Effect of sorbent attrition on utilization. Final report
- Cincinnati Univ., OH (United States). Dept. of Civil and Environmental Engineering
The overall objective for 1992-1993 was to investigate ways of using chemical attrition to improve dolomitic sorbent utilization for duct injection processes. It is known that one of the primary mechanisms for poor sorbent utilization lies in the fact that the products of SO{sub 2}-sorbent reactions have such large molar volumes that they plug the pores necessary for SO{sub 2} to diffuse into the particle interior. Any method that may cause the fracture of used sorbent particles will thus expose fresh un-reacted surface of sorbent and result in available sorbent recovery. There are several mechanisms that may cause the breakage of particles. External mechanical stress may be exerted on a particle and cause particle fracture when it exceeds the cohesive forces to prevent the breakage. Heat and pressure can also induce particle fracture. In addition, chemical reaction is also a very important factor in leading to particle fracture. Among many sorbents currently used in desulfurization processes, dolomitic lime may be a good candidate for use in medium temperature duct injection. Dolomites are characterized by a large portion of magnesium (instead of high calcium) in the crystal structure of common limestones. Because of the special composition of dolomitic lime and its reactions with flue gas constituents under medium temperature duct injection conditions, a unique structure is formed for spent dolomitic particles that provides for the potential of recovering available sorbent just by hydration-induced particle fracture. By re-injecting the recovered sorbent, it is expected that a high sorbent utilization can be obtained.
- Research Organization:
- Ohio Coal Development Office, Columbus, OH (United States); Cincinnati Univ., OH (United States). Dept. of Civil and Environmental Engineering
- Sponsoring Organization:
- Ohio State Government, Columbus, OH (United States)
- OSTI ID:
- 10154807
- Report Number(s):
- OCDO--94012361; ON: TI94012361; CNN: Project OCRC/90-1.7
- Country of Publication:
- United States
- Language:
- English
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