On the basis of analyzing the harm of ash slagging in heating surface of power plant boilers and the shortages of time-based quantitative sequential soot blowing methods

the monitoring methods for ash deposition and slagging in heating surface of utility boilers were reviewed

such as the monitoring methods based on the flue gas temperature at the furnace outlet

the heat flowmeter method

the temperature difference at back side of the water wall method

the monitoring method for furnace local pollution based on acoustic temperature measurement

the fouling monitoring technology for convection/semi-convective semi-radiative heating surface using clean factor

and the fouling monitoring technology for rotary air preheaters.Moreover

the deficiencies of researches on sootblowing optimization strategy and the current research hotspots were discussed

the application status of intelligent algorithm in boiler sootblowing optimization and the products and technical route of sootblowing optimization of large foreign companies were also summarized.