JP6939719B2 - Particle recovery device and particle recovery method - Google Patents

Description

The present invention relates to a particle recovery device and a particle recovery method for separating and recovering a group of particles composed of fine particles contained in a gas, intermediate particles having a mass larger than the fine particles, and coarse particles having a mass larger than the intermediate particles. ..

Conventionally, a technique for separating and recovering particles contained in a gas with high efficiency and a high removal rate has been an important issue in various industries.
Generally, particles contained in a gas are separated from the gas by using one or a combination of gravity, inertial force, centrifugal force, diffusion, electrostatic force and the like. Supplement The combination is appropriately selected depending on the particle size, particle properties, particle concentration in gas, and the like.
Here, as a particle recovery method for separating and recovering a group of particles having a particle size distribution of fine particles having a particle size of 10 μm or less, intermediate particles having a particle size of 10 μm to 100 μm, and coarse particles having a particle size of 100 μm or more contained in the gas, for example. , The one shown in Patent Document 1 is known.

The particle recovery method shown in Patent Document 1 includes a first recovery step of selectively separating and recovering a part of coarse particles and intermediate particles from the gas group, and filtering the remaining coarse particles and fine particles with a filter. It consists of a second collection process in which the particles are collected at the same time.
According to this particle recovery method, the backwash interval of the filter can be lengthened while maintaining a high recovery rate. Here, the reverse cleaning of the filter means that when the filter is clogged and the pressure loss of the gas flow reaches a predetermined value, the particles are separated and removed by instantly flowing a high-pressure gas into the filter in the reverse direction. means.

Japanese Patent No. 4071993

However, the particle recovery method shown in Patent Document 1 has the following problems.
That is, although the backwashing interval of the filter has been extended, the filter is still used in the second recovery step, and the backwashing of the filter is completely eliminated or the filter replacement is not required. I couldn't.
Therefore, the present invention has been made to solve this conventional problem, and an object of the present invention is to use a simple method without using a filter and to have a larger mass than fine particles and fine particles contained in a gas. The present invention relates to a particle recovery device and a particle recovery method for separating and recovering an intermediate particle and a group of particles composed of coarse particles having a mass larger than that of the intermediate particle from a gas.

In order to achieve the above object, the particle recovery device according to one aspect of the present invention is a group of particles composed of fine particles contained in a gas, intermediate particles having a larger mass than the fine particles, and coarse particles having a larger mass than the intermediate particles. Is a particle recovery device that separates and recovers the gas from the gas, and by colliding and mixing the gas with water stored inside, the coarse particles and the intermediate particles are separated and recovered from the gas. A first particle recovery mechanism that agglomerates the fine particles into a first mist having a mass equivalent to that of the intermediate particles by a first mist generated when the gas is made to collide with the water, and the first particle recovery mechanism. The second mist is sprayed onto some of the fine particles that are not aggregated into the first mist by the first particle recovery mechanism, and the fine particles are made into a second mist having the same mass as the intermediate particles. The particle agglomeration mechanism that agglomerates, the first mist that is installed on the downstream side of the particle agglomeration mechanism and agglomerates the fine particles by the first particle recovery mechanism, and the second mist that agglomerates the fine particles by the particle agglomeration mechanism. Is provided with a second particle recovery mechanism that separates and recovers from the gas.

Further, in the particle recovery method according to another aspect of the present invention, a group of particles composed of fine particles contained in a gas, intermediate particles having a mass larger than the fine particles, and coarse particles having a mass larger than the intermediate particles is obtained from the gas. A particle recovery method for separating and recovering, in which the coarse particles and the intermediate particles are separated and recovered from the gas by colliding and mixing the gas with water stored inside the first particle recovery mechanism. At the same time, a first recovery step of agglomerating the fine particles into a first mist having a mass equivalent to that of the intermediate particles by a first mist generated when the gas is made to collide with the water, and the first recovery step. By the particle agglomeration step of spraying the second mist onto some of the fine particles that are not agglomerated by the first mist and aggregating the fine particles into the second mist having the same mass as the intermediate particles, and the first recovery step. The gist is that the first mist in which the fine particles are aggregated and the second recovery step in which the second mist in which the fine particles are aggregated by the particle aggregation step are separated from the gas and recovered are included.

According to the particle recovery device and the particle recovery method according to the present invention, a group of particles composed of fine particles, intermediate particles having a larger mass than the fine particles, and coarse particles having a larger mass than the intermediate particles by a simple method without using a filter. Can be provided as a particle recovery device and a particle recovery method capable of separating and recovering particles from a gas.

It is a schematic block diagram of the particle recovery apparatus which concerns on 1st Embodiment of this invention. It is an enlarged view of the part shown by the arrow A in FIG. It is a graph which shows the relationship between the abundance ratio of the particle contained in a gas, and the mass of a particle before the 1st recovery step. It is a graph which shows the relationship between the abundance ratio of the particle contained in a gas and the mass of a particle after the first recovery step. It is a graph which shows the relationship between the abundance ratio of the 1st mist contained in a gas after a 1st recovery step, and the mass of a mist. It is a graph which shows the relationship between the abundance ratio of the 1st mist and the 2nd mist contained in the gas after a particle agglutination step, and the mass of the 1st mist and the 2nd mist. 6 is a graph showing the relationship between the abundance ratio of the first mist and the second mist contained in the gas after the second recovery step and the mass of the first mist and the second mist. It is a schematic block diagram of the particle recovery apparatus which concerns on 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, arrangement, etc. of the components. It is not specified in the following embodiments.
The drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the plane dimension are different from the actual ones, and there are parts where the relationship and ratio of the dimensions are different between the drawings.

(First Embodiment)
FIG. 1 shows a schematic configuration of a particle recovery device according to a first embodiment of the present invention.
The particle recovery device 1 shown in FIG. 1 is composed of fine particles D3 (see FIGS. 1 and 2), intermediate particles D2 (see FIG. 2) and coarse particles D1 (see FIG. 2) contained in the combustion gas (gas). The particle group is separated from the combustion gas and recovered.
Here, the fine particles D3 are generally particles having a mass of 1.84 × 10 ^{-5 to} 4.96 × 10 ^-4 (mg), and the intermediate particles D2 are larger in mass than the fine particles D3 and have a mass of 4.96 × 10. particles ^{-4 ~6.30 × 10 -3 (mg)} , the coarse particles D1 is mass than the intermediate particles D2 larger mass 6.30 × ¹⁰ -3 ~1.84 × ¹⁰ -2 in (mg) Means particles.

The particle recovery device 1 includes a first particle recovery mechanism 10, a particle aggregation mechanism 30, and a second particle recovery mechanism 40.
The first particle recovery mechanism 10 is connected to a second pipe 3 branching from a first pipe 2 connected to a combustion gas generation source (not shown). A bypass valve 6 is connected to the exit side of the branch point to which the second pipe 3 of the first pipe 2 is connected, and by closing the bypass valve 6, the combustion gas from the combustion gas generation source is shown. As shown by the bold arrow in 1, it is sent to the second pipe 3 side.

The first particle recovery mechanism 10 is a so-called wet scrubber, and by colliding and mixing the combustion gas containing the above-mentioned particle group with the water W stored inside, the coarse particles D1 and the intermediate particles D2 are mixed. Separated from combustion gas and recovered. Further, the first particle recovery mechanism 10 aggregates the fine particles D3 into the first mist M1 having the same mass as the intermediate particles D2 by the first mist M1 generated when the combustion gas collides with the water W.
The first particle recovery mechanism 10 includes a particle recovery main body 11 having a gas inlet 11a connected to the second pipe 3 on the inlet side and a gas outlet 11b connected to the third pipe 4 on the outlet side. ing. The gas inlet 11a is formed above one side surface (right side surface in FIG. 1) of the particle recovery main body 11, and the gas outlet 11b is formed above the particle recovery main body 11.

Water W introduced from the water absorption port 22 is stored below the inside of the particle recovery main body 11, and the amount of the water W is kept constant by the overflow portion 18. A seal pot 19 is provided below the overflow portion 18, and a drainage pipe 21 is connected to the drainage port 20 of the seal pot 19. Then, the drainage discharged from the drainage discharge pipe 21 is discharged to the tar pit 23.
Then, inside the particle recovery main body 11, the second end extending in the vertical direction and the lower end being immersed in water is arranged at a predetermined interval from the wall portion on one side (right side in FIG. 1) of the particle recovery main body 11. 1 Guide plate 12 is provided. A gas guide portion 13 that communicates with the gas inlet 11a and extends in the vertical direction is formed between the wall portion of the particle recovery main body 11 and the first guide plate 12. A throat portion 14 through which the gas from the gas guide portion 13 passes is provided in a lower portion of the first guide plate 12 located in the water.

Further, inside the particle recovery main body 11, a second guide plate 12 is arranged at a predetermined interval in the direction opposite to the wall portion of the particle recovery main body 11 and extends in the vertical direction so that the lower end is immersed in water. A guide plate 15 is provided. A scrubbing portion 16 is formed between the second guide plate 15 and the first guide plate 12 in which the combustion gas that has passed through the throat portion 14 becomes a vortex.
Further, inside the particle recovery main body 11, a draining plate 17 is provided which is arranged above the upper end of the second guide plate 15 at a predetermined interval.

Next, the particle agglutination mechanism 30 is installed in a third pipe 4 which is on the downstream side of the first particle recovery mechanism 10 and is connected to the exit side of the first particle recovery mechanism 10.
The particle agglutination mechanism 30 sprays the second mist M2 on some of the fine particles D3 that are not aggregated by the first mist M1 by the first particle recovery mechanism 10 to make the fine particles D3 a second mist having the same mass as the intermediate particles D2. Aggregates into M2. As shown in FIGS. 1 and 2, most of the fine particles D3 are aggregated in the first mist M1, but some of the fine particles D3 are not aggregated in the first mist M1 and are not aggregated in the first mist M1. Enter the third pipe 4 from the outlet 11b. Therefore, the particle agglutination mechanism 30 sprays the second mist M2 onto some of the fine particles D3 that are not agglomerated by the first mist M1 by the first particle recovery mechanism 10, and the fine particles D3 have the same mass as the intermediate particles D2. 2 Make it aggregate in mist M2.

The particle agglutination mechanism 30 is composed of a plurality of mist nozzles 31 arranged at a predetermined pitch along the pipe length direction in the third pipe 4. Each mist nozzle 31 is connected to a water supply source (not shown) and welded to the third pipe 4. Each mist nozzle 31 sprays the second mist M2 on some of the above-mentioned fine particles D3 that are not aggregated by the first mist M1 by the first particle recovery mechanism 10, and the above-mentioned fine particles D3 have the same mass as the intermediate particles D2. It aggregates in the second mist M2.

Further, the second particle recovery mechanism 40 is on the downstream side of the particle agglutination mechanism 30 and is connected to the outlet side of the third pipe 4, and the outlet side is connected to the first pipe 2 via the fourth pipe 5. ing.
The second particle recovery mechanism 40 is a so-called mist separator, and is a first mist M1 in which fine particles D3 are aggregated by the first particle recovery mechanism 10 and a second mist M2 in which fine particles D3 are aggregated by the particle aggregation mechanism 30. Is separated from the combustion gas and recovered.
Here, the second particle recovery mechanism 40 includes a particle recovery main body 41 having a gas inlet pipe 42 connected to the third pipe 4 on the entry side. The gas inlet pipe 42 is provided above the particle recovery main body 41.

Centrifugal force that gives centrifugal force to the combustion gas from which the first mist M1 and the second mist M2, in which the fine particles D3 flowing in from the gas inlet pipe 42 are aggregated, and the particle group are removed, is located above the inside of the particle recovery main body 41. The giving portion 43 is provided.
Further, an exhaust duct 44 for discharging combustion gas is provided inside the particle recovery main body 41, and the exhaust duct 44 includes a gas inlet 45 and a gas outlet 46 led out to the outside of the particle recovery main body 41. There is. A fourth pipe 5 branching from the first pipe 2 is connected to the gas outlet 46. Further, the fourth pipe 5 is provided with a drain valve 47 for draining the water accumulated in the fourth pipe 5.
A seal pot 49 is provided at the bottom of the particle recovery main body 41 via a connecting pipe 48, and a drainage pipe 50 is connected to the drainage port of the seal pot 49. Then, the drainage discharged from the drainage discharge pipe 50 is discharged to the tar pit 23.

Next, FIG. 1 describes a particle recovery method for separating and recovering a group of particles composed of coarse particles D1, intermediate particles D2, and fine particles D3 contained in a combustion gas (gas) by the particle recovery device 1. A detailed description will be given with reference to FIG. 7.
The particle recovery method includes a first recovery step performed by the first particle recovery mechanism 10, a particle aggregation step performed by the particle aggregation mechanism 30, and a second recovery step performed by the second particle recovery mechanism 40. I'm out.
First, the combustion gas (gas) contains a group of particles composed of fine particles D3, intermediate particles D2 having a mass larger than the fine particles D3, and coarse particles D1 having a mass larger than the intermediate particles D2. Then, before the first recovery step, as shown in FIG. 3, the abundance ratios of the fine particles D3, the intermediate particles D2 and the coarse particles D1 contained in the combustion gas have a normal distribution with respect to the mass of the particles. ing.

Then, in the first recovery step, the combustion gas containing the above-mentioned particle group flows in the first pipe 2 and the second pipe 3 in the direction of the bold arrow shown in FIG. 1, and the first particle recovery mechanism 10 Enters the inside of the particle recovery main body 11 from the gas inlet 11a of the particle recovery main body 11 of the above. Then, the combustion gas collides with the first guide plate 12 and descends in the gas guide portion 13 along the first guide plate 12. Then, as shown in FIG. 2, the combustion gas passes through the throat portion 14 at high speed while colliding with the water surface of the water W, winds up the water W, and inside the second guide plate 15 and the particle recovery main body 11. Collide with the wall. Then, the combustion gas becomes a vortex at the scrubbing portion 16, mixes with the water W, and the coarse particles D1 and the intermediate particles D2 are separated from the combustion gas and recovered in the water W. The water W from which the coarse particles D1 and the intermediate particles D2 have been recovered is discharged to the tar pit 23 via the overflow portion 18, the seal pot 19, the drain port 20 of the seal pot 19, and the drainage pipe 21. As a result, as shown in FIG. 4, the abundance ratio of the fine particles D3, the intermediate particles D2, and the coarse particles D1 contained in the combustion gas is such that the coarse particles D1 and the intermediate particles D2 are almost eliminated, and the fine particles D3 are mainly contained in the combustion gas. It will be in the state of being contained in.

Then, when the combustion gas collides with the water surface of the water W, a shear force equal to or higher than the surface tension is applied to the water surface of the water W to generate the first mist M1. Then, the fine particles D3 in the combustion gas are aggregated in the first mist M1 by the first mist M1 having a mass equivalent to that of the intermediate particles D2 having a larger mass than the fine particles D3, as shown in FIG. As a result, the relationship between the abundance ratio of the first mist M1 contained in the combustion gas and the mass of the first mist M1 is shown in FIG.
Then, the first mist M1 in which the combustion gas from which the coarse particles D1 and the intermediate particles D2 have been removed and the fine particles D3 are aggregated is separated by the draining plate 17 and discharged from the gas outlet 11b into the third pipe 4.

As shown in FIGS. 1 and 2, most of the fine particles D3 are aggregated in the first mist M1, but some of the fine particles D3 are not aggregated in the first mist M1 and are not aggregated in the first mist M1. Enter the third pipe 4 from the gas outlet 11b of the above.
Therefore, in the next particle agglutination step, the second mist M2 is sprayed on some of the fine particles D3 that are not agglomerated by the first mist M1 in the first recovery step, and the fine particles D3 have a second mass equivalent to that of the intermediate particles D2. It is designed to aggregate in mist M2.

In this particle agglutination step, the second mist M2 is sprayed from a plurality of mist nozzles 31 onto some of the fine particles D3 that are not aggregated by the first mist M1 discharged into the third pipe 4, and the fine particles D3 are sprayed as intermediate particles D2. Aggregates into a second mist M2 having the same mass as. As a result, the first mist M1 having a mass less than the mass of the intermediate particles D2 (mist having a mass of less than 4.96 × 10 ^-4 in FIG. 5) is also aggregated in the second mist M2 and contained in the combustion gas. The relationship between the abundance ratios of the 1 mist M1 and the 2nd mist M2 and the mass of the 1st mist M1 is shown in FIG. That is, some of the fine particles D3 that are not aggregated in the first mist M1 by the first recovery step are aggregated in the second mist M2 having the same mass as the intermediate particles D2, and the mist having a mass less than the mass of the intermediate particles D2. The abundance ratio becomes smaller.

Next, in the second recovery step, the combustion gas from which the coarse particles D1 and the intermediate particles D2 discharged into the third pipe 4 are removed is the gas inlet of the particle recovery main body 41 of the second particle recovery mechanism 40. It flows downward from the tube 42 into the inside of the particle recovery main body 41. Further, the first mist M1 in which the fine particles D3 are aggregated in the first recovery step and the second mist M2 in which the fine particles D3 are aggregated in the particle aggregation step are the gas of the particle recovery main body 41 of the second particle recovery mechanism 40. It flows downward from the inlet pipe 42 into the inside of the particle recovery main body 41.

Then, the combustion gas, the first mist M1 and the second mist M2 are subjected to centrifugal force by the centrifugal force applying portion 43, and move downward while swirling in the vicinity of the wall portion of the particle recovery main body 41. Here, the first mist M1 and the second mist M2 having the same mass as the intermediate particles D2 move outward by centrifugal force, and the combustion gas having a small mass moves toward the center, and centrifugation is performed. At this time, since the abundance ratio of the mist having a mass less than the mass of the intermediate particles D2 is reduced by the above-mentioned particle agglutination step, the first mist M1 and the second mist M2 are surely outward due to the centrifugal force. Moving.

The first mist M1 and the second mist M2 in which the fine particles D3 are aggregated, which have moved outward inside the particle recovery main body 41, move downward, pass through the connecting pipe 48, and drain from the seal pot 49. After 50, it is collected in the tar pit 23. As a result, the relationship between the abundance ratio of the first mist M1 and the second mist M2 contained in the combustion gas and the mass of the first mist M1 and the second mist M2 is shown in FIG.
On the other hand, the combustion gas that has moved toward the center of the particle recovery main body 41 flows into the exhaust duct 44 from the gas inlet 45 of the exhaust duct 44, passes through the gas outlet 46, and is discharged into the fourth pipe 5. The combustion gas discharged into the fourth pipe 5 flows into the first pipe 2 and is discharged toward the downstream equipment (not shown) as shown by the bold arrows in FIG.

As described above, the particle recovery device 1 according to the first embodiment collides with and mixes the combustion gas (gas) with the water W stored inside by the first particle recovery mechanism 10, so that the coarse particles D1 and the intermediate particles 1 and the intermediate particles 1 are mixed. Particle D2 is separated from the combustion gas and recovered. Further, the first particle recovery mechanism 10 aggregates the fine particles D3 into the first mist M1 having the same mass as the intermediate particles D2 by the first mist M1 generated when the combustion gas collides with the water W. Further, the particle recovery device 1 sprays the second mist M2 onto some of the fine particles D3 that are not aggregated by the first mist M1 by the first particle recovery mechanism 10, and the fine particles D3 have a second mass equivalent to that of the intermediate particles D2. It is provided with a particle agglomeration mechanism 30 that agglomerates into mist M2. Further, the particle recovery device 1 separates and recovers the first mist M1 in which the fine particles D3 are aggregated by the first particle recovery mechanism 10 and the second mist M2 in which the fine particles D3 are aggregated by the particle aggregation mechanism 30 from the combustion gas. A second particle recovery mechanism 40 is provided.

Further, in the particle recovery method according to the first embodiment, in the first recovery step, the combustion gas (gas) is coarsely mixed with the water W stored inside the first particle recovery mechanism 10. Particle D1 and intermediate particles D2 are separated from the combustion gas and recovered. Further, in the first recovery step, the fine particles D3 are aggregated into the first mist M1 having the same mass as the intermediate particles D2 by the first mist M1 generated when the combustion gas collides with the water W. Then, in the particle agglutination step, the second mist M2 is sprayed on some of the fine particles D3 that are not agglutinated by the first mist M1 by the first recovery step, and the fine particles D3 are made into a second mist M2 having the same mass as the intermediate particles D2. Aggregate. Further, in the second recovery step, the first mist M1 in which the fine particles D3 are aggregated in the first recovery step and the second mist M2 in which the fine particles D3 are aggregated in the particle aggregation step are separated from the combustion gas and recovered.

As a result, a group of particles composed of fine particles D3 contained in the combustion gas, intermediate particles D2 having a mass larger than the fine particles D3, and coarse particles D1 having a mass larger than the intermediate particles D3, which is contained in the combustion gas by a simple method without using a filter. Can be separated from the combustion gas and recovered. Therefore, maintenance such as backwashing of the filter and replacement of the filter becomes unnecessary.
The fine particles D3 cannot be separated from the combustion gas only by the first recovery step using the first particle recovery mechanism 10, which is a so-called wet scrubber. On the other hand, since the fine particles D3 are not mist, they cannot be separated from the combustion gas by the second particle recovery mechanism 40, which is a so-called mist scraper.

Therefore, in the first recovery step using the first particle recovery mechanism 10, the first mist M1 generated when the combustion gas collides with the water W causes the fine particles D3 to have the same mass as the intermediate particles D2. Aggregates into mist M1. Then, in the particle agglutination step using the particle agglutination mechanism 30, the second mist M2 is sprayed on some of the fine particles D3 that are not agglutinated by the first mist M1 by the first recovery step, and the fine particles D3 are equivalent to the intermediate particles D2. It aggregates in the mass of the second mist M2. Further, in the second recovery step using the second particle recovery mechanism 40, the first mist M1 and the second mist M2 are separated from the combustion gas and recovered. As a result, the fine particles D3 can be separated from the combustion gas. Generally, in order to separate the fine particles D3 from the gas, a technique using a filter is adopted, and maintenance such as back cleaning of the filter and replacement of the filter is required.

Further, since the pressure loss in the first particle recovery mechanism 10 is about 130 mmAq, the pressure loss in the particle aggregation mechanism 30 is about 1 mmAq, and the pressure loss in the second particle recovery mechanism 40 is about 10 mmAq, the pressure loss is low. There is an advantage that 1 is easy to install.
The flow rate of the combustion gases, the frequency up to about 1000 Nm ³ / hr to about 5000 Nm ³ / hr of about fluctuates normal distribution. In the first recovery step, it is preferable to select the first particle collection mechanism 10 which can exhibit a high particle recovery rate higher flow rate range of the flow rate frequency (approximately 2500 nM ³ / hr to about 3500 nm ³ / about hr). In the second recovery step, the entire flow range it is preferable to select (approximately 1000 Nm ³ / hr to about 5000 Nm ³ / hr or so) a second particle collection mechanism 40 which can exhibit a high particle recovery rate .. Thus, it is possible to recover the particles of the combustion gas the frequency rate of the combustion gas to about 1000 Nm ³ / hr to about 5000 Nm ³ / hr of about fluctuates normal distribution with a high dust collecting ratio.

(Second Embodiment)
Next, the particle recovery device and the particle recovery method according to the second embodiment of the present invention will be described with reference to FIG. FIG. 8 shows a schematic configuration of the particle recovery device according to the second embodiment of the present invention. In FIG. 8, the same members as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof may be omitted.
The particle recovery device 1 shown in FIG. 8 has the same basic configuration as the particle recovery device 1 shown in FIG. 1, but a cooling device 60 is installed in the second pipe 3 on the upstream side of the first particle recovery mechanism 10. Is different.

This cooling device 60 cools the combustion gas (gas) at the second pipe 3 and condenses it into water before the recovery of the coarse particles D1 and the intermediate particles D2 by the first particle recovery mechanism 10. Then, the cooling device 60 aggregates a part of the fine particles D3 into a mist having the same mass as the intermediate particles D2 by the mist generated at that time.
Then, in the first recovery step by the first particle recovery mechanism 10, the mist in which some of the coarse particles D1, the intermediate particles D2, and the fine particles D3 are aggregated is separated from the combustion gas and recovered. As a result, the particle recovery rate in the first recovery step can be increased as compared with the particle recovery device and the particle recovery method according to the first embodiment.

The rest of the fine particles D3 contained in the combustion gas is equivalent to the intermediate particles D2 by the first mist M1 generated when the combustion gas collides with water W in the first recovery step by the first particle recovery mechanism 10. It is aggregated in the first mist M1 having the mass of.
Further, in the particle agglutination step by the particle agglutination mechanism 30, the second mist M2 is sprayed from a plurality of mist nozzles 31 onto some of the fine particles D3 that are not aggregated by the first mist M1 discharged into the third pipe 4. The fine particles D3 are aggregated into a second mist M2 having the same mass as the intermediate particles D2.

Then, in the second recovery step by the second particle recovery mechanism 40, the first mist M1 that aggregates the rest of the fine particles D3 by the first recovery step and the second mist M2 that aggregates the fine particles D3 by the particle aggregation step are It is separated from the combustion gas and recovered.
Therefore, also in the particle recovery device 1 and the particle recovery method according to the second embodiment, the fine particles D3 contained in the combustion gas and the intermediate particles having a larger mass than the fine particles D3 can be obtained by a simple method without using a filter. A group of particles composed of coarse particles D1 having a mass larger than that of D2 and intermediate particles D2 can be separated from the combustion gas and recovered. Therefore, maintenance such as backwashing of the filter and replacement of the filter becomes unnecessary.

Although the embodiments of the present invention have been described above, the present invention is not limited to this, and various modifications and improvements can be made.
For example, the particle recovery device and the particle recovery method according to the present invention are not limited to the case where the particle group contained in the combustion gas is separated from the combustion gas and recovered, and the particle group contained in a gas other than the combustion gas. May be separated from the gas and recovered.

1 Particle recovery device 2 1st pipe 3 2nd pipe 4 3rd pipe 5 4th pipe 6 Bypass valve 10 1st particle recovery mechanism 11 Particle recovery body 11a Gas inlet 11b Gas outlet 12 1st guide plate 13 Gas guide 14 Throat part 15 Second guide plate 16 Scrubbing part 17 Drain plate 18 Overflow part 19 Seal pot 20 Drainage port 21 Drainage discharge pipe 22 Water intake port 23 Tarpit 30 Particle aggregation mechanism 31 Mist nozzle 40 Second particle recovery mechanism 41 Particles Main body for recovery 42 Gas inlet pipe 43 Centrifugal force application part 44 Exhaust duct 45 Gas inlet 46 Gas outlet 47 Drain valve 48 Connecting pipe 49 Seal pot 50 Drainage discharge pipe 60 Cooling device D1 Coarse particles D2 Intermediate particles D3 Fine particles M1 First mist M2 2nd mist W water

Claims (4)

A particle recovery device for separating and recovering a group of fine particles contained in a gas, intermediate particles having a mass larger than the fine particles, and coarse particles having a mass larger than the intermediate particles from the gas.
By colliding and mixing the gas with water stored inside, the coarse particles and the intermediate particles are separated from the gas and recovered, and the first mist generated when the gas collides with the water is generated. A first particle recovery mechanism that aggregates the fine particles into a first mist having a mass equivalent to that of the intermediate particles.
The second mist is sprayed on some of the fine particles that are installed on the downstream side of the first particle recovery mechanism and are not aggregated by the first particle recovery mechanism to make the fine particles equivalent to the intermediate particles. Particle aggregation mechanism that aggregates in the second mist of the mass of
The first mist which is installed on the downstream side of the particle aggregation mechanism and aggregates the fine particles by the first particle recovery mechanism, the second mist which aggregates the fine particles by the particle aggregation mechanism, and the first particle recovery. Centrifugal force is applied to the gas from which coarse particles and intermediate particles have been removed by a mechanism by a centrifugal force applying portion, and the first mist and the second mist and the gas are centrifuged by their mass differences to obtain the above. It is provided with a first mist and a second particle recovery mechanism for recovering the second mist.
In the second particle recovery mechanism, the gas from which coarse particles and intermediate particles have been removed by the first particle recovery mechanism, and the first mist and the particles in which the fine particles are aggregated by the first particle recovery mechanism. The second mist, in which the fine particles are aggregated by the agglomeration mechanism, is allowed to flow downward from the gas inlet pipe of the particle recovery main body of the second particle recovery mechanism into the particle recovery main body, and the gas and the first mist are introduced. The first mist and the first mist having the same mass as the intermediate particles are moved downward while swirling in the vicinity of the wall portion of the particle recovery body by applying a centrifugal force to the second mist by a centrifugal force applying portion. A particle recovery device characterized in that the second mist is moved outward by centrifugal force, and the gas having a small mass is moved toward the center to perform centrifugal separation. It is installed on the upstream side of the first particle recovery mechanism, and before the recovery of the coarse particles and the intermediate particles by the first particle recovery mechanism, the gas is cooled and condensed into water, and is generated at that time. The particle recovery device according to claim 1, further comprising a cooling device that agglomerates a part of the fine particles into a mist having a mass equivalent to that of the intermediate particles. A particle recovery method for separating and recovering a group of particles composed of fine particles contained in a gas, intermediate particles having a mass larger than the fine particles, and coarse particles having a mass larger than the intermediate particles from the gas.
By colliding and mixing the gas with water stored inside the first particle recovery mechanism, the coarse particles and the intermediate particles were separated from the gas and recovered, and the gas was made to collide with the water. A first recovery step of aggregating the fine particles into a first mist having a mass equivalent to that of the intermediate particles by the first mist generated at the time.
A particle agglomeration step of spraying a second mist onto some of the fine particles that are not agglomerated by the first mist by the first recovery step and aggregating the fine particles into a second mist having a mass equivalent to that of the intermediate particles.
The first mist in which the fine particles are aggregated by the first recovery step, the second mist in which the fine particles are aggregated by the particle aggregation step, and the gas from which coarse particles and intermediate particles have been removed in the first recovery step. Centrifugal force is applied to the particles by the centrifugal force applying portion, and the first mist, the second mist, and the gas are centrifuged by their mass differences, and the first mist and the second mist are separated into the second particles. and a second recovery step of recovery by the recovery mechanism seen including,
In the second recovery step, the gas from which coarse particles and intermediate particles have been removed in the first recovery step, the first mist in which the fine particles are aggregated in the first recovery step, and the particle aggregation step are used. The second mist in which the fine particles are aggregated is allowed to flow downward from the gas inlet pipe of the particle recovery main body of the second particle recovery mechanism into the particle recovery main body, and the gas, the first mist and the first mist are introduced. Centrifugal force is applied to the 2 mist by the centrifugal force applying portion, and the particles are moved downward while swirling near the wall portion of the main body for collecting particles, so that the first mist and the second mist having the same mass as the intermediate particles are used. A particle recovery method, which comprises moving the particles outward by centrifugal force and moving the gas having a small mass toward the center to perform centrifugal separation. Prior to the recovery of the coarse particles and the intermediate particles by the first recovery step, the gas is cooled and condensed into water, and a part of the fine particles is equivalent to the intermediate particles by the mist generated at that time. The particle recovery method according to claim 3, wherein the particles aggregate in a mass mist.

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