Microbeam provides advanced analysis and services applicable to electrostatic precipitators to address the challenge of poor particle collection due to changes in fuel characteristics.
Particle collection in electrostatic precipitators occurs through the following three functions:
- Suspended particles become charged in an electric field
- Particles migrate from the gas stream to the collection surface
- Collected particles are removed from the collection surface and deposited in hopper
However, this process can become less effective following changes in fuel and operating conditions.
Microbeam identifies the problem through advanced fuel analysis, which provides the size and composition distribution of the particles. Based on this information, we can determine the resistivity and cohesivity of the ash and identify steps toward achieving more efficient particle collection.
Particulate Matter Analysis and Characterization
Understanding challenges in meeting particulate emission limits, Microbeam provides enhanced sampling and characterization of particulate matter.
Microbeam utilizes a particle sampler in field testing applications. The impactor size classifies fly ash particles into four size fractions. Each fraction can be analyzed to determine the mass and chemical composition. Microbeam uses its SEM to image and provide chemical analysis of the particles.
The impactor size fractions are >10 to less than 1μm; if needed, some of the stages can be removed from the assembly to make a simpler setup. The particles are collected on 25 mm substrates on the impactor stages, and a 47 mm filter on the back-up filter stage. The impactor is shown at right. An example of mass/size/composition distribution for the particles is shown below.