What is Hot Gas Filtration

Multiple industrial processes produce emissions, containing products which are hazardous to people’s health, or pollute the environment. Most countries have instituted regulations that limit these emissions, requiring these gasses to be filtered.

Since these gasses often reach several hundred degrees, conventional bag-type filters will fail quickly due to the high temperatures, leaving Ceramic Filtration as the only long term reliable option.

Particulate Matter often consists of fine particles (PM 2.5), which are extremely harmful to people. PM 2.5 is unfortunately able to pass through many conventional filters, with Ceramic Filtration offering the only reliable method of capturing.

Dry Gas Scrubbers are used in conjunction with Ceramic Filters to either adsorb or neutralise other harmful products, such as hydrogen chloride (HCl), sulphur dioxide (SO₂), hydrogen fluoride (HF), lead (Pb), mercury (Hg), and Dioxins.

How Does Hot Gas Filtration Work

Our filtration units work by drawing the flue gas through hollow ceramic filter elements, capturing particles on the filter wall. The structure of the filter elements is so fine, even PM 2.5 are captured.

The filtration unit is split into “dirty” and “clean” compartments, with the flue gas entering on the “dirty” side and particulate matter being captured on that side of the filter element. Clean air then passes from the filter element into the “clean side” and out to the stack.

The filter elements are periodically cleaned down with reverse pulse cleaning using compressed air, discharging the built-up particles to a collection bin

Dry Gas Scrubbing

Our filters we use are designed with gas scrubbing in mind, with our Filter Plants able to easily incorporate sodium bicarbonate and activated carbon. These are used to neutralise acid gasses such as HCL, HF, SO₂, and adsorb dioxins and heavy metals, such as mercury and lead.

Our filtration units are also designed for optimal performance of Sodium Bicarbonate for its effective range of 140°C to 450°C, while operating at higher velocities and thus there is no requirement for reaction towers or other ancillary equipment for effective dry scrubbing. Filters are modelled using CFD software to ensure even distribution and retention of the scrubber for optimal reaction.

An additional benefit of dry gas scrubbing at temperatures above 400° is that reformation of dioxins are prevented. This cannot be achieved by bag filters, which operate between 140°C to 260°C due to ignition risk of the media.


Designed and manufactured for low Emissions and high Reliability, achieving industry leading low emissions.

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Why Choose Us

Macroburn’s extensive experience with combatting all types of emissions has given us a unique perspective in filtration and filtration technologies. In order to strengthen our product offering and expertise, we have teamed up with Glosfume, a UK company that are the world leaders in hot gas filtration.Together we have the experience, expertise, and product offerings for a wide array of industry applications.

Macroburn provides three different filtration systems; our very high temperature MacroCeramic filters for up to 900°C, Glosfume filters for up to 450°C for the lowest emissions, and Glosfume biomass filters.

Standard filter sizes go up to 9800 Am³, but with all filters being modular units can be linked for extremely large processes. The modular units also allow for easier installation, lower transport costs, flexible installation footprint, high redundancy, and easy maintenance.

Saubatech has been specialising in filtration units for many years. For more information about the filtration process, our units or for advice to achieve your project goals, contact us today.