Research On High Pressure Combustion Characteristics Of Natural Gas With Dual-Swirler

Energy is the main driving force for national economic development, in order to achieve sustainable socio-economic development, it’s necessary to ensure the safe and reliable supply of energy and the clean and efficient utilization of the energy. With the rapid development of China’s economy, the domestic demand for electricity has greatly improved, as while as the requirements of environmental protection are more severe. Under these circumstances,the gas-steam combined cycle(GTCC), as a safe, efficient, clean power generation, gains increasing attention, and being widely usedin our country.For development of the gas turbines, the current trend is to improve the system parameters and capacity,which is mainly to improve gas turbine inlet temperature. However, due to limitations of the material, it’s hard to increase the inlet gas temperature of turbines.The increasing of the inlet temperature will make the gas turbine suffer a high temperature and stress state, increasingthe factor of operation instability. Moreover, the high-temperature combustion may lead to more NOx and other pollutants generated, which will make the pollutant control more difficult.Therefore, improving the compression ratio of the Brayton cycle becomes another effective way to improve the system thermal efficiency.This paper designed a combustion chamber, combined with a dual-swirl technology, that suit for a new type of high-pressure reheat combined cycle, with reference to domestic and combustion chamber design methods and principles, the law designed to burn under high pressure is suitable for high pressure combustion chamber, and studied the principles of combustion in high pressure. The research includes flame shape, temperature distribution, flow field distribution and pollutant emissionsetc. aimingto findthe rules of the high-pressure combustion characteristicsand pollutant emissioncharacteristics.This paper began with introducing the dual-swirl combustion technology, and then introduced high pressure combustion chamber combined the dual-swirl combustion technology, and then the designed combustion chamber was modeled and divided with gridby using Gambit. At the same time, network-independent testing and the cold state simulation were performed to ensure the accuracy of the simulation.After that, the high-pressure combustion thermal simulation performed under different conditions by using Fluent. Firstly the influence of the high pressure on the combustion characteristics were studied; and then in high-pressure conditions, the effects of different power, equivalence ratio and differentarrangement of swirlers on flame shape, temperature field distribution and flow field distribution and pollutant emissions etc. were analyzed. At the end, from these simulation results, the characteristics high pressure dual-swirl combustion were summarized, which will provide theoretical support for further experimental study on the high-pressure test rig.