Gas separation – With recycle means – For concentrate entrained in effluent gas outlet means
Patent
1989-06-26
1991-04-23
Spitzer, Robert
Gas separation
With recycle means
For concentrate entrained in effluent gas outlet means
55344, 55347, 55348, 55349, 55447, B01D 4512
Patent
active
050096842
DESCRIPTION:
BRIEF SUMMARY
Background of the Invention
This invention relates to a purification unit for separating solid particles from gases, for example: flue gases, air mixed with dust and, air-blast such a unit includes one or more groups, each having a plurality of mutually parallel flow cylinders arranged in a common chamber, each cylinder being connected at its inlet end to a fixed rotary head for setting incoming gas in rotary motion in the respective flow cylinder and, an outlet diffusor projecting concentrically into the outlet end of each such cylinder. In use, purified gas streams out through the outlet diffusor. The outlet diffusor forms, with its inlet portion enclosed by the flow cylinder, and annular gap together with the surrounding cylinder. In use, separated solid particles stream out through the annular gap to the closed chamber serving for dust collection.
Dust separators comprising one single flow cylinder with associated rotation generator connected to the inlet end of the cylinder and having an outlet diffusor projecting concentrically into the outlet end of the flow cylinder have been previously known. This type of dust separator has appeared to operate very satisfactorily, as far as flue gases and other gases containing particles of a small mass are concerned, and purifies such gases up to about 99.7%. This is quite acceptable in most connections that may be concerned with the present type of dust separator. However, a disadvantage of this known dust separator is a very low capacity, i.e. below 600 m.sup.3 gas per hour, and therefore it has not been used to any large extent, despite its high efficiency in purification.
In order to improve the capacity, several such dust separators have been connected in parallel by arranging the flow pipes of all of these dust separators in a common closed dust collecting chamber in which the gap of the dust separators between flow cylinder and outlet diffusor ends provides for discharge of separate particles in the collecting chamber. An example of such a dust separating unit is shown in Swedish laid-open publication No. 304 668. Thus, parallel connection of a plurality of dust separators to one unit has been tested in practice but no better purification degree than about 86%, i.e. a purification degree that is too low to be considered acceptable in most connections, has been obtained. Therefore, purification units containing several dust separators connected in parallel of this type have not been used in practice.
After establishing that purification units containing several dust separators connected in parallel of the type indicated above do not give the desired purification effect, attempts have been made to solve this problem, but without any appreciable success so far.
SUMMARY OF THE INVENTION
The foregoing problem is solved by the present invention, the result of which is a purification unit consisting of one of several dust separating units having an efficiency of the purification that corresponds to, and is even somewhat better than the efficiency obtained by means of one single dust separator of the relative type, and this is independent of which kind of impurified gas is to be purified. By means of the unit of the invention even air-blast can be purified for re-use of the blast agent.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in the following in greater detail with reference to the accompanying drawings, wherein:
In the drawings
FIG. 1 shows a section of a purification unit according to the invention.
FIGS. 2 and 3 are perspective views on a smaller scale of a module or group of nine and three, respectively, dust separating units connected in parallel,
FIG. 4 shows a modified design with a rotary head mounted before each dust separating unit,
FIG. 5 is a partial end view of a rotary head, and
FIG. 6 shows a section taken substantially along the line VI--VI in FIG. 5.
DETAILED DESCRIPTION
The purification unit of the invention for separation of dust and other solid particles from impurified gases inclusive of air comprises a plurality
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Derwent's abstract No. 55754 B/30 SU 626 809.
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