| 摘要 |
PCT No. PCT/FI92/00210 Sec. 371 Date Jan. 24, 1994 Sec. 102(e) Date Jan. 24, 1994 PCT Filed Jul. 9, 1992 PCT Pub. No. WO93/02331 PCT Pub. Date Feb. 4, 1993.A fluidized bed gas cooler assembly includes a fluidized bed gas cooler with a metal inlet duct for directing hot process or flue gases into the cooler as fluidizing gas. In order to remove deposits which form on the duct inner surface a cooling fluid is passed into and then out of contact with the outer surface of the inlet duct so that the cooling fluid increases in temperature (but does not change phase) and so that deposits which form on the inlet duct interior surface become brittle and readily disengageable. The deposits are disengaged at different times by pulsation of the cooling fluid (especially where the inlet duct is a metal spiral tube), effecting pulsation of the temperature of the cooling fluid, or subjecting an enclosure surrounding the duct or the exterior surface of the duct itself to a sudden mechanical force. |
