Patent ID: 9033704
Filing Date: 2015-05-19
Classification: F23C,F26B,Y02P

Abstract:
1. A method of recirculation of flue gas for a combustion system, the combustion system comprising in sequence at least one pre-combustion drying zone, at least one combustion zone, and at least a first cooling zone, the method comprising the steps of (i) providing a plurality of exhaust gas outlets comprising at least one exhaust gas outlet provided respectively to each pre-combustion drying zone and each combustion zone to allow a gaseous flow selectively to and through each exhaust gas outlet; (ii) providing at least one cooling zone intake means to each cooling zone; (iii) providing at least one flue gas delivery means each having at least one recirculation intake means and at least one delivery outlet; (iv) selecting at least one exhaust gas outlet from the plurality of exhaust gas outlets, and connecting the selected exhaust gas outlet to one of the recirculation intake means; (v) selectively delivering at least part of the gaseous flow from each selected exhaust gas outlet as a recirculation flow to the flue gas delivery means; (vi) selectively delivering at least part of the recirculation flow through one of the delivery outlets to the selected cooling zone intake means; (vii) monitoring at least periodically the temperatures and pressures in each cooling zone receiving the recirculation flow to determine temperature and pressure values; and (iv) adjusting the recirculation flow in response to the determined temperature and pressure values.