JPS584575Y2 - Harmful gas absorption treatment equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an absorption treatment device for removing harmful gases from waste gas.

Conventional absorption treatment methods for removing harmful gases include so-called dry methods and wet methods, each of which has its own advantages and disadvantages, and the reality is that it is generally difficult to determine their superiority or inferiority.

For example, the dry method has poor absorption capacity as seen in adsorption methods, etc.
In addition, although the direct reaction method has the disadvantage that the absorption rate is slow, the absorption capacity is reduced due to surface dirt, and the absorption efficiency is inferior to that of the wet method, it also has the advantage that the reaction product can be recovered as a dry powder.

On the other hand, the wet method has the advantage of achieving high absorption efficiency;
The disadvantage is that wastewater treatment requires a large amount of cost.

Therefore, the dry method and the wet method are each advantageous in their respective fields of application and are used in combination, and using them alone does not fully utilize the advantages of each.

The purpose of this device is to provide a new harmful gas absorption treatment device that effectively utilizes the advantages of both dry and wet methods. A harmful gas absorption and treatment device consisting of a wet absorption section filled with a filler, and a dry recovery section filled with a packed bed that is partitioned and separated from the wet absorption section and exists below it and moves from above to below. There, the drying recovery section is
a conveying means for conveying the packed bed located below upward; a tray for receiving the conveyed packed bed and immersing it in the absorption liquid; and transferring the packed bed in the tray to the packed bed of the drying recovery section A wet absorption section and a dry recovery section, also known as absorption post-processing, are installed in one device to improve the functions of each of them, resulting in high and stable harmful gas removal efficiency. Moreover, it has the excellent effect of recovering harmful gas components in powder form without requiring a separate water treatment device.

Further, details of one embodiment of the present invention will be explained with reference to the drawings.

1 shows an absorption treatment apparatus of the present invention, in which waste gas containing harmful gases introduced from a waste gas containing rod 2 passes through a perforated plate 3, and is filled with a fixed packing 4 having a similar shape. The harmful gas enters the wet absorption section 5, where it comes into gas-liquid contact with the absorption liquid supplied from the absorption liquid supply port 12 and sprayed.
Harmful ingredients are absorbed.

The clean gas from which harmful components have been absorbed and removed is further sent through a duct 6 to a drying and recovery section consisting of a vertical moving bed 8 filled with a packed bed 7, where it is transferred to a packed bed that circulates through the device as a secondary treatment. The remaining harmful components are absorbed and completely cleaned by contact with the absorbing liquid through T as a medium, and are released into the atmosphere from a chimney (not shown) through the gas outlet duct 10.

Note that when the temperature of the gas discharged from the wet absorption section is low, heating gas is fed from outside the apparatus by the fan 9 as necessary to maintain the high temperature of the dry recovery section.

The absorbent liquid used in the wet absorption section passes through the perforated plate 3, the absorption liquid flow port 13, and the liquid sealing section 14, and is collected in the tray 15, and is transferred to the dry recovery section provided below the wet absorption section as described above. It is reused as an absorption liquid for secondary treatment.

A packed bed 7 transported by a vertical screw conveyor 16 driven and rotated by a drive device such as a motor falls into the tray 15, and the packed bed is fully immersed in the absorption liquid in the tray and its surface is coated. A scraper 1 attached to a screw conveyor shaft forming a liquid film of absorption liquid
7 and falls into the packed bed again.

In this way, the packed bed circulates within the drying recovery section and flows counter to the rising to-be-treated gas, and during this time harmful components in the gas come into contact with the absorption liquid film formed on the surface of the filled spheres and are absorbed onto the surface of the filled spheres. As the packed bed descends, the formed reaction product is evaporated to dryness by the high-temperature gas sent through the duct 19, peeled off and separated from the packed bed by the perforated plate 18, and collected in powder form outside the apparatus. Ru.

This device is equipped with a dust collector such as a cyclone 20 afterward to collect dust, and the gas exiting the cyclone is released into the atmosphere through a chimney.

Since the device of the present invention has the above-described structure, the advantages of the wet method and the indigo method are utilized, and it has superior features compared to conventional methods in which each method is used alone.

[Brief explanation of the drawing]

The figure is a longitudinal cross-sectional view of the harmful gas absorption and treatment device according to the present invention. Incidentally, the symbols of the main parts in the figure are as follows. 1... Absorption treatment device, 2... Waste gas containing rod duct, 3... Perforated plate, 4... Fixed filling, 5...・Wet absorption section・6...Duct, 7...Filled bed, 8...Vertical moving bed, 9...Fan, 10... ...Gas outlet duct, 11...Fan, 12...
Absorption liquid supply port, 13... Absorption liquid flow port, 14.
...Liquid sealing section, 15...Tray, 16...
... Vertical screw conveyor, 11 ... Scraper, 18 ... Perforated plate, 19 ...
Duct, 20...Cyclone.

Claims (1)

[Scope of utility model registration request] a wet absorption section filled with a fixed filler that brings the absorption liquid into gas-liquid contact with harmful gases in the waste gas; and a partition from the wet absorption section;
A harmful gas absorption and treatment device comprising a dry recovery section filled with a packed bed that is separated and exists below and moves from above to below, wherein the dry recovery section moves the packed bed that is below it upward. a tray for receiving the transported packed bed and immersing it in an absorption liquid;
The harmful gas absorption and treatment apparatus further comprises means for returning the packed bed in the tray to the packed bed in the drying and recovery section.