摘要
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。
A mathematical model for the calculation of off-design operation of the CRC-IAC system was formed based on the system composition and function. According to mathematical model, an off-design calculation model of steam turbine exhaust pressure for refrigerating cycle during high ambient dry-bulb temperature period（HTP） was proposed. The calculation model reveales that compressor power, ambient dry-bulb temperature, face velocity of air cooling radiator（ACR） and exhaust thermal load are the main factors affecting the exhaust pressure. In addition, the off-design calculation model of expander power for power cycle during low ambient dry-bulb temperature period（LTP） was presented. The model analysis shows the influence of exhaust pressure of turbine, superheat degree of cooling medium, ambient dry-bulb temperature, face velocity of ACR and exhaust thermal load on the expander power. By using a virtual 600MW unit with CRC-IAC as an example,the influence law of the above factors on the turbine exhaust pressure and the expander power were clarified quantitatively through the specific simulation calculation.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第20期3308-3316,共9页
Proceedings of the CSEE
基金
北方联合电力公司科学技术项目(2010-BFKJ-SC-06)
中国华能集团公司科学技术项目(HNKJ08-H32)~~
关键词
复间冷系统
变工况特性
汽轮机排汽压力
膨胀机输出功率
制冷循环
逆制冷循环(动力循环)
indirect air cooled system with compound refrigeration cycle（CRC-IAC） system
off-design operation features
exhaust pressure
expander power
refrigerating cycle
inverse refrigeration cycle（power cycle）
