Method of determination and monitoring of fuel mass stream

A method of determination and monitoring of a fuel mass stream supplied for partial oxidation of fine-grain up to pulverized fuel to a gasifier, with the utilization of a radiometric density measurement of the fine-grain up to pulverized fuel conveyed by a gaseous medium and a volume stream measurement, the method comprising the steps of determining a total density .rho..sub.tot of a fuel stream conveyed by a fluidizing gas in an outlet conduit of a fuel bin with the aid of a radiometric density measurement;

• subsequently determining a total volume stream q.sub.v.sbsb.tot of said stream by a differential pressure measurement;
• determining a difference between volume streams of a fluidizing gas supplied to the fuel bin q.sub.v.sbsb.gas supplied and discharged from the latter q.sub.v.sbsb.gas discharged by differential pressure measurements;
• determining a volume stream of the fluiding gas q.sub.v.sbsb.gas by deducting from said difference a volume stream of a gas part q'.sub.v.sbsb.gas required for filling of a space volume of a discharge fuel from the fuel bin in accordance with the following equation:
• q.sub.v.sbsb.gas =(q.sub.v.sbsb.gas supplied -q.sub.v.sbsb.gas discharged)-q'.sub.v.sbsb.gas' ;
• determining the volume stream of the gas part q'.sub.v.sbsb.gas in accordance with the following equation:
• ##EQU6## wherein .rho..sub.K is the density of the fuel, .rho..sub.gas(b) is operational density of the fluidizing gas at a pressure and temperature in the fuel bin, and q'.sub.m.sbsb.k is the fuel volume stream determined by weighing in the fuel bin;
• and determining from a density of the fluidizing gas .rho..sub.gas as a material-dependent constant and from the thus obtained values the fuel mass stream q.sub.m.sbsb.K in accordance with the following equation:
• q.sub.m.sbsb.K =(.rho..sub.tot .multidot.q.sub.v.sbsb.tot)-(.rho..sub.gas .multidot.q.sub.v.sbsb.gas).