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Fiber bed mist eliminator, Mist Eliminator HANGING FIBER BED, Candle Mist eliminatorOne of the new directions in the production of filtering equipment is the cartridge mist eliminators launched by us into mass production (Fiber bed mist eliminator, Mist Eliminator HANGING FIBER BED, Candle Mist eliminator). The purpose of filter mist eliminators is to remove mist from an air or gas stream using the Brownian Structurally, mist eliminators consist of two coaxially cylindrical grids welded to the bottom and inlet flange. Frame material: stainless steel AISI 316L. The space between the grids is filled with fiber, the bottom of the element is equipped with a tube immersed in a water seal, from which the trapped liquid flows into the body of the apparatus. On the base plate of the column, the mist eliminators are fixed through the P.T.F.E gasket with studs and nuts. Depending on the performance of the installations, from 1 to 50-70 elements can be mounted in one body of the device. At existing sulfuric acid plants, such elements are often installed in a separate building, and in new shops - in the upper parts of absorbers (with a capacity of up to 170 thousand м3/ч). Fiber mist filters are divided into two types: - low-velocity (ʊ ≤ 0.2 m/s), equipped with fibers with a diameter of 5-20 microns and designed to capture submicron particles due to Brownian diffusion and the entanglement effect; their efficiency increases with a decrease in filtration rate, particle size and fiber diameter; - high-velocity (ʊ ≤ 0.5 + 1.2 m/s) with a layer of coarse fibers with a diameter of 20-100 µm, used to release gas from particles larger than 1 µm due to the mechanism of inertial settling, the efficiency of which increases with increasing particle size and speed filtration to a certain (critical) value (usually 1-2.5 m / s), at which the secondary spray of the trapped liquid begins from the layer in the form of large drops. Technical characteristics of mist eliminators:
ME FGM cartridge type low speed mist eliminators.
The main material of the filtering part used by us is a special chemical resistant glass fiber FGM 145 in the form of a multilayer needle-punched fabric resistant to concentrated and di-lute acids. In addition, other types of synthetic fibers may be used depending on the application. The hydraulic resistance of the mist eliminator is no more than 150 mm. water art. The efficiency of this type of mist eliminator can be reduced if there are insoluble organic, metallic or mineral particles in the working gas stream, which can enter the mist eliminator from the equipment installed before it. It can also be particles of sulfates or chemically formed salts, such as ammonium sulfate, ammonium nitrate, nitrosyl-sulfur Anhydride, nitrosyl pyrosulfate: - if there is any amount of HF gas or alkaline PH in the working flow, which cause corrosion for glass fiber and can destroy the filter part. - when the gas flow velocity exceeds 0.2 m/s. - at insignificant humidity of the purified gas. filter part effective when wet and, in addition to the density of the fibers, moisture forms "additional resistance" and the effect of Brownian diffusion. |
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