Method and device for active molecule pre-oxidation to absorb NOx and SO2 in coal-fired flue gas

A technology for oxidative absorption and coal-burning flue gas, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles, and can solve problems such as low efficiency, affecting removal efficiency, and high oxygen content

Active Publication Date: 2016-07-06
ZHEJIANG UNIV
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Problems solved by technology

However, calcium sulfite is an insoluble substance, even if the SO in the solution after adding additives 3 2- The concentration is still not high, and the oxygen content in the flue gas is high, which is easy to oxidize and affect the removal efficiency

Method used

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  • Method and device for active molecule pre-oxidation to absorb NOx and SO2 in coal-fired flue gas

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Embodiment Construction

[0027] The specific implementation of the present invention will be described below with reference to the accompanying drawings.

[0028] The air from the fan 2 enters the ozone generating device 4 through the air drying and purifying device 3. The oxygen in the air is generated by the ozone generating device 4, and the ozone is sent to the space between the electrostatic precipitator at the outlet of the boiler 1 and the scrubber 7 In the low temperature (110~150℃) tail flue 5, ozone is sprayed in a porous grid to strengthen the mixing of ozone and flue gas; the flue gas components in the tail flue 5 are mixed with ozone, and NO in the flue gas is oxidized by ozone at the same time The amount of ozone injected is based on the concentration of nitrogen oxides in the flue gas and the removal efficiency requirements according to the molar ratio of ozone to nitrogen oxides. O 3 / NO is 1 to 1.5 for dynamic adjustment to ensure an oxidation reaction time of at least 0.5 seconds. The fl...

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Abstract

The invention relates to the technical field of environmental protection and aims to provide a method and a device for pre-oxidizing and absorbing NOx and SO2 in coal-fired flue gas by active molecules. The method comprises the following steps: spraying ozone into a boiler tail flue of 100-150 DEG C, and enabling the ozone and NO in the flue gas to generate oxidation reaction; dynamically regulating the injection amount of the ozone according to a molar ratio of the ozone to the nitric oxides being 1-1.5, and ensuring at least 0.5-second oxidization reaction time; feeding the flue gas subjected to the ozone oxidization treatment into a washing tower to perform absorption treatment. According to the technical scheme adopted by the invention, the flue gas desulphurization rate can be over 99%, the denitration efficiency can be over 90%, the mercury removal efficiency can be over 80%, the dechlorination and defluorination efficiency can be over 95%, and the oxidative degradation of part of the volatile organic pollutants is realized.

Description

Technical field [0001] The invention relates to the technical field of environmental protection, in particular to a coal-fired flue gas combined with active molecule pre-oxidation to achieve NOx and SO 2 At the same time, the highly efficient catalyst and absorbent are suitable for exhaust gas purification of coal-fired boilers and various industrial kilns. Background technique [0002] In my country, various pollutants such as sulfur dioxide, nitrogen oxides, mercury, hydrogen chloride, volatile organic compounds, dioxins, etc., produced by the burning of a large amount of coal have become a major threat to serious environmental pollution problems. In order to control the problem of environmental pollution, the state has determined the emission reduction tasks of major pollutants during the "Twelfth Five-Year Plan" period. According to the latest version of the thermal power industry emission standards (ie GB13223-2011), the SO of coal-fired boilers in key areas 2 The emission s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/60
CPCY02A50/20
Inventor 王智化张彦威杨卫娟岑可法周志军刘建忠黄镇宇周俊虎程军
Owner ZHEJIANG UNIV
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