Combustion System

Abstract

Combustion system. The system includes a combustor generating a combustion gas and a splitter for receiving the combustion gas and dividing the combustion gas into first and second gas streams. A temperature controller receives the first gas stream, mixes it with recycled gas and introduces it into a heat recovery steam generator at a desired temperature. A mixer receives the second gas stream, mixes it with recycled gas and introduces it into the heat recovery steam generator. The cool gas that exits the heat recovery steam generator forms the recycled gas. A suitable combustor is an oxy-coal combustor.

1 . Combustion system comprising;
 a combustor generating a combustion gas;   a splitter for receiving the combustion gas and dividing the combustion gas into first and second gas streams;   a temperature controller for receiving the first gas stream, mixing it with recycled gas and introducing it into a heat recovery steam generator at a desired temperature;   a mixer for receiving the second gas stream, mixing it with recycled gas and introducing it into the heat recovery steam generator;   wherein cool gas exits the heat recovery steam generator, the cool gas forming the recycled gas.   
     
     
         2 . The combustion system of  claim 1  wherein the combustor is an oxy-coal combustor. 
     
     
         3 . The combustion system of  claim 1  further including recycling fans to pressurize the recycled gas before mixing with the first and second gas streams. 
     
     
         4 . The combustion system of  claim 1  wherein the mass flow rate of the second gas stream, temperature at an inlet of the heat recovery steam generator, and flow rate of the recycled gas are controlled to optimize the system.