KR102153836B1 - Denitrification apparatus that improves denitrification efficiency using pellet catalyst - Google Patents

Abstract

The present invention relates to a denitrification apparatus to increase denitrification efficiency when using pellet catalyst, which receives and denitrifies exhaust gas to discharge the denitrified exhaust gas. According to the present invention, the denitrification apparatus comprises a catalyst module including at least one catalyst to denitrify the inflow exhaust gas. The catalyst has closed upper and lower parts, has a partition downwardly formed from the center of the upper part, has an inlet formed on one side of a side surface of the upper part, and has an outlet formed on the other side of the side surface of the upper part, wherein the exhaust gas flows through the inlet, moves down in accordance with guidance of the partition, and moves up toward the outlet to be discharged. Accordingly, time for mixing the exhaust gas with a reactant is increased while the exhaust gas flows through the inlet, moves down in accordance with the guidance of the partition, and moves up toward the outlet to be discharged, thereby increasing denitrification efficiency when a pellet catalyst for increasing the denitrification efficiency is used.

Description

[Denitrification apparatus that improves denitrification efficiency using pellet catalyst}

The present invention relates to a denitrification apparatus that improves denitrification efficiency when using a pellet catalyst, and in particular, relates to a denitrification apparatus that increases denitrification efficiency when using a pellet catalyst that reduces nitrogen oxides to nitrogen and water and discharges nitrogen oxides when using a pellet catalyst at the rear end of a dust collector.

In general, exhaust gases from factories or automobiles contain large amounts of harmful substances that damage the natural environment. In particular, nitrogen oxides (NOX) and sulfur oxides (SOX) contained in exhaust gas directly damage the respiratory system of the human body, but are recognized as the main cause of acid rain, a type of air pollution.

Therefore, regulations on exhaust gas are being implemented internationally, and are increasingly demanded in terms of increasing energy efficiency and preventing environmental pollution.

As a result, there is a further need for a technology that effectively and economically treats pollutants generated from pollution sources such as thermal power plants, incinerators, and various industrial processes. Pollutants discharged from the pollution source are mainly classified into dust, sulfur oxides, nitrogen oxides, chlorides, and heavy metals.

A brief look at the entire process of exhaust gas treatment is as follows.

In general, the exhaust gas treatment process undergoes a process of removing dust using a dust collector for exhaust gas discharged from a boiler, and then a process of providing an appropriate reaction temperature. After the above process, a process of removing sulfur oxide and a process of removing nitrogen oxide are performed. And clean air is discharged to the outside atmosphere through the chimney. Of course, the order of the entire process for treating exhaust gas differs by industry, and the dust collector for removing dust may use both an electric dust collector or a filter dust collector, but it is irrelevant to select only one.

During the above process, a denitration facility is used to remove nitrogen oxides.

Likewise, the denitration facility is separately installed to remove nitrogen oxides in exhaust gas, and generally, methods for removing nitrogen oxides include a selective catalytic reduction method and a selective non-catalytic reduction method.

The selective catalytic reduction method is a method of decomposing nitrogen oxides in the exhaust gas into nitrogen and water vapor by injecting ammonia as a reducing agent into exhaust gas and contacting the exhaust gas injected with the reducing agent with the catalyst.

A brief look at a method of removing nitrogen oxides through the selective catalytic reduction method is as follows.

First, a catalyst of is prepared by reacting at least one of a noble metal material such as platinum, palladium, and rhodium or a transition metal such as vanadium, iron, cobalt, or copper with at least one of titanium dioxide, vanadium oxide, alumina, or zeolite.

In addition, the catalyst is bonded to a substrate such as a highly durable honeycomb-type cordierite, and loaded in several stages in a reaction tower. After that, ammonia or ammonia water, which is a reducing agent, is sprayed onto the catalyst heated to a high temperature to reduce nitrogen oxides, thereby converting it into water vapor and nitrogen gas.

At this time, the reaction mechanism is as follows.

4 NO + O2 + 4NH3 -> 4N2 + 6H20

When the exhaust gas flows into the catalyst having the structure as shown in FIG. 1, it reacts as shown in FIG. 2 in the catalyst, and a reduction reaction occurs with nitrogen gas and water as shown in the above reaction equation to remove nitrogen oxides.

The selective catalytic reduction method is referred to as a selective catalytic reduction method in the sense of preferentially reducing nitrogen oxides in exhaust gas.

On the other hand, nitrogen oxide (Nox), the main culprit of fine dust and air pollution, is becoming a social issue, and the government announced that it will greatly strengthen the emission standards of nitrogen oxides from 2020. For reference, before the government announcement, the regulation on the concentration of nitrogen oxides was loose.

Accordingly, domestic business sites are reviewing various technologies in order to comply with the reinforced emission standards, and there are the following problems.

Although it tried to apply the "SCR using the HONEY-COMB type catalyst", which is most widely applied so far, there is a problem that unnecessary additional energy costs are burdensome and the installation space is insufficient because temperature rise is required due to the characteristics of the facility.

As described above, in the conventional combustion process, nitrogen in the combustion air and nitrogen contained in solid fuel are oxidized to generate nitrogen oxides (mainly composed of nitrogen monoxide (NO) and nitrogen dioxide (NO2)). The first reduction in SNCR Nitrogen oxide is reduced and discharged below the emission standard by the catalyst of the denitrification facility (SCR). Here, the reducing agent is ammonia water (NH3) and urea water (CO(NH2)2).

However, conventionally, when the temperature is too high, the oxidation reaction has a problem of regenerating nitrogen oxides (NOx).

In addition, if the temperature is too low or the residence time is insufficient in the reaction between ammonia and nitrogen oxides, the nitrogen oxide reduction efficiency may decrease and untreated ammonia emissions may increase (ammonia slip, chemical excess).

As such, the main factors affecting the denitrification performance include proper mixing of exhaust gas, reactant, and exhaust gas, temperature, residence time, and the like.

In order to compensate for the above shortcomings, recently foreign-made PELLET TYPE catalyst is applied, and the characteristic of this TYPE is that it exhibits denitrification efficiency even at low temperature (150°C), so there is no burden of additional energy cost. In addition, the installation space required is more compact than the HONEY COMB TYPE.

The object of the present invention is to solve such a problem, and the present invention uses a pellet catalyst to increase the denitration efficiency by increasing the time for mixing the exhaust gas and the reactant by delaying the residence time after the exhaust gas enters the catalyst. It is to provide a denitration device that increases the denitration efficiency of the city.

In addition, the problem to be achieved by the present invention is to solve such a problem.After the exhaust gas flows into the inlet of the catalyst, it descends downward according to the induction of the partition wall, then rises again and reacts with the exhaust gas while exiting the outlet. It is to provide a denitration device that increases the denitration efficiency when using a pellet catalyst that increases the denitration efficiency by increasing the time during which the agent is mixed.

In addition, the problem to be achieved by the present invention is to solve such a problem, and by installing a pre-filter in the inlet of the exhaust gas, it is possible to prevent dust from passing through the filter type dust collector (B/F) and contaminating the catalyst layer. It is to provide a denitration device that improves denitrification efficiency when using a pellet catalyst that prevents combustion.

In addition, the problem to be achieved by the present invention is to solve such a problem.When the pressure difference between the front and rear ends of the catalyst is sensed, it is determined that the function of the catalyst is not smooth when the pressure is higher than the reference differential pressure, and then compressed gas is injected to the catalyst to be exhausted. It is to provide a denitration device that improves the denitration efficiency when using a pellet catalyst that allows for

A denitration apparatus for increasing denitrification efficiency when using a pellet catalyst according to the features of the present invention to achieve the above object,

This is a denitrification device that improves denitrification efficiency when using a pellet catalyst that introduces exhaust gas to perform denitrification and output.

And a catalyst module including at least one catalyst for performing a denitrification reaction after the exhaust gas is introduced,

The catalyst,

The top and bottom are blocked,

A partition wall is formed downward from the upper center,

An inlet portion is formed on one side of the upper side, and an outlet portion is formed on the other side of the upper side,

After the exhaust gas flows into the inlet, it goes down in accordance with the induction of the partition wall, and then rises up and out of the outlet.

A pre-filter is installed at the inlet through which the exhaust gas flows,

The pre-filter is characterized in that it prevents dust from entering.

A differential pressure gauge for measuring the differential pressure between the front and rear ends of the catalyst module;

A control unit for controlling to inject compressed gas from the catalyst when the differential pressure measured by the differential pressure gauge is greater than or equal to a reference value;

A compressed gas valve for supplying or blocking compressed gas from the compressed gas tank;

A compressed gas line for supplying the compressed gas when the compressed gas valve is opened;

An injector for injecting the compressed gas;

It further includes a driving unit for opening and closing the compressed gas valve to inject compressed gas under the control of the controller.

According to the above-described configuration, the present invention provides a denitration device that increases the denitration efficiency when using a pellet catalyst that increases the denitration efficiency by delaying the residence time after the exhaust gas flows into the catalyst to increase the mixing time of the exhaust gas and the reactant. I can.

In addition, the present invention is a pellet catalyst that increases the denitration efficiency by increasing the time for mixing the exhaust gas and the reactant as the exhaust gas flows into the inlet of the catalyst and then goes down and rises again according to the induction of the barrier rib. When used, it is possible to provide a denitration device that increases the denitration efficiency.

In addition, the present invention, by installing a pre-filter in the inlet of the exhaust gas, to increase the denitration efficiency when using a pellet catalyst that prevents dust from passing over and contaminating the catalyst layer in the previous filter type dust collector (B/F). A denitration apparatus can be provided.

In addition, the present invention detects the differential pressure between the front and rear ends of the catalyst and determines that the function of the catalyst is not smooth when the pressure is higher than the reference differential pressure, and thus, when using a pellet catalyst that injects compressed gas to the catalyst to dedust, the denitration efficiency is increased. Device can be provided.

1 is a view showing the configuration of a low-temperature catalyst according to the prior art.
2 is a diagram showing the principle of a general denitrification action.
3 is a view showing the configuration of a denitrification apparatus for increasing denitrification efficiency when using a pellet catalyst according to an embodiment of the present invention.
4 is a view showing a pre-filter applied to a denitrification apparatus for increasing denitrification efficiency when using a pellet catalyst according to an embodiment of the present invention.
5 is a view showing an example of a wire mesh constituting a pre-filter that is applied to a denitrification apparatus that increases denitrification efficiency when using a pellet catalyst according to an embodiment of the present invention.
6 is a view showing a front view of a hybrid injector applied to a denitrification apparatus for increasing denitrification efficiency when using a pellet catalyst according to an embodiment of the present invention.
7 is a side view of a hybrid injector.
8 is a diagram showing a plan view of a hybrid injector.
9 is a view showing the front of the hybrid injector separated.
10 is a view showing the inside of the upper cover by separating the hybrid injector.
11 is a view showing the U-bolt of the hybrid injector.
12 is a view showing a compressed gas line of a hybrid injector.
13 is a view showing the flow of compressed gas and intake air in the hybrid injector.
14 is a diagram schematically showing a state in which a tornado is formed in an upper cover of a hybrid injector according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the embodiments. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

3 is a view showing the configuration of a denitrification apparatus for increasing denitrification efficiency when using a pellet catalyst according to an embodiment of the present invention.

4 is a view showing a pre-filter applied to a denitrification apparatus for increasing denitrification efficiency when using a pellet catalyst according to an embodiment of the present invention.

5 is a view showing an example of a wire mesh constituting a pre-filter that is applied to a denitrification apparatus that increases denitrification efficiency when using a pellet catalyst according to an embodiment of the present invention.

Referring to FIG. 3, a denitration apparatus for increasing denitrification efficiency when using a pellet catalyst according to an embodiment of the present invention,

This is a denitrification device that improves denitrification efficiency when using a pellet catalyst that introduces exhaust gas to perform denitrification and output.

It includes a catalyst module 455 including at least one catalyst for performing a denitrification reaction after the exhaust gas is introduced,

The catalyst 450,

The top and bottom are blocked,

A third partition wall 453 is formed downward from the upper center,

An inlet portion 456 is formed on one side of the upper side, and an outlet portion 457 is formed on the other side.

In addition, a second partition wall 451 is formed on one side of the lower side, and a first partition wall 452 is formed on the other side.

As shown in the direction of the arrow in FIG. 3, the exhaust gas flows into the inlet 456, descends downward according to the guidance of the third partition, and then rises to the outlet 457 and flows out.

The lengths of the first and second barrier ribs 452 and 451 are 1/2 to 3/1 of the catalyst length, and the length of the third barrier rib 453 is 1/2 to 2/3 of the catalyst length.

The catalyst 450 contains a catalyst material in the form of a pellet or powder.

Noble metal substances are platinum, palladium, and rhodium. Transition metals are vanadium, iron, cobalt, copper, and the like. The catalyst material is prepared by reacting at least one of platinum, palladium, rhodium, vanadium, iron, cobalt, and copper with at least one of titanium dioxide, vanadium oxide, alumina, and zeolite.

Referring to FIG. 4 or 5, a denitration apparatus for increasing denitrification efficiency when using a pellet catalyst according to an embodiment of the present invention,

A pre-filter 460 may be installed at an inlet through which the exhaust gas flows, and the pre-filter 460 prevents the inflow of dust.

In particular, when dust is introduced without passing through the bag filter of the dust collector due to an abnormality such as a dust collector, the pre-filter 460 filters the dust to prevent contamination of the catalyst.

And, the denitration apparatus for increasing the denitration efficiency when using the pellet catalyst according to the embodiment of the present invention,

A differential pressure gauge 440 for measuring the differential pressure between the front and rear ends of the catalyst module 455;

A control unit 430 for controlling to inject compressed gas from the catalyst when the differential pressure measured by the differential pressure gauge 440 is greater than or equal to a reference value;

A compressed gas valve 410 for supplying or blocking compressed gas from the compressed gas tank;

A compressed gas line 100 for supplying the compressed gas when the compressed gas valve 410 is opened;

An injector 200 for injecting the compressed gas;

It further includes a driving unit 420 for opening and closing the compressed gas valve 410 to inject compressed gas under the control of the controller 430.

The operation of the embodiment of the present invention having such a configuration is as follows.

First, exhaust gas output from a dust collector or combustion device is introduced into the prefilter 460. At this time, ammonia or aqueous ammonia as a reducing agent is injected into the exhaust gas in advance.

In addition, the pre-filter 460 removes and outputs dust included in the exhaust gas. In particular, the introduced exhaust gas (Dust + Nox) is output after the dust is removed by the pre-filter 460 (Pre dust fitler).

Here, the pre-filter 460 prevents contamination of the catalyst 450 layer by performing pre-filtering before the dust or contaminated exhaust gas reaches the catalyst 450 layer in the previous filter type dust collector (B/F). It can extend the life of the catalyst. The pre-filter 460 may be a wire mesh or a filter made of another material in a detachable form.

Exhaust gas passing through the pre-filter 460 flows into the plurality of catalysts 45 of the catalyst module 455. At this time, the catalyst 450 is blocked by the upper and lower portions of the catalyst, and the exhaust gas flows through the upper left inlet 456, and then is blocked by the third partition wall 453, descends, and passes through the lower portion of the third partition wall. It exits to the outlet 457.

Here, the second partition wall 451 at the lower left and the first partition 452 at the lower right help the exhaust gas to move to the upper right after flowing in through the upper left and maximize the residence time of the nitrogen oxide in the catalyst. .

In addition, after the exhaust gas flows in from another neighboring catalyst, the exhaust gas exits the outlet 457 in the same path.

Here, since the exhaust gas stays in the catalyst 450 and moves longer than in the related art, the efficiency of the denitration reaction increases.

In the catalyst module 455, the number and shape of catalysts can be modified, but the residence time and movement distance in the catalyst are lengthened.

Then, the exhaust gas is combined with the reducing agent while moving in the catalyst, so that the denitrification action occurs smoothly.

Then, the exhaust gas that has passed through the catalyst module 455 is discharged through the outlet 470.

Meanwhile, the differential pressure gauge 440 measures the differential pressure between the front end and the rear end of the catalyst module 455 and outputs it to the control unit 430. In this case, when the catalyst 450 is contaminated by dust or the like, since exhaust gas cannot pass through, a differential pressure greater than or equal to the reference value occurs at the front and rear ends of the catalyst 450.

In addition, when the differential pressure measured by the differential pressure gauge 440 is greater than or equal to a reference value, the controller 430 controls the driving unit 420 to inject compressed gas from the catalyst 450.

Then, the driving unit 420 opens the compressed gas valve 410 to inject compressed gas under the control of the control unit 430, and the compressed gas valve 410 supplies compressed gas from the compressed gas tank (not shown). do.

When the compressed gas valve 410 is opened, the compressed gas is delivered to the injector through a compressed gas line and then injected toward the catalyst. Therefore, the dust attached to the catalyst falls off.

According to the above-described configuration, the present invention provides a denitration device that increases the denitration efficiency when using a pellet catalyst that increases the denitration efficiency by delaying the residence time after the exhaust gas flows into the catalyst to increase the mixing time of the exhaust gas and the reactant. I can.

In addition, the present invention is a denitrification device that increases the denitration efficiency when using a pellet catalyst that increases the denitration efficiency by increasing the time for mixing the exhaust gas and the reactant as the exhaust gas flows into the inlet of the catalyst and then goes down and goes up toward the outlet. Can provide.

In addition, the present invention, by installing a pre-filter in the inlet of the exhaust gas, to increase the denitration efficiency when using a pellet catalyst that prevents dust from passing over and contaminating the catalyst layer in the previous filter type dust collector (B/F). A denitration apparatus can be provided.

In addition, the present invention detects the differential pressure between the front and rear ends of the catalyst and determines that the function of the catalyst is not smooth when the pressure is higher than the reference differential pressure, and thus, when using a pellet catalyst that injects compressed gas to the catalyst to dedust, the denitration efficiency is increased. Device can be provided.

Hereinafter, a process in which the injector of the above process injects compressed gas will be described in more detail.

6 is a view showing a front view of a hybrid injector applied to a denitrification apparatus for increasing denitrification efficiency when using a pellet catalyst according to an embodiment of the present invention.

7 is a side view of a hybrid injector.

8 is a diagram showing a plan view of a hybrid injector.

9 is a view showing the front of the hybrid injector separated.

10 is a view showing the inside of the upper cover by separating the hybrid injector.

11 is a view showing the U-bolt of the hybrid injector.

12 is a view showing a compressed gas line of a hybrid injector.

13 is a view showing the flow of compressed gas and intake air in the hybrid injector.

14 is a diagram schematically showing a state in which a tornado is formed in an upper cover of a hybrid injector according to an embodiment of the present invention.

6 to 12, the hybrid injector applied to the embodiment of the present invention,

As a hybrid injector coupled to the compressed gas line 100 for injecting compressed gas and for injecting a mixed gas of compressed gas and air as a catalyst,

An upper cover 230 in which a first inlet port 260 of the medium to be sucked is formed and a plurality of guide vanes 232 guiding the direction of the compressed gas are formed;

A main body 100 forming a preliminary chamber 240 together with the upper cover 230;

It has an internal passage connecting the preliminary chamber 240 and the compressed gas line 100, has a concave upper portion to pass through the compressed gas line 100, and a plurality of second inlets 211 for compressed gas, Includes cradles 210 and 220 on which 221 is formed.

The preliminary chamber 240 is formed in an annular shape to surround a first inlet 260 for a medium to be sucked, and the holders 210 and 220 have two second inlets 211 and 221 facing each other.

The guide vanes 232 are formed obliquely at regular intervals on the upper cover 230 of the preliminary chamber 240, and the main body 100 and the cover 230 have a circumference 231 so as to maintain a predetermined gap. ) Is formed.

A compressed gas injection hole 130 is additionally formed in the compressed gas line 100, and the center line of the injector is made equal to the center line of the compressed gas line 100 in the upper center of the main body 100. It creates a high-pressure jet airflow and creates a Coanda effect around the inner diameter of the injector.

A plurality of ribs (Rib, 251, 252, 253, 254) for fixing the compressed gas line 100 by using a U-BOLT on the side of the main body 100, and the U-bolt The compressed gas line 100 is fixed by fastening the nuts 311 and 312 to the 310. Accordingly, the U-bolts 311 and 312 do not interfere with the air inflow path of the first inlet 260, and the compressed gas line 100 is also spaced apart from the main body 100 by the holders 210 and 220 to provide the air inflow path. A large amount of air can flow in smoothly.

The preliminary chamber 240 is connected to the second inlets 211 and 221 for inhaling compressed gas to be sucked, and an outlet 270 for compressed gas is formed under the main body 100.

The first inlet 260 is located below the plurality of second inlets 211 and 221 of the preliminary chamber 240, and the compressed gas is the second inlet 211 and 221 of the preliminary chamber 240, a holder It is injected into the outlet 270 through the inner passages 210 and 220 and the preliminary chamber 240.

The operation of the hybrid injector having this configuration will be described as follows.

13 is a view showing the flow of compressed gas and intake air in a hybrid injector, and FIG. 14 is a view schematically showing a state in which a tornado is formed in the upper cover of the hybrid injector.

Referring to FIG. 13, compressed gas is supplied from the outside to the compressed gas line 100. When the injector is connected to the compressed gas line 100, the compressed gas is supplied from the compressed gas line 100 in the direction of the arrow, the second inlets 211 and 221 connected to the compressed gas injection holes 110 and 130, and the holder ( It is supplied to the spare chamber 240 through the inner passages 210 and 220. At this time, a plurality of injectors are provided to operate each, and one injector will be described for convenience.

Then, the compressed gas is converted into a tornado or tornado shape by the guide vanes 232 formed on the upper cover of the annular preliminary chamber 240 and is injected in the direction of the outlet 270.

And, if necessary, a nozzle slot (not shown) inside the preliminary chamber 240 is additionally provided to induce a Coanda effect and generate negative pressure, so that air is passed through the first inlet 260 to the outlet 270. It can be accelerated to flow.

At this time, the inhaled air is mixed with the compressed gas in the form of a tornado or a tornado and flows more quickly toward the outlet. Here, the compressed gas may be compressed air.

On the other hand, since the compressed gas is injected downward through the compressed gas injection hole 120 of the compressed gas line 100, the speed at which air is sucked becomes faster, and the air and whirlwind sucked through the first inlet 260 The mixing and flow rates of compressed gases in the form are also faster.

Therefore, in an embodiment of the present invention, the amount of suction of the surrounding air due to the compressed gas injected from the compressed gas line to the injector inlet is increased so that more suction gas can be discharged through the outlet of the injector, and the injection pressure can be increased. .

In addition, by increasing the speed of the compressed gas passing through the outlet of the injector, more ambient air can be introduced into the catalyst together with the compressed gas passing through the outlet of the injector, thereby improving the dedusting effect of the catalyst.

In addition, in order to minimize interference between the inflow path of compressed air causing the Coanda effect and the inflow of external air, the inlet is not arranged on the same plane but on the top (about 2cm or more) to secure the inflow space and prevent the catalyst. The exhaustion effect can be maximized.

In addition, by installing a plurality of guide vanes under the upper cover of the injector, while maintaining a certain gap between the injector body and the cover, while forming a tornado (tornado) of the flow of the compressed gas flowing, it is possible to efficiently dedust the catalyst.

In addition, by making the center line of the Coanda injector equal to the center line of the compressed air pipe, a compressed air injection hole is formed in the center of the Coanda injector, forming a high-pressure jet airflow in the center, and forming a Coanda effect around the inner diameter of the injector. It can increase the dust removal efficiency.

In addition, by configuring a rib for U-BOLT assembly in the injector body and fastening it with U-BOLT & NUT, it is possible to secure ease of installation and replacement, and fastening durability.

In addition, by configuring a cradle (saddle) capable of mounting a compressed air pipe in the injector body, it is possible to secure ease of assembly by processing only a hole in the pipe.

The embodiment of the present invention described above is not implemented only through an apparatus and/or method, but a program for realizing a function corresponding to the configuration of the embodiment of the present invention, a recording medium in which the program is recorded, etc. Also, this implementation can be easily implemented by an expert in the technical field to which the present invention belongs from the description of the above-described embodiment.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (3)

This is a denitrification device that improves denitrification efficiency when using a pellet catalyst that introduces exhaust gas to perform denitrification and output.
And a catalyst module including at least one catalyst for performing a denitrification reaction after the exhaust gas is introduced,
A pre-filter is installed at the inlet through which the exhaust gas flows,
The pre-filter is characterized in that it prevents the inflow of dust,

The catalyst,
The top and bottom are blocked,
A first partition wall 452 is formed on one side of the lower side, and a second partition wall 451 is formed on the other side,
A third partition wall 453 is formed downward from the upper center,
An inlet portion 456 is formed on one side of the upper side, and an outlet portion 457 is formed on the other side,
After the exhaust gas flows into the inlet part 456, it descends downward according to the induction of the third partition wall 453, and then rises again toward the outlet part and flows out,

The length of the first partition wall 452 and the second partition wall 451 is 1/2 to 3/1 of the catalyst length, and the length of the third partition wall 453 is 1/2 to 2/3 of the catalyst length,

A catalyst material in the form of pellets or powder is included in the catalyst,
The catalyst material is prepared by reacting at least one of platinum, palladium, rhodium, vanadium, iron, cobalt, and copper with at least one of titanium dioxide, vanadium oxide, alumina, and zeolite,

Exhaust gas passing through the pre-filter is introduced into the catalyst,
Exhaust gas passing through the pre-filter flows into the catalyst,
The catalyst is blocked by the third partition wall 453 and goes down after the exhaust gas flows in through the upper left inlet 456 while the upper and lower parts of the catalyst are blocked, and then passes through the lower part of the third partition to the outlet 457 ),
The second partition wall 451 at the lower left and the first partition wall 452 at the lower right help the exhaust gas to move to the upper right after flowing in through the upper left, and delay the residence time in the catalyst of nitrogen oxides. Characterized
A denitrification device that improves denitrification efficiency when using a pellet catalyst. delete The method of claim 1,
A differential pressure gauge for measuring the differential pressure between the front and rear ends of the catalyst module;
A control unit for controlling to inject compressed gas from the catalyst when the differential pressure measured by the differential pressure gauge is greater than or equal to a reference value;
A compressed gas valve for supplying or blocking compressed gas from the compressed gas tank;
A compressed gas line for supplying the compressed gas when the compressed gas valve is opened;
An injector for injecting the compressed gas;
A denitration apparatus for increasing denitrification efficiency when using a pellet catalyst further comprising a driving unit for opening and closing the compressed gas valve to inject compressed gas under the control of the controller.

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