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Coalescence Separation Oil Filter

May 24,2017.

Coalescing filter elements use multi-layer composite structure of the filter paper high precision. It can hold large pollutants with long service life, big flow density and small size.

The structure and materials of the coalescing filter are in accordance with the requirements of API-1581 and GJB610-88, which can meet the needs of purification of diesel oil.

The coalescence separation filter is made of high density gradient glass fiber. In order to reduce the loss and loss of the coalescence, the filter element is designed as a monolithic structure. The surface of the filter element is treated by hydrophobic to meet various filtration precision requirements. Polyester fiber coalescence filter element material is usually made of polyester fiber synthetic material, with a variety of fluids have a good compatibility.

The coalescence separation filter is made of spiral with multi-layer structure. Each layer adopts different performance fiber, and the expected filtration precision is achieved by controlling the shape, size, thickness and density of each layer of fiber. Coalescence separation of the main use of the surface treatment of glass fiber or polyester fiber as a coalescence medium, filter structure through a special design, making the filter medium has good coalescence performance, filtration accuracy of up to 0.1μm.

The principle of collation filter is oil, water and other liquid droplets, caught by the internal microfiber of the coalescer. These micron-sized fibers form a twists and turns on the air flow, forcing the solid particles and liquid droplets to be trapped by the ultra fine fibers under the action of inertial collision, diffusion interception and direct interception of the three filtration mechanisms, and the liquid surface tension To form a larger droplet, due to gravity, large droplets sink to the bottom of the container.

The coalescence separation filter in the outer layer of pre-filter intercept solid impurities, the fluid from the inside out flow through the coalescing filter. The inner layer is the pre-filter coalescence filter, and the solid impurities are intercepted on the outer layer to block the pre-filter layer and prevent the agglomeration process.

The three interceptors of the coalescence filter act together to catch the droplets, and the droplets of oil, water and other liquids are captured by the ultra fine glass fibers inside the coalescer, which form a tortuous passage for the airflow, forcing Solid particles and liquid droplets collide on ultra fine fibers under the following three mechanisms.

Inertial collision, diffusion interception and direct interception are three mechanisms of gas filtration. Inertial collision is the change in the direction of fluid movement, the particles due to inertia and collision to the filter. For 2um and larger particles, their original trajectories are maintained due to their large mass and inertia, which impinges on the fibers. Diffusion interception in the gas to 0.2um below the particles is the main interceptor. As a result of Brownian motion, the particles diffuse from the airflow to the fiber surface of the Chongqing oil filter, adsorbed on the fiber under static electricity. For particles from 0.2um to 2um, it only works by direct interception. Direct interception refers to the interception when the particle diameter is greater than the fiber channel can’t pass. Direct interception is the most basic characteristic of the pore size distribution. The smaller the pore size, the higher the efficiency of direct interception and the higher the efficiency of removing the particles. In the gas, the removal efficiency of 0.3 um marks the filter performance level.

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