Gas separation – With nonliquid cleaning means for separating media – Solid agent cleaning member movingly contacts apparatus
Patent
1989-09-18
1990-06-26
Nozick, Bernard
Gas separation
With nonliquid cleaning means for separating media
Solid agent cleaning member movingly contacts apparatus
552574, 55259, B01D 4700
Patent
active
049368800
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a scrubber. More particularly, the invention relates to a scrubber for recovering the energy in hot flue gases and simultaneously reducing the moisture content of the discharged cooled flue gases and separating any substances carried thereby.
Because of the ever-growing fuel costs, and in spite of more efficient heating plants and control systems, it has become increasingly important to make available heat recovery systems affording a better utilisation of the energy content of the fuel, thereby to reduce the total cost of, for example, house heating. Besides, the increasing environmental pollution has stimulated the development of systems for separating pollutants from the flue gases emitted by heating plants. Heat recovery and flue gas purification are preferably carried out simultaneously in a so-called scrubber.
However, prior art scrubbers suffer from several disadvantages. For example, the moisture content of the discharged and intensely cooled flue gases is frequently far too high and may cause corrosion in the chimney or the smoke pipe. To eliminate this problem, the flue gases must therefore be reheated, and this requires a certain amount of energy which is obtained from a separate source of energy. If, on the other hand, the flue gases are not intensely cooled in the plant, their energy content will be recovered less effectively, simultaneously as the moisture content may still be high and cause corrosion. Special facilities must therefore be provided for reducing the moisture content.
It therefore is the object of this invention to obviate the disadvantages of prior art scrubbers and to provide a scrubber which effectively recovers the energy content of the flue gases and maintains the moisture content of the discharged flue gases at a low level. This is achieved by heating the discharged flue gases by heat exchange with the incoming hot flue gases, and by recovering the energy content of the hot flue gases by heat exchange and water injection in an evaporation zone by means of an arrangement which ensures adequate evaporation of the injected water, and in a condensation zone in which the water vapour is condensed. To this end, the scrubber of the present invention has been given the characteristic features stated in claim 1.
The invention will now be described in more detail below, reference being had to the accompanying drawing which is a schematic cross-sectional view of the scrubber according to the invention.
In its preferred embodiment, the scrubber according to the invention comprises a casing 1 having an inlet 2 for hot flue gases from, for example, a heating plant (not shown), an outlet 3 for discharged, cooled and purified flue gases, said outlet being connectible to a chimney or the like, and an outlet 4 for condensate, water and separated pollutants. An internal smoke pipe 5 connected to the outlet 3 extends through the centre of the casing 1.
The lower end of the smoke pipe 3, which is positioned near the condensate outlet 4, comprises a widened portion 7 which serves as a drop separator 8 and preferably is in the form of a coke bed. At its end connecting with the outlet 3, the smoke pipe also has a widened portion 6 whose function will be described later. Below the widened portion 6, a heat exchanger 9 is arranged which is shown schematically and adapted to recover, when need arises, part of the heat content of the flue gases.
Along its inner side, the casing 1 is provided with a number of nozzles 10 through which water from an external system is injected by means of a pump 101. It should here be added that the interior of the casing is divided, by means of partition to be described later, into an evaporation zone 11 and a condensation zone 12. The water injected through the nozzles 10 has a relatively low temperature and is heated and evaporated in the evaporation zone 11, while simultaneously lowering the temperature of the flue gases and adsorbing the pollutants therein. The cold water injected into the condensation zone 12 contributes to recover
REFERENCES:
patent: 1940197 (1933-12-01), Wagner
patent: 3585786 (1971-06-01), Hardison
Katrineholm Tekniska Skola
Nozick Bernard
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