US 5,090,233 AGranted

In-line analyzer for particle size distribution in flue gas

AssigneeJapan as represented by Director General of Agency of Industrial Science and Technology

InventorsNobuyuki Kogure, Masaaki Shirahase, Ikuo Tamori

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Abstract

A particle-size distribution analyzer in a vent gas or flue gas which can be in a gas carrying line of a dust- and/or mist-producing process is provided. The analyzer comprises: a series of particle-size classifying units each consisting of a gas-ejection nozzle of an opening having a diameter different from the others and an impaction plate mounted on a revolvable turret in such a fashion that the series of the units can communicate with a suction nozzle in the gas flow line one by one successively in a decreasing order of the nozzle opening diameter; and a light-scattering particle-concentration detecting system which gives the concentration data after particle-size classification as a function of the cut-off size of the particles contained in the gas. In another embodiment, a heater to evaporate the liquid constituent in the mist particles and a second concentration-detecting system are provided downstream of the first concentration-detecting system so that measurements of the particle size distribution can be conducted for the dust particles and mist particles separately.

Claims2

Dependent claims

An in-line particle size analyzer for a gas containing dust particles, mist particles or a combination thereof which comprises:

(a) a gas flow line having a suction nozzle;
(b) a revolvable turret built in the flow line of the gas mounting a plurality of particle size classifying units, each unit consisting of a gas-ejection nozzle and an impaction plate positioned to face the gas-ejecting opening of the gas-ejection nozzle keeping a distance, arranged at equal distances from the revolving axis of the revolvable turret in such a fashion that, when the revolvable turret is revolved, the gas inlet opening of each of the gas-ejection nozzles is successively communicated with the outlet of the suction nozzle of the gas flow line, the gas-ejection opening of each of the gas-ejection nozzles having a different diameter from the others;
and
(c) a light-scattering particle-concentration sensor unit downstream of the revolvable turret, in the gas flow line comprising a light projector to project light to the gas flowing in the gas flow line and a light detector to detect the light from the light projector after being scattered by the particles contained in the flowing gas.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 07/662,576Filed 1 Mar 1991
Priority: JP 2-1766484 Jul 1990
Granted: 25 Feb 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G01N 15/0255
Investigating particle size or size distribution: with mechanical, e.g. inertial, classification, and investigation of sorted collections
G01N 21/85
Systems specially adapted for particular applications: investigating moving fluids or granular solids
G01N 21/534
Within a flowing fluid, e.g. smoke: by measuring transmission alone, i.e. determining opacity
G01N 2015/0261
With mechanical, e.g. inertial, classification, and investigation of sorted collections: using impactors