Spiral groove demisting and dedusting device and method capable of preventing secondary carrying

Abstract

The invention discloses a spiral groove demisting and dedusting device and method capable of preventing secondary carrying. The device comprises an outer barrel, a screen barrel and a center barrel which are sequentially arranged at intervals in a sleeving mode from outside to inside. The lower peripheral wall of the screen cylinder is a non-porous section, and the upper peripheral wall of the screen cylinder is a screen hole section; a plurality of stages of strip-shaped spiral plates are arranged in the sieve pore section at intervals from top to bottom; except the last stage of strip-shaped spiral plate, washing nozzle mechanisms are arranged above the rest stages of strip-shaped spiral plates; the washing nozzle mechanism is connected with an external water source through a flushing water pipe; and water for washing the nozzle mechanism wets a spiral blade of the strip-shaped spiral plate and forms a liquid film on the surface of the spiral blade. According to the invention, the screen barrel can thoroughly separate the flue gas flowing area from the liquid film adsorption area, and the flue gas cannot flow between the screen barrel and the outer barrel due to the water seal effect of the water collecting tank at the lower part of the liquid film adsorption area, so that the secondary carrying problem of the flue gas is fundamentally solved, and the demisting and dedusting efficiency is improved.

Description

technical field [0001] The invention relates to a flue gas treatment device and a chimney swirling demist and dust removal process, in particular to a spiral groove demist and dust removal device and method for preventing secondary carryover. Background technique [0002] In recent years, with the rapid development of industry, air pollution has become increasingly serious, among which SO 2 And fine particulate matter is the main air pollutant produced by fossil fuel combustion. [0003] According to statistics, 90% of thermal power units use limestone-gypsum wet desulfurization. Limestone-gypsum wet desulfurization has also been adopted in metallurgy, petrochemical, building materials and ship power. The flue gas after desulfurization will contain a large number of dust particles and slurry droplets with different particle sizes. If it is directly discharged into the atmosphere, it will form a phenomenon of "gypsum rain" in the surrounding area, causing secondary pollutio...

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Problems solved by technology

[0008] The invention separates the flue gas flow area from the liquid film of the outer cylinder wall through the screen cylinder to form two different areas, which completely prevents the secondary carryover caused by the high-speed smoke flowing through the liquid film and tearing the liquid film, and fundamentally solves the problem. The problem of secondary carryover; by arranging all-round flushing nozzles, a continuous and stable liquid film is formed on the surface of the strip-shaped spiral plate, which solves the problem of poor film formation, low dust removal efficiency, and dust particles sticking to the surface of the swirl plate in actual engineering applications The problem of scaling and clogging; the accumulated water is collected through the sump, and the water is automatically drained, which completely solves the problem of water balance

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