Boiler No. 3 at the power station of Dushanzi Thermal Power Plant has been in operation for a total of 606 days

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The No. 3 boiler at the Dushanzi Thermal Power Plant’s power station has been in operation for a total of 606 days. Author/Source: Dushanzi Online. Date: March 19, 2022. Number of views: 15. On March 2, the No. 3 boiler was shut down for maintenance as planned, after having operated continuously for 606 days. In 2020, the water wall anti-wear technology renovation was completed for Boiler No. 3 in Unit 3 of the thermal power plant’s power station. The company positions this as the commissioning of the first long-cycle testing equipment. On March 2, Boiler No. 3 had been in operation for a cumulative 606 days and was shut down for maintenance as scheduled. This maintenance work mainly involves a comprehensive regular inspection and assessment of the boiler itself, as well as the maintenance of auxiliary equipment. The focus is on inspecting the more than 1,700 air nozzles inside the boiler’s furnace; to date, it has been found that over 300 of these nozzles have suffered from coking. In addition, a comprehensive wall thickness inspection will be carried out on the water wall of the furnace chamber and the tail flue, along with a final data analysis and evaluation. Key points for maintenance: The key to long-term operation lies in the frequency of equipment maintenance. It is understood that in the past, the operating cycle of boilers ranged from 9 to 12 months; on average, there were around 9 maintenance sessions per year for the 6 boilers at the power station. Each maintenance session incurs considerable costs. Liu Haibao, deputy chief engineer of the Equipment Department in the Power Generation Operations Unit, explained: “We mainly reduce costs related to materials and construction expenses by decreasing the frequency of maintenance work.” At present, we expect only 4 scheduled boiler maintenance sessions per year, which is at least 4 fewer than before 2020. Roughly speaking, costs such as material expenses and construction fees can be reduced by about 5 million yuan. After inspecting the water wall of Boiler No. 3, and based on its wall thickness as well as the maintenance data from 2020, an assessment is made to determine the extent of wear on the water wall. This allows for a final evaluation of the reliability of this long-term operation, determining whether it is possible to extend the operating period further or to maintain the current one. ” At present, the maintenance work is proceeding as planned. The relevant departments of the thermal power plant and the construction team are working together to ensure high quality in the maintenance efforts and to strengthen management during the construction process. By comparing the various final data, a plan for the subsequent operation of the boiler will be formulated.