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07/03/2013
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Lindsay McRae, Pall Corporation, Lindsay_McRae@pall.com
Yes catalyst fines can be effectively removed from slurry oil from several thousands of ppmw to less than 100 ppmw using a filter equipped with sintered metal filter elements and a proprietary automatic backwash filter system from Pall Corporation. (www.pall.com)
However the operating temperature of 90-100 Deg C is far too low as asphaltenes will precipitate and filter regeneration will be inhibited resulting fouling that may require external chemical or ultrasonic cleaning.
So the backwash filter would need to be installed at an appropriate location within the RFCC unit where necessary utilities are located and the operating temperature is suitable. We have much experience supplying Slurry Oil filters to refineries with more than installations globally.
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21/04/2012
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Marun Dutta, Indian Oil Corporation Ltd, duttam@iocl.co.in
We used to operate a slurry backwash filtre by PALL, but currently it is in bypass mode as we pump our column bottom to Delayed coking unit (DCU)
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10/04/2012
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Victor Scalco, General Atomics Electromagnetic Systems (GA-EMS), Vic.Scalco@ga.com
The Gulftronic Separator http://www.ga-esi.com/gulftronic/index.php is ideal for the removal of catalysts especially from RFCC units (it is field proven at several refineries in Asia). Since the Gulftronic uses Electrostatic separation that employees the use of patented beads, it can remove catalyst fines well down into the sub-micro size that pass through mechanical filters. However, the minimum temperature is 160 Deg C. What are your options for raising the temperature?
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06/03/2012
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Prabhat Choudhary , IOCL, prabhatchoudhary26@gmail.com
We have slurry filter by PALL , filter within desired specs.Filter having mesh type elements inside. As far as operation two filters are there which runs alternatively as filtration and backwash mode on PLC operated valve logic. HCO is used as backwash media and finally this backwashed material along with catalyst fines returned to the riser.
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15/06/2011
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Niels van der Horst, Royal Dahlman BV, n.vanderhorst@dahlman.nl
Operating temperature is critical for the reliability of the filtration process; f.i. asphaltene precipitation on the filter media may occur when operating at too low temperatures, resulting in reduced cycle times and undesirable, ex-situ cleaning of the filter elements. In order to determine if there is a potential risk for this we suggest you perform on site testing. If you are experiencing difficulties with your filters now you have the chance to demonstrate and improve operation.
Malfunctioning filtration units can often put a strain on refiners profitability. Often operations are not even aware of the fact that they are losing large quantities of valuable backwash volume.
Refiners considering improved filtration technology in order to reduce product losses or to get a grip on their maintenance cost will make it possible to upgrade feeds and residues economically or to modify the product slate to meet current market requirements. Robust and proven filtration technologies are essential for meeting capacity and quality targets for processes such as thermal conversion, hydrocracking and fluidized catalytic cracking.
In order to familiarise you as a potential customer a test filter system has been designed for you to make it possible for easy industrial scale testing at your refinery.
Our mission is about helping you to fulfill your needs once you have decided to perform on site pilot testing, to reassure the tests will start on time and will continue to deliver the appropriate data.
Typically, Dahlman’s Slurry Oil Filter packages consists of 2 or 3 filter vessels (e.g. 2 x 100% or 3 x 50%), a backwash receiver vessel, a gas accumulator vessel and includes for all controls, valves, instruments and piping, assembled within one complete skid mounted unit.
High quality sintered porous metal filter elements are utilized as filter media and are installed in the filter vessels, in such a way that solids are retained on the inner surface of the elements. Clean filtrate passes through the solids “cake” and filter medium. Once the filter’s delta P has reached its pre-set value after normal filtration mode, the package its cleaning sequence is automatically started. The feed and filtered product connections are both closed and subsequently, the valve connecting a gas accumulator will open towards the FCC Slurry Oil filter vessel. This results in pressurization of the slurry oil contained in the filter vessel. When a quick-opening valve installed below the filter vessel opens, the gas pocket, pressurizing the FCC SO from above, rapidly expands. This results in a reverse flow of the slurry oil, from the outside to the inside of the filter elements. As a consequence, the collected particles/filter cake, dislodges over the entire surface of the filter tubes. The filtered liquid is even forced further back by the expanding gas, transferring the separated solids to the backwash receiver vessel in a matter of seconds.
Dahlman’s gas-assisted backwash technology eliminates channeling and incomplete cleaning.
With Dahlman’s filtration technology, the sludge, disposed in the backwash receiver vessel, can be re- directed to the riser, while maintaining a continuous flow rate.
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15/06/2011
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Alan Goelzer, Jacobs Consultancy, alan.goelzer@jacobs.com
Successful Filtration of FCC Slurry Oil or FCC Slurry Oil + Heavy Cycle Oil requires a careful evaluation of the particular FCC/RFCC operation and FCC main fractionator. Successful Filtration is defined as getting close to Inorganic Ash = < 50 wppm in the filtered FCC Slurry Oil.
Certain degree of flexibility and controllability is needed with respect to filtration temperature and oil pressure; and backwash systems must be well conceived.
Two of the more commonly encountered filtration modules models are Pall Rigimesh and Filtrex ACR. These must be incorporated into a well conceived and well engineered and controllable SYSTEM.
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14/06/2011
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keith bowers, B and B Consulting, kebowers47@gmail.com
The key details in choosing the better method for removing solids from liquids are:
Temperature, viscosity at filtering temperature, presence of ''tars or other polymeric materials, maximum particle size desired in filtered liquid, particle size distribution, particle loading--how much, liquid flow rate, pressure available, pressure drop available, disposal of filtered solids--how--slurry, dry,etc.,.
Clean RCCU 'slurry' has been successfully produced. One attractive method is to use external third stage cyclones to remove more of the catalyst fines entrained in the feed to the fractionator-thus reducing the particle size and loading in the slurry substantially and reducing fouling in the fractionator.
Removing the particles by filtration has also been successful. Properly sized slurry cyclones have also performed as predicted. The choice of which method depends heavily on the particular factors of your situation.
Low capital cost disposable cartridge filters do work well---but cartridge replacement costs (labor and materials) can be expensive if solids loadings are high and waste disposal costs can be significant as well.
Automatic back-wash filters also perform well if properly sized and operated. The cost of back-wash liquid downgrade (to delayed coker feed) has to be considered. Several types of automatic back-wash/self cleaning filters are available.
Liquid-solid cyclones work well if properly designed and operated. They must be operated at or above 'design' flow rates to achieve design separation results. Solids removal efficiency decays dramatically if flow rated decrease. Substantial pressure drop across the cyclones is needed and the cost of pumping energy and equipment should be carefully considered.
Hiring a qualified consult to perform this evaluation is money well spent. Many factors need to be considered in performing the evaluations if you are to achieve a viable installation. The usual result from not engaging a qualified expert in this field is an installation that will not work at all or miserably fails to meet your objectives, and is costly to maintain.
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