DEVELOPMENT OF THE TRILATERAL FLASH CYCLE SYSTEM .1. FUNDAMENTAL CONSIDERATIONS
DEVELOPMENT OF THE TRILATERAL FLASH CYCLE SYSTEM .1. FUNDAMENTAL CONSIDERATIONS
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DOI：
10.1243/pime_proc_1993_207_032_02
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发表时间：
1993-01-01
影响因子：
1.7
通讯作者：
SMITH, IK
中科院分区：
文献类型：
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作者：
SMITH, IK
从低品位热源回收电力的世界市场每年约为10亿欧元。其中许多是热液体或气体，当液体的初始温度为100摄氏度时，常规电力系统将不到2.5%的可用热量转化为有用的电力，而初始温度为200摄氏度时，上升到8-9%。考虑到这种单相热源可回收的最大功，认为理想的三边循环是电力回收的最佳手段。三边闪蒸循环(TFC)系统是实现这一理想的方法之一，它只涉及液体加热和蒸汽的两相膨胀。回顾了与此相关的前人工作，并给出了详细的分析研究，将该系统与各种类型的简单朗肯循环进行了比较。结果表明，如果能使两相膨胀机达到75%以上的绝热效率，在100-200℃温度范围内从热液流中回收能量，TFC系统的输出功率可以比简单的朗肯循环系统高80%。单位净产出的估计成本大约等于朗肯循环系统的成本。TFC电厂的首选工质是轻烃。
The world market for systems for power recovery from low-grade heat sources is of the order of L1 billion per annum. Many of these sources are hot liquids or gases from which conventional power systems convert less than 2.5 per cent of the available heat into useful power when the fluid is initially at a temperature of 100 degrees C rising to 8-9 per cent at an initial temperature of 200 degrees C. Consideration of the maximum work recoverable from such single-phase heat sources lends to the concept of an ideal trilateral cycle as the optimum means of power recovery. The trilateral flash cycle (TFC) system is one means of approaching this ideal which involves liquid heating only and two-phase expansion of vapour. Previous work related to this is reviewed and details of analytical studies are given which compare such a system with various types of simple Rankine cycle. It is shown that provided two-phase expanders can be made to attain adiabatic efficiencies of more than 75 per cent, the TFC system can produce outputs of up to 80 per cent more than simple Rankine cycle systems in the recovery of power from hot liquid streams in the 100-200 degrees C temperature range. The estimated cost per unit net output is approximately equal to that of Rankine cycle systems. The preferred working fluids for TFC power plants are light hydrocarbons.