CN210303071U - Ammonia removal device for polymerized vinyl chloride tail gas - Google Patents
Ammonia removal device for polymerized vinyl chloride tail gas Download PDFInfo
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- CN210303071U CN210303071U CN201920808361.7U CN201920808361U CN210303071U CN 210303071 U CN210303071 U CN 210303071U CN 201920808361 U CN201920808361 U CN 201920808361U CN 210303071 U CN210303071 U CN 210303071U
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Abstract
The utility model discloses a polymerization chloroethylene tail gas ammonia removal device, including removing the ammonia tower, circulation liquid basin and heat exchanger, the bottom that removes the ammonia tower goes out liquid hole leads toThe pipeline A is connected with a circulating liquid storage tank, a liquid outlet of the circulating liquid storage tank is connected with a circulating liquid inlet at the lower end of the heat exchanger through a pipeline B, and a circulating liquid outlet at the top of the heat exchanger is connected with the upper end of the ammonia removal tower through a pipeline C; the gas outlet at the upper end of the circulating liquid storage tank is collected in a pipeline D through a pipeline E and is connected with an external chloroethylene gas holder; the utility model relates to a rationally, remove ammonia effectually, through improving, overcome the pollution of ammonia to the external world, pass through simultaneously the utility model discloses polymerization recovery tail gas after the processing does not contain NH in the product gas when recycling3The upper part of the converter is basically free from the generation of white powder ammonium chloride, so that the normal and stable operation of a vinyl chloride synthesizing device is ensured, and the labor intensity is reduced.
Description
Technical Field
The utility model relates to an ammonia removal equipment in chemical industry field, specifically say a polymerization chloroethylene tail gas ammonia removal device.
Background
In the production process of PVC by a calcium carbide method, the pH value of a chloroethylene polymerization reaction system has great influence on the stability of the dispersing agent, the polymerization rate and the quality of PVC resin. In order to stabilize the pH value of the polymerization system and ensure the properties of the PVC resin such as particle shape, porosity and the like, buffers such as ammonia water and ammonium bicarbonate are required to be added for adjustment. The ammonia gas generated by the decomposition of ammonium bicarbonate and ammonia water by heating in the polymerization process is mixed with unreacted chloroethylene (namely tail gas recovered by polymerization), and enters a chloroethylene gas cabinet through a foam catcher. Tail gas of chloroethylene in the gas holder after compression, condensation and rectification is adsorbed by a pressure swing adsorption device, and unadsorbed NH is3The air is emptied by purified air, so that certain pollution is caused to the atmosphere; and adsorbed NH3And (4) after being analyzed, feeding the product gas into a converter, pressurizing and conveying the product gas to react with HCl to generate white powder ammonium chloride. The resistance of the conversion system is increased, the production load is reduced, and the equipment can not normally run. In order to meet the production load, only the white powder on the upper part of the converter can be frequently extracted, but the white powder is regenerated after several days, the converter needs to be frequently switched, the labor intensity and the safety risk are increased, and meanwhile, part of the catalyst is extracted, and the catalyst consumption and the production cost are increased.
The traditional process is as follows:
referring to FIG. 3, the polymerization recovered tail gas (ammonia gas and unreacted vinyl chloride) enters the vinyl chloride gas cabinet through the recovered gas main. Tail gas ventilation of chloroethylene in chloroethylene gas holder after compression, condensation and rectificationAdsorbing the unadsorbed NH by a pressure swing adsorption device3The air is emptied by purified air, which causes certain pollution to the atmosphere. Adsorbed NH3The finished gas enters a converter and reacts with HCl to generate white powder ammonium chloride, so that the resistance of a conversion system is increased, the production load is reduced, and the equipment cannot normally operate.
SUMMERY OF THE UTILITY MODEL
Therefore, in order to overcome the above insufficiency, the utility model provides a reasonable in design, convenient to use removes ammonia effectual ammonia removal device and method, the utility model discloses an improve, overcome ammonia to external pollution among the traditional art, process simultaneously the utility model discloses polymerization recovery tail gas after the processing does not contain NH when recycling in the product gas because of not containing the product gas3The upper part of the converter is basically free from the generation of white powder ammonium chloride, so that the normal and stable operation of a vinyl chloride synthesis device is ensured, and the labor intensity, the safety risk and the production cost are reduced; the utility model relates to an ingenious, rationally distributed, easy production and manufacturing.
The utility model is realized in such a way, a polymerized chloroethylene tail gas ammonia removal device is constructed, which comprises an ammonia removal tower, a circulating liquid storage tank and a heat exchanger, wherein a liquid outlet hole at the bottom of the ammonia removal tower is connected with the circulating liquid storage tank through a pipeline A, a liquid outlet of the circulating liquid storage tank is connected with a circulating liquid inlet at the lower end of the heat exchanger through a pipeline B, and a circulating liquid outlet at the top of the heat exchanger is connected with the upper end of the ammonia removal tower through a pipeline C;
a gas outlet at the upper end of the ammonia removal tower is connected with an external chloroethylene gas holder through a pipeline D;
the gas outlet at the upper end of the circulating liquid storage tank is collected in a pipeline D through a pipeline E and is connected with an external chloroethylene gas holder;
meanwhile, the pipeline C is led out by a lead-out valve to be connected with an external polymerization device through a pipeline F, and a thermometer arranged on the pipeline C is arranged at the front end of the pipeline F.
Preferably, a sampling port is arranged at the rear end of the convergence part of the pipeline D and the pipeline E.
Preferably, the circulating liquid storage tank is connected with a water replenishing pipe, and a water replenishing valve is arranged on the water replenishing pipe.
Preferably, the circulating liquid storage tank is provided with a liquid level meter for monitoring the liquid level in the tank, and the liquid level meter interacts with the water replenishing valve.
Preferably, the pipeline B is provided with a circulating liquid pump for pressurizing the circulating liquid, and a pressure gauge for monitoring the internal pressure of the pipeline B is arranged at the rear end of the circulating liquid pump.
The ammonia removal device for the polymerized vinyl chloride tail gas is used as follows:
the method comprises the following steps: conveying polymerization tail gas upwards from the bottom of an ammonia removal tower, and treating the polymerization tail gas after passing through the ammonia removal tower into vinyl chloride tail gas and circulating liquid absorbed with ammonia gas, wherein the circulating liquid enters a circulating liquid storage tank through a pipeline A, and the vinyl chloride tail gas enters a pipeline D;
step two: the circulating liquid entering the circulating liquid storage tank enters the heat exchanger through the action of the pipeline B and the circulating liquid pump, the chloroethylene gas separated from the circulating liquid in the circulating liquid storage tank is collected in the pipeline D through the pipeline E and is discharged to an external chloroethylene gas holder, tail gas obtained by compressing, condensing and rectifying chloroethylene in the chloroethylene gas holder of the chloroethylene gas holder is adsorbed through the pressure swing adsorption device, the unadsorbed purified gas reaches the standard and is discharged, and the adsorbed product gas enters the converter for reaction, so that the product gas does not contain NH (NH)3The upper part of the converter is basically free from white powder ammonium chloride;
step three: the circulating liquid after heat exchange of the heat exchanger is sent into the ammonia removal tower from the top end of the ammonia removal tower through a pipeline C, so that repeated circulating absorption is realized;
step four: when the content of dissolved ammonia in the circulating liquid cooled by the heat exchanger reaches a specified value, the export valve is opened and the circulating liquid is discharged to an external polymerization device by using the pipeline F, so that the cyclic utilization of the ammonia water is realized.
Preferably, the water level of the circulating liquid storage tank in the second step is kept between 75 and 85 percent of the volume of the tank body. The liquid level meter 6 is used for detecting, and when the liquid level is lower than 75%, the water replenishing valve 7 works to realize the replenishment of pure water; when the liquid level meter 6 displays that the liquid level is higher than 85%, the water replenishing valve 7 is automatically closed, and water replenishing is stopped.
Preferably, in the second step, the pressure in the pipeline B is controlled to be 0.3 MPa.
Preferably, in the third step, the temperature in the conduit C is controlled to 30 ℃ or lower.
Preferably, in the third step, the cooled ammonia-containing circulating liquid enters the ammonia removal tower from the tower top, and the flow rate of the circulating liquid is 20-25 m3/h。
The utility model discloses following beneficial effect has:
the utility model relates to a rationally, simple structure, convenient to use removes ammonia effectually, through improving, has overcome ammonia to external pollution among the traditional art, simultaneously through the utility model discloses polymerization recovery tail gas after the processing does not contain NH in the product gas when recycling, because of the product gas3The upper part of the converter is basically free from the generation of white powder ammonium chloride, so that the normal and stable operation of a vinyl chloride synthesis device is ensured, and the labor intensity, the safety risk and the production cost are reduced; the utility model relates to an ingenious, rationally distributed, easy production and manufacturing.
Drawings
FIG. 1 is a schematic diagram of a polymeric vinyl chloride tail gas ammonia removal unit;
FIG. 2 is a process diagram of an ammonia removal process using an ammonia removal unit for tail gas of polymerized vinyl chloride;
fig. 3 is a process diagram of a conventional technique.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 3, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1-3, the present invention provides a tail gas ammonia removal device for polymerized vinyl chloride, which comprises an ammonia removal tower 1, a circulating liquid storage tank 3 and a heat exchanger 5, wherein a liquid outlet at the bottom of the ammonia removal tower 1 is connected with the circulating liquid storage tank 3 through a pipeline a1.1, a liquid outlet of the circulating liquid storage tank 3 is connected with a circulating liquid inlet at the lower end of the heat exchanger 5 through a pipeline B3.1, and a circulating liquid outlet at the top of the heat exchanger 5 is connected with the upper end of the ammonia removal tower 1 through a pipeline C5.1;
a gas outlet at the upper end of the ammonia removal tower 1 is connected with an external chloroethylene gas holder through a pipeline D1.2;
the gas outlet at the upper end of the circulating liquid storage tank 3 is collected in a pipeline D1.2 through a pipeline E3.2 and is connected with an external chloroethylene gas holder;
meanwhile, a pipeline F5.2 is led out of the pipeline C5.1 through a lead-out valve and is connected with an external polymerization device, and a thermometer 9 arranged on the pipeline C is arranged at the front end of the pipeline F.
In this embodiment, a sampling port 10 is opened at the rear end of the junction of the pipeline D1.2 and the pipeline E3.2.
In this embodiment, the circulating liquid storage tank 3 is connected with a water replenishing pipe 7, and a water replenishing valve 7.1 is installed on the water replenishing pipe 7.
In this embodiment the circulating liquid tank 3 is equipped with a level gauge 6 for monitoring the level of liquid in the tank, and the level gauge 6 interacts with a water replenishment valve 7.1. In this embodiment, the pipe B3.1 is provided with a circulation pump 4 for pressurizing the circulation liquid, and a pressure gauge 8 for monitoring the internal pressure of the pipe B3.1 is provided at the rear end of the circulation pump.
The utility model discloses when using, polymerization recovery tail gas (ammonia and unreacted chloroethylene) gets into from removing ammonia tower 1 lower part, through sieve 2 and the back of circulating liquid contact many times, NH in the tail gas3Fully absorbed by circulating liquid, the absorbed circulating liquid automatically flows into a circulating liquid storage tank 3, the display value of a liquid level meter 6 of the circulating liquid tank is controlled to be 75-85% (the liquid level is lower than 75%, a water replenishing valve 7 automatically replenishes pure water, the display value of the liquid level meter 6 is higher than 85%, the water replenishing valve 7 automatically closes), the circulating liquid absorbing ammonia gas is pressurized to a pressure gauge 8 through a circulating liquid pump 4 to be 0.3MPa, the circulating liquid enters a heat exchanger 5 for cooling, the display value of a pipeline thermometer 9 at the outlet of the heat exchanger is controlled to be below 30 ℃, the cooled ammonia-containing circulating liquid enters the top of an ammonia removal tower 1, the flow of the circulating liquid is 20-253H, continuously absorbing NH in tail gas3And when the ammonia concentration in the circulating liquid reaches a specified value, opening a leading-out valve for polymerization reaction, and sending the ammonia water solution to a polymerization device for recycling.
The chloroethylene tail gas after ammonia removal is discharged from the top of the ammonia removal tower 1 and enters a chloroethylene gas cabinet together with chloroethylene gas separated from the circulating liquid storage tank 3. Tail gas of chloroethylene in a chloroethylene gas holder after compression, condensation and rectification is adsorbed by a pressure swing adsorption device, unadsorbed purified gas reaches the standard and is discharged, and the adsorbed product gas enters a converter for reaction, so that the product gas does not contain NH3The upper part of the converter is basically free from white powder ammonium chloride; removing NH in tail gas recovered by vinyl chloride polymerization3Elimination of NH3The normal and stable operation of the chloroethylene synthesizing device is ensured due to the pollution to the atmosphere and the influence on a conversion system, and the labor intensity, the safety risk and the production cost are reduced.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. The utility model provides a polymerization chloroethylene tail gas removes ammonia device which characterized in that: the device comprises an ammonia removal tower (1), a circulating liquid storage tank (3) and a heat exchanger (5), wherein a liquid outlet hole at the bottom of the ammonia removal tower (1) is connected with the circulating liquid storage tank (3) through a pipeline A (1.1), a liquid outlet of the circulating liquid storage tank (3) is connected with a circulating liquid inlet at the lower end of the heat exchanger (5) through a pipeline B (3.1), and a circulating liquid outlet at the top of the heat exchanger (5) is connected with the upper end of the ammonia removal tower (1) through a pipeline C (5.1);
a gas outlet at the upper end of the ammonia removal tower (1) is connected with an external chloroethylene gas holder through a pipeline D (1.2);
a gas outlet at the upper end of the circulating liquid storage tank (3) is collected in a pipeline D (1.2) through a pipeline E (3.2) and is connected with an external chloroethylene gas holder;
meanwhile, a pipeline F (5.2) is led out of the pipeline C (5.1) through a lead-out valve and is connected with an external polymerization device, and a thermometer (9) arranged on the pipeline C is arranged at the front end of the pipeline F.
2. The ammonia removal device for tail gas of polymerized vinyl chloride according to claim 1, which is characterized in that: and a sampling port (10) is formed at the rear end of the convergence part of the pipeline D (1.2) and the pipeline E (3.2).
3. The ammonia removal device for tail gas of polymerized vinyl chloride as claimed in claim 1 or 2, wherein: the circulating liquid storage tank (3) is connected with a water replenishing pipe (7), and a water replenishing valve (7.1) is arranged on the water replenishing pipe (7).
4. The ammonia removal device for tail gas of polymerized vinyl chloride according to claim 3, characterized in that: the circulating liquid storage tank (3) is provided with a liquid level meter (6) for monitoring the liquid height in the tank.
5. The ammonia removal device for tail gas of polymerized vinyl chloride according to claim 1, which is characterized in that: and a circulating liquid pump (4) for pressurizing circulating liquid is arranged on the pipeline B (3.1), and a pressure gauge (8) for monitoring the internal pressure of the pipeline B (3.1) is arranged at the rear end of the circulating liquid pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920808361.7U CN210303071U (en) | 2019-05-31 | 2019-05-31 | Ammonia removal device for polymerized vinyl chloride tail gas |
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| CN201920808361.7U CN210303071U (en) | 2019-05-31 | 2019-05-31 | Ammonia removal device for polymerized vinyl chloride tail gas |
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| CN210303071U true CN210303071U (en) | 2020-04-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110193270A (en) * | 2019-05-31 | 2019-09-03 | 成都华融化工有限公司 | A kind of polymerizing vinyl chloride tail gas ammonia removal device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110193270A (en) * | 2019-05-31 | 2019-09-03 | 成都华融化工有限公司 | A kind of polymerizing vinyl chloride tail gas ammonia removal device and method |
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Address after: 611930 No. 166 Linyang Road, Jiuchi Town, Pengzhou City, Chengdu, Sichuan Province Patentee after: Huarong Chemical Co., Ltd Address before: 611930 No. 166 Linyang Road, Jiuchi Town, Pengzhou City, Chengdu, Sichuan Province Patentee before: CHENGDU HUARONG CHEMICAL Co.,Ltd. |
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