CN219217609U - Heat recovery device of reclaimed water stripping tower in butanol-octanol device - Google Patents
Heat recovery device of reclaimed water stripping tower in butanol-octanol device Download PDFInfo
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- CN219217609U CN219217609U CN202223012288.3U CN202223012288U CN219217609U CN 219217609 U CN219217609 U CN 219217609U CN 202223012288 U CN202223012288 U CN 202223012288U CN 219217609 U CN219217609 U CN 219217609U
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Abstract
The utility model discloses a heat recovery device of a water stripper in a butanol-octanol device, which comprises a water stripper and is characterized in that the device comprises a tower bottom heat exchanger, waste water to be treated is connected to the tower bottom heat exchanger, and enters the water stripper from the upper part of the tower after exchanging heat with the discharged material at the tower bottom of the water stripper. The heat recovery device of the water stripper in the butanol-octanol device realizes heat exchange between the feeding of the water stripper and the discharging of the tower kettle, effectively utilizes the waste heat resources of the materials in the tower kettle of the water stripper, improves the feeding temperature, and reduces the discharging temperature of the tower kettle, thereby reducing the consumption of stripping steam and cooling water of a cooler.
Description
Technical Field
The utility model belongs to the technical field of butanol and octanol production, and particularly relates to a heat recovery device of a water stripping tower in a butanol and octanol device.
Background
Butanol (butyl alcohol) and octanol (isooctanol is commonly known as octanol; 2-ethylhexanol) are typically produced in the same set of equipment by OXO (OXO) processes, and are therefore commonly known as butanol. Butanol octanol is an important raw material for synthesizing fine chemical products, and is mainly used for producing plasticizers, solvents, dehydrating agents, defoamers, dispersants, flotation agents, petroleum additives, synthetic fragrances and the like.
Butyl octanol adopts propylene and synthesis gas as raw materials, and mixed butyraldehyde (n-butyraldehyde and isobutyraldehyde) is produced through a low-pressure oxo synthesis method; feeding the mixed butyraldehyde into a butyraldehyde hydrogenation system to produce mixed crude butanol (n-butanol and isobutanol), and separating isomers to obtain n-butanol and isobutanol; condensing n-butyraldehyde to obtain octenal, and hydrogenating to produce octanol. The intermediate products comprise n-butyl aldehyde, isobutyl aldehyde and octenal (EPA), and the products are n-butyl alcohol, isobutyl alcohol and octanol.
In the butanol-octanol device, waste water generated by a condensation system, an aldehyde isomerization system, a vacuum system, a rectification system and the like is required to be fed into a water stripping system for stripping treatment. During the device start-up, the temperature of wastewater entering a water stripping system is lower, a large amount of low-pressure steam (LLPS) is required to be introduced for heating the wastewater so as to realize the stripping, the outlet temperature at the bottom of the stripping tower is higher after the stripping is heated, the temperature is required to be reduced by a cooler and then is discharged to a subsequent water treatment unit, the process causes a large amount of water vapor consumption, the running cost is increased, meanwhile, the fluctuation of the operating condition of the stripping tower is caused due to the pressure and flow fluctuation of a steam system, the risk of exceeding the standard of COD discharged from the wastewater is brought, and the safety and environmental protection risks are higher.
Disclosure of Invention
The utility model aims to provide a heat recovery device of a water stripper in a butanol-octanol device, which can solve the problems that a large amount of steam and cooling water are consumed by heating and cooling materials of the water stripper, the heat utilization efficiency is low and the like, improve unstable stripping operation caused by steam pressure and flow fluctuation, and reduce the risk of exceeding the COD (chemical oxygen demand) of discharged wastewater.
In order to achieve the aim of the utility model, the utility model adopts the following technical scheme:
the utility model provides a heat recovery unit of water stripper in butanol and octanol device, includes water stripper, its characterized in that, the device still include the heat exchanger at the bottom of the tower, wait to handle waste water and be connected to the heat exchanger at the bottom of the tower, with water stripper bottom of the tower ejection of compact heat transfer back, get into water stripper from the tower upper portion.
Further, in the device, steam enters the water stripping tower from the lower part of the tower, and the flow of the steam is regulated by a steam flow regulating valve.
Further, the water stripping tower is a vertical packed tower.
Further, the packing of the water stripping tower is pall rings.
Further, the bottom heat exchanger is a shell-and-tube heat exchanger, the wastewater passes through a tube pass, and the materials at the bottom of the water stripping tower pass through a shell pass.
The beneficial effects are that: the heat recovery device of the water stripper in the butanol-octanol device realizes heat exchange between the feeding of the water stripper and the discharging of the tower kettle, effectively utilizes the waste heat resources of the materials in the tower kettle of the water stripper, improves the feeding temperature, and reduces the discharging temperature of the tower kettle, thereby reducing the consumption of stripping steam and the consumption of cooling water of a cooler. Meanwhile, the risk of exceeding the standard of COD discharged by the sewage caused by pressure and flow fluctuation of the steam system is reduced, the problem of exceeding the standard of the sewage is solved, and the device can safely and stably run for a long period. The device improves the energy recycling efficiency in the operation process of the butanol-octanol device, reduces the energy consumption in the production process of octanol, isobutyraldehyde and other products, and has obvious economic benefit and environmental protection benefit.
Drawings
FIG. 1 is a schematic structural view of a heat recovery device of a water stripper in a butanol-octanol device of this utility model;
wherein 1 is a water stripping tower; 2 is a steam flow regulating valve; 3 is a tower bottom heat exchanger, V-1 is an original wastewater feed valve, V-2 is a cooling water return valve, V-3 is a cooling water inlet valve, V-4 is a wastewater inlet valve, V-5 is a wastewater return valve, V-6 is a front wastewater feed valve, and V-7 is a rear wastewater feed valve.
Detailed Description
The following detailed description of the present utility model is given by way of specific examples, which are given for illustrative purposes only and are not to be construed as limiting the scope of the present utility model.
Referring to fig. 1, in an original device, a water stripping tower 1 is arranged, each low-temperature sewage branch in a butanol-octanol device enters the water stripping tower 1 from the upper part of the tower through a pipeline by an original wastewater feeding valve V-1, a steam flow regulating valve 2 is opened at the lower part of the tower, low-pressure steam (LLPS) is introduced into the water stripping tower 1, a large amount of LLPS is used for heating and stripping wastewater, gas phase materials after stripping are extracted from the top outlet of the water stripping tower 1, and wastewater with higher temperature after bottom stripping is cooled by cooling water and is discharged to a downstream sewage treatment device. The consumption of cooling water and steam required in the operation is larger, and the sewage COD is easy to exceed the standard because the pressure and the flow of the steam system fluctuate.
Fig. 1 is a schematic structural diagram of a heat recovery device of a water stripper in a butanol-octanol device, which comprises a water stripper 1 and a bottom heat exchanger 3, wherein two pipelines are arranged at the upstream and downstream of an original wastewater feed valve V-1, an upstream pipeline is connected with the downstream of a cooling water feed valve V-3 of the bottom heat exchanger 3, a front wastewater feed valve V-6 and a wastewater feed valve V-4 are arranged on the pipelines, a downstream pipeline is connected with the upstream of a cooling water return valve V-2 of the bottom heat exchanger 3, a wastewater return valve V-5 and a rear wastewater feed valve V-7 are arranged on the pipelines, wastewater to be treated is connected to the bottom heat exchanger 3, and enters the water stripper 1 from the upper part of the tower after heat exchange with the discharged material at the bottom of the water stripper 1. Steam enters the water stripping tower 1 from the lower part of the tower, and the flow of the steam is regulated by a steam flow regulating valve 2. V-1-V-7 are gate valves.
The water stripping tower 1 is a vertical packed tower, and the packing in the tower is pall rings.
The tower kettle of the water stripping tower 1 is provided with a liquid level meter.
The bottom heat exchanger 3 adopts a shell-and-tube heat exchanger, the waste water passes through a tube pass, and the bottom material of the water stripping tower 1 passes through a shell pass.
According to the heat recovery device of the water stripper in the butanol-octanol device, an original wastewater feed valve V-1, a cooling water return valve V-2 and a cooling water feed valve V-3 of a tower bottom heat exchanger 3 are closed, cooling water (CWS/CWR) of the tower bottom heat exchanger 3 is cut off, a wastewater feed valve V-4 and a wastewater return valve V-5 of the tower bottom heat exchanger 3, an advanced wastewater feed valve V-6 and a post wastewater feed valve V-7 are opened, wastewater fed by the water stripper 1 enters the tower bottom heat exchanger 3 through a pipe side of the tower bottom heat exchanger 3 and exchanges heat with fluid with higher temperature flowing out of the bottom of the subsequent water stripper 1, under the condition, a small amount of LLPS is introduced by opening a steam flow regulating valve 2, so that wastewater in the water stripper 1 can be heated to a stripping temperature, the stripping treatment of the wastewater can be realized, the wastewater is qualified, the wastewater temperature flowing out of the bottom of the water stripper 1 is higher, after the shell side heat exchange of the tower bottom of the water stripper 1 is cooled, and the wastewater is removed to a subsequent water treatment device without using cooling water for cooling treatment. The device not only reduces the input of steam and cooling water, but also reduces the risk of exceeding the standard discharge of waste water COD caused by steam fluctuation, and ensures the efficient, energy-saving, environment-friendly and stable operation of the device.
According to the utility model, the stripper of the device is utilized to perform optimization transformation, and the low-temperature feed is subjected to heat exchange between the tube pass of the tower bottom heat exchanger and the hot discharge material which is required to be cooled after being heated, so that not only is the steam of cold materials required to be heated saved, but also high-temperature discharge cooling water is omitted, and the probability of exceeding the standard of COD (chemical oxygen demand) discharged from the wastewater due to fluctuation of a steam system is greatly reduced.
The utility model is universal for OXO chemical devices and is also suitable for other similar sewage stripping treatment devices.
Claims (5)
1. The utility model provides a heat recovery unit of water stripper in butanol and octanol device, includes water stripper, its characterized in that, the device include the heat exchanger at the bottom of the tower, wait to handle waste water and be connected to the heat exchanger at the bottom of the tower, after heat transfer with water stripper bottom of the tower ejection of compact, get into water stripper from tower upper portion.
2. The water stripper heat recovery apparatus in butanol-octanol plant of claim 1 wherein said water stripper vapor enters from the lower portion of the column and the vapor flow is regulated by a vapor flow regulating valve.
3. The water stripper heat recovery unit for butanol and octanol unit of claim 1 wherein said water stripper is a vertical packed column.
4. The water stripper heat recovery unit of butanol and octanol unit of claim 3 wherein said water stripper packing is pall rings.
5. The water stripper heat recovery unit of butanol and octanol unit of claim 1 wherein said bottom heat exchanger is a shell and tube heat exchanger, waste water passes through the tube pass, and water stripper bottom discharge passes through the shell pass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223012288.3U CN219217609U (en) | 2022-11-11 | 2022-11-11 | Heat recovery device of reclaimed water stripping tower in butanol-octanol device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223012288.3U CN219217609U (en) | 2022-11-11 | 2022-11-11 | Heat recovery device of reclaimed water stripping tower in butanol-octanol device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219217609U true CN219217609U (en) | 2023-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223012288.3U Active CN219217609U (en) | 2022-11-11 | 2022-11-11 | Heat recovery device of reclaimed water stripping tower in butanol-octanol device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219217609U (en) |
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2022
- 2022-11-11 CN CN202223012288.3U patent/CN219217609U/en active Active
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