METHOD FOR MEASURING FLOW RATE OF PULVERIZED COAL

• Main Authors: HIROMI TOSHIYUKI, YOKOYAMA ISAO, HAYASHI KAZUHIRO, FURUKOSHI HIROBUMI, NAKAJIMA KUNIHIRO, WADA RYUZO, NISHIO TOSHITAKA, KAWAKAMI MASAMICHI
• Format: Patent
• Language: English
• Published: 20.05.1994
• Edition: 5
• Subjects: CRUSHING, PULVERISING, OR DISINTEGRATING; CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; MILLING GRAIN; PERFORMING OPERATIONS; PHYSICS; PREPARATORY TREATMENT OF GRAIN FOR MILLING; TESTING; TRANSPORTING

PURPOSE:To obtain a highly reliable flow rate measuring equipment having a long service life in which coal supply quantity is determined simply through calculation by inputting a coal supply amount per unit time, primary air flow rate, and an output from a frictional electromotive force sensor to an operating circuit. CONSTITUTION:Feeder 2 for a coal feeder 1 is provided with a coal supply quantity detector 7 comprising a tachometer for carrying belt and a load cell for measuring the weight on the belt. A coal supply quantity signal detected through the detector 7 is passed through a function generator 14 to produce a signal D expressed in terms of the grain size of pulverized coal and the signal D is fed to an operating circuit 15. The operating circuit 15 operates an average air flow basing on a primary air flow received from an air flow transmitter 9 and the inner diameter of a pulverized coal pipe 4. A frictional electromotive force sensor 10 is disposed in the way of the pulverized coal pipe 4 and outputs from two electrode rods 11, 12 inserted into the pulverized coal pipe 4 are fed to the operating circuit 15 where a flow rate of pulverized coal is calculated according to the formula; flow rate of pulverized coal = sensor output X grain size/(velocity of flow)c(where, C is a constant).