KR20190106001A - Apparatus for simultaneous removing nitrogen oxide and sulfur oxides of flue gas - Google Patents

Abstract

The present invention relates to an apparatus for simultaneously removing nitrogen oxide (NO_x) and sulfur oxide (SO_x) from exhaust gas, which comprises: an absorbing tank; an absorbing tower; an exhaust gas inlet duct; an exhaust gas outlet duct; a first spray unit; a circulation pump; a second spray unit; an oxidizing agent supply unit; and an oxygen supply pipe.

Description

NOx and SOx simultaneous removal device of exhaust gas {APPARATUS FOR SIMULTANEOUS REMOVING NITROGEN OXIDE AND SULFUR OXIDES OF FLUE GAS}

The present invention relates to an apparatus for simultaneously removing nitrogen oxides and sulfur oxides of exhaust gases, and more particularly, to oxidize nitrogen monoxide (NO) contained in exhaust gases by injecting a liquid oxidant, and using nitrogen oxides and organic catalysts. The present invention relates to an apparatus for simultaneously removing nitrogen oxides and sulfur oxides of exhaust gas which can simultaneously remove sulfur oxides.

In the boiler, combustion is carried out by injecting fossil fuel, such as coal, and air containing excess oxygen, and as a result of combustion, fly ash, carbon dioxide (CO2), nitrogen oxides (NOx), and sulfur oxides ( By-products such as SOx), carbon monoxide (CO), and unburned carbon powder (HC) are generated together with heat, and unreacted nitrogen (N2) and oxygen (O2) remain.

As such, when the fuel containing sulfur is burned, sulfur is released to the atmosphere in the form of sulfur dioxide (SO2), except that it is attached to ash. This sulfur dioxide causes air pollution and causes acid rain on the earth, which has a detrimental effect on the environment as well as the human body and animals.

In addition, nitrogen oxides are mainly produced by reacting between basic oxygen and nitrogen present in the atmosphere at high temperatures at which various processes (combustion) occur, and are mainly released in the form of nitrogen monoxide (NO). These nitrogen oxides not only cause acid rain, but also form ozone and form photochemical smog.

Accordingly, in order to protect the environment, large-scale incineration plants and power plants, etc., have generally been provided with a denitrification apparatus and a desulfurization apparatus for treating nitrogen oxides and sulfur oxides in exhaust gas.

Most of the denitrification apparatuses are selective catalytic reduction apparatuses (SCRs), and the selective catalytic reduction apparatuses selectively select NOx in the exhaust gases as nitrogen and water vapor by the reaction of ammonia while simultaneously passing the exhaust gas and the ammonia (NH 3) reducing agent in the catalyst bed. Reduce.

In addition, most of the desulfurization devices are wet flue gas desulfurization devices, and in the wet desulfurization process, the exhaust gas is gas-liquid contacted with an absorbing fluid containing an alkali such as lime, thereby dissolving sulfur dioxide. It is absorbed and removed from the exhaust gas. At this time, although the gas is classified into various types according to the gas-liquid contact method of the exhaust gas and the absorbing fluid, a spray method of contact is widely used worldwide.

As a result, sulfur dioxide absorbed from the exhaust gas forms sulfite in the absorbing fluid, which is typically oxidized by blowing air into the absorbing fluid to form gypsum as a byproduct.

As such, the conventional wet flue gas desulfurization device does not have the ability to remove nitrogen oxides from the exhaust gas, and thus a separate denitrification device is provided. The method of removing nitrogen oxides of the exhaust gas, which is conventionally used, mainly uses a catalyst that forms nitrogen and water. Alternatively, using ammonia, such a method is effective only in a narrow exhaust gas temperature range, and has a relatively high cost and is prone to dust generation.

Korean Utility Model Publication No. 1998-0030926 (August 17, 1998 release)

The present invention is to solve the above problems, by injecting a liquid oxidant to oxidize nitrogen monoxide (NO) contained in the exhaust gas, by using an organic catalyst of the exhaust gas that can remove nitrogen oxides and sulfur oxides at the same time It is an object of the present invention to provide a nitrogen oxide and sulfur oxide simultaneous removal device.

The present invention for solving the above problems, the absorption tank containing the absorption liquid containing the organic catalyst, the absorption tower extending to the upper portion of the absorption tank, the exhaust gas inlet duct provided on one side of the absorption tower, An exhaust gas outlet duct provided on the other side of the absorption tower, a first injection unit installed in the absorption tower for injecting the absorption solution, and a circulation pump for supplying the absorption solution in the absorption tank to the first injection unit. A second injector installed in the inlet duct or the absorption tower for injecting an oxidant solution, an oxidant supply unit for supplying an oxidant solution to the second injector, and an oxygen supply pipe for supplying an oxygen-containing gas to the absorption tank; It provides a nitrogen oxide and sulfur oxide simultaneous removal device of the exhaust gas.

The organic catalyst may be organic sulfoxides (oil-derived sulfoxides) produced from oil.

The oxidant may be formed of at least one of H 2 O 2, NaClO 2, KMnO 4, and P 4 O 10.

The exhaust gas introduced into the inlet duct may be in primary contact with the oxidant solution injected by the second injector, and may be in secondary contact with the absorption solution injected by the first injector.

The oxidant supply unit may include a storage tank in which an oxidant solution is stored and a supply pump for supplying the oxidant solution stored in the storage tank to the second injection unit.

The second injector may be formed as a tray having a plurality of nozzles through which the oxidant solution is injected.

Ultrasonic mist makers may be installed in the plurality of nozzles, respectively.

The tray may be provided with a solution inlet for supplying an oxidant solution to the plurality of nozzles.

The tray may be formed in plural and alternately installed on one side and the other side of the absorption tower.

A flow control valve may be installed on the oxidant supply line through which the oxidant solution is supplied from the storage tank to the second injection unit.

In addition, the method may further include a concentration meter for measuring nitrogen monoxide (NO) concentration of the exhaust gas introduced into the inlet duct.

The apparatus may further include a controller for controlling the injection amount of the oxidant solution injected through the second injection unit according to the nitrogen monoxide (NO) concentration of the exhaust gas measured by the concentration meter.

The controller may increase the injection amount of the oxidant solution injected through the second injection unit when the nitrogen monoxide (NO) concentration of the exhaust gas measured by the concentration meter exceeds a reference value.

The controller may reduce the injection amount of the oxidant solution injected through the second injection unit when the nitrogen monoxide (NO) concentration of the exhaust gas measured by the concentration meter does not exceed a reference value.

The flow control valve may be an electric valve.

In addition, according to another embodiment of the present invention, it may further include a turbulence generator installed in the inlet duct or the absorption tower.

In addition, according to another embodiment of the present invention, it may further include a neutralization tank for neutralizing nitric acid (sulfuric acid) and the nitric acid (sulfuric acid) discharged from the absorption tank.

The neutralizing agent for the neutralization may be made of at least one of ammonia water, urea water and calcium carbonate aqueous solution.

According to the present invention, by injecting a liquid oxidant to oxidize nitrogen monoxide (NO) contained in the exhaust gas, it is possible to remove nitrogen oxides and sulfur oxides simultaneously using an organic catalyst.

As such, by adding the denitrification capability to the conventional wet flue gas desulfurization apparatus, it is possible to perform denitrification and desulfurization simultaneously at a low cost in one apparatus and process.

The effects of the present invention are not limited to the above-described effects, but should be understood to include all the effects deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a schematic diagram illustrating an apparatus according to a first embodiment of the present invention.
FIG. 2 is a front view of the second spray unit of FIG. 1. FIG.
3 is a cross-sectional view taken along AA of FIG. 2.
4 is a schematic diagram illustrating an apparatus according to a second embodiment of the present invention.
5 is a schematic diagram showing an apparatus according to a third embodiment of the present invention.
6 is a front view of the turbulence generator of FIG.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the simultaneous removal of nitrogen oxide and sulfur oxides of the exhaust gas of the present invention.

In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users or operators, and the following embodiments do not limit the scope of the present invention. It is merely illustrative of the components set forth in the claims.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification. Throughout the specification, when a part is said to "include" a certain component, it means that it may further include other components, without excluding the other components unless otherwise stated.

The apparatus of the present invention is for removing sulfur oxides and nitrogen oxides from exhaust gases such as boilers by gas-liquid contact between absorption liquid and exhaust gases. Most of the nitrogen oxides in the exhaust gas are in the form of nitrogen monoxide (NO) and some in the form of nitrogen dioxide (NO2). In addition, most of the sulfur oxides in the exhaust gas is in the form of sulfur dioxide (SO2) and about 1-2% is in the form of sulfur trioxide (SO3).

First, referring to FIGS. 1 to 3, the apparatus for simultaneously removing nitrogen oxide and sulfur oxide of exhaust gas according to the first embodiment of the present invention will be described.

The apparatus according to the first embodiment of the present invention is largely absorbent tank 100, absorption tower 200, exhaust gas inlet duct 210, exhaust gas outlet duct 220, first injection unit 300, circulation The pump 320, the second injection unit 400, the oxidant supply unit 500, the oxygen supply pipe 600, the control unit 700 and the concentration meter 800 may be made.

Looking specifically, the absorption tank 100 is stored in the absorption solution containing the organic catalyst, the absorption tank 100 may be formed to have a variety of cross-sections, such as circular or square. In the present embodiment will be described based on the square tank.

At this time, in the present embodiment, the organic catalyst may be made of oil-derived organic sulfoxides generated from oil. The organic sulfoxide corresponds to an acidic extraction material, and particularly to an organic sulfoxide obtained through oxidation of organic sulfides contained in oil.

That is, the absorbing solution is a mixture of the organic sulfoxide and water (water-in-organic sulfoxides), wherein the weight ratio of water and organic sulfoxide may be formed in a variety of from 10:90 to 90:10, Preferably from 10:90 to 50:50.

The absorption tower 200 extends to the upper portion of the absorption tank 100 and may be formed integrally with the absorption tank 100.

One side of the absorption tower 200 is provided with an exhaust gas inlet duct 210 for introducing the exhaust gas, and the other side of the absorption tower 200 has an exhaust gas outlet duct 220 for discharging the purified exhaust gas. Is provided.

In the present embodiment, the inlet duct 210 is provided on the upper left side of the absorption tower 200 based on FIG. 1, and the outlet duct 220 is provided on the lower right side of the absorption tower 200. . Accordingly, the exhaust gas flowing through the inlet duct 210 flows downward in the absorption tower 200 and is discharged through the outlet duct 220.

The positions of the inlet duct 210 and the outlet duct 220 are not limited thereto, but the exhaust gas introduced through the inlet duct 210 is injected by the first injector 300 as described below. After contact with the solution and the oxidant solution injected by the second injection unit 400 is preferably provided to be discharged through the outlet duct 220.

The second injection unit 400 for injecting the oxidant solution is installed in the absorption tower 200, and the oxidant supply unit 500 is for supplying the oxidant solution to the second injection unit 400.

In this case, the oxidizing agent may be made of at least one of H 2 O 2, NaClO 2, KMnO 4, and P 4 O 10.

The oxidant supply unit 500 includes a storage tank 520 in which an oxidant solution is stored and a supply pump 540 for supplying the oxidant solution stored in the storage tank 520 to the second injection unit 400. .

Furthermore, on the oxidant supply line through which the oxidant solution is supplied from the storage tank 520 to the second injector 400, a flow control valve V1 is installed to supply the oxidant solution supplied to the second injector 400. Allow the flow rate to be adjusted. Hereinafter, the flow rate control of the oxidant solution supplied to the second injection unit 400 will be described in detail below.

In the present exemplary embodiment, the second injection unit 400 includes a tray provided with a plurality of nozzles 410 through which the oxidant solution is injected. Specifically, as shown in FIGS. 2 and 3, the tray is formed in a grid pattern in which the plurality of nozzles 410 are provided at each point, but is not limited thereto. It may be made in a variety of shapes, such as plate shape provided.

In this case, an ultrasonic mist maker 420 may be installed in each of the plurality of nozzles 410. Accordingly, the oxidant solution is mist sprayed through the nozzle 410 to pass through the second spray unit 400. Gas-liquid contact with the exhaust gas in a larger area can be achieved, and oxidation efficiency can be improved.

To this end, the tray is provided with a solution inlet 430 for supplying an oxidant solution to the plurality of nozzles (410). That is, the inlet 430 may be provided at one side of the tray, and an oxidant solution may be supplied from the storage tank 520 to the inlet 430 through the oxidant supply line. In addition, although not shown in the drawings, the tray may also be provided with an outlet for discharging the oxidant solution.

In addition, the tray may be formed in plural and may be alternately installed on one side and the other side of the absorption tower 200. In the present embodiment, as shown in FIG. 1, two trays forming the second jetting unit 400 are provided, respectively, which are installed at one side and the side facing the inside of the absorption tower 200. . However, the two trays are installed at different heights. However, the present invention is not limited thereto, and one tray may be installed in the entire area of the cross section of the absorption tower 200.

Accordingly, the exhaust gas flowing through the inlet duct 210 flows downward in the absorption tower 200 and passes through the two trays in turn, and is injected through the second injection unit 400. Gas-liquid contact is made with the oxidant solution. The oxidant solution oxidizes nitrogen monoxide (NO) present in the exhaust gas to nitrogen dioxide (NO 2). That is, nitrogen monoxide (NO) is mostly in the exhaust gas before passing through the second injection unit 400, but nitrogen dioxide (NO2) is most in the exhaust gas passing through the second injection unit 400. .

This is because nitrogen monoxide (NO) does not dissolve well in water and does not form a compound with water or alkali, so that nitrogen monoxide (NO) contained in the exhaust gas must be oxidized with nitrogen dioxide (NO2) in order to be absorbed in the absorption solution. Because.

Specifically, the following oxidation reaction is made according to the type of oxidant.

(1) NO + H2O2-> NO2 + H2O

(2) 2NO + NaClO 2-> 2NO 2 + NaCl

(3) 2NO + KMnO4-> 2NO2 + KMnO2

(4) P4 + O2-> P4O + O

    P4O + xO2-> P4O10 + mO

    O + O2-> O3

    NO + O3-> NO2 + O2

    P4O10 + 6H2O-> 4H3PO4

In addition, a first injection unit 300 for injecting the absorption solution is installed in the absorption tower 200, and the circulation pump 320 recovers the absorption solution in the absorption tank 100 and the first injection portion. It is for supplying to the injection unit 300.

In this case, the second injection unit 400 may be installed in parallel with the first injection unit 300 in the absorption tower 200. In the present embodiment, the second injection unit 400 is the first injection unit. It is formed above the 1 injection part 300.

Accordingly, the exhaust gas introduced into the inlet duct 210 flows to the lower portion of the absorption tower 200 and is primarily in contact with the oxidant solution injected by the second injector 400. It may be in secondary contact with the absorbing solution sprayed by (300).

That is, as described above, the exhaust gas passing through the second injection unit 400 is elevated by the circulation pump 320 and comes into gas-liquid contact with the absorbing solution sprayed through the first injection unit 300. The absorption solution absorbs nitrogen dioxide (NO 2) and sulfur dioxide (SO 2) present in the exhaust gas.

Specifically, the following reaction is made in relation to nitrogen dioxide (NO 2).

(5) 2NO2 + H2O → HNO2 + HNO3

(6) 3HNO2 → HNO3 + 2NO + H2O

In addition, when both nitrogen monoxide (NO) and nitrogen dioxide (NO 2) is present in the exhaust gas, the following reaction occurs.

(7) NO + NO 2 → N 2 O 3

(8) N2O3 + H2O → 2HNO2

(9) 3HNO2 → HNO3 + 2NO + H2O

As above, nitrogen dioxide (NO 2) or nitrogen monoxide (NO) and nitrogen dioxide (NO 2) react with water to produce nitrous acid (HNO 2) or nitric acid (HNO 3) (reactions (1), (3), (4)), Since the nitrous acid (HNO 2) is an unstable intermediate product, it is decomposed again before being stably oxidized to give nitrogen monoxide (NO) (reactions (2) and (5)).

Accordingly, the absorption solution of the present invention includes an organic catalyst, in particular the organic sulfoxide in the present embodiment, the organic sulfoxide can be combined with the labile intermediate product and form a stable complex. That is, the organic sulfoxide forms a complex with the unstable nitrous acid (HNO 2) to stabilize it and prevent degradation. Specifically, free electron pairs of sulfur (S) atoms in the organic sulfoxide bond with the nitrous acid (HNO 2) to prevent its decomposition.

In addition, the following reaction is made in relation to sulfur dioxide (SO2).

(10) SO2 + H2O → H2SO3

As described above, sulfur dioxide (SO 2) is dissolved in water to produce sulfurous acid (H 2 SO 3), and since the sulfurous acid (H 2 SO 3) also corresponds to an unstable intermediate product, the reaction is reversed as the temperature increases before it is stably oxidized. SO2) may be discharged again. That is, the solubility of sulfur dioxide (SO2) decreases as the temperature rises.

In this case, in order to enhance absorption of sulfur dioxide (SO 2) and to prevent sulfurous acid (H 2 SO 3) from being decomposed and discharging sulfur dioxide again, the organic sulfoxide in the absorption solution may form a stable complex with sulfur dioxide (SO 2). Specifically, the organic sulfoxide may be bonded 1: 1 through a coordination bond of a pair of free electrons in an oxygen (O) atom and a sulfur (S) atom of sulfur dioxide (SO 2). Therefore, sulfur dioxide (SO 2) can be removed from the exhaust gas using the organic sulfoxide.

At this time, the first injection unit 300 and the second injection unit 400 is the absorption tower 200 so that the exhaust gas passing through the absorption tower 200 does not come into contact with the absorption solution and the oxidant solution does not occur. It is preferable that it is formed uniformly in all positions in the cross section of ().

Accordingly, the exhaust gas from which the nitrogen oxides and the sulfur oxides are removed is discharged through the outlet duct 220, and the absorption solution absorbing the nitrogen oxides (nitrogen dioxide) and the sulfur oxides (sulfur dioxide) is again in the absorption tank 100. Will fall inside.

At this time, water (mist) is contained in the exhaust gas flowing through the first injection unit 300 and the second injection unit 400 toward the outlet duct 220, to absorb and remove the exit duct The moisture eliminator 230 may be installed at 220.

The absorption tank 100 is provided with an oxygen supply pipe 600 for supplying an oxygen-containing gas, in this embodiment air.

As air is supplied into the absorption solution of the absorption tank 100 by the oxygen supply pipe 600, an oxidation reaction of nitrous acid (HNO 2) and sulfurous acid (H 2 SO 3) is performed in the absorption tank 100.

Specifically, the reaction is made as follows.

(11) HNO2 + 1/2 O2 → HNO3

(12) H2SO3 + 1/2 O2 → H2SO4

As described above, as the labile nitrous acid (HNO 2) and sulfurous acid (H 2 SO 3) are oxidized to stable nitric acid (HNO 3) and sulfuric acid (H 2 SO 4), the organic sulfoxide which has been bound thereto is decomposed and again combined with new nitrous acid and sulfurous acid. As such, the organic catalyst can be continuously reused.

In the absorption tank 100, a stirrer 120 may be further installed to stir the absorption solution, and as the rotary flow is formed in the absorption tank 100 by the stirrer 120, the oxygen supply pipe 600. The air supplied through) may be finely divided so that the contact area and time between the air and the absorbent solution may be increased, and the oxidation efficiency may be improved.

In addition, according to another embodiment of the present invention, the oxygen supply pipe is arranged in a plurality of spaced apart from each other along the circumferential direction of the absorption tank 100, so as to be inclined in the same direction along the circumferential direction of the absorption tank 100. It may be arranged, so that the absorption of the absorption solution may be made by the air supplied through the plurality of oxygen supply pipe without a separate stirrer.

After the reaction is carried out as described above, to remove the oxidized nitric acid (HNO3) and sulfuric acid (H2SO4) to completely remove the nitrogen oxides and sulfur oxides absorbed into the absorbent solution, the absorbent solution in the aqueous phase and the oil layer ( sulfoxide phase).

As a result, since nitric acid and sulfuric acid have a very high solubility in water, nitric acid and sulfuric acid are present in the aqueous layer, and an oil organic sulfoxide is present in the oily layer.

Accordingly, the nitric acid and sulfuric acid can be completely removed by separating and discharging only the aqueous layer from the absorption tank 100, and the oily layer may be combined with fresh water and used as an absorption solution again.

In addition, the neutralization tank 900 for neutralizing the nitric acid (sulfuric acid) and the nitric acid (sulfuric acid) discharged from the absorption tank 100 may be further included.

That is, after phase separation of the absorption solution, the aqueous layer may be discharged from the absorption tank 100 to the neutralization tank 900, and nitric acid and sulfuric acid may be neutralized through a neutralizing agent to form nitrate and sulfate.

In this case, the neutralizing agent for neutralization may be an aqueous ammonia solution. Specifically, the reaction is made as follows.

(13) HNO3 + NH4OH → NH4NO3 + H2O

(14) H2SO4 + 2NH4OH → (NH4) 2SO4 + 2H2O

Alternatively, the neutralizing agent for neutralization may be urea water. Specifically, the reaction is made as follows.

(15) 2HNO 3 + (NH 2) 2 CO + H 2 O → 2NH 4 NO 3 + CO 2

(16) H2SO4 + (NH2) 2CO + H2O → (NH4) 2SO4 + CO2

As a result, ammonium nitrate fertilizer and ammonium sulfate fertilizer can be obtained.

In addition, although not shown in the figure, the neutralizing agent may be supplied into the neutralizing tank 900 by a feed pump from a separate neutralizing agent storage tank.

However, the present invention is not limited thereto, and the neutralization tank 900 may be omitted, and a neutralizer for neutralization may be directly supplied into the absorption tank 100. Accordingly, the neutralization reaction of nitric acid and sulfuric acid is carried out in the absorption tank 100 as shown in Reaction Formulas (13), (14) or (15), (16), and nitrate and sulfate are absorbed in the absorption tank (100). Can be discharged from. That is, the nitrogen oxide and sulfur oxide in the exhaust gas can be absorbed and neutralized at the same time.

Alternatively, the neutralizing agent for neutralization may be an aqueous solution of calcium carbonate (CaCO 3), resulting in gypsum. Specifically, the reaction is made as follows.

(17) H2SO4 + CaCO3 + H2O → CaSO4, 2H2O + CO2

In addition, in order to control the flow rate of the oxidant solution supplied to the second injection unit 400, that is, to adjust the injection amount of the oxidant solution injected through the second injection unit 400, the control unit 700 And a concentration meter 800.

The concentration measuring unit 800 is for measuring the nitrogen monoxide (NO) concentration of the exhaust gas flowing into the inlet duct 210, the control unit 700 is the concentration of the exhaust gas measured by the concentration measuring unit (800) The amount of injection of the oxidant solution injected through the second injection unit 400 may be controlled according to the nitrogen monoxide (NO) concentration.

At this time, the flow control valve (V1) is made of an electric valve to adjust the flow rate by receiving an electrical signal to adjust the opening, the control unit 700 is an electrical signal to adjust the opening degree of the flow control valve (V1). can send.

Specifically, the control unit 700, the injection amount of the oxidant solution injected through the second injection unit 400 when the nitrogen monoxide concentration of the exhaust gas measured by the concentration measuring instrument 800 exceeds a reference value. Can be increased. That is, the control unit 700 may increase the flow rate of the oxidant solution supplied to the second injection unit 400 by sending an electrical signal to open the flow control valve (V1).

In addition, when the concentration of nitrogen monoxide in the exhaust gas measured by the concentration measuring instrument 800 does not exceed a reference value, the controller 700 controls the injection amount of the oxidant solution injected through the second injection unit 400. Can be reduced. That is, the control unit 700 may reduce the flow rate of the oxidant solution supplied to the second injection unit 400 by sending an electrical signal to close the flow control valve (V1).

That is, the amount of oxidant required to oxidize nitrogen monoxide (NO) in the exhaust gas to nitrogen dioxide (NO2) can be supplied.

As such, by adjusting the injection amount of the oxidant solution injected through the second injection unit 400 according to the nitrogen monoxide concentration of the exhaust gas, the oxidation of the nitrogen monoxide contained in the exhaust gas may be efficiently performed. The operation cost can be reduced by adjusting the injection amount of.

Next, a device according to a second embodiment of the present invention will be described with reference to FIG. 4.

The apparatus according to the second embodiment of the present invention is largely the absorption tank 100, the first absorption tower 1200, the second absorption tower 2200, the exhaust gas inlet duct 210, exhaust gas outlet duct 220 The first injection unit 300, the circulation pump 320, the second injection unit 400, the oxidant supply unit 500, the oxygen supply pipe 600, the control unit 700, and the concentration measuring unit 800 may be formed. have.

At this time, only a plurality of absorption towers, that is, the structure consisting of the first absorption tower 1200 and the second absorption tower 2200 is different from the first embodiment and the rest of the configuration is the same bar, mainly focusing on different parts Explain.

The first absorption tower 1200 and the second absorption tower 2200 are formed to extend to the upper portion of the absorption tank 100 to extend in parallel with each other, it may be formed integrally with the absorption tank 100.

One side of the absorption tower 200 is provided with an exhaust gas inlet duct 210 for introducing the exhaust gas, and the other side of the absorption tower 200 has an exhaust gas outlet duct 220 for discharging the purified exhaust gas. In this embodiment, the inlet duct 210 is provided in the upper left of the first absorption tower 1200, based on Figure 4, the outlet duct 220 is the second absorption tower (2200) It is provided in the upper right side of the back side.

Accordingly, the exhaust gas flowing into the first absorption tower 1200 through the inlet duct 210 flows downward in the first absorption tower 1200 and crosses the second absorption tank 100. Exhaust gas flowing into the absorption tower 2200 may flow upward in the second absorption tower 2200.

At this time, the first injection unit 300 and the second injection unit 400 is installed in the first absorption tower 1200, as in the first embodiment, the first injection unit 300 and the second The injection unit 400 is installed in parallel in the first absorption tower 1200, and the second injection unit 400 is formed above the first injection unit 300.

Accordingly, the exhaust gas introduced into the inlet duct 210 flows downward in the first absorption tower 1200 and is primarily in contact with the oxidant solution injected by the second injector 400. Secondary contact with the absorbing solution sprayed by the first spraying unit 300 may achieve the same reaction and effect as the first embodiment.

In addition, only the first injection unit 300 is installed in the second absorption tower 2200, and the exhaust gas introduced into the second absorption tower 2200 flows to an upper portion thereof, and the first injection unit 300 is disposed. It may be in contact with the absorption solution sprayed by the third).

At this time, since the second injection unit 400 is not installed in the second absorption tower 2200, the injection height of the absorption solution injected from the first injection unit 300 installed in the second absorption tower 2200 is It may be formed higher than the injection height of the absorption solution is injected from the first injection unit 300 installed in the first absorption tower (1200).

Accordingly, after passing through the first absorption tower 1200 in the second absorption tower 2200, additional absorption of nitrogen dioxide and sulfur dioxide remaining in the exhaust gas may be performed, and denitrification and desulfurization efficiency may be improved.

Finally, a device according to a third embodiment of the present invention will be described with reference to FIGS. 5 and 6.

The apparatus according to the third embodiment of the present invention is largely absorbent tank 100, absorption tower 200, exhaust gas inlet duct 3210, exhaust gas outlet duct 3220, first injection unit 3300, circulation The pump 320, the second injection unit 3400, the oxidant supply unit 500, the oxygen supply pipe 600, the control unit 700, the concentration meter 800 and the turbulence generator 3240 may be formed.

In this embodiment, the exhaust gas inlet duct 3210 and outlet duct 3220, the first injection unit 3300 and the second injection unit 3400 and the turbulence generator 3240 are further included. Only the structure is different from the first embodiment and the rest of the configuration is the same bar, so different parts will be described mainly.

In the present embodiment, the inlet duct 3210 extends from the upper side of the absorption tower 200 to the inside thereof, as shown in FIG. 5, and may extend from the central portion of the absorption tower 200. . In addition, the outlet duct 3220 is formed at an upper side of the absorption tower 200.

Accordingly, the exhaust gas flowing into the absorption tower 200 through the inlet duct 3210 is exactly the exhaust gas flowing into the absorption tower 200 through the inlet duct 3210. It flows upward in the 200 and is discharged through the outlet duct 3220.

In this case, the second injector 3400 is installed in the inlet duct 3210, and the first injector 3300 is installed in the absorption tower 200. In the present embodiment, the first injection unit 3300 is installed in all parts of the absorption tower 200 except for the inlet duct 3210, but is not limited thereto. It can also be installed inside.

The apparatus further includes a turbulence generator 3240 installed inside the inlet duct 3210. The turbulence generator 3240 is formed above the second injector 3400. Accordingly, the turbulence generator 3240 causes the turbulence of the exhaust gas flowing through the inlet duct 3210 to be generated. 2 is mixed by the oxidant solution and turbulent flow injected through the injection unit 3400 to increase the oxidation efficiency. To this end, it may further include a driver (not shown) for driving the turbulence generator 3240.

As such, the exhaust gas flowing into the absorption tower 200 through the inlet duct 3210 passes through the inlet duct 3210 and is in primary contact with the oxidant solution injected by the second injector 3400. In addition, the absorbent 200 may flow upward from the inside of the absorption tower 200, and may be secondly contacted with the absorption solution injected by the first injection unit 3300. The same reaction and effects as those of the first embodiment may be obtained. .

However, the present invention is not limited thereto, and the turbulence generator may be installed in the absorption tower 200 in the first embodiment.

According to the present invention, by injecting a liquid oxidant to oxidize nitrogen monoxide (NO) contained in the exhaust gas, it is possible to remove nitrogen oxides and sulfur oxides simultaneously using an organic catalyst.

As such, by adding the denitrification capability to the conventional wet flue gas desulfurization apparatus, it is possible to perform denitrification and desulfurization simultaneously at a low cost in one apparatus and process. Low temperature denitrification is also possible.

The present invention is not limited to the above-described specific embodiments and descriptions, and various modifications can be made by those skilled in the art without departing from the gist of the present invention claimed in the claims. Such variations are within the protection scope of the present invention.

[First Embodiment]
100: absorption tank 120: stirrer
200: absorption tower 210: exhaust gas inlet duct
220: exhaust gas outlet duct 230: moisture removal
300: first injection unit 320: circulation pump
400: second injection unit 410: a plurality of nozzles
420: mist maker 430: inlet
500: oxidant supply unit 520: storage tank
540: supply pump 600: oxygen supply pipe
700: control unit 800: concentration meter
900: Chinese tank
Second Embodiment
1200: first absorption tower 2200: second absorption tower
Third Embodiment
3210: entrance duct 3220: exit duct
3240: turbulence generator 3300: first injection unit
3400: second injection unit

Claims (18)

An absorption tank in which an absorption solution containing an organic catalyst is stored;
An absorption tower extending to an upper portion of the absorption tank;
An exhaust gas inlet duct provided at one side of the absorption tower;
An exhaust gas outlet duct provided on the other side of the absorption tower;
A first injection unit installed in the absorption tower to inject the absorption solution;
A circulation pump for supplying the absorption liquid in the absorption tank to the first injection portion;
A second injector installed in the inlet duct or the absorption tower to inject an oxidant solution;
An oxidant supply unit supplying an oxidant solution to the second injection unit; And
An oxygen supply pipe for supplying an oxygen-containing gas to the absorption tank;
Containing, simultaneous removal of nitrogen oxides and sulfur oxides of the exhaust gas. The method of claim 1,
The organic catalyst is an organic sulfoxide (oil-derived sulfoxides) produced from oil, the simultaneous removal of nitrogen oxides and sulfur oxides of the exhaust gas. The method of claim 1,
The oxidizing agent comprises at least one or more of H2O2, NaClO2, KMnO4, P4O10, nitrogen oxide and sulfur oxide simultaneous removal apparatus of the exhaust gas. The method of claim 1,
The exhaust gas flowing into the inlet duct is in primary contact with the oxidant solution injected by the second injector and in secondary contact with the absorption solution injected by the first injector. Simultaneous cargo removal device. The method of claim 4, wherein
The oxidant supply unit,
A storage tank in which the oxidant solution is stored; And
A supply pump for supplying the oxidant solution stored in the storage tank to the second injection unit;
Comprising, nitrogen oxide and sulfur oxide simultaneous removal device of the exhaust gas. The method of claim 5,
The second injection unit comprises a tray (tray) having a plurality of nozzles to which the oxidant solution is injected, nitrogen oxide and sulfur oxide simultaneous removal apparatus of the exhaust gas. The method of claim 6,
Ultrasonic mist makers are respectively provided in the plurality of nozzles, nitrogen oxide and sulfur oxide simultaneous removal device of the exhaust gas. The method of claim 6,
The tray is provided with a solution inlet for supplying an oxidant solution to the plurality of nozzles, nitrogen oxide and sulfur oxide simultaneous removal apparatus of the exhaust gas. The method of claim 6,
The tray is formed of a plurality, the nitrogen oxide and sulfur oxide simultaneous removal apparatus of the exhaust gas, which are respectively installed alternately on one side and the other side of the absorption tower. The method of claim 5,
Simultaneous removal apparatus for nitrogen oxide and sulfur oxides of the exhaust gas is installed on the oxidant supply line through which the oxidant solution is supplied from the storage tank to the second injection portion. The method of claim 10,
A concentration meter for measuring nitrogen monoxide (NO) concentration of the exhaust gas flowing into the inlet duct;
Further comprising, the simultaneous removal of nitrogen oxides and sulfur oxides of the exhaust gas. The method of claim 11,
A control unit controlling an injection amount of the oxidant solution injected through the second injection unit according to the nitrogen monoxide (NO) concentration of the exhaust gas measured by the concentration meter;
Further comprising, the simultaneous removal of nitrogen oxides and sulfur oxides of the exhaust gas. The method of claim 12,
The control unit, when the nitrogen monoxide (NO) concentration of the exhaust gas measured by the concentration meter exceeds a reference value, increasing the injection amount of the oxidant solution injected through the second injector, nitrogen oxides of the exhaust gas and Simultaneous removal of sulfur oxides. The method of claim 12,
The control unit, when the concentration of nitrogen monoxide (NO) of the exhaust gas measured by the concentration meter does not exceed the reference value, reducing the injection amount of the oxidant solution injected through the second injector, nitrogen oxides of the exhaust gas and Simultaneous removal of sulfur oxides. The method of claim 12,
The flow rate control valve is an electric valve, the simultaneous removal of nitrogen oxides and sulfur oxides of the exhaust gas. The method of claim 1,
Turbulence generators installed in the inlet duct or the absorption tower;
Further comprising, the simultaneous removal of nitrogen oxides and sulfur oxides of the exhaust gas. The method of claim 1,
A neutralization tank for neutralizing nitric acid and sulfuric acid discharged from the absorption tank;
Further comprising, the simultaneous removal of nitrogen oxides and sulfur oxides of the exhaust gas. The method of claim 17,
The neutralizing agent for neutralization is made of at least one or more of ammonia water, urea water and calcium carbonate aqueous solution, the simultaneous removal of nitrogen oxides and sulfur oxides of the exhaust gas.

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