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Languages : en
Pages : 12
Book Description
The objective of this investigation is to determine the effects of SO2 partial pressure and reaction temperature on the conversion of sulfide containing solid wastes from coal gasifiers to stable and environmentally acceptable calcium-sulfate, while preventing the release of sulfur dioxide through undesirable side reactions during the stabilization step. An additional objective of this program is to investigate the use of the Spent Sorbent Regeneration Process (SSRP) to regenerate spent limestone, from a fluidized-bed gasifier with in-bed sulfur capture, for recycling to the gasifier. To achieve these objectives, selected samples of partially sulfided sorbents will be reacted with oxygen at a variety of operating conditions under sufficient SO2 partial pressure to prevent release of sulfur from the solids during stabilization that reduces the overall sorbent utilization. Partially sulfided limestone will also be regenerated with water to produce calcium hydroxide and release sulfur as H2S. The regenerated sorbent will be dewatered, dried and pelletized. The reactivity of the regenerated sorbent toward H2S will also be determined. During this quarter sulfidation tests were conducted in a quartz fluidized-bed reactor in which the selected calcium-based sorbents were first calcined and then were reacted with hydrogen sulfide at ambient pressure and 1650°F. These tests were conducted with each sorbent in two particle sizes. Chemical analyses of the partially sulfided sorbents indicate that the extent of sulfidation was in the range of 40--50%. The partially sulfided material will be reacted with oxygen to determine the effects of temperature and SO2 partial pressure on the stabilization of the calcium sulfide in solid waste materials. 23 refs., 1 fig., 2 tabs.
