KR102400974B1 - Cyclone-fog filter unit - Google Patents

Abstract

The present invention relates to a cyclone fog filter. A secondary cyclone having a secondary inlet through which one air is introduced and a secondary outlet through which the air introduced from the secondary inlet turns and is discharged, and a fog nozzle that converts the fluid into fine droplets and guides the ejection. do it with
Unlike the prior art, the present invention improves the removal efficiency of fine dust among coal dust generated in thermal power plants, thereby preventing risks such as fire and explosion that may occur due to fine dust, and maintenance and repair of facilities can be easy

Description

Cyclone Fog Filter {CYCLONE-FOG FILTER UNIT}

The present invention relates to a cyclone fog filter, and more particularly, it improves the removal efficiency of fine dust among coal dust generated in a thermal power plant, thereby preventing the risk of fire, explosion, etc. that may occur due to the fine dust. , relates to a cyclone fog filter to facilitate maintenance and repair of equipment.

The amount of fine dust in Korea is increasing every year. Such fine dust is acting as a cause of serious air pollution and is threatening people's health. The average concentration of fine dust in Korea is about 45 μg/m ³ per year (1.5 times higher than LA and 2.3 times higher than the UK based on PM10). Therefore, there is a need to reduce it, and various methods are proposed for this purpose.

An example of such a method is a dust collector using a bag filter, which simply sprays water to collect dust or dust.

According to the National Air Pollutant Emissions data from the National Environment Agency, combustion in the manufacturing industry accounts for 54% of the nation's share of emissions by source. In addition, according to the air pollution emission data by city and province of the Ministry of Environment, Chungcheongnam-do was the largest emitter, and since Chungnam is densely populated with coal-fired power plants such as Boryeong and Taean, a major factor in domestic fine dust generation is coal-fired power plants. is analyzed to be

In the first half of 2018, the company is promoting the strengthening of dust prevention facilities for 39 domestic coal-fired power plants, doubling the current emission limit from basins, and dismantling old coal-fired power plants.

There are two types of fine dust generated from thermal power plants: coal ash and coal dust. Among them, coal ash removes dust with facilities such as an electric dust collector and bag filter, but development of facilities to reduce the generation of coal dust generated from coal yards and conveyor belts is still insufficient. The coal dust concentration in the coal yard and gallery room of the thermal power plant is expected to be about 15,000 to 10,000 μg/m ³ , and the need to build a system to collect it is being raised.

In particular, it is more urgent to build a system for collecting and removing coal dust generated in the indoor yard of a coal-fired power plant and the conveyor belt room (gallery room).

As a related technology, Republic of Korea Patent Publication No. 10-2131364 (Registration Date: 2020.07.01. Title of Invention: Thermal Power Plant Chimney Fine Dust Removal System) has been proposed.

The above-described technical configuration is a background technology for helping the understanding of the present invention, and does not mean a prior art widely known in the technical field to which the present invention pertains.

Coal dust generated from conventional thermal power plants has a problem that it is difficult to collect due to the fine particle size of about 30 μm, as well as a risk of fire due to ignition due to friction, making it difficult to collect with a bag filter or an electric dust collector. In addition, there is currently no collection of fine coal dust in power plants, and there is a very high possibility that fires occur frequently, especially in winter.

In particular, the existing technologies for collecting coal dust include a bag filter method (dry method) that collects coal dust with a dry method and a scrub method (wet method) that collects coal dust with a wet method. There are problems of clogging, fire and explosion, and re-scattering of fine coal dust, and in the case of the wet method, there is a problem of excessive facility and operating costs caused by separately building water treatment facilities due to excessive wastewater generation.

Therefore, there is a need to improve it.

The present invention has been devised to improve the above problems, and by organically connecting the primary cyclone, secondary cyclone, blower, fog nozzle and sludge recovery part to each other, it removes fine dust from coal dust generated in thermal power plants. An object of the present invention is to provide a cyclone fog filter that improves efficiency, can prevent risks such as fire and explosion that may occur due to fine dust, and facilitates maintenance and repair of equipment.

This outbreak collects fine dust with fine fog droplets, spraying fog droplets inside the cyclone to increase Packing Density (the number of fog droplets per volume), making the size of fog droplets smaller, and creating a cluster of fog droplets within the cyclone. An object of the present invention is to provide a cyclone fog filter, which is attached to each other by the effects of collision and interference with fine dust particles while rotating along the swirling flow of the cyclone to collect fine particles.

It is an object of the present invention to provide a cyclone fog filter to increase the retention time [Retention Time] that can increase the possibility of particle and droplet interference and collision with each other by inducing the fog droplets to move along the swirling flow.

An object of the present invention is to provide a cyclone fog filter to improve the collection efficiency of fine particles by reducing the size of droplets, increasing the packing density, and lengthening the retention time.

An object of the present invention is to provide a cyclone fog filter to prevent wastewater generation by recovering coal dust collected from the cyclone fog filter in the form of sludge and sending it to a storage tank such as a silo or a transfer facility such as a conveyor belt.

A cyclone fog filter according to the present invention includes: a primary cyclone having a primary inlet through which air containing dust is introduced, and a primary outlet through which air introduced from the primary inlet turns and is discharged; a secondary cyclone having a secondary inlet through which the air that has passed through the primary cyclone is introduced, and a secondary outlet through which the air introduced from the secondary inlet turns and is discharged; and a fog nozzle that converts the fluid into fine droplets and guides the ejection.

The fog nozzle is characterized in that it is arranged to be in contact with the air flowing into the primary cyclone.

In the primary cyclone, dust and fine droplets are combined to collect dust and descend to be removed from the lower part, and in the secondary cyclone, dust and droplets not collected in the primary cyclone are removed.

The primary cyclone includes a one-dimensional dust collecting unit forming an internal space, and a primary embedding outlet embedded into the inner space of the one-dimensional dust collecting unit.

The secondary cyclone includes a two-dimensional dust collecting unit forming an inner space, and a secondary embedding outlet embedded into the inner space of the two-dimensional dust collecting unit.

It is characterized in that the ratio of the length of the secondary dust collecting outlet to the height of the two-dimensional dust collecting unit is 2-3 times greater than the length of the primary collecting outlet compared to the height of the one-dimensional dust collecting unit.

In the two-dimensional dust collecting unit, it is characterized in that the fine droplets and the fine dust descend so that they can be combined with each other, and the residence time while turning is increased.

The average particle size of the droplets formed by spraying from the fog nozzle is characterized in that it comprises 5 to 30㎛.

The dust discharged to the primary collecting unit of the primary cyclone and the dust discharged to the secondary collecting unit of the secondary cyclone are aggregated in water in a fog state and sent to a coal storage tank or a transfer facility. It is characterized in that the occurrence is prevented.

As described above, the cyclone fog filter according to the present invention organically connects the primary cyclone, the secondary cyclone, the blower, the fog nozzle, and the sludge recovery part to each other, unlike the prior art. It is possible to improve the removal efficiency of the product, to prevent the risk of fire and explosion that may occur due to fine dust, and to facilitate the maintenance and repair of equipment.

The present invention solves the problems of dry and wet at the same time, there is no filter clogging, there is no fear of fire and explosion, and re-scattering does not occur, and the coal dust collected by fog droplets is transferred to a coal transport facility (Kenbeyer belt). ) or to a storage facility (silo), it is possible to prevent the generation of wastewater.

This outbreak collects fine dust with fine fog droplets, spraying fog droplets inside the cyclone to increase Packing Density (the number of fog droplets per volume), making the size of fog droplets smaller, and creating a cluster of fog droplets within the cyclone. As it rotates along the cyclone's swirling flow, fine dust particles adhere to each other due to the effects of collision and interference and can collect fine particles.

In the present invention, by inducing the movement of fog droplets along the swirling flow, it is possible to set a long retention time [Retention Time] that can increase the possibility of particles and droplets interfering and collide with each other.

The present invention can improve the collection efficiency of fine particles by reducing the size of the droplets, increasing the packing density [Packing Density], and lengthening the retention time [Retention Time].

1 is a block diagram of a cyclone fog filter according to an embodiment of the present invention.
2 is an enlarged view of a main part of a cyclone fog filter according to an embodiment of the present invention.
3 is a particle size distribution analysis table of coal dust by a cyclone fog filter according to an embodiment of the present invention.
4 is a conceptual diagram illustrating the collection characteristics of fog droplets and coal dust particles by a cyclone fog filter according to an embodiment of the present invention.
5 is an analysis table of the collection characteristics of fog droplets and coal dust particles by a cyclone fog filter according to an embodiment of the present invention.
6 is a graph for mapping behavior characteristics according to particle collision conditions by a cyclone fog filter according to an embodiment of the present invention.
7 is a graph comparing dust removal efficiency according to a cyclone fog filter according to an embodiment of the present invention.
8 is a photograph of a pilot device to which a cyclone fog filter according to an embodiment of the present invention is applied.
9 is data obtained by measuring the dust collection rate of a pilot device to which a cyclone fog filter according to an embodiment of the present invention is applied.
10 is an explanatory diagram of the operation of a cyclone fog filter according to an embodiment of the present invention.
11 is a photograph showing an installation state of a cyclone fog filter according to an embodiment of the present invention.
12 is data showing a measurement result of a dust collection rate of a cyclone fog filter according to an embodiment of the present invention.

Hereinafter, an embodiment of a cyclone fog filter according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a block diagram of a cyclone fog filter according to an embodiment of the present invention, and FIG. 2 is an enlarged view of essential parts of a cyclone fog filter according to an embodiment of the present invention.

3 is a particle size distribution analysis table of coal dust by a cyclone fog filter according to an embodiment of the present invention, and FIG. 4 is a fog droplet and coal dust particles by a cyclone fog filter according to an embodiment of the present invention. is a conceptual diagram of collection characteristics, and FIG. 5 is an analysis table of collection characteristics of fog droplets and coal dust particles by a cyclone fog filter according to an embodiment of the present invention.

6 is a graph for behavioral characteristic mapping according to particle collision conditions by the cyclone fog filter according to an embodiment of the present invention, and FIG. 7 is a comparison of dust removal efficiency according to the cyclone fog filter according to an embodiment of the present invention. It is one graph.

8 is a photograph of a pilot device to which a cyclone fog filter according to an embodiment of the present invention is applied, and FIG. 9 is data obtained by measuring a dust collection rate of a pilot device to which a cyclone fog filter according to an embodiment of the present invention is applied and FIG. 10 is an explanatory diagram of the operation of a cyclone fog filter according to an embodiment of the present invention.

11 is a photograph showing an installation state of a cyclone fog filter according to an embodiment of the present invention, and FIG. 12 is data showing a measurement result of a dust collection rate of the cyclone fog filter according to an embodiment of the present invention.

1 to 12 , the cyclone fog filter 100 according to an embodiment of the present invention is a facility for removing dust (hereinafter, a concept including 'dust' or 'dust'). It is a facility to remove dust generated from coal used in thermal power plants having a particle size distribution as shown in Fig. 3.

The cyclone fog filter 100 according to the present invention is, as shown in FIGS. 1 and 2 , a primary cyclone 110 , a secondary cyclone 120 , a blower 130 and a high pressure generator 140 . includes The cyclone fog filter 100 includes a sensor unit 150 and a sludge recovery unit 160 .

The primary cyclone 110 is a region in which air having dust (or including dust) forms an inner space from the primary inlet 113, the upper side is cylindrical, and the lower side is a one-dimensional dust collecting unit 117 having a conical shape. The dust, which is introduced into the furnace and has large particles, is separated by centrifugal force and centripetal force and is accumulated in the primary collecting unit 118 .

At the same time, the high-pressure water generated by the high-pressure pump 143 of the high-pressure generator 140 is sprayed into the one-dimensional dust collecting unit 117 through the fog nozzle 147, and the uncollected dust is sprayed by centrifugal force. droplet) and then it is collected and then descended to be separated from the air and collected in the primary collecting unit 118 .

Part of the dust, dust, and droplets in the air that has circulated through the one-dimensional dust collecting unit 117 through the primary inlet 113 are collected in the primary collecting unit 118 in a combined state, and the primary inlet 113 is removed. The first intake outlet 115a embedded in the central area of the space of the one-dimensional dust collecting unit 117 in a state where the dust, dust, and droplets, which are the rest of the air circling through the one-dimensional dust collecting unit 117, are somewhat clean. It moves to the secondary cyclone 120 through the primary exposure outlet 115b communicated with the primary purchase outlet 115a.

That is, the primary outlet 115 is composed of a primary buried outlet 115a buried downward in the center of the one-dimensional dust collecting unit 117 and a primary exposed outlet 115b exposed from the one-dimensional dust collecting unit 117. . In this structure, the secondary outlet 125 is also the same.

In particular, while being connected to the secondary cyclone 120, the blower 130 having the blower fan 131 induces the flow of air so that the air can move. Such a blower 130 may exist upstream of the primary cyclone 110 .

And, the droplets and dust that are not collected in the primary cyclone 110 flowing through the secondary inlet 123 communicated with the primary outlet 115 are introduced into the two-dimensional dust collecting unit 127, and after turning, the secondary It is discharged to the outside including the atmosphere through the blower line 133 of the blower 130 through the outlet 125 .

That is, fine dust containing dust from the primary inlet 113 side of the primary cyclone 110 is introduced together with air, and the upper side has a cylindrical shape and the lower side has a conical shape. The fine droplets (hereinafter, referred to as droplets) rotated and sprayed from the plurality of fog nozzles 147 disposed in the upper space of the one-dimensional dust collecting unit 117 move along the swirling flow of air, Dust and droplets are combined and adhered.

In this way, the particles combined with the droplets leave the air swirling flow and are collected in the primary collecting unit 118, which is the lower part of the one-dimensional dust collecting unit 117, and the swirling air passes through the primary outlet 115 of the one-dimensional dust collecting unit 117. Guided through the secondary cyclone 120 is introduced.

Particles and droplets that are not filtered or removed in the primary cyclone 110 are introduced into the secondary cyclone 120 . The purpose of the secondary cyclone 120 is to collect the droplets that have moved along the air when the droplets sprayed from the upper part of the primary cyclone 110 do not combine with the particles, and fine dust that is not collected in the primary cyclone 110 to collect particles.

Fine droplets collected in the primary cyclone 110 and not descended are introduced into the secondary cyclone 120 , are collected in the two-dimensional dust collection unit 127 , and are collected in the secondary collection unit 128 . The reason that the fine droplets can be collected by the secondary collecting unit 128 in this way is that the droplets and fine dust (or fine dust), which will be described later, descend from the upper side to the lower side of the two-dimensional dust collecting unit 127 having a long space in the vertical direction. can be interconnected. It has a lot of residence time while descending from the upper side of the two-dimensional dust collecting unit 127 to the lower side, and the fine droplets and fine dust are combined with each other due to the interference rather than the impact, and then the swirl flow and the self-weight It is gathered to the lower secondary collection unit 128 by the.

As an example of this, looking at the bar shown in FIG. 5, FIG. 5 (a) is a graph showing the collection efficiency due to interference, and FIG. 5 (b) is a graph showing the collection efficiency by collision. not shown much. As can be seen from the graph of FIG. 5 , the larger the particles, the higher the efficiency of trapping by collision, and the smaller the particles, the higher the efficiency of collecting by interference.

Therefore, in the primary cyclone 110, dust or dust with large particles is mainly collected and removed by collision with droplets (refer to the second figure 'Inertial Impaction' in FIG. 4), and in the secondary cyclone 120, the particles are more Fine dust or dust is mainly collected and removed by interference with droplets (refer to the third figure 'Interception' of FIG. 4).

In order to obtain this effect, the structure of the primary intake outlet 115a of the primary cyclone 110 and the secondary injection outlet 125a of the secondary cyclone 120 are different. That is, the primary intake outlet 115a of the primary cyclone 110 has a structure of a normal cyclone, and the height of the one-dimensional dust collecting unit 117 (see 'H1a' in FIG. 2(a)) and the primary intake outlet (See 'H1b' in Fig. 2(a)) In principle, the ratio of the height is about 25%, and it is designed by changing it to 15-30% depending on the type of dust particles.

On the other hand, in the two-dimensional dust collecting unit 127 of the secondary cyclone 120, the height of the secondary intake outlet 125a ( In FIG. 2(a), see 'H2b') close to the height of the two-dimensional dust collection unit 127 (see 'H2a' in FIG. 2(a)), so that the ratio of 'H2b/H2a' is about 50%. and 45~80% depending on the amount of dust and oil.

That is, compared to the primary inlet outlet 115a of the primary cyclone 110, the ratio of the secondary inlet outlet 125a of the secondary cyclone 120 to the respective cylindrical dust collecting units 117 and 127 is about 2-3. Make it about twice as big. Due to the characteristic structure of the secondary cyclone 120 , fine droplets and dust in the secondary cyclone 120 can be more effectively collected and removed compared to the prior art.

In other words, the primary cyclone 110 serves to combine dust and fine droplets to collect the dust and remove it from the lower part when descending, and the secondary cyclone 120 includes the dust not collected in the primary cyclone 110 and It serves to remove droplets. At this time, the secondary cyclone 120 has a structure capable of spraying fog and a structure not spraying it. When the concentration of dust flowing into the cyclone fog filter 100 is high, the secondary cyclone 120 is By spraying the enemy, the dust not collected in the primary cyclone 110 is collected in the secondary cyclone 120, and when the concentration of dust is low, the fog is not sprayed in the secondary cyclone 120 in the primary cyclone 110. Only uncollected fog droplets are collected.

Here, in particular, removing the fine droplets further removes fine dust to increase the removal efficiency of the dust removed from the system, eliminates the phenomenon of water accumulating in the fan due to the discharge of the droplets, and the droplets are removed from the secondary cyclone (120) When discharged downstream and attached to the pipe, which is the blowing line 133, a very small amount of coal dust that is not collected due to a lot of moisture in the pipe sticks to the blowing line 133 over time and may cause a fouling phenomenon. and to prevent the possibility of clogging the tube due to this phenomenon.

That is, the secondary cyclone 120 serves to remove fine dust particles that are not completely collected in the primary cyclone 110 , and thus, the secondary cyclone 120 does not spray fog. If necessary, a demist 135 (De-mist) capable of collecting dust, dust, etc. not collected at the rear end of the secondary cyclone 120 may be included. The demist 135 removes the droplets that do not settle in the primary cyclone 110 and the secondary cyclone 120 when the fog nozzle 147 of the primary cyclone 110 is very large because the amount of dust to be removed is large. When installing the demist 135 for collecting, there is a disadvantage that the pressure loss is large, so it is preferable not to install most of it.

In particular, the secondary cyclone 120 passes through the secondary inlet 123 and passes through the two-dimensional dust collector 127, and the remaining dust, dust, and droplets in the air are slightly cleaned. It is forcibly transferred to the blower 130 through the secondary exposure outlet 125b communicating with the secondary purchase outlet 125a through the secondary purchase outlet 125a embedded in the central region of the space.

The sludge containing dust collected by the primary and secondary collecting units 118 and 128 that is the lower part of the primary and secondary cyclones 110 and 120 is treated in the sludge recovery unit 160 . The sludge recovery unit 160, the sludge collected in the primary and secondary collection units 118 and 128 is a filtration filter including a filter press when the valve attached to the sludge pipe 161 is opened, the sludge pump 163 pressurizes the sludge. (not shown) can be used to separate the solid and liquid, and the clear filtrate can be recovered and the turbid filtrate can be transferred to a wastewater treatment plant. The sludge recovery unit 160 may be automatically operated in conjunction with the level sensors 119 and 129 installed in the primary and secondary collection units 118 and 128 . That is, when the primary level sensor 119 detects the sludge stored in the primary collection unit 118 , it generates an operation signal of the sludge pump 163 of the sludge recovery unit 160 . Similarly, when the secondary level sensor 129 detects the sludge stored in the secondary collection unit 128 , it generates an operation signal of the sludge pump 163 of the sludge recovery unit 160 .

And, after the blower 130 operates and collects dust, when dust collection in which air does not flow into the primary cyclone 110 and the secondary cyclone 120 is finished, the primary cyclone 110, 2 if necessary When water is sprayed in all directions with the cleaning nozzle 170 installed inside the primary cyclone), the mixture of droplets and dust adhering to the inner wall of the primary or two-dimensional dust collecting unit 117 or 127 is washed away. It is collected by the tea and secondary collection units (118, 128). At this time, the cleaning nozzle sprays water at a set pressure (eg, a pressure of 3 kgf/cm 2 ) while moving up and down to the primary or secondary cyclones 110 and 120 . The washing nozzle 170 receives the washing water from the washing liquid supply unit 172 at a set pressure by a set amount.

As described above, the mixture collected by the primary and secondary collecting units 118 and 128 is treated by the sludge collecting unit 160 .

In addition, the high-pressure generating unit 140 may press the water supplied from the water tank 141 for storing water at a high pressure to form required fine droplets, and as shown in FIG. 1 , a filter if necessary. , a high-pressure pump 143 , a high-pressure line 145 , which is a pipe through which water is transferred, a fog nozzle 147 , a relief valve, a pressure sensor, and various valves 148 . Here, the high pressure generator 140 is not described, but of course includes a check valve constituting a general pump system.

The high-pressure pump 143 pressurizes the water supplied from the water tank 141 and may be provided in various types of pumps. The high-pressure pump 143 is a high-pressure pump including a motor (eg, a DC motor, etc.) that rotates by power applied to a part to which the introduced water is pressurized, and a plunger type that generates high pressure in water by the rotational force of the motor. It is preferable to include and it is more preferable that the rotational speed of the motor can be varied so that the required flow rate can be adjusted.

Water pressurized at high pressure by the high-pressure pump 143 may be sprayed into predetermined droplets from the fog nozzle 147 coupled to the end of the high-pressure line 145 through the high-pressure line 145 . The fog nozzle 147 is provided in various sizes, and the average particle size of the sprayed droplets is different according to the pressure.

In particular, the dust discharged to the primary collection unit 118 of the primary cyclone 110 and the dust discharged to the secondary collection unit 128 of the secondary cyclone 120 remain aggregated in water in a fog state. The generation of wastewater is prevented as it is sent to a coal storage tank or transport facility.

On the other hand, the primary cyclone 110 and the secondary cyclone 120 is supplied with a chemical liquid therein.

In detail, the chemical liquid storage tank 180 is connected to the water tank 141 to supply the chemical liquid to the water tank 141 . After the water and the chemical are mixed in the water tank 141 , they are supplied together into the inside of the primary cyclone 110 or the inside of the primary cyclone 110 and the inside of the secondary cyclone 120 . Accordingly, the dust discharged to the primary collecting unit 118 of the primary cyclone 110 and optionally the dust discharged to the secondary collecting unit 128 of the secondary cyclone 120 are supplied from the chemical storage tank 180 . It is easily agglomerated (agglomerated) by mixing with the received chemical. Alternatively, water sprayed from the fog nozzle 147 in a mist (fog) state is polluted while coagulating with dust. As the pollutant source of this polluted water is agglomerated by the chemical, the dust and the agglomerated fine water droplets are purified.

In addition, the finer the droplets are sprayed from the fog nozzle 147, the finer the better, but it is not easy to form fine particles. It is even more desirable if ultra-fine droplets can be formed with the technology related to 'Ultra-fine droplet cyclone fog air purifier for removal, humidification, and deodorization'.

If necessary, the pressure of the fog nozzle 147 and the high pressure pump 143 may be adjusted or selected by the control unit to form very fine droplets. Here, if possible, it is preferable that the size of the droplets sprayed from the fog nozzle 147 is small. That is, the finer it is, the longer it stays in the space, the longer it can be evenly distributed in the space, the more effective it is to evaporate, and the more fine dust can be collected, which is very useful in performing each function. A rough comparison of the time spent in space according to the size of the droplet is shown in Table 1 below.

Water particle size (㎛) situation Time taken to fall 3m (sec) 5,000~2,000 heavy rain 0.05~0.9 2,000~1,000 heavy rain (spring cooler) 0.9~1.1 1,000-500 normal rain 1.1~1.6 500 to 100 light rain 1.6~11 100-50 micro fog 11-40 50-10 wet fog 40~1,000 10-2.0 dry fog 1,020 to 25,400 1.0~0.01 smoke fog floating in the air 0.01 performance floating in the air

As shown in Table 1 above, the average particle size of the droplets formed in the fog nozzle 147 according to the present invention is preferably in the range of 1 to 100 μm, preferably in the range of 2 to 50 μm, which takes a long time to stay, and more preferably 10 μm or less. The sensor unit 150 is a measuring instrument for detecting the current state or information of the space to which each function is applied, and it is to include a temperature sensor, a humidity sensor, and a dust concentration sensor capable of detecting the temperature, humidity, and dust concentration of the space. desirable. A gas sensor (not shown) capable of detecting, for example, carbon monoxide (CO), etc.) may be installed in the primary cyclone 110 to check whether gas is generated. It is preferable that one or a plurality of each of these sensor units 150 are disposed at appropriate positions according to the width of the space, the height of the floor, and the like. The control unit may control various configurations based on the detection result of the sensor unit 150 .

The control unit automatically or manually operates the blower 130 and the sludge recovery unit 160 based on the sensor unit 150 that detects information or data inside the primary cyclone 110 and the secondary cyclone 120 . can be done Here, a coagulant containing a chemical may be added to the water tank 141 in order to improve the ability to collect droplets in the process of collecting dust. When the agglomerated material is mixed with water and sprayed, the size of the combined particles is increased by allowing the droplets and dust particles to more easily combine, and the probability of being collected and descending into the lower part of the primary or secondary cyclones 110 and 120 is reduced. It is possible to increase the dust collection efficiency.

And, it is preferable that the fog nozzle 147 to which the fine droplets (or fine droplets) are injected has an orifice diameter of 0.15 mm, 0.2 mm, 0.3 mm, 0.4 mm, and 0.5 mm. In addition, as a location for installing the fog nozzle 147, it is installed only in the primary inlet 113 of the primary cyclone 110, or is installed only in the upper space of the one-dimensional dust collecting unit 117 of the primary cyclone 110, or There may be a method of installing both of the above-mentioned places.

As a result of verifying the cyclone fog filter 100 according to the present invention for coal dust or coal dust having the same particle size as in FIG. 3 , as the diameter of the coal dust decreases, it is difficult to collect, so fine particles in the cyclone fog filter 100 In order to increase the collection probability, it is necessary to control the size and/or concentration of droplets sprayed by the fog nozzle 147 . And, as the packing density (ㅱ) and the flow rate increase, the collection probability increases, so the need to optimize the flow conditions of air in the primary cyclone 110 and the secondary cyclone 120 has emerged. When the introduced coal dust turns, large particles are removed from the air by the difference between the centripetal force and centrifugal force of the swirling flow, and fine particles are removed by colliding with droplets while moving along the air.

In the present invention, in order to maximize the collision probability between droplets and coal dust, the average particle size of the droplets is reduced as much as possible to increase the droplet density within the primary and secondary cyclones 110 and 120, and the primary and two-dimensional dust collection units 118 and 128 ), it was found that the lower the flow rate and the higher the flow rate, the more the particle collection rate by the droplets tends to increase.

As shown in Figure 4, the collection of coal dust particles by droplets is based on the principles of Brownian diffusion, inertial impaction, interception, electrophoresis, and electro-scavenging. made by Here, particles with a diameter of 1 μm or more containing coal dust have a high probability of being mainly collected by collision and interference among the principles described above, and it is understood that the probability of collection increases as the size of the droplets decreases.

And, Equations (1) and (2) show the probability of collection due to collision and interference. Viscosity μ of fluid, density ρ of particles, packing density α, flow rate U of fluid, diameters of particles and droplets D _p , D _{a ,} can be expressed using water W.

[Equation 1]:

[Equation 2]:

Meanwhile, FIG. 8 is an example of a simulation result of behavioral characteristics according to particle collision conditions using a computational analysis technique.

By deriving these simulation results and empirical results, it is possible to establish data on what level of droplet particle size is most effective for dust particles of various sizes and what level of air flow is desirable. Data established in this way can be organized into AI and database, and it can be organized and managed with organized mapping.

6 shows an example of mapping behavioral characteristics according to changes in the Weber number and impact parameter when water droplet particles of the same size collide. (Bouncing), even if merged, there are cases where it stretches and falls again (Stretching, Reflexive), that is, it shows that the conditions for coalescence can be found only when the collision velocity and size are appropriately adjusted. Particle collision-related studies in the prior art were performed on large particles with a size of 100 μm to 2 mm, and the present invention mainly targets droplets and coal dust with a size of 20 to 30 μm.

7 is a graph comparing the efficiency of removing coal dust to the result of applying the cyclone fog filter 100 according to the present invention with that of the prior art. The dark part on the right is the result according to the present invention, and the bright part on the left is the result according to the prior art.

As shown in FIG. 7 , the dust collecting efficiency of the cyclone fog filter 100 according to the present invention is 99.2% (reduced from 3,498㎍/㎥ before dust concentration treatment to 28㎍/㎥ after treatment), and that of the device according to the prior art It can be seen that the dust removal efficiency is 90.5% (reduced from 3,498㎍/㎥ before dust concentration treatment to 332㎍/㎥ after treatment).

8 is a photograph showing a manufactured photo of the cyclone fog filter, a cyclone fog filter body equipped with a nozzle for spraying fog droplets, a pump station for pumping water at high pressure (referred to as a fog master), and a conveyor for the recovered coal dust sludge A pump conveying by a belt, etc. It is composed of a fan that sucks or blows air into the cyclone at a speed of 15-20 m/sec.

When collecting coal dust scattered from the conveyor belt room through this device, as shown in FIG. 9 , the inlet concentration of the cyclone fog filter was 2120.83 mg/m ³ , and the concentration at the outlet after collection by fog droplets was 7.03 mg/m ³ , the collection efficiency is 99.67%. It is estimated that most of the dust sucked into the cyclone fog filter is captured.

10 is a view showing that dust and particles are combined with each other by interference inside the cyclone fog filter body. As the dust particles and fog droplets rotate inside the cyclone along the swirl flow, they combine with each other by the interference and collision effects of <Equation 1> and <Equation 2>.

11 and 12 show a drawing and an installation photograph of a cyclone fog filter installed in a conveyor belt room where coal dust is generated at a power plant site. It consists of a cyclone fog filter body, a fan, and a pump station (fog master), and is configured to enable fully automatic operation. The dust collection efficiency is derived as shown in FIG. 13 through the operation of this device.

The dust concentration on the inlet side of the cyclone fog filter 100 was 65.55 mg/m ³ and the dust concentration on the outlet side was measured as 1.32 mg/m ³ , and the dust collection efficiency was investigated as 97.99%. This was evaluated to be very excellent in efficiency compared to the existing dust collector.

Here, in the prior art, technologies applicable to coal dust collection include a wet scrubber, a cyclone, a bag filter, and the like. The wet scrubber dust collector collects dust particles by spraying water, and unlike the present invention, it is difficult to collect fine dust particles because the size of the water particles is large, and wastewater is generated due to a large amount of water consumption. There is a disadvantage in that installation and maintenance costs are high due to separately installed and operated wastewater treatment facilities. In addition, the existing cyclone dust collector collects dust only by swirling flow, but in the case of particles with a low specific gravity such as coal dust, it is difficult to collect them, and when the particles rotate along the air in the cyclone, they are ignited by friction with each other. There is a possibility.

In addition, the filter dust collector has relatively superior dust collection efficiency compared to the conventional dust collector, but a large-scale dust collector cannot be constructed because a pressure loss proportional to the filtration speed occurs between the bag filter and the dust layer, and the friction between coal dust There is a risk of fire or explosion due to ignition.

In addition, since the system to which the cyclone fog filter 100 according to the present invention is applied has significantly less wastewater generation (1/10) compared to the wet dust collector by scrub, secondary pollutants such as wastewater treatment do not occur, and wastewater treatment It has the advantage of reducing the cost of facility and operation

In contrast, since the cyclone fog filter 100 according to the present invention collects coal dust in fine droplets, it has excellent dust collection efficiency compared to wet scrubbers, has less risk of ignition due to friction of coal dust, and low pressure loss to configure a large dust collector There are advantages to being able to The cyclone fog filter 100 utilizes the feature of spraying fine mist with a droplet size of 10 μm and falling to the lower part of the cyclone as it moves along the swirling flow in the cyclone and collides with the dust particles.

In addition, the cyclone fog filter 100 has high collision adhesion efficiency between fine droplets and dust particles, so it has excellent collection efficiency compared to conventional dust collectors, and uses less water to generate droplets, so operating costs are low, and bag filter replacement Since work such as such is unnecessary, it is possible to reduce the cost of maintenance and repair.

Accordingly, with reference to Table 2, a cyclone fog filter 100 capable of effectively removing particularly fine dust among coal dust generated in a thermal power plant may be provided.

In addition, the cyclone fog filter 100 capable of improving efficiency compared to the prior art and preventing risks such as fire and explosion that may occur due to fine dust may be provided.

In addition, the cyclone fog filter 100 may be provided, which is easier to maintain and maintain than the prior art, and is simple and convenient to use.

As a result, the dust removal system to which the cyclone fog filter 100 according to the present invention is applied collects fine dust as fine fog droplets, and the primary cyclone 110 and the secondary cyclone 120 of the cyclone fog filter 100 are By spraying fog droplets inside at least one of the By the effect of collision and interference with the dust particles, they adhere to each other and the fine particles can be maximally collected.

And, the cyclone fog filter 100 according to the present invention can set a long retention time [Retention Time] that can increase the possibility of particle and droplet interference and collision with each other by inducing fog droplets to move along the swirling flow, By reducing the size of the enemy, increasing the packing density, and lengthening the retention time, the collecting efficiency of fine particles can be further improved.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely an example, and those skilled in the art to which various modifications and equivalent other embodiments are possible. will understand Therefore, the true technical protection scope of the present invention should be defined by the following claims.

100: cyclone fog filter 110: primary cyclone
113: 1st inlet 115: 1st outlet
117: one-dimensional barrel collection unit 118: primary collection unit
120: secondary cyclone 123: secondary inlet
125: second outlet 127: two-dimensional dust collection unit
130: blower 131: blower fan
135: demist 140: high pressure generating unit
143: high pressure pump 150: sensor unit
160: sludge recovery unit 161: sludge pipe
163: sludge pump

Claims (6)

a primary cyclone having a primary inlet through which air containing dust is introduced, and a primary outlet through which the air introduced from the primary inlet turns and is discharged;
a secondary cyclone having a secondary inlet through which the air that has passed through the primary cyclone is introduced, and a secondary outlet through which the air introduced from the secondary inlet turns and is discharged; and
Containing a fog nozzle that converts the fluid into fine droplets and guides the jet,
The fog nozzle is disposed so that the fluid and the air flowing into the primary cyclone can contact,
The primary cyclone includes a one-dimensional dust collecting unit forming an inner space, and a primary embedding outlet embedded into the inner space of the one-dimensional dust collecting unit, and the secondary cyclone is a two-dimensional dust collecting unit forming an inner space, and It includes a secondary buried outlet buried toward the inner space of the two-dimensional bin dust collection unit,
The ratio of the length of the secondary dust collecting outlet to the height of the two-dimensional dust collecting unit is 2-3 times greater than the length of the primary collecting outlet compared to the height of the one-dimensional dust collecting unit,
The height of the secondary injection outlet inside the two-dimensional dust collecting unit is arranged close to the height of the two-dimensional dust collecting unit, thereby increasing the time for droplets and dust to fall while staying in the two-dimensional dust collecting unit. It is characterized in that fine droplets and fine dust are combined and combined with each other due to an interference rather than an impact, and then gather to a secondary collecting unit provided at the lower side of the secondary cyclone by vortex flow and its own weight. cyclone fog filter.
The method of claim 1,
In the primary cyclone, dust and fine droplets combine to collect the dust, descend and remove it from the lower part,
In the secondary cyclone, a cyclone fog filter, characterized in that the dust and droplets not collected in the primary cyclone are removed.
delete The method of claim 1,
A cyclone fog filter, characterized in that in the two-dimensional dust collecting unit, the fine droplets and fine dust descend so that they can be combined with each other, and the residence time while turning is increased.
The method of claim 1,
A cyclone fog filter, characterized in that the average particle size of the droplets formed by spraying from the fog nozzle is 5 to 30㎛.
The method of claim 1,
The dust discharged to the primary collecting unit of the primary cyclone and the dust discharged to the secondary collecting unit are sent to a coal storage tank or transfer facility while being aggregated in water in a fog state, so that the generation of wastewater is prevented. Cyclone fog filter, characterized in that.

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