ENHANCEMENT OF WASTE HEAT RECOVERY DRIVEN POWER GENERATION BY CO-FIRING OF SOLID FUELS

摘要

The invention relates to a process for enhancement of waste heat recovery driven power generation by co-firing solid fuels, by increasing the temperature of vent gases of clinker cooler in the cement plant, the process step comprises: the said vent gases (13) at 130 to 230 deg C at outlet of clinker cooler are supplied to hot air generator (14)by opening damper (25) and closing damper (15) in the bypass duct (22). The solid fuels (16) such as coal are combusted in the said hot air generator. As a result the temperature of these clinker cooler vent gases is elevated. These hot gases (29) are mixed with the clinker cooler mid tap gases (12) of temperature 350 to 400 deg C by opening dampers (18) and (17). The temperature of the gas stream (19) is raised to about 450 to 500 deg C as a result of this mixing. The mixed stream of gases (19) is then supplied to waste heat recovery heat exchanger (20) to generate steam of temperature 410-450 deg C and at pressure 24-40 Bar(a). This steam of high pressure and temperature is used to drive the steam turbine.