Investigation of Carbon Monoxide Disintegration of Refractories in Coal Gasifiers. Annual Progress Report for the Period June 1, 1979-May 30, 1980

摘要

CO disintegration of high alumina castables is not likely to be a problem in coal gasifiers which operate at or near atmospheric pressure and above 800 exp 0 C. A 1000 h exposure to a simulated coal gasification atmosphere did not cause any visible damage or strength loss in any castable examined. CO disintegration of high alumina castables is a potential cause of refractory failure at high pressures; the time required for refractory failure rapidly decreases as pressure increases. The effect of even small amounts of iron impurities greatly accelerate the rate of disintegration. In coal gasifiers, CO disintegration is likely to affect the abrasion resistance of the refractories long before any of the more typical signs of CO disintegration appear. The 50% Al sub 2 O sub 3 castable is more susceptible to abrasion than the 90% Al sub 2 O sub 3 castable. The temperature range over which CO disintegration is active shifts to higher temperature as pressure increases. Alkali compounds, especially K sub 2 CO sub 3 , have no effect or slightly accelerate CO disintegration of high alumina castables. The 50% Al sub 2 O sub 3 castable disintegrates faster than the 90% Al sub 2 O sub 3 castable, possibly a result of the higher iron content of the calcined kaolin used in the 50% Al sub 2 O sub 3 composition. Stainless steel (AlSl 310, 316, and 446) reinforced castables possess very poor resistance to CO disintegation both at atmospheric and 1000 psi pressure. (ERA citation 09:037041)