Home Full portfolio EDITUBE Wet Electrostatic Precipitator
The EDITUBE wet electrostatic precipitator (WESP) is a wet gas cleaning solution designed for removal of the finest fractions of dust particles and mist aerosols

Robust design with low maintenance requirements

Uniform gas distribution and high-power input for superior removal efficiency

Heated insulators without purge air addition to the process gas

Short installation time

Gas cleaning solution with superior removal efficiency

The wet electrostatic precipitator (WESP) is a wet gas cleaning solution designed for the removal of the finest fractions of dust particles and mist aerosols. The equipment comprises a bundle of tubes through which the gas flows vertically. A discharge electrode is placed in the center of each tube and with power supplied to the unit, an electric field is created around the discharge electrodes and a flow of electrons is achieved. As the gas passes through the tubes, particles and aerosols become electrically charged through collisions with the fast-moving electrons. Once charged, the particles and aerosols migrate through the electric field towards the tube wall where they are collected in a liquid film on the tube surface. The gas direction can be either top to bottom or bottom to top.

WESPs are a necessity prior to sulfuric acid plants processing metallurgical off-gas to ensure a high-quality acid but have also become increasingly common before stacks in non-sulfur applications with wet gas cleaning because of higher demands on low particle emissions. Metso EDITUBE WESP has a very high removal efficiency potential where dust levels in the outlet are commonly measured at below 0.5 mg/Nm3.


How it works

The tube bundle in each EDITUBE is enclosed in a casing. A gas distribution system inside the casing, before the tubes, ensures an efficient distribution of the gas in each tube. A uniformly spread gas is vital to ensure a high removal efficiency, which is heavily dependent upon retention time. The emission system, carrying the discharge electrodes, is free-hanging, with the upper frame connected through suspension rods to the insulators located on the top of the unit. The insulators are enclosed in hoods and kept dry by heating of the encapsulated air. The heated air acts as a cushion, protecting the hoods from the process gas and eliminating the need for pressurized air. The free-hanging design of the EDITUBE electrode system effectively reduces the inherent forces that the electrodes are exposed to, thus greatly increasing their lifetime.

Our EDITUBE WESP is self-supported, with the Transformer Rectifier (T/R) unit and insulator hoods conveniently gathered on the top. Additionally, with the correct design considerations, it can even carry the gas inlet and outlet duct, as well as the relevant access platforms. With access ladders attached to the upper parts of the unit, EDITUBE requires no surrounding steel structure. 

Metso EDITUBE is equipped with a flushing system to clean the tubes from any build-ups. The flushing is performed once per shift and normally circulates the acid mist condensate having been removed from the process gas, thus consuming very small amounts of water. In some cases, when the process gas itself does not contain any or enough sulfuric acid aerosols, a second auxiliary water system is installed: the fogging system. Captured aerosols form the liquid film flowing on the tube surfaces, which not only prevents re-entrainment of particles to the gas but also protects the material in plastic units. The fogging system is a spraying system, forming an artificial mist of aerosols that achieve the same effect.

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Digital solutions

With over 30 years of WESP experience, our experts have built a vast technical knowledge that allows them to continuously improve the design and performance of Metso EDITUBE. With increasingly automated and digitalized plants, new ways of transferring this knowledge to the products have become available. Now, more than ever before, we can provide a flexible WESP process section, where our units in real time adapt to changes in the process conditions, ably assisted by the Outotec expertise through our new digital optimizer for the EDITUBE WESP.

In addition to process optimization, Metso can also provide a pre-programmed control cabinet, EDITUBE Control Cabinet (ECC), for control of the auxiliary water systems, flushing and fogging, of the WESP section. Using a well-proven and rigorously tested control system reduces the amount of automation design and plant down-time. The ECC has a touch panel with individual control of each EDITUBE and corresponding auxiliary equipment.

Plug-and-play solution
Plug-and-play solution

Plug-and-play solution maximizes the fabrication, installation, and control logic implementation that can be done before arrival on site.

We can provide a WESP plant in its entirety, ready for CE-marking. Pumps, valves, tanks, piping, instrumentation and cabling are efficiently designed to minimize the overall footprint of the section. Combined with the self-supporting properties, the pre-programmed, optimized plant that does not require supporting steel structure is simply plugged into the gas duct.

The number of steps taken towards plug-and-play is decided in each case: the optimizer, PLC control of auxiliary equipment, prefabrication and programming can be tailored to the specific customer needs.

Service and inspection

At Metso, we care for the installed equipment throughout its lifetime. For this reason, we have developed a service package  with a holistic approach in which the equipment is inspected from a mechanical, electrical and process point of view. This maximizes equipment lifetime and increases availability.

Service and inspection


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