CN214233475U - Waste gas treatment system for sewage treatment station - Google Patents
Waste gas treatment system for sewage treatment station Download PDFInfo
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- CN214233475U CN214233475U CN202023195572.XU CN202023195572U CN214233475U CN 214233475 U CN214233475 U CN 214233475U CN 202023195572 U CN202023195572 U CN 202023195572U CN 214233475 U CN214233475 U CN 214233475U
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Abstract
The utility model provides a waste gas treatment system for sewage treatment station mainly includes pipeline formula defroster, one-level scrubbing tower, second grade scrubbing tower, heating device, ozone catalytic oxidation tower, ozone generator and air supply, pipeline formula defroster, one-level scrubbing tower, second grade scrubbing tower, heating device and ozone catalytic oxidation tower pass through the pipeline and connect gradually, the air supply with ozone generator passes through the pipe connection, ozone generator with ozone catalytic oxidation tower passes through the pipe connection, the utility model discloses waste gas treatment system can be applicable to by the water smoke that the sewage treatment station produced contain water smoke, contain acidic gas, contain alkaline gas and contain the site of compound pollution such as VOCs, have characteristics such as application scope extensively, relative low cost, degree of automation height.
Description
Technical Field
The utility model belongs to the waste gas treatment field relates to a waste gas treatment system for sewage treatment station particularly.
Background
In a sewage treatment station, microorganisms are generally utilized to degrade organic pollutants in wastewater, wherein certain sulfur-containing compounds and nitrogen-containing compounds can be converted into volatile malodorous components such as hydrogen sulfide, ammonia nitrogen and the like under the action of the microorganisms, and the pollutants are one of main sources of acidic gases or alkaline gases in sewage treatment; in addition, during the treatment of sewage stations, certain easily volatile components or intermediates are released into the atmosphere, resulting in exhaust gas containing volatile organic compounds such as methyl mercaptan, methyl sulfide and the like. Therefore, the waste gas of the sewage station usually contains a plurality of components such as acid gas, alkaline gas, VOCs and the like, and has the characteristics of high moisture content of the waste gas and the like.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a waste gas treatment system for sewage treatment station, this system can make and contain acid gas, alkaline gas and VOCs to the complicated waste gas of moisture content ratio height is effectively got rid of.
The above object of the present invention can be achieved by the following technical solutions: an exhaust treatment system for a sewage treatment plant, comprising:
the pipeline type demister is used for removing liquid water drops, acid-base gases capable of being dissolved in water and part of VOCs in the waste gas;
the primary washing tower is an acid washing tower or an alkali washing tower and is used for removing acid gas or alkaline gas in the waste gas;
the secondary washing tower is an alkaline washing tower or an acid washing tower and is used for removing alkaline gas or acid gas in the waste gas;
the heating device is used for maintaining the temperature of the waste gas or the ozone catalytic oxidation tower;
the ozone catalytic oxidation tower is used for removing VOCs in the waste gas;
the ozone generator is used for providing ozone for the ozone catalytic oxidation tower;
the gas source is used for providing gas for generating ozone for the ozone generator;
the pipeline type demister, the primary washing tower, the secondary washing tower, the heating device and the ozone catalytic oxidation tower are sequentially connected through a pipeline, the air source is connected with the ozone generator through a pipeline, and the ozone generator is connected with the ozone catalytic oxidation tower through a pipeline.
Preferably, the pipeline type demister is of a vertical structure, a waste gas inlet is formed in the top of the pipeline type demister, swirl blades are arranged in the pipeline type demister, a liquid collecting tank is arranged at the bottom of the pipeline type demister, and a waste gas outlet connected to the gas inlet of the primary washing tower is formed in the side of the pipeline type demister.
Preferably, the primary scrubber and the secondary scrubber are packed scrubbers for removing acid or alkaline gases.
Furthermore, a wire mesh demister is arranged at the top of the filler washing tower.
Furthermore, a liquid level meter and an on-line monitor for detecting pH value, temperature, conductivity or COD are also arranged in the first-stage washing tower and the second-stage washing tower.
Preferably, the heating device is a dividing wall type heat exchanger, a fuel heater or an electric heater.
Optionally, the heating device and the ozone catalytic oxidation tower are integrally arranged or separately arranged.
Preferably, an ozone catalyst bed layer for oxidizing VOCs and an ozone elimination catalyst bed layer for digesting residual ozone are arranged in the catalytic oxidation tower.
Compared with the prior art, the utility model has the advantages of it is following:
(1) the waste gas treatment system of the utility model can be applied to the places with composite pollution such as water mist, acid gas, alkaline gas and VOCs generated by a sewage treatment station, and has the characteristics of wide application range, low relative cost, high automation degree and the like;
(2) the pipeline type demister adopts a three-dimensional structure, does not need to increase the plane position, is internally provided with the spiral-flow type guide vane, can throw away fog drops in waste gas under the action of centrifugal force, smoothly removes components dissolved in the waste gas, and reduces the acid dosage, alkali dosage and ozone dosage of the subsequent process;
(3) the utility model provides an ozone catalytic oxidation tower can realize the oxidation to the pollutant under 10 ~ 150 ℃ lower temperature according to different organic matter components, ozone catalyst bed, and ozone elimination catalyst bed can ensure that remaining ozone obtains the degradation.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an exhaust treatment system for a wastewater treatment plant in accordance with an embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
Example 1
As shown in fig. 1, an exhaust gas treatment system for a sewage treatment station mainly includes:
the pipeline type demister is used for removing liquid water drops, acid-base gases capable of being dissolved in water and part of VOCs in the waste gas;
the primary washing tower is an acid washing tower or an alkali washing tower and is used for removing acid gas or alkaline gas in the waste gas;
the secondary washing tower is an alkaline washing tower or an acid washing tower and is used for removing alkaline gas or acid gas in the waste gas;
the heating device is used for maintaining the temperature of the waste gas or the ozone catalytic oxidation tower;
the ozone catalytic oxidation tower is used for removing VOCs in the waste gas;
the ozone generator is used for providing ozone for the ozone catalytic oxidation tower;
and the gas source is used for providing gas for generating ozone for the ozone generator.
The device comprises a pipeline type demister, a primary washing tower, a secondary washing tower, a heating device and an ozone catalytic oxidation tower, wherein the pipeline type demister, the primary washing tower, the secondary washing tower, the heating device and the ozone catalytic oxidation tower are sequentially connected through pipelines, and the ozone generator, an air source and the ozone catalytic oxidation tower are connected with one another.
The pipeline type demister is of a vertical structure, a waste gas inlet is formed in the top of the pipeline type demister, swirl blades are arranged in the pipeline type demister, a liquid collecting tank is arranged at the bottom of the pipeline type demister, and a waste gas outlet connected to the gas inlet of the primary washing tower is formed in the side of the pipeline type demister.
The pipeline type demister is mainly used for removing liquid water drops in waste gas, removing acid-base gas and partial VOCs which can be dissolved in water in a sequential mode, and reducing the dosage of a subsequent process.
The pipeline demister can also be provided with a flushing pipeline for cleaning the cyclone blades, and the bottom liquid collecting tank can also be provided with an automatic emptying valve and a liquid level meter for discharging collected waste liquid at regular time.
The concrete structure of the pipe-type demister can be referred to patents CN210448645U and CN 210448646U.
Preferably, the pipeline type demister is of a vertical structure, waste gas flows through the pipeline type demister from top to bottom, high-speed centrifugal acting force is generated under the flow guiding effect of the cyclone blades, liquid fog drops are thrown onto the wall of the pipeline, and finally the liquid fog drops are collected in a liquid collecting tank at the bottom. The side of the pipeline type demister is provided with a waste gas outlet which is connected to an air inlet of a pickling tower (a primary washing tower), and a liquid collecting tank at the bottom is provided with an automatic liquid discharging valve for discharging waste liquid at regular time; the guide vane is provided with a flushing pipeline for flushing impurities adhered to the vane.
The first-stage washing tower and the second-stage washing tower are filler washing towers for removing acid gas or alkaline gas.
And a wire mesh demister is also arranged at the top of the packing washing tower.
The first-stage washing tower and the second-stage washing tower are respectively used for removing acid gas or alkaline gas in the waste gas.
The air velocity of an empty tower of the filler washing tower is 0.5-1.5 m/s, the residence time of the empty tower is 2-10 s, the liquid-gas ratio is 2-10L/m 3, and the top of the empty tower is provided with a wire mesh demister with the thickness of 100-400 mm.
The first-stage washing tower and the second-stage washing tower are also internally provided with a liquid level meter and an on-line monitor for detecting pH value, temperature, conductivity or COD.
The first-stage washing tower and the second-stage washing tower are provided with online monitors and liquid level meters for pH, temperature, conductivity, COD and the like according to actual requirements, wherein the pH and temperature meters can be interlocked with a dosing pump in the packed tower to control the pH value and the temperature of the circulating water tank; the conductivity, COD and liquid level meter can be interlocked with a water replenishing valve and an emptying valve of the packed tower to empty waste water and replenish fresh primary water.
When the first-stage washing tower is an acid washing tower, a conventional packed tower is adopted, and alkaline gas in waste gas is neutralized by acid by utilizing the principle of chemical absorption. The bottom of the packing tower is provided with a circulating water tank, the middle part of the packing tower is provided with a packing and spraying layer, and the top of the packing tower is provided with a 150mm pp wire mesh defogging layer. And a circulating water pump is arranged outside the packed tower, and a pH and temperature probe is arranged at the outlet of the circulating water pump and used for monitoring the pH and temperature of the circulating water tank in real time and interlocking with the acid adding pump. When the pH value is higher than a set value, starting an acid adding pump, and adding acid into the circulating water tank; when the pH is lower than the set value, the acid addition is stopped. The pickling tower is provided with an automatic water replenishing valve, the water is replenished to the circulating water tank at regular time, and redundant wastewater is discharged to the trench through the overflow port.
When the secondary washing tower is an alkaline washing tower, a packed tower is also adopted, and the acidic gas in the waste gas is neutralized by alkali by utilizing the principle of chemical absorption. The structural form and the control mode of the alkaline tower are similar to those of the acid tower. The outlet of the circulating water pump of the alkaline tower is also provided with a pH and temperature probe which is used for monitoring the pH and the temperature in the circulating water tank in real time and is linked with the alkaline pump. When the pH value in the circulating water tank is lower than a set value, starting an alkali adding pump; and when the pH value is higher than the set value, stopping the alkali adding pump.
The heating device is a dividing wall type heat exchanger, a fuel heater or an electric heater.
In particular, the heating means may be indirect heating, such as a dividing wall heat exchanger; or may be direct heating such as fuel heating (e.g., natural gas heater, liquefied petroleum gas heater, hydrogen heater, or biogas heater, etc.) or electric heating, etc.
Specifically, the heating device adopts a plate heat exchanger, the heat source is steam, and waste gas exchanges heat with high-temperature steam when passing through the plate heat exchanger, so that the waste gas is heated to a set temperature.
Furthermore, an adjusting valve is arranged on a water vapor pipeline of the plate heat exchanger, a thermometer is arranged on a waste gas outlet pipeline, and the thermometer is linked with the adjusting valve. When the temperature of the outlet gas is lower than a set value, the steam quantity is increased; and when the outlet temperature is higher than a set value, reducing the steam amount.
The heating device can be arranged integrally or separately with the ozone catalytic oxidation tower.
When the heating device and the ozone catalytic oxidation tower are integrally arranged, the heating device can also directly heat the ozone catalyst bed layer of the catalytic oxidation tower.
An ozone catalyst bed layer for oxidizing VOCs and an ozone elimination catalyst bed layer for digesting residual ozone are arranged in the catalytic oxidation tower.
Specifically, the ozone catalytic oxidation tower is provided with two layers of catalysts, wherein a precious metal catalyst bed layer for catalytic oxidation of ozone is filled at the bottom, and an ozone elimination catalyst bed layer for elimination of ozone is filled at the top.
The air source of the ozone generator for providing ozone for the ozone catalytic oxidation tower can be an air source or an oxygen source. The mass ratio of the ozone adding amount to the air inlet VOCs is 1-10: 1.
the optimal temperature for eliminating VOCs in the ozone catalytic oxidation tower is 10-150 ℃.
Specifically, the ozone generator adopts an air source, and the pretreated clean air is converted into ozone when passing through a high-pressure area of the ozone generator, is introduced into the ozone oxidation tower and participates in degrading VOCs in the waste gas.
Furthermore, a washing tower can be added after the ozone oxidation tower to remove the residual pollution components.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the scope of the invention. Any person skilled in the art can make some modifications without departing from the scope of the invention, i.e. all equivalent modifications made according to the invention are intended to be covered by the scope of the invention.
Claims (8)
1. An exhaust treatment system for a sewage treatment plant, comprising:
a pipe-type demister;
the primary washing tower is an acid washing tower or an alkali washing tower and is used for removing acid gas or alkaline gas in the waste gas;
the secondary washing tower is an alkaline washing tower or an acid washing tower and is used for removing alkaline gas or acid gas in the waste gas;
the heating device is used for maintaining the temperature of the waste gas or the ozone catalytic oxidation tower;
the ozone catalytic oxidation tower is used for removing VOCs in the waste gas;
the ozone generator is used for providing ozone for the ozone catalytic oxidation tower;
the gas source is used for providing gas for generating ozone for the ozone generator;
the pipeline type demister, the primary washing tower, the secondary washing tower, the heating device and the ozone catalytic oxidation tower are sequentially connected through a pipeline, the air source is connected with the ozone generator through a pipeline, and the ozone generator is connected with the ozone catalytic oxidation tower through a pipeline.
2. The exhaust treatment system for a sewage treatment plant of claim 1, wherein: the pipeline type demister is of a vertical structure, a waste gas inlet is formed in the top of the pipeline type demister, swirl vanes are arranged in the pipeline type demister, a liquid collecting tank is arranged at the bottom of the pipeline type demister, and a waste gas outlet connected to the gas inlet of the primary washing tower is formed in the side of the pipeline type demister.
3. The exhaust treatment system for a sewage treatment plant of claim 1, wherein: the primary scrubber and the secondary scrubber are packed scrubbers for removing acid or alkaline gases.
4. The exhaust treatment system for a sewage treatment plant of claim 3, wherein: and a wire mesh demister is also arranged at the top of the packing washing tower.
5. The exhaust treatment system for a sewage treatment plant of claim 3, wherein: the first-stage washing tower and the second-stage washing tower are also internally provided with a liquid level meter and an online monitor for detecting pH value, temperature, conductivity or COD.
6. The exhaust treatment system for a sewage treatment plant of claim 1, wherein: the heating device is a dividing wall type heat exchanger, a fuel heater or an electric heater.
7. The exhaust treatment system for a sewage treatment plant of claim 1, wherein: the heating device and the ozone catalytic oxidation tower are arranged integrally or separately.
8. The exhaust treatment system for a sewage treatment plant of claim 1, wherein: an ozone catalyst bed layer for oxidizing VOCs and an ozone elimination catalyst bed layer for digesting residual ozone are arranged in the catalytic oxidation tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023195572.XU CN214233475U (en) | 2020-12-25 | 2020-12-25 | Waste gas treatment system for sewage treatment station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023195572.XU CN214233475U (en) | 2020-12-25 | 2020-12-25 | Waste gas treatment system for sewage treatment station |
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| Publication Number | Publication Date |
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| CN214233475U true CN214233475U (en) | 2021-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023195572.XU Active CN214233475U (en) | 2020-12-25 | 2020-12-25 | Waste gas treatment system for sewage treatment station |
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| CN (1) | CN214233475U (en) |
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