JPH06170142A - Scrubber type dust removing equipment - Google Patents

Abstract

PURPOSE:To provide scrubber type dust removing equipment by which dust- containing gas is sufficiently brought into contact with scavenging liquid. CONSTITUTION:Dust-containing gas is blown into scavenging liquid of the lower part in a dust collection vessel 1. Dust contained in gas is caught by the scavenging liquid and also the gas after gas-'liquid contact is discharged from a discharge port 6 of the upper part of the dust collection vessel. In the scrubber type dust removing equipment, water screen forming members 8 are provided between the scavenging liquid in the dust collection vessel 1 and the discharge port 6. Water screens are formed by the members 8 and water of the water screens is allowed to fall down to the scavenging liquid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scrubber type dust remover for removing dust-containing gas such as coal gasification gas containing dust.

[0002]

2. Description of the Related Art There is a scrubber type dust removing device using a collecting liquid such as water as a device for dedusting dust-containing gas (for example, coal gasification gas containing dust).

As shown in FIG. 3, this scrubber type dust remover stores a collected liquid in a lower part of a dust container 20, and blows dust-containing gas into the collected liquid to collect the gas and the collected liquid. Are brought into gas-liquid contact with each other, whereby dust in the gas is trapped by the trapping liquid to become, for example, a gas having a concentration of about 1.5 mg / Nm ³ or less. The dedusted gas rises in the container 20 and collides with the coalescer 21 to remove mist in the gas, and then flows into the gas line 7 through the discharge port 6.

[0004]

By the way, in the above-mentioned scrubber type dust remover, the collected liquid, for example, water and gas are brought into gas-liquid contact to capture the dust in the gas in the water. It is particularly effective for coal ash) and has a good collection efficiency. However, since dust-containing gas is blown into water to bring it into gas-liquid contact, dust-containing bubbles rise in the water, so that gas-liquid contact may not always be sufficient.

Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a scrubber type dust removing device capable of sufficiently bringing the dust-containing gas into contact with the collected liquid. is there.

[0006]

In order to achieve the above-mentioned object, the present invention blows dust-containing gas into a lower collecting liquid in a dust container so that the dust in the gas is captured by the collecting liquid. In addition, in a scrubber type dust remover that discharges gas after gas-liquid contact from the discharge port above it, a water film is formed between the collected liquid and the discharge port of the dust collecting container and the water of the water film is formed. It is provided with a water film forming member for dropping water into the collected liquid.

[0007]

By providing the water film forming member between the collected liquid and the discharge port of the dust container, a water film is formed there, so that the gas from the collected liquid passes through the water film. At the same time, the gas forms a water film and comes into contact with water that falls into the collection liquid. Therefore,
Even if the gas rises from the collection liquid, the gas further contacts the falling water and the water film, so that the gas comes into sufficient gas-liquid contact, and the collection efficiency can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a vertical, cylindrical dust collecting container, and water (collecting liquid) for trapping dust in gas is supplied below the dust collecting container 1. Water line 2
Are connected, and water is continuously or intermittently supplied from the water line 2 to collect water in the lower part of the container 1.

Below the dust collecting container 1, a gas introducing line 3 for a coal gasification gas containing dust-containing gas, for example, dust, is connected, and the tip of this gas introducing line 3 is introduced into the stored water in the container 1 to form a gas. Are arranged so as to be blown toward the lower part, and the gas blown from this line 3 and the stored water come into gas-liquid contact with each other so that dust in the gas is captured by the water. A discharge line 4 for discharging water and dust is connected to the bottom of the dust container 1, and an eliminator 5 for removing mist in the gas is provided above the container 1.
Further, a gas outlet 6 is provided at the top of the dust container 1, and a gas line 7 is connected to the outlet 6.

Further, in the dust collecting container 1, between the stored water and the eliminator 5, meshes 8 which are water film forming members are provided in three stages at predetermined intervals. These meshes 8
The water film (water film) is formed on the mesh 8, and the pitch is formed so that the water forming the water film falls downward from the mesh 8. For example, the pitch of these meshes 8 is the largest at the lower stage and becomes smaller as it goes to the upper stage.
S standard sieve (pitch: 88 to 105 μm), JIS standard sieve (pitch: 74 to 88 μm) in the middle stage, and JIS standard sieve (pitch: 37 to 74 μm) in the lower stage. If the pitch of the mesh is too small, the pressure loss will increase. Therefore, the mesh should be selected within an allowable pressure loss range.

Further, above the meshes 8, spray nozzles 9 for forming a water film by uniformly spraying water on the meshes 8 are provided. A water supply line 10 for continuously or intermittently supplying water is connected to these spray nozzles 9, and water from the water supply line 10 is always used to form a water film on the mesh 8. This water film and gas rising in the container 1 come into gas-liquid contact. The number of stages of the mesh may be three or less, and is arbitrarily determined depending on the contact state between the gas from the stored water and the water sprayed from the spray nozzle.

Next, the operation of this embodiment will be described.

Water is supplied from the water line 2 into the dust collecting container 1 and accumulated in the lower part thereof, and at the same time, water is sprayed from the spray nozzle 9 through the water supply line 10 to form a water film on each mesh 8. It Further, dust-containing gas such as dust-containing coal gasification gas at about 140 to 160 ° C. and about 25 to 30 kg / cm ² is blown into the stored water in the container 1 from the gas introduction line 3 to generate dust-containing bubbles in the water. To rise. As a result, the gas and the water come into gas-liquid contact, and the dust in the gas is captured by the water. The water that has captured the dust is discharged from the discharge line 4 together with the dust and is processed in another system.

The gas in gas-liquid contact with the stored water rises in the container 1 and passes through the mesh 8 and the water film on the mesh 8 to remove the mist in the gas through the eliminator 5 and then the discharge port 6 Flows into the gas line 7 and reaches a desulfurization device, a gas turbine, or the like.

As described above, the gas that has come into gas-liquid contact with the stored water further comes into contact with the water film before reaching the discharge port 6, the water that drops after forming the water film, and the water sprayed from the supre nozzle 9 onto the mesh 8. Therefore, the gas comes into sufficient gas-liquid contact with water, and the dust that has risen from the stored water together with the gas also comes into contact with, for example, the water film and is captured by the water as shown in FIG.
Then, it drops from the water film into the stored water together with the water droplet 11. At this time, when the dust 12 is trapped in the water, the dust 12 forms the core of the water droplet 11, so once the dust 12 is trapped in the water, re-scattering from the water droplet 11 does not occur.

Further, since the water film forming member for forming the water film is formed of the mesh 8, it is possible to remove fine dust, for example, dust of 1 μm or less. That is, dust having a particle size larger than the pitch of the mesh 8 is surely removed by mesh, and the gas passes through the mesh 8 and then through the water film. Therefore, the contact ratio between the water film and the dust in the gas is high. Therefore, dust of 1 μm or less can be removed, and coal ash, alumina, calcium oxide, aluminum oxide, etc. contained in the gas can be efficiently collected. For example, if the three-stage mesh described above is used, dust with a particle size of about 2 μm or more will be almost 1
It is possible to remove 00%, and it is possible to remove about 70 to 90% of dust of 1 μm or less, which can be removed by only about 50% conventionally.

Therefore, by providing the mesh 8 in the dust container 1 and forming a water film on the mesh 8, even fine dust can be removed, and the collection efficiency is improved. For this reason, attempts have been made in recent years to increase the conversion rate of coal to gas.In this case, in order to increase the conversion rate of coal to gas by reducing the particle size of coal to be fed into the gasification furnace, Since the dust contained in the vaporized gas also becomes finer, the dust removing device according to the present invention is particularly effective as a device for dedusting this gas.

[0019]

In summary, according to the present invention, the water film forming member for forming a water film between the collected liquid and the discharge port of the dust container and for dropping the water of the water film into the collected liquid. Since we set up
The dust-containing gas can be sufficiently brought into gas-liquid contact, and the excellent effect that the collection efficiency can be improved is exhibited.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of a scrubber type dust remover of the present invention.

FIG. 2 is a perspective view showing a state in which A in FIG. 1 is enlarged.

FIG. 3 is a configuration diagram showing an example of a conventional scrubber type dust remover.

[Explanation of symbols]

 1 Dust container 6 Discharge port 8 Mesh (water film forming member)

Claims (1)

[Claims] 1. A dust-containing gas is blown into a lower collecting liquid in a dust collecting container so that dust in the gas is trapped in the collecting liquid and a gas after gas-liquid contact is discharged from a discharge port above it. In the scrubber type dust remover, a water film forming member is provided between the collected liquid and the discharge port of the dust collecting container to form a water film and to drop the water of the water film into the collected liquid. Scrubber type dust remover.