Two-stage flue gas desulfurization tower and ladder-level flow equalization and collection device thereof

Abstract

The invention relates to a two-stage flue gas desulfurization tower and a ladder-level flow equalization and collection device thereof. The ladder-level flow equalization and collection device comprises a girder which is arranged along a radial direction of a flue gas desulfurization tower and is used for dividing the cross-section of the flue gas desulphurization tower into a number of fan-shapedregions, a plurality of small sub-beams are arranged in each one of the fan-shaped regions in parallel at intervals, the heights of the tops of the small sub-beams are decreased step by step from inside to outside, each two adjacent small sub-beams in the same region are connected through a liquid collection plate, the liquid collection plate is provided with sieve pores for gas flow equalizationand inclined spray holes, the liquid collection plate at the outermost side is provided with a liquid falling tank and the liquid falling tank is communicated with a return port on the wall of the desulphurization tower. The flow equalization and collection device has a small absorption tower height space so that the lift of a circulating pump in the second absorption stage is greatly reduced andthe two-stage flue gas desulfurization tower only needs one absorption tower slurry tank.

Description

technical field [0001] The invention relates to a two-stage flue gas desulfurization tower and a stepped flow equalizing liquid collection device thereof, belonging to the field of flue gas desulfurization. Background technique [0002] At present, more than 80% of international and domestic flue gas desulfurization processes adopt limestone-gypsum wet desulfurization process, and flue gas limestone-gypsum wet desulfurization process generally adopts empty tower spray absorption tower, and the desulfurization efficiency is generally about 95%. However, with economic development, environmental protection requirements continue to increase. It is required that by 2020 my country's coal-fired power plant flue gas pollutant emission limit should meet the emission requirements of gas turbine units, which is the so-called "ultra-clean emission". ≤50mg / Nm 3 , SO 2 Concentration≤35mg / Nm 3 , soot concentration ≤ 10mg / Nm 3 . According to this new requirement, the actual desulfuriza...

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Problems solved by technology

However, when the flue gas passes through this device, most of the gas enters the upper spray layer through the gap between the water blocking and equalizing cap and the supporting part, and basically has no contact with the slurry above the effusion distributor, so the effusion distributor device It simply collects the upper spray layer slurry, and has no obvious strengthening effect on the gas-liquid two-phase mass transfer.

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