Boiler smoke gas multipollutant ozonization and simultaneous elimination device and method therefor

A technology for boiler flue gas and ozone oxidation, applied in chemical instruments and methods, separation methods, air quality improvement and other directions, can solve the problem of high energy consumption and achieve the effect of meeting environmental protection requirements

Inactive Publication Date: 2007-03-07
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a simultaneous removal device and method for ozone oxidation of multiple pol

Method used

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  • Boiler smoke gas multipollutant ozonization and simultaneous elimination device and method therefor
  • Boiler smoke gas multipollutant ozonization and simultaneous elimination device and method therefor

Examples

Experimental program
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Embodiment 1

[0026] As shown in Figure 1, the air or oxygen is sent to the ozone generator after drying and purification to prepare high-concentration ozone. According to the flue gas nitrogen oxide concentration and removal rate requirements, the molar ratio of ozone to nitrogen oxide is 1.1, and the reaction time is guaranteed to be at least 0.5s. The nozzle is sprayed with a porous grid, and the treated flue gas enters the lye washing tower after passing through the electrostatic precipitator, and the absorption liquid is recycled, and the flue gas is sent to the chimney for emission after wet washing and demisting. The washing tower uses lye as the absorbent, and the washing tower is a spray tower or a packed tower. The lye used as an absorbent is one or more of sodium hydroxide, potassium hydroxide, calcium hydroxide, calcium oxide, calcium carbonate or ammonia water, the lye is recycled, and the absorbed sulfate and nitrate are concentrated and crystallized , at the same time replen...

Embodiment 2

[0028] As shown in Figure 2, air or oxygen is fed into the ozone generator to prepare high-concentration ozone, and the ozone is sprayed into the low-dust flue at about 110 °C before the lye washing tower after the electrostatic precipitator. The amount of ozone injected is based on the nitrogen oxidation of the flue gas According to the concentration of pollutants and the removal rate requirements of various pollutants, dynamic adjustment is made according to the molar ratio of ozone to nitrogen oxides of 2.0, and the position of the injection point ensures that the flue gas has a residence time of more than 0.5s from the entrance of the scrubber. The injection adopts porous grid-shaped injection measurement to strengthen the mixing. The treated flue gas enters the lye washing tower for absorption. Air pollutants such as nitrogen oxides, sulfur oxides, mercury, chlorine, and fluorine can be efficiently absorbed, and the lye washing The lye used in the tower can be one or more ...

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PUM

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Abstract

The invention relates to a device for removing several pollutants of boiler smoke. Wherein, it comprises (1), before or after the static deduster of smoke channel, ejecting into ozone at low temperature section as 110-150Deg. C, while the ratio between ejected amount and nitrogen oxide is 1.1-2.0 and the reaction time is more then 0.5s; (3), feeding treated smoke into alkali washing tower to wash, and absorbing nitrogen oxide, sulfur oxide, mercury, chloride hydrogen, and hydrogen fluoride, adding H2S, Na2S, or NaHS into liquid grove to fix mercury. The invention can reach 80% denitrate efficiency and 95% desulfurizing efficiency, 80% demercuration efficiency, 95% antichloration defluorination efficiency, and oxidize the volatile organic pollutant.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a simultaneous removal device and method for ozone oxidation of multiple pollutants in boiler flue gas. Background technique [0002] The sulfur oxides and nitrogen oxides produced in the process of energy utilization have caused increasingly serious harm to my country's atmospheric environment. In addition, trace amounts of heavy metals such as mercury Hg, HCl, HF and volatile organic pollutants VOC have also increasingly caused harm. people's attention. At present, large-scale treatment and control of sulfur dioxide have been carried out, and the control of nitrogen oxides has also been increasingly put on the agenda. Mercury, chlorine, fluorine, and volatile organic pollutants have not yet been clearly required in coal-fired boilers in my country. With the development of my country's economy and society and the enhancement of people's awareness of environmenta...

Claims

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Application Information

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IPC IPC(8): B01D53/34B01D53/60
CPCY02A50/20
Inventor 周俊虎岑可法刘建忠王智化杨卫娟黄镇宇周志军程军
Owner ZHEJIANG UNIV
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