543 days! Maoming Petrochemical sets another record for the long-term operation of CFB boilers
Thread Content
Maoming Petrochemical: Sets another record for long-term operation of CFB boiler On October 9, Boiler No. 1 in Maoming Petrochemical’s refining area was shut down for maintenance as planned. To date, this boiler has been operating safely and steadily for 543 days, setting another record within Sinopec’s network for the longest period of operation under conditions of mixed combustion of coal and coke for boilers of this type. The boiler can operate for extended periods of time, allowing the frequency of maintenance to be reduced from once a year to once every three years. This lowers the maintenance intensity and shortens downtime. While ensuring a stable supply of steam for industrial production, it also **helps to save on maintenance costs; each reduction in the number of maintenance sessions results in savings on repair costs and generates additional revenue of over ten million yuan.
Technical efforts are being made to overcome the bottlenecks that hinder the stable operation of boilers. Affected by factors such as fuel technology, equipment condition, and operating parameters, the operational cycle of conventional coal-fired CFB boilers is generally around 10 months. In order to extend the operating cycle of the boilers, reduce maintenance costs and increase profitability, while also improving the reliability of boiler operation and minimizing unplanned shutdowns, the Thermal Power Division established an expert team to carry out targeted research on technologies for long-term boiler operation. They identified the key factors affecting the unplanned shutdowns of CFB boilers by examining boiler operation, process management, fuel control, and equipment integrity oversight. In total, 351 such key factors were identified, and 16 targeted projects with 84 measures were developed and implemented.
In the effort to improve the stability of boiler operation, technical personnel have carried out ongoing specialized research focused on the boiler’s operating conditions, in order to address the problem of frequent coal shortages in the coal bunker. Compared with the previous operating cycle, the wear rate of the boiler tubes and equipment in Boiler No. 1 has decreased significantly. The failure rate of the denitration nozzle nozzles has dropped by 50% on a year-on-year basis, the number of times the coal feeder runs out of coal has decreased by 60%, and the stability of the boiler’s operation has continued to improve. They carried out research on strengthening wear-prone areas through wire fusion to overcome the key technical problems that affect the long-term operation of boilers.
This post was last edited by pzhmotor on 2020-10-16 at 10:35. What size is the boiler? This operation cycle is amazing! Boilers require an external inspection once a year and an internal inspection every two years; they can operate by extending these intervals, which is really impressive. Are there any detailed materials? I want to learn *learn*. Under normal circumstances, the factors that affect the operating cycle of CFB boilers in order are: wear and detachment of the castable (especially at the inlet of the cyclone separator and in the dense phase zone) ； Windshield burnout and detachment ； Wear of heated tubes ； Air preheater perforations (wear and dew point corrosion) ； Faults in the coal feeding and slag conveying systems ； Fan system failure...... Wire welding is used to reinforce and protect wear-prone areas; this method is applied to membrane-type water wall tubes (many units can carry out this treatment after shutting down the plant, and it yields good results)