Particulate-analysis instrumentation for systems
Abstract
An optical instrument for in situ measurement of particle loadings and size distributions in the product gas of fluidized bed combustion is described. A prototype instrument was designed, constructed and then evaluated on bench scale and pilo systems. This instrument utilizes low angle forward scattering of light from particles illuminated by a laser. The instrument is not a particle counter. Rather, it collects scattered light continuously and simultaneously from all particles passing through the laser beam. The across-duct measurements of the scatter flux are converted to particle size and concentration data via an integral microcomputer. This instrument was tested on the Argonne National Laboratory fluidized bed combustor and on the Small Gas Turbine system at the Curtiss Wright Corporation. Comparison of optical measurements show good correlation with data from cascade impactors. Thus, it is concluded that aerodynamic and optical sizing of particles are comparable, at least for those cases where the size distributions are log normal.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- September 1981
- Bibcode:
- 1981STIN...8233693V
- Keywords:
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- Combustion Products;
- Gas Analysis;
- Optical Measuring Instruments;
- Particle Size Distribution;
- Concentration (Composition);
- Flue Gases;
- Fluidized Bed Processors;
- Gas Turbines;
- Instrumentation and Photography