KR20210156084A - Impeller rotation type scrubber system for removing NOx-SOx-PM simultaneously - Google Patents

Abstract

The present invention relates to a rotary electrostatic spray scrubber system for simultaneously reducing SOx-NOx-PM, which can control an absorption liquid contact time by adjusting a residence time through an impeller even if a flow rate of incoming exhaust gas is low, apply high voltage to a body part, and simultaneously remove particulate and gaseous pollutants from exhaust gas by spraying fine droplets of absorbed liquid generated at the time of the application of high voltage.

Description

Impeller rotation type scrubber system for removing NOx-SOx-PM simultaneously}

The present invention relates to a rotary electrostatic spray scrubber system for simultaneous reduction of SOx-NOx-PM, and more particularly, even if the flow rate of the inflow exhaust gas is low, the absorption liquid contact time can be controlled by adjusting the residence time through the impeller. In addition, a high voltage is applied to the body and fine droplets of the absorbed liquid generated at this time are sprayed to simultaneously remove particulate and gaseous pollutants included in the exhaust gas, sulfur oxides are discharged as gypsum, and nitrogen oxides are SOx that can be discharged as nitrogen. - It relates to a rotary electrostatic spray scrubber system for simultaneous reduction of NOx-PM.

Gas emitted from thermal power plants or waste incineration contains various air pollutants such as dust, nitrogen oxides, and sulfur oxides. Among them, fine dust with a small particle size enters the human body and not only causes respiratory diseases, but also causes plant growth. have a detrimental effect on the environment, such as

In order to manage fine dust (PM2.5) with a diameter smaller than 2.5 μm, which is known to be particularly harmful among these air pollutants, the U.S. Environmental Protection Agency (EPA) and the European Union (EU) have was revised to strengthen environmental regulations on these substances.

On the other hand, gravity dust collection, inertial force dust collection, filter dust collection, cleaning dust collection, and electric dust collection techniques are generally known dust collection techniques. Gravity dust collection technology uses the gravity of particles to naturally precipitate particles as air moves. , it is effective to remove relatively large particles, but hardly removes fine particles.

On the other hand, the filtration technology for removing particles by passing gas through a filter having fine pores and the electric dust collection technology for removing particles by supplying electricity to the dust are known to have relatively high dust collection efficiency. However, in the case of filtration technology, the amount of exhaust gas is rapidly reduced because the particles block fine pores, and frequent replacement of the filter is directly related to an increase in the cost of exhaust gas treatment.

In addition, among the electrostatic precipitation technologies, the dry method proceeds in the order of particle charging, particle attachment to the dust collecting pole, detachment of particles attached to the collecting pole, and removal of particles accumulated on the dust collecting pole. There is a problem in that dust collection efficiency is lowered due to the occurrence of re-scattering and back corona depending on the particle resistivity. Water use, non-uniform water film formation of dust collecting poles, and corrosion are pointed out as major problems.

In addition, since the cyclone type particle removal device requires a minimum linearity of the exhaust gas to be introduced that can form an internal swirling flow, there is a constraint when applying the process. Therefore, in order to effectively remove the above-mentioned air pollutants, especially substances with small particles, and furthermore, to achieve enhanced air environment standards by removing various gaseous pollutants together, it is urgently necessary to develop a new dust collecting device that is economical and has high removal efficiency. situation.

Republic of Korea Patent Publication No. 1918549 Republic of Korea Patent Publication No. 1892256 Republic of Korea Patent Publication No. 1951185 Republic of Korea Patent Publication No. 1971917 Republic of Korea Patent Publication No. 1953743 Republic of Korea Patent Publication No.1995742 Republic of Korea Patent Publication No.1995733 Republic of Korea Patent Publication No. 1965189

The present invention has been devised to solve the above problems, and provides a rotary electrostatic spray scrubber system for simultaneous reduction of SOx-NOx-PM that can effectively remove particulate matter and various gaseous pollutants contained in exhaust gas, etc. at the same time aim to do

Another object of the present invention is to provide a rotary electrostatic spray scrubber system for simultaneous reduction of SOx-NOx-PM, which is easy to operate and has a simple structure, and can also reduce the amount of secondary pollutants generated.

Another object of the present invention is to provide a rotary electrostatic spray scrubber system for simultaneously reducing SOx-NOx-PM, which can be recycled by discharging sulfur oxides as gypsum and discharging nitrogen oxides as nitrogen.

The rotary electrostatic spray scrubber system for simultaneous reduction of SOx-NOx-PM of the present invention for solving the above problems includes a chelate compound and slaked lime in exhaust gas containing any one or more pollutants among particulate and gaseous pollutants an impeller rotating all-in-one scrubber 10 for injecting the absorption liquid through a high-pressure spray nozzle and a plurality of electrostatic spray nozzles; a solid-liquid separator 20 for separating a solid component and a liquid component by supplying an absorbent liquid containing a chelate compound adsorbing gypsum and nitrogen oxides discharged from the impeller rotating all-in-one scrubber; a catalyst regenerator 30 for regenerating the chelate compound by separating nitrogen from the chelate compound adsorbing the nitrogen oxide separated into the liquid phase; and a slurry tank 40 capable of supplying slaked lime slurry to have the composition of the absorbent in which the chelate compound regenerated from the catalyst regenerator is supplied to the impeller rotating all-in-one scrubber; A typical electrostatic spray scrubber system is used.

In addition, the impeller rotation type all-in-one scrubber is provided on the outer surface of the side of the circular tube 120 with the exhaust gas inlet 110 for inducing the exhaust gas derived from the upper central part, and the first absorption liquid for reacting with the gaseous pollutants an upper body portion 100 having a high-pressure injection nozzle 130 for spraying a formed in the upper center of the circular tube; a central body 200 in the form of a circular tube communicating with the upper body; and a lower body portion 300 of a lower correlative channel communicating with the central body portion, having an exhaust gas induction port formed below the center of the lower body portion and being rounded to discharge exhaust gas to the side of the lower body portion to the outside. The exhaust gas outlet 310 to make; and a liquid outlet 320 at the lower portion of the lower body.

In addition, the distribution plate 210 having a disk shape coupled to the side surface of the central body portion, and having one or more arcs formed in a radius of the disk shape smaller than the radius of the central body portion; a motor 220 formed under the distribution plate; a rotating shaft 221 extending from the driving shaft of the motor; It may include a; impellers 222 formed in plurality on the rotation shaft.

In addition, at least one second absorption liquid direct injection pipe 140 provided on the outer periphery of the upper body portion 100 to spray the second absorption liquid; a '+' lead wire connected to the scrubber; and a '-' lead wire connected to the second absorption liquid direct injection pipe 140 .

In addition, a plurality of indirect electrostatic spray nozzles 160 are formed between the circular tube 120 formed on the central axis of the upper body 100 and the direct injection pipe 140 to spray the third absorption liquid. ; a '+' lead wire connected to the scrubber; and a '-' lead wire connected to the third absorption liquid indirect electrostatic spray nozzle 160 .

In addition, an indirect electrostatic spraying ring 161 formed in an annular shape on the indirect electrostatic spraying nozzle 160 formed in the central body through the upper body; an annular indirect electrostatic spraying wiring 162 connecting a plurality of indirect electrostatic spraying rings 161 formed to correspond to the indirect electrostatic spraying nozzles; and an indirect fixing pin 163 connected to support the indirect electrostatic spray wiring 162 through the upper body portion.

In addition, the exhaust gas diffusion perforated plate 250 is formed in a vertical direction on the outer edge of the distribution plate in the form of a perforated circular tube, and is in contact with the upper body to uniformly supply the exhaust gas to the lower body; may include

In addition, the solid component separated in the solid-liquid separator includes a slurry containing particulate contaminants and gypsum (CaSO ₄ ·2H ₂ O), and the liquid component is absorbed by a chelate compound that forms a ligand with a divalent transition metal It may be an absorbent liquid containing nitrogen oxide.

In addition, the chelate compound may be a chelate compound in which a ligand including -SH or -S forms a coordination bond with a transition metal.

In addition, the catalyst regenerator separates and discharges nitrogen oxides as nitrogen through the reaction of nitrogen oxides, sulfate ions, and water absorbed in the chelate compound forming the ligand with the divalent transition metal, and the divalent transition metal and the ligand The chelate compound formed can be regenerated.

According to the rotary electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction of the present invention, fine droplets are generated by applying a high voltage and the fine droplets are brought into contact with the exhaust gas. There is an advantage in that the removal efficiency of gaseous pollutants can be improved.

In addition, since the rotary electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction of the present invention can generate fine droplets, it is possible to minimize the amount of waste liquid generated, thereby reducing secondary treatment costs.

In addition, the rotary electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction of the present invention has an advantage in that it can be recycled by discharging sulfur oxides as gypsum and nitrogen oxides as nitrogen.

In addition, the rotary electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction of the present invention uses a chelate compound formed with a divalent transition metal and ligand as an absorbent for absorbing nitrogen oxides, so it has the advantage of increasing the regeneration efficiency. have.

1 is a schematic diagram of a rotary electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction according to an embodiment of the present invention.
2 is a vertical cross-sectional view of an impeller rotating all-in-one scrubber showing an exhaust gas diffusion perforated plate of a rotating electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction according to an embodiment of the present invention.
3 is a vertical cross-sectional view of an impeller rotating all-in-one scrubber in which the exhaust gas diffusion perforated plate of the rotating electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction according to an embodiment of the present invention is not shown.
4 is a perspective cross-sectional view of an impeller rotating all-in-one scrubber of a rotating electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction according to an embodiment of the present invention.
5 is a main configuration diagram of an upper body of an impeller rotating all-in-one scrubber of a rotating electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction according to an embodiment of the present invention.
6 is a flowchart of a rotary electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction according to an embodiment of the present invention.

Hereinafter, an impeller rotary scrubber for simultaneous SOx-NOx reduction according to the present invention will be described with reference to the accompanying drawings. In the specification of the present invention, particulate pollutants refer to substances that exist in the form of particles having a size of several μm or more, and gaseous pollutants are gaseous substances that can adversely affect the human body or ecosystem, such as odor-causing substances, nitrogen oxides, and sulfur oxides. contaminants present.

In the present application, terms such as include, have, or have are intended to designate that the features, numbers, steps, components, parts, or combinations thereof described in the specification exist, and include one or more other features, numbers, steps, It should be understood that the existence or addition of operations, components, parts or combinations thereof is not precluded in advance.

In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

1 is a schematic diagram of a rotary electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction according to an embodiment of the present invention.

A post-treatment system for treating pollutants in a general power plant may include a denitrification facility, an electrostatic precipitator, a desulfurization facility, and a wet electrostatic precipitator. The denitration facility is a unit for reducing _{NOx and ammonia in the exhaust gas to H 2} O and N ₂ by meeting with a vanadium-based catalyst at an exhaust gas temperature of 350° C. or higher. The general reaction formula is as Equation (1).

4NO + 4NH ₃ + O ₂ -> 4N ₂ + 6H ₂ O Formula (1)

The electrostatic precipitator is a unit for collecting fine particles by charging the fine particles contained in the exhaust gas to '-' and attaching the fine particles to the dust collecting pole by electrostatic attraction to the '+' collecting pole. The desulfurization facility is a unit in which SO _{X is reduced to gypsum (CaSO 4} ) in contact with the limestone slurry at 100° C. or less and removed. The general reaction formula is as Equation (2).

SO ₂ + CaCO ₃ + 2H ₂ O +1/2O ₂ -> CaSO ₄ 2·H ₂ O + CO ₂ Formula (2)

Lastly, the wet electrostatic precipitator is a facility that removes ultra-fine particles, heavy metals, ultra-fine gypsum particles and sulfur mist by electrostatic force.

Therefore, the rotary electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction of the present invention is a high-pressure spray nozzle and an impeller rotating all-in-one scrubber spraying through a plurality of electrostatic spray nozzles; a solid-liquid separator for separating a solid component and a liquid component by supplying an absorbent liquid containing a chelate compound adsorbing gypsum and nitrogen oxides discharged from the impeller rotating all-in-one scrubber; a catalyst regenerator for regenerating the chelate compound by separating nitrogen from the chelate compound adsorbing the nitrogen oxide separated into the liquid phase; and a slurry tank capable of supplying slaked lime slurry to have a composition of the absorbent in which the chelate compound regenerated from the catalyst regenerator is supplied to the impeller rotating all-in-one scrubber. A system may be configured.

The absorbent liquid may be supplied through a plurality of nozzles.

The absorbent liquid may be supplied branched into a first absorbent liquid, a second absorbent liquid, and a third absorbent liquid.

The plurality of electrostatic spray nozzles may include a wet electrostatic spray nozzle and a dry electrostatic spray nozzle.

The exhaust gas flows into the impeller rotating all-in-one scrubber, and at this time, a mixture of a chelate compound that forms a divalent transition metal and a ligand and slaked lime is sprayed in the same fluid flow direction.

At this time, nitrogen oxides are absorbed by a chelate compound that forms a ligand with a divalent transition metal, and sulfur oxides react with slaked lime to form gypsum. In addition, the fine particles are in contact with the fine droplets sprayed from the electrostatic spray unit to form a fine particle slurry. At the lower end of the impeller rotating all-in-one scrubber, the nitrogen oxide absorbent liquid, gypsum and fine particle slurry are discharged to the lower end, and the exhaust gas from which the contaminants are removed is discharged through the connection direction outlet. The SOx-NOx-PM simultaneous reduction reaction equation is the same as Equations (3) to (5).

(De-NOx) Fe ²⁺ -ligand + NO(g) -> Fe ²⁺ -ligand-NO (l) Formula (3)

(De-Sox) SO ₂ + Ca(OH) ₂ + 2H ₂ O + 1/2O ₂ -> CaSO ₄ ·2H ₂ O (s) Formula (4)

(De-PM) Direct/Indirect impaction with electrospray water droplet Equation (5)

The nitrogen oxide absorbent liquid, gypsum, and fine particle slurry in a mixed state of the solid and liquid phase may be fed into a solid-liquid separator to separate the nitrogen oxide absorbent liquid component and the solid phase component of the gypsum and fine particle slurry. The solid-liquid separator may be a decanter.

The gypsum separated and discharged from the decanter may be stored in the gypsum storage tank 60 .

The divalent transition metal chelate compound absorbing liquid into which the nitrogen oxide has been absorbed is introduced into a catalyst regenerator, and through the reaction of nitrogen oxides, sulfate ions, and water absorbed in the chelate compound forming a ligand with the divalent transition metal, nitrogen oxides are nitrogen is separated and discharged, and the chelate compound forming a ligand with the divalent transition metal can be regenerated. The regenerated chelate compound and slaked lime slurry having formed a ligand with a divalent transition metal is a chelate compound having formed a ligand with a slaked lime and/or a divalent transition metal that is insufficient according to the pH monitoring of the impeller rotating type all-in-one scrubber in a chelate compound tank and / or it can be supplied replenishment from the slurry tank.

The divalent transition metal may be Fe. The reaction formula may be Equations (6) to (8).

Fe ²⁺ -ligand + SO ₃ ^2- + H ₂ O -> 2Fe ²⁺ -ligand + SO ₄ ^2- + 2H ⁺ Formula (6)

Fe ²⁺ -ligand + NO + SO ₃ ^2- -> 2Fe ²⁺ -ligand + SO ₄ ^2- + N ₂ O Formula (7)

SO ₃ ^2- + N ₂ O -> SO ₄ ^2- + N ₂ Formula (8)

It is a chelate compound capable of adsorbing nitrogen oxides in a liquid phase, and among them, a chelate compound in which a ligand containing -SH or -S forms a coordination bond with a transition metal. Compared with Fe-EDTA, the chelate compound can slow the oxidation rate of iron divalent to trivalent even in an oxidizing (oxygen) atmosphere, and has the advantage of increasing the absorption rate and amount of nitrogen oxides.

In addition, the chelate according to the present invention has a high NOx adsorption rate and a high adsorption capacity, so the removal efficiency is high, and it is possible to remove a lot of nitrogen oxides in a smaller amount than in Patent Document 1.

2 is a vertical cross-sectional view of an impeller rotating all-in-one scrubber showing an exhaust gas diffusion perforated plate of a rotating electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction according to an embodiment of the present invention.

3 is a vertical cross-sectional view of an impeller rotating all-in-one scrubber in which an exhaust gas diffusion perforated plate of a rotating electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction according to an embodiment of the present invention is not shown.

2 and 3, the impeller rotating all-in-one scrubber according to the first embodiment of the present invention includes an upper body part 100, a central body part 200, a lower body part 300, and a scrubber body and It consists of a '+' lead wire connected and a '-' lead wire connected to the direct injection pipe 140 .

More specifically, the lower body part has a conical shape of a sang-gwang-hyuk structure that gradually decreases in cross-sectional area as it goes down, and the central body part is vertically erected in a long cylindrical shape having a predetermined height and inner diameter. In addition, the upper body part serves as the upper casing of the scrubber of the present invention, and injects the exhaust gas inlet into which exhaust gas is introduced and the first absorbent liquid at high pressure to mix with the exhaust gas and absorb nitrogen oxides and sulfur oxides in the exhaust gas. It may include a spray nozzle.

An exhaust gas inlet 110 for inducing exhaust gas containing one or more pollutants of particulate pollutants and gaseous pollutants is provided at a predetermined position of the upper body part, and at the bottom of the lower body part, the exhaust gas is removed from the introduced exhaust gas. A liquid outlet is provided for discharging various pollutants and the sprayed liquid. Although not shown in the drawings, it is obvious that a valve for opening and closing may be provided at the liquid outlet.

On the ceiling of the upper body part, a circular pipe having an exhaust gas inlet for introducing exhaust gas including pollutants is formed on the central axis, and the exhaust gas inlet has a smaller diameter than the circular pipe.

Here, the scrubber body is made of a conductive material so that a positive (+) charge can be applied, and the accompanying drawings show that the horizontal cut surface is circular, but polygons other than triangles such as squares, pentagons, hexagons, etc.

The high-pressure injection nozzle, which first comes into contact with the exhaust gas introduced through the exhaust gas inlet, consists of a nozzle pipe and a nozzle tip. Specifically, the nozzle pipe is formed on the central axis of the circular pipe to inject the absorbent liquid from the outside into the circular pipe at high pressure.

The insertion position of the nozzle pipe is not limited to the insertion position as long as the contact efficiency between the exhaust gas and the absorbent liquid injected at high pressure increases. Preferably, an insertion position may be formed at the lower end of the exhaust gas inlet. It is obvious that the nozzle tip may have various shapes as long as the first absorbent liquid can be sprayed over the entire area of the circular tube. Preferably, the injection pressure may be 1 bar or more, and more preferably 5 bar or more. The high-pressure injection nozzle may be formed in plurality or may be formed in a bundle form.

An exhaust gas inlet 110 for inducing exhaust gas containing one or more pollutants of particulate and gaseous pollutants is provided on the outer surface of the side of the circular tube 120 derived from the upper central part, and reacting with the gaseous pollutants an upper body portion 100 having a high-pressure injection nozzle 130 for spraying a first absorption liquid for the purpose formed in the upper center of the circular tube;

The central body part 200 in the form of a circular tube communicating with the upper body part; And

Including;

an exhaust gas outlet 310 having an exhaust gas guide hole formed downwardly in the center of the lower body part and being rounded to discharge exhaust gas to the outside through a side surface of the lower body part; and a liquid outlet 320 at the lower portion of the lower body.

The exhaust gas inlet may be coupled to the circular tube in an orthogonal form, and may be coupled in a tangential direction.

4 is a perspective cross-sectional view of an impeller rotating all-in-one scrubber of a rotating electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction according to an embodiment of the present invention.

5 is an enlarged view of an upper body of an impeller rotating all-in-one scrubber of a rotating electrostatic spray scrubber system for simultaneous SOx-NOx-PM reduction according to an embodiment of the present invention.

A distribution plate 210 having a disk shape coupled to a side surface of the central body, and having one or more arcs having a radius of the disk shape smaller than the radius of the central body.

The distribution plate may serve to induce a flow of the exhaust gas including the first absorption liquid injected through the upper body to the outermost side of the central body and the lower body.

The shape of the distribution plate is not limited as long as it uniformly guides the exhaust gas to the outer shells of the central body and the lower body.

The distribution plate may have distribution grooves formed radially based on a central point so that the first absorption liquid contained in the exhaust gas may uniformly flow to the side surface of the central body portion.

The distribution groove may be formed in a spiral shape to induce a swirling flow of the exhaust gas.

It is apparent that the design of the distribution grooves and the spiral direction may be variously changed according to the conditions of the exhaust gas including the input first absorption liquid.

The distribution plate may be formed in a cone shape around a central point.

A cone-shaped distribution cone 230 may be additionally formed above the central point of the distribution plate to uniformly distribute the exhaust gas input from the upper body to the distribution plate.

The distribution cone also has the effect of preventing corrosion of the motor from the exhaust gas and the absorption liquid.

An exhaust gas diffusion perforated plate 250 formed in a circular band shape to be connected to the upper surface of the distribution plate and the lower part of the upper body portion may be additionally formed.

The exhaust gas diffusion perforated plate may be of a porous material or a mesh shape.

a motor 220 formed under the distribution plate; a rotating shaft 221 extending from the driving shaft of the motor; It may include a; impellers 222 formed in plurality on the rotation shaft. The motor may be made of an acid-resistant material that can withstand the exhaust gas.

A microchannel 211 may be formed in the distribution plate.

The microchannel may be formed in a spiral shape to induce a swirling flow of the exhaust gas.

The microchannel is configured for directing the flow of liquid after the exhaust gas swirl flow function and/or the high pressure part.

The rotation shaft may be made of an acid-resistant material that can withstand the exhaust gas.

The impeller may be made of an acid-resistant material that can withstand the exhaust gas.

At least one material of the motor, the rotation shaft, and the impeller may be an acid-resistant stainless alloy or a metal material coated with an inorganic material on the surface.

at least one second absorption liquid direct injection pipe 140 provided on the outer periphery of the upper body portion 100 to spray the second absorption liquid; a '+' lead wire connected to the scrubber; and a '-' lead wire connected to the second absorption liquid direct injection pipe 140 .

It is obvious that the '+' lead wire and the '-' lead wire connected to the scrubber and the second absorption liquid direct injection pipe may be connected in reverse.

When a high voltage is applied while supplying an absorbent liquid having the same configuration as the direct injection pipe, minute droplets are generated between the inner wall surface of the scrubber and the injection pipe.

To explain the principle of the electrospray method using such a high voltage, when a high voltage of positive (+) and negative (-) is applied while passing the conductive liquid through the nozzle, the ions in the nozzle and the liquid become liquid by repulsive force and attractive force. moves to the surface. At this time, when the Coulomb repulsion force becomes a force greater than the surface tension, it is sprayed into fine droplets, and when the voltage applied to the electrode is small, the electric force acting on the curved surface of the liquid and the repulsive force of the cations are smaller than the surface tension of the liquid, so the droplets are not sprayed, but the voltage is not applied. When it is increased, the electric force acting on the curved surface of the liquid and the repulsive force of positive ions become larger than the surface tension of the liquid, and the droplet is sprayed from the capillary tip.

An insulating insulator 150 for preventing the upper body portion 100 and the second absorption liquid direct injection pipe 140 from being electrically energized may be further provided on the outer surface of the second absorption liquid direct injection piping. .

The insulating insulator is not limited to the material as long as it is a non-conductive material. Preferably, it may be Teflon.

The pipe for direct injection of the second absorption liquid has a long cylindrical shape with one side open to supply the second absorption liquid and the other side closed, and the one or more direct non-conductive electrostatic spray tubes 141 are formed on the circumferential surface. can be

A direct electrostatic spray nozzle 142 for spraying the second absorption liquid to the inner side surface of the lower body 300 may be further provided in the direct non-conductive electrostatic spray tube 141 .

The direct non-conductive electrostatic spray tube may be formed in a line at equal intervals or predetermined intervals in the pipe for injecting the second absorbent liquid.

The diameter of the electrostatic spray nozzle coupled to the direct non-conductive electrostatic spray tube is not limited to the size of the injection amount of the second absorption liquid and the size of the electrostatic spray nozzle as long as electric charge can occur in a state in which a short circuit does not occur.

A plurality of direct non-conductive electrostatic spray tubes may be formed coaxially with the second absorption liquid injection pipe.

The plurality of direct non-conductive electrostatic spray tubes formed coaxially with the second absorbent liquid injection pipe may be formed at an angle of 90 degrees or more and 180 degrees or less to an adjacent direct non-conductive electrostatic spray tube.

Preferably, the angle may be 120 degrees or more and 160 degrees or less, and more preferably 140 degrees. If it is out of the above angle range, electrostatic spray generation and spraying effect may be reduced.

The direct injection pipe for supplying the second absorption liquid is surrounded by an insulating insulator 150 to prevent a short circuit.

The insulating insulator may be formed of a non-conductive material such as an inorganic material or plastic.

The pipe communicating with the direct injection pipe and inserted into the upper body part may be formed as a direct non-conductive electrostatic spray pipe 141 .

In the direct non-conductive electrostatic spray tube, a wire (not shown) connected to a '-' lead wire for energization may be inserted therein.

The wire inserted into the direct non-conductive electrostatic spray tube may be in contact with the direct conductive electrostatic spray tube 143 .

The direct non-conductive electrostatic spray tube and the direct conductive electrostatic spray tube may be connected to each other by an energizing connector 144 .

The energizing connector may be in the form of a screw, and as long as it can connect the direct non-conductive electrostatic spray tube and the direct conductive electrostatic spray tube, it is obvious that the connection type is not limited.

The direct non-conductive electrostatic spray tube may be formed of a non-conductive material, and a short circuit may not occur even when it comes into contact with the upper body.

a plurality of indirect electrostatic spray nozzles 160 formed between the circular pipe 120 formed on the central axis of the upper body 100 and the direct injection pipe 140 to spray the third absorption liquid; a '+' lead wire connected to the scrubber; and a '-' lead wire connected to the third absorption liquid indirect electrostatic spray nozzle 160 .

A first high-pressure cleaning nozzle 170 may be formed between the circular tube formed on the upper body and the indirect electrostatic spray nozzle.

A plurality of indirect electrostatic spray nozzles may be formed on the same radius around the circular tube.

The first high-pressure cleaning nozzle may be formed in the middle of a gap between the plurality of indirect electrostatic spray nozzles.

A plurality of direct electrostatic spray nozzles may be formed on the same radius with respect to the circular tube.

A second high-pressure cleaning nozzle 180 may be formed between the direct electrostatic spray nozzle and the indirect electrostatic spray nozzle.

The second high-pressure washing nozzles may be formed in the same position as the first high-pressure washing nozzles formed in plural in which only a radius is increased.

The number of the first high-pressure washing nozzle, the second high-pressure washing nozzle, and the indirect electrostatic spraying nozzle may be the same. The number of the first high-pressure washing nozzles may be six.

an indirect electrostatic spray ring 161 formed in an annular shape on the indirect electrostatic spray nozzle 160 formed in the central body part through the upper body part; an annular indirect electrostatic spraying wiring 162 connecting a plurality of indirect electrostatic spraying rings 161 formed to correspond to the indirect electrostatic spraying nozzles; and an indirect fixing pin 163 connected to support the indirect electrostatic spray wiring 162 through the upper body portion.

In the scrubber device using the conventional liquid spray method, it is difficult to collect particles having a small particle size because the sprayed droplets are large, and there is a problem that the secondary treatment cost is increased due to the use of an excessive amount of liquid.

However, since the scrubber in the present invention generates droplets using the electrostatic spraying method as described above, the diameter of the droplets is very small. Since the aggregation phenomenon of the liver does not appear, the initial diameter can be maintained for a long time, and it is possible to collect various contaminants including fine particles having a particle diameter of 0.1 μm or less.

On the other hand, the high voltage is not particularly limited as long as electrostatic spraying is possible and the voltage at which the heat of the insulating material is destroyed. Preferably, it may be 2-10 kV/cm, and the distance between the tip of the nozzle and the wall surface of the lower body is 5~ It is preferable that it is 20 cm.

a bearing 223 connected to the other end of the rotation shaft; It may include a; support 224 for fixing the bearing in the space.

The support may be coupled to a side surface of the lower body at one or more locations.

Preferably, four locations may be coupled to the side surface of the lower body in a 90 degree radial direction with respect to the bearing.

It is apparent that the support is not limited in its shape as long as it does not impede the flow of the exhaust gas. Preferably, it may be rod-shaped.

The lower body part 300 communicating with the middle body part 200 may form a shape of a correlative lower narrowing while forming a predetermined lower angle α in the central axis direction from the vertical direction of the outer surface of the middle body part.

The lower angle α is not limited to the angle as long as calcium sulfate generated by the reaction of the absorption liquid and the exhaust gas and/or particulate matter aggregated through electrostatic spraying smoothly moves in the direction of the liquid outlet.

Preferably, the lower angle may be greater than 0 degrees and less than 90 degrees, more preferably 5 degrees or more and 45 degrees or less, and very preferably 20 degrees.

If it is out of the lower angle, the removal of the particulate matter may not be smooth.

and a main wiring ring 240 connecting the second absorption liquid injection pipe 140 .

The main wiring 240 may connect the ends of the plurality of second absorption liquid injection pipes inside the lower body part.

The main wiring functions to firmly position the pipe for injecting the second absorbent liquid inside the scrubber.

The main wiring may have a circular, oval, or polygonal shape by connecting a plurality of pipes for injecting the second absorbent liquid.

Three or more auxiliary wires made of a circular or polygonal shape may be further provided inside the main wiring ring.

In the auxiliary wire, three or more auxiliary wires may be arranged in a radial form around one circular auxiliary wire.

The main wiring may further include one or more electrode guide rods facing the liquid outlet.

Additionally, an electrode guide rod is attached to the main wiring ring to maximize discharge efficiency, and the electrode guide rod has a pin shape of a predetermined length, and a plurality of the electrode guide rods are arranged spaced apart from each other at a predetermined interval so as to face the liquid outlet.

The main wiring has a function of applying a voltage, and deviates from the form of applying a voltage to each water pipe exposed to the outside, and applies a voltage to only one of the water pipes exposed to the outside, Voltage application of the remaining water pipe may be formed in such a way that a voltage is applied by the main wiring formed therein.

The main wiring may be made of an electrically conductive material.

The linear velocity of the exhaust gas introduced through the exhaust gas inlet may be a linear velocity at which a swirling flow cannot be formed.

In order for the scrubber to be coupled to the exhaust gas removal process, the exhaust gas forms a swirling flow inside the scrubber to remove particulate pollutants, sulfur oxides, and nitrogen oxides contained in the exhaust gas. Secure a minimum residence time shall.

In general, a cyclone type pollutant treatment mechanism requires a minimum linear velocity at the inlet of the exhaust gas to form a swirling flow. In general, when exhaust gas flows into the cyclone at a linear speed of 10 m/sec or more, the residence time through the swirling flow can be secured.

However, depending on the flow rate of the exhaust gas, there are many limiting conditions in securing the residence time for the removal of cyclone-type particles, sulfur oxides, and nitrogen oxides.

Therefore, as in the scrubber of the present invention, it is possible to control the residence time of the exhaust gas through the forced rotation through the impeller inside.

The linear velocity of the exhaust gas for this purpose may be 2 m/sec.

The injection pipe may be formed while maintaining a predetermined distance from the central body portion and the lower body portion to generate electrostatic spraying.

The impeller may be formed to have a predetermined distance from the pipe for injection.

The first absorption liquid and the second absorption liquid may be distributed in a predetermined ratio to absorb sulfur oxides and nitrogen oxides contained in the exhaust gas.

A diameter of the circular tube may be greater than a diameter of the exhaust gas outlet.

A diameter of the liquid outlet may be greater than a diameter of the exhaust gas outlet.

The diameter of the circular tube may be greater than the diameter of the liquid outlet.

The liquid outlet is connected to the water treatment tank and

The water treatment tank may include a first drain for separating the absorption liquid; and a surge pump for removing particulate residues.

a gas analyzer at the rear end of the exhaust gas outlet; connected, and the flow rate of the exhaust gas and supply amounts of the first absorbent and the second absorbent may be adjusted according to the gas composition of the exhaust gas. The absorption liquid may be Ca(OH)2, Fe ²⁺ EDTA.

The injection angle β with respect to the central axis of the high-pressure injection nozzle may be greater than 0 degrees and less than 180 degrees.

The injection angle may be greater than 0 degrees and less than 180 degrees. Preferably, it may be 90 degrees or more and 140 degrees or less, and more preferably 100 degrees or more and 120 degrees or less. Very preferably, it may be 112 degrees.

When the injection angle is out of the range, the contact efficiency between the exhaust gas and the first absorption liquid may be reduced.

The inner end of the circular tube of the high-pressure injection nozzle may be located at a lower end of the exhaust gas inlet.

The circular tube, the exhaust gas outlet inlet 311 and the liquid outlet may all be formed on the same axis.

As above, a specific part of the present invention has been described in detail. For those of ordinary skill in the art, these specific descriptions are only preferred embodiments, and the scope of the present invention is not limited thereby, It is obvious to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention, and it is natural that such variations and modifications fall within the scope of the appended claims.

10: Impeller rotary all-in-one scrubber
20: solid-liquid separator
30: catalyst regenerator
40: slurry tank
50: chelate tank
60: gypsum storage tank
100: upper body portion
110: exhaust gas inlet
120: round tube
130: high pressure injection nozzle
140: direct injection pipe
141: direct non-conductive electrostatic spray tube
142: direct electrostatic spray nozzle
143: direct conductive electrostatic spray tube
144: energized connector
150: insulator
160: indirect electrostatic spray nozzle
161: indirect electrostatic spraying ring
162: indirect electrostatic spraying wire
163: indirect electrostatic spray fixing pin
170: first high-pressure washing nozzle
180: second high pressure washing nozzle
200: central body portion
210: distribution plate
220: motor
221: rotation shaft
222: impeller
223: bearing
224: support
230: distribution cone
240: main wiring
250: exhaust gas diffusion perforated plate
300: lower body
310: exhaust gas outlet
311: exhaust gas outlet inlet
320: liquid outlet

Claims (10)

an impeller rotating all-in-one scrubber that injects an absorption liquid containing a chelate compound and slaked lime into exhaust gas containing at least one of particulate and gaseous pollutants through a high-pressure injection nozzle and a plurality of electrostatic spray nozzles;
a solid-liquid separator for separating a solid component and a liquid component by supplying an absorbent liquid containing a chelate compound adsorbing gypsum and nitrogen oxides discharged from the impeller rotating all-in-one scrubber;
a catalyst regenerator for regenerating the chelate compound by separating nitrogen from the chelate compound adsorbing the nitrogen oxide separated into the liquid phase; and
A rotary electrostatic spray scrubber system for simultaneously reducing SOx-NOx-PM including a slurry tank capable of supplying slaked lime slurry to have the composition of the absorbent in which the chelate compound regenerated from the catalyst regenerator is supplied to the impeller rotating all-in-one scrubber .
According to claim 1,
The impeller rotating type all-in-one scrubber is
The exhaust gas inlet 110 for inducing the exhaust gas is provided on the outer surface of the side surface of the circular tube 120 which is drawn out and formed in the upper central part, and the high-pressure injection nozzle 130 for spraying the first absorption liquid to react with the gaseous pollutants. The upper body portion 100 formed in the upper center of the circular tube;
a central body 200 in the form of a circular tube communicating with the upper body; and
Including;
an exhaust gas outlet 310 having an exhaust gas guide hole formed downwardly in the center of the lower body part and being rounded to discharge exhaust gas to the outside through a side surface of the lower body part; and a liquid outlet 320 in the lower part of the lower body part; a rotary electrostatic spray scrubber system for simultaneous reduction of SOx-NOx-PM.
3. The method of claim 2,
It has a disk shape coupled to a side surface of the central body,
a distribution plate 210 in which one or more arcs are formed in which the radius of the disk shape is smaller than the radius of the central body;
a motor 220 formed under the distribution plate;
a rotating shaft 221 extending from the driving shaft of the motor;
A rotary electrostatic spray scrubber system for simultaneous reduction of SOx-NOx-PM, including a plurality of impellers 222 formed on the rotating shaft.
3. The method of claim 2,
at least one second absorption liquid direct injection pipe 140 provided on the outer periphery of the upper body portion 100 to spray the second absorption liquid;
a '+' lead wire connected to the scrubber; and
A rotary electrostatic spray scrubber system for simultaneous reduction of SOx-NOx-PM including a '-' lead wire connected to the second absorption liquid direct injection pipe 140 .
5. The method of claim 4,
a plurality of indirect electrostatic spray nozzles 160 formed between the circular pipe 120 formed on the central axis of the upper body 100 and the direct injection pipe 140 to spray the third absorption liquid;
a '+' lead wire connected to the scrubber; and
A rotary electrostatic spray scrubber system for simultaneously reducing SOx-NOx-PM including a '-' lead wire connected to the third absorption liquid indirect electrostatic spray nozzle 160 .
6. The method of claim 5,
an indirect electrostatic spray ring 161 formed in an annular shape on the indirect electrostatic spray nozzle 160 formed in the central body part through the upper body part;
an annular indirect electrostatic spraying wiring 162 connecting a plurality of indirect electrostatic spraying rings 161 formed to correspond to the indirect electrostatic spraying nozzles;
A rotary electrostatic spray scrubber system for simultaneously reducing SOx-NOx-PM including; an indirect fixing pin 163 connected to support the indirect electrostatic spray wiring 162 through the upper body.
4. The method of claim 3,
Formed in the vertical direction on the outer edge of the distribution plate in the form of a circular tube with a perforated surface,
A rotary electrostatic spray scrubber system for simultaneous reduction of SOx-NOx-PM, including; in contact with the upper body, an exhaust gas diffusion perforated plate 250 for uniformly supplying the exhaust gas to the lower body.
According to claim 1,
The solid component separated in the solid-liquid separator includes a slurry containing particulate contaminants, gypsum (CaSO ₄ ·2H ₂ O),
The liquid component is a rotary electrostatic spray scrubber system for simultaneous reduction of SOx-NOx-PM, which is an absorption liquid containing nitrogen oxide absorbed in a chelate compound that forms a divalent transition metal and a ligand.
According to claim 1,
The chelate compound is a rotary electrostatic spray scrubber system for simultaneous reduction of SOx-NOx-PM, which is a chelate compound formed by a ligand containing -SH or -S by coordination with a transition metal.
9. The method of claim 8,
In the catalyst regenerator, nitrogen oxides are separated and discharged as nitrogen through the reaction of nitrogen oxides, sulfate ions, and water absorbed in the chelate compound forming the ligand with the divalent transition metal, and the divalent transition metal and the ligand are formed. A rotary electrostatic spray scrubber system for simultaneous reduction of SOx-NOx-PM that is regenerated by chelate compounds.

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