Heat exchange – With scraper removing product from temperature modifying...
Patent
1982-05-12
1986-02-11
Cline, William R.
Heat exchange
With scraper removing product from temperature modifying...
165 95, 1510404, 1510416, 122379, 122390, F28G 108, F28G 116, F28G 1504, F28G 900
Patent
active
045693889
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of treating a gas of elevated temperature, which is contaminated by mainly condensable contaminations, said gas in many cases consisting of air, in order to simultaneously purify the gas and recover heat therefrom, as well as removing contaminations from the equipment used for the purification.
In many industries, large quantities of contaminated air is being produced, said gas being heated so that recovering heat therefrom will seem attractive. Contaminations present in the air may be of different kinds, such as from processes within the plastic industry, the surface treatment industry, textile, or paper industry. Common is the difficulty to separate them from the gaseous carrier due to their chemical or physical characters or because of the fact that the contaminations after having been separated out, give rise to such severe treatment or pollution problems used for their separation so that the apparatus does not function to satisfaction. In particular, this is the case with contaminations which in a condensed and cooled-down state attain a high viscosity and show high adhesion to surfaces. As a consequence thereof, the purification in such situations has only been driven so that it has been possible to let the gas enter into the surrounding atmosphere without causing severe environmental problems. Because of the burdensome contamination problems created, substantial heat recovery from the gas has not been possible.
Efforts have been made as a solution to the problems referred to above to use separators in which the surfaces have consisted of glass, the idea being that the glass would present poor adhesion to contaminations deposited thereon so that the contamination problems would be diminished. In practice, however, the function of this type of equipment is poor and in many cases a dismounting and cleaning is required.
An object of the present invention is to eliminate the problems referred to and to provide a method and an apparatus for treatment of gas of elevated temperature, primarily air, so that its condensable contaminations are separated and simultaneously heat recovery is obtained and the separated contaminations are removed. This object is attained according to the invention by use of a method or an apparatus for carrying out the method, respectively, having characteristics according to the appended claims.
In the following, the invention will be described more closely with reference to the accompanying drawings, in which
FIG. 1 is a longitudinal section through an apparatus for carrying out the method according to the invention,
FIG. 2 is a longitudinal section of a detail indicated a in FIG. 1, and
FIG. 3 is a corresponding cross-section.
The apparatus illustrated by FIGS. 1-3 thus shows an apparatus for the purification of a gas by condensing under simultaneous heat recovery is provided as well as the separated contaminations are removed without the apparatus being taken out of operation.
In said apparatus gas to be purified, in many cases consisting of air, is flowing in FIG. 1 in the direction indicated by arrows A and B, the flow being guided by shells or the like (not shown). As shown in FIG. 1, the apparatus comprises a lower, horizontal group of collecting tubes 29 and an upper group of collecting tubes 30, extending parallel to the collecting tubes 29 of the lower group. The tubes 29 and the tubes 30 are arranged perpendicular to the flow direction of the gas indicated by arrows A and B at selected mutual distances from each other. Vertical depositing and heat exchanging tubes 31 extend between the upper collecting tubes 30 and the lower collecting tubes 29. Parallel rows of such tubes 31 are arranged in the longitudinal direction of the collecting tubes 29 and 30. To have the apparatus to work according to the counter-current principle, the lower collecting tube 29 farthest to the left in FIG. 1 is provided with an inlet (not shown) for a heat recovering medium, while the upper collecting tube 30 located farthest to the right in FIG. 1 has
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Derwent's Abstract No. A 8511, D/05, SU 735 903, 5/28/80.
Cline William R.
Eslinger Lewis H.
Ford John K.
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