复合制冷循环间接空冷系统环境气温敏感性分析

Ambient air temperature sensitivity analysis for indirect air cooled system with compound refrigeration cycle

为了定量评估环境气温高频、快速变化对复合制冷循环间接空冷(复间冷)系统热经济性的影响,以某亚临界600 MW的直冷机组性能参数和当地气象条件为基准,建立亚临界600 MW模拟复间冷机组,基于复间冷与直冷机组热经济性对比分析,构建环境高温时段模拟复间冷机组的运行背压与其热经济性转捩温度之间的定量关联;以复间冷机组年累计输出电量为目标量和汽轮机的设计背压为优化变量,对复间冷机组的设计背压进行优化选择;在环境气温分布特性的基础上提出厂址敏感性系数的定义及计算方法,计算结果表明:厂址敏感性系数越小,复间冷系统年累计输出电量越大.该结果可为复间冷系统设计、优化运行提供可靠的理论依据.

In order to quantitatively evaluate the influence of high frequency and rapid changes of ambient air temperature on the thermal economy of indirect air cooling system with compound refrigeration cycle（CRC-IAC）system,the performance parameter of a subcritical 600 MW direct air cooling（DAC）plant and the local meteorological conditions are taken as the benchmark,and the subcritical 600 MW simulation CRC-IAC plant was established.Based on the contrastive analysis of CRC-IAC and DAC plant,the quantitative association between operation exhaust pressure of CRC-IAC plant and thermal economy transition temperature at high temperature period（HTP）was analyzed.The annual cumulative output power（ACOP）of CRC-IAC plant as the target variable and the design exhaust pressure as the optimization variable,the design exhaust pressure of CRC-IAC plant system was optimally designed.A definition and calculation method of site sensitivity coefficient（SSC）was presented based on the ambient air temperature distribution characteristics.The calculation results show that the smaller the SSC,the bigger the ACOP.The analysis results provide a theoretical evidence for design and optimal operation of CRC-IAC system.