Chemically Active Fluid-Bed Process for Sulphur Removal During Gasification of Heavy Fuel Oil -Second Phase.

摘要

The Chemically Active Fluid Bed process is a means of avoiding sulphur oxide pollution while using heavy fuel oil for production of power. The process uses a fluidised bed of lime particles to convert the oil into a hot,low sulphur gas ready for combustion in an adjacent boiler. Sulphur from the fuel is absorbed by the lime which can be regenerated for reuse. During lime regeneration the sulphur is liberated as a concentrated stream of SO2which may be converted to acid or elemental sulphur. The report describes the second phase of studies on the chemically active fluid-bed (CAFB) process for desulfurizing gasification of heavy fuel oil in a bed of hot lime. The first continuous pilot plant test with U.S. limestone BCR 1691experienced local stone sintering and severe production of sticky dust during startup. Batch tests confirmed that BCR 1691produced more dust than the purer Denbighshire or U.S. BCR 1359stones. With BCR 1691, 10times more dust was produced during kerosene combustion at 870C than during gasification/regeneration. The continuous pilot plant was modified to improve operability under dusty conditions.