Novel sodium-method desulfurizing tower

Abstract

The invention discloses a novel sodium-method desulfurizing tower, comprising an absorption tower, a NaOH storage tank and an end product decrystallization or biological treatment system; the bottom of the absorption is provided with an oxidation slurry tank, the middle part thereof is a liquid-gas contact zone, the upper part thereof is a spraying zone, a suction inlet at the bottom of the oxidation slurry tank is connected with the spraying zone through a slurry circulating pump, NaOH absorbing agent is stored in the NaOH storage tank which is connected with the inlet of the slurry circulating pump by a transfer pump, the oxidation slurry tank is connected with the end product decrystallization or biological treatment system by a discharge pump and the absorption tower is provided with a raw flue gas inlet and a clean flue gas outlet. The novel sodium-method desulfurizing tower of the invention has high desulfurizing efficiency and low consumption of absorbing agent. The desulfurizing tower does not need a complex slurry preparation system and has relatively small volume, thus reducing occupy space and equipment investment. The problems of blockage, scale formation and the like, which often occur in the gypsum method, are not likely to happen. The end product is Na2SO4, which can make up for the supply deficiency in the domestic market.

Description

【Technical field】 [0001] The invention relates to the field of environmental protection, in particular to a sodium method desulfurization tower. 【technical background】 [0002] At present, the flue gas desulfurization method of coal-fired power plants popular in the domestic and international markets is the limestone gypsum wet desulfurization process. The end product is gypsum. [0003] This limestone gypsum wet desulfurization process is currently the most widely used flue gas desulfurization technology in China. This technology was invented by European and American countries and has been widely used in Japan. One of its technical characteristics is that the produced by-product - gypsum can be effectively utilized and produce good economic benefits. [0004] However, judging from the current situation in China, due to the abundant reserves of natural gypsum in China, the purity of gypsum produced by the limestone gypsum wet process is affected by factors such as dust in ...

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Problems solved by technology

[0004] However, judging from the current situation in China, due to the abundant reserves of natural gypsum in China, the purity of gypsum produced by the limestone gypsum wet process is affected by factors such as dust in the flue gas, and domestic power plants only use limestone gypsum wet process for desulfurization. technology, leading to the increasing domestic desulfurization gypsum, exceeding the actual domestic demand, resulting in solid waste pollution

Moreover, the desulfurization efficiency of the limestone gypsum wet process is low, and the consumption of absorbent is large

A complex slurry preparation system is required, and the absorption tower requires high investment and a large floor area

The product is easy to cause problems such as clogging and scaling

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