CN211328812U - Acetic acid loading tail gas recovery system - Google Patents
Acetic acid loading tail gas recovery system Download PDFInfo
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- CN211328812U CN211328812U CN201921843221.XU CN201921843221U CN211328812U CN 211328812 U CN211328812 U CN 211328812U CN 201921843221 U CN201921843221 U CN 201921843221U CN 211328812 U CN211328812 U CN 211328812U
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- acetic acid
- tail gas
- washing tower
- recovery system
- gas recovery
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Abstract
The utility model discloses a tail gas recovery system for loading acetic acid, include: the sealing cap is provided with a loading arm and is used for covering a feeding hole of the acetic acid truck when the acetic acid truck is loaded; the air return pipe penetrates through the sealing cap; the washing tower is internally provided with a first liquid distributor, a packing layer and a second liquid distributor in sequence from top to bottom; the air inlet pipe is arranged on the side wall of the washing tower and is positioned below the second liquid distributor, one end of the air inlet pipe is positioned in the washing tower, and the other end of the air inlet pipe is connected with the outer end part of the air return pipe through a draught fan; the inlet of the circulating pump is communicated with the bottom of the washing tower through a pipeline, the outlet of the circulating pump is communicated with the inside of the washing tower through a pipeline, and the connecting point is positioned at the upper end of the second liquid distributor; a desalted water inlet pipe is arranged above the first liquid distributor and is connected with a desalted water source.
Description
Technical Field
The utility model relates to an acetic acid tail gas recovery technical field, in particular to acetic acid loading tail gas recovery system.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
Acetic acid is an organic monobasic acid and is strongly corrosive, and steam has a strong irritating effect on eyes and nose. The acetic acid is mainly used for producing vinyl acetate, acetic anhydride, cellulose acetate, terephthalic acid, chloroacetic acid, acetate and the like, and the derivatives of the acetic acid can be hundreds of types. The production method mainly comprises an ethanol acetaldehyde method, an ethylene acetaldehyde method and a methanol oxo-synthesis method, wherein the methanol oxo-synthesis method accounts for about 80 percent of the total production capacity.
The common crane pipe for filling acetic acid is divided into an upper filling type crane pipe and a lower filling type crane pipe, at present, most of domestic acetic acid tank trucks adopt the upper filling type crane pipe when filling acetic acid, because the domestic production design of the tank trucks lacks relevant standard specifications, the tank openings of the tank trucks are different in size, the defects of acetic acid volatilization, acid gas leakage and the like caused by tight sealing exist in the filling process, the environmental pollution and the resource waste are easily caused, the sharp acid gas brings certain threat to the safe filling of filling personnel, and the explosive gas is easily formed by mixing the high-concentration acid gas with the atmosphere and is a key potential safety hazard in the filling process.
Among the prior art, the sealed toper that adopts of facial make-up crane pipe is sealed mostly, because crane pipe mechanical operation mode, leads to between crane pipe toper seal cap and the jar mouth to mouthful difficulty, needs to spend a large amount of time to fix a position, and the location accuracy is poor and sealed reliability is low, and the efficiency of airtight loading also can greatly reduced, along with the liquid level rising of tank wagon, and a large amount of sour gas spills from the gap between toper seal cap and the jar mouth, retrieves the very big difficulty that brings for sour gas.
Disclosure of Invention
In order to solve the technical problem that exists among the prior art, the utility model aims at providing an acetic acid loading tail gas recovery system, this recovery system can carry out effective recovery to the tail gas that acetic acid loading in-process produced, can solve acetic acid and fill the problem that the dress is inefficient, the polluted environment is revealed easily to sour gas, has reduced VOC's emission, has alleviateed the environmental protection pressure of enterprise.
In order to solve the technical problem, the technical scheme of the utility model is that:
the utility model provides an acetic acid loading tail gas recovery system, includes:
the sealing cap is provided with a loading arm and is used for covering a feeding hole of the acetic acid truck when the acetic acid truck is loaded;
the air return pipe penetrates through the sealing cap;
the washing tower is internally provided with a first liquid distributor, a packing layer and a second liquid distributor in sequence from top to bottom;
the air inlet pipe is arranged on the side wall of the washing tower and is positioned below the second liquid distributor, one end of the air inlet pipe is positioned in the washing tower, and the other end of the air inlet pipe is connected with the outer end part of the air return pipe through a draught fan;
the inlet of the circulating pump is communicated with the bottom of the washing tower through a pipeline, the outlet of the circulating pump is communicated with the inside of the washing tower through a pipeline, and the connecting point is positioned at the upper end of the second liquid distributor;
a desalted water inlet pipe is arranged above the first liquid distributor and is connected with a desalted water source.
During the use, close the feed inlet at the tank wagon with sealed cap lid, utilize the oil filling riser to carry out the loading of acetic acid, fill dress tail gas under the pumping action of tail gas draught fan, flow out in the muffler of the sealed cap of oil filling riser toper, get into the tail gas washing tower, under the washing action of the washing liquid of circulating pump income and demineralized water, retrieve the acetic acid in the tail gas to avoid acetic acid to reveal and cause the pollution to the environment.
In some embodiments, a flame arrester is arranged on the pipeline between the air return pipe and the induced draft fan. To prevent external flames from entering the acetic acid tank car.
In some embodiments, the end of the gas inlet pipe is provided with a gas distributor, and the installation position of the gas distributor is lower than the liquid level of the washing liquid. The gas distributor divides the acetic acid tail gas into small gas flows, small bubbles are formed in the washing liquid, and the small bubbles are easily and fully mixed with the washing water to promote the dissolution of the acetic acid.
In some embodiments, the packing layer is an intalox ring packing.
In some embodiments, the liquid distributor further comprises an overflow pipe connected to the side wall of the washing tower and communicating with the interior of the washing tower, the connection point being located below the second liquid distributor, the overflow pipe being connected to the sump. The overflow pipe is used for recovering the overflow of the washed acetic acid solution, and the overflow pipe is arranged due to the supplement of desalted water in the washing process, so that the liquid level in the washing tower can be controlled to be constant, and the phenomenon that the liquid level in the washing tower is too high and overflows through a second liquid distributor is avoided.
Furthermore, a sight glass is arranged on the overflow pipe.
Furthermore, the bottom of the washing tower is connected with a liquid collecting tank, and a valve is arranged on a connecting pipeline. The method is used for recovering and treating the washed acetic acid.
In some embodiments, an exhaust pipe is connected to the top of the scrubber. Used for discharging redundant air in the washing tower and maintaining the pressure in the washing tower constant.
The utility model has the advantages that:
(1) the device adopts the stable and reliable absorption technology to recover the acetic acid in the filling tail gas, and creates remarkable economic benefit.
(2) Adopt the device, even if the sealed cap of oil filling riser toper is airtight not good with jar mouth, under the action of drawing of tail gas draught fan, sour gas still can not leak outward, has saved greatly and has filled dress time to mouthful, the work efficiency of improvement.
(3) By adopting the device, the discharge of VOC is greatly reduced, the environmental protection burden of enterprises is lightened, and a safe and comfortable working environment is created for staff.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is the utility model discloses acetic acid fills dress tail gas recovery device structure sketch map.
The device comprises a crane pipe 1, a seal cap 2, a feed inlet 3, a feed inlet 4, a flame arrester 5, a tail gas induced draft fan 6, a circulating pump 7, a gas distributor 8, a viewing mirror 9, an overflow pipe 10, a second liquid distributor 11, a rectangular saddle ring filler 12, an exhaust pipe 13 and a first liquid distributor.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, a tail gas recovery system for loading acetic acid includes: the sealing cap 2 is provided with a loading arm 1 and is used for covering a feed inlet 3 of the acetic acid truck when the acetic acid truck is loaded;
the air return pipe penetrates through the sealing cap 2, and a flame arrester 4 is arranged on a pipeline between the air return pipe and the draught fan 5. To prevent external flames from entering the acetic acid tank car.
The washing tower is internally provided with a first liquid distributor 13, a packing layer and a second liquid distributor 10 from top to bottom in sequence, wherein the packing layer is a intalox saddle ring packing 11.
The air inlet pipe is arranged on the side wall of the washing tower and located below the second liquid distributor 10, one end of the air inlet pipe is located inside the washing tower, the end portion of the air inlet pipe is provided with a gas distributor 7, and the installation position of the gas distributor 7 is lower than the liquid level of the washing liquid. The gas distributor divides acetic acid tail gas into small gas flows, small bubbles are formed in the washing liquid and are easy to be fully mixed with washing water to promote the dissolution of acetic acid, and the other end of the gas distributor is connected with the outer end part of the gas return pipe through a draught fan;
an inlet of the circulating pump 6 is communicated with the bottom of the washing tower through a pipeline, an outlet of the circulating pump 6 is communicated with the inside of the washing tower through a pipeline, and a connecting point is positioned at the upper end of the second liquid distributor 10;
a desalted water inlet pipe is arranged above the first liquid distributor 13 and is connected with a desalted water source.
the bottom of the washing tower is also connected with the liquid collecting tank, and a valve is arranged on the connecting pipeline. The method is used for recovering and treating the washed acetic acid. The top of the washing tower is connected with an exhaust pipe.
The process flow comprises the following steps: the filling tail gas flows out of the air return pipe of the conical sealing cap of the oil filling riser under the pumping action of a tail gas draught fan and enters a tail gas washing tower, the air return pipe is inserted into the lower part of the liquid level, a sprayer is arranged at the root part of the air return pipe, so that the acid gas is broken into small bubbles and is fully mixed with water, and most of acetic acid in the acid gas is dissolved in the water.
In order to ensure the acetic acid to be fully absorbed, two paths of washing are arranged in the tail gas washing tower, one path of washing is self-circulation washing, and the other path of washing is desalted water.
The self-circulation washing process comprises the following steps: the washing liquid enters the tower from the middle part of the tail gas washing tower under the pressure of the washing circulating pump, the liquid is uniformly distributed by the liquid distributor and is subjected to mass transfer with the rising acid gas, and the acetic acid in the acid gas is further absorbed.
The desalted water washing process comprises the following steps: desalted water enters the tail gas washing tower from the top of the tail gas washing tower, is uniformly distributed through the liquid distributor, flows into the intalox saddle packing layer, and is subjected to mass transfer with acid gas containing a small amount of acetic acid, so that the acetic acid in the tail gas is fully absorbed, and the absorbed tail gas is discharged into the atmosphere through the exhaust pipe. In order to ensure the stable liquid level of the tail gas washing tower, an overflow pipe is arranged in the middle of the tower, and the absorbed acetic acid aqueous solution flows into a liquid collecting tank from the overflow pipe for recovery treatment.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides an acetic acid loading tail gas recovery system which characterized in that: the method comprises the following steps:
the sealing cap is provided with a loading arm and is used for covering a feeding hole of the acetic acid truck when the acetic acid truck is loaded;
the air return pipe penetrates through the sealing cap;
the washing tower is internally provided with a first liquid distributor, a packing layer and a second liquid distributor in sequence from top to bottom;
the air inlet pipe is arranged on the side wall of the washing tower and is positioned below the second liquid distributor, one end of the air inlet pipe is positioned in the washing tower, and the other end of the air inlet pipe is connected with the outer end part of the air return pipe through a draught fan;
the inlet of the circulating pump is communicated with the bottom of the washing tower through a pipeline, the outlet of the circulating pump is communicated with the inside of the washing tower through a pipeline, and the connecting point is positioned at the upper end of the second liquid distributor;
a desalted water inlet pipe is arranged above the first liquid distributor and is connected with a desalted water source.
2. The acetic acid loading tail gas recovery system of claim 1, characterized in that: a flame arrester is arranged on the pipeline between the air return pipe and the draught fan.
3. The acetic acid loading tail gas recovery system of claim 1, characterized in that: the end of the air inlet pipe is provided with an air distributor, and the installation position of the air distributor is lower than the liquid level of the washing liquid.
4. The acetic acid loading tail gas recovery system of claim 1, characterized in that: the filler layer is a intalox saddle ring filler.
5. The acetic acid loading tail gas recovery system of claim 1, characterized in that: still include the overflow pipe, the overflow pipe is connected with the lateral wall of scrubbing tower to with the inside intercommunication of scrubbing tower, the tie point is located second liquid distributor below, the overflow pipe is connected with the collecting tank.
6. The acetic acid loading tail gas recovery system of claim 5, characterized in that: a sight glass is arranged on the overflow pipe.
7. The acetic acid loading tail gas recovery system of claim 5, characterized in that: the bottom of the washing tower is connected with the liquid collecting tank, and a valve is arranged on the connecting pipeline.
8. The acetic acid loading tail gas recovery system of claim 1, characterized in that: and the top of the washing tower is connected with an exhaust pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921843221.XU CN211328812U (en) | 2019-10-28 | 2019-10-28 | Acetic acid loading tail gas recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921843221.XU CN211328812U (en) | 2019-10-28 | 2019-10-28 | Acetic acid loading tail gas recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211328812U true CN211328812U (en) | 2020-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921843221.XU Active CN211328812U (en) | 2019-10-28 | 2019-10-28 | Acetic acid loading tail gas recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211328812U (en) |
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2019
- 2019-10-28 CN CN201921843221.XU patent/CN211328812U/en active Active
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