一次给水中断故障的原因分析与防范（Cause analysis and prevention of primary water supply interruption）.docVIP

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一次给水中断故障的原因分析与防范（Cause analysis and prevention of primary water supply interruption）.doc

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一次给水中断故障的原因分析与防范（Cause analysis and prevention of primary water supply interruption）

一次给水中断故障的原因分析与防范（Cause analysis and prevention of primary water supply interruption） Cause analysis and prevention of primary water supply interruption 1 brief introduction of equipment system Jinzhushan Power Plant No. 5 capacity of 125 MW, the water supply system with 2 DG500 - 180 type hydraulic coupler with the pump speed (No. 8 to No. 9 pump). Maximum speed 2970 R / min, the water temperature is 240 degrees centigrade under rated load condition. The boiler water supply pipe is not equipped with check gate. The water supply system is shown in figure 1. 2 fault passing Before the failure of No. 9 feed pump operation, unit load 90 MW, high input, the water temperature is 220 degrees centigrade, the normal water level of boiler drum + 30mm unit, the other parameters were normal. In March 16, 2001, the water pump should be switched to No. 8 feed pump to be repaired and replaced by 9. No. 8 feed pump starts, then increase the speed to 2750 At R / min, the feed water pressure and flow rate rise, and then reduce the speed of No. 9 feed water pump, but when it falls to 2650 At about R / min, the feed water pressure drops sharply until the drum pressure is lower than that of the drum. The water flow rate is zero, and the water level of the drum is decreased rapidly. At this point, pump current 8 is about 330 A, pump No. 9 current of about 260 A or so. Immediately 2 water pump speed to the highest value, water pressure and flow can not be restored, resulting in boiler water shortage, flameout, unit load burden. About 20~30 after the incident S found that No. 9 feed pump hydraulic coupler smoke, rapid shutdown No. 9 feed water pump, about 1 min, deaerator water level increased from 1700 mm to 2000 Mm, restart the pump No. 9, the pump speed increased, the water pressure and flow can not be restored, the unit failure to stop. The fault went through about 10 min. 3 cause analysis of trouble Check the water temperature records, start the No. 8 water pump after the water temper