On-Line Monitoring System for Monitoring SO2 in Fumes（2） — Monitoring Subsystem for SO2 Flow Velocity and Flow Rate

A SO2 on-line monitoring system (CEMS) has been developed by the author based on the principle of electrochemistry. This system consists of SO2 mass concentration monitoring subsystem (the subsystem had been described in on-line system for monitoring SO2 in fumes（1）) and SO2 flow velocity and flow rate monitoring subsystem. In the paper, the working principle and procedure of SO2 flow velocity and flow rate monitoring subsystem are described in detail. In the meantime, an advanced method for measuring average flow velocity of fumes by mean of “velocity field constant” is presented. A innovative device has been developed to detect velocity field constants automatically, which has resolved the technical difficulty in automated monitoring of fumes average velocity in the flue.