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Coal-fired flue gas denitration and desulfurization method combined with urea wet method

A coal-fired flue gas, desulfurization and denitrification technology, applied in separation methods, chemical instruments and methods, air quality improvement, etc., can solve the problem of low oxidation degree, achieve the effects of no secondary pollution, convenient transportation, and good technical performance

Active Publication Date: 2010-05-19
GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the defects of the prior art, the present invention aims at NO in flue gas X To solve the problem of low oxidation degree, by increasing the oxidation degree, the denitrification rate of the urea combined desulfurization and denitrification process is improved, thus a method of urea wet process combined with desulfurization and denitrification of coal-fired flue gas is proposed

Method used

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  • Coal-fired flue gas denitration and desulfurization method combined with urea wet method
  • Coal-fired flue gas denitration and desulfurization method combined with urea wet method

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Embodiment 1

[0029] Embodiment 1, spray into the hydrogen peroxide (H 2 o 2 ), keep H 2 o 2 / NO molar ratio 2~3, oxidize NO in coal-fired flue gas to NO 2 , so that NO X The oxidation degree is increased to 60%, and then the urea aqueous solution in the absorption tower is used for simultaneous desulfurization and denitrification. The concentration of urea aqueous solution is kept at 10%-20% (mass percentage), and the liquid-gas ratio is 9-12L / m 3 , The temperature is controlled at 80-90°C, and the pH value is controlled at 6.5-7. Its desulfurization efficiency can reach more than 90%, and its denitrification efficiency can reach about 50%.

Embodiment 2

[0030] Embodiment 2 is basically the same as Embodiment 1, the difference is: make NO X The degree of oxidation is increased to 50%.

Embodiment 3

[0031] Embodiment 3 is basically the same as Embodiment 1, the difference is: make NO X The degree of oxidation is increased to 50%.

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Abstract

The invention discloses a coal-fired flue gas denitration and desulfurization method combined with the urea wet method. The method comprises the following steps: spraying 50wt% of hydrogen peroxide at the coal-fired flue gas inlet of a absorption tower while keeping the molar ratio of H2O2 to NO to be 2-3, so as to oxidize NO in the coal-fired flue gas to NO2 and increase the oxidization degree of NOX; and perform denitration and desulfurization simultaneously by using the urea aqueous solution in the absorption tower. The method of the invention increases the denitration rate of the coal-fired flue gas denitration and desulfurization combination technology by increasing the oxidization degree of NOX and the temperature of the absorption solution. The method has simple technology, convenient operation and management, no secondary pollution and good environmental and economic benefits.

Description

technical field [0001] The invention relates to a method for combined desulfurization and denitrification of coal-fired flue gas, in particular to a method for combined desulfurization and denitrification of coal-fired flue gas with urea wet method. technical background [0002] my country's energy structure is dominated by coal, and SO in coal-fired flue gas 2 and NO X It is the main source of air pollutants, which not only brings serious harm to the ecological environment, but also causes a series of environmental problems such as acid rain. Therefore, under the current situation of limited national power, it is urgent to vigorously develop low-cost coal-fired pollution prevention and control technologies. While removing SO 2 and NO X It has the advantages of simple equipment, convenient management and operation, small floor space, and low investment and operation costs. It is a coal-fired pollution control technology in line with my country's national conditions and h...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/60F23J15/04
CPCY02A50/20
Inventor 杨柳乔慧萍
Owner GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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