摘要
针对已经投运的火电机组,设置管道和阀门实现邻机冷端系统互联,充分利用邻机调停备用机组的冷端系统(自然通风冷却塔、空冷塔、空冷岛)以降低运行机组背压,在改动量较小的条件下达到进一步降低机组能耗的目的。本文以600 MW等级机组的湿冷系统、表凝式间接空冷系统和直接空冷系统3种冷端形式为例,概述了冷端系统邻机互联的技术方案,并计算分析了邻机互联改造后机组额定负荷下的节能效果。结果表明:环境空气湿球温度22.5℃时湿冷机组背压下降0.9 k Pa;环境空气干球温度33℃时表凝式间接空冷机组背压下降9.57 k Pa;环境空气干球温度33℃时直接空冷机组背压下降5.55 k Pa。该结果可为火电机组降低背压、实现节能降耗提供参考。
Neighbour inter-connection on cold end system for the operating units was carried out by setting corresponding pipes and valves, and then the cooling equipments of outage unit, such as natural ventilation cooling tower, air cooling tower and air cooling condenser, were fully utilized by the operating unit, therefore the cooling capacity was enhanced and the back-pressure decreased. Taking the three typical kinds of cold end system such as wet cooling system, indirect air-cooling system and direct air-cooling system for 600 MW units as the example, technical scheme for neighbour inter-connection on cold end system was summarized and the energy conservation effect of operating unit under rated load was obtained. The results show that, after the neighbour cold end system inter-connection, the unit back-pressure decreased by 0.9 kPa at ambient air wet-bulb temperature of 22.5 ℃ for wet cooling system, by 9.57 kPa at ambient air dry-bulb temperature of 33 ℃ for indirect air-cooling system, and by 5.55 kPa at ambient air dry-bulb temperature of 33 ℃ for direct air-cooling system. The results can provide references for reducing back pressure and realizing energy saving for thermal power units.
出处
《热力发电》
CAS
北大核心
2017年第10期88-93,105,共7页
Thermal Power Generation
基金
中国华能集团公司总部科技项目(HNKJ15-H09)~~
关键词
冷端系统
湿冷系统
表凝式间接空冷系统
直接空冷系统
背压
邻机互联
节能
cold end system, wet cooling system, surface-condensed indirect air-cooling system, direct air-cooling system, back pressure, neighbour interconnection, energy conservation
