PURPOSE: To improve a heat exchanging rate by a method wherein a main body of a drying machine is of a triple cylindrical structure, a sludge drying chamber performs an indirect radiation and heat transfer with hot gas at an outside of an inner cylinder and an inside of an outer cylinder and a gas flow drying is applied with the high temperature air being applied as a transporting medium within the sludge drying chamber.
CONSTITUTION: A main body 4 of a drying machine is comprised of a triple cylindrical member. A sludge drying chamber 5 at an intermediate part where sludge and transporting air pass is provided with an air blowing device lance tube in a longitudinal and axial direction of a cylinder. As a heat exchanging operation between hot gas and mud sludge fed into the main body 4 of the drying machine from a hot gas generating furnace 14 through a heat exchanger 20, an indirect heating system only with radiation and heat transfer is employed. At the sludge drying chamber 5, secondary air of high temperature indirectly heated with the heat exchanger 20 is utilized as air flow drying and transporting medium. Water vapour having bad odor substances which are dried and gasified is circulated and mixed at a high temperature part of the hot gas generating furnace 14 together with medium air. With such an arrangement as above, bad odor substances are oxidized at high temperature and changed into non-polluted state.
SATO TSUNEYOSHI
HIRAYAMA AKIRA
TOFUJI YOSHINORI
MORIKAWA NOBUYOSHI
MITSUBISHI NAGASAKI MACH CO