Used Portable Millling Machine for Sale

It has long been known that most of the sulfur oxide content of flue gases can be removed by passing the gases through an aqueous slurry of lime or limestone. The wet lime/limestone processes in wide use today have been plagued with problems of corrosion, erosion, silting, plugging, scaling, and mechanical failure associated with the use of a slurry. In addition,used portable ball mill, the processes are very wasteful with respect to water, requiring vast settling ponds for waste sludge and often involving extensive discharge of liquid wastes into local waterways. The wet limestone process is also wasteful with respect to the scrubbing medium, utilizing only about 65% of the available limestone in the scrubbing process.

In an effort to eliminate the problems of operating a slurry gas scrubbing system, various dry processes have been developed. One such process involves the injection of finely ground dry limestone directly into the boiler of a power plant. This process had many inherent difficulties associated with the handling of large quantities of finely divided powder, and was only 30% efficient for SO2 removal. Other dry processes involve the physical adsorption of sulfur compounds on a dry bed of activated carbon.Granite Machinery these processes involve the carbon catalyzed oxidation of SO2 to SO3 which is hydrolyzed by water vapor, forming H2 SO4 which is readily adsorbed on activated carbon. Tolles, in U.S. Pat. No. 3,862,295, issued Jan. 21, 1975, disclosed that increasing the water vapor content of the flue gas enhances the rate of hydrolysis of SO3, hence increasing the overall SO2 removal rate. Tolles teaches that the overall SO2 removal rate on activated carbon is directly dependent on the relative humidity of the flue gas, rather than upon the temperature. One inherent disadvantage of the Tolles process is that it produces sulfuric acid. While at present sulfuric acid is in wide demand, it is foreseeable that with extensive use of high sulfur coal...