Abstract: The ash deposition and coking on the heating surface of a waste incineration boiler brings great challenges to the long-term stable operation. In order to take a reasonable and effective way of ash cleaning to extend the life of boiler heating surface, an experimental study of the shock pulse generators technology applied to clean ash in the second and third flue of a 660 t/d waste incineration waste heat boiler was carried out, and the effects of different ash cleaning modes on flue gas temperature were compared. The results showed that, in the comprehensive consideration of the ash cleaning effect, ash cleaning profit and the impact on the working conditions, operate normal mode at a frequency of once a day was the best plan, the outlet flue gas temperature of the second flue was reduced by about 10 ℃, and the flue gas temperature in the middle of the third flue was reduced by about 40 ℃ during long-term application. The results of this study can provide a reference for the selection and application of ash cleaning technology for waste incineration waste heat boilers, which can help to achieve the goal of its long-term stable operation.

Key words: waste incineration boiler, shock pulse generators, ash cleaning technology, boiler flue gas temperature, ash cleaning frequency