氨水工质功冷联供循环内中温中压能的回收

本文提出两种采用引射器回收氨水工质功冷联供循环内的中温中压能量的改进方案,即通过回收热源能量将中温中压稀氨水工质加热至过热蒸汽状态后作为引射器工作工质分别用于:方案一,引射透平排汽以降低背压;方案二,引射蒸发器出口工质以降低蒸发压力.计算表明相同耗能下,相对于基础循环,方案一的净输出功提高0.9%、(火用)效率提高了0.8%;方案二的冷(火用)输出提高了11.1%,(火用)效率提高了0.7%,从而为有效回收系统内部能量提供了新的途径.

COMPARATIVE ANALYSIS OF PHYSICAL EXERGY RECOVERY PROPOSALS IN A COMBINED POWER/REFRIGERATION COGENERATION SYSTEM

In this paper, two proposals were investigated to reclaim the energy of the heat transfer and throttling process in the ammonia/water system for power/refrigeration cogeneration. The weak ammonia/water solution is superheated by internal heat recovery, and then its energy is converted into useful outputs by: proposals A and B in which the ejector is introduced to the cycle, the superheated stream is used as the primary stream, the turbine exhaust in proposal A and the evaporator outlet stream in proposal B are used as the secondary stream, respectively, and the energy is converted into power or refrigeration output. Simulation calculations show that, in comparison with the base cycle having the same energy consumption, the net power output in proposal A is increased by 0.9%, the refrigeration exergy output in proposal B is increased by 11.1%, and the exergy efficiencies of these two proposals are increased by 0.8%and 0.7%, respectively.