liquid.
The bottom discharge of the rectification column 1 is divided into stream S5 and stream S6. And the stream S5 is heated by a tower bottom reboiler 2 and then flows back to the tower bottom of the rectifying tower 1, and the stream S6 is used as a tower bottom product and enters a subsequent process.
The embodiment of the utility model provides an add the compressor on the basis of current acetic acid concentration rectifying column, as the heat pump of gaseous pressure boost in top of the tower, directly compress the top of the tower steam with the compressor, improved the pressure and the temperature of top of the tower steam by a wide margin, reuse top of the tower steam after the pressure boost directly to the reboiler heat supply at the bottom of the rectifying column tower, thereby reached and realized the purpose of practicing thrift the energy consumption with lower cost; through estimation, compared with the existing rectification process, the process of the utility model can reduce the energy consumption by 60-80%, and has obvious energy-saving effect.
Claims (3)
1. A compression heat pump rectification system for acetic acid concentration comprises a rectification tower, a tower bottom reboiler and a reflux tank; the top of the rectifying tower is provided with a gas phase outlet and a reflux port, the middle of the rectifying tower is provided with a raw material inlet, and the bottom of the rectifying tower is provided with a liquid outlet and a liquid inlet; the compression type heat pump rectification system for acetic acid concentration is characterized by comprising a compressor, wherein the compressor is arranged at the top of a rectification tower, and an inlet of the compressor is communicated with a gas-phase outlet of the rectification tower;
a hot end inlet of the tower bottom reboiler is communicated with an outlet of the compressor, and a hot end outlet of the tower bottom reboiler is communicated with an inlet of the reflux tank; a cold end inlet of the tower bottom reboiler is communicated with a liquid outlet of the rectifying tower, and a cold end outlet of the tower bottom reboiler is communicated with a liquid inlet of the rectifying tower;
the reflux tank is communicated with a reflux port of the rectifying tower, and is used for discharging a part of liquid as a tower top product from the reflux tank, and returning the other part of liquid as reflux to the rectifying tower;
the compression type heat pump rectification system for acetic acid concentration comprises a first regulating valve, a second regulating valve, a first pressure transmitter, a second pressure transmitter and a controller;
an inlet of the first regulating valve and an inlet of the second regulating valve are respectively communicated with a water vapor pipeline, an outlet of the first regulating valve is communicated with an inlet of the compressor, and an outlet of the second regulating valve is communicated with an outlet of the compressor;
the first pressure transmitter is used for detecting the inlet pressure of the compressor, and the second pressure transmitter is used for detecting the outlet pressure of the compressor;
the controller is used for receiving valve state signals fed back by the first regulating valve and the second regulating valve and detection results sent by the first pressure transmitter and the second pressure transmitter, and controlling the opening degree of the first regulating valve and the second regulating valve so as to regulate the flow of the water vapor flowing into the inlet and the outlet of the compressor and maintain the inlet pressure and the outlet pressure of the compressor stable.
2. A compression heat pump rectification system for acetic acid concentration as claimed in claim 1 wherein the compressor is a screw compressor.
3. A compression heat pump rectification system for acetic acid concentration as recited in claim 1 wherein the rectification column is a plate column or a packed column.
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| CN201921707449.6U CN211836379U (en) | 2019-10-12 | 2019-10-12 | Compression type heat pump rectification system for acetic acid concentration |
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| CN201921707449.6U CN211836379U (en) | 2019-10-12 | 2019-10-12 | Compression type heat pump rectification system for acetic acid concentration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113457195A (en) * | 2021-08-09 | 2021-10-01 | 项文远 | High energy-saving hypergravity heat pump rectification equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113457195A (en) * | 2021-08-09 | 2021-10-01 | 项文远 | High energy-saving hypergravity heat pump rectification equipment |
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