Sintered Metal Filter Working Principle

August 08, 2022

Filtration systems, utilizing sintered metal media for solids/liquid separation, have proven to be an effective and economical alternative to other separation methodologies, which may be vulnerable to pressure spikes, high temperatures, or corrosive environments.

These harsh environments, often demanding the use of continuous service, are ideally suited for all-metal filtration systems utilizing sintered metal media, which have been fabricated into tubular metal elements. Sintered metal media have demonstrated high particle efficiency removal, reliable filtration performance, effective backwash capability, and long on-stream service life in many industrial applications that typically utilize leaf filters, bag filters, and plate and frame filters.

Sintered metal media provide a positive barrier to downstream processes. Sintered metal can also be used to support finer filter membranes, precoated, or used as filter septum when they are coated with ion exchange resins. In addition to providing superior filtration in a single pass, clean-in-place backwashing reduces operator exposure to process materials and volatile emissions. While applications include sustained high temperature and corrosive environments, any pressure-driven filtration process with high operating costs has the potential for improvement using sintered metal filtration technology. Suitable applications are found in oil refineries, chemical and petrochemical processes, and pharmaceutical production facilities.

Porous Metal Tubes

Porous Metal Tubes


Principle Features And Properties Of Sintered Metal Filters

The development of specially designed and engineered sintered porous metal media, with a stable porous matrix, precise bubble point specifications, close thickness tolerances, and uniformity of permeability assure reliable filtration performance, effective backwash cleaning, and long on-stream service life. These well-controlled pores are essential to ensure effective particulate removal from process streams, coupled with subsequent particle removal during a backwash process. The particulate matter may be an undesirable contaminate, the desired product of the chemical process, or a reusable catalyst. Removal of the particulate matter may improve the quality (value) of the downstream liquid stream or aid in the subsequent processing of a waste stream.

The permanent structure of sintered metal media allows filter cartridges to be cleaned in several ways with no media migration.The appropriate selection of alloy type for corrosion resistance, and media grade for particle removal, assure liquid purity during separation. In-situ cleaning in process filters is by liquid or gas backwash. Chemical cleaning with compatible materials or ultrasonic cleaning in a detergent solution will remove insoluble contaminants from the filter. Sintered metal media are available in a wide variety of corrosion-resistant alloys including: Stainless Steel 316 L, 304L, 310, 347, and 430; Hastelloy® B, B-2, C-22, C276, N and X; Inconel® 600, 625, and 690; Monel® 400; Nickel 200; Alloy 20; Titanium.

Sintered metal media are offered in grades 0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 40 and 100. Sintered porous metal offers a temperature range of 750 to 1750°F depending on alloy material and atmospheric conditions.

Filtration Principle

Sintered metal filters are high efficiency, two-dimensional, straining type with particulate being collected on the media surface. The proper selection of media grade must balance the needs of the filtration application regarding particle retention, pressure drop and backwash ability. There are basically three process factors to consider: fluid velocity through the filter media, fluid viscosity and particle characteristics. The important particle characteristics are particle shape, size and density. Particles that are hard, regular shaped and form incompressible cakes such as FCC catalyst are well suited for surface filtration.

Filtration operation is based on constant flow, increasing pressure drop until the terminal pressure drop is reached. Terminal conditions will be reached when the catalyst cake thickness increases to a point where the fluid flow pressure drop is at a maximum for a given flow and viscosity condition. The filter is then backwashed by pressurizing the filter with gas, then quickly opening the backwash discharge valve. This backwash procedure generates a momentary high reverse differential pressure, which effectively removes solids from the media surface. Reverse flows of clean liquid (filtrate) through the media assists in the removal of solids and flushes them out of the filter.

Sintered Porous Metal Filter Element

Sintered Porous Metal Filter Element

Filter System description And Operation

There are two methods of operating an inside-out filter: 

1) Static or barrier type filtration and 

2) Dynamic or crossflow filtration. 

The variations exist primarily in the method of backwash or blowdown, and secondarily in the method of feeding and concentrating. In the static/barrier method, solids are deposited on the wall of the tube and fluid passes through the wall as filtrate. Fluid flow is generally perpendicular to the element wall. The dynamic or crossflow method incorporates a fluid flow of circulating solution axially through the element of sufficient velocity to prevent significant solids accumulation. The resulting effect is to concentrate a dilute feed stream to high solids content and reduce pressure drop due to flow through the solids cake.

Filtration using sintered metal media uses three primary types of filter configurations for solid/liquid filtration: 

1) Outside-in filtration: traditional solid/liquid barrier separation occurs on the outer perimeter of a closed-end tubular filter element. 

2) Inside-out filtration: solid/liquid barrier separation occurs on

the inside of a closed-end tubular filter element. 

3) Inside-out (multimode) filtration: solid/liquid (barrier or crossflow) separation that occurs on the inside of open-ended tubular filter element. 


Your Irreplaceable Sintered Metal Tube Manufacturer in China

Jintai sintered metal tube is a type of filter elements that contains multi-layer cord meshes or metal powder by sintering. Jintai mainly manufactures sintered stainless-steel tubes, porous metal tubes, sintered bronze tubes, and so on.

Jintai sintered metal tube pays more attention to production trouble from precision, like an easily neglected bit chipping problem of the edge. Fortunately, our knowledgeable production workers resolved it with our innovative vacuum cleaner sintering equipment.

Additionally, every Jintai sintered metal tube is checked purely with bubble point test according to ISO 4003 as well as air permeability test according to ISO 4022, to make sure premium quality and also please your unique precision demand. Contact us now!