CN210206372U - Polyvinyl alcohol drying tail gas purification system - Google Patents
Polyvinyl alcohol drying tail gas purification system Download PDFInfo
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- CN210206372U CN210206372U CN201920761215.3U CN201920761215U CN210206372U CN 210206372 U CN210206372 U CN 210206372U CN 201920761215 U CN201920761215 U CN 201920761215U CN 210206372 U CN210206372 U CN 210206372U
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Abstract
The utility model relates to the technical field of waste gas treatment, and discloses a polyvinyl alcohol drying tail gas purification system, which comprises a first condenser, a vacuum pump and a second condenser which are connected in sequence through pipelines, wherein a tail gas conveying pipeline is communicated with an air inlet of the first condenser, and an air outlet of the second condenser is communicated with a first absorption tower and a second absorption tower in sequence through pipelines; the first spraying layer is arranged in the first absorption tower, a liquid inlet of the first spraying layer is communicated with the methanol storage tank through a methanol liquid conveying pipe, the second spraying layer is arranged in the second absorption tower, and a liquid inlet of the second spraying layer is communicated with the desalted water storage tank through a desalted water liquid conveying pipe. The absorption tower of the utility model utilizes the characteristic that methyl acetate is easy to dissolve in methanol, adopts refined methanol to wash and absorb methyl acetate, and the washing liquid is recycled and sent to the rectifying tower for treatment; the second absorption tower utilizes the characteristic that methanol is easily dissolved in water, desalted water is adopted for washing and absorbing the methanol, and washing liquid is recycled and sent to the rectifying tower for treatment.
Description
Technical Field
The utility model relates to a waste gas treatment technical field especially relates to a dry tail gas clean system of polyvinyl alcohol.
Background
The polyvinyl alcohol production device is introduced from abroad in the last 70 th century, and dry tail gas is directly emptied after two-stage low-temperature condensation and absorption in the polyvinyl alcohol production process at present. The discharged waste gas still contains more methanol and methyl ester gases (nitrogen gas 78%, methanol 4%, methyl acetate 15% and a small amount of oxygen), and the requirements of 'discharge standards of pollutants in petrochemical industry' cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model provides a polyvinyl alcohol drying tail gas purification system that purifying effect is better.
The technical problem to be solved is that: in the production process of polyvinyl alcohol, after dry tail gas is absorbed by two-stage low-temperature condensation, more methanol and methyl ester gases are still contained in the discharged waste gas.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model relates to a polyvinyl alcohol drying tail gas purification system, which comprises a first condenser, a vacuum pump and a second condenser which are connected in sequence through pipelines, wherein a tail gas conveying pipeline is communicated with an air inlet of the first condenser, and an air outlet of the second condenser is communicated with an absorption first tower and an absorption second tower in sequence through pipelines;
the absorption tower comprises a first absorption tower, a second absorption tower, a first spray layer, a methanol storage tank, a second spray layer, a desalted water transfer pipe and a desalted water storage tank, wherein the first absorption tower is internally provided with the first spray layer, a liquid inlet of the first spray layer is communicated with the methanol storage tank through the methanol transfer pipe, the methanol transfer pipe is sequentially connected with a first control valve and a flowmeter in series, the second absorption tower is internally provided with the second spray layer, a liquid inlet of the second spray layer is communicated with the desalted water storage tank through the desalted water.
Further, the first absorption tower and the second absorption tower respectively comprise a cylindrical tower body, the bottom end of the tower body is sealed, a spherical cap-shaped seal head is arranged at the top end of the tower body, an air outlet pipe is arranged at the top of the seal head, and an air inlet pipe is arranged at the bottom of the tower body.
Further, the first layer and the second of spraying all include the spray tube dish that the level set up and the inlet tube that is linked together with spray tube dish inside that sprays, the end of intaking of inlet tube is connected with the liquid outlet of methyl alcohol transfer line or desalinized water transfer line, and the play water end is located the centre of a circle position of spray tube dish.
Furthermore, the spray pipe disc comprises a group of concentric circular pipes arranged at horizontal intervals and a connecting pipe connected between every two adjacent circular pipes, the connecting pipe is communicated with the inside of the circular pipes, and water spray holes are uniformly distributed in the bottoms of the circular pipes and the connecting pipe.
Furthermore, the top of the inner wall of the tower body is provided with bosses distributed in a circumferential array mode, and the spray pipe disc is arranged on the bosses.
Further, the bottom of the tower body is also provided with a recovery pipeline communicated with the inside of the tower body, and a liquid outlet of the recovery pipeline is communicated with the rectifying tower.
The utility model relates to a polyvinyl alcohol drying tail gas clean system compares with prior art, has following beneficial effect:
the utility model discloses combine polyvinyl alcohol production characteristics and material characteristic, introduce in the production process raw materials and carry out the two-stage washing to tail gas and absorb the organic matter. The absorption tower I utilizes the characteristic that methyl acetate is easy to dissolve in methanol, refined methanol is adopted to wash and absorb methyl acetate, and washing liquid is recycled and sent to the rectifying tower for treatment; the second absorption tower utilizes the characteristic that methanol is easily dissolved in water, desalted water is adopted for washing and absorbing the methanol, and washing liquid is recycled and sent to the rectifying tower for treatment. The concentration of organic matters in the waste gas is less than 50mg/m3 after the waste gas is washed by the first absorption tower and the second absorption tower, thereby reaching the emission standard.
The purification system is adopted to treat the dry tail gas of the polyvinyl alcohol, so that the environmental protection requirement can be met, and the washing liquid in the whole waste gas treatment process enters the existing equipment in the device for recycling, so that new pollutants are not generated.
The following will further explain the system for purifying polyvinyl alcohol drying tail gas according to the present invention with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a polyvinyl alcohol drying tail gas purification system of the present invention;
FIG. 2 is a schematic diagram of an absorption tower of a polyvinyl alcohol drying exhaust gas purification system according to the present invention;
FIG. 3 is a first schematic structural view of a spray pipe of a polyvinyl alcohol drying tail gas purification system of the present invention;
FIG. 4 is a second schematic structural view of a spray pipe of the polyvinyl alcohol drying tail gas purification system of the present invention;
FIG. 5 is a schematic structural diagram of a boss of a polyvinyl alcohol drying exhaust gas purification system according to the present invention;
the system comprises a first condenser 1, a vacuum pump 2, a second condenser 3, a first absorption tower 4, a second absorption tower 5, a tower body 6, a seal head 7, an air inlet pipe 8, a water inlet pipe 91, a circular pipe 92, a connecting pipe 93, a water spraying hole 94, a boss 10 and a recovery pipeline 11.
Detailed Description
As shown in fig. 1-5, the present invention relates to a purification system for polyvinyl alcohol drying tail gas, which comprises a first condenser 1, a vacuum pump 2 and a second condenser 3 connected in sequence by pipes, wherein a tail gas conveying pipe is communicated with an air inlet of the first condenser 1, and an air outlet of the second condenser is communicated with a first absorption tower 4 and a second absorption tower 5 in sequence by pipes; a first spraying layer is arranged in the first absorption tower 4, a liquid inlet of the first spraying layer is communicated with a methanol storage tank 12 through a methanol liquid conveying pipe, a first control valve 13 and a flowmeter 14 are sequentially connected on the methanol liquid conveying pipe in series, a second spraying layer is arranged in the second absorption tower 5, a liquid inlet of the second spraying layer is communicated with a desalted water storage tank 15 through a desalted water liquid conveying pipe, and a second control valve 16 and a flowmeter 14 are sequentially connected on the desalted water liquid conveying pipe in series. The utility model discloses an absorption tower 4 utilizes the characteristics of methyl acetate easily soluble in methyl alcohol, adopts smart methyl alcohol washing to absorb methyl acetate, absorbs two tower 5 and utilizes the characteristics of the easily soluble in water of methyl alcohol, adopts the desalinized water washing to absorb methyl alcohol, through absorbing tower 4, absorbing two tower 5 two-stage washing back waste gas organic matter concentration <50mg/m3, reaches emission standard, tail gas from absorbing two tower 5 exhaust in the atmosphere.
Specifically, absorb one tower 4 and absorb two towers 5 and all including being cylindric body of tower 6, the sealed setting in 6 bottoms of body of tower, the top is provided with spherical head 7, and 7 tops of head are provided with the outlet duct, and 6 bottoms of body of tower are provided with intake pipe 8, and dry tail gas in the tail gas pipeline gets into in the body of tower 6 from the intake pipe 8 on absorbing one tower 4.
The first layer and the second of spraying all include the spray tube dish that the level set up and the inlet tube 91 that is linked together with the spray tube dish is inside, and the end of intaking of inlet tube 91 is connected with the liquid outlet of methyl alcohol transfer line or desalinized water transfer line, and the play water end is located the centre of a circle position of spray tube dish. The spray pipe disc comprises a group of concentric circular ring pipes 92 arranged at intervals horizontally and a connecting pipe 93 connected between every two adjacent circular ring pipes 92, the connecting pipe 93 is communicated with the inside of the circular ring pipes 92, and water spray holes 94 are uniformly distributed at the bottoms of the circular ring pipes 92 and the connecting pipe 93. The washing liquid flows into the spray pipe dish from inlet tube 91, forms the water curtain in body of the tower 6 from the discharge orifice 94 outflow, and the machine thing that the tail gas was detached to dry tail gas behind the water curtain washing is thick, reaches the purpose of purification, and the spray pipe dish is favorable to forming more even water curtain, makes purifying effect better. The top of the inner wall of the tower body 6 is provided with bosses 10 distributed in a circumferential array, and the spray pipe disc is arranged on the bosses 10. The boss 10 provides support for the spray tube tray.
The bottom of the tower body 6 is also provided with a recovery pipeline 11 communicated with the inside of the tower body 6, and a liquid outlet of the recovery pipeline 11 is communicated with the rectifying tower. The recovery pipeline 11 recovers the washing liquid falling into the bottom of the tower body 6 to the rectifying tower for rectification, substances such as methanol and methyl acetate in the washing liquid are separated, and substances such as methanol which can be recycled are recycled, so that the cost is saved.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (6)
1. The utility model provides a dry tail gas clean system of polyvinyl alcohol, includes first condenser (1), vacuum pump (2) and second condenser (3) that connect in order through the pipeline, and the air inlet intercommunication of tail gas pipeline and first condenser (1), its characterized in that: the air outlet of the second condenser is sequentially communicated with the first absorption tower (4) and the second absorption tower (5) through pipelines;
a first spraying layer is arranged in the first absorption tower (4), a liquid inlet of the first spraying layer is communicated with a methanol storage tank (12) through a methanol liquid conveying pipe, and a first control valve (13) and a flowmeter (14) are sequentially connected in series on the methanol liquid conveying pipe; and a second spraying layer is arranged in the second absorption tower (5), a liquid inlet of the second spraying layer is communicated with a desalted water storage tank (15) through a desalted water conveying pipe, and a second control valve (16) and a flow meter (14) are sequentially connected onto the desalted water conveying pipe in series.
2. The polyvinyl alcohol drying tail gas purification system according to claim 1, wherein: absorb one tower (4) and absorb two towers (5) and all including being cylindric body of the tower (6), body of the tower (6) bottom seal sets up, and the top is provided with spherical head (7), head (7) top is provided with the outlet duct, body of the tower (6) bottom is provided with intake pipe (8).
3. The polyvinyl alcohol drying tail gas purification system according to claim 2, wherein: the first layer and the second of spraying all spray the spray tube dish that the layer set up including the level and with spray tube dish inside inlet tube (91) be linked together, the end of intaking of inlet tube (91) is connected with the liquid outlet of methyl alcohol transfer line or desalinized water transfer line, and the play water end is located the centre of a circle position of spray tube dish.
4. The polyvinyl alcohol drying tail gas purification system according to claim 3, wherein: the spray pipe disc is composed of a group of concentric circular ring pipes (92) arranged horizontally at intervals and a connecting pipe (93) connected between every two adjacent circular ring pipes (92), the connecting pipe (93) is communicated with the inside of each circular ring pipe (92), and water spray holes (94) are uniformly distributed in the bottoms of the circular ring pipes (92) and the connecting pipe (93).
5. The polyvinyl alcohol drying tail gas purification system according to claim 4, wherein: the tower body (6) inner wall top is provided with boss (10) that are the circumference array and distribute, the sprinkler pipe dish sets up on boss (10).
6. The polyvinyl alcohol drying tail gas purification system according to claim 2, wherein: the bottom of the tower body (6) is also provided with a recovery pipeline (11) communicated with the inside of the tower body (6), and a liquid outlet of the recovery pipeline (11) is communicated with the rectifying tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920761215.3U CN210206372U (en) | 2019-05-24 | 2019-05-24 | Polyvinyl alcohol drying tail gas purification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920761215.3U CN210206372U (en) | 2019-05-24 | 2019-05-24 | Polyvinyl alcohol drying tail gas purification system |
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| Publication Number | Publication Date |
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| CN210206372U true CN210206372U (en) | 2020-03-31 |
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| CN201920761215.3U Active CN210206372U (en) | 2019-05-24 | 2019-05-24 | Polyvinyl alcohol drying tail gas purification system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841246A (en) * | 2020-07-09 | 2020-10-30 | 大连理工大学 | Method for treating tail gas in process for preparing high-purity pseudo-boehmite |
| CN112588085A (en) * | 2020-10-20 | 2021-04-02 | 临涣焦化股份有限公司 | Tail gas treatment device and method for methanol storage tank |
-
2019
- 2019-05-24 CN CN201920761215.3U patent/CN210206372U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841246A (en) * | 2020-07-09 | 2020-10-30 | 大连理工大学 | Method for treating tail gas in process for preparing high-purity pseudo-boehmite |
| CN112588085A (en) * | 2020-10-20 | 2021-04-02 | 临涣焦化股份有限公司 | Tail gas treatment device and method for methanol storage tank |
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