Flue gas purifying method with recyclable alkali absorption liquid

A technology of flue gas purification and alkali absorption, which is applied in the field of flue gas purification, can solve the problems of high cost of lye and limited application, and achieve the effects of low operating cost, high cost and simple process

Inactive Publication Date: 2014-02-19
蒋克旭
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Problems solved by technology

However, using lye as an absorbent to desulfurize, denitrify and demercu

Method used

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Examples

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Example Embodiment

[0017] The specific implementation steps of the method for purifying flue gas with a recyclable alkali absorption solution of the present invention are:

[0018] (1) At 45-200℃, by adding atomized ozone to the flue gas, the insoluble nitrogen oxides (NO X ) Is converted into soluble nitrogen dioxide (NO 2 ). Ozone and NO X The molar ratio is 0.5 to 2.5:1. The reaction residence time is 1-10 seconds.

[0019] (2) The flue gas enters the absorption tower to absorb the pollutants in the flue gas with lye to obtain sodium sulfite, sodium sulfate and sodium nitrate solutions and absorption liquid containing heavy metal mercury deposits; the temperature of the absorption tower is 45℃~95℃, The volume ratio of the lye absorbent to the flue gas is 0.25 to 1:1000. The absorbing liquid is filtered, and the obtained precipitate containing heavy metal mercury is sent to the non-ferrous metal smelter for comprehensive utilization, and the valuable metal mercury is extracted. The filtrate is so...

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PUM

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Abstract

The invention discloses a flue gas purifying method with recyclable alkali absorption liquid, which comprises the following steps of adding atomized ozone into flue gas, and converting nitrogen oxide (NOX) in the flue gas into soluble nitrogen dioxide (NO2); removing SO2, NOX and mercury in the flue gas by adopting alkali liquid as absorption liquid in an absorption tower to obtain absorption liquid; performing solid-liquid separation on the absorption liquid to obtain a mercury-containing precipitate; performing air oxidation and solid-liquid separation on the filtrate to obtain sodium sulfate and sodium nitrate; preparing alkali liquid by taking sodium sulfate as a sodium element; returning the alkali liquid as absorption liquid to a flue gas absorption system for recycling. Since the method realizes recycling of the alkali liquid at the time of desulfurization, denitrification and mercury removal, the problems of high cost by using a great quantity of alkali liquid in current flue gas purification and secondary pollution caused by waste liquid discharge are solved. The method disclosed by the invention has the advantages of simple process, small investment, low operation cost and high pollutant removal rate, the SO2 removal rate exceeds 95%, the NOX removal rate exceeds 80%, and the waste is fully used.

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 recyclable alkali absorption liquid when removing pollutants in the flue gas. 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 i...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/60B01D53/64
CPCY02A50/20
Inventor 蒋克旭
Owner 蒋克旭
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