GB1089203A - Improvements in or relating to fluid flow measuring devices - Google Patents

Abstract

1,089,203. Measuring fluid-flow. INTERNATIONAL COMBUSTION (HOLDINGS) Ltd. July 21, 1964 [Aug. 15, 1963], No. 32377/63. Heading G1R. [Also in Division F4] Apparatus for measuring fluid-flow along a pipe comprises fluid velocity head measuring means mounted in a pipe section through which the fluid flows, a constriction in said section and means for measuring the fluid-pressure drop across the constriction. In the measurement of the flow of pulverized fuel through a pipe 1 the velocity head in a pipe section 2 inserted in the pipe is measured by a manometer (not shown) connected differentially to a pipe 7 projecting diametrically into the section 2 and a pipe 12 terminating at the section wall. A manometer is also provided to measure the pressure differential existing between the interiors of Piezometric rings 15 and 18 connected to apertures 13 and 16 at the entrance and throat, respectively, of the Venturi 3. This differential pressure is dependent upon both rate of flow of air and the content of entrained fuel, whereas the velocity head is dependant solely upon the rate of flow of air. Thus by calibration of the manometers the fuel content in the air flow may be obtained. In an alternative embodiment a number of tubes 7 each with an associated tube 12 are employed, the tubes 7 and 12 being connected to separate Piezo-metric rings. The invention may be utilized for controlling the supply of solid fuel to a pulverizing mill for entrainment in an air stream and carrying to a burner (see Division F4).