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New catalytic filter bag technology

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World Coal,

Haldor Topsoe and FLSmidth have agreed to work together to commercialise a new catalytic filter bag technology. The product will be known by the brand name EnviroTex™ catalytic filter bags and is capable of removing dust, volatile organic compounds and nitrogen oxides in one integrated and cost-effective process, according to a press release from Haldor Topsoe.

The new filter bags are the result of four years of development and comprise three layers of filter fabric. Each later contains a tailored catalyst optimised for the removal of specific kinds of compounds from the off-gas that passes through it.

“The three layer structure is unique,” explained Bjerne S. Clausen, CEO of Haldor Topsoe. “Not only because it provides the flexibility to tailor different catalytic combinations for different industries. It also makes it possible to handle the removal of several critical compounds in one integrated process. This can significantly reduce the cost of off-gas cleaning because today’s standard is to use separate stand-alone systems to address removal of specific compounds. This translates into complexity and higher customer operating cost.”

Fabric filters are used across a variety of different industries, including the power, biomass and cement industries. In many applications they are used as a final purification step to remove particulate matter from the flue gas.

“Initially we believe the US market will benefit from the product, because cement producers here are faced with immediate challenge in order to meet new regulatory requirements that have been issued by the US Environmental Protection Agency and will take effect 1 September 2015,” said Thomas Schulz, CEO of FLSmidth. “In the longer term, China may hold an even greater market potential as stricter emission legislation is also being imposed there.”

The new product will be manufactured at FLSmidth’s bag production facilities in Georgia, US. The filter bags will then be catalysed and assembled at Haldor Topsoe’s catalyst production site in Houston, Texas. This facility will be expanded with an entirely new production line dedicated to the production of EnviroTex™ catalytic filter bags. The goal is to complete construction of this facility by end-2015.

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