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This post was last edited by zgj2405 on 2011-2-19 at 12:00. Improving the thermal efficiency of a boiler means increasing the effective utilization of heat and reducing various heat losses in the boiler; the key aspects here are reducing the heat loss due to exhaust gases and the losses resulting from incomplete combustion. (1) Reduce the heat loss in boiler flue gas. 1) Reduce the air leakage rate of air preheaters, especially that of rotary air preheaters. 2) Strictly control the quality parameters of the boiler water; when the scale accumulation inside the water wall tubes reaches 400 mg/m, acid cleaning should be carried out promptly. 3) Use high-quality coal with a low sulfur content as much as possible, and reduce the air temperature at the inlet of the air preheater. Modern large-capacity power generation boilers are equipped with air preheaters to prevent dew formation on the heated surfaces at the cold end of the air preheater, which could lead to low-temperature corrosion of the air preheater. The service life of the air preheater is extended by increasing the air temperature at the inlet of the air preheater and raising the flue gas temperature of the boiler (resulting in increased flue gas heat loss). (2) Reduce heat losses due to incomplete combustion in machinery. 1) Adjust the combustion conditions according to the boiler load and time; ensure proper air distribution, and lower the position of the flame center in the furnace as much as possible, so that coal can burn completely within the furnace. 2) Adjust the coal feed rate based on the volatile matter content of the raw coal and time, so as to maintain the optimal coal quantity. (3) Reduce the heat loss of the boiler; mainly by strengthening the maintenance and inspection of the insulation layers on the boiler pipes and the boiler body.