Measures Against Incineration Problems Caused by Clogging of White Smoke Prevention Preheater

An incinerator that we operate and manage exhibited an abnormal increase in pressure and stopped working, which was a serious problem because it significantly affected the sludge treatment plan. When we disassembled the incinerator to inspect it, we found a large quantity of white solids attached to the interior of the white smoke prevention preheater. The pressure in the incinerator increased abnormally because these white solids clogged the exhaust-gas passage in the preheater.We analyzed the white solids and identified them as sodium carbonate and sodium sulfate. The sodium hydroxide solution that was sprayed on the white smoke prevention preheater reacted with the exhaust-gas components and formed the solids.Based on this cause, we took three countermeasures to prevent the formation and deposition of the solids. These countermeasures prevented the deposition of white solids and clogging of the preheater. As a result, continuous stable treatment of sludge was possible.