20 Atmosphere Rig PFBC Test Results: Tests 21 and 22. Further Investigations with Two-Stage Air Admission and Investigations with a Coal/Sorbent/Water Slurry

摘要

Two tests have been carried out in the 20 atm 1 ft x 1 ft pressurized fluidized-bed combustor to confirm earlier investigations (Test 13) in which it was found that sulfur capture was improved by admitting air at two levels in the bed. Operating conditions were 10 atm pressure; 1560 exp 0 F bed temperature; 4 ft/s fluidizing velocity related to the bed surface; 20% overall excess air, with 30% of the total air admitted at a level 5.6 ft above the main distributor. For one of the tests, the feedstock was a combined slurry of coal and sorbent. This was the first time that such a slurry had been fed into a PFBC. Although combustion efficiency and NO/sub x/ emissions were the same whether the feedstock was dry or a slurry, sulfur capture was lower when slurry was used. 9 figures, 19 tables. (ERA citation 10:017885)