Stop operating system to carry out inspection and found a door bottom pressure heater water level orifice flowmeter in turn off the case, information loss caused by water level accurate measurement data frames, all normal hydrophobic tone can not according to the water level to carry out the adjustment, lead to bottom pressure steam heater side filled with water, bottom pressure heater drain according to the steam turbine generator 6 extraction steam pipeline and heating extraction steam pipeline overflow to the exhaust mouth of intermediate pressure cylinder in medium pressure exhaust temperature, reduce the second half of the lumen, medium voltage caused by the exhaust cylinder around half lumen entities about the difference in temperature between 120 ℃ and medium pressure exhaust cylinder back after the intermediate pressure cylinder pump seal curl deformation, medium voltage motor rotor motor axis and seal ring friction, due to the friction condition before the shutdown has not receded, lead to the adjacent piston pin bearing X axis vibration rising, and because of this unit is a high school of subsection cylinder structure, the high pressure cylinder in the middle of the piston pin load lighter, the other is the part of the high pressure steam inlet, vulnerable to other position of the peak, in the beginning of piston pin bearing X axis vibration up about three minutes later, together with the vibration caused by the piston pin bearing X axis to the rate of rise quickly, because I do it after make brake after steam turbine generator vibration value maintenance shutdown. Therefore, bottom pressure heater for water level accurate measurement is invalid, all normal hydrophobic tone can't all normal adjustment, water heater with reverse flow, is the root cause of the shutdown. Operation staff inspect dish, not in time after the unit starting to low water level is a bit low, all normal tone hydrophobic opening abnormal situation caused take seriously, subjectivity thought because of the low and normal hydrophobic and emergency hydrophobic side caused by leakage, no further inspection verification, miss timely handle the heater water level accurate measurement lost opportunities. Vibration occurs in the unit after the common faults of common failures due to logical thinking ability is not strong, can't timely treatment 6 period of extraction and the condition of the abnormal middle pressure cylinder exhaust temperature reduction, and harm the common troubleshooting of the accuracy and timeliness is the key to the shutdown.

2, preventive measures

1. Generating a tremendously to enhance the operation technical specification and 25 items anti-accident measures of training and learning training, understand the relevant provisions; To professional and technical training for all kinds of typical accident. Typical accident, formulate relative emergency management plan, and organization of operation value in practice exercises, the exercises the problems existing in the whole process to carry out the perfect, promote common troubleshooting work ability. In addition to have a purpose of training simulator study. From the common failure resolution to solve in the simulation on each exercise, improve operation staff professional skills and accident emergency management ability. “ Stop to prepare & throughout; During the period of operation staff to carry out the student actual operation unit to run the same position.

2。 Improve methods of operation and management. Improve operation staff key to run the sensitivity of the main parameters of the abnormal, the abnormal immediately find machine main parameters analysis and contact related personnel to carry out the solution, to prevent such malignant events came again; Regulation capacity of designed work daily key operation of machinery and equipment are the main parameters for track inspection, we find abnormal machine equipment operation main parameters to analyze the solution immediately.

3。 Lifting equipment maintenance, standard maintenance, maintenance, eliminating work, very is to improve the whole process of supervision, improve working ticket, the operation ticket management method, strictly abide by the two tickets management scheme and the status of the application of ticket is not standard to carry out completely. Seriously implement the acceptance of work rules and regulations, earnestly implement the responsibility system. The maintenance work of ascension, and improve the content of point set and standard maintenance a totally, truly give full play to the key effect on the maintenance work. Improve enterprise management technology professional maintenance staff and maintenance staff, professional technical training work, improve the ability to work.