Custom Engineered Solutions

Pulse jet cleaning is a process developed by Porvair for the effective removal of collected solids from the surface of a filter element.

The process is typically undertaken whilst the filter is in operation, in situ, and apart from a very small pressure spike (or ‘overpressure'), it does not interrupt or interfere with the process flow.

The technique and its associated equipment can be designed to be used in high temperature, high solids, chemically aggressive and highly active environments, and over a wide range from vacuum condition to high pressure condition. This provides filtration down to very fine levels, with continuous operation and consistent pressure loss, allowing the accurate specification of complementary equipment around the filter.

Features and benefits

• 100% stainless steel 316L or Hastelloy® pleated high area sintered metal fibre filter media
• Reduced downtime for maintenance
• Excellent cleanability
• Optional clean in place
• Reduced energy cost
• Low pumping costs due to very low clean pressure drop
• Improves product recovery and process efficiency
• Environmental compliance benefits
• Repeatedly steam sterilisable
• Eliminates cross-contamination between batches and operator exposure
• Total pharmaceutical product compatibility.

* Standard 316L or alternative metallic media e.g. Hastelloy® and FeCrAlloy are available.

Applications

• This technique is widely used across a wide range of processes in areas as diverse as: 
• Fuel production, including fuel pellet grinding, furnace off-gas venting, powder transport and conversion oven/fluidised bed venting at temperature
• Power generation, including spent fuel and debris vault venting and protection and spent fuel drying processes
• Decommissioning, including mechanically generated dust collection, smoke removal, ceramic membrane crushing and cementation drum fill operations
• Waste deposition, including vitrification and waste solidification processes, drum filling and drum venting.

The pulsed jet filtration system has a track record of success in the following applications:

• Catalyst addition systems 
• Dryers
• Fluidised bed
• Fuel production
• Granulators
• Milling systems
• Mixers/blenders
• Pneumatic conveying systems
• Powder recovery and analysis systems
• Process gas
• Super-heated steam.

Porvair Filtration Group supplies true HEPA grade gas filtration, 99.97% at 0.3 microns, to meet the challenges of arduous conditions, including high temperature operation, up to 370°C in oxidising environments, chemically corrosive flows and high radioactivity situations, where conventional HEPAs would not be able to survive.

For high solids loads that would otherwise rapidly blind conventional HEPA inserts, Porvair Filtration Group supply Pulsed Jet, self-cleaning, HEPA grade systems that operate at a stabilised condition (a level of pressure loss which can be pre-determined by the user) whilst delivering the solids back to the user for disposal which would otherwise blind the filter.

Already in use in power stations in the UK and both fuel production and waste treatment facilities elsewhere, Porvair Filtration Group metal HEPA filters can be used in a wide range of varied applications. These include waste treatment and storage, post-Fukushima containment venting packages and ventilation systems, where the failure of conventional filter medium due to high differential pressure, and the presence of moisture, fire and explosion present an unacceptable risk to the public.