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基于复间冷系统的组成及其功能,建立复间冷系统变工况数学模型,提出了工作于环境高温时段的制冷循环过程中,汽轮机排汽压力的变工况计算模型。该模型揭示出压缩机功耗、环境气温、迎面风速、排汽热负荷等主要因素对汽轮机排汽压力的影响;工作于环境低温时段的逆制冷循环(动力循环)过程中,膨胀机输出功率的变工况计算模型,分析得出汽轮机排汽压力、工质过热度、环境气温、迎面风速、排汽热负荷等运行因素对膨胀机输出功率的影响。以600MW虚拟复间冷机组为例,定量阐明了诸影响因素对汽轮机排汽压力和膨胀机输出功率的影响规律。
Based on the composition and function of the intercooling cold system, the mathematic model of the intercooling cold system was set up. The calculation model of the steam turbine exhaust pressure during the cooling cycle was put forward. The model reveals the influence of main factors such as compressor power consumption, ambient air temperature, oncoming wind speed and exhaust heat load on steam turbine exhaust pressure. During the reverse refrigeration cycle (power cycle) during low ambient temperature, the output power The calculation model of variable working condition is derived and the influence of steam turbine exhaust pressure, working fluid superheat, ambient air temperature, oncoming wind speed and exhaust heat load on output power of expander is analyzed. Taking the 600MW virtual intercooler chiller as an example, the influences of various influencing factors on steam turbine exhaust pressure and expander output power are quantitatively illustrated.