Prototype Fly Ash Monitor for Incinerator Stacks

摘要

A prototype monitor for particulate emissions from municipal incinerators was designed, built and field tested. In operation, the instrument is installed on the stack some distance above the base to ensure the monitor's presence in a region of laminar flow. The monitor samples a predetermined quantity of stack gas either isokinetically or at a known velocity, separates the particulate from the gas by means of a cyclone, and measures the amount of particulate collected using a beta gauge. For each sample, the time of sampling and beta attenuation is printed out on a paper tape at some convenient location at ground level. It was concluded that the design concept is suitable for unattended monitoring operations. It was shown that the instrument measures stack dust loading under varying furnace operating and atmospheric conditions, and that automatic isokinetic sampling, while feasible, was not an essential requirement for adequately following stack loading. (Author)