Abstract
The authors developed a proto-type of a mass flowmeter using heat transfer for dense flow.
It is very important for measuring and control of distributing feedstock into plural tuyeres of direct iron reduction process, coal gasifier, direct coal liquifer etc. as a new process.
The authors developed a noninstrusive differential temperature sensing method for the mass flow rate 0-1, 000kg/h, mass flow ratio 0-47.2kg/kg using heat transfer cylinder 0.5m length of transport pipe 0.0175mφ by elertric heater 202.5W. The relation between the mass flow, the heat transfer coefficient and the time constant of the meter are analyzed and measured.
For 100μm aluminium oxide powder, over all heat transfer coefficient is maximum 286 W/m 2K, the thermal efficiency from heater to the differential temperature is maximually 121% and the time constant of the meter is 1.5min for 1, 000kg/h.
