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Device and method of simultaneous desulfuration and denitration for flue gas using ozone oxygenation combined with double-tower washing

An ozone oxidation, desulfurization and denitrification technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of high operating cost, single function, low value of by-products, etc., to achieve stable pressure and ensure atomization effect. Effect

Active Publication Date: 2009-07-22
ZHEJIANG UNIV +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a simultaneous desulfurization and denitrification of flue gas from coal-fired boilers with ozone oxidation combined with double-tower washing in view of the characteristics of single function, large investment, high operating cost and low value of by-products of various flue gas desulfurization and denitrification technologies at present. device, a further object of the present invention is to provide a method based on the device

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  • Device and method of simultaneous desulfuration and denitration for flue gas using ozone oxygenation combined with double-tower washing

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[0028] The invention is aimed at the generation of ozone by local air or oxygen discharge, which is respectively sprayed into the liquid phase area of ​​the first washing tower and the flue gas pipeline before entering the second washing tower, so as to realize the oxidation of tetravalent sulfur ions in the liquid phase and monoxide in the gas phase. Nitrogen is oxidized separately, and then desulfurization and denitrification are carried out in two wet scrubbers. If a wet desulfurization device has been installed, it can be effectively transformed to achieve simultaneous desulfurization and denitrification.

[0029] o 3 As a kind of free radical, it widely exists in electron beam and pulsed plasma discharge, and O 3 The life cycle is relatively long, so a small amount of air or oxygen can be ionized first to generate O 3 , and then send it to the removal device, which can greatly reduce the power consumption of the system. It is estimated that O 3 Only about 6% of the tota...

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Abstract

The invention relates to a technique for processing flue gas of a coal burning boiler, and aims to provide a device and a method for desulfurizing and denitrating the flue gas of the coal burning boiler by using ozone oxidation and double tower washing. The device comprises a flue which is connected with a heat exchanger, an alkali liquor washing tower A, and an alkali liquor washing tower B in sequence, wherein the insides of the alkali liquor washing tower A and the alkali liquor washing tower B are provided with a circular spraying device A and a circular spraying device B respectively; and an ozone generator is connected with a lower liquid phase area of the alkali liquor washing tower A and a pipeline in front of the circular spraying device B respectively. The novel method for desulfurizing and denitrating the flue gas of the coal burning boiler by using ozone oxidation and double tower washing can achieve the denitration efficiency of more than 80 percent and desulfurization efficiency of more than 95 percent, and realize the reclaiming and reusing denitrated and desulfurized products in different devices respectively.

Description

technical field [0001] The invention relates to a coal-fired boiler flue gas treatment technology, in particular to a device and method for simultaneous desulfurization and denitrification of coal-fired boiler flue gas by combining ozone oxidation with double-tower washing. Background technique [0002] Sulfur oxides and nitrogen oxides produced during the combustion of fossil fuels have caused increasingly serious harm to my country's atmospheric environment. The current desulfurization technologies for combustion systems can be divided into three categories: dry, semi-dry and wet. Among them, dry and semi-dry methods have low investment and operation costs, but often have low desulfurization efficiency. If dry and semi-dry desulfurization technologies are used, the discharge of sulfur and oxygen compounds from large boiler combustion equipment such as power plant boilers often cannot meet environmental protection requirements. The high-efficiency desulfurization device wi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/60
Inventor 王智化白云峰岑可法周俊虎吴树志周志军李永旺程军张明杨卫娟马志刚刘建忠黄镇宇
Owner ZHEJIANG UNIV
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