KR102041520B1 - Integrated processing system of nitrogen oxides and sulfur oxides - Google Patents

Abstract

The present invention discloses an integrated treatment system of nitrogen oxides and sulfur oxides, which is designed such that nitrogen oxides can be primarily treated by using a nitrogen oxide treatment unit using a selective catalytic reduction method, and sulfur oxides can be secondly treated by using a sulfur oxide treatment unit to remove nitrogen oxides and sulfur oxides contained in exhaust gases discharged from business places. The integrated treatment system according to the present invention includes: the nitrogen oxide treatment unit removing the nitrogen oxides contained in the exhaust gases by primarily treating the exhaust gases containing the nitrogen oxides and sulfur oxides; the sulfur oxide treatment unit connected to a rear end of the nitrogen oxide treatment unit and treating the sulfur oxides contained in the exhaust gases by secondly treating the primarily treated exhaust gases; an exhaust gas discharge column connected to a rear end of the sulfur oxide treatment unit; and a white lead reducing treatment unit mounted between the sulfur oxide treatment unit and the exhaust gas discharge column and reducing white lead generated by a difference between the temperature of an exhaust gas discharged to the exhaust gas discharge column and the temperature of the outside.

Description

INTEGRATED PROCESSING SYSTEM OF NITROGEN OXIDES AND SULFUR OXIDES}

The present invention relates to an integrated treatment system of nitrogen oxides and sulfur oxides, and more particularly, to remove nitrogen oxides and sulfur oxides in the exhaust gas discharged from the workplace, nitrogen oxide treatment using a nitrogen oxide treatment unit using a selective catalyst reduction method. It is directed to an integrated treatment system of nitrogen oxides and sulfur oxides designed to be able to process the first and secondary treatment of the sulfur oxides using a sulfur oxide treatment unit.

In general, among the exhaust gases generated by burning fossil fuels at workplaces, it is necessary to reduce nitrogen to the maximum by using various methods, such as nitrogen oxides (NOx) and sulfur oxides (SOx), which are harmful emissions. There is a need for an optimal prevention facility technology.

At this time, the denitrification method for the removal of nitrogen oxides generated after combustion has been developed a method that can actively respond to the trend of emission regulations that continue to strengthen.

These denitrification methods are largely classified into a wet method and a dry method depending on whether the cleaning solution is used. At this time, since the secondary method of water pollution occurs after the treatment of nitrogen oxides, most of the exhaust gas denitrification methods currently used are dry methods. It is coming true.

Related prior arts are Korean Patent Laid-Open Publication No. 10-2010-0104173 (published on September 29, 2010), which describes a method and a treatment apparatus for nitrogen oxide using ozone and a catalytic hybrid system.

In order to remove nitrogen oxides and sulfur oxides in the exhaust gas discharged from the workplace, an object of the present invention is to treat nitrogen oxides first using a nitrogen oxide treatment unit using a selective catalytic reduction method, and sulfur oxides using a sulfur oxide treatment unit. It is to provide an integrated treatment system of nitrogen oxides and sulfur oxides designed to be capable of secondary treatment.

An integrated treatment system of nitrogen oxides and sulfur oxides according to an embodiment of the present invention for achieving the above object is a nitrogen for removing nitrogen oxides in the exhaust gas by primarily treating the exhaust gas containing nitrogen oxides and sulfur oxides An oxide treatment unit; A sulfur oxide treatment unit connected to a rear end of the nitrogen oxide treatment unit and configured to treat sulfur oxide in the exhaust gas secondaryly by treating the firstly treated exhaust gas; An exhaust gas discharge tower connected to a rear end of the sulfur oxide treatment unit; And a white smoke reduction processing unit mounted between the sulfur oxide processing unit and the exhaust gas discharge tower to reduce white smoke generated due to a temperature difference between the temperature of the exhaust gas discharged to the exhaust gas discharge tower and an external temperature. It is done.

In the integrated treatment system of nitrogen oxides and sulfur oxides according to the present invention, in order to remove nitrogen oxides and sulfur oxides in the exhaust gas discharged from the workplace, the nitrogen oxides are treated first using a nitrogen oxide treatment unit using a selective catalytic reduction method, Sulfur oxide may be treated secondly using the sulfur oxide treatment unit.

In addition, the integrated treatment system of nitrogen oxides and sulfur oxides according to the present invention, in order to reduce the visual aversion of the outsider due to the white smoke caused by the sharp difference between the exhaust temperature and the outside temperature of the exhaust gas, the white smoke reduction treatment unit and the sulfur oxide treatment unit and It is installed to be connected between the exhaust towers to minimize the generation of smoke.

In addition, the integrated treatment system of nitrogen oxide and sulfur oxide according to the present invention increases the reaction time between the nitrogen oxide and the reducing agent by introducing a nitrogen oxide treatment unit having an airflow retardation plate, thereby minimizing the amount of the reducing agent and improving the treatment efficiency of the nitrogen oxide. As a structural advantage to maximize the economical effect can be reduced nitrogen oxides.

1 is a cross-sectional view showing an integrated treatment system of nitrogen oxides and sulfur oxides according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing in detail the nitrogen oxide treatment of Figure 1;
3 is an enlarged cross-sectional view of a portion A of FIG. 2;
4 is an enlarged cross-sectional view illustrating a portion B of FIG. 3.
5 is a schematic diagram showing in detail the sulfur oxide treatment of FIG.
6 is a schematic diagram specifically showing a white smoke reduction treatment unit.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, a detailed description will be given of an integrated treatment system of nitrogen oxide and sulfur oxide according to a preferred embodiment of the present invention with reference to the accompanying drawings.

1 is a cross-sectional view showing an integrated treatment system of nitrogen oxides and sulfur oxides according to an embodiment of the present invention.

1, the integrated processing system 600 of nitrogen oxides and sulfur oxides according to an embodiment of the present invention is nitrogen oxide processing unit 100, sulfur oxide processing unit 200, exhaust gas discharge tower 300 and white smoke reduction It includes a processor 400.

Nitrogen oxide treatment unit 100 is mounted to remove the nitrogen oxide in the exhaust gas by primarily treating the exhaust gas containing nitrogen oxide and sulfur oxide discharged from the workplace.

At this time, the nitrogen oxide treatment unit 100 increases the reaction time between the reducing agent and the nitrogen oxide reacting with the reducing agent by introducing an airflow retardation plate (140 of FIG. 3) which increases the reaction time with the reducing agent to the maximum, thereby treating the nitrogen oxides efficiently. It will be possible to improve.

The sulfur oxide treatment unit 200 is connected to the rear end of the nitrogen oxide treatment unit 100 and is mounted to treat the sulfur oxide in the exhaust gas by treating the primary treated exhaust gas secondaryly. The sulfur oxide treatment unit 200 maximizes the sulfur oxide treatment efficiency by simply and reliably reducing the mist included in the exhaust gas primarily treated by the nitrogen oxide treatment unit 100.

The exhaust gas discharge tower 300 is connected to the rear end of the sulfur oxide treatment unit 200. At this time, the exhaust gas discharge tower 300 may have a cylindrical shape, but is not limited thereto.

The white smoke reduction processing unit 400 is installed between the sulfur oxide processing unit 200 and the exhaust gas discharge tower 300, and is generated due to a sudden temperature difference between the exhaust gas discharged to the exhaust gas discharge tower 300 and an external rapid temperature difference. It serves to reduce white smoke.

That is, the white smoke abatement processor 400 reduces the temperature of the exhaust gas secondaryly processed by the sulfur oxide treatment unit 200 in the condenser and condenses the exhaust gas discharge tower 300 in a state where the temperature of the exhaust gas is lower than the outside temperature. By exhausting the exhaust gas to the outside through the white smoke can be prevented from occurring.

In addition, the integrated treatment system 600 of nitrogen oxides and sulfur oxides according to an embodiment of the present invention further includes a preheater 500. At this time, the preheater 500 is installed between the nitrogen oxide processing unit 100 and the sulfur oxide processing unit 200 to control the temperature of the exhaust gas which is first processed by the nitrogen oxide processing unit 100.

In the integrated treatment system of nitrogen oxide and sulfur oxide according to the embodiment of the present invention described above, in order to remove nitrogen oxide and sulfur oxide in the exhaust gas discharged from the workplace, the nitrogen oxide treatment unit using the nitrogen oxide treatment unit using the selective catalytic reduction method is used. The primary treatment may be performed, and the sulfur oxide may be secondaryly treated using a sulfur oxide treatment unit.

In addition, the integrated treatment system of nitrogen oxides and sulfur oxides according to an embodiment of the present invention, in order to reduce the visual aversion of the outsider due to the white smoke caused by the sharp difference between the exhaust temperature and the outside temperature, the white smoke reduction treatment unit sulfuric acid It is installed to be connected between the cargo handling unit and the exhaust gas discharge tower to minimize the generation of white smoke.

This will be described in more detail with reference to the accompanying drawings.

FIG. 2 is a schematic view illustrating the nitrogen oxide treatment unit of FIG. 1 in detail, FIG. 3 is an enlarged cross-sectional view of portion A of FIG. 2, and FIG. 4 is an enlarged cross-sectional view of portion B of FIG. 3.

As shown in Figures 2 to 4, the nitrogen oxide treatment unit 100 of the present invention is a process is carried out by a dry method, in particular selective catalytic reduction (SCR) is used.

At this time, the treatment reaction mechanism of the selective catalytic reduction method is as follows.

First, when oxygen is present, the reaction is performed as in Equations 1 and 2 below.

Equation 1: 4NH ₃ + 4NO + O ₂ → 4N ₂ + 6H ₂ O

Equation 2: 4NH ₃ + 2NO ₂ + O ₂ → 3N ₂ + 6H ₂ O

As in Equations 1 and 2 above, ammonia (NH ₃ ) is hydrolyzed and reacts with nitrogen oxides, thereby converting nitrogen oxides into nitrogen (N ₂ ) and water (H ₂ O) to reduce the emissions of nitrogen oxides. It can be minimized. At this time, the reaction is made at a temperature of approximately 700 ~ 1,100 ℃.

On the other hand, when oxygen is not present, the reaction is performed as in Equation 3 below.

Equation 3: 4NH ₃ + 6NO → 5N ₂ + 6H ₂ O

In the above reaction process, an additional reaction may be performed as shown in Equations 4 and 5 below when the temperature is lowered.

Equation 4: 2NH ₃ + 2O ₂ → N ₂ O + 3H ₂ O

Equation 5: 2NH ₃ + 5 / 2NO ₂ → 2NO + 3H ₂ O

As a reducing agent of such a selective catalytic reduction method, an aqueous ammonia solution or urea water (anhydrous ammonia) is used.

High concentrations of ammonia are treated as dangerous substances and use low concentrations of aqueous ammonia solution, so high concentrations of nitrogen oxides require large amounts of aqueous ammonia solution. In addition, in the case of urea water, the treatment efficiency is relatively good, but there is a problem in that the cost is higher than the aqueous ammonia solution and economic considerations are required.

In view of this, the nitrogen oxide treatment unit 100 of the present invention introduces an airflow delay plate that increases the reaction time with the reducing agent to the maximum, thereby increasing the reaction time between the reducing agent and the nitrogen oxide reacting with the reducing agent to improve the treatment efficiency of the nitrogen oxide. Improved.

To this end, the nitrogen oxide treatment unit 100 includes a reaction tower 110, an airflow inlet duct 120, a reducing agent injector 130, and an airflow delay plate 140.

The reaction tower 110 serves to reduce nitrogen oxide (NOx) to N ₂ using a reducing agent. To this end, the reaction tower 110 may have an empty space therein for the nitrogen oxide and the reducing agent to react. In addition, the reaction tower 110 may be filled with a catalyst (C) for promoting the reaction of the nitrogen oxide and the reducing agent. In this case, the reaction tower 110 may be provided with an exhaust port 115 for discharging nitrogen (N ₂ ) gas generated after the reaction between the nitrogen oxide and the reducing agent.

The reaction tower 110 is connected to the compressed air supply pipe 25. The compressed air supply pipe 25 supplies the compressed air from the process air compression tank 20 to the inside of the reaction tower 110.

Air flow inlet duct 120 is in contact with the side wall and the bottom surface of the reaction tower 110 is integrally connected to the reaction tower (110). At this time, the air flow inlet duct 120 may be mounted to communicate with the exhaust gas discharge pipe 15 for supplying the exhaust gas discharged from the boiler 10 used in the workplace. Accordingly, the exhaust gas containing nitrogen oxide and sulfur oxide is introduced into the airflow inlet duct 120. That is, the exhaust gas containing nitrogen oxide and sulfur oxide generated from the boiler 10 is inside the airflow inlet duct 120 through the inlet 125 of the airflow inlet duct 120 connected to the exhaust gas discharge pipe 15. Flows into.

The airflow inlet duct 120 is installed in the vertical direction along the side wall surface of the reaction tower 110, and extends in the horizontal direction from the vertical part 122 and the vertical part 122 integrally fixed to the reaction tower 110. And a horizontal portion 120 integrally fixed to the bottom surface of the reaction tower 110.

Nitrogen oxide treatment unit 100 is designed in an integrated structure in which the air flow inlet duct 120 is mounted in a form that is directly attached to the side wall and the bottom surface of the reaction tower 110 can be compact facility (react) Since the airflow inlet duct 120 is attached and fixed to the tower 110, there is no need to design a separate support for supporting the airflow inlet duct 120.

The reducing agent injector 130 is mounted inside the upper side of the airflow inlet duct 120, and serves to supply a gaseous reducing agent to the inside of the reaction tower 110 through the airflow inlet duct 120. At this time, the reducing agent is an aqueous ammonia solution or urea water. The reducing agent injector 130 is connected to the reducing agent supply pipe 35, the supply and blocking of the reducing agent is controlled by the reducing agent supply control valve 32 mounted on the reducing agent supply pipe (35).

The airflow delay plate 140 is mounted inside the airflow inlet pipe 120, and serves to increase the reaction time with the reducing agent in the gas phase.

At this time, the air flow delay plate 140 may be mounted on the inner wall of the air flow inlet duct 120 so that at least two or more face each other. The airflow delay plate 140 may be a metal material, but is not limited thereto.

The airflow retardation plate 140 is preferably disposed such that both sides facing each other have a symmetrical structure. Here, the airflow retardation plate 140 is preferably designed to have a predetermined slope to face the horizontal portion 124 of the airflow inlet duct 120.

As such, when the airflow retardation plate 140 is mounted on the inner wall of the airflow inlet duct 120 to have at least two mutually symmetrical structures, the airflow induction duct 120 is formed by the airflow delay plate 140. By expanding the gas phase path introduced into the interior of the gas, it is possible to increase the reaction time between the nitrogen oxide and the reducing agent to the maximum.

As a result, the nitrogen oxide processing unit 100 increases the reaction time between the nitrogen oxide and the reducing agent by expanding the inflow path by the airflow delay plate 140, thereby minimizing the amount of the reducing agent and maximizing the processing efficiency of the nitrogen oxide. As an economic advantage, there is an effect that can economically reduce nitrogen oxides.

In this case, as illustrated in FIG. 4, the airflow retardation plate 140 may include a plurality of etching grooves H from which at least one surface thereof is removed. In this case, the plurality of etching grooves H may enlarge the reaction area of the airflow delay plate 140 to further increase the reaction time between the reducing agent and the nitrogen oxide reacting with the reducing agent to maximize the treatment efficiency of the nitrogen oxide.

5 is a schematic diagram specifically illustrating a sulfur oxide treatment part of FIG. 1.

As shown in FIG. 5, the sulfur oxide treatment unit 200 includes a main body 210, a porous plate 220, a packed layer 230, a mist separator 240, a cleaner 250, and a demister 260. do.

The main body 210 may have a cylindrical shape, but is not limited thereto. The sulfur oxide treatment unit 200 of the present invention is disposed on the upper side of the main body 210 and the exhaust gas primarily processed by the nitrogen oxide treatment unit 100 by the exhaust gas connection pipe 45 connected to the lower side of the main body 210. The washing water supplied through the connected washing water supply pipe 55 comes into gas-liquid contact.

To this end, the exhaust gas connection pipe 45 is connected to the nitrogen oxide processing unit 100. At this time, the exhaust gas connection pipe 45 is equipped with a preheater 500 for controlling the temperature of the exhaust gas primarily processed by the nitrogen oxide processing unit 100.

The washing water supply pipe 55 supplies the washing water from the washing water supply pump 50 to the washing machine 560 provided in the main body 210. At this time, the washing water is a liquid containing lime, to remove the sulfur oxide contained in the exhaust gas by the lime plaster method.

The perforated plate 220 is mounted at an inner lower portion of the main body 210 and installed to move the exhaust gas treated by the nitrogen oxide treatment unit 100 upward. To this end, the porous plate 220 is provided with a plurality of pores, the exhaust gas is introduced to the upper side of the body 210 through the plurality of pores.

The packed layer 230 is installed to remove sulfur oxides in the exhaust gas passing through the porous plate 220 by physical collision. The filling layer 230 may be filled with irregular fillers such as polling, lashing, and interlock saddles, or regular fillers such as packing.

The mist separator 240 serves to separate mist in the exhaust gas that has passed through the packed bed 230.

The demister 250 is installed to remove mist generated in the main body 210 by physical collision. Demister 250 is a low pressure loss, but may not be able to remove the mist of the fine particle diameter of about 30 ㎛ or less. Therefore, when the packed bed 230 and the scrubber 260 are not installed, there is a fear that mist may be included in the exhaust gas discharged to the exhaust gas discharge tower 270, so that the packed bed 230 and the scrubber 260 must be used. You must install it.

The cleaner 260 serves to clean the packed layer 230, the Mr separator 240, and the demister 250. In this case, three scrubbers 260 are mounted between the mist separator 240 and the demister 250 and between the packed bed 230 and the mist separator 240, but the number and location of the cleaners are exemplary. May be changed in various ways.

The washing by the cleaner 260 may be performed intermittently or continuously. For example, when mist can be removed only by the packed layer 230, the packed layer 230 is cleaned by intermittent operation. As a result, the amount of washing water used, the amount of water discharged from the sulfur oxide treatment unit 200, and the power of the washing water supply pump 50 can be reduced. As a method of performing the cleaning intermittently, there is a method of selectively spraying only a part of the filling layer 230 using the cleaning nozzle. At this time, the washing water used inside the main body 210 is discharged to the outside through the washing water discharge pump 280.

Accordingly, since the sulfur oxide treatment unit 200 of the present invention can easily and reliably reduce the mist included in the exhaust gas treated by the nitrogen oxide treatment unit 100, the sulfur oxide treatment efficiency can be maximized. Will be.

It is a schematic diagram which showed the white smoke reduction process part concretely.

As shown in FIG. 6, the white smoke abatement processor 400 includes a condenser 410, a condensate storage tank 420, and an outside air supply 430.

The condenser 410 serves to reduce a portion of the water vapor by condensing the exhaust gas so that the absolute amount of water vapor contained in the exhaust gas secondary processed by the sulfur oxide treatment unit 200 is reduced. That is, the condenser 410 is a device that cools the exhaust gas to take heat away from condensation and changes it. The condenser 410 cools the high-pressure and high-temperature exhaust gas secondaryly processed by the sulfur oxide treatment unit 200, removes the heat of condensation, and liquefies the exhaust gas. By discharging the condensed water in the condensed water storage tank 420 and partially removing the condensed water, the temperature of the exhaust gas is lower than that of the external temperature.

The condensate storage tank 420 is installed to store the condensate inside the condenser 410. At this time, the condensate stored in the condensate storage tank 420 is circulated by the circulation pump 440.

The outside air supply 430 is mounted to supply the outside air into the condenser 410. A blower fan may be used as the outside air supplier 430, but is not limited thereto.

As described above, the white smoke reduction processing unit 400 reduces the temperature of the exhaust gas by lowering the temperature of the exhaust gas below the outside temperature by condensing the exhaust gas secondaryly processed by the sulfur oxide treatment unit 200 in the condenser 410. By discharging the exhaust gas to the outside through the exhaust gas discharge tower 300, it is possible to prevent white smoke from occurring.

As described above, the integrated treatment system of nitrogen oxide and sulfur oxide according to an embodiment of the present invention uses a nitrogen oxide treatment unit using a selective catalytic reduction method to remove nitrogen oxide and sulfur oxide in the exhaust gas discharged from the workplace. In this way, the nitrogen oxide may be treated first, and the sulfur oxide may be treated second using a sulfur oxide treatment unit.

In addition, the integrated treatment system of nitrogen oxides and sulfur oxides according to an embodiment of the present invention, in order to reduce the visual aversion of the outsider due to the white smoke caused by the sharp difference between the exhaust temperature and the outside temperature, the white smoke reduction treatment unit sulfuric acid It is installed to be connected between the cargo handling unit and the exhaust gas discharge tower to minimize the generation of white smoke.

In addition, the integrated treatment system of nitrogen oxide and sulfur oxide according to an embodiment of the present invention increases the reaction time between the nitrogen oxide and the reducing agent by the introduction of the nitrogen oxide treatment unit having an airflow retardation plate to minimize the amount of the reducing agent while reducing the amount of nitrogen oxide. The structural advantage that can maximize the treatment efficiency of the economically has the effect of reducing the nitrogen oxides.

Although the above has been described with reference to the embodiments of the present invention, various changes and modifications can be made at the level of those skilled in the art. Such changes and modifications can be said to belong to the present invention without departing from the scope of the technical idea provided by the present invention. Therefore, the scope of the present invention will be determined by the claims described below.

100: integrated processing system
120: nitrogen oxide treatment unit
140: sulfur oxide treatment unit
160: exhaust gas discharge tower
180: white smoke reduction processing unit

Claims (6)

A nitrogen oxide treatment unit for first treating the exhaust gas containing nitrogen oxide and sulfur oxide to remove nitrogen oxide in the exhaust gas;
A sulfur oxide treatment unit connected to a rear end of the nitrogen oxide treatment unit and configured to treat sulfur oxide in the exhaust gas secondaryly by treating the firstly treated exhaust gas;
An exhaust gas discharge tower connected to a rear end of the sulfur oxide treatment unit;
A white smoke reduction processor mounted between the sulfur oxide treatment unit and an exhaust gas discharge tower to reduce white smoke generated by a temperature difference between the exhaust gas discharged to the exhaust gas discharge tower and an external temperature; And
And a preheater mounted between the nitrogen oxide processing unit and the sulfur oxide processing unit to control the temperature of the exhaust gas which is first processed by the nitrogen oxide processing unit.
The white smoke reduction processing unit may include: a condenser for reducing a portion of the water vapor by condensing the exhaust gas so that the absolute amount of water vapor contained in the exhaust gas secondaryly processed by the sulfur oxide processing unit is reduced; A condensate storage tank for storing condensate inside the condenser; And an outside air supply for supplying outside air into the condenser;
The white smoke reduction treatment unit reduces the temperature of the exhaust gas by condensing the exhaust gas secondaryly processed by the sulfur oxide treatment unit in the condenser and lowers the temperature of the exhaust gas to the outside through an exhaust gas discharge tower connected to the white smoke reduction treatment unit. To exhaust the exhaust gas,
The sulfur oxide treatment unit; A perforated plate mounted at an inner lower portion of the main body and configured to move the exhaust gas primarily processed by the nitrogen oxide treatment unit to an upper portion thereof; A packed bed for removing sulfur oxides in the exhaust gas passing through the porous plate by physical collision; A mist separator for separating mist in exhaust gas passing through the packed bed; A demister for removing mist generated in the main body by physical collision; And a scrubber for cleaning the packed bed, mr separator, and demister.
The filling layer is filled with any one of an irregular filling including polling, lashing and interlock saddles and a regular filling including packing,
When two scrubbers are mounted between the mist separator and the demister, and one is mounted between the packed bed and the mist separator, and mist can be removed only by the packed bed, the scrubber may be intermittently operated by using the cleaning nozzle of the scrubber. Integrated processing system of nitrogen oxides and sulfur oxides, characterized in that the packed bed is cleaned.
The method of claim 1,
The nitrogen oxide treatment unit
Reaction tower is filled with a catalyst;
An air flow inlet duct contacting the side wall and the bottom of the reaction tower and integrally connected to the reaction tower, into which exhaust gas containing nitrogen oxide flows;
A reducing agent injector mounted on an upper side of the airflow inlet duct and configured to supply a gaseous reducing agent to the inside of the reaction tower through the airflow inlet duct; And
An air flow retardation plate mounted inside the air flow inlet duct to increase a reaction time with the reducing agent in the gas phase;
Integrated processing system of nitrogen oxides and sulfur oxides comprising a.
The method of claim 2,
The air flow delay plate
And a plurality of etching grooves with at least a portion of one side removed therefrom.
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