Based on the theory of boundary element method

a two-dimentional whole model of low-temperature superheater tubes' array for utility boiler has been established by using ANSYS software.In acoustic analysis software SYSNOISE

the sound field distribution characters in the space of model and on the tubes' surface during the time of sonic soot cleaning have been simulated and calculated.The results obtained from analysis are as follows:there is a great gradient of variation in sound pressure distribution at everywhere in the space of model;the sound wave energy in sound field around the final row of tubes is greater than the power radiated from the sound source due to reflecting effect of the rear wall to the sound wave.Through calculation of the sound pressure at points in the sound field

and extracting command from the results of calculation

the concrete location of dead corner for soot cleaning can be determined

and reblowing of soot may be carried out.