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KHAN MX™ Modular Self-cleaning Filtration System

  • Introduction
     
    MX™ series modular self-cleaning filter is a new type modular automatic filtration system developed by Khan. The filter elements could be added or reducted to organize self-cleaning filtration system according to filter flow and debris content. MX™ filter adapt to low viscosity liquid filtration, for example: raw water, sewage, solvent, gasoline, heavy coker gasoline, diesel oil, residual oil etc. MX™ filter

    can be used to purify fluid to meet the cleaness requirement of the next process; to protect downstream key equipments from shortening service life or lowering operation efficiency because of particle blocking, abrasion or scaling; and to collect backflushing drain liquid for recycling the high-value solid particles.

    MX™ filter operates automatically, no need labor for cleaning, space-saving, low differential pressure working, energy saving, adopts special high performance NOVO™ filter element, thoroughly backflushing, consume little back-flushing liquid. Traditional manual filter, after working for some time, the pressure loss rises because of debris blocking. In order to extending the filter dirt content and the corresponding working time, the filter area is enlarged and the spare filter is switched often to manually dismantle the filter. If the flashing filter element is not switched in time, the increasing differential pressure will press filter element and shorten its service life. Filter element may be damaged and influence final product quality and downstream key euipment operation.
     
     
    Working Principle
     
    When liquid passes through filter element, particles will be intercepted on the outer surface of NOVO™ filter element. The particle formed filter cake makes the differential pressure of filter element inlet and outlet increase. When differential pressure reaches the default value, the filter cake has become certain thick and the filter flow of filter element decreases. The controller starts backflushing, liquid moves from filter element inside to outside and removes the debris. Based on different backflushing liquid sources, backflushing method could be:

    Interal backflushing: the other filter element’s filter liquid back flow to flush the filter cake on NOVO™ outer surface. When backflushing, controller switches the need-to-backflushing filter element’s valve union (could be 2 ball valves or 1 three ball valves), namely shut off inlet valve and start drain valve. The other filter element, after filtration, part of the liquid back flow and backflush the filter element. The filter cake is removed quickly and discharged to drain pipeline.

    Shut off drain valve and start inlet valve, start to work as normal.

    Controller backflushes filter element one by one until finish all of them. When backflushing one of the filter elements, the others ate in normal operation.

    This backflushing method usually used in low viscosity, no valuable liquid, and big backflushing pressure environment. (namely system pressure bigger than 0.4MPa, may be influenced by viscosity.)

    External backflushing: use external connected clean fluid (liquid or gas) to remove filter cake on filter element surface. When backflushing, controller closes one of the filter element inlet & outlet valve and opens backflushing fluid inlet valve. Let in certain amount of fluid, quiclly open drain valve when backflushing pressure reaches backflushing fluid inlet pressure. The liquid/gas impulse is formed, quickly remove filter cake. Close backflushing fluid inlet valve and open inlet and outlet valve, back to normal operation.

    Controller backflushes filter element one by one until finish all of them. When backflushing one of the filter elements, the others are in normal operation.

    This backflushing method usually used in high viscosity, valuable liquid, and big backflushing pressure or small system pressure environment. (smaller 0.4MPa, may be influenced by viscosity.)

     

     
     
     
     
    Applications
     
    [Water Treatment]：different raw water, processing water, circulated cooling water;
    [Petrolchemical]：diesel oil, gasolene, naphtha, FCC slurry oil, VRDS Vacuum residue desulfurization, ARDS Atmospheric residue desulfurization, AGO atmospheric gas oil, CGO coker gas oil,VGO vacuum gas oil;
    [Other Liquid]：solvent, acid&alkali solution filtration.
     
     
    Characteristics and Adventages
     
    ♦ Continual to filtrate when automatic backflushing, no need stop system, save the cost and reduce operation cost
    ♦ Modular composition, add 1 filter element to be spare of whole filtration system, low risk of system stop, small investment
    ♦ Good extendability, filtration flow can be enlarged by adding several filter elements, can meet production expending and processing adjustment requirement
    ♦ Can use DCS(distributed control system) long-distance control to supervise and adjust system operation on real time
    ♦ Adopt NOVO™ high performance filter element, low pressure loss, high backflushing efficiency, super long service life, low maintenance cost
     
     
    High-performance NOVO™ Filter Element
     
    MX™ filter adopts high-performance NOVO™metal filter element. Filtration precision 30-1500 micron, The surface is spiral type seam and pores are displayed equially, filtration effect is stable and high-efficient. Filter element surface is smooth, prevent particle blocking. High backflushing efficient, good for wax, asphalt, microfiber filtration. Integrity structure, high intension, high positive and counter pressure resistance, super long service life.
     
    MX™ filtration assembly adopts narrow thread, small diameter NOVO™metal filter element. Multi-thread assembly, enlarges filtration area, reduces ocupied space and raises filter element surface porosity. The standard assembly is 3 threads(E3), 7 threads(E7), 19 threads(E19) or 37 threads(E37), the responding filtration area is 0.15m2, 0.36m2, 0.98m2, and1.91m2, each of them can be dismantled and replaced, saving spare part replacinging cost.
     
     
     
    Precision Conversion Table Mesh count(Mesh)　 500 300 200 150 120 100 75 60 50 40 30
    Micron(μm) 30 50 75 100 125 150 200 250 300 375 500
     
     
     
    Technical Parameters
     
    *Filration Precision(μm) 30 - 1500
    Max.Working Temp.(C°) -40 - 230
    *Working pressure(MPa) 1.0
    Working mode manual or automatic
    *Recommend cleaning DP (MPa) 0.5 - 0.1
    Source gas pressure requirement 0.4MPa
    Control box voltage 220V AC
    Explosion proof Optional
     
    *Fliter presision：initial precision, after forming filter cake can remove particles<30μm
    *Recommend cleaning DP：just for reference, depend on liquid and particle forms.
    *Max.Working pressure：standard working presure, higher presure can be ordered
     
    Selection Key Points - Filter element surface low flow rate advantages
    When liquid goes through filter element, solid particles will be intercepted on the surface and formed filter cake with micropores. This will help to raise dirt removing efficiency and extend filter element cleaning cycle. Low flow rate reduces the possibility of particles blocking in the pores due to high flow rate, it helps to form filter cake evenly and stablely. The ideal filter cake can increase dirt interception rate, and reduce backflushing frequency. When backflushing, dirt will be removed more easily. MX™ filter adopts large area filter assembly, it can reduce filter element surface flow rate efficiently, improve filter system performance.
     
    Surface flow rate design is different due to different filtration applications. Usually the flow rate should be lower in high viscosity heavy charge liquid filtration; and the flow rate should be higher in low viscosity liquid filtration. Sunrise company has rich filtration experience to design optimized filter element surface flow rate to the client. 
     

     

 

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