Numerical Simulation Of Low Emission Combuster With Staged Combustion

With the continuous increase of environmental pollution in recent years,people are paying more and more attention to the issue of industrial pollution.Among them,as a power machinery equipment widely used in power generation,pipeline supercharging,ship and locomotive power and other fields,the low-emission technology of gas turbine has also received extensive attention and research at home and abroad.In 2012,the “Emission Standard for Thermal Power Plants” promulgated by the State required that the NOx and CO emissions from the gas turbine exit be lower than 25 ppm,which further promoted the research and development of low-emission combustion chambers.Currently,the world's advanced low-emission combustion chambers adopt dry low-emission combustion technology,mainly based on lean-burn premixed combustion technology,and are used in industrial gas turbines for gaseous fuels(mainly natural gas).However,the vast majority of current low-emission combustion chamber technologies achieve low emission targets in the 0.7 to 1.0 base load range and are difficult to achieve under lower load conditions,resulting in emission performance when industrial gas turbine units require low-load operation.Can not reach the standard.Therefore,it is necessary to conduct in-depth research on broadening the technology for the low-emission operating range of gas turbine combustion chambers.In this paper,the numerical simulation method is used to analyze the widening range of low emission operating conditions for a 15 MW class gas turbine combustion chamber.The main tasks are as follows:(1)Combining the research status of low-emission combustion chambers at home and abroad,the structural principle of the 15 MW combustion chamber is analyzed,and the method of applying the staged combustion technology and variable geometry technology to widen the range of low-emission operating conditions is obtained through one-dimensional calculation.(2)According to the existing combustion chamber numerical simulation method,using ANSYS CFX software,three-dimensional numerical simulation of the combustion chamber under 1.0 working conditions,and based on the calculation results analysis to optimize the original combustion chamber structure to achieve the design requirements,and finally Combustion chamber structure optimization program.(3)For the three-dimensional numerical simulation of the combustor with optimized structure under different working conditions,the effects of the staged combustion technology and variable geometry technology on the performance of combustion chamber emissions under low operating conditions are analyzed to verify the low one-dimensional calculation.The scope of emission conditions was broadened to analyze the scope of the low-emission operating conditions to broaden the feasibility of widening the range of low-emission combustion conditions of the combustion chamber to 0.5 to 1.0 operating conditions.