Dynamic study of carryover deposition in kraft recovery boilers using an entrained flow reactor

An Entrained Flow Reactor (EFR) was built to simulate conditions experience d by carryover particles in the upper section of a recovery boiler and to o btain controlled samples of carryover deposit and collect fundamental data on deposition and removal processes under controlled conditions. In this st udy, the dynamic deposition of synthetic carryover particles on a temperatu re-controlled tube surface was investigated as a function of particle size, velocity and chloride concentration, the results show that for particles b etween 40 and 590 mu m, significant deposition occurs only when the chlorid e content exceeds a critical level, between 2.5 and 5 mole% Cl/(Na+K). Abov e this level, the deposition rate increases as the chloride content increas es, up to about 10 mole% (cl/(Na+K) and then levels off for higher chloride concentration. The deposition rate also increases with an increase in part icle size and velocity.