600MW直接空冷机组的防冻及解冻  

Antifreezing and Unfreezing of 600 MW Direct Air Cooling Unit

作　　者：孙立国 田亚钊 孙康明 

机构地区：[1]国电电力大同发电有限责任公司,山西省大同市037043

出　　处：《电力设备》2007年第5期20-23,共4页Electrical Equipment

摘　　要：大型直接空冷机组空冷凝汽器在冬季启动、停机过程以及低负荷运行阶段的防冻问题尤为突出。国电大同发电公司2×600MW直接空冷机组在2005年冬经受住了深调至300MW、-24℃恶劣气候的考验。文章总结了上述机组空冷凝汽器防冻及解冻措施及注意事项,比如,监视机组运行背压、逆流段的真空抽气温度、凝结水联箱温度等参数,采取相应的防冻措施,如停止逆流凝汽器单元空冷风机、轮换启停冷却风机、关闭隔音阀,退出部分散热面积等;采用解冻措施,如停止已有冻结现象的有关冷却风机、适当提高背压、启动备用真空泵、合理利用逆流单元冷却风机的反转功能等。Antifreezing is always a notable problem in the start-up in winter,shutdown process and low load operation period of air cooling condenser of large size direct air cooling unit.Two 600 MW direct air cooling units withstood the severe test of low load＇300 MW, - 24 ℃ foul weather in the winter of 2005.The paper sums up the effective antifreezing measures taken on the aforementioned air cooling condenser,for example,through to monitor the back pressure of trait, temperature of condensate collector etc.parameters,flexibly adjust air cooling fans operation etc. means,and meanwhile briefs the effective unfreezing measures of air cooling condenser.

关 键 词：直接空冷 防冻 解冻 运行方式 

分 类 号：TK264.1[动力工程及工程热物理—动力机械及工程]