摘要:

The reactivity towards liquefaction of a Kentucky ♯9 seam coal and its extrudate (from the Jet Propulsion Laboratory’s 1.5‐inch coal extruder) was measured in a micro‐autoclave. A glass lined 10‐cc reactor was designed so that gas pressure and reactor temperature could be monitored continuously. The use of a fluidized sand bath furnace, relatively coarse mesh coal, and reactor geometry designed to promote ebullient mixing, provides highly consistent results without mechanical agitation. Conversion reproducibility for all runs has been better than ±2%. The thermomechanical history of the extrudate (about 1 min at 425°C) has only a slight effect upon reactivity: coal and extrudate afford similar conversion curves at 435°C, with maxima at less than 15 min. Conversions of coal and extrudate calculated on the basis of fixed carbon are virtually identical.

ISSN:0094-243X    

DOI:10.1063/1.32906

出版商:AIP    

年代:1981

数据来源: AIP

摘要:

Fluidized‐bed combustion uses our coal reserves to produce steam or electric power in an environmentally acceptable manner, however, the calcium in the sorbent is only partially utilized. A method of increasing the calcium utilization has been discovered in which the spent sorbent is hydrated to reactivate it for additional use. Hydration produces calcium hydroxide which is subsequently dehydrated when the material reenters a combustor. The hydration‐dehydration cycle alters the pore structure allowing further sulfation. The effectiveness of the method was verified by tests made in the ANL 15 cm atmospheric fluidized‐bed combustor. A continuous‐bed cooling and hydrating system is proposed to reactivate the spent sorbent and recover both the sensible heat and the heat of hydration. The kinetics of the hydration reaction using steam have been investigated, and test results from a fluidized‐bed hydrator are presented.

ISSN:0094-243X    

DOI:10.1063/1.32908

出版商:AIP    

年代:1981

数据来源: AIP