CN219058674U - Reaction tower for treating PVC centrifugal mother liquor - Google Patents
Reaction tower for treating PVC centrifugal mother liquor Download PDFInfo
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- CN219058674U CN219058674U CN202223232869.8U CN202223232869U CN219058674U CN 219058674 U CN219058674 U CN 219058674U CN 202223232869 U CN202223232869 U CN 202223232869U CN 219058674 U CN219058674 U CN 219058674U
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Abstract
The utility model provides a reaction tower for treating PVC centrifugal mother liquor, which comprises a reaction tower body, a liquid distribution device, a gas distribution device and a catalytic device, wherein the liquid distribution device comprises a liquid inlet pipe, the liquid inlet pipe extends into the bottom of the reaction tower from the top of the reaction tower, the tail end of the liquid inlet pipe is provided with a liquid distribution pipe, and a plurality of liquid distribution spray heads are arranged on the liquid distribution pipe; the gas distribution device comprises a gas inlet pipe, the gas inlet pipe extends into the bottom of the reaction tower from the top of the reaction tower, a gas distribution pipe is arranged at the tail end of the gas inlet pipe, the gas distribution pipe is arranged below the liquid distribution pipe, and a plurality of gas distribution spray heads are arranged on the gas distribution pipe. According to the utility model, the sealed ozone reaction tower is arranged at the rear end of biochemical treatment of the PVC centrifugal mother liquor, so that the oxidation reaction rate of CODcr in water is increased, the content of CODcr is reduced, the index requirement of a subsequent water production process is met, and reaction equipment is provided for efficient and complete recycling of the centrifugal mother liquor.
Description
Technical Field
The utility model belongs to a centrifugal mother liquor treatment device in the polyvinyl chloride industry, and particularly relates to a reaction tower for treating PVC centrifugal mother liquor.
Background
The production of polyvinyl chloride (PVC) in China mainly adopts a calcium carbide method. In the process of producing PVC resin, the addition of vinyl chloride monomer is gradually increased, but 60% -70% of water is still used. The water does not participate in the reaction, but removes the heat of reaction, carries the dispersing agent, and is convenient for stirring and transportation. After the PVC polymerization reaction, 70% of the water in the slurry was separated, called the centrifuge mother liquor water. The mother liquor is characterized by large quantity and higher CODcr index (100-300 mg/L), but the overall water quality index is superior to that of industrial water, the CODcr content of the existing PVC industry centrifugal mother liquor after biochemical treatment is still high, the subsequent water preparation process direct high-efficiency recycling (high CODcr content and blockage of a water preparation device) cannot be met, and the mother liquor is only used for supplementing water to circulating water after simple treatment or is discharged after being led to a sewage station for dilution. As the centrifugal mother liquor after biochemical treatment contains a large amount of microorganisms and bacteria, the centrifugal mother liquor is used as circulating water supplementing water, which can cause corrosion or scaling of heat exchange equipment and affect the heat exchange effect and the service life. Directly discharged or discharged after being diluted by a sewage station, the water has higher quality and higher flow, and only the CODcr content exceeds the standard, so that the discharge can cause the increase of the PVC manufacturing cost.
In the industry, although some manufacturers try to adopt equipment such as a pool/groove with a concrete structure to introduce ozone gas for reaction, a series of problems such as uneven reaction, poor effect, large occupied area of the device, heavy environmental pollution and the like cannot be solved because the equipment is simple, the process is extensive, no water and gas distribution device is arranged, and the concrete equipment such as the pool/groove cannot be sealed.
Disclosure of Invention
Aiming at the technical problems, the utility model aims to provide a reaction tower for treating PVC centrifugal mother liquor, which solves the problems that the centrifugal mother liquor in the polyvinyl chloride industry has high CODcr content after biochemical treatment at present, can not meet the direct and efficient reuse (the blockage of a water production device caused by the high CODcr content) of a subsequent water production process, and is only used for supplementing water to circulating water after simple treatment or is discharged after being led to a sewage station for dilution.
The utility model adopts the technical scheme that:
the reaction tower for treating the PVC centrifugal mother liquor comprises a reaction tower body, a liquid distribution device, a gas distribution device and a catalytic device, wherein the liquid distribution device comprises a liquid inlet pipe, the liquid inlet pipe extends into the bottom of the reaction tower from the top of the reaction tower, the tail end of the liquid inlet pipe is provided with a liquid distribution pipe, and a plurality of liquid distribution spray heads are arranged on the liquid distribution pipe; the gas distribution device comprises a gas inlet pipe, the gas inlet pipe extends into the bottom of the reaction tower from the top of the reaction tower, a gas distribution pipe is arranged at the tail end of the gas inlet pipe, the gas distribution pipe is arranged below the liquid distribution pipe, and a plurality of gas distribution spray heads are arranged on the gas distribution pipe; the catalytic device is arranged above the liquid distribution pipe and comprises an upper grid screen and a lower grid screen, an ozone catalytic layer is arranged between the upper grid screen and the lower grid screen, ozone catalyst particles are filled in the ozone catalytic layer, and a stirring device is arranged in the ozone catalytic layer.
The utility model discloses a reaction tower, including the inlet pipe, the inlet pipe is equipped with the air inlet governing valve in, reaction tower upper portion is equipped with the drain pipe, the drain pipe is equipped with CODcr detection device, CODcr detection device links with the air inlet governing valve.
The stirring device comprises stirring blades and a stirring shaft which are arranged in the ozone catalytic layer, and the stirring shaft is connected to a stirring motor outside the reaction tower. The height of the reaction tower is 8-10m, and the height of the ozone catalytic layer is 2.5-4.0m.
And the liquid inlet pipe is provided with a water inlet valve and a water inlet pump. The air inlet pipe is connected with the ozone generating device. The top of the reaction tower is provided with a tail gas outlet, and the bottom of the reaction tower is provided with a drain. And a manhole is arranged on the reaction tower.
The beneficial technical effects of the utility model are as follows:
according to the utility model, the sealed ozone reaction tower is arranged at the rear end of biochemical treatment of the PVC centrifugal mother liquor, so that the oxidation reaction rate of CODcr in water is increased, the content of CODcr is reduced, the requirement of a subsequent water production process index (the content of CODcr is less than or equal to 10 PPm) is met, and reaction equipment is provided for efficient and complete recycling of the centrifugal mother liquor.
The utility model realizes automatic regulation and control of the whole process, has simple operation, effectively reduces CODcr content index (CODcr content is less than or equal to 10 PPm) in the centrifugal mother liquor, has good sealing performance of equipment, is advanced and reliable in water distribution and gas distribution device, is not easy to block, is provided with an ozone catalytic device to promote reaction rate, and reaction tail gas is delivered to a tail gas treatment device for treatment in a sealing way through a pipeline without site pollution phenomenon, and the effluent of a reaction tower is filtered and then delivered to desalted water produced in a subsequent water production process for recycling to a polyvinyl chloride system, thereby effectively reducing the cost of the desalted water and providing desalted water with high quality and low price for polyvinyl chloride production. Especially can be widely popularized and applied in polyvinyl chloride production systems.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
in the figure, a 1-reaction tower body, a 2-liquid inlet pipe, a 3-liquid distribution pipe, a 4-liquid distribution spray nozzle, a 5-water inlet valve, a 6-air inlet pipe, a 7-gas distribution pipe, an 8-gas distribution spray nozzle, a 9-upper grid screen, a 10-lower grid screen, an 11-ozone catalytic layer, 12-stirring blades, a 13-stirring shaft, a 14-stirring motor, a 15-air inlet regulating valve, a 16-liquid outlet pipe, a 17-CODcr detection device, an 18-tail gas outlet, a 19-exhaust outlet and a 20-manhole.
Detailed Description
As shown in figure 1, a reaction tower for treating PVC centrifugal mother liquor comprises a reaction tower body 1, a liquid distribution device, a gas distribution device and a catalytic device, wherein the liquid distribution device comprises a liquid inlet pipe 2, the liquid inlet pipe 2 stretches into the bottom of the reaction tower from the top of the reaction tower, the tail end of the liquid inlet pipe 2 is provided with a liquid distribution pipe 3, a plurality of liquid distribution spray heads 4 are arranged on the liquid distribution pipe 3, and a water inlet valve 5 and a water inlet pump are arranged on the liquid inlet pipe 2. The gas distribution device comprises a gas inlet pipe 6, the gas inlet pipe 6 extends into the bottom of the reaction tower from the top of the reaction tower, the tail end of the gas inlet pipe 6 is provided with a gas distribution pipe 7, the gas distribution pipe 7 is arranged below the liquid distribution pipe 3, and a plurality of gas distribution spray heads 8 are arranged on the gas distribution pipe 7; the catalytic device is arranged above the liquid distribution pipe 3 and comprises an upper grid screen 9 and a lower grid screen 10, an ozone catalytic layer 11 is arranged between the upper grid screen 9 and the lower grid screen 10, ozone catalytic layer 11 is filled with ozone catalytic particles, the purchased conventional ozone catalytic particles with the particle size of 3-5 mm are arranged in the ozone catalytic layer, a stirring device is arranged in the ozone catalytic layer and comprises stirring blades 12 and a stirring shaft 13 which are arranged in the ozone catalytic layer, and the stirring shaft is connected to a stirring motor 14 outside the reaction tower.
The air inlet pipe 6 is connected with an ozone generating device, an air inlet regulating valve 15 is arranged on the air inlet pipe 6, a liquid outlet pipe 16 is arranged on the upper portion of the reaction tower, a CODcr detecting device 17 is arranged on the liquid outlet pipe, and the CODcr detecting device 17 is interlocked with the air inlet regulating valve 15. The height of the reaction tower is 8-10m, the diameter is 4-6m, and the height of the ozone catalytic layer is 2.5-4.5m. The top of the reaction tower is provided with a tail gas outlet 18 for discharging the tail gas after the reaction. The bottom of the reaction tower is provided with a drain 19, and the reaction tower is provided with a manhole 20.
The reaction tower uses the principle: after biochemical treatment, the centrifugal mother liquor from the production of polyvinyl chloride by a calcium carbide method enters a reaction tower, and the centrifugal mother liquor is uniformly ejected out through a liquid distribution nozzle in a water distribution device under the pressure effect; ozone is evenly ejected through a gas distribution nozzle in a gas distribution device under the pressure effect, water and gas are subjected to oxidation reaction in the evenly rising process due to the fact that a centrifugal mother liquor tower is higher, and when the ozone passes through an ozone catalytic layer, the reaction is accelerated under the effect of a catalyst, the oxidation reaction is more violent in progress, the decomposition is more thorough, water and gas enter at the bottom of the tower, the stay time of the water and the gas in the tower is longer than 2 hours, and the size of the ozone air inflow is adjusted through CODcr on-line analysis data of a liquid outlet. After the equipment runs for 72 hours, a catalyst stirring device is started to stir and regenerate the catalyst particles, impurities loaded on the surfaces of the catalyst particles are removed through stirring, the catalytic effect is ensured, effluent from a liquid outlet pipe enters a subsequent filtering system, and tail gas enters a tail gas treatment device.
The utility model utilizes the strong oxidation characteristic of ozone, can efficiently degrade phenols, ethers, PVA, polyvinyl chloride and other organic polymer substances in mother liquor water, finally is decomposed into water and carbon dioxide, no secondary impurity is brought in, after the water is subjected to precise filtration, the produced water CODcr can be stably controlled below 10mg/L, the requirement of secondary reverse osmosis recycling is met, and after the water is subjected to secondary reverse osmosis and mixed bed treatment, the water meets the use standard of the polyvinyl chloride polymerization desalted water. The reaction tower has good sealing performance, avoids the situation of on-site ozone pollution, is beneficial to safe civilized production, effectively saves the production cost of PVC resin, and can be widely popularized and applied in the polyvinyl chloride industry.
The use flow is as follows:
starting a water inlet pump and a water inlet valve, injecting the biochemical treated centrifugal mother liquor into the tower through a liquid inlet pipe, uniformly injecting the biochemical treated centrifugal mother liquor through a liquid distribution nozzle in a water distribution device under the pressure effect, starting an ozone generating device when water flows out from a liquid outlet at the upper part of the reaction tower, uniformly injecting ozone through a gas distribution nozzle in a gas distribution device under the pressure effect, slowly lifting ozone concentration along with the lifting of the power of the ozone generating device, putting an air inlet regulating valve into an automatic mode when the online analysis data of a liquid outlet CODcr detector is less than or equal to 10PPm, carrying out oxidation reaction on water and gas in the uniform lifting process, enabling the oxidation reaction to be more thorough by an ozone catalytic layer, continuously operating the equipment for 72 hours, automatically starting the stirring device to automatically operate through a timer, realizing automatic regeneration of a catalyst, and ensuring the catalytic effect.
Claims (8)
1. A reaction tower for handling PVC centrifugation mother liquor, its characterized in that: the liquid distribution device comprises a liquid inlet pipe, wherein the liquid inlet pipe extends into the bottom of the reaction tower from the top of the reaction tower, the liquid distribution pipe is arranged at the tail end of the liquid inlet pipe, and a plurality of liquid distribution spray heads are arranged on the liquid distribution pipe; the gas distribution device comprises a gas inlet pipe, the gas inlet pipe extends into the bottom of the reaction tower from the top of the reaction tower, a gas distribution pipe is arranged at the tail end of the gas inlet pipe, the gas distribution pipe is arranged below the liquid distribution pipe, and a plurality of gas distribution spray heads are arranged on the gas distribution pipe; the catalytic device is arranged above the liquid distribution pipe and comprises an upper grid screen and a lower grid screen, an ozone catalytic layer is arranged between the upper grid screen and the lower grid screen, ozone catalyst particles are filled in the ozone catalytic layer, and a stirring device is arranged in the ozone catalytic layer.
2. A reaction tower for treating PVC centrifugal mother liquor according to claim 1, wherein: the utility model discloses a reaction tower, including the inlet pipe, the inlet pipe is equipped with the air inlet governing valve in, reaction tower upper portion is equipped with the drain pipe, the drain pipe is equipped with CODcr detection device, CODcr detection device links with the air inlet governing valve.
3. A reaction tower for treating PVC centrifugal mother liquor according to claim 1, wherein: the stirring device comprises stirring blades and a stirring shaft which are arranged in the ozone catalytic layer, and the stirring shaft is connected to a stirring motor outside the reaction tower.
4. A reaction tower for treating PVC centrifugal mother liquor according to claim 1, wherein: the height of the reaction tower is 8-10m, and the height of the ozone catalytic layer is 2.5-4m.
5. A reaction tower for treating PVC centrifugal mother liquor according to claim 1, wherein: and the liquid inlet pipe is provided with a water inlet valve and a water inlet pump.
6. A reaction tower for treating PVC centrifugal mother liquor according to claim 1, wherein: the air inlet pipe is connected with the ozone generating device.
7. A reaction tower for treating PVC centrifugal mother liquor according to claim 1, wherein: the top of the reaction tower is provided with a tail gas outlet, and the bottom of the reaction tower is provided with a drain.
8. A reaction tower for treating PVC centrifugal mother liquor according to claim 1, wherein: and a manhole is arranged on the reaction tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223232869.8U CN219058674U (en) | 2022-12-04 | 2022-12-04 | Reaction tower for treating PVC centrifugal mother liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223232869.8U CN219058674U (en) | 2022-12-04 | 2022-12-04 | Reaction tower for treating PVC centrifugal mother liquor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219058674U true CN219058674U (en) | 2023-05-23 |
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ID=86348120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223232869.8U Active CN219058674U (en) | 2022-12-04 | 2022-12-04 | Reaction tower for treating PVC centrifugal mother liquor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219058674U (en) |
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2022
- 2022-12-04 CN CN202223232869.8U patent/CN219058674U/en active Active
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