SLAGGING COMBUSTION SYSTEM

摘要

Slagging coal combustion system suitable for retrofitting boilers, furnaces and industrial-process heat generators originally designed to burn oil or gas. It comprises a primary combustion chamber (14) into which oxidizer and fuel are injected to provide high-velocity, rotational-flow combustion zones, such that the fuel is burned substoichiometrically, while in flight, with up to 90 % of the resultant ash being removed as molten ash. The combustion products pass from the primary chamber to an expansion chamber (16) where slag is removed and the gaseous products are passed upwardly and thence to an end-use equipment, such as a boiler or industrial furnace, where air is added and final combustion takes place. Subsystems are provided to simultaneously minimize nitrogen oxides (NOX), and enable injection of sulfur sorbents into a fuel-rich portion of the combustion zone, enhancing capture of sulfur compounds in the slag. A coal-fired precombustor subsystem (12) feeds partially-vitiated air as the oxidizer to the primary combustion chamber.