Agitating – By injecting gas into mixing chamber – With stirrer
Reexamination Certificate
1999-09-17
2001-04-10
Cooley, Charles E. (Department: 1723)
Agitating
By injecting gas into mixing chamber
With stirrer
C366S172100, C366S194000, C366S301000, C366S315000
Reexamination Certificate
active
06213629
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention concerns a device for mixing particulate material and liquid, and particularly for mixing water and absorbent material which is reactive with gaseous pollutants in flue gases and which, during cleaning of the flue gases, is to be introduced into these gases in a moistened state in order to convert the gaseous pollutants into separable dust, said device comprising an elongate container having two lengthwise side walls and being arranged essentially horizontally in its lengthwise extension, an inlet for the introduction of particulate material into the container, a liquid spraying means for spraying liquid over the particulate material in the container, an agitator in said container, said agitator consisting of at least one rotary shaft which extends in the longitudinal direction of the container and on which are mounted, at an angle, a plurality of axially spaced-apart discs through the centres of which the shaft extends, an outlet for discharging material mixed with liquid from the container, and a fluidizing means adapted to fluidize the particular material in the container during the mixing operation.
2. Description of Background Art
When gaseous pollutants, such as sulphur dioxide, are to be separated from flue gases, the gases are conducted through a contact reactor in which particulate absorbent material reactive with the gaseous pollutants is introduced in a moistened state into the flue gases in order to convert the gaseous pollutants to separable dust. The flue gases are then conducted through a dust separator, in which dust is separated from the flue gases and from which the thus-cleaned flue gases are drawn off. Part of the dust separated in the dust separator is conducted to a mixer, where it is mixed and moistened with water, whereupon it is recycled as absorbent material by being introduced into the flue gases along with an addition of fresh absorbent. Slaked lime (calcium hydroxide) is generally used as the fresh absorbent.
One prior-art device of the kind defined in the introduction is shown in WO 96/16727. The container of the prior-art device has a rear end in which the inlet is located, and a front end in which the outlet is located. When the prior-art device is used as a mixing device in which the above-described mixing of absorbent material and water is performed, the front end of the container is inserted in a flue-gas channel through which the flue gases containing the gaseous pollutants are conducted. The outlet, which thus also is disposed in the flue-gas channel, is an overflow means formed by the lengthwise side walls in the part of the container inserted in the channel being lower than in the container part located outside the channel.
In the WO 96/16727, the prior-art device is disadvantageous because of the projection of the container into the flue-gas channel, which may cause disturbance of the gas flow therein and make it difficult to obtain an even distribution of moistened material across the channel cross-section, particularly in the case of large cross-sectional areas.
SUMMARY AND OBJECTS OF THE INVENTION
The object of the present invention thus is to provide a device which is particularly adapted for use in mixing absorbent material and water in the above-described flue-gas cleaning operation, and in which the above disadvantages are eliminated, or at least considerably reduced.
This object is obtained in accordance with the invention by means of a device of the kind defined in the introduction and which includes an inlet that is located at one lengthwise side wall of the container and extends along said wall, and that the outlet which is an essentially horizontal overflow means, is located in the other lengthwise side wall of the container and extends along said other wall.
In certain applications, it is advantageous to arrange the container at such an angle to its longitudinal axis that it slopes downwardly, towards the outlet,
In accordance with one preferred embodiment, a plurality of obliquely downwardly extending distribution plates formed with two side edges that converge downwardly in the direction of inclination, are disposed at the outlet in order to receive material mixed with liquid on their upper faces.
Preferably, the container has an upper bottom and a lower bottom, said upper and lower bottoms defining between them a chamber and the upper one of said bottoms being air-permeable, an air-supply means being arranged to supply air to the chamber for the purpose of fluidizing the particulate material in the container.
Preferably, the discs have an elliptic shape and are so inclined about their minor axes relative to the shafts as to have a circular axial projection.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
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ABB Flakt AB
Birch & Stewart Kolasch & Birch, LLP
Cooley Charles E.
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