CN221309571U - Heating system based on acetic acid recovery rectifying tower waste heat - Google Patents
Heating system based on acetic acid recovery rectifying tower waste heat Download PDFInfo
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- CN221309571U CN221309571U CN202323185698.2U CN202323185698U CN221309571U CN 221309571 U CN221309571 U CN 221309571U CN 202323185698 U CN202323185698 U CN 202323185698U CN 221309571 U CN221309571 U CN 221309571U
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- heat
- rectifying tower
- heat pump
- absorption type
- steam
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 238000010438 heat treatment Methods 0.000 title claims abstract description 33
- 238000011084 recovery Methods 0.000 title claims abstract description 28
- 239000002918 waste heat Substances 0.000 title claims abstract description 19
- 238000010521 absorption reaction Methods 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims description 23
- 238000010992 reflux Methods 0.000 claims description 12
- 238000009835 boiling Methods 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 238000009834 vaporization Methods 0.000 claims description 4
- 230000008016 vaporization Effects 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims 1
- 239000008236 heating water Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 23
- 238000009833 condensation Methods 0.000 abstract description 11
- 230000005494 condensation Effects 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000004821 distillation Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 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
- 238000004891 communication Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model discloses a heating system based on acetic acid recovery rectifying tower waste heat, wherein an energy-saving condenser is additionally arranged at the top gas position of the rectifying tower to exchange hot water and enter a second type of absorption heat pump, or the top gas of the rectifying tower is directly fed into the second type of absorption heat pump to realize condensation of the top gas, and meanwhile, low-pressure steam of 0-0.2MPaG can be prepared or materials can be directly heated for production and use. By utilizing the heat energy recovery and energy saving scheme, low-pressure steam consumption can be saved, and meanwhile, the consumption of circulating water is saved by 30-50%, so that the heat energy recovery and energy saving scheme has the remarkable characteristics of energy conservation and water conservation.
Description
Technical Field
The utility model relates to the technical field of acetic acid recovery, in particular to a heating system based on 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 dilute acetic acid (tower bottom liquid) in the rectifying tower is heated by utilizing steam, the steam at the top of the rectifying tower is condensed by a condensing device (circulating water is used as a cooling medium), and the 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 method, the utility model provides a heating system based on acetic acid recovery rectifying tower waste heat, so that the latent heat of condensation of the tower top 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:
A heating system based on acetic acid recovery rectifying tower waste heat, comprising: the energy-saving condenser is provided with a heat exchange reflux chamber which is filled with water medium, 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 type heat pump through hot water to serve as driving power, the heat exchange reflux chamber is communicated with a driving liquid inlet end of the absorption type heat pump, a driving liquid outlet end of the absorption type heat pump is communicated with a circulating water pipeline to carry out water medium reflux, and the absorption type heat pump is used for preparing low-pressure steam and delivering or directly removing heating materials.
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 material input pipeline and a material output pipeline, wherein the material input pipeline is connected with the input end of the absorption type II heat pump so that materials enter the absorption type II heat pump and are heated by the low boiling point vaporization principle under high vacuum, and the output end of the absorption type II heat pump is connected with the material output pipeline so as to output the heated materials.
The utility model also provides another heating system based on acetic acid recovery rectifying tower waste heat, which comprises: the top of the rectifying tower is respectively communicated with the steam inlet end of the absorption type II heat pump 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 type II heat pump 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 the second-type absorption heat pump, or the top gas of the rectifying tower is directly entered into the second-type absorption heat pump to realize the condensation of the top gas, and meanwhile, low-pressure steam of 0-0.2MPaG can be prepared or materials can be directly heated for production and use, the condensation latent heat of the top steam is fully utilized, and a good energy-saving effect is realized.
Drawings
Fig. 1 is a schematic diagram of a heating system according to an embodiment of the utility model.
Fig. 2 is a schematic diagram of a heating 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 main distillation tower to exchange hot water and enter the second-class absorption heat pump, or the top gas of the main distillation tower is directly entered into the second-class absorption heat pump, so that the condensation of the top gas of the main distillation tower is realized, and meanwhile, low-pressure steam of 0-0.2MPaG can be prepared or materials can be directly heated for production. By utilizing the heat energy recovery and energy saving scheme, low-pressure steam consumption can be saved, and meanwhile, the consumption of circulating water is saved by 30-50%, so that the heat energy recovery and energy saving scheme has the remarkable characteristics of energy conservation and water conservation.
For example, a heating system based on acetic acid recovery rectifying tower waste heat, comprising: reboiler 1, rectifying column 2 (main steam tower), energy-conserving condenser 3 and absorption type class II heat pump 5, the upper end of rectifying column through the pipeline with the inside of energy-conserving condenser communicates with each other, the lower extreme of rectifying column is through the pipeline connection have the reboiler, the reboiler is in through pipeline fixed connection 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 extracted by the energy-saving condenser in a heat exchange mode and then is transmitted to the absorption type II heat pump through hot water to serve as driving power, the heat exchange reflux chamber is communicated with a driving liquid inlet end of the absorption type II heat pump, a driving liquid outlet end of the absorption type II heat pump is communicated with a circulating water pipeline to carry out water medium reflux, and the absorption type II heat pump is used for preparing low-pressure steam and sending out or directly heating materials.
In the embodiment, the gas phase at the top of the rectifying tower enters an energy-saving condenser at first, exothermic condensation is carried out as condensate, heat energy is extracted and then is transmitted to an absorption type II heat pump through hot water to be used as driving, the absorption type II heat pump utilizes the principle that water is vaporized under high vacuum and low boiling point to prepare low-pressure steam to be carried out or directly heat materials for use in a heat utilization place, and circulating water of the cooling tower is connected to the absorption type II heat pump for adjusting when the heat is partially taken away and partially condensed during heating.
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 heating system further comprises a temperature management module, the heat exchange backflow chamber is communicated with the driving liquid inlet end of the absorption type two-class heat pump 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 connection of the absorption type two-class heat pump 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 the driving liquid inlet end of the absorption type two-class heat pump is insufficient to meet the operation of the absorption type two-class heat pump, and at the moment, the absorption type two-class heat pump is connected with the external power supply. When the temperature collected by the temperature sensor is greater than or equal to a threshold value, the heat energy converted from the hot water entering the driving liquid inlet end of the absorption type II heat pump can meet the operation of the absorption type II heat pump, and at the moment, the absorption type II heat pump is disconnected from an external power supply. The intelligent management is realized through the temperature management module.
The system also includes a make-up tank (not shown) in communication with the heat exchange return chamber via a conduit for replenishing water, the conduit also having a pump for providing water flow power.
The system also comprises a material input pipeline and a material output pipeline, wherein the material input pipeline is connected with the input end of the absorption type II heat pump so that materials enter the absorption type II heat pump and are heated by the low boiling point vaporization principle under high vacuum, and the output end of the absorption type II heat pump is connected with the material output pipeline so as to output the heated materials.
The operation mode of the utility model consists of two parts of heat: the condensing heat of the top gas is divided into two parts, one part is used for preparing high-grade heat energy such as low-pressure steam and the like, the other part is taken away by circulating water, steam or other heat sources are required to be input into the original production heating, the original top gas circulation is cooled by the circulating water, part of the steam energy or other energy sources is replaced by the condensing heat of the top gas, and meanwhile, the circulating water consumption for condensing the top gas is saved by 30-50%.
Referring to fig. 2, another embodiment provided by the present utility model: the tower top gas of the acetic acid recovery rectifying tower directly enters an absorption type II heat pump to be driven, the exothermic condensation is carried out as condensate, and the absorption type II heat pump utilizes the principle of low boiling point vaporization of water under high vacuum to prepare low-pressure steam to be carried out or directly heat materials for use in a heat application place. The material may be a water source.
For example, a heating system based on acetic acid recovery rectifying tower waste heat, comprising: reboiler 1, rectifying column 2, condenser 6 and absorption type class II heat pump 5, rectifying column top is linked together with the admission end and the condenser of absorption type class II heat pump respectively through the pipeline, and rectifying column top is partly steam and is got into the condenser by first steam pipe, and another part steam is linked together with the admission end of absorption type class II heat pump through the second steam pipe, is equipped with the check valve (not shown in the figure) on the second steam pipe. The material inlet of the absorption type II heat pump exchanges waste heat with the material, and the material outlet of the absorption type II heat pump is used for preparing low-pressure steam of 0-0.2MPaG or directly heating the material for production and use. 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 acetic acid recovery rectifying tower directly enters an absorption type II heat pump to be driven, exothermic condensation is carried out as condensate, the absorption type II heat pump utilizes the principle that water is vaporized under high vacuum and low boiling point to prepare low-pressure steam to be carried out or directly heat materials for use in a heating place, and circulating water of the cooling tower is connected to the absorption type II heat pump and an original condenser for partially taking away heat during heating and adjusting during partial condensation. The operation mode consists of two parts of heat: the condensing heat of the top gas is divided into two parts, one part is used for preparing high-grade heat energy such as low-pressure steam and the like, the other part is taken away by circulating water, steam or other heat sources are required to be input into the original production heating, the original top gas circulation is cooled by the circulating water, part of the steam energy or other energy sources is replaced by the condensing heat of the top gas, and meanwhile, the circulating water consumption for condensing the top gas is saved by 30-50%.
The heating 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 connection of the absorption type II heat pump and an external power supply according to comparison of the temperature value and the threshold value, and when the collected temperature is smaller than the threshold value, namely, the heat energy converted from hot water entering a driving liquid inlet end of the absorption type II heat pump is insufficient to meet the operation of the absorption type II heat pump, and at the moment, the absorption type II heat pump is connected with the external power supply. When the temperature collected by the temperature sensor is greater than or equal to a threshold value, the heat energy converted from the hot water entering the driving liquid inlet end of the absorption type II heat pump can meet the operation of the absorption type II heat pump, and at the moment, the absorption type II heat pump 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. The utility model provides a heating system based on acetic acid recovery rectifying column waste heat which characterized in that includes: the energy-saving condenser is provided with a heat exchange reflux chamber filled with water medium, the heat exchange reflux chamber is communicated with a driving liquid inlet end of the absorption type II heat pump, a driving liquid outlet end of the absorption type II heat pump is communicated with a circulating water pipeline for carrying out water medium reflux, the absorption type II heat pump is used for preparing low-pressure steam and sending or directly removing heating materials, and steam heat energy of the rectification tower is transmitted to the absorption type II heat pump as driving power through hot water after the energy-saving condenser extracts heating water medium in a heat exchange mode.
2. The heating system based on the waste heat of the acetic acid recovery rectifying tower according to claim 1, further comprising a secondary condenser, wherein the secondary condenser is communicated with an output end of the energy-saving condenser through a pipe to secondarily condense the remaining steam.
3. The heating system based on the waste heat of the acetic acid recovery rectifying tower according to claim 1, further comprising a water supplementing tank, wherein the water supplementing tank is communicated with the heat exchange reflux chamber through a pipeline.
4. The heating system based on the waste heat of the acetic acid recovery rectifying tower according to claim 1, wherein the reboiler is fixedly connected to the left side of the rectifying tower through a pipeline.
5. The heating system based on the waste heat of the acetic acid recovery rectifying tower 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 heating system based on the waste heat of the acetic acid recovery rectifying tower according to claim 1, further comprising a material input pipeline and a material output pipeline, wherein the material input pipeline is connected with the input end of the absorption type two-class heat pump so that the material enters the absorption type two-class heat pump and is heated by the principle of low boiling point vaporization under high vacuum, and the output end of the absorption type two-class heat pump is connected with the material output pipeline so as to output the heated material.
7. The utility model provides a heating system based on acetic acid recovery rectifying column waste heat which characterized in that includes: the top of the rectifying tower is respectively communicated with the steam inlet end of the absorption type II heat pump 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 type II heat pump through a second steam pipe.
8. The heating system based on the waste heat of the acetic acid recovery rectifying tower according to claim 7, wherein a one-way valve is arranged on the second steam pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323185698.2U CN221309571U (en) | 2023-11-23 | 2023-11-23 | Heating system based on acetic acid recovery rectifying tower waste heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323185698.2U CN221309571U (en) | 2023-11-23 | 2023-11-23 | Heating system based on acetic acid recovery rectifying tower waste heat |
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| Publication Number | Publication Date |
|---|---|
| CN221309571U true CN221309571U (en) | 2024-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323185698.2U Active CN221309571U (en) | 2023-11-23 | 2023-11-23 | Heating system based on acetic acid recovery rectifying tower waste heat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221309571U (en) |
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- 2023-11-23 CN CN202323185698.2U patent/CN221309571U/en active Active
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