Method for preparing sulfuric acid by catalytically oxidizing low-concentration sulfur dioxide in baking flue gas

A sulfur dioxide, catalytic oxidation technology, applied in chemical instruments and methods, separation methods, inorganic chemistry and other directions, can solve the problems of high operation and maintenance costs, only a large number of stacking, and difficult wastewater treatment, and achieves a broad sales market and low production costs. , No secondary pollution effect

Inactive Publication Date: 2012-10-03
杨秋良
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Problems solved by technology

It is suitable for the flue gas desulfurization of large coal-fired power plants, but it has serious corrosion, difficult wastewater treatment, large initial investment, high operation and maintenance costs, and the production cost is about 950 yuan / ton for every ton of sulfur dioxide removed. The by-product gypsum, sales volume Limited, low added value, can only be stacked in large quantities, easy to cause secondary pollution

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  • Method for preparing sulfuric acid by catalytically oxidizing low-concentration sulfur dioxide in baking flue gas

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specific Embodiment

[0035] Specific examples: a vanadium pentoxide production plant with an annual output of 1,500 tons, the process of extracting vanadium is to use vanadium-containing stone coal as raw material, decarbonized by boiling roasting, vanadium is extracted by acid leaching of the decarbonized material, and the vanadium-containing stone coal is treated daily 400 tons, the average mass percentage of vanadium-containing stone coal sulfur content is 2.70%, and the removal rate of sulfur is 64.20%. Iron oxide can catalyze the oxidation of sulfur dioxide to sulfur trioxide at high temperature. The oxidation rate of sulfur dioxide is as high as 86.45%. The dust removal layer, the second, third, and fourth layers are filled with a 30cm thick wet electron exchange resin layer, and the fifth layer is a layer for installing a mist eliminator. The flue gas passes through the bottom of the spray absorption tower for spray cooling and dust removal. Before the cooling spray liquid is filtered, 5% h...

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Abstract

The invention relates to a method for preparing sulfuric acid by catalytically oxidizing low-concentration sulfur dioxide in baking flue gas. The method comprises the following steps of (1) introducing baking flue gas into a spray absorption tower, and spraying water onto the tower bottom of the spray absorption tower for dedusting and cooling to obtain a cooled spray liquid; (2) filling cooled and dedusted baking flue gas into a wet electron exchange resin layer loaded on the spray absorbing tower, oxidizing an electron exchange resin into an oxidization type resin with oxygen in the baking flue gas, reducing the oxidation type resin into a reduction type resin by using sulfur dioxide in the baking flue gas, oxidizing the sulfur dioxide into sulfur trioxide, and spraying with the spraying absorbing tower to obtain a dilute sulfuric acid; and (3) finally exhausting the baking flue gas out of an upper layer demister layer of the spray absorbing tower. The method has the beneficial effects that scaling and blocking are avoided; the desulfurizing efficiency is high; the investment is small; and nearly zero-cost running is realized, and great social benefit and economic benefit can be created.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method for preparing sulfuric acid by catalytically oxidizing low-concentration sulfur dioxide in roasting flue gas. Background technique [0002] Due to the rapid growth of my country's economy, the rapid growth of energy demand, and the large increase in coal consumption, the emission of sulfur dioxide has increased sharply. The annual emission of sulfur dioxide in my country has reached more than 20 million tons, mainly from coal-fired industrial boilers (especially thermal power plants). The second is the discharge of metallurgy and sulfuric acid industries. Due to the continuous increase of the total amount of sulfur dioxide, regional acid rain has not been effectively controlled. The acid rain area accounts for about one-third of the country's land area, and our country causes economic losses of more than 100 billion yuan every year. Sulfur dioxide pollut...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/50C01B17/74
Inventor 杨秋良
Owner 杨秋良
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