On July 7, the reporter learned from the Shengli Power Plant that in order to ensure the smooth operation of the power grid during the peak power consumption in summer, the power plant’s No. 3 generator set has entered a minor repair stage. During the repair period, the power plant’s daily power generation has remained above 15 million kilowatt-hours. Prior to this, after 17 days of intensive overhaul, the power plant's first phase of two generating units minor repairs were successfully completed, and they have been successfully connected to the grid.

344 overhauls to be completed in 16 days

Strict management to eliminate hidden dangers of missing the Internet

On June 10, the main factory building of the first phase of the roar of the past fell silent, and the maintenance workshop entered a busy state of minor repairs. During the peak summer power consumption period, the first-phase unit must be shut down for maintenance to ensure full-load operation to ensure the health of the power generation equipment. "The minor repairs of the two units in the first phase only took 16 days, and 344 overhauls had to be completed. The overhaul tasks were very heavy." Pan Guangchun, deputy director of the Equipment Management Center of Shengli Power Plant, introduced the overhaul site, steam turbines, boilers and other major overhaul units posted red The blue and white "maintenance schedule". At the daily production morning meeting, each maintenance unit must report on the progress of minor repairs, invert the schedule, and cross-cooperate with each professional to ensure the progress and quality of minor repairs.

Shengli Power Plant incorporates safety concepts into minor repair work. As a key maintenance unit, the electrical department undertook the task of renewing and transforming the power distribution device of the 400V working section of the 2nd unit. In order to ensure the safety of personnel and equipment, the department conducted a systematic analysis of the operating status and safety risks of the equipment before repairs, compiled detailed work instructions, and formulated 21 risk control measures. The safety supervision team goes to the inspection site every day to conduct safety supervision. Once unsafe hidden dangers are discovered, they will be corrected in time to strengthen the closed-loop management of safety supervision. In order to effectively curb the "four-tube blasting", the boiler department insisted on the "required inspection every repair" during minor repairs. According to the location and reasons of the tube bursts of the two units in previous years, the key points of the lack of personnel for anti-wear and explosion-proof inspections, and the detailed inspection range of the heated surface. They overcame the harsh conditions of high temperature and large dust in the furnace, and found 44 hidden dangers of the "four pipes" and 4 major defects. After uncovering and inspection of the four induced draft fans, the Grey Water Department found that the blades of the induced draft fans of No. 1 furnace were severely worn, and the two induced draft fans of No. 2 furnace had serious dust accumulation and other hidden dangers. Maintenance personnel collect and summarize the original data, count equipment defects, analyze and formulate maintenance plans, and prevent any hidden danger from becoming a "fish that slips through the net".

Using cameras to monitor key areas

Inspect the safety hazards of key parts in time

During the two-unit shutdown of the first-phase unit, the two units in the second-phase became the power support point of the oilfield power grid. Therefore, Shengli Power Plant has increased the inspection of important auxiliary equipment such as coal mills and air blowers, and at the same time increased the monitoring of the panel. It has continuously strengthened through measures such as strengthening inspection index assessment and strict "two votes, three systems" management. Operators have a sense of responsibility to improve the quality of inspections and monitoring.

At the same time, in order to ensure timely detection of hidden equipment hazards, operators make full use of industrial cameras to strengthen 24-hour continuous monitoring of key areas and flammable and explosive areas. As the temperature continues to rise, optimizing the operation mode of the cooling water system of the unit is one of the important means to ensure the safe operation of the unit. The operation department of the second phase improves the cooling efficiency of cooling water by checking the temperature gauge of the inlet medium of the cooler, increasing the input of the cooler, adjusting the inlet valve of the cooler, etc., and regularly inspects the coolers and heat exchangers of the main equipment. , Strictly prevent the occurrence of incidents such as low heat exchange efficiency and cooler leakage. At the same time, the rotation direction of the air preheaters of the two units was adjusted to reduce the opening of the cold air door of the pulverizing system, reduce the boiler exhaust temperature, and improve the boiler combustion efficiency.

The fuel department strengthens dry coal reserves and the management of rain and flood prevention in coal yards, responds to the adverse effects of heavy rain on coal blending, ensures the normal operation of the pulverizing system, optimizes the work of blending bituminous coal, and scientifically formulates fuel blending plans to avoid causes Wet coal will reduce output and strive for more power generation. Strengthen the investigation of hidden dangers of equipment in key areas and key parts, change the monthly combing and summary of various safety hazards to weekly combing, weekly notification, and monthly summary, carefully organize the investigation, increase inspection and verification efforts, and formulate rectification measures or pre-control plans. Ensure that all kinds of personal and equipment major safety hazards are under control.

Since entering the high temperature weather, the plant promptly discovered and dealt with more than 300 equipment defects such as high temperature of the main transformer and water leakage at the inlet of the cooling water pipe caused by the blockage of the cooling fan filter of the main transformer, laying the foundation for the safe operation of the equipment.