Catalytic gas cleaning
Catalytic ceramic candle filter (BisCat)
Hot gas filtration with ceramic candles. A multifunctional filter for the simultaneous removal of particulate, acid gases and NOx from flue gases.
BisCat ceramic filters with an embedded catalyst matrix allow the removal of particulates, acidic gases, dioxins, mercury, VOC and NOx. The filter elements are chemically inert and corrosion resistant.
Gas cleaning in one step. In addition to treating particulate and acidic gases like in a conventional candle filter, the BisCat ceramic catalyst filters are enriched with a catalyst, providing effective NOx removal by using upfront ammonia injection and replacing a conventional selective catalyst reactor (SCR).
The BisCat filter solution is combining three process steps in one unit for advanced emission control:
- Dedusting
- Removal of acid components
- Reducing unburned hydrocarbon (THC) and NOx
The ceramic filter elements show very low dust emissions (< 2 mg/Nm3) and are thermally stable under high operating temperatures. No cooling of flue gases are required and no thermal heat energy is wasted when implementing them.
Filter elements are cleaned online during operation through separate, compressed air jet pulses. The filter elements are placed in a single or multi-compartment housing to handle large volumetric flow rates. This construction technique allows for maintenance of a single module while others continue to operate, without interrupting the process altogether.
The injection of lime-based reagents allows for control of inorganic gaseous emissions like HF, HCl, and SOx. The rigid candle structure enables surface filtration and forms a first layer of reactive dust for absorption processes.
Main Benefits
- Low differential pressure
- Dust monitoring system (Broken Bag Detector) allows for safe
- operation with almost zero dust emission
- Low a/c ratio allows n-1 operation for longer periods
- Baffle plates protect candles from direct gas flow intake in raw gas compartment
- Clean gas dampers are designed for low differential pressure
- Short candle installation sequence, due to easy and fast candle piece assembly
- Penthouse equipped with lifting devices to handle candles and clean gas compartment covers
- Long service lifetime
Downloads
GEA Insights
GEA reports profitable growth for 2025 and expects accelerated revenue growth
GEA’s past fiscal year was one of significant growth and further profitability gains. In particular, the technology group substantially increased order intake, with all divisions contributing here. GEA also made progress in all Mission 30 strategic growth areas. In addition, GEA met key interim targets under its climate plan ahead of schedule. Major milestones in fiscal year 2025 were admission to the DAX index, the award of one of the largest contracts in the company’s history, and streamlining of the corporate structure.
How SmartParc is rewriting the rules of food production
Thanks to a new SmartParc manufacturing site, food processors in the U.K. are cutting their running costs and emissions. With GEA heating and cooling technology at its core, this collaborative production model demonstrates how innovation is accelerating the industry’s net-zero ambitions.
The food science playground
“Brewing eggs is like brewing beer.” It’s the kind of comparison that makes you smile – and then it clicks: Something complex suddenly feels simple. Through this personal film, set in the agricultural heartland of the U.S., we explore precision fermentation and the real-world work it takes to turn an idea into food.
