High-temperature air pollution control technology

Based on 35 years’ experience working for the environment, French company Maguin has developed the Cercat filter for high temperature air pollution control. David Gambier describes the technology and its potential use in the glassmaking industry.

Maguin has been present in the waste thermal treatment field since the 1970s, offering customers innovative and state-of-the-art concepts. The company’s knowhow has been built through the turnkey supply of thermal treatment units for different products such as liquid or industrial waste and more recently, meat and bone meal and tar and asphalt granulate.

To answer market demand and increasingly strict emission regulations for pollutants, Maguin has developed its own air pollution control equipment technology, comprising a reactor, a reagent storage and injection system, together with a filter or electrostatic precipitator (see Fig 1a and 1b). As an option, it is possible to add de-NOx equipment (SCR/SNCR) depending on the pollutant emission limits to be reached and the composition of gases to be treated.

Thanks to its global vision of energy recovery units and multiple skills, the company has designed an all-in-one air pollution control solution (Fig 1c), which improves the unit’s global performance. Named Cercat, this solution involves filtering the gases between 200°C and 400°C on ceramic candles at the outlet of the furnace/boiler or after an air/water cooling system. Neutralisation of the acid gases is carried out by adding reagent before the ceramic filter. Either lime or soda bicarbonate can be used for this purpose. For each case, a specific study is performed to determine which kind of reagent should be used depending on temperature, gas composition and treatment requirements. A heat exchanger installed at the filter outlet can optimise energy recovery.

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