Product Describe
Developing de-dusting hot gases is of increasing importance and interest, especially in advanced power generation systems and (petro-)chemical processes. High-temperature de-dusting has the advantages of exceeding dew points, enhancing energy recovery at higher temperatures, protecting the downstream heat recovery equipment from fouling or erosion, and potentially simplifying the overall process. Additional benefits are reduced porous metal filter consumption and the possibility to simultaneously capture gaseous pollutants (SO2, HCl) by the gas-solid reaction with injected alkali or by integrating catalysts to abate NOx VOC (volatile organic compounds) and PCDD/F (polychlorinated dioxins and furans). Both porous ceramic and metal filters have been proposed, with a growing preference for rigid metal filters. Either surface or depth filters are applied.
The operation parameters of hot gas de-dusting by rigid porous metal filters include the applied face velocity, the porosity of the filter fleece, its construction and the pulse jet cleaning performance. These parameters will be integrated into the design equations to determine the operating pressure drop and filtration efficiency for a given gas flow rate, operating temperature, dust characteristics and pulse jet cleaning mode.
The filters' broad range of potential applications before an energy recovery stage will be illustrated for petrochemical/chemical processes and combustion and gasification.
• Shape/stability, i.e. self, supporting structural elements suitable for high differences
• Excellent properties when under compression, vibration, and changing conditions or with high sudden pressures peaks
• High heat resistance and thermal stability
• Determined permeability and filtration performance because the pore size and distribution are accurate and uniform
• Backflushing and easy cleaning with superheated steam, chemical solvents, thermal processes, or ultrasonically
• The various materials used can be welded and processed
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