SUPERCRITICAL WATER OXIDATIVE DECOMPOSITION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a supercritical water oxidative decomposition apparatus for sewage sludge or the like capable of eliminating the defect of a conventional supercritical water oxidative decomposition apparatus for sewage sludge or the like and capable of being operated stably and continuously by preventing the adhesion of scale and suppressing pressure loss. SOLUTION: In the apparatus wherein organic matter containing inorganic matter is reacted with an oxidizing agent in supercritical water to be subjected to supercritical water oxidative decomposition, first and second preheating means 12a and 12b for preheating a mixed fluid to be treated are provided to the front stage of a reactor 10 and the first preheating means 12a preheats the mixed fluid to be treated to <200 deg.C and the flow passage 11a of the mixed fluid to be treated provided to the first preheating means 12a has a cross-sectional area for allowing the fluid mixture to be treated to flow at a flow speed with less pressure loss. The second preheating means 12b preheats the fluid mixture to be treated flowing out of the first preheating means to 200 deg.C or higher and the flow passage 11b of the fluid mixture to be treated provided to the second preheating means has a cross-sectional area allowing the fluid mixture to be treated to flow at a flow speed making it hard to adhere a scale component to the inner wall of the flow passage.