Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-06-06
1991-08-13
Nozick, Bernard
Gas separation
Means within gas stream for conducting concentrate to collector
165159, 03C 300, B03C 300
Patent
active
050393189
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an improvement in wet electrostatic precipitators intended for cleansing moist and dust-laden gases and being of the kind which include a separator unit, a cooling condenser integrated with the separator unit, and emission electrodes which are disposed within a plurality of collector electrodes which extend through the cooling arrangement.
Electrostatic precipitators are used, for instance, for cleansing dust-laden gases deriving, inter alia, from sulphuric-acid production processes, metal-smelting processes, and coal-combustion and waste combustion-plants.
When the moist and dust-laden gases contain a given moisture content, the electrostatic precipitator will preferably have the form of a so-called wet electrostatic precipitator. Unfortunately, the moisture-saturated gases cause corrosion problems.
In the case of wet electrostatic precipitators which are intended, for instance, for treating moisture-saturated process gases and flue gases which contain Cl.sup.-, F.sup.-, SO.sub.2, SO.sub.3, etc. and other highly corrosive components, it has hitherto been necessary to manufacture in particular those components and parts of the precipitator subjected to corrosion attack from lead or plastics material. These materials have been found satisfactory from the aspect of corrosion in many instances, although they have, unfortunately, obvious limitations or, in many instances, have been highly unsuitable with respect to the fulfillment of other properties and characteristics which determine the function of the precipitator. The formation of cracks is one example of the problems which result from the use of lead and pastics material, although other problems also arise. Another example is that the surface of precipitator parts made from a plastic material are water repelling (hydrophobic), which prevents the formation of a uniformly dispersed liquid film on, for instance, the collector electrodes.
Steel exhibits clear advantages from a functional aspect. Steel constructions are wear resistant, dimensionally stable and can be readily inspected and examined. Furthermore, the material possesses good electrical properties and hydrophilic surface properties, i.e. properties which are directly decisive to the functional characteristics and performance of wet electrostatic precipitators, for instance.
The use of a highly-alloyed, stainless steel in, for instance, wet electrostatic precipitators is limited by the extent to which the steel can withstand the troublesome operating environment generated by moisture-saturated gas and elevated temperatures, without becoming corroded too quickly. Improved resistance to corrosion can be achieved by selecting certain stainless steel-alloys of high alloy contents. However, such high-alloyed steels are also subjected to corrosion, and in many cases to an unacceptably high degree of corrosion, when the temperature of the saturated gas begins to exceed, e.g., 40.degree.-60.degree. C.
In order to provide an improved corrosive environment for steel, it is particularly suitable to integrate a condensing cooling device in the actual precipitator unit of the electrostatic precipitator. The provision of a separate device for cooling the flue gas prior to said gas entering the separator unit of the electrostatic precipitator constitutes a considerably more expensive solution from an economic aspect.
Unfortunately, serious corrosion problems are also experienced in connection with wet electrostatic filters having integrated condensing cooling devices, since, as a result of varying degrees of unevenness in cooling of the hot gasses, the inner surface of the collecting electrodes which surround the emission electrodes and which may have the form, e.g., of hollow tubes, take-up the liquid condensing from the moisture-laden gas to be cleansed in the electrostatic precipitator.
The object of the present invention is to provide a simple and useful arrangement by means of which cooling of the gases in the integrated cooling device in the wet electrostatic precipitator i
REFERENCES:
patent: 1393712 (1921-10-01), Steere et al.
patent: 1473806 (1923-11-01), Bradley
Boliden Contech AB
Nozick Bernard
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