Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture
Patent
1993-07-07
1996-05-21
Woo, Jay H.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
55235, 55237, 552574, 95155, 95157, 95219, 95242, 96176, 96180, 422190, B01D 1902, B01D 1904
Patent
active
055187013
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process for purification of gases, in particular exhaust gases, and to apparatus for use in such a process.
A process of this type is used in the apparatus disclosed by DE 3920321. In this apparatus, sludge settles in the reaction chamber in a reaction medium receiver and is passed into a sludge receiver in which it is dried. The foam settling on the reaction medium is broken by a defoamer into liquid and purified gas. The liquid, which essentially comprises the reaction medium, is returned to the reaction chamber.
Although it is possible using this apparatus to achieve a substantial purification of the fed gases, the impurities contained therein are mixed with the sludge removed from the reaction chamber even after drying thereof.
The object of the invention is to create a process and a plant by means of which the substances removed from the gases to be purified can be separated.
SUMMARY OF THE INVENTION
According to the present invention, advantage is taken of the finding that the dense foam forming in the reaction chamber, which is deposited as a reaction medium mixture on the liquid surface in the sludge receiver, contains a considerable portion of the substances to be removed from the gases. This means that it is expedient to attempt to separate the substances contained in the sludge. For this purpose, gravity separation is carried out in a holding procedure. During this, the heavy constituents settle and can be fed to residue utilization. The light gas constituents are then subjected to layering. To this end, an additional reaction medium, inter alia, can be fed in. Both reaction media cause the individual substances to separate into layers and/or to settle. Subsequently, it is possible, depending on the specific gravity of the different substances, to conduct these away and to separate them and further process them.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described below in an illustrative manner with reference to FIGS. 1 to 3, in which:
FIG. 1 shows a diagrammatic representation of a plant for carrying out the process according to the invention,
FIG. 2 shows a vertical section of the defoamer of the plant of FIG. 1, and
FIG. 3 shows a plan view of the defoamer of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
An essential improvement in the efficiency can be achieved by introducing liquid reaction medium and/or dense foam by means of a spraying device into the gases to be purified which are fed to the reaction chamber. Especially when gases are fed at a temperature above 60.degree. C., a considerable improvement in the efficiency can be achieved here.
In the case of the abovementioned feeding of gases at elevated temperature, it is expedient to subject the sludge produced in the reaction chamber to a drying process. For this purpose, the sludge is fed to a multistage dryer into which the gases to be purified are introduced centrally and the sludge is distributed radially over the stages and transported downwards. It is also advantageous here to feed dense foam and accumulating liquid together with the reaction medium to the dryer reaction chamber via the dirty gas inlet.
In a process for the purification of gases, in particular flue gases, using a foam-forming reaction medium with which dirty gas is contacted in a reaction chamber, in which the foam is broken after the reaction between dirty gas and the reaction medium, the reaction medium recovered by the breaking and the settling sludge are separately collected and the purified gas is withdrawn, it is proposed according to the invention that, when dirty gas having a temperature of <60.degree. C. is purified, the defoaming is carried out in the reaction chamber, dense foam formed by the defoaming and reaction medium mixed with water and gases beneath the dense foam are collected, the dense foam and surface sludge are removed from the reaction chamber by suction and held for gravity separation, layering of the substances to be separated is carried out in a settling pha
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Smith Duane S.
Woo Jay H.
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