Wet-process stack gas purification method

Details Wet-process stack gas purification method Wet-process stack gas purification method

1988-03-25

1990-06-05

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Solid component

423242, B01D 4500, B01D 4600, B01D 5300, C01B 1700

Patent

active

049312634

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a method of and apparatus for purification of stack gas, and more specifically, a purification method and apparatus which are particularly useful in cases where an extremely high effect of decontamination should be attained as in for example decontamination of stack gas from a radioactive waste incinerator.


BACKGROUND ART

Herein the present invention will be described, taking an instance in the cases of radioactive waste.
Conventionally known methods of the treatment and disposal of stack gas from radioactive waste incinerators are dry-processes utilizing a ceramic filter for example and wet-processes utilizing a venturi scrubber for example.
In order to attain a high decontamination factor according to such known methods, usually it is adopted to repeatedly effect a decontamination treatment. As a result of this, it is required to provide installation of a large scale and accordingly a building of a large scale, whereby the installation cost has been expensive in the prior art.
With the dry-processes, further, although they can take effect in capturing solids, they can take almost no effect in removing gaseous harmful substances and volatile matters, for example iodine.
The present invention centers, in its objects, upon providing a method and apparatus by which radioactive solids, gaseous harmful substances and volatiles can be removed at the same time and yet a great extent of scale-down of the installation can be realized while, in the light of the decontamination factor, an effect which is comparable to ones in the cases of 3- or more-stage wash-treatment methods in the prior art can be attained.


DISCLOSURE OF THE INVENTION

The wet-process stack gas purification method for attaining the above object according to the present invention is of the type by which dust and other contaminants contained in stack gas are removed by contacting the stack gas with a scrubbing liquid comprising the steps of scrubbing the stack gas by bubbling the gas out of a stack gas introduction pipe into a first scrubbing liquid while keeping constant the level of the scrubbing liquid; further purifying the above scrubbed gas by subjecting it to counter-current contact with a second scrubbing liquid in a scrubbing tower; recycling the used first scrubbing liquid into the stack gas introduction pipe to cool stack gas being sent thereinto; and recycling the used second scrubbing liquid into the scrubbing tower.
Then, the wet-process stack gas purification apparatus according to the present invention is of the type in which dust and other contaminants contained in stack gas are removed by contacting the stack gas with a scrubbing liquid comprising a first scrubbing tank provided with means for maintaining constant the level of a first scrubbing liquid, a stack gas introduction pipe extending into the first scrubbing liquid from above the level of the first scrubbing liquid and having an opening provided with a gas dispersing means, and a scrubbing tower in which the stack gas scrubbed with the first scrubbing liquid is subjected to counter-current contact and further purified with a second scrubbing liquid, wherein means is provided for recycling the first scrubbing liquid in the first scrubbing tank into the stack gas introduction pipe and ejecting the recycled scrubbing liquid into the stack gas being introduced into the introduction pipe and means is also provided for recycling into the scrubbing tower the second scrubbing liquid contacted with the stack gas scrubbed with the first scrubbing liquid.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view, showing an embodiment of the wet-process stack gas purification apparatus according to the present invention;
FIG. 2 is a schematic view, showing another embodiment of the wet-process stack gas purification apparatus according to the invention;
FIG. 3 is a schematic view, showing still another embodiment of the wet-process stack gas purification apparatus according to the invention; and
FIG. 4 shows a flow chart o

REFERENCES:
patent: 3904742 (1975-09-01), Akimoto
patent: 3948608 (1976-04-01), Weir
patent: 3985860 (1976-10-01), Mandelik et al.
patent: 4156712 (1979-05-01), Kanai et al.
patent: 4312646 (1982-01-01), Fattinger
patent: 4618482 (1986-10-01), Shinoda et al.

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