Heating – With means diluting – purifying or burning exhaust gases
Patent
1986-09-22
1988-03-29
Yuen, Henry C.
Heating
With means diluting, purifying or burning exhaust gases
110205, 110216, 422205, 422168, 159 42, 55DIG14, F23J 300, F23C 900
Patent
active
047340304
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for the treatment of flue gases, more particularly to an apparatus for dedusting industrial flue gases.
In a special embodiment the apparatus according to the present invention is especially suited for being used as a smoke filter in the combustion of, e.g., lignite (called also brown coal), wherein, first of all, dedusting of flue gases is provided and secondly also the major part of sulphur is removed from said gases.
A known apparatus for the treatment of flue gases which has the nearest resemblance to the apparatus according to the present invention is the classical cyclone separator or dust extractor. In such a cyclone separator the flue gases are substantially tangentially fed into an upright cylindrical vessel, wherein they first describe a helical path along the cylindrical wall and finally ascend again in the vessel and disappear through a central outlet.
By the helical motion of the flue gases the largest dust particles contained therein are pressed against the cylindrical wall by the centrifugal force, whereafter they fall down and are collected at the bottom of the vessel in a funnel-shaped space or in a filter.
The disadvantage of such a known cyclone separator is that only the heavier dust particles are thrown against the side wall of the vessel and then removed.
The lighter dust particles, however, are readily removed along with the flue gases through the outlet and hence get into the atmosphere, whereby a serious pollution of the environment may arise.
In order to do away with this disadvantage, the present invention provides an apparatus for the treatment of flue gases, whereby, on the one hand, large as well as small dust particles are removed from said flue gases and, on the other hand, said flue gases can be desulphurised, if necessary.
Actually, this desulphurisation takes place indirectly by the neutralisation of the acids formed with the sulphur. This results therein that the apparatus is not corroded by said acids and that no pollution of the environment by acids arises either.
The apparatus according to the present invention having the above-mentioned advantages mainly consists of the combination of a vessel provided with an inlet opening for the flue gases, an outlet opening for the flue gases, a cooled wall, means for cooling the latter, means for forcing the entering flue gases to come into contact with said cooled wall, and an outlet for discharging the residual product from the flue gases to be treated.
Further, the supply tube of the apparatus is provided with an inlet through which means can be introduced for neutralising the acids formed from sulphur.
In order to better show the features of the present invention, a preferred embodiment is described hereinafter as an example without limiting the scope thereof and with reference to the accompanying drawings wherein :
FIG. 1 represents a partial section of the apparatus according to the present invention;
FIG. 2 represents a section according to line II--II in FIG. 1.
As represented in the figures, the apparatus according to the present invention mainly consists of an upright cylindrical vessel 1 which at its bottom preferably tapers off to a funnel-shaped end 2.
At the flat top side 3 of vessel 1, in the axis of symmetry 4, an inlet opening 5 is provided, through which the flue gases are brought into said vessel 1 via a supply tube 6.
Just outside vessel 1 said supply tube 6 has a bend 7 giving passage to a shaft 8, which on the one hand extends outside the interior of the apparatus and there is driven by means of a belt 9 and a pulley 10, and on the other hand, at its other end which extends to the interior of vessel 1, bears a fan 11 finding itself just below the inlet opening 5.
The axis of rotation of shaft 8 coincides with the axis of symmetry of vessel 1.
Fan 11 mainly consists of two horizontal circular plates 12 between which a plurality of vertical blades 13 are applied, the top plate being provided with a central opening closely fitting against the inlet opening 5 for the flue
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