MAGNETIC TYPE PULVERIZED COAL FLOW RATE MEASURING INSTRUMENT

PURPOSE:To enable the flow rate of nonconductive pulverized coal flow to be magnetically measured by supplying a magnetic flux to a magnetic circuit by a magnetic flux generator. CONSTITUTION:A magnetic type pulverized coal flow rate measuring instrument is composed of a C-shaped iron core 5 wound around with an exciting coil 4, a pulverized coal transporting pipe 12 inserted in between the magnetic poles of the iron core 5, a signal detector 7 connected with a pickup coil 6 wound around the iron core 5, a flow rate calculator 9 for converting a signal from the detector 7 to a flow rate, and the like. When a current is supplied from a DC power supply 16 to the coil 4, the iron core 5 is excited and a magnetic flux 3 is supplied to a magnetic circuit. When pulverized coal is made to flow in the transporting pipe 12 in a direction 22, since the pulverized coal contains a magnetic material, the quantity of the magnetic flux 3 changes. A change thus produced induces a voltage to let a current flow in the coil 6 wound plural times around the iron core 5. The current thus induced is detected by the detector 7 and, after amplified, fed to the calculator 9 as output signals 8. The output signals 8 are compared with data obtained by an experiment in advance in the calculator 9 and a pulverized coal flow rate is calculated to be outputted as a flow rate signal 10.