转炉煤气驱动开式燃气轮机CCHP装置FTT建模与优化

炼钢转炉余能余热主要包括转炉烟气的显热和转炉煤气的潜热以及转炉渣的显热，合理回收利用转炉余能余热是实现转炉负能炼钢的关键。建立了转炉煤气驱动的开式燃气轮机热电冷联产(CCHP)装置有限时间热力学(FTT)模型。以装置总可用能率和第一定律效率为目标，在无煤气质量流率和装置尺寸约束下，优化了压气机进口相对压降和压比，得到了最大总可用能率和相应的煤气质量流率；在煤气质量流率和装置尺寸约束下，优化了压气机进口相对压降，得到了最优效率，同时联产装置各部件的面积分配也得到了优化。分析了煤气显热利用、放散率、循环总温比、发生器工质温度和供热温度等参数对装置最优性能的影响。

FTT Modeling and Optimization of an Open Gas Turbine CCHP Plant Driven by Basic Oxygen Furnace Gas

The residual energy and heat of basic oxygen furnace （BOF）mainly contain sensible heat of basic oxygen furnace flue gas,latent heat of basic oxygen furnace gas （BOFG）,and sensible heat of BOF slag.It is very impor-tant to reasonably recover the residual energy and heat of BOF for achieving ‘minus-energy’steelmaking.A finite time thermodynamics （FTT）model of an open gas turbine CCHP （combined cooling,heating and power）plant driven by BOFG is established.By taking total useful energy rate and first law efficiency as objectives,when there is no constraint for gas mass flow rate and total size of the plant,the relative pressure drop of compressor inlet and pressure ratio are optimized,and the maximum total useful energy rate and the corresponding gas mass flow rate are obtained.In the case of constraints for gas mass flow rate and total size,the relative pressure drop of compressor in-let is optimized and the optimal efficiency is obtained;the flow area distributions of components of the plant are also optimized.The effects of parameters （such as sensible heat utilization of the gas,gas release rate,cycle temperature ratio,generator working fluid temperature and consumer-side temperature,etc.）on the optimal performances of the plant are analyzed.