Controlling emission of pollutants from coal-fired boiler systems

摘要

In a method of controlling emission of SOx, NOx and particulates from a coal-fired boiler system, that includes a boiler(10), an economiser (12) and a fabric filter baghouse (16), areagent/catalyst in powdered form is added (26) into the combustionflue gas stream intermediate the boiler (10) and economiser (12) at atemperature below the melting point of the powder. Thereagent/catalyst and ammonia (added at 28) are reacted with the SOxand NOx while the flue gas passes through the economiser (12). Further reaction is achieved as the gas is passed through a filtercake which forms on filter bags in the baghouse (16).