Combustion of calcium-exchanged coals

Effectiveness of calcium magnesium acetate as an SOX sorbent in coal combustion

“…The sorbent particles were conducted to the furnace by a fluidizer at constant air flow rate, Figure 1. The effluent gas from the furnace was passed through two gas-washing bottles in series, containing a solution of 1% H202 (Chang et al, 1986), Figure 1. In this medium SOz was converted to H2S04, the amount of which was determined by titration.…”

“…Criteria for the selection of the sorbent include: effectiveness, availability, cost, and stability of the products of sulfation. Extensive experimental work has shown that calcium compounds, such as limestone, are effective sulfur scavengers in gasification and combustion (Case et al, 1973;Chang et al, 1986;Sharma et al, 1987;Togan et al, 1989).…”

Effect of heterogeneous mechanisms during reburning of nitrogen oxide

“…Mild oxidation has been used to enhance the oxygen functional groups and the subsequent ion-exchange capability of carbonaceous materials (Chang et al, 1986). Following the same concept, Bartholomew et al (1991) and Gopalakrishnan et al (1994) produced char in the presence of oxygen and used the same ion-exchange/impregnation procedure discussed above.…”

Role of char during reburning of nitrogen oxides. Seventh quarterly progress report, April 1, 1995--June 30, 1995

“…The effects of calcium during oxidation of various solid carbonaceous materials has also been examined through a class of impregnatiodion-exchange techniques (Walker et al, 1979;Radovic et al, 1983;Hengel and Walker, 1984;Radovic et al, 1985;and Levendis etal., 1989 Mild oxidation has been used to enhance the oxygen hnctional groups and the subsequent ion-exchange capability of carbonaceous materials (Chang et al, 1986). Following the same concept, Bartholomew et al (1991) (1995) reported that calcium catalyzes NO-carbon reaction at 300 to 600°C through a mechanism that is consistent with the formation of intermediate CaO (0) surface species.…”