CN221267181U - Acetic acid recovery rectifying column waste heat refrigerating system - Google Patents
Acetic acid recovery rectifying column waste heat refrigerating system Download PDFInfo
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- CN221267181U CN221267181U CN202323169236.1U CN202323169236U CN221267181U CN 221267181 U CN221267181 U CN 221267181U CN 202323169236 U CN202323169236 U CN 202323169236U CN 221267181 U CN221267181 U CN 221267181U
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- water
- acetic acid
- waste heat
- energy
- acid recovery
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 238000011084 recovery Methods 0.000 title claims abstract description 25
- 239000002918 waste heat Substances 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000010521 absorption reaction Methods 0.000 claims abstract description 59
- 238000005057 refrigeration Methods 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 25
- 238000010992 reflux Methods 0.000 claims description 13
- 238000009835 boiling Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 238000009834 vaporization Methods 0.000 claims description 3
- 230000008016 vaporization Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 20
- 238000009833 condensation Methods 0.000 abstract description 15
- 230000005494 condensation Effects 0.000 abstract description 15
- 238000001816 cooling Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Abstract
The utility model discloses an acetic acid recovery rectifying tower waste heat refrigerating system, wherein an energy-saving condenser is additionally arranged at the top gas position of the rectifying tower to exchange hot water and enter an absorption refrigerating unit, or the top gas of the rectifying tower is directly entered into the absorption refrigerating unit to realize condensation of the top gas, and low-temperature chilled water is prepared for workshops or other cold fields. The device can replace an original workshop electric refrigerating unit or other cooling modes, completely saves the electricity consumption of the original electric refrigerating unit, and has obvious energy-saving effect.
Description
Technical Field
The utility model relates to the technical field of acetic acid recovery, in particular to a chilled water preparation system by using waste heat of an acetic acid recovery rectifying tower.
Background
The acetic acid recovering and rectifying tower is one device for purifying and recovering dilute acetic acid solution produced in chemical production process. When the acetic acid recovery rectifying tower works, the steam is utilized to heat dilute acetic acid (tower bottom liquid) in the rectifying tower, the gas phase at the top of the rectifying tower is condensed by a condensing device (circulating water is used as a cooling medium), and hot acid at the tower bottom is condensed into acetic acid liquid by the condensing device (circulating cooling water) so as to be recovered. The original control mode of steam flow is: the flow rate of the steam is controlled according to a certain temperature or pressure point (generally the temperature of the tower bottom liquid and the temperature in the tower) of the tower bottom. However, the main problems of the acetic acid recovery rectifying tower in the prior art are: the heat source of the top steam of the rectifying tower and the heat source of the tower bottom are not fully used, so that the consumption of circulating water is large. Therefore, there is a need for improved techniques for recovering the overhead vapors of the rectifying column and the heat of the column bottoms. This reduces the overhead vapor cooled cycle water consumption.
The original technology is as follows: the rectifying tower adopts steam to enter a reboiler for heating, the tower top gas condenser is cooled by circulating water, and part of heat energy is not recycled, so that the condensation latent heat of the tower top steam is wasted, and the circulating water is consumed. The temperature of the overhead is about 80 ℃, the temperature level is low, the temperature difference of waste heat recovery and utilization is small, and the recovery is difficult, but the flow of the overhead is large, the overhead is gas phase distillation, and a large amount of latent heat cannot be effectively utilized. If the latent heat of condensation of the vapor at the top of the tower can be fully utilized, rather than the direct adoption of circulating water cooling at present, a good energy-saving effect can be realized.
Disclosure of utility model
Based on the above, the utility model provides an acetic acid recovery rectifying tower waste heat refrigerating system, so that the latent heat of condensation of the overhead vapor is fully utilized, and a good energy-saving effect is realized.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
An acetic acid recovery rectifying column waste heat refrigeration system, comprising: the energy-saving condenser is provided with a heat exchange reflux chamber filled with water medium, the steam heat energy of the rectifying tower is extracted by the energy-saving condenser in a heat exchange mode and then is transmitted to the absorption refrigeration unit through hot water to serve as driving power, the heat exchange reflux chamber is communicated with a driving liquid inlet end of the absorption refrigeration unit, a driving liquid outlet end of the absorption refrigeration unit is communicated with a circulating water pipe to carry out water medium reflux, and the absorption refrigeration unit is used for refrigerating a water source.
Optionally, the energy-saving steam condenser further comprises a secondary condenser, wherein the secondary condenser is communicated with the output end of the energy-saving condenser through a pipeline so as to secondarily condense residual steam.
Optionally, the heat exchange reflux device further comprises a water supplementing tank, wherein the water supplementing tank is communicated with the heat exchange reflux chamber through a pipeline.
Optionally, the reboiler is fixedly connected to the left side of the rectifying tower through a pipeline.
Optionally, the energy-saving condenser and the secondary condenser are both provided with liquid outlets, and the liquid outlets are connected with the top inlet of the collecting tank through liquid outlets.
Optionally, the system further comprises a water pipeline and a water outlet pipeline, wherein the water pipeline is connected with the input end of the absorption refrigeration unit so that water enters the absorption refrigeration unit and is cooled by the low boiling point vaporization principle under high vacuum, and the output end of the absorption refrigeration unit is connected with the water outlet pipeline so as to output low-temperature cold water.
The utility model also provides another acetic acid recovery rectifying tower waste heat refrigerating system, which comprises: the top of the rectifying tower is respectively communicated with the steam inlet end of the absorption refrigerating unit and the condenser through pipelines, one part of steam at the top of the rectifying tower enters the condenser through a first steam pipe, and the other part of steam is communicated with the steam inlet end of the absorption refrigerating unit through a second steam pipe.
Optionally, a one-way valve is arranged on the second steam pipe.
The utility model has the beneficial effects that: an energy-saving condenser is additionally arranged at the top gas position of the rectifying tower to exchange hot water and enter an absorption refrigerating unit or the top steam of the rectifying tower directly enters the absorption refrigerating unit to be used as driving, so that the condensation latent heat of the top steam is fully utilized, and a good energy-saving effect is realized. The absorption refrigerating unit can generate low-temperature cold water with adjustable temperature of 5-25 ℃ for workshops or other cold-field uses.
Drawings
Fig. 1 is a schematic diagram of an acetic acid recovery rectifying tower waste heat refrigeration system according to an embodiment of the utility model.
Fig. 2 is a schematic diagram of an acetic acid recovery rectifying tower waste heat refrigeration system according to another embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, one embodiment provided by the present utility model: an energy-saving condenser is additionally arranged at the top gas position of the rectifying tower to exchange hot water and enter an absorption refrigerating unit, so that the top gas is condensed, and meanwhile, low-temperature cold water with adjustable temperature of 5-25 ℃ can be produced for workshops or other cold-field use. The heat energy recovery and energy saving scheme is used for replacing an original workshop electric refrigerating unit or other cooling modes, so that the electricity consumption of the original electric refrigerating unit or the energy consumption of other cooling modes are completely saved, and the energy saving effect is remarkable. The load adjusting range is wide, the load adjusting range is stepless and adjustable between 20 and 100 percent, and the original process is not influenced.
Referring to fig. 1, for example, an acetic acid recovery rectifying tower waste heat refrigeration system includes: reboiler 1, rectifying column 2 (main steam tower), energy-conserving condenser 3 and absorption refrigerating unit 5, the upper end of rectifying column pass through the pipeline with the inside of energy-conserving condenser communicates with each other, the lower extreme of rectifying column is connected with through the pipeline the reboiler, the reboiler passes through pipeline fixed connection and is in rectifying column left side. The energy-saving condenser is provided with a heat exchange reflux chamber filled with water medium, steam heat energy of the rectifying tower is transmitted to the absorption refrigerating unit through hot water after the energy-saving condenser extracts the heated water medium in a heat exchange mode to serve as driving power, the heat exchange reflux chamber is communicated with a driving liquid inlet end of the absorption refrigerating unit, a driving liquid outlet end of the absorption refrigerating unit is communicated with a circulating water pipeline to carry out water medium reflux, the absorption refrigerating unit is used for refrigerating water, and the refrigerated water can be used in workshops or other cold places.
In the embodiment, the top gas of the rectifying tower enters an energy-saving condenser, exothermic condensation is carried out as condensate, heat energy is extracted and then is transmitted to an absorption refrigerating unit through hot water to be used as driving, and the absorption refrigerating unit utilizes the principle that water is vaporized under high vacuum and low boiling point to prepare low-temperature cold water to be carried out for workshops or other cold places; the circulating water of the cooling tower is connected to an absorption refrigerating unit and used for regulating when refrigerating and taking away heat and partially condensing.
In order to further condense the top gas of the rectifying tower, the system further comprises a secondary condenser 4 which is communicated with the output end of the energy-saving condenser through a pipeline so as to secondarily condense the residual steam. The energy-saving condenser and the secondary condenser are respectively provided with a liquid outlet, and the liquid outlet is connected with the top inlet of the collecting tank through a liquid outlet pipe. The collecting tank is used for collecting condensate.
The refrigerating system further comprises a temperature management module, the heat exchange reflux chamber is communicated with the driving liquid inlet end of the absorption refrigerating unit through a heating pipeline, a temperature sensor is arranged in the heating pipeline, the temperature sensor transmits the collected temperature to the temperature management module, the temperature management module controls the connection of the absorption refrigerating unit and an external power supply according to comparison of a temperature value and a threshold value, and when the collected temperature is smaller than the threshold value, the heat energy of hot water conversion of the driving liquid inlet end of the absorption refrigerating unit is insufficient to meet the operation of the absorption refrigerating unit, and at the moment, the temperature management module controls the absorption refrigerating unit to be connected with the external power supply. When the temperature sensor is used for acquiring the temperature which is greater than or equal to the threshold value, namely, the heat energy converted from the hot water entering the driving liquid inlet end of the absorption refrigerating unit can meet the operation requirement of the absorption refrigerating unit, and at the moment, the temperature management module controls the absorption refrigerating unit to be disconnected from an external power supply. The intelligent management is realized through the temperature management module.
The system further includes a make-up tank in communication with the heat exchange return chamber through a conduit to make-up water.
The system also comprises a water pipeline and a water outlet pipeline, wherein the water pipeline is connected with the input end of the absorption refrigerating unit so that drinking water enters the absorption refrigerating unit and is cooled by the low-boiling point vaporization principle under high vacuum, and the output end of the absorption refrigerating unit is connected with the water outlet pipeline so as to output low-temperature cold water.
The operation mode of the refrigerating system of the utility model consists of three parts of heat: part of the heat is the condensation heat of the tower top gas, part of the heat is the cooling heat energy of cold water, part of the heat energy is taken away by circulating water cooling, and the condensation heat of the tower top gas and the cooling heat energy of the cold water are finally taken away by the circulating water; the original refrigeration mode needs to input a large amount of electric energy or other energy sources, the condensation heat of the tower top gas replaces the electric energy or other energy sources, and the other modes are unchanged, so that a large amount of energy sources are saved.
Referring to fig. 2, another embodiment provided by the present utility model: the tower top gas of the rectifying tower is directly fed into an absorption refrigerating unit to realize the condensation of the tower top gas, and simultaneously, low-temperature cold water with adjustable temperature of 5-25 ℃ can be produced for workshops or other cold spots.
As shown in fig. 2, for example, an acetic acid recovery rectifying tower waste heat refrigeration system includes: reboiler 1, rectifying column 2, condenser 6 and absorption refrigeration unit 5, rectifying column top are linked together with absorption refrigeration unit's admission end and condenser respectively through the pipeline, and rectifying column top part steam gets into the condenser by first steam pipe, and another part steam is linked together with absorption refrigeration unit's admission end through the second steam pipe, is equipped with the check valve on the second steam pipe (not shown in the figure). The liquid inlet of the absorption refrigerating unit can be communicated with a water source through a water pipe, waste heat exchange is carried out through the water source, and the liquid outlet of the absorption refrigerating unit is used for workshops or other cold spots. After transformation, the steam consumption is reduced, thereby not only meeting the production requirement, but also achieving the purpose of energy saving.
Specifically, the top gas of the rectifying tower directly enters an absorption refrigerating unit to be driven, exothermic condensation is carried out as condensate, the absorption refrigerating unit utilizes the principle that water is vaporized under high vacuum and low boiling point to prepare low-temperature cold water to be carried out, and circulating water of the cooling tower is connected to the absorption refrigerating unit for refrigerating, taking heat and adjusting during partial condensation. The operation mode consists of three parts of heat: part of the heat is the condensation heat of the tower top gas, part of the heat is the cooling heat energy of cold water, part of the heat energy is taken away by circulating water, the condensation heat of the tower top gas and the cooling heat energy of the cold water are finally taken away by the circulating water, a large amount of electric energy or other energy sources need to be input in an original refrigeration mode, the condensation heat of the tower top gas replaces the electric energy or other energy sources, and other modes are unchanged, so that a large amount of energy consumption is saved.
The refrigerating system further comprises a temperature management module, a temperature sensor is arranged in the second steam pipe, the temperature sensor transmits the collected temperature to the temperature management module, the temperature management module controls the connection of the absorption refrigerating unit and an external power supply according to comparison of a temperature value and a threshold value, and when the collected temperature is smaller than the threshold value, the heat energy converted from hot water entering a driving liquid inlet end of the absorption refrigerating unit is insufficient to meet the operation of the absorption refrigerating unit, and at the moment, the absorption refrigerating unit is connected with the external power supply. When the temperature sensor is used for acquiring the temperature which is greater than or equal to the threshold value, the heat energy converted from the hot water entering the driving liquid inlet end of the absorption refrigerating unit can meet the operation requirement of the absorption refrigerating unit, and at the moment, the absorption refrigerating unit is disconnected from an external power supply. The intelligent management is realized through the temperature management module. The second steam pipe is also provided with a flow regulating valve to control the steam flow.
The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (8)
1. An acetic acid recovery rectifying column waste heat refrigerating system, which is characterized by comprising: the energy-saving condenser is provided with a heat exchange reflux chamber filled with water medium, the steam heat energy of the rectifying tower is extracted by the energy-saving condenser in a heat exchange mode and then is transmitted to the absorption refrigeration unit through hot water to serve as driving power, the heat exchange reflux chamber is communicated with a driving liquid inlet end of the absorption refrigeration unit, a driving liquid outlet end of the absorption refrigeration unit is communicated with a circulating water pipe to carry out water medium reflux, and the absorption refrigeration unit is used for refrigerating a water source.
2. The acetic acid recovery rectifier waste heat refrigeration system of claim 1, further comprising a secondary condenser in communication with an output of the energy-saving condenser through a conduit to secondarily condense remaining steam.
3. The acetic acid recovery rectifying column waste heat refrigeration system of claim 1, further comprising a water replenishment tank in communication with said heat exchange reflux chamber through a conduit.
4. The acetic acid recovery rectifying column waste heat refrigeration system according to claim 1, wherein said reboiler is fixedly connected to the left side of said rectifying column through a pipe.
5. The acetic acid recovery rectifying column waste heat refrigerating system according to claim 2, wherein the energy-saving condenser and the secondary condenser are respectively provided with a liquid outlet, and the liquid outlet is connected with the top inlet of the collecting tank through a liquid outlet pipe.
6. The acetic acid recovery rectifying column waste heat refrigeration system according to claim 1, further comprising a water pipeline and a water outlet pipeline, wherein the water pipeline is connected with an input end of the absorption refrigeration unit so as to enable water to enter the absorption refrigeration unit and cool down by a low boiling point vaporization principle under high vacuum, and an output end of the absorption refrigeration unit is connected with the water outlet pipeline so as to output low-temperature cold water.
7. An acetic acid recovery rectifying column waste heat refrigerating system, which is characterized by comprising: the top of the rectifying tower is respectively communicated with the steam inlet end of the absorption refrigerating unit and the condenser through pipelines, one part of steam at the top of the rectifying tower enters the condenser through a first steam pipe, and the other part of steam is communicated with the steam inlet end of the absorption refrigerating unit through a second steam pipe.
8. The acetic acid recovery rectifying column waste heat refrigeration system as recited in claim 7 wherein said second vapor tube is provided with a one-way valve.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221267181U true CN221267181U (en) | 2024-07-05 |
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