Gas and liquid contact apparatus – With external supply or removal of heat – Plural distinct contact zones
Patent
1984-06-14
1986-03-04
Lacey, David L.
Gas and liquid contact apparatus
With external supply or removal of heat
Plural distinct contact zones
261130, 261131, 165 3, 165 60, 165125, 55 20, 55 90, 55222, B01D 4706, B01D 4712
Patent
active
045740623
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to treating a contaminated gas, in particular a gas at elevated temperature and in most applications air, to purify the gas and give it properties to make it reusable. In particular, the invention relates to the treatment of air to give it a selected degree of purity, a predetermined temperature and a predetermined relative humidity, simultaneously making possible a diminution of the heat consumption required to make the air suitable for use in heating a living space.
Within many industries, there is a demand for processing air as well as for inlet air to industrial buildings having accurately selected temperature and relative humidity. The air, at least as far as it is to be used as inlet air for heating living space, is subject to exacting standards of purity. As typical examples of such industries where high relative humidity is a must there are the textile industry, weaving industry, and paper industry, because in such industries dry air creates severe problems of static electricity. As a byproduct of such industries, large flows of air of elevated temperature are produced, which air may be more or less contaminated. Theoretically, it would seem desirable at least during winter to utilize the heat content of such air by purifying and reconditioning it, with respect to its temperature and relative humidity, and then recirculating it to the living spaces or for reuse in the industrial process that created it.
It is known in the prior art to scantily purify such heated and contaminated air, that is, to purify it only so far is required to avoid environmental problems, and then to expel the air into the surrounding atmosphere. To satisfy the demand for inlet air for heating, it has been common practice to use large quantities of fresh air from the surrounding atmosphere. But, at least during winter, large amounts of energy must be added to fresh air for the required net temperature increase and for vaporization of the quantities of water required to increase the very low moisture content of the air.
It is an object of the present invention to substantially eliminate such problems by simultaneously providing for a purification of, a heat recovery from and a recirculation of heated outlet air in such a manner that the outlet air alone or admixed with a quantity of fresh air, treated in the same manner, attains a desired purity, temperature and relative humidity.
Said object is attained according to the invention by executing a method or using an apparatus as defined by the accompanying claims.
The invention will be more closely described with a reference to the accompanying drawings, in which
FIG. 1 schematically illustrates an apparatus for carrying out the method according to the invention.
FIG. 2 is a simplified cross-section of an embodiment of the first stage of an apparatus laid out as illustrated by FIG. 1, and
FIG. 3 illustrates in additional detail the apparatus shown in FIG. 2.
The invention enables saving large energy quantities by cleaning, climatizing and recirculating outlet air from different kinds of processes. Energy savings can be provided by means of a direct heat recovery from the warm outlet air and due to the fact that the process air, at least in part, is recirculated. The heat content of the process air is used as a substitute for the heat bound by the vaporization of such quantities of water which are necessary for increasing the relative humidity of the air to a desired value.
According to the invention the process air, possibly admixed with fresh air from outside, is conducted through a flow duct enclosing a number of contact or deposition surfaces, onto which are deposited and collected such impurities as have been carried by the gas or have been dissolved therein or admixed therewith. In a preferred embodiment of the invention, the gas is conducted in such a manner that the contact between the gas and said contact surfaces will be intimate, and, further, in such a manner that the gas repeatedly is forced to change flow direction, so that particles, d
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Eslinger Lewis H.
Lacey David L.
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