KR100793376B1 - Hybrid scrubber system - Google Patents

Abstract

A hybrid scrubber system is provided to collect fine particles less than 1 micrometer with maintaining good gas absorbing performance, by charging fine particle and charged droplets in the opposite polarities by an ionizer and a charged droplet spray device and then collecting the fine particle by strong electric cohesion generated between the fine particle and charged droplet. A hybrid scrubber system(100) is composed of: a gas intake port(1) through which harmful gas flows in; spray devices(2,3) spraying cleansing material to purify the inflow gas; a tower packing layer(4) purifying the gas by the cleansing material jetted from the spray device; ionizers(10,11,12,13) installed at the rear side of the tower packing layer; charged droplet spray devices(14,15,16,17) installed separately from each ionizer; droplet separators(5,6) installed at an interval from the charged droplet spray devices; a circulation pump(7) circulating the cleansing material sprayed on the tower packing layer; a circulation pipe(8) connecting the circulation pump, the spray devices, and the charged droplet spray devices; and a suction blower(9) sucking the gas flowing through a gas inflow port. The inflow gas is charged with negative electricity with passing through the ionizer.

Description

Hybrid scrubber system

1 is a schematic view showing a conventional wet scrubber system,

2 is a schematic diagram of a hybrid scrubber system according to an embodiment of the present invention;

3 is a conceptual diagram of the corona charged droplet injection device used in FIG.

4 is a detailed view of the discharge electrode of the corona charged droplet injection device used in FIG.

5 is a perspective view of the corona charged droplet injection device used in FIG.

6 is a principle diagram of droplet generation of positive (+) electrodes.

<Description of the symbols for the main parts of the drawings>

100: hybrid scrubber system

1: gas inlet 2: shear injection device

3: top injector 4: filling

5: Droplet Separator (Chevron) 6: Droplet Separator (Wire Mesh)

7: Absorbent circulation pump 8: Circulation piping

9: suction blower 10: (-) pole high voltage power supply

11: ionizer insulator 12: ionizer discharge electrode

13: ionizer collector 14: (+) pole high voltage power supply

15: Insulator insulator for charged droplet ejection apparatus

16: Discharge electrode support rod for charged droplet injection device

17: Pipe for charged droplet injection device 18: Charged droplet injection nozzle

19: Grounding electrode for charged droplet injection device

20: discharge needle for charged droplet injection device

21: discharge needle support rod 22: high voltage power cable

23: Charged droplet 24: Electrically neutral droplet

25: free electron 26: cationized air molecule

27: Tally electron

The present invention relates to a scrubber system, and more specifically, to the microparticle diffusion and inertial collision mechanisms by adding an ionizer and a corona-charged electrospray device to microparticles of 1 μm or less, which could not be processed in a conventional wet scrubber system. It is for a high efficiency hybrid scrubber system with the addition of a flocculation mechanism.

In general, the conventional wet scrubber system is a device that can achieve a high gas absorption efficiency by using a packing (tower packing), and by ensuring a sufficient gas-liquid contact area, the gas absorption using the molecular diffusion force of the gas In the case of collecting particulate matter, the inertial collision mechanism is mainly used.

Such a conventional wet scrubber system has a disadvantage that the collection efficiency drops sharply from particles of 3 μm or less. However, for ultrafine particles of 0.1 μm or less, it can be expected to collect by diffusion force to some extent, but for the particles in the range of 0.1 ~ 1 μm, the mass is too small to be controlled by inertia and too big to have sufficient diffusion force. The collection efficiency cannot be achieved. Therefore, the treatment efficiency for the microparticles of 1 μm or less in the conventional wet scrubber is inevitably low (10-30%).

In the meantime, the apparatus used for the treatment of fine particles is wet electrostatic precipitator, but in order to satisfy the high treatment efficiency for particles smaller than 0.5 μm, a huge corona field is required, and the operating cost and initial installation are In terms of cost, there is an undesirable aspect in the treatment of particles of 1 탆 or less. In addition, a separate wet scrubber system is required for the absorption of harmful gases, which requires an additional cost.

As such, the conventional wet scrubber system is used to simultaneously process the gaseous material and particulate matter by simply using a filling material to secure sufficient gas-liquid contact area. The treatment efficiency for the microparticles is extremely low, so it is impossible to achieve high treatment efficiency for the pollutants, and it is not possible to suppress the white smoke phenomenon caused by the aerosol at the final outlet.

Therefore, there is a lot of demand in the art for a hybrid type scrubber system of a new structure to solve this problem.

As a result of research efforts to solve all the problems of the prior art, the present inventors add the treatment mechanism for the fine particles while maintaining the advantages of the existing wet scrubber, high efficiency that can simultaneously absorb the harmful aerosol material as well as gas absorption The hybrid scrubber system was completed.

Accordingly, an object of the present invention is to add a charged droplet injector utilizing an ionizer and a strong corona discharge, to charge the fine particles and the charged droplets in the opposite polarity, and then to mix and contact the particles to form a strong force between the fine particles and the charged droplets. The present invention provides a hybrid scrubber system having an efficient treatment of harmful substances by efficiently collecting fine particles of 1 µm or less while maintaining excellent gas absorption performance by allowing collection by electrical cohesion.

Another object of the present invention is to provide an electrostatic charging hybrid scrubber system capable of suppressing white smoke at the final outlet.

It is still another object of the present invention to provide a hybrid scrubber system that can solve the problem of advanced treatment of harmful pollutants and harmful aerosols through a low initial investment cost.

It is still another object of the present invention to provide a hybrid scrubber system that is applicable not only in a wet but also in a dry manner.

In order to achieve the above object, the present invention is a gas inlet for introducing harmful gas; An injector into which washing water for purifying the inflowing gas is injected; A filling layer in which gas is purified through the washing water sprayed from the injector; An ionizer installed behind the filling layer; Charged droplet injection device is spaced apart from the ionizer; A droplet separation device spaced apart from the charged liquid injection device; A circulation pump for circulating the washing water injected into the filling layer; a circulation pipe connecting the circulation pump, the injection device, and the charged liquid injection device; And it provides a hybrid scrubber system including a suction blower for sucking the gas flowing through the gas inlet.

The ionizer includes a negative pole high voltage power supply, an insulator, a discharge electrode, and a dust collecting pole.

The charged drop ejection device is characterized in that it comprises a (+) pole high voltage power supply, a discharge electrode insulator, a discharge electrode support rod, a pipe and a spray nozzle.

The introduced gas is characterized in that it is charged with a negative electrode while passing through the ionizer.

It is characterized in that the fine particles of the negatively charged gas is trapped in the charged drop charged by the positive charge injected by the charged drop ejection device.

The washing is characterized in that the washing liquid or washing gas.

As such, the ionizer used in the present invention charges the fine particles by corona discharge as in the conventional wet electrostatic precipitator, and the finer particles are charged by the diffusion charging mechanism. However, diffusion charge has the disadvantage of lower charging efficiency than field charging, and the smaller the particles, the smaller the charge amount is, and especially for ultra-fine particles below 0.1㎛, this method (corona charge) achieves high collection efficiency. Hard to do

Therefore, by using a hollow cone nozzle, a large droplet suitable for field charging is generated, and a conical ground electrode in consideration of the spray angle and a star or needle-shaped corona discharge electrode where high voltage is applied to the hollow center of the spray nozzle are used. The corona charged liquid spray device, which can obtain a charged liquid droplet having a high charge amount by causing positive coronal discharge and positive ionization of surrounding air molecules to be adsorbed onto the sprayed droplets, was used. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a schematic diagram of a hybrid scrubber system according to an embodiment of the present invention, Figure 3 is a conceptual diagram of the corona charged liquid injector used in Figure 2, Figure 4 is a corona charged liquid injector used in Figure 2 5 is a perspective view of the corona charged liquid droplet injector used in FIG. 2, and FIG. 6 is a principle diagram of the droplet generation of the positive electrode.

First, referring to FIG. 2, in which a hybrid scrubber system according to an embodiment of the present invention is shown, the hybrid scrubber system 100 includes a gas inlet 1, an injector 2, 3, a filling layer 4, Ionizers (10, 11, 12, l3), charged droplet injection devices (14, 15, 16, 17, 18), droplet separators (5, 6), circulation pumps (7), circulation pipes (8), And it can be seen that it includes a suction blower (9). Here, the configuration well known in the conventional scrubber system will not be described in detail.

The gas inlet 1 is a place where a gas containing harmful gas and harmful aerosol is introduced.

The injection device (2, 3) is a device for spraying the washing water for purifying the inlet gas as a shear injection device (2) located at the front end of the filling layer (4) and the top injection device (3) located at the top Is preferably provided.

In this case, the washing water sprayed by the injector may be in a liquid state or a gaseous state. When the washing water is in the gas state, a separate pipe other than the circulation pipe 8 may be further connected to the charged liquid spraying device. have.

The filling layer 4 provides a place where the introduced gas is purified through the sprayed washings.

The ionizer is installed behind the filling layer to charge the gas passing through the filling layer 4 to the negative electric charge. The negative pole high voltage power supply 10, the insulator 11, the discharge electrode 12, and the dust collecting electrode (13).

The charged liquid drop ejection device is spaced apart from the ionizer, the positive pole high voltage power supply 14 to generate a charged drop charged with a positive electrode for collecting the fine particles of the negatively charged gas, The discharge electrode insulator 15, the discharge electrode support rod 16, the pipe 17, and the injection nozzle 18 are included. More preferably, as shown in Figures 3 and 5 may further include a ground electrode 19, the discharge needle 20, the discharge needle supporting rod (21).

The circulation pump 7 provides power for circulating the washing water injected into the filling layer 4.

The circulation pipe (8) serves to connect the circulation pump (7), injectors (2, 3), the charge drop injection device.

The suction blowing device 9 serves to suck the gas introduced through the gas inlet 1.

Looking at the process of purifying the contaminated gas in the hybrid scrubber system 100 configured as described above are as follows.

First, a gas containing noxious gas and noxious aerosol flows into the gas inlet 1 through the filling layer 4 to which the wash water is supplied by the wash water circulation pump 7, and then through the shear injection device 2. While passing through the packing layer 4, gas absorption and dust collection of relatively large particles (5 mu m or more) are performed. During this process, the inlet gas also undergoes deposition by steam condensation of fine particles and decomposition of hydrolysates in the gas. Large particles and gaseous contaminants have been removed, but the gas stream still contains many harmful microparticles (less than 5 µm).

The exhaust gas containing a lot of fine particles is charged to the negative electrode while passing through the ionizer composed of the discharge electrode 12 and the collecting electrode 13. The charged fine particles meet the charged droplet 23 in a space in which positively charged droplets are injected from the strong positive corona charged droplet injector. In such agglomerated space, harmful aerosols are collected in charged droplets by charged droplets and electrical attraction, and charged droplets (20 ~ 100㎛) that collect aerosols are mainly inertial collisions in grounded mist eliminators (5, 6). Is trapped by, loses charge through ground, and becomes electrically neutral.

Thus, by using a charged droplet having a relatively large particle diameter that can be easily removed by the inertial collision mechanism, it is possible to achieve a high collection efficiency for the fine particles of less than 1㎛.

In particular, the operation principle of the corona charged liquid injection device according to the present invention with reference to Figures 3 to 5 in detail, the injection liquid supplied through the pipe 17 can be injected in a hollow cone (hollow cone) It is injected through the injection nozzle 18. The spray nozzle 18 has a constant spray angle (30 to 120 degrees), and since the spray pattern is a hollow structure, direct spraying is not performed on the discharge needle 20 of the discharge electrode located at the center, and even when spraying the nozzle, the desired degree is required. The electrical insulation of the can be maintained. The grounded hollow cone-shaped ground electrode 19 has a shape surrounding the discharge electrode 20, and a strong corona discharge is generated by an unbalanced electric field in the discharge needle 20 having a pointed tip.

Referring to FIG. 6, the inequality electric field accelerates the free electrons 25 toward the discharge electrode, and the free electrons 25 moving at high speed collide with the neutral air molecules 24. The collision causes the air molecules to lose electrons 27, and as a result, the air molecules become positive ions 26. This mechanism is reproduced by the thali electrons 27 and is repeated constantly. As a result, the positive electrode and the ground electrode are filled with a large amount of known cationized molecules 26, and the electrically neutral droplet 24 passing through this space adsorbs the cations 26 and is electrically charged. Becomes (+). According to this principle, it is possible to generate a charged liquid having a high charged state with a simpler structure than inductive charging or direct charging.

Dust collection using charged liquid droplets is effective for the collection of ultrafine particles (0.1 μm or less) that are difficult to be electrically charged by corona discharge due to their small mass and surface area, and the charged liquid droplets dominate the principle of electrostatic induction. do.

As described above, in the hybrid scrubber system 100 of the present invention, the fine particles (0.1 to 1 μm) charged to the negative electrode are mixed with the water droplets (20 to 100 μm) charged to the positive electrode, thereby providing a strong electrical Collected quickly by manpower. Ultrafine particles of 0.1 μm or less, which are not sufficiently charged in the ionizer, are electrically neutral, but are close to the charged liquid droplets and are trapped in the charged liquid droplets by electrical image force caused by electrostatic induction.

On the other hand, the present invention has been described with reference to the embodiment shown in the drawings, but this is only exemplary, those skilled in the art will understand that various modifications and equivalent embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

The present invention described above has the following excellent effects.

The hybrid scrubber system according to the present invention adds a charged droplet injection device utilizing an ionizer and a strong corona discharge, charges the fine particles and the charged droplets to the opposite polarity, and then mixes and contacts the fine particles and the charged droplets. By being able to collect by strong electrical cohesive force, while maintaining excellent gas absorption performance as it is, at the same time efficiently collecting fine particles of less than 1㎛ has a treatment efficiency of harmful substances.

The hybrid scrubber system according to the present invention can suppress white smoke at the final outlet.

The hybrid scrubber system according to the present invention opens a way to solve the problem of advanced processing and harmful aerosols of air pollutants through a low initial investment cost.

As described above, the hybrid scrubber system according to the present invention is not only applicable to the present invention through a simple modification of the existing wet scrubber system, but also has a high efficiency up to ultra-fine particles by a relatively simple device as compared to the conventional wet electrostatic precipitator. It can collect and economically remove harmful aerosols emitted from various industrial processes, which can solve the problems of advanced processing of air pollutants and civil complaints caused by white smoke.

Claims (6)

1. A gas inlet through which harmful gas is introduced;

   An injector into which washing water for purifying the inflowing gas is injected;

   A filling layer in which gas is purified through the washing water sprayed from the injector;

   An ionizer installed behind the filling layer;

   Charged droplet injection device is spaced apart from the ionizer;

   A droplet separation device spaced apart from the charged liquid injection device;

   A circulation pump for circulating the washing water injected into the filling layer;

   A circulation pipe connecting the circulation pump, the injection device, and the charged liquid injection device; And

   It includes a suction blower for sucking the gas flowing through the gas inlet,

   The introduced gas is negatively charged while passing through the ionizer hybrid scrubber system, characterized in that.
2. The method of claim 1,

   The ionizer is a hybrid scrubber system, characterized in that it comprises a (-) pole high voltage power supply, insulator, discharge electrode and dust collector.
3. The method of claim 1,

   The charged liquid injection device is a hybrid scrubber system, characterized in that it comprises a (+) pole high voltage power supply, a discharge electrode insulator, a discharge electrode support rod, a pipe and a spray nozzle.
4. delete
5. The method according to any one of claims 1 to 3,

   And the fine particles of the negatively charged gas are collected in the positively charged charged droplets injected by the charged droplet injection device.
6. The method according to any one of claims 1 to 3,

   Hybrid scrubber system, characterized in that the washing liquid or washing gas.

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