Low-NO_x combustion and experimental investigation in a rotary type pulverized coal classifier

In order to improve the combustion conditions, maximize the carbon burnout for low-NO_x firing systems and meet the requirements for ignition and flame stabilization as low volatile and low quality coal are burned in boilers, finer pulverized coal should be used. Hence, it is of great practical importance to study the rotary type classifier for the MPS type medium-speed mill. In this paper, we first review the low-NO_x combustion technology, then some model tests of rotating classifier are completed. The results show that the classifier performances are very satisfactory, with the fineness of the finished produce being R ₉₀ ^f <10%. Rules for designing and controlling rotating classifier are also developed in this paper.