摘要
为探索高炉余能余热利用的新模式,并从热力学的角度寻求提高余能余热利用效率的方法,建立了高炉余能余热驱动的闭式回热布雷顿循环热电冷联产装置模型,应用有限时间热力学理论和方法对装置的灿用输出率和灿用效率进行了研究。通过数值计算讨论了回热器热导率和热电比的选择,优化了循环压比,分析了煤气放散率、压气机和涡轮机效率、制冷和供热温度、热风炉烟气侧热导率等设计参数对装置最优灿用性能的影响,发现存在最佳的供热温度使灿用输出率和灿用效率分别获得最大值。
In order to search the new utilization mode of residual energy and heat of blast furnace, and seek the ways that could improve the utilization efficiency of residual energy and heat from thermodynamic point, a closed regenerative Brayton cycle CCHP （combined cooling, heating and power） plant driven by residual energy and heat of blast furnace was established. Finite time thermodynamics was applied to investigate the exergy output rate and exergy efficiency. By numerical calculation, the selection of regenerator’s heat conductance and heat to power ratio was discussed, and the cycle pressure ratio was optimized. The influences of design parameters such as gas release rate, efficiencies of compressor and turbine, temperature of refrigeration and heat supply, flue gas-side heat conductance of hot blast stove, etc. on optimal exergetic performances of the equipment were analyzed. It was found that there existed optimal heating temperature which lead to a maximum exergy output rate and a maximum exergy efficiency separately.
出处
《钢铁研究》
CAS
2013年第5期9-13,共5页
Research on Iron and Steel
基金
国家重点基础研究发展计划(973)项目(2012CB720405)
国家自然科学基金项目(10905093)
