JPS6325810B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption tower, and more particularly to an absorption tower suitable for use in a wet flue gas desulfurization device that uses slurry such as lime as an absorption liquid.

The absorption tower used in wet desulfurization equipment has traditionally been
As shown in the figure, a spray means 2 is provided in the tower, and a gas introduction duct 3 is provided on the side wall of the tower located below the location where the spray means 2 is installed. In such an absorption tower, limestone and a slurry containing lime as an absorbent are sprayed from the spray means 2 and come into contact with SO ₂ gas contained in the exhaust gas introduced from the duct 3. The problem in this case is that near the gas inlet of the absorption tower, the absorbent slurry is dried up by the introduced gas, and the pH of the absorbent slurry decreases due to the SO ₂ gas in the gas, causing scale. It is something that happens. This scale particularly tends to flow down inside the tower and adhere to the vicinity of the connection between the duct 3 and the absorption tower. This increases ventilation loss within the duct, making stable gas absorption operations difficult.

The present invention eliminates the drawbacks of the prior art described above,
By preventing scaling near the connection between the duct that introduces gas into the absorption tower and the side wall of the absorption tower,
An object of the present invention is to provide an absorption tower capable of performing stable gas absorption operations.

In short, the shape of the vicinity of the connection between the duct and the tower side wall has been improved so that the connection between the bottom of the duct and the absorption tower side wall is separated from the drop point of the slurry flowing down inside the tower.

Hereinafter, the present invention will be explained in more detail with reference to embodiments shown in the accompanying drawings.

The absorption tower shown in FIG. 2 includes a spraying means 2 in the absorption tower main body 1, and a gas introduction duct 3 on the side wall of the tower located below the installation point of the spraying means.
is provided. The connection part a between the top surface of the duct and the tower side wall and the connection part b between the bottom surface of the duct and the tower side wall are such that the connection part b is located further from the central axis of the absorption tower main body 1 than the connection part a. We have a relationship where we do things like that. Tower side wall portion 4 extending downward from the connecting portion b
has a shape that is almost symmetrical to the other tower side wall 5 which is not provided with a duct, and is connected to the discharge pipe 6.

In the absorption tower shown in FIG. 3, the connection part a and the connection part b are in the same positional relationship as in the absorption tower shown in FIG.
The shape of the tower side wall portion 7 extending downward from the connecting portion b is different from that of the absorption tower shown in FIG. The column side wall section 7 is inclined downward from the connecting section b toward the central axis of the absorption column main body 1, and the column side wall section 8 following this column side wall section 7 reduces the degree of inclination and extends downward to connect with the discharge section 6. There is.

As the above-mentioned spray means, generally a pipe provided with a large number of spray nozzles is used. The spray nozzle may be oriented upward or downward. Furthermore, the positional relationship between the connecting portion a and the connecting portion b described above is relative, and does not need to be strictly related by a fixed value. It can be selected as appropriate depending on the structural conditions or the gas absorption operation conditions, such as the diameter of No. 3. Furthermore, the shape of the tower side wall extending downward from the connecting part b allows the slurry flowing into the tower to flow smoothly into the discharge pipe 6.
There are no particular restrictions as long as it is designed so that it can be easily reached. Therefore, the cross-sectional shape of the tower side wall portion extending downward from the connecting portion b may be curved.

In the absorption tower having the above configuration,
The exhaust gas containing SO ₂ is transferred from the duct 3 to the absorption tower main body 1.
The absorbent slurry is introduced into the column, rises inside the column, and reacts in contact with the absorbent slurry supplied from the spray means 2. As a result of this contact reaction, the absorbent slurry contains calcium sulfite or gypsum dihydrate as a reaction product and flows down the column. However, since the connecting part b between the bottom of the duct 3 and the tower side wall is located closer to the duct than the falling point of the slurry flowing down, the slurry flowing down does not adhere to the bottom of the duct 3 and can be removed from the absorption tower 1. It falls onto the side wall of the tower forming the lower part.

Although the present invention has been described above regarding an absorption tower used in a wet flue gas desulfurization apparatus, the present invention can be similarly applied to other absorption towers in which similar scale is a problem.

According to the present invention, near the gas inlet to the absorption tower,
In particular, since scaling of the bottom portion of the duct connected to the tower side wall can be prevented, stable gas absorption operation can be performed without reducing the ventilation loss of the gas introduction duct.

[Brief explanation of the drawing]

Fig. 1 is a schematic structural diagram showing the structure of a conventional absorption tower, Fig. 2 is a schematic structural diagram showing one embodiment of the present invention, and Fig. 3 is a schematic structural diagram showing another embodiment of the present invention. It is a diagram. 1... Absorption tower main body, 2... Spray means, 3...
Duct, a... Connecting part (duct top part and tower side wall part), b... Connecting part (duct bottom part and tower side wall part).

Claims (1)

[Claims] 1. In an absorption tower having a spray means 2 in the tower and a gas introduction duct 3 provided on the tower side wall located below the installation location of the spray means 2, the connection between the bottom part of the duct 3 and the tower side wall An absorption tower characterized in that the duct 3 is provided on the absorption tower side wall 4 such that the part b is located further from the central axis of the absorption tower main body 1 than the connecting part a between the upper surface part of the duct 3 and the tower side wall. .