Optimization of Flow Matching Schemes for a Heavy Gas Turbine Burning Syngas

A heavy-duty gas turbine, designed for natural gas, was used to burn the syngas with two different calorific values. This study was mainly to optimize the flow matching scheme for the gas turbine. Two models of gas turbine burning syngas with different calorific values were established and the calculation models of different flow matching schemes were provided. The optimum scheme was obtained by evaluating thermal efficiency and work output under different operating conditions. The results showed that the highest unit efficiency was achieved by, without significant drop in work output, increasing the throat area of the turbine nozzle and reducing the initial temperature of the gas. On the premise of ensuring the safety of the gas turbine unit, increasing the pressure ratio of the compressor could further improve the unit efficiency and the work output. Simply adjusting the angle of the inlet guide vane fails to match the flow of compressor and turbine. The measures such as reducing inlet temperature of turbine or air bleed still need to be adopted, but the thermal efficiency dropped significantly in this process.