高炉余能余热驱动不可逆中冷回热燃气轮机热电联产装置的[火用]经济性能研究

Exergoeconomic performance investigation of an irreversible intercooled regenerative gas turbine heat and power cogeneration plant driven by residual energy and heat of blast furnace

建立了高炉余能余热驱动的变温热源不可逆中冷回热燃气轮机热电联产装置模型,以利润率为目标,用有限时间热力学理论和方法及有限时间经济分析法研究了装置的性能;导出了无量纲利润率和效率的解析式,分析了总压比给定和总压比变化两种情形,优化了中间压比和总压比;通过数值计算研究循环参数对装置性能的影响,讨论利润率和效率之间的关系,得出其特性关系为扭叶型;研究发现存在最佳的用户侧温度可以使利润率取得双重最大值。

A variable-temperature heat reservoirs irreversible intercooled regenerative gas turbine heat and power cogeneration plant model driven by residual energy and heat of blast furnace is established.The performance of the plant is investigated using finite time thermodynamics and finite time exergoeconomic analysis by taking profit rate as the objective.Analytical formulae about dimensionless profit rate and exergy efficiency are deduced.The two cases with fixed and variable total pressure ratios are analyzed,and the intercooling pressure ratio and the total pressure ratio are optimized.The effects of the cycle parameters on the performance of the plant are studied by detailed numerical examples.The relation between profit rate and exergy efficiency is discussed and the characteristic is loop-shaped.At last,it is found that there exists an optimal consumer-side temperature which leads to a double-maximum profit rate.