CN212017362U - System for treating waste gas - Google Patents

System for treating waste gas Download PDF

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Publication number
CN212017362U
CN212017362U CN201921317152.9U CN201921317152U CN212017362U CN 212017362 U CN212017362 U CN 212017362U CN 201921317152 U CN201921317152 U CN 201921317152U CN 212017362 U CN212017362 U CN 212017362U
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China
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valve
circulating liquid
automatic controller
electrically connected
shell
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CN201921317152.9U
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秦学礼
张群
林东安
徐刚
彭定志
孙孝宏
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China Electronics Engineering Design Institute Co Ltd
SY Technology Engineering and Construction Co Ltd
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China Electronics Engineering Design Institute Co Ltd
SY Technology Engineering and Construction Co Ltd
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Abstract

The utility model relates to a waste gas treatment field, in particular to system for handle waste gas. The system for treating exhaust gas includes: the device is used for nitric oxide oxidation, nitrogen dioxide reduction and acid exhaust gas treatment from upstream to downstream.

Description

System for treating waste gas
The utility model discloses require application number 201920906840.2, the name of utility model's priority of wet processing nitrogen oxide waste gas' that 2019 was submitted 6 month 17 day.
Technical Field
The utility model relates to a waste gas treatment field, in particular to system for handle waste gas.
Background
Currently, the mainstream products in the electronic industry are semiconductor chips and display devices, and Nitrogen Oxides (NO) are generated in the processes of cleaning, Chemical Vapor Deposition (CVD), and the like in the production processX) In addition, some high temperature oxidation processes also produce NOX。NOXIs an important cause of photochemical smog and acid rain, NOXIt also irritates the lungs, and long-term inhalation can seriously affect human health.
The adsorption method has high NOx removing efficiency. But due to the limitation of the adsorption capacity of the adsorbent, if NO in the exhaust gasXThe concentration is high, the amount of the adsorbent is large, and the adsorbent needs to be replaced periodically after saturation, so that the treatment equipment adopting the adsorption method has the problems of large equipment, high cost, incapability of automatic control, large operation and maintenance workload and the like. In addition, when the adsorbent is close to saturation, the treatment efficiency decreases, causing instability in the efficiency of treating NOx.
SUMMERY OF THE UTILITY MODEL
The utility model provides a system for handle waste gas.
According to an aspect of the present invention, a system is provided comprising: the nitrogen monoxide oxidation device 11 and the nitrogen dioxide reduction and acid exhaust gas treatment device 21 are arranged from the upstream to the downstream in sequence.
According to an embodiment of the present invention, the system further comprises an air intake duct 41, an air exhaust device 31 and an air exhaust duct 51; the exhaust device 31 is arranged at the downstream of the nitrogen dioxide reduction and acid exhaust gas treatment device 21, and the exhaust pipeline 51 is arranged at the downstream of the exhaust device 31; the intake duct 41 is provided upstream of the nitrogen monoxide oxidation device 11 and is connected to the nitrogen monoxide oxidation device 11.
According to an embodiment of the present invention, the nitric oxide oxidation apparatus 11 comprises a housing 1011, a spray port 1201, a circulating liquid storage 1211, a circulating liquid pump 1041, a liquid level meter 1051, an oxidation-reduction potential meter 1061, a conductivity meter 1071, an oxidant supply pipe 1311, a water replenishing pipe 1321, a drain pipe 1331, a first valve 1081 for controlling the replenishing of the oxidant solution, a second valve 1091 for controlling the replenishing of the water, a third valve 1101 for controlling the discharge of the sewage, an automatic controller 1111, a gas inlet 1411 for the entry of the nitrogen oxide waste gas, a gas outlet 1421 for discharging the treated waste gas, and a circulating liquid collection port 1431;
the spraying port 1201 is arranged in the outer shell 1011, the gas inlet 1411 is arranged on the upstream of the outer shell 1011, and the gas outlet 1421 is arranged on the downstream of the outer shell 1011; a circulating liquid collecting port 1431 is arranged between the outer shell 1011 and the circulating liquid storage 1211, and the circulating liquid pump 1041 pumps the circulating liquid in the circulating liquid storage 1211 into the outer shell 1011 from the spraying port 1201;
the circulating liquid storage 1211 is connected to the liquid level meter 1051, the oxidation-reduction potentiometer 1061 and the conductivity meter 1071, respectively, the automatic controller 1111 is electrically connected to the liquid level meter 1051, the automatic controller 1111 is electrically connected to the second valve 1091, the automatic controller 1111 is electrically connected to the oxidation-reduction potentiometer 1061, the automatic controller 1111 is electrically connected to the first valve 1081, the automatic controller 1111 is electrically connected to the conductivity meter 1071, and the automatic controller 1111 is electrically connected to the third valve 1101; the first valve 1081 is disposed on the oxidizer supply pipe 1311, the second valve 1091 is disposed on the supplementary water pipe 1321, and the third valve 1101 is disposed on the drain pipe 1331.
According to an embodiment of the present invention, the nitric oxide oxidation device 11 further comprises a filler layer 1021 and a defogging layer 1031 fixed inside the housing 1011, wherein the filler layer 1021 is located upstream of the defogging layer 1031.
According to an embodiment of the present invention, the nitrogen dioxide reduction and acid exhaust gas treatment device 21 includes a housing 2011, a spray port 2201, a circulating liquid storage 2211, a circulating liquid pump 2041, a liquid level meter 2051, an oxidation-reduction potentiometer 2061, a conductivity meter 2071, a pH tester 2121, a reducing agent supply pipe 2311, a water supplementing pipe 2321, a sewage draining pipe 2331, a sodium hydroxide supply pipe 2341, a first valve 2081 for controlling the supplementation of a reducing agent solution, a second valve 2091 for controlling the supplementation, a third valve 2101 for controlling the discharge of sewage, a fourth valve 2131 for controlling the supplementation of a sodium hydroxide solution, an automatic controller 2111, a gas inlet 2411 for the entry of the exhaust gas treated by the nitric oxide oxidation device 11, a gas outlet 2421 for discharging the treated exhaust gas, and a circulating liquid collecting port 2431;
the spraying port 2201 is arranged in the shell 2011, the gas inlet 2411 is arranged at the upstream of the shell 2011, and the gas outlet 2421 is arranged at the downstream of the shell 2011; a circulating liquid collecting port 2431 is arranged between the housing 2011 and the circulating liquid storage 2211, and the circulating liquid pump 2041 pumps the circulating liquid in the circulating liquid storage 2211 into the housing 2011 from the spraying port 2201;
the circulating liquid storage 2211 is respectively connected with the four liquid level meter 2051, the oxidation-reduction potentiometer 2061, the conductivity meter 2071 and the pH value tester 2121, the automatic controller 2111 is electrically connected with the liquid level meter 2051, the automatic controller 2111 is electrically connected with the second valve 2091, the automatic controller 2111 is electrically connected with the oxidation-reduction potentiometer 2061, the automatic controller 2111 is electrically connected with the first valve 2081, the automatic controller 2111 is electrically connected with the conductivity meter 2071, the automatic controller 2111 is electrically connected with the third valve 2101, the automatic controller 2111 is electrically connected with the pH value tester 2121, and the automatic controller 2111 is electrically connected with the fourth valve 2131; the first valve 2081 is disposed on the reducing agent supply pipe 2311, the second valve 2091 is disposed on the water supplement pipe 2321, the third valve 2101 is disposed on the sewage discharge pipe 2331, and the fourth valve 2131 is disposed on the sodium hydroxide supply pipe 2341.
According to an embodiment of the present invention, the nitrogen dioxide reduction and acid exhaust gas treatment device 21 further comprises a packing layer 2021 and a defogging layer 2031 fixed inside the housing 2011, wherein the packing layer 2021 is located at the upstream of the defogging layer 2031.
According to an embodiment of the present invention, the nitrogen monoxide oxidation device 11 is vertical or horizontal, and the nitrogen dioxide reduction and acid exhaust gas treatment device 21 is vertical or horizontal.
According to an embodiment of the present invention, the nitrogen monoxide oxidation device 11 and the nitrogen dioxide reduction and acid exhaust gas treatment device 21 are vertical.
According to an embodiment of the present invention, the nitrogen monoxide oxidation device 11 and the nitrogen dioxide reduction and acid exhaust gas treatment device 21 are horizontal.
According to another aspect of the present invention, there is provided a system in which the nitrogen dioxide reduction and acid exhaust gas treatment device 21 includes: a nitrogen dioxide reduction device 2 and an acid exhaust gas treatment device 3 which are arranged in sequence from upstream to downstream.
According to an embodiment of the present invention, the system further comprises a nitric oxide oxidation device 1 arranged upstream of the nitrogen dioxide reduction device 2.
According to an embodiment of the present invention, the system further comprises an air intake duct 5, an air exhaust device 4 and an air exhaust duct 6; the exhaust device 4 is arranged at the downstream of the acidic waste gas treatment device 3, and the exhaust pipeline 6 is arranged at the downstream of the exhaust device 4; the air inlet pipe 5 is arranged at the upstream of the nitric oxide oxidation device 1 and is connected with the nitric oxide oxidation device 1.
According to an embodiment of the present invention, the nitric oxide oxidation apparatus 1 includes a housing 101, a spray opening 120, a circulating liquid storage 121, a circulating liquid pump 104, a liquid level meter 105, an oxidation-reduction potential meter 106, a conductivity meter 107, an oxidant supply pipe 131, a water replenishing pipe 132, a drain pipe 133, a first valve 108 for controlling the replenishment of an oxidant solution, a second valve 109 for controlling the replenishment of water, a third valve 110 for controlling the discharge of sewage, an automatic controller 111, a gas inlet 141 for the entry of nitrogen oxide waste gas, a gas outlet 142 for discharging the treated waste gas, and a circulating liquid collecting opening 143;
the spraying port 120 is arranged in the outer shell 101, the gas inlet 141 is arranged at the upstream of the outer shell 101, and the gas outlet 142 is arranged at the downstream; a circulating liquid collecting port 143 is arranged between the housing 101 and the circulating liquid storage 121, and the circulating liquid pump 104 pumps the circulating liquid in the circulating liquid storage 121 into the housing 101 through the spraying port 120;
the circulating liquid storage 121 is respectively connected with the liquid level meter 105, the oxidation-reduction potential meter 106 and the conductivity meter 107, the automatic controller 111 is electrically connected with the liquid level meter 105, the automatic controller 111 is electrically connected with the second valve 109, the automatic controller 111 is electrically connected with the oxidation-reduction potential meter 106, the automatic controller 111 is electrically connected with the first valve 108, the automatic controller 111 is electrically connected with the conductivity meter 107, and the automatic controller 111 is electrically connected with the third valve 110; the first valve 108 is disposed on the oxidant supply pipe 131, the second valve 109 is disposed on the water replenishing pipe 132, and the third valve 110 is disposed on the sewage drain pipe 133.
According to an embodiment of the present invention, the nitric oxide oxidation device 1 further comprises a filler layer 102 and a defogging layer 103 fixed inside the housing 101, wherein the filler layer 102 is located at the upstream of the defogging layer 103.
According to an embodiment of the present invention, the nitrogen dioxide reduction device 2 includes a housing 201, a spray outlet 220, a circulating liquid storage 221, a circulating liquid pump 204, a liquid level meter 205, an oxidation-reduction potentiometer 206, a conductivity meter 207, a reducing agent supply pipe 231, a water replenishing pipe 232, a drain pipe 233, a first valve 208 for controlling the replenishment of a reducing agent solution, a second valve 209 for controlling the replenishment, a third valve 210 for controlling the discharge of sewage, an automatic controller 211, a gas inlet 241 for the entry of the waste gas treated by the nitric oxide oxidation device 1, a gas outlet 242 for discharging the treated waste gas, and a circulating liquid collecting port 243;
the spraying port 220 is arranged in the shell 201, the gas inlet 241 is arranged at the upstream of the shell 201, and the gas outlet 242 is arranged at the downstream; a circulating liquid collecting port 243 is arranged between the shell 201 and the circulating liquid storage 221, and the circulating liquid pump 204 pumps the circulating liquid in the circulating liquid storage 221 into the shell 201 through the spraying port 220;
the circulating liquid storage 221 is connected to the liquid level meter 205, the oxidation-reduction potential meter 206, and the conductivity meter 207, respectively, the automatic controller 211 is electrically connected to the liquid level meter 205, the automatic controller 211 is electrically connected to the second valve 209, the automatic controller 211 is electrically connected to the oxidation-reduction potential meter 206, the automatic controller 211 is electrically connected to the first valve 208, the automatic controller 211 is electrically connected to the conductivity meter 207, and the automatic controller 211 is electrically connected to the third valve 210; the first valve 208 is disposed on the reducing agent supply pipe 231, the second valve 209 is disposed on the water replenishing pipe 232, and the third valve 210 is disposed on the sewage drain pipe 233.
According to an embodiment of the present invention, the nitrogen dioxide reduction device 2 further comprises a filler layer 202 and a defogging layer 203 fixed inside the housing 201, wherein the filler layer 202 is located at the upstream of the defogging layer 203.
According to an embodiment of the present invention, the acidic waste gas treatment device 3 comprises a housing 301, a spray port 320, a recycle liquid storage 321, a recycle liquid pump 304, a liquid level meter 305, a pH tester 306, a conductivity meter 307, a sodium hydroxide liquid supply pipe 331, a water replenishing pipe 332, a drain pipe 333, a first valve 308 for controlling the supply of sodium hydroxide solution, a second valve 309 for controlling the water replenishment, a third valve 310 for controlling the discharge of sewage, an automatic controller 311, a gas inlet 341 for the waste gas treated by the nitrogen dioxide reduction device 2 to enter, a gas outlet 342 for discharging the treated waste gas, and a recycle liquid collecting port 343;
the spraying port 320 is arranged in the outer shell 301, the gas inlet 341 is arranged at the upstream of the outer shell 301, and the gas outlet 342 is arranged at the downstream; a circulating liquid collecting port 343 is arranged between the outer shell 301 and the circulating liquid storage 321, and the circulating liquid pump 304 pumps the circulating liquid in the circulating liquid storage 321 into the outer shell 301 through the spraying port 320;
the circulating liquid storage 321 is connected to the liquid level meter 305, the pH meter 306, and the conductivity meter 307, respectively, the automatic controller 311 is electrically connected to the liquid level meter 305, the automatic controller 311 is electrically connected to the second valve 309, the automatic controller 311 is electrically connected to the pH meter 306, the automatic controller 311 is electrically connected to the first valve 308, the automatic controller 311 is electrically connected to the conductivity meter 307, and the automatic controller 311 is electrically connected to the third valve 310; the first valve 308 is disposed on the sodium hydroxide supply pipe 331, the second valve 309 is disposed on the water replenishing pipe 332, and the third valve 310 is disposed on the sewage pipe 333.
According to an embodiment of the present invention, the acidic exhaust gas treatment device 3 further comprises a packing layer 302 and a defogging layer 303 fixed inside the housing 301, wherein the packing layer 302 is located at the upstream of the defogging layer 303.
According to an embodiment of the present invention, the nitrogen monoxide oxidation device 1 is vertical or horizontal, the nitrogen dioxide reduction device 2 is vertical or horizontal, and the acid exhaust gas treatment device 3 is vertical or horizontal.
According to an embodiment of the present invention, the nitric oxide oxidation device 1, the nitrogen dioxide reduction device 2, the acid exhaust gas treatment device 3 are vertical.
According to the utility model discloses an embodiment, nitric oxide oxidation unit 1 nitrogen dioxide reduction unit 2 acid exhaust treatment device 3 is horizontal.
The utility model discloses following beneficial effect has: the nitric oxide oxidation device in the system can firstly oxidize NO into NO2Therefore, the nitrogen oxide treatment efficiency of the system can always ensure 90 percent regardless of the content proportion of NO in the waste gas; the processes of adding reactants (oxidant, reducing agent and sodium hydroxide), supplementing water and discharging sewage in each device are automatically controlled by an automatic controller through a valve, and the system is stable and reliable in operation and simple in operation and maintenance.
Drawings
FIG. 1 is a schematic view of a system for treating exhaust gas according to a first embodiment of the present invention;
fig. 2 is a schematic view of a nitric oxide oxidation apparatus according to a first embodiment of the present invention;
fig. 3 is a schematic view of a nitrogen dioxide reduction and acid exhaust gas treatment apparatus according to a first embodiment of the present invention;
FIG. 4 is a schematic view of a system for treating exhaust gases according to a second embodiment of the present invention;
FIG. 5 is a schematic view of a system for treating exhaust gas according to a third embodiment of the present invention;
fig. 6 is a schematic view of a nitric oxide oxidation apparatus according to a third embodiment of the present invention;
figure 7 is a schematic view of a nitrogen dioxide reduction apparatus according to a third embodiment of the present invention;
fig. 8 is a schematic view of an acidic exhaust gas treatment device according to a third embodiment of the present invention;
fig. 9 is a schematic view of a system for treating exhaust gas according to a fourth embodiment of the present invention.
Wherein, 11-nitrogen monoxide oxidation device: 1011-outer shell, 1201-spray port, 1211-circulating liquid storage, 1041-circulating liquid pump, 1051-liquid level meter, 1061-oxidation-reduction potentiometer, 1071-conductivity meter, 1311-oxidant supply pipe, 1321-water replenishing pipe, 1331-blow-off pipe, 1081-first valve, 1091-second valve, 1101-third valve, 1111-automatic controller, 1411-gas inlet, 1421-gas outlet, 1431-circulating liquid collecting port, 1021-packing layer and 1031-demisting layer;
21-nitrogen dioxide reduction and acid waste gas treatment device: 2011-a shell, 2201-a spray port, 2211-a circulating liquid storage, 2041-a circulating liquid pump, 2051-a liquid level meter, 2061-an oxidation reduction potential instrument, 2071-a conductivity meter, 2121-a pH value tester, 2311-a reducing agent liquid supply pipe, 2321-a water replenishing pipe, 2331-a blow-down pipe, 2341-a sodium hydroxide liquid supply pipe, 2081-a first valve, 2091-a second valve, 2101-a third valve, 2131-a fourth valve, 2111-an automatic controller, 2411-a gas inlet, 2421-a gas outlet, 2431-a circulating liquid collecting port, 2021-a packing layer and 2031-a defogging layer;
31-an exhaust device, 41-an air inlet pipeline and 51-an exhaust pipeline;
1-nitric oxide oxidation device: 101-shell, 120-spray opening, 121-circulating liquid storage, 104-circulating liquid pump, 105-liquid level meter, 106-oxidation reduction potential meter, 107-conductivity meter, 131-oxidant liquid supply pipe, 132-water replenishing pipe, 133-sewage discharging pipe, 108-first valve, 109-second valve, 110-third valve, 111-automatic controller, 141-gas inlet, 142-gas outlet, 143-circulating liquid collecting opening, 102-packing layer and 103-demisting layer;
2-nitrogen dioxide reduction device: 201-shell, 220-spray port, 221-circulating liquid storage, 204-circulating liquid pump, 205-liquid level meter, 206-oxidation reduction potential meter, 207-conductivity meter, 231-reducing agent supply pipe, 232-water replenishing pipe, 233-blow-off pipe, 208-first valve, 209-second valve, 210-third valve, 211-automatic controller, 241-gas inlet, 242-gas outlet, 243-circulating liquid collecting port, 202-packing layer, 203-demisting layer;
3-acid exhaust gas treatment device: 301-shell, 320-spray port, 321-recycle liquid storage, 304-recycle liquid pump, 305-liquid level meter, 306-pH value tester, 307-conductivity meter, 331-sodium hydroxide liquid supply pipe, 332-water replenishing pipe, 333-sewage drain pipe, 308-first valve, 309-second valve, 310-third valve, 311-automatic controller, 341-gas inlet, 342-gas outlet, 343-recycle liquid collecting port, 302-packing layer, 303-demisting layer;
4-an exhaust device, 5-an air inlet pipeline and 6-an exhaust pipeline.
Detailed Description
The following detailed description is to be construed as illustrative, and not restrictive, of the present invention, and the invention is further described and illustrated in connection with the following detailed description.
The utility model discloses in, acid waste gas especially indicates that the principal ingredients that produces in the nitrogen dioxide reduction treatment process is the acid gas of hydrogen sulfide to and get into the acid waste gas that just contains originally in the waste gas before the nitric oxide oxidation unit.
The nitrogen oxide exhaust gas comprising N2O、NO、NO2And the like.
The valve of the utility model can be selected from an electric two-way valve, a three-way valve and the like.
The utility model provides a system for handle waste gas.
As shown in fig. 1, a system according to a first embodiment of the present invention includes: the nitrogen monoxide oxidation device 11 and the nitrogen dioxide reduction and acid exhaust gas treatment device 21 are arranged from the upstream to the downstream in sequence. The system also comprises an air inlet pipeline 41, an air exhaust device 31 and an air exhaust pipeline 51; the exhaust device 31 is arranged at the downstream of the nitrogen dioxide reduction and acid exhaust gas treatment device 21, and the exhaust pipeline 51 is arranged at the downstream of the exhaust device 31; the intake duct 41 is provided upstream of the nitrogen monoxide oxidation device 11 and is connected to the nitrogen monoxide oxidation device 11.
Nitric oxide oxidation device
As shown in fig. 2, the nitric oxide oxidation device 11 includes a housing 1011, a spray port 1201, a circulating liquid storage 1211, a circulating liquid pump 1041, a liquid level meter 1051, an oxidation-reduction potential meter 1061, a conductivity meter 1071, an oxidant supply pipe 1311, a water replenishing pipe 1321, a drain pipe 1331, a first valve 1081 for controlling the replenishment of an oxidant solution, a second valve 1091 for controlling the replenishment of water, a third valve 1101 for controlling the discharge of sewage, an automatic controller 1111, a gas inlet 1411 for the intake of nitrogen oxide off-gas, a gas outlet 1421 for discharging treated off-gas, and a circulating liquid collection port 1431;
the spraying port 1201 is arranged in the outer shell 1011, the gas inlet 1411 is arranged on the upstream of the outer shell 1011, and the gas outlet 1421 is arranged on the downstream of the outer shell 1011; a circulating liquid collecting port 1431 is arranged between the outer shell 1011 and the circulating liquid storage 1211, and the circulating liquid pump 1041 pumps the circulating liquid in the circulating liquid storage 1211 into the outer shell 1011 from the spraying port 1201;
the circulating liquid storage 1211 is connected to the liquid level meter 1051, the oxidation-reduction potentiometer 1061 and the conductivity meter 1071, respectively, the automatic controller 1111 is electrically connected to the liquid level meter 1051, the automatic controller 1111 is electrically connected to the second valve 1091, the automatic controller 1111 is electrically connected to the oxidation-reduction potentiometer 1061, the automatic controller 1111 is electrically connected to the first valve 1081, the automatic controller 1111 is electrically connected to the conductivity meter 1071, and the automatic controller 1111 is electrically connected to the third valve 1101; the first valve 1081 is disposed on the oxidizer supply pipe 1311, the second valve 1091 is disposed on the supplementary water pipe 1321, and the third valve 1101 is disposed on the drain pipe 1331.
The nitric oxide oxidation device 11 may further comprise a filler layer 1021 fixed inside the outer shell 1011 and a demister layer 1031, the filler layer 1021 being located upstream of the demister layer 1031.
After the nitrogen oxide waste gas enters the nitrogen oxide oxidation device 11 through the air inlet pipeline 41, NO in the nitrogen oxide waste gas contacts with an oxidant in the circulating liquid to react, so that NO is oxidized into NO2And then enters a next-stage nitrogen dioxide reduction and acid waste gas treatment device. The oxidant is NaClO or NaClO2、KMnO4One or more than one of them.
The main component of the filler layer 1021 is hollow resin spheres (such as PP (polypropylene) or PPC (polymethyl ethylene carbonate)), which can increase the chance of contact of NO with the oxidant. The defogging layer 1031 is mainly composed of hollow resin beads (for example, PP (polypropylene) or PPC (polymethyl ethylene carbonate)), and can prevent the circulating fluid from entering the next stage treatment device along with the exhaust gas to affect the treatment effect of the next stage treatment device, and can prevent the increase of the consumption of the oxidant caused by the circulating fluid, and the defogging layer 103 can also be made of corrugated plates with grooves.
The automatic controller 1111 automatically controls the first valve 1081 of the oxidizer supply pipe 1311 based on a detection value of the oxidation-reduction potentiometer 1061, opens the first valve 1081 when the oxidation-reduction potential is lower than a lower limit of a set value, and supplies the oxidizer to the circulation liquid through the oxidizer supply pipe 1311, and stops supplying the oxidizer when the oxidation-reduction potential is higher than an upper limit of the set value.
The automatic controller 1111 automatically controls the second valve 1091 of the water replenishment pipe 1321 based on the detection value of the level gauge 1051, opens the second valve 1091 when the water level is lower than the lower limit value, and replenishes water from the water replenishment pipe 1321 into the circulating liquid, and stops replenishing water when the water level is higher than the upper limit value.
The automatic controller 1111 automatically controls the third valve 1101 on the sewage pipe 1331 according to the detection value of the conductivity meter 1071, and opens the third valve 1101 on the sewage pipe 1331 for sewage disposal when the conductivity value is higher than the set value.
In order to enhance the effect of the oxidation reaction, an acidic solution may be added to the circulating liquid of the nitric oxide oxidation apparatus through the oxidizer supply pipe 1311.
Nitrogen dioxide reduction and acid waste gas treatment device
As shown in fig. 3, the nitrogen dioxide reduction and acidic exhaust gas treatment device 21 includes a housing 2011, a spray port 2201, a circulating liquid storage 2211, a circulating liquid pump 2041, a level gauge 2051, an oxidation-reduction potential meter 2061, a conductivity meter 2071, a pH tester 2121, a reducing agent supply pipe 2311, a water replenishing pipe 2321, a sewage draining pipe 2331, a sodium hydroxide supply pipe 2341, a first valve 2081 for controlling replenishing of a reducing agent solution, a second valve 2091 for controlling replenishing of water, a third valve 2101 for controlling discharge of sewage, a fourth valve 21011 for controlling replenishment of a sodium hydroxide solution, an automatic controller 2111, a gas inlet 2411 for entry of exhaust gas treated by an oxynitride 21311 device, a gas outlet 2421 for discharge of the treated exhaust gas, and a circulating liquid collection port 2431;
the spraying port 2201 is arranged in the shell 2011, the gas inlet 2411 is arranged at the upstream of the shell 2011, and the gas outlet 2421 is arranged at the downstream of the shell 2011; a circulating liquid collecting port 2431 is arranged between the housing 2011 and the circulating liquid storage 2211, and the circulating liquid pump 2041 pumps the circulating liquid in the circulating liquid storage 2211 into the housing 2011 from the spraying port 2201;
the circulating liquid storage 2211 is respectively connected with the four liquid level meter 2051, the oxidation-reduction potentiometer 2061, the conductivity meter 2071 and the pH value tester 2121, the automatic controller 2111 is electrically connected with the liquid level meter 2051, the automatic controller 2111 is electrically connected with the second valve 2091, the automatic controller 2111 is electrically connected with the oxidation-reduction potentiometer 2061, the automatic controller 2111 is electrically connected with the first valve 2081, the automatic controller 2111 is electrically connected with the conductivity meter 2071, the automatic controller 2111 is electrically connected with the third valve 2101, the automatic controller 2111 is electrically connected with the pH value tester 2121, and the automatic controller 2111 is electrically connected with the fourth valve 2131; the first valve 2081 is disposed on the reducing agent supply pipe 2311, the second valve 2091 is disposed on the water supplement pipe 2321, the third valve 2101 is disposed on the sewage discharge pipe 2331, and the fourth valve 2131 is disposed on the sodium hydroxide supply pipe 2341.
The nitrogen dioxide reduction and acidic exhaust gas treatment device 21 further includes a filler layer 2021 and a defogging layer 2031 fixed inside the housing 2011, wherein the filler layer 2021 is located upstream of the defogging layer 2031.
After the waste gas treated by the nitric oxide oxidation device 11 enters a nitrogen dioxide reduction and acid waste gas treatment device, NO in the waste gas2And circulation ofThe reducing agent in the liquid contacts and reacts to make NO2Reduction to N2And, other acidic exhaust gases and NO2By-product H formed in the reduction reaction2S is contacted with sodium hydroxide in the circulating liquid to generate neutralization reaction, salt and water are generated, at the moment, harmful substances in the waste gas are basically removed, and the waste gas is pressurized by the exhaust device 31 and then can be exhausted into the atmosphere through the exhaust pipeline 51. The reducing agent is usually Na2S、NaHS、Na2SO3、Na2S2O3One or more than one of them.
The filler layer 2021 contains hollow resin beads (such as PP (polypropylene) or PPC (polymethyl ethylene carbonate)) as main component for increasing NO2Contact with the reducing agent. The defogging layer 2031 is mainly composed of hollow resin beads (e.g., PP (polypropylene) or PPC (polymethyl ethylene carbonate)), so that the circulation fluid is prevented from entering the exhaust device along with the exhaust gas to affect the normal operation of the exhaust device, and the consumption of the reducing agent and sodium hydroxide is prevented from increasing, and the defogging layer 2031 may be made of corrugated sheets with grooves.
The automatic controller 2111 automatically controls the first valve 2081 on the reducing agent supply pipe 2311 according to the detection value of the oxidation-reduction potentiometer 2061, opens the first valve 2081 when the oxidation-reduction potential is higher than the upper limit of the set value, and supplements the reducing agent from the reducing agent supply pipe 2311 to the circulating liquid, and stops supplementing the reducing agent when the oxidation-reduction potential is lower than the lower limit of the set value.
The automatic controller 2111 automatically controls the second valve 2091 on the water supply pipe 2321 according to the detection value of the liquid level meter 2051, opens the second valve 2091 to supply water from the water supply pipe 2321 to the circulating liquid when the water level is lower than the lower limit value, and stops supplying water when the water level is higher than the upper limit value.
The automatic controller 2111 automatically controls the third valve 2101 on the sewage pipe 2331 according to the detection value of the conductivity meter 2071, and when the conductivity value is higher than the set value, the third valve 2101 on the sewage pipe 2331 is opened for sewage disposal.
The automatic controller 2111 automatically controls the fourth valve 2131 of the sodium hydroxide supply tube 2341 according to the detection value of the pH tester 2121, opens the fourth valve 2131 when the pH value is lower than the lower limit of the set value, and stops the sodium hydroxide supply from the sodium hydroxide supply tube 2341 to the circulating liquid when the pH value is higher than the upper limit of the set value.
As shown in fig. 1, the nitrogen monoxide oxidation device 11 and the nitrogen dioxide reduction and acidic exhaust gas treatment device 21 are horizontal.
According to the second embodiment of the present invention, as shown in fig. 4, the nitrogen monoxide oxidation device 11 and the nitrogen dioxide reduction and acid exhaust gas treatment device 21 are vertical.
Of course, the nitrogen monoxide oxidation device 11 is horizontal, while the nitrogen dioxide reduction and acid exhaust gas treatment device 21 is vertical; or the nitrogen monoxide oxidation device 11 is vertical, and the nitrogen dioxide reduction and acid exhaust gas treatment device 21 is horizontal.
According to another aspect of the present invention, there is provided a system in which the nitrogen dioxide reduction and acid exhaust gas treatment device 21 includes: a nitrogen dioxide reduction device 2 and an acid exhaust gas treatment device 3 which are arranged in sequence from upstream to downstream.
According to an embodiment of the present invention, the system further comprises a nitric oxide oxidation device 1 arranged upstream of the nitrogen dioxide reduction device 2.
As shown in fig. 5, a system according to a third embodiment of the present invention includes: an oxynitride oxidation device 1, a nitrogen dioxide reduction device 2, and an acidic exhaust gas treatment device 3 are provided in this order from upstream to downstream. The system also comprises an air inlet pipeline 5, an air exhaust device 4 and an air exhaust pipeline 6; the exhaust device 4 is arranged at the downstream of the acidic waste gas treatment device 3, and the exhaust pipeline 6 is arranged at the downstream of the exhaust device 4; the air inlet pipe 5 is arranged at the upstream of the nitric oxide oxidation device 1 and is connected with the nitric oxide oxidation device 1.
Nitric oxide oxidation device
As shown in fig. 6, the nitric oxide oxidation apparatus 1 includes a housing 101, a spray port 120, a recycle liquid storage tank 121, a recycle liquid pump 104, a liquid level meter 105, an oxidation-reduction potential meter 106, a conductivity meter 107, an oxidant supply pipe 131, a water replenishing pipe 132, a drain pipe 133, a first valve 108 for controlling the replenishment of an oxidant solution, a second valve 109 for controlling the replenishment of water, a third valve 110 for controlling the discharge of sewage, an automatic controller 111, a gas inlet 141 for the entry of nitrogen oxide waste gas, a gas outlet 142 for discharging the treated waste gas, and a recycle liquid collection port 143;
the spraying port 120 is arranged in the outer shell 101, the gas inlet 141 is arranged at the upstream of the outer shell 101, and the gas outlet 142 is arranged at the downstream; a circulating liquid collecting port 143 is arranged between the housing 101 and the circulating liquid storage 121, and the circulating liquid pump 104 pumps the circulating liquid in the circulating liquid storage 121 into the housing 101 through the spraying port 120;
the circulating liquid storage 121 is respectively connected with the liquid level meter 105, the oxidation-reduction potential meter 106 and the conductivity meter 107, the automatic controller 111 is electrically connected with the liquid level meter 105, the automatic controller 111 is electrically connected with the second valve 109, the automatic controller 111 is electrically connected with the oxidation-reduction potential meter 106, the automatic controller 111 is electrically connected with the first valve 108, the automatic controller 111 is electrically connected with the conductivity meter 107, and the automatic controller 111 is electrically connected with the third valve 110; the first valve 108 is disposed on the oxidant supply pipe 131, the second valve 109 is disposed on the water replenishing pipe 132, and the third valve 110 is disposed on the sewage drain pipe 133.
The nitric oxide oxidation device 1 can further comprise a filler layer 102 and a defogging layer 103 fixed inside the outer shell 101, wherein the filler layer 102 is positioned at the upstream of the defogging layer 103.
After the nitrogen oxide waste gas enters the nitrogen oxide oxidation device 1 from the air inlet pipeline 5, NO in the nitrogen oxide waste gas contacts with an oxidant in the circulating liquid to react, so that NO is oxidized into NO2And enters a next-stage nitrogen dioxide reduction device. The oxidant is NaClO or NaClO2、KMnO4One or more than one of them.
The main component of the filler layer 102 is hollow resin spheres such as PP (polypropylene) or PPC (polymethyl ethylene carbonate), which can increase the chance of contact of NO with the oxidizing agent. The main component of the demisting layer 103 is hollow resin spheres (such as PP (polypropylene) or PPC (polymethyl ethylene carbonate)), which can prevent the circulating fluid from entering the next-stage treatment device along with the exhaust gas to affect the treatment effect of the next-stage treatment device, and can prevent the increase of the consumption of the oxidant caused thereby.
The automatic controller 111 automatically controls the first valve 108 on the oxidant supply pipe 131 according to the detection value of the oxidation-reduction potentiometer 106, opens the first valve 108 when the oxidation-reduction potential is lower than the lower limit of the set value, and replenishes the oxidant from the oxidant supply pipe 131 to the circulating liquid, and stops replenishing the oxidant when the oxidation-reduction potential is higher than the upper limit of the set value.
The automatic controller 111 automatically controls the second valve 109 of the water replenishing pipe 132 based on the detection value of the liquid level meter 105, opens the second valve 109 to replenish water from the water replenishing pipe 132 into the circulating liquid when the water level is lower than the lower limit value, and stops replenishing water when the water level is higher than the upper limit value.
The automatic controller 111 automatically controls the third valve 110 on the sewage pipe 133 according to the detection value of the conductivity meter 107, and opens the third valve 110 on the sewage pipe 133 to perform sewage disposal when the conductivity value is higher than the set value.
In order to enhance the effect of the oxidation reaction, an acidic solution may be added to the circulating liquid of the nitric oxide oxidation apparatus through the oxidant supply pipe 131.
Nitrogen dioxide reduction device
As shown in fig. 7, the nitrogen dioxide reduction device 2 includes a housing 201, a spray outlet 220, a circulating liquid storage 221, a circulating liquid pump 204, a liquid level meter 205, an oxidation-reduction potentiometer 206, a conductivity meter 207, a reducing agent supply pipe 231, a water replenishing pipe 232, a drain pipe 233, a first valve 208 for controlling the replenishment of the reducing agent solution, a second valve 209 for controlling the replenishment of water, a third valve 210 for controlling the discharge of sewage, an automatic controller 211, a gas inlet 241 for the entry of the exhaust gas treated by the nitric oxide oxidation device 1, a gas outlet 242 for discharging the treated exhaust gas, and a circulating liquid collection port 243;
the spraying port 220 is arranged in the shell 201, the gas inlet 241 is arranged at the upstream of the shell 201, and the gas outlet 242 is arranged at the downstream; a circulating liquid collecting port 243 is arranged between the shell 201 and the circulating liquid storage 221, and the circulating liquid pump 204 pumps the circulating liquid in the circulating liquid storage 221 into the shell 201 through the spraying port 220;
the circulating liquid storage 221 is connected to the liquid level meter 205, the oxidation-reduction potential meter 206, and the conductivity meter 207, respectively, the automatic controller 211 is electrically connected to the liquid level meter 205, the automatic controller 211 is electrically connected to the second valve 209, the automatic controller 211 is electrically connected to the oxidation-reduction potential meter 206, the automatic controller 211 is electrically connected to the first valve 208, the automatic controller 211 is electrically connected to the conductivity meter 207, and the automatic controller 211 is electrically connected to the third valve 210; the first valve 208 is disposed on the reducing agent supply pipe 231, the second valve 209 is disposed on the water replenishing pipe 232, and the third valve 210 is disposed on the sewage drain pipe 233.
The nitrogen dioxide reduction device 2 may further include a filler layer 202 and a demister layer 203 secured within the housing 201, the filler layer 202 being located upstream of the demister layer 203.
After the waste gas treated by the nitric oxide oxidation device 1 enters a nitrogen dioxide reduction device, NO in the waste gas2Contact with reducing agent in circulating liquid to react to make NO2Reduction to N2And enters the acid exhaust gas treatment device 3 of the next stage. The reducing agent is usually Na2S、NaHS、Na2SO3、Na2S2O3One or more than one of them.
The main component of filler layer 202 is hollow resin spheres (e.g., PP (polypropylene) or PPC (polymethyl ethylene carbonate)), which can increase NO2Contact with the reducing agent. The main component of the demisting layer 203 is hollow resin balls (such as PP (polypropylene) or PPC (polymethyl ethylene carbonate)), which can prevent the circulating liquid from entering the next-stage treatment device along with the exhaust gas and influencing the treatment effect of the next-stage treatment deviceAs a result, the amount of consumption of the reducing agent can be prevented from increasing.
The automatic controller 211 automatically controls the first valve 208 on the reducing agent supply pipe 231 according to the detection value of the oxidation-reduction potentiometer 206, opens the first valve 208 when the oxidation-reduction potential is higher than the upper limit of the set value, and replenishes the reducing agent from the reducing agent supply pipe 231 to the circulating liquid, and stops replenishing the reducing agent when the oxidation-reduction potential is lower than the lower limit of the set value.
The automatic controller 211 automatically controls the second valve 209 of the water replenishing pipe 232 according to the detection value of the liquid level gauge 205, opens the second valve 209 to replenish water from the water replenishing pipe 232 to the circulating liquid when the water level is lower than the lower limit value, and stops replenishing water when the water level is higher than the upper limit value.
The automatic controller 211 automatically controls the third valve 210 on the sewage pipe 233 according to the detected value of the conductivity meter 207, and opens the third valve 210 on the sewage pipe 233 for sewage disposal when the conductivity value is higher than the set value.
In order to improve the effect of the reduction reaction and inhibit the generation of the simple substance S, an alkaline solution may be added to the circulating liquid of the nitrogen dioxide reduction device through the reducing agent liquid supply pipe 331.
Acid waste gas treatment device
As shown in fig. 8, the acidic exhaust gas treatment device 3 includes a housing 301, a spray port 320, a circulating liquid storage 321, a circulating liquid pump 304, a liquid level meter 305, a pH tester 306, a conductivity meter 307, a sodium hydroxide liquid supply pipe 331, a water replenishing pipe 332, a drain pipe 333, a first valve 308 for controlling the replenishment of a sodium hydroxide solution, a second valve 309 for controlling the replenishment of water, a third valve 310 for controlling the discharge of sewage, an automatic controller 311, a gas inlet 341 for the exhaust gas treated by the nitrogen dioxide reduction device 2 to enter, a gas outlet 342 for discharging the treated exhaust gas, and a circulating liquid collection port 343;
the spraying port 320 is arranged in the outer shell 301, the gas inlet 341 is arranged at the upstream of the outer shell 301, and the gas outlet 342 is arranged at the downstream; a circulating liquid collecting port 343 is arranged between the outer shell 301 and the circulating liquid storage 321, and the circulating liquid pump 304 pumps the circulating liquid in the circulating liquid storage 321 into the outer shell 301 through the spraying port 320;
the circulating liquid storage 321 is connected to the liquid level meter 305, the pH meter 306, and the conductivity meter 307, respectively, the automatic controller 311 is electrically connected to the liquid level meter 305, the automatic controller 311 is electrically connected to the second valve 309, the automatic controller 311 is electrically connected to the pH meter 306, the automatic controller 311 is electrically connected to the first valve 308, the automatic controller 311 is electrically connected to the conductivity meter 307, and the automatic controller 311 is electrically connected to the third valve 310; the first valve 308 is disposed on the sodium hydroxide supply pipe 331, the second valve 309 is disposed on the water replenishing pipe 332, and the third valve 310 is disposed on the sewage pipe 333.
The acidic exhaust gas treatment device 3 may further include a filler layer 302 and a defogging layer 303 fixed inside the outer shell 301, wherein the filler layer 302 is located upstream of the defogging layer 303.
After the waste gas (the main components of which are hydrogen sulfide and other acidic waste gas) treated by the nitrogen dioxide reduction device 2 enters the acidic waste gas treatment device 3, H in the waste gas2S and other acidic waste gases are contacted with sodium hydroxide in the circulating liquid to generate neutralization reaction to generate salt and water, at the moment, harmful substances in the waste gases are basically removed, and the waste gases are pressurized by an exhaust device 4 and then can be exhausted into the atmosphere through an exhaust pipeline 6.
The filler layer 302 is mainly composed of hollow resin beads (e.g., PP (polypropylene) or PPC (polymethyl ethylene carbonate)), and can increase H2S and other acidic waste gases with sodium hydroxide. The main component of the defogging layer 303 is a hollow resin ball (for example, PP (polypropylene) or PPC (polymethyl ethylene carbonate)), which can prevent the circulating liquid from entering the exhaust device along with the exhaust gas to affect the normal operation of the exhaust device, and can prevent the increase of the consumption amount of sodium hydroxide caused by the circulating liquid.
The automatic controller 311 automatically controls the first valve 308 on the sodium hydroxide supply pipe 331 according to the detection value of the pH tester 306, opens the first valve 308 when the pH value is lower than the lower limit of the set value, and makes up sodium hydroxide from the sodium hydroxide supply pipe 331 to the circulating liquid, and stops making up sodium hydroxide when the pH value is higher than the upper limit of the set value.
The automatic controller 311 automatically controls the second valve 309 of the water supply pipe 332 based on the detection value of the level gauge 305, opens the second valve 309 to supply water from the water supply pipe 332 to the circulating liquid when the water level is lower than the lower limit value, and stops supplying water when the water level is higher than the upper limit value.
The automatic controller 311 automatically controls the third valve 310 on the sewage pipe 333 according to the detection value of the conductivity meter 307, and opens the third valve 310 on the sewage pipe 333 to perform sewage disposal when the conductivity value is higher than the set value.
As shown in fig. 5, the nitrogen monoxide oxidation device 1, the nitrogen dioxide reduction device 2, and the acidic exhaust gas treatment device 3 are all horizontal.
According to the fourth embodiment of the present invention, as shown in fig. 9, the nitrogen monoxide oxidation apparatus 1, the nitrogen dioxide reduction apparatus 2, and the acidic exhaust gas treatment apparatus 3 are all vertical.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. A system for treating an exhaust gas, comprising: the nitrogen oxide oxidation device and the nitrogen dioxide reduction and acid waste gas treatment device are arranged from upstream to downstream in sequence;
the system also comprises an air inlet pipeline, an air exhaust device and an air exhaust pipeline; the exhaust device is arranged at the downstream of the nitrogen dioxide reduction and acid waste gas treatment device, and the exhaust pipeline is arranged at the downstream of the exhaust device; the air inlet pipeline is arranged at the upstream of the nitric oxide oxidation device and is connected with the nitric oxide oxidation device.
2. The system of claim 1, wherein the nitric oxide oxidation device comprises a housing, a spray port, a circulating liquid storage, a circulating liquid pump, a liquid level meter, an oxidation-reduction potentiometer, a conductivity meter, an oxidant liquid supply pipe, a water replenishing pipe, a drain pipe, a first valve for controlling the replenishment of an oxidant solution, a second valve for controlling the replenishment, a third valve for controlling the discharge of sewage, an automatic controller, a gas inlet for the entry of nitrogen oxide waste gas, a gas outlet for the discharge of treated waste gas, and a circulating liquid collecting port;
the spraying port is arranged in the shell, the gas inlet is arranged at the upstream of the shell, and the gas outlet is arranged at the downstream of the shell; a circulating liquid collecting port is arranged between the shell and the circulating liquid storage, and the circulating liquid pump pumps the circulating liquid in the circulating liquid storage into the shell through the spraying port;
the circulating liquid storage is respectively connected with the liquid level meter, the oxidation-reduction potential meter and the conductivity meter, the automatic controller is electrically connected with the liquid level meter, the automatic controller is electrically connected with the second valve, the automatic controller is electrically connected with the oxidation-reduction potential meter, the automatic controller is electrically connected with the first valve, the automatic controller is electrically connected with the conductivity meter, and the automatic controller is electrically connected with the third valve; the first valve is arranged on the oxidant liquid supply pipe, the second valve is arranged on the water replenishing pipe, and the third valve is arranged on the sewage discharge pipe.
3. The system of claim 1, wherein the nitrogen dioxide reduction and acidic exhaust gas treatment device comprises a housing, a spray port, a circulating liquid storage, a circulating liquid pump, a liquid level meter, an oxidation-reduction potentiometer, a conductivity meter, a pH value tester, a reducing agent supply pipe, a water replenishing pipe, a sewage draining pipe, a sodium hydroxide supply pipe, a first valve for controlling the replenishment of a reducing agent solution, a second valve for controlling the replenishment of water, a third valve for controlling the discharge of sewage, a fourth valve for controlling the replenishment of a sodium hydroxide solution, an automatic controller, a gas inlet for the entry of the exhaust gas treated by the nitric oxide oxidation device, a gas outlet for discharging the treated exhaust gas, and a circulating liquid collecting port;
the spraying port is arranged in the shell, the gas inlet is arranged at the upstream of the shell, and the gas outlet is arranged at the downstream of the shell; a circulating liquid collecting port is arranged between the shell and the circulating liquid storage, and the circulating liquid pump pumps the circulating liquid in the circulating liquid storage into the shell through the spraying port;
the circulating liquid storage is respectively connected with the liquid level meter, the oxidation-reduction potential meter, the conductivity meter and the pH value tester, the automatic controller is electrically connected with the liquid level meter, the automatic controller is electrically connected with the second valve, the automatic controller is electrically connected with the oxidation-reduction potential meter, the automatic controller is electrically connected with the first valve, the automatic controller is electrically connected with the conductivity meter, the automatic controller is electrically connected with the third valve, the automatic controller is electrically connected with the pH value tester, and the automatic controller is electrically connected with the fourth valve; the first valve is arranged on the reducing agent liquid supply pipe, the second valve is arranged on the water replenishing pipe, the third valve is arranged on the sewage discharge pipe, and the fourth valve is arranged on the sodium hydroxide liquid supply pipe.
4. The system of claim 1, wherein the nitrogen dioxide reduction and acid exhaust treatment device comprises: the nitrogen dioxide reduction device and the acid waste gas treatment device are arranged from upstream to downstream in sequence.
5. The system of claim 4, wherein the exhaust device is disposed downstream of the sour exhaust treatment device.
6. The system of claim 4, wherein the nitric oxide oxidation device comprises a housing, a spray port, a circulating liquid storage, a circulating liquid pump, a liquid level meter, an oxidation-reduction potentiometer, a conductivity meter, an oxidant liquid supply pipe, a water replenishing pipe, a drain pipe, a first valve for controlling the replenishment of an oxidant solution, a second valve for controlling the replenishment, a third valve for controlling the discharge of sewage, an automatic controller, a gas inlet for the entry of nitrogen oxide waste gas, a gas outlet for the discharge of treated waste gas, and a circulating liquid collecting port;
the spraying port is arranged in the shell, the gas inlet is arranged at the upstream of the shell, and the gas outlet is arranged at the downstream of the shell; a circulating liquid collecting port is arranged between the shell and the circulating liquid storage, and the circulating liquid pump pumps the circulating liquid in the circulating liquid storage into the shell through the spraying port;
the circulating liquid storage is respectively connected with the liquid level meter, the oxidation-reduction potential meter and the conductivity meter, the automatic controller is electrically connected with the liquid level meter, the automatic controller is electrically connected with the second valve, the automatic controller is electrically connected with the oxidation-reduction potential meter, the automatic controller is electrically connected with the first valve, the automatic controller is electrically connected with the conductivity meter, and the automatic controller is electrically connected with the third valve; the first valve is arranged on the oxidant liquid supply pipe, the second valve is arranged on the water replenishing pipe, and the third valve is arranged on the sewage discharge pipe.
7. The system of claim 4, wherein the nitrogen dioxide reduction device comprises a shell, a spray port, a circulating liquid storage, a circulating liquid pump, a liquid level meter, an oxidation-reduction potentiometer, a conductivity meter, a reducing agent supply pipe, a water replenishing pipe and a sewage draining pipe, a first valve for controlling the replenishment of a reducing agent solution, a second valve for controlling the water replenishment, a third valve for controlling the discharge of sewage, an automatic controller, a gas inlet for the entry of the waste gas treated by the nitric oxide oxidation device, a gas outlet for discharging the treated waste gas and a circulating liquid collecting port;
the spraying port is arranged in the shell, the gas inlet is arranged at the upstream of the shell, and the gas outlet is arranged at the downstream of the shell; a circulating liquid collecting port is arranged between the shell and the circulating liquid storage, and the circulating liquid pump pumps the circulating liquid in the circulating liquid storage into the shell through the spraying port;
the circulating liquid storage is respectively connected with the liquid level meter, the oxidation-reduction potential meter and the conductivity meter, the automatic controller is electrically connected with the liquid level meter, the automatic controller is electrically connected with the second valve, the automatic controller is electrically connected with the oxidation-reduction potential meter, the automatic controller is electrically connected with the first valve, the automatic controller is electrically connected with the conductivity meter, and the automatic controller is electrically connected with the third valve; the first valve is arranged on the reducing agent liquid supply pipe, the second valve is arranged on the water replenishing pipe, and the third valve is arranged on the sewage discharge pipe.
8. The system according to claim 4, wherein the acidic waste gas treatment device comprises a shell, a spraying port, a circulating liquid storage, a circulating liquid pump, a liquid level meter, a pH value tester, a conductivity meter, a sodium hydroxide liquid supply pipe, a water replenishing pipe and a sewage draining pipe, a first valve for controlling the replenishment of a sodium hydroxide solution, a second valve for controlling the replenishment of water, a third valve for controlling the discharge of sewage, an automatic controller, a gas inlet for the waste gas treated by the nitrogen dioxide reduction device to enter, a gas outlet for discharging the treated waste gas and a circulating liquid collecting port;
the spraying port is arranged in the shell, the gas inlet is arranged at the upstream of the shell, and the gas outlet is arranged at the downstream of the shell; a circulating liquid collecting port is arranged between the shell and the circulating liquid storage, and the circulating liquid pump pumps the circulating liquid in the circulating liquid storage into the shell through the spraying port;
the circulating liquid storage is respectively connected with the liquid level meter, the pH value tester and the conductivity meter, the automatic controller is electrically connected with the liquid level meter, the automatic controller is electrically connected with the second valve, the automatic controller is electrically connected with the pH value tester, the automatic controller is electrically connected with the first valve, the automatic controller is electrically connected with the conductivity meter, and the automatic controller is electrically connected with the third valve; the first valve is arranged on the sodium hydroxide liquid supply pipe, the second valve is arranged on the water replenishing pipe, and the third valve is arranged on the sewage discharge pipe.
CN201921317152.9U 2019-06-17 2019-08-14 System for treating waste gas Active CN212017362U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201920906840 2019-06-17
CN2019209068402 2019-06-17

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Country Link
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