JPS5649811A - Blowing method for slurry fuel - Google Patents

Abstract

PURPOSE: To provide a uniform blowing of slurry fuel into a furnace from a plurality of tuyeres by a method wherein a pressure loss in the slurry fuel return pipe is adjusted for its dispersion covering an entire length of the pipe in a mass feeding and a partial return system.

CONSTITUTION: Feeding volume of slurry fuel from the pump 5 is made to be higher than a blowing volume from the tuyeres of the shaft furnace 8, the remaining volume other than a blowing consumption volume is returned back to the tank 2 through the flow rate adjuster valve 11b, a return pipe 15. In this case,a degree of opening of the flow rate adjustment valve 11b is kept at a predetermined initial value, and a pressure loss is adjusted for its dispersion so as to apply a desired return pressure over an entire length of the return pipe 15 after the valve 11b. As its dispersion adjustment method, a branch pipe and the valves 16, 16' are arranged in the return pipe 15, 1) either one of the valves 16, 16 is opened to vary a length of the pipe, 2) similarly a pipe having a different diameter is selected, and 3) similarly a pipe having a different height is selected, etc. Accordingly, a pressure loss over an entire length of the return pipe 15 becomes substantially the same as a sum of the pressure loss in the entire length of the pipe ranging from the annular pipe 6 to the shaft furnace 8 and the furnace pressure, resulting in that a volume of blowing at the tuyeres is made to be uniform.

COPYRIGHT: (C)1981,JPO&Japio