This article will review several design and operational problems that will negatively affect the collection performance of an ESP. It will also outline potential modifications to help improve performance and efficiency.
Aspect ratio
The aspect ratio of a precipitator compares the horizontal run of collecting surface to the height of the precipitator. In general, the aspect ratio of a well-designed ESP should be greater than 1.0. In the example shown here, the aspect ratio would equal 0.8, not a good design for the most effective collection performance.
In addition to design limitations which can often be rectified by equipment modifications, operational problems are sometimes visually evident, either through inspections or performance tests.
Examples include the following issues that can be easily identified during offline inspections:
Warped collecting plates
Heavy dust buildup on plates and wires
Dust mounds on inlet turning vanes
Dust mounds on perforated plate vs clean perforated plate
Erosion and corrosion of rapper shaft from air in-leakage at boot seal
These operational problems can often be identified with more detailed performance tests such as running V-I curves or evaluating voltage control results:
B&W’s comprehensive evaluation services can help you better understand what’s happening inside your precipitator. We can provide an easy-to-understand report card of the health of your ESP, interpret the results, and offer solutions to improve overall performance.
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