内置稳燃热岛燃气锅炉内流动与传热数值模拟

1前言近年来,随着钢铁工业的迅猛发展,生产中的副产煤气大量增加。焦炉煤气和转炉煤气由于发热值高,可以在生产和生活中有效利用。而高炉煤气属低热值燃料,受到其燃烧特性的限制,很难作为远距离输送的生活用气,只能在企业内部转换利用[1]。为了充分利用自产的高炉煤气,国内钢铁

Numerical Simulation of the Flow and Heat Transfer in a Gas-fired Boiler with a Built-in Stable-combustion Heat Island

With a gas-fired boiler provided with a built-in stable-combustion heat island serving as an object of study and by making use of CFD software PHOENICS coupled with the in-boiler fluid flow,combustion and heat transfer process,a numerical simulation analysis has been performed of the gas flow and heat transfer characteristics of the boiler.The impact of an ignition-aid burner operating condition and an annular stable-combustion heat island on the gas flow and heat transfer process in the boiler was studied with a comparison and verification being made in production practice.The results of the study indicate that the corner-tangential layout of the burners and the presence of an annular heat island in the boiler are conducive to the stable combustion and the formation of tangential flow modes in the boiler,enhancing the agitation of flue gases in the boiler and making the furnace temperature distribution more uniform.As a result,the heat exchange efficiency of the heating surfaces in the furnace has been improved.Through an adjustment of the location of ignition-aid burners the stable combustion of a low heat value gas-fired boiler has been realized.The research results can serve as a guide during the design improvement and production organization of blast furnace gas-fired boilers.