Numerical Simulation Of Syngas Combustion Characteristics In Gas Turbine

With the rapid development of China's economy,on the one hand the domestic electricity demand has greatly improved,on the other environmental requirements are more severe.So integrated gasification combined cycle power generation technology has played a more important role in the field of thermal power generation because it is clean and highly efficient.This requires research and development for syngas-fueled gas turbines.This requires research and development for syngas-fueled gas turbines.At present,there is little research on the combustion characteristics of syngas in practical gas turbine operation.The gas turbine efficiency and system efficiency reach the maximum when the maximum pressure is 12 MPa and the primary compression ratio is 1.54.In this paper,the thermal system model of the new Integrated Gasification Combined Cycle power generation system is established.Through the thermal calculation of the model,the pressure ratio of the system is optimized with the output power and efficiency as the target.Under this condition,the output power of the gas turbine is 594778 kW and the gas turbine efficiency is 42.33%.The total output power of the system is 836462 kW and the system efficiency is 59.53%.The optimal pressure ratio is set as the pressure environment of the gas turbine syngas combustion numerical simulation.In this paper,the synthesis gas combustion in the combustion chamber is simulated by different conditions,and the combustion characteristics of syngas under different ratio of carbon to hydrogen,syngas active component,swirl intensity and gas preheat temperature are analyzed.Based on the analysis of temperature field distribution,flow field distribution and pollutant discharge,the flame characteristics and NO_x emission law of combustor combustion syngas are summarized and summarized.The results of this study show that: The decrease of the ratio of carbon to hydrogen will enlarge the core high-temperature region,which is beneficial to the combustion of syngas in the gas turbine,but will increase the generation of thermal NO_x,and the temperature of the exhaust gas will rise slightly.The syngas active composition increased from 70% to 90%,combustion efficiency increased,the combustion chamber outlet temperature increased,NO_x emissions also increased.The increase of the air swirl intensity and the preheat temperature of the gas will enlarge the core high temperature zone,favor the combustion and strengthen the flue gas flow in the combustion chamber.Both to increase the temperature of the gas turbine outlet,improve the efficiency of the engine,but also to reduce the NO_x emission.