Selection of proper way for ash cleaning is every important aimed at features of high ash content in solid recovered fuel in China.

Way for ash cleaning of horizontally arranged steam boilers normally adopts mechanical rapping. The device uses accelerated velocity produced by hammer rapping to remove fly ash. Tube bundle fix the drooped structures through welding for both ends of upper header and make fly ash drop by rapping the end plate of lower header.

Besides adopting rapping device for ash cleaning, three layers of shock wave ash ejector holes are also reserved and arranged on the horizontal pass. If user combines the two in actual operating process, frequency of mechanical rapping can be reduced and the impact on heating surface welded junction of mechanical rapping position can be relieved.

The rapping dust cleaning system designed is a set of advanced dust cleaning system aimed at refuse incineration steam boilers. The system learned from practical experience of dust cleaning system design and operation of other similar projects, which is to remove boiler ashes on the heating surface of horizontal pass. The headers of the above area are arranged in a staggered manner, and known as upper header and lower header for convenience. 

The rapping dust cleaning system adopts pneumatic rapping to achieve the rapping of rapping position by using rapping dolly, which is equipped with two cylinders, corresponding to upper header and lower header. When the rapping dolly moves to the rapping point, the magnetic valve will open, and cylinders will work. The piston of cylinders strikes rapping rod, and the rapping rod transfers the force to the end face of horizontal pass header, so as to make fly ash drop by rapping the pipe wall of tube bundle.