Allied Chemical sulfur dioxide

The Allied Chemical Sulfur Dioxide Reduction Process for Metallurgical Emissions... 

Figure 1. Allied Chemical sulfur dioxide reduction technology typical roaster...

Once the feed stream has been purified, the sulfur dioxide and oxygen dimensions must be defined. Depending upon its source, the sulfur dioxide may vary from a few tenths of 1% to 100% (dry basis), in combinations with oxygen from 0% up to the line shown on Figure 2. The dotted line represents the gas composition that results when 100% sulfur dioxide (dry basis) is diluted with air. The only gas compositions to which Allied Chemical sulfur dioxide reduction technology is not directly applicable are those in the shaded area at the lower left of this diagram. This lower boundary represents a practical limit which has been established by heat balance and thermodynamic considerations rather than by economic factors. 

In view of the considerable interest in sulfur dioxide reduction to sulfur both in this country and abroad, Allied Chemical extended the use of this technology to control sulfur dioxide emissions from other metallurgical operations as well as from fossil fuel combustion. The experience gained in design, construction, and operation of the large Canadian facility provided the perspective for continuing process research and parallel engineering development. 

Engineering, procurement, and construction of the entire facility at NIPSCO is the responsibility of Davy Powergas, Inc. Allied Chemical is providing the sulfur dioxide reduction process technology as well as... 

In summary, Allied Chemical technology for reducing sulfur dioxide to elemental sulfur can be applied directly to a broad range of sulfur dioxide concentrations. As illustrated in Figure 6, the practical range for application of this technology extends from about 4% up to 100% (dry... 

The Wellman-Lord process can be a significant factor in helping domestic power plants to meet the air pollution abatement requirements of the Clean Air Act of 1970. To show its applicability to the utilities industry, Davy Powergas Inc. is building a demonstration installation at the Dean H. Mitchell Station of Northern Indiana Public Service Co. in Gary, Ind. When completed, it will consist of a Wellman—Lord sulfur dioxide recovery unit connected to an Allied Chemical Co. sulfur dioxide-to-sulfur reduction process to produce elemental sulfur. Davy Powergas guarantees emissions of 200 ppm by volume or less of sulfur dioxide at this facility. 

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