Alkali metal vapor removal from pressurized fluidized-bed combustor flue gas: Annual report, October 1984-September 1985

A laboratory-scale pressurized fluidized-bed coal combustor (PFBC)/alkali sorber was used (1) to measure the alkali vapor (Na and K) concentration in PFBC flue gas on a real-time on-line basis, and (2) to demonstrate simultaneously the granular-bed sorber concept for the removal of alkali vapors from hot PFBC flue gas. An Ames alkali analyzer was used as an on-line, real-time monitor. A batch-type alkali and particulate sampling train (APST) was also installed as a backup for the analysis of both alkali vapor and particulate loading in the flue gas. The test results showed that the particulate loading in the flue gas which exited from the tertiary cyclone varied from 150 to 350 ppMW. The alkali vapor concentration measured by the Ames alkali analyzer was 700/sup 0/C)more » stainless steel tubing was shown to capture NaCl vapor. This observation suggested that the stainless steel tubing and parts used in the flue gas sampling line of the PFBC/alkali sorber facility could be a sink for the sodium vapor. Further study is needed to verify this postulation. 22 refs., 7 tabs., 15 figs.« less