高炉煤气燃气-蒸汽联合循环系统建模及动态仿真

Modeling and Dynamic Simulation of a Blast Furnace Gas-Steam Combined Cycle System

为深入研究高炉煤气联合循环的动态特性,根据燃气-蒸汽联合循环系统的工作机理和具体结构参数,通过在Matlab/Simulink仿真平台上建立系统动态数学模型,分别在燃料组分、燃料旁通阀开度和IGV开度的阶跃扰动下进行了动态仿真。结果表明:燃料热值的波动对联合循环系统各热力参数均有一定影响;IGV开度对排气温度影响很大,且对汽机出力的影响不可忽视。

To further study the dynamic characteristics of a blast furnace gas combined cycle system,according to the working mechanism and specific structural parameters of the gas-steam combined cycle system,a dynamic mathematical model was established for the system on Matlab/Simulink platform,based on which,dynamic simulations were performed under the step disturbance of fuel composition,fuel bypass valve opening and IGV opening.Results show that the fluctuation of fuel calorific values has certain effects on the thermal parameters of the combined cycle;the degree of IGV opening has a great effect on the exhaust temperature,and its influence on the steam turbine output can not be neglected.