One of the many advantages is the high temperature resistance of the candle filters. While conventional bag filters with fabric media reach their limits at process temperatures of 260 °C, for hot-gas filters and their ceramic filter elements, even 500 °C is no problem.
Regeneration is performed based on the proven impulse cleaning system, which can be used to achieve extremely low differential pressures. Often, the temperature of the dust-laden exhaust gas is in the range between 300 °C and 500 °C, temperatures at which energy recovery is advisable. Thanks to the dust-free exhaust gas present here, more cost-effective and operationally safe heat exchangers can be used.
Encouraged by the success of the new hot-gas filter, Scheuch researchers are already working on how to develop the technology further to lower investment and running costs. The focus is on achieving the most compact design possible combined with a high level of operational safety. Branching off from that, the team is also working on new systems to reduce pollutants: For example, systems that combine filtration and catalytic denitrification in a single process step and increase the possible application temperatures to 1,000 °C.
Scheuch is the first company to introduce the hot-gas filter technology for the cement industry. This filtration process enables mercury to be separated out of the cement process. How it works: At high temperatures, mercury is still in the form of a gas and passes through the filter unimpeded. At the end, it is bound using an additive (such as activated carbon) and disposed of. The hot-gas filter technology is used in the glass and steel industry, as well as in biomass furnaces and waste incineration.

THE ADVANTAGES OF THE HOT-GAS FILTER AT A GLANCE:

• Efficient mercury reduction with xmercury
• Extremely low differential pressures
• Heat extraction at higher temperatures
• Cost-effective and operationally safe heat recovery
• Catalytic denitrification can be retrofitted at a later date