省煤器
过热蒸汽
余热回收装置
热交换器
锅炉(水暖)
热力学第二定律
熵(时间箭头)
烟气
余热
核工程
工艺工程
余热锅炉
热力学
材料科学
火力发电站
废物管理
物理
工程类
作者
B. V. Subba Reddy,G. Ramkiran,K. S. Kumar,Pranab Kumar Nag
标识
DOI:10.1016/s0017-9310(01)00293-9
摘要
In recent years a great deal of attention is focussed on the efficient utilization of energy resources with minimum heat loss. There is a growing interest on second law analysis to minimize the entropy generation in various thermal units and thereby to improve and optimize the design and performance. In the present work, a waste heat recovery steam generator is considered, which consists of an economizer, an evaporator and a super heater. The unit produces superheated steam by absorbing heat from the hot flue gases. A general equation for the entropy generation has been proposed, which incorporates all the irreversibilities associated with the process. By using suitable non-dimensional operating parameters, an equation for entropy generation number is derived. The effect of various non-dimensional operating parameters, on the entropy generation number are investigated. The role of gas specific heat, non-dimensional inlet gas temperature difference ratio ( τ ), heat exchanger unit sizes (NTUB, NTUS, NTUE) on entropy generation number are also reported. The results will help to understand the influence of different non-dimensional operating parameters on entropy generation number, which in turn will be useful to optimize the performance of the unit.
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