| 摘要 |
PURPOSE:To make it possible to measure mass flow rate without contact with a mixed phase flow by measuring density at two places of a mixed phase flow, utilizing a radiation ray and obtaining the flow rate by calculating the correlation of components of variation in the density signals from two places and calculating the mass flow rate from the density signal and flow rate signal. CONSTITUTION:On a pipe channel 1 in which a mixed phase flow such as powdered coal, for instance, is flowing, radiation sources 2 and 3 are mounted. Radiation detecting means 4 and 5 are positioned that are opposite to the radiation sources 2 and 3 to form density metersIand II. The density metersIand II are placed with a specified distance L between them, and the output of those density meters are given to a correlation calculation circuit 8 through a high input amplifiers 61 and 62, and an exponential reverse conversion circuits 71 and 72. The circuit 8 outputs signal Q related to flow rate, and a signal rho related to density is output from the average value of the output signal of the circuit 71. Both outputs are input to a multiplier 9. By this input the mass rhov of a mixed phase flow can be given. With this arrangement a mass flow meter of simple construction can be provided. |
