Development of Regenerable Hot-Gas Desulfurization Sorbents with Improved Pollutant Capture PropertiesEPA Contract Number: 68D10053
Title: Development of Regenerable Hot-Gas Desulfurization Sorbents with Improved Pollutant Capture Properties
Investigators: Adesanya, Babafemi A.
Small Business: REMSA Inc.
EPA Contact: Manager, SBIR Program
Project Period: September 1, 1991 through March 1, 1992
Project Amount: $49,919
RFA: Small Business Innovation Research (SBIR) - Phase I (1991) RFA Text | Recipients Lists
Research Category: Air Quality and Air Toxics , SBIR - Air Pollution , Small Business Innovation Research (SBIR)
Description:Currently, coal and residual oil-fired, steam-electric sta- tions are the largest source of atmospheric sulfur dioxide pollutants. The fractional contribution of sulfur oxide emis- sions from coal is greater than its fraction from oil used in power generation since the sulfur content of most of the coal is higher. Among the various alternatives that may be used to reduce the sulfur oxide pollution caused by coal- fired power generation plants, the advanced power genera- tion systems based on the integrated combined cycle generators and the molten carbonate fuel cells appear to have great potential. Currently the most advanced hot gas desulfurization process is based on the zinc ferrite sorbent. Recent studies with the zinc titanate sorbent have indicated that it has a higher operating temperature and limits the sulfate formation.
It is believed that the performance of zinc titanate sor- bents can be improved by the addition of some promoters to (1) decrease the effluent sulfur levels below 1 ppm, (2) increase elemental sulfur formation during regeneration, (3) facilitate the removal of other contaminants such as organic sulfur compounds and ammonia, and (4) increase the sulfur capture capacity.
The main objective of the proposed research is to study in detail the effect of promoters such as cobalt on zinc-titanium oxide sorbents, namely on their reactivity, stability, and regenerability over the temperature range of 538-870'C. Another factor that will be investigated is the ability of promoters to enhance elemental sulfur formation during regeneration. The results of the proposed investiga- tion will contribute to the commercialization of advanced power generation systems based on the integrated com- bined cycle generators and the molten carbonate fuel cells which are shown to have thermal efficiencies 15-30% higher than those of current coal-fired power generators.