Sodium-calcium wet desulphurization, circulation, regeneration and precipitation integral treatment device

Abstract

The invention discloses a sodium-calcium wet desulfurization, circulation, regeneration and precipitation integral treatment device, which comprises an induced draft fan, a desulfurization tower, a precipitation regeneration tank, a circulation tank, a plate-and-frame filter press, a process water tank, a sodium alkali tank and a lime slurry tank, wherein a partition plate is arranged between theprecipitation regeneration tank and the circulation tank; a slurry pipe is arranged at the bottom of the precipitation regeneration tank; the slurry pipe is connected with the plate-and-frame filter press, the plate-and-frame filter press is provided with a filtrate return pipeline, the filtrate return pipeline is connected with the circulation tank, the circulation tank is provided with a returnliquid pipeline, the return liquid pipeline is connected with the desulfurization tower, a lime slurry pipeline is arranged between the precipitation regeneration pool and the lime slurry tank, and asodium alkali pipeline is arranged between the circulation tank and the sodium alkali tank. In actual use, the defects of a limestone method are overcome, SO2 is absorbed by sodium alkali in the absorption tower, and the absorbed desulfurization liquid is regenerated by cheap lime in the regeneration tank, so that the problem of easy scaling in the tower of the lime method is solved, and the method has the advantage of high absorption efficiency of the sodium alkali method.

Description

technical field [0001] The invention relates to a flue gas desulfurization device, in particular to a sodium-calcium wet desulfurization, circulation, regeneration and sedimentation integrated treatment device. Background technique [0002] The traditional limestone-lime flue gas desulfurization process uses calcium-based desulfurizers to absorb sulfur dioxide, and calcium-based desulfurizers react with sulfur dioxide to form calcium sulfite and calcium sulfate. Fouling in the desulfurization tower and pipes, causing blockage. Scaling and clogging seriously affect the normal operation of the desulfurization system, and even seriously affect the normal operation of the boiler system. In order to avoid the unfavorable factors brought by calcium-based desulfurizers, most calcium-based desulfurization processes need to be equipped with corresponding forced oxidation systems (aeration systems), which increases initial investment and operating costs. The use of cheap calcium-bas...

AI Technical Summary

Problems solved by technology

On the other hand, under the same liquid-gas ratio, the desulfurization efficiency of calcium-based desulfurization is lower than that of sodium-based desulfurization, and the removal rate of low-concentration sulfur dioxide is lower

In order to meet the emission standards of flue gas, currently calcium-based desulfurization is often operated with a large liquid-to-gas ratio, resulting in high comprehensive energy consumption and complex systems for calcium-based desulfurization

[0003] In addition to the problem of increased ash formation resistance of the mist eliminator, the current common treatment method is to blindly configure a more complex and efficient cleaning system for the mist eliminator, and frequently perform intermittent cleaning of the mist eliminator with process water

However, due to the online intermittent cleaning, one will cause fluctuations in the resistance of the flue gas system and affect the negative pressure of the furnace, and a large amount of flushing water entering the desulfurization liquid system will also affect the stability of the concentration of the desulfurization liquid. During the flushing process, it will cause a short-term serious phenomenon of water in the flue gas and shorten the service life of the mist eliminator, which does not fundamentally solve the problem of ash clogging of the mist eliminator

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