How does Backwash Efficiency Affect Your Catalyst Bed Protection Filtration System?

Filtration systems are generally regenerated through a backwash cleaning cycle. The primary factors effecting backwash efficiency are • Available pressure differential • Backwash flow • Filter media characteristics  

Available Pressure Differential:  During backwashing, the backwash differential pressure (between the backwash source and drain) should ideally be three to five times greater than the differential pressure across the dirty media.  In a feedstock filter, the maximum dirty differential pressure should not exceed 15 PSID, meaning the backwash liquid should be delivered at 45 – 75 PSID to maximize the cleaning efficiency.

Backwash Flow:
A sufficient flow rate of backwash liquid will also be required to regenerate the filtering media. The required flow rate will be primarily dependent upon the type of media selected. Sufficient backwash flow along with sufficient backwash pressure will lead to hydro-shock cleaning effect and completely regenerate the media to its clean differential pressure.

Filter Media Characteristics:
The final component of filter regeneration is the media characteristics. By their very design, slotted wedge wire and woven wire mesh allow particles to be captured on the surface of the media, providing optimum particle release and media regeneration.  Sintered metal is multi-layered and can offer higher per-cake efficiencies, but can be difficult to regenerate.  This leads to shorter run times and increased downtime.

In summary, feedstock filtration is an important aspect in efficiently refinery operation.  Protecting catalyst beds from particulate contamination prevents bed plugging and increases catalyst life. Several factors affect filtration system efficiency and should be carefully considered when selecting a feedstock filtration system.

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How to Remove the Hidden, Ongoing Costs of Disposable Media Filters in the Chemicals and Pharmaceuticals Processing Industries

The hidden, ongoing costs of disposable media are a cause for concern. Learn how you can achieve greater process efficiency, while bringing your costs down.

Liquid is a main ingredient in the processing of chemicals, and efficient and effective filtration can improve your bottom line! From industrial chemicals to polymer processing, fluid clarity and purity are essential in the pursuit of high-quality finished products.

Traditionally, chemical engineers have opted for disposable media filters such as bags or cartridges due to their lower initial cost. While initial cost may be lower for small batch operations, this is seldom true for continuous operations that require a costly, redundant filtration system – including piping, valves, support, and service connections – to maintain production.

Moreover, there are significant hidden costs associated with disposable media filters. When users purchase disposable media filters they often fail to account for the true costs of doing so.

Hidden costs:
To begin, there’s the ongoing disposable filter purchase price, which typically runs at least $3 per bag or cartridge per day, plus the ongoing cost of waste disposal.  For non-hazardous waste, disposal is already $400-$800 USD per drum, while that of hazardous waste is approaching $1,000 per drum. It’s not unusual for the typical pharmaceutical company or other fine-chemical based manufacturer to produce up to 20 drums per year of filter media for disposal, not counting the cost of treating or eliminating any run-off process fluids. Beyond this, there is significant labor costs involved with transporting, handling and storing disposable filter media, as well as with replacing it.

Example:
For just a small 30-gpm cartridge filter with six 10-inch cartridges, the operator must:
Remove 16 separate parts including the cover, compression seals, cartridges, and seal plates.

The operator must reassemble all 16 parts with proper alignment to ensure good seals. Then someone must haul away the spent filter media.  There’s also a housekeeping cost for cleaning any spillage from disposable media, along with increased emissions, safety risk, and liability. Then there’s the potential cost of disposable media rupturing or overflowing (as bags sometimes do), contaminating product or machinery downstream and slowing production. Finally, add the cost of buying, maintaining, and cleaning workers’ protective clothing for replacing disposable media. As well as the extra time and labor required to fill out MSDS forms and other paperwork required for items hauled to landfills or incinerators.

This is where Eaton’s automatic filtration and separation productscan make your operation more efficient, and most importantly improve the finished product quality. Eaton’s Automatic Self Cleaning Filters and Strainers assure continuous flow, simplified maintenance and worry-free operation.  The self cleaning product line includes tubular backwashing and mechanically cleaned technology. Eaton’s Model 2596 self cleaning strainer is available in custom designs and exotic materials upon request. Learn more at www.eaton.com/filtration

 

by Ask Filter Man