Wet ESP Material Selection

Introduction The selection of materials of construction for Wet Electrostatic Precipitators (wet ESPs, or WESPs) is a challenging problem. With metals, over specifying the alloy can make the project non-economical, while selecting an insufficient alloy may threaten...

Wet ESP Benefits Advantages

Introduction As environmental requirements continue to change, the demand for better gas cleaning technology grows. This trend has continued to push the development of a relatively old technology – the wet electrostatic precipitator (wet ESP, or WESP). The man who...

RTO Basics

IntroductionThe question often arises: Why can’t one operation’s RTO operate for decades, while another cannot? Regenerative thermal oxidizers (RTOs) that control volatile organic compounds emitted by a wide variety of industrial processes are widely accepted. As a...

Wet ESP Flow Direction

Introduction Flow direction in a Wet Electrostatic Precipitator (wet ESP) is extremely important. In contrast, flow direction in dry ESPs is of such little importance it isn’t even a consideration; virtually all dry ESPs operate in the horizontal flow mode.   Wet ESPs...

Gas System Flow Rate Measurement System

Perhaps the most fundamental parameter to be measured in gas handling systems is the flow rate. Determining the best method for measuring flow rate can be difficult. For low-pressure, non-toxic gas streams the pilot-tube…

Wet Scrubber vs Dry Scrubber Differences

Frequently, wet scrubbers fail to achieve expected performance because the incoming hot gas stream evaporates the scrubbing fluid thus producing a “spray-dried” aerosol. In general, the potential for this problem is greatest when the scrubbing…

Particulate Matter Isokinetic Sampling

Much time and money are spent by field investigators trying to ensure that particulate sampling is conducted isokinetically; but with today’s tighter emission standards and better control equipment it might be worthwhile to consider just how important…

Wet ESP Corona Quenching Effect

Operators of wet electrostatic precipitators (wet ESPs) often notice that the secondary current and voltage readings tend to rise and fall with the particulate loading. This phenomenon is known as space charge corona quenching, and it can have a serious…