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Flue gas cleaning method capable of simultaneously desulfurizing and denitrifying

A flue gas purification, desulfurization and denitrification technology, applied in chemical instruments and methods, separation methods, air quality improvement and other directions, can solve the problems of limited application and high cost of lye, and achieve low operating cost, high removal rate and simple process. Effect

Inactive Publication Date: 2014-02-19
蒋克旭
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AI Technical Summary

Problems solved by technology

However, using lye as an absorbent to desulfurize and denitrify flue gas, the cost of using lye is high, which limits its application

Method used

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Experimental program
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Embodiment Construction

[0021] The flue gas purification method of simultaneous desulfurization and denitration of the present invention is:

[0022] First, atomized ozone is added to the dust-removed flue gas, and insoluble nitrogen oxides (NO x ) into soluble nitrogen dioxide (NO 2 ).

[0023] Next, the flue gas is sent to the absorption tower to absorb the pollutants in the flue gas with lye to obtain sodium sulfite, sodium sulfate and sodium nitrate solution absorption liquid; the absorption liquid is oxidized by air in the oxidation tower, and sodium sulfite is oxidized to sodium sulfate to obtain sulfuric acid Sodium and sodium nitrate solution are cooled to precipitate sodium sulfate; sodium sulfate is sent to the alkali making system to produce lye; sodium nitrate solution is evaporated and crystallized to obtain sodium nitrate product for sale.

[0024] Reuse the product sodium sulfate in the flue gas to make lye (NaOH), and the process steps for making lye (NaOH) are:

[0025] (1) earlie...

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PUM

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Abstract

The invention discloses a flue gas cleaning method capable of simultaneously desulfurizing and denitrifying. The method comprises the technical steps: adding atomized ozone into the flue gas to convert insoluble nitrogen oxides (NOx) in the flue gas into soluble nitrogen dioxide (NO2); then, absorbing and removing SO2 and NOx by alkali liquor in an absorption tower to obtain an absorption liquid, and oxidizing the absorption liquid with air to obtain sodium sulfate and sodium nitrate; preparing the alkali liquor by using sodium sulfate as a sodium element, and recycling the alkali liquor as the absorption liquid to a flue gas absorption system. The method recycles the alkali liquor while simultaneously desulfurizes and denitrifies, thereby solving the problem of high cost of a lot of alkali liquor used and secondary pollution caused by effluent discharge in existing flue gas cleaning. The method disclosed by the invention is simple in process, less in investment, low in operating cost and high in pollutant removal rate, and the removal rate of SO2 reaches over 95% and the removal rate of NOx reaches over 80%, so that wastes are fully utilized.

Description

1. Technical field [0001] The invention relates to the fields of air pollution control technology and resource utilization, in particular to a flue gas purification method for simultaneous desulfurization and denitrification. 2. Background technology [0002] At present, my country is carrying the largest population in the world with the most fragile ecological environment in history, carrying the most unprecedented resource consumption and economic activities in history, and facing the most prominent ecological environment challenge in history. The contradiction between population and resources, economic development and ecological environment has become the biggest constraint factor for China's modernization development. To maintain sustainable development, it is necessary to reduce environmental pollution and implement a circular economy. my country's current energy structure determines that the pattern of energy supply and consumption, which is still dominated by coal, w...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/96B01D53/60
CPCY02A50/20
Inventor 蒋克旭
Owner 蒋克旭
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