KR100929905B1 - Bipolar Electrostatic Dielectric Aggregation Microparticle Collector - Google Patents

Abstract

The present invention relates to a bipolar composite electroelectric dielectric aggregation type microparticle collecting device using a combination of the electrical particles of the microparticles and the characteristics of the electrostatic dielectric (Di-electric) of the mist. Agglomeration by spraying in the opposite direction to ensure that the fine particles and water droplets of harmful emissions flowing into the agglomeration part are widely dispersed and introduced, thereby making the flow distribution inside the agglomeration part uniform so that the agglomeration growth is not biased toward the center or one side. The present invention relates to a bipolar composite electrostatic dielectric aggregation type microparticle collecting device having improved growth effects.

Such a bipolar composite electrostatic dielectric aggregation type microparticle collecting device of the present invention,

Anodic composite electrostatic agglomeration comprising a bipolar precharge part, a spray part of a scrubber equipped with an injector for spraying washing water, an electrostatic dielectric / positive electrode electric agglomeration part, an electrostatic precipitator provided with a high-pressure discharge electrode, and a high pressure generator In the anticorrosive microparticle collecting device,

The apparatus for dispensing the spraying unit of the scrubber includes a washing tank for storing the washing water, a pump for pumping the washing water of the washing tank, an injection nozzle unit for supplying the washing water pumped from the pump, and the spray nozzle unit. The spray nozzle is sprayed in a direction opposite to the traveling direction of the hazardous discharge so that the flow distribution of the sprayed water sprayed from the spray nozzle can be uniformly distributed in the electrostatic dielectric condensing unit. It is installed.

In addition, in order to distribute the flow distribution of the washing water sprayed from the spray nozzle uniformly in the electrostatic dielectric condensing unit, the spraying portion of the scrubber is installed, the electrostatic dielectric / The bipolar electric composite agglomerating part and the electrostatic precipitating part provided with the high-pressure discharge electrode are sequentially installed in the horizontal direction, which is the progress direction of the effluent discharge material.

Description

Apparatus for Removing the Harmful Fine Particles with Combined Negative and Positive Dielectric Agglomeration Precipitation}

The present invention relates to a bipolar composite electroelectric dielectric aggregation type microparticle collecting device using a combination of the electrical particles of the microparticles and the characteristics of the electrostatic dielectric (Di-electric) of the mist. Agglomeration by spraying in the opposite direction to ensure that the fine particles and water droplets of harmful emissions flowing into the agglomeration part are widely dispersed and introduced, thereby making the flow distribution inside the agglomeration part uniform so that the agglomeration growth is not biased toward the center or one side. The present invention relates to a bipolar composite electrostatic dielectric aggregation type microparticle collecting device having improved growth effects.

In general, the wet scrubber collection method removes dust particles by inertia collision, direct absorption, and diffusion by contacting floating dust particles in droplets, liquid films, and bubbles generated by spraying water on contaminated air. . This method is simple in structure and does not need to clean and replace the filter separately. Therefore, maintenance costs are low, and gas absorption and dust can be simultaneously collected in a single device. However, it is possible to process only relatively large particles and has a disadvantage of low dust collection efficiency.

In addition, electrostatic precipitation is a method in which particles suspended in a gas are charged by corona discharge, form an electric field therein, and are collected and removed by electrostatic force, and their performance characteristics are largely affected by the electrical resistivity of the particles to be collected. Depends. Particularly in the case of particles with high electrical resistivity, an abnormal phenomenon called 'back corona' occurs and dust collection performance is reduced. This reverse ionization phenomenon may occur when the charged particles electrically neutralize the dust particles attached to the dust collecting plate and re-scatter the particles. Therefore, dust collection performance is greatly influenced by the characteristics of particles to be collected, and an additional process for removing particles collected in the dust collecting plate is required, and in the case of gaseous emissions, it is difficult to collect.

In order to solve the above disadvantages, the present applicant has proposed a bipolar composite electrostatic dielectric aggregation type microparticle collecting device of Korean Patent No. 634490.

In the domestic patent registration No. 634490 proposed by the present applicant, the (+) corona discharge generating unit and (-) corona discharge generating (+) corona discharge in the harmful microparticles and dust collecting device (- A) a bipolar precharge portion consisting of a corona discharge generating portion; A spray section of a cleaning scrubber comprising a washing tank, a pump for circulating water in the washing tank, and a plurality of spray nozzles for spraying the circulated water so that the bipolar microparticles are filtered by spray droplets; Although the water droplets, which are formed on the vertical portion of the spray cleaning tank and are formed with a polarity due to the electric field formed between the high voltage lower electrode and the ground electrode, have bipolarity, minute harmful particles pass through the droplets while maintaining polarity. Agglomeration between droplets and secondary electroaggregation are performed between the droplets, and the polarization of water droplets passing through the dielectric agglomerates increases the residence time in the air and increases the collection efficiency as the reaction time with the fine particles increases. An electrostatic dielectric / bipolar electric composite agglomerating portion; The bipolar composite electrostatic dielectric aggregation type microparticle collecting device is formed on the vertical part of the agglomeration part and is composed of an electrostatic precipitator formed to attach large droplets to the dust collecting plate due to the high corona charge and high electric field generated at the discharge electrode to which high voltage is applied. have.

The bipolar composite electrostatic dielectric aggregation type microparticle collecting device of Korean Patent Registration No. 634490 configured as described above is electrically polarized at the front end of the scrubber so as to have a high efficiency of collecting fine harmful particles while using a conventional wet scrubber. It is a high-performance collecting device capable of effectively collecting harmful gas and collecting harmful fine particles at the same time by providing the dielectric, secondary bipolar droplet agglomerating unit and electrostatic precipitating unit at the rear stage.

However, in the bipolar composite electrostatic dielectric aggregation type microparticle collecting device presented in Korean Patent Registration No. 634490, the bipolar precharge part and the spray nozzle are installed horizontally with the direction in which the microparticles flow, and the flocculating part and the electrostatic precipitating part are located above the wet scrubber spraying part. Is installed vertically, the positive direction of the bipolar microparticles and water droplets formed by the bipolar precharge portion and the injection nozzle bent vertically when the advancing direction is bent vertically dispersed in the cross section of the agglomeration portion is not supplied uniformly, the center or Since it is biased to one side and flows inside the agglomeration part as shown in FIG. 4, there is a disadvantage in that the agglomeration part is not properly exerted. That is, the anodic microparticles and water droplets are centrally or one-sided in the agglomeration part and flow to cause agglomeration growth in the agglomeration part to be centrally or one-sided, thereby decreasing the agglomeration growth effect.

The present invention was invented to solve the above problems,

The fine particles introduced by spraying the washing water with a spray device in a direction opposite to the direction of the flow of the microparticles flowing from the front of the agglomeration unit so that the bipolar microparticles and the water droplets are not concentrated to the middle or one side of the agglomeration unit. The purpose is to improve the cohesive growth effect between the fine particles and the water droplets by making the water droplets widely dispersed so that the flow distribution of the fine particles and the water droplets is uniform within the agglomeration portion, and by lengthening the residence time in the agglomeration portion. have.

In order to achieve the above object, the positive electrode composite electrostatic dielectric aggregation type microparticle collecting device of the present invention includes a spray portion of a scrubber provided with a positive electrode precharge portion, a spray device for spraying washing water, and an electrostatic dielectric / positive electrode composite coalescing portion; In the bipolar composite electrostatic dielectric aggregation type fine particle collecting device comprising an electrostatic precipitator and a high pressure generator, the high-pressure discharge electrode is installed,

The apparatus for dispensing the spraying unit of the scrubber includes a washing tank for storing the washing water, a pump for pumping the washing water of the washing tank, a spray nozzle unit for supplying the washing water pumped from the pump, and the spray nozzle unit. It consists of a spray nozzle for spraying the washing water, the spray nozzle is sprayed in the direction opposite to the traveling direction of the hazardous emissions so that the flow distribution of the washing water sprayed from the spray nozzle is uniformly distributed in the electrostatic dielectric agglomerates Is installed.

The spraying direction is formed in a direction opposite to the traveling direction of the toxic material so that the flow distribution in the electrostatic dielectric / positive bipolar composite agglomerates is uniform.

In addition, in order to distribute the flow distribution of the washing water sprayed from the spray nozzle uniformly in the electrostatic dielectric condensing unit, the spraying portion of the scrubber is installed, the electrostatic dielectric / The bipolar electric composite agglomerating part and the electrostatic precipitating part provided with the high-pressure discharge electrode are sequentially installed in the horizontal direction, which is the traveling direction of the effluent discharge material.

A plurality of spray nozzle units of the injector for spraying the washing water of the spray portion of the scrubber is installed in a plurality or vertically installed.

That is, by installing a plurality of spray nozzle units, the sprayed washing water is distributed widely so that the electrostatic dielectric / bipolar electric composite agglomerates are uniformly supplied.

In addition, since the sprayed washing water falls to the lower side, no matter how fine, the washing water sprayed from the injector may be sprayed more from the lower portion to the upper portion.

Alternatively, the bipolar precharge unit is installed in the supply pipe for supplying harmful emissions, the spraying portion of the scrubber is installed with a spray device for spraying the washing water vertically to accommodate the harmful emissions supplied to the supply pipe for a long time; The electrostatic dielectric / bipolar electric composite agglomerating part and the electrostatic precipitating part provided with the high-pressure discharge electrode are sequentially installed, and the injection nozzle stand of the injector is installed under the electrostatic dielectric / bipolar electric composite agglomeration part, and sprays the cleaning liquid downward. Install the spray nozzle.

The spray nozzle stand of the injector installed at the front end of the agglomeration part may be sprayed with the most washing water from the outside at the center of the cross-sectional area of the agglomeration part. This is to prevent the harmful emissions (microparticles) introduced into the spraying part is biased toward the center of the flocculating part when it is introduced by changing the direction vertically. That is, the harmful discharge (fine particles) introduced by the washing water is most distributed in the central portion of the cross-sectional area of the flocculation unit is resisted by the water droplet sprayed from the center portion and diffused outward to uniformly flow into the flocculation unit.

The bipolar precharge part includes a (+) corona discharge generator for generating (+) corona discharge and a (-) corona discharge generator for generating (-) corona discharge.

In the bipolar composite electrostatic dielectric aggregation type microparticle collecting device of the present invention made as described above, the anodic microparticles and water droplets are sequentially disposed by spraying, agglomerating, and electrostatic precipitating units horizontally and horizontally in a direction in which the bipolar microparticles (harmful discharges) flow. It is characterized by a uniform inflow into the aggregation.

In addition, by spraying the washing water in the direction opposite to the flow direction of the bipolar microparticles (hazardous discharge), the bipolar microparticles and water droplets flowing into the agglomeration portion are widely diffused and introduced into the agglomeration portion. The flow is uniform, there is a characteristic that the cohesive growth effect is improved.

In addition, the bipolar microparticles presented by the other method are introduced horizontally, and when the inflow to the flocculation part is vertically inverted, the residence time of the fine particles in the spray part by spraying the washing water from the front end of the flocculation part to the spray device in the opposite direction to the inflow direction. By increasing the size, relatively large particles fall to the lower side. In addition, the anodic microparticles are diffused by the sprayed water droplets and flow into the agglomeration portion, so that the flow of the anodic microparticles and the water droplets in the agglomeration portion is uniform, thereby increasing the agglomeration growth effect. There is a feature that is improved.

Hereinafter, with reference to the accompanying drawings illustrating the concept of the present invention.

1 is a schematic view showing a bipolar composite electrostatic dielectric aggregation microparticle collecting device according to an embodiment of the present invention, a bipolar pre-charge unit (1) and the injection device is installed in the supply pipe to which harmful emissions (gas) is introduced largely; The scrubber spraying part 2 provided, the aggregation part 3 provided with the fixed pressure electrode 31, the electrostatic precipitating part 4 provided with the discharge electrode 41, and the high pressure generator 5 are comprised.

The precharge unit 1, the scrubber spraying unit 2, the agglomeration unit 3, and the electrostatic precipitating unit 4 are arranged in the advancing direction of harmful emissions (gas) flowing into the supply pipe as shown in FIG. Installed horizontally. That is, the precharge part 1, the scrubber spray part 2, the flocculation part 3, and the electrostatic precipitating part 4 are arrange | positioned in the advancing direction of harmful discharge | emission (gas), and a flow flows smoothly, and a flocculation part is carried out. (2) prevents the microparticles and water droplets from flowing into one side.

The positive polarity precharge unit 1 includes a discharge electrode for generating a positive voltage corona discharge, a ground electrode provided to correspond to the positive electrode, and a positive corona discharge generator for generating a positive corona discharge, and a high voltage charge for a negative voltage. It consists of a discharge electrode for generating a and a ground electrode provided to correspond to the (-) corona discharge generating a (-) corona discharge generating portion consisting of harmful fine particles (gas) flowing into the supply pipe is a positive pre-charge portion (1) The positive polarity of the positively charged microparticles and the negatively charged microparticles is observed.

(+) Charged microparticles and (-) charged microparticles pass through the bipolar precharged part (1) and pass through the spray generated in the spraying part (2) of the wet scrubber according to the trapping mechanism of the general wet scrubber Particles and gaseous substances are filtered by spray droplets, and most of the fine particles having a diameter of 1 micron or less pass therethrough, and the passing fine particles flow into the agglomeration unit 3 together with the sprayed water droplets.

The spraying unit 2 of the scrubber has a washing tank 21 for storing the washing water, a pump 22 for pumping the washing water of the washing tank 21, and a pumping pump 22. An injection device comprising an injection nozzle unit 23 for supplying the washing water to be supplied and an injection nozzle 24 installed in the injection nozzle unit 23 for spraying the washing water is provided.

The injection nozzle 24 is installed to be sprayed in a direction opposite to the advancing direction of harmful emissions introduced as shown in FIG. 5 so that the flow of bipolar microparticles and water droplets introduced into the agglomeration unit 3 is uniform as shown in FIG. do.

As illustrated in FIG. 7, the plurality of injection nozzle units 23 in which the plurality of injection nozzles 24 are installed may be formed in a plurality of injection nozzles so as to be wide and uniform, and are usually installed vertically, but may be installed horizontally.

In addition, since the washing water sprayed from the injection nozzle 24 falls down, it is preferable that the amount of the washing water sprayed on the upper part is higher than the lower part. That is, more injection nozzles 24 are installed in the upper part of the injection nozzle unit 23 provided as shown in FIG. Alternatively, the spray nozzle having a large amount of spray may be disposed on the upper portion so that more washing water is sprayed on the upper portion than the lower portion.

The droplets (clean water) sprayed from the spraying unit 2 are injected into the electrostatic dielectric condensing unit 3 at the rear end together with the fine particles not collected.

Due to the electric field generated between the high voltage electrode 31 and the ground electrode of the electrostatic dielectric / positive electrode composite aggregation part 3, water droplets, which are dielectrics, become bipolar, creating a small electric field between the droplets and the droplets. Since the fine particles with polarity floating between the droplets are first adsorbed to the water droplets by electric force and aggregated, the water droplets are bipolar in the droplets, but the polarity of the droplets is neutral. While continuously floating along the flow without being attached to the lower electrode of the flocculating part, the fine particles are continuously adsorbed to coagulate / grow. As the charged particles agglomerate and grow, the agglomerated droplets are charged by the positively charged particles, and a coulomb force is applied between the two anodes, so that secondary additional agglomeration between the agglomerated droplets occurs. Happen and grow into larger particles. Therefore, in the electrostatic precipitator 4, which is the rear end due to collision between particles and droplets, growth due to aggregation, and the like, only large particles are easily left, and ultimately, high efficiency collection efficiency is obtained even if the size of the electrostatic precipitator is minimized. .

Large water droplets are attached to the dust collecting plate due to the charge and the high electric field caused by the single polarity generated in the discharge electrode 41 to which the high voltage is applied while passing between the electrostatic precipitators 4 provided with the high voltage discharge electrode 41.

Figure 2 shows another embodiment of the present invention,

Install the bipolar precharge unit 1 in the supply pipe into which harmful emissions (gas) flows, and install a scrubber spray unit (2) provided with an injection device on the side thereof, so that the harmful emissions flow in a vertical direction. The supply pipe and the scrubber spraying unit 2 are installed vertically, and the coagulation unit 3 having the high voltage electrode 31 is installed above the scrubber spraying unit 2, and the electrostatic precipitating unit 4 provided with the discharge electrode 41. It is.

Injectors provided in the scrubber spraying unit 2 are provided with a plurality of spray nozzle units 23a horizontally installed at the front lower side of the condensing unit 3, and are installed in the plurality of spray nozzle units 23a. The injection nozzle 24 is installed so as to spray the washing water in the opposite direction of the traveling direction to the bipolar microparticles that are bent vertically through the bipolar precharge unit 1.

This is because harmful emissions (gas) flowing into the supply pipe are introduced into the scrubber spray unit 2 through the bipolar precharge unit 1, and the positive polar particles introduced into the scrubber spray unit 2 are bent vertically in a traveling direction. The residence time becomes longer, and the washing water is sprayed from the upper side to the lower side, so that relatively large fine particles fall to the lower side. That is, the washing water is sprayed from the upper side to the lower side, there is an effect that more fine particles fall to the lower side. In addition, the bipolar microparticles which pass through the washing water from the upper side to the lower side without being filtered out are widely diffused by the washing water (water droplets) sprayed, and are introduced into the aggregation part 3 together with the water droplets.

Bipolar microparticles and water droplets that are widely spread and introduced are improved in the cohesive growth effect by uniformly distributing the flow of the agglomerate part 3.

The aggregation part 3 and the electrostatic precipitator 4 are as described above.

1 is a schematic view showing a bipolar composite electrostatic dielectric aggregation microparticle collecting device according to an embodiment of the present invention.

Figure 2 is a schematic diagram showing a bipolar composite electrostatic dielectric aggregation fine particle collecting device according to another embodiment of the present invention.

Figure 3 is a flow distribution diagram inside the electrostatic dielectric aggregation portion of the present invention.

4 is a flow distribution diagram of a conventional electrostatic dielectric aggregate.

Figure 5 is a schematic diagram showing the spraying method of the injection nozzle in the present invention.

6 is a configuration diagram of the jet nozzle stage and the jet nozzle showing an embodiment of the present invention.

Figure 7 is a block diagram of the injection nozzle unit installed in front of the aggregation portion showing an embodiment of the present invention.

[Explanation of symbols on the main parts of the drawings]

1: Bipolar precharged part 2: Scrubber spray part

3: flocculation part 4: electrostatic precipitating part

5: high pressure generator

21: washing tank 22: pump

23, 23a: vertical jet nozzle stand 24: jet nozzle

31: high voltage electrode 41: discharge electrode of the electrostatic precipitator

Claims (8)

The positive electrode precharge part 1, the spray part 2 of the scrubber provided with the injector for spraying the washing water, the electrostatic dielectric / positive electrode composite agglomerate part 3, the electrostatic precipitator part 4 provided with the high-pressure discharge electrode, In the bipolar composite electrostatic dielectric aggregation type microparticle collecting device configured to include a high pressure generator (5), The spraying unit 2 of the scrubber, the electrostatic dielectric / positive bipolar composite agglomerating unit 3, and the high-pressure discharge electrode are disposed so that the harmful discharged charges passing through the bipolar precharge unit 1 are bent in the horizontal direction to the vertical direction. The installed electrostatic precipitator 4 is sequentially installed in the vertical direction, The apparatus for dispensing the spraying unit 2 of the scrubber includes a washing tank 21 for storing the washing water, a pump 22 for pumping the washing water of the washing tank, and a spray for supplying the washing water pumped from the pump. A nozzle nozzle 23 and a spray nozzle 24 installed in the spray nozzle stage to spray washing water, The spray nozzle 24 is installed so that the washing water sprayed from the spray nozzle is sprayed downward in a direction opposite to the direction in which the harmful discharge moves vertically, and the flow distribution of the hazardous discharge is uniform in the electrostatic dielectric agglomerating part 3. Bipolar composite electrostatic dielectric aggregation fine particle collecting device, characterized in that it is made to be distributed. The method of claim 1, Bipolar composite electrostatic dielectric aggregation type fine particle collecting device, characterized in that a plurality of injection nozzle stand 23 of the injection device for spraying the washing water of the spraying unit (2) of the scrubber is installed. The method of claim 1, The washing water sprayed from the spraying unit (2) of the scrubber is sprayed on the central portion more than the outer portion of the bipolar composite electrostatic dielectric aggregation type fine particle collecting device. The method of claim 1, The positive bipolar precharge part is characterized in that the positive bipolar composite electrostatic dielectric aggregation method consisting of (+) corona discharge generating section for generating a (+) corona discharge, and (-) corona discharge generating section for generating a (-) corona discharge Particle collecting device. delete delete delete delete

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