Large liquid-gas ratio multi-layer cascade dust and mist removal packed tower

Abstract

The invention relates to a large liquid-gas ratio multi-layer cascade dust and mist removal packed tower, comprising a tower body, supporting frames, packing layers, spray components and a settling tank, wherein the bottom of the tower body is fixed on the ground by means of a support, an exhaust port is formed on the top of the tower body, a liquid outlet is formed at the bottom of the tower body, and a gas inlet is formed at the lower end of the side wall of the tower body; the plurality of supporting frames are installed in the tower body up and down at intervals, and are positioned above the gas inlet; the plurality of packing layers are respectively laid at the upper parts of the supporting frames, and the diameters of packing in the plurality of packing layers are sequentially reduced from bottom to top; the spray components are respectively arranged above all the packing layers except the uppermost packing layer; a liquid discharge hole extends downwards into the settling tank. The large liquid-gas ratio multi-layer cascade dust and mist removal packed tower has the advantages that the purification of dust-containing flue gas is realized step by step by means of the multi-layer cascade packed tower; the lowest packing layer is used for coarse filtration, so that the resistance is small, and blockage is prevented; the middle packing layers are used for secondary filtration, so that inertia collision, interception and water film dust removal effects are enhanced; after the flue gas is filtered by means of the uppermost packing layer, dust-containing water mist is effectively removed, and ultra-clean discharge is realized.

Description

technical field [0001] The invention belongs to the technical field of high-temperature wet flue gas treatment, and in particular relates to a multi-layer cascaded dedusting and mist-removing packing tower with a large liquid-to-gas ratio. Background technique [0002] The wet dedusting technologies mainly include: spray tower, water bath deduster, sieve plate tower (foam tower), water film deduster, packing tower, venturi tube deduster, wet electrostatic precipitator. Spray towers, water bath dust collectors, sieve plate towers, and water film dust collectors have low efficiency and cannot meet the emission requirements; Venturi dust collectors have a large pressure loss, and the body is usually 5000-10000Pa. Due to high energy consumption, it is currently an obsolete technology. The wet electrostatic precipitator has a large investment, has problems of scaling and corrosion, and requires high levels of maintenance and management. [0003] In addition, in wet dust removal ...

AI Technical Summary

Problems solved by technology

[0006] 1) The pressure loss is high (1500-3000Pa), and the thickness of the packing layer usually exceeds 4m;

[0007] 2) The washing effect is poor, and the design value of the liquid-gas ratio is 1L / m 3 about;

[0008] 3) Single-layer single-size packing limits the further improvement of dust removal effect;

[0009] 4) Especially the dehydration effect on water mist discharge is poor, resulting in the discharge of fine dust dissolved in water mist

Although the packed tower can be combined with other dust collectors to improve efficiency, it leads to complex structure of the dust removal system, increased resistance, increased energy consumption, and increased investment

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