Numerical Simulation Of Turbulent Combustion Characteristics And Emissions In M701SDA Gas Turbine Combustion Chamber

Heavy gas turbine is by far the most efficient thermal power conversion type power generation device.The manufacturing and r&d capacity of heavy gas turbine can represent the development level of heavy industry in this country.After the conventional gas turbine burns high calorific value fuels such as natural gas and oil,a series of difficulties are brought to the combustion part of the gas turbine,the flow part of the turbine and the purification part of the gas due to the changes in fuel characteristics such as low calorific value and high dust content of the blast furnace gas.Therefore,the equipment and technology should be optimized when the blast furnace gas is used.Baotou steel(group)company in response to the national call for energy conservation and emission reduction,in the original thermal power plant on the new two installed capacity of 150 megawatts of low-calorific value gas combustion gas-steam combined cycle generator set,referred to as CCPP(combined cycle power plant).Gas and steam combined cycle power generation is coal gas and air is compressed to 1.5 MPa,burning in the combustion chamber,the high temperature and high pressure gas directly in the gas turbine(GT)of the expanding power and drive air compressor(AC)generator(GE)and complete combustion of single cycle power generation,gas turbine exhaust smoke temperature above 500?,through the high temperature flue gas waste heat boiler(HRSG)production of medium pressure steam,driving steam turbine(ST)power generation,a steam turbine is a supplement to the gas turbine power generation,and complete the combined cycle,to further improve thermal efficiency of the system.This paper M701SDA type gas turbine flow loop type combustion chamber for a full-size numerical simulation analysis,according to the combustor flame tube for physical measurement,three dimension computational geometry model is set up,on the basis of using the computational fluid dynamics and computational combustion theory knowledge,using commercial computer software(FLUENT)flow field numerical simulation analysis and NO_x emissions data for analysis.SolidWorks was used in the geometric modeling process to make solid drawings,generate 3d geometric models,import ICEM software for grid division,and use the mixed mesh of tetrahedral and hexahedral grids.RNG k-?turbulence model was adopted,and SIMPLE algorithm was used for pressure-velocity coupling solution.The calculated results can well reflect the combustion flow characteristics of the combustion chamber and determine the reasonableness of the combustion chamber design.By studying the combustion characteristics of low-calorific value gas and simulating whether the combustion chamber achieves stable combustion,the combustion condition can be optimized,which provides theoretical and technical support for further optimizing the structural design of the combustion chamber,improving the flow field structure,and realizing the stable and ultra-low emission working process of the gas turbine.