DUST CONCENTRATION MEASURING METHOD OF EXHAUST GAS

摘要

PROBLEM TO BE SOLVED: To provide a method of continuously accurately measuring a dust concentration of an exhaust gas of high concentration containing dust of 500 mg/m³ or more.;SOLUTION: In this dust concentration measuring method of exhaust gas with a microwave densitometer, microwave is radiated from a flange pipe disposed in a flue to the exhaust gas of high concentration flowing in the flue, and the concentration is measured using Doppler effect of microwave. In this method, the microwave is sent while the attaching angle of the flange pipe is set at an angle smaller than a vertically upward reference (0°) by 110°, the inside of the flange pipe is purged with a purge gas so that the product of the average flow rate (m/sec) of the purge gas and inner diameter (m) of the flange pipe becomes 0.0001-0.05 (m²/sec), a Doppler shift frequency band including from 500-1500 hz is selected, and the magnitude of the frequency is caught as a density of the dust concentration.;COPYRIGHT: (C)2007,JPO&INPIT