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Device and method for coal-burning boiler fume ozone oxidation and simultaneous desulfurization and denitrification

A technology of ozone oxidation, desulfurization and denitrification, 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 saving operating costs

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

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a coal-fired boiler flue gas ozone oxidation simultaneous desulfurization and denitrification device and method for the whole flue discharge and high energy consumption of various electrocatalytic technologies

Method used

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  • Device and method for coal-burning boiler fume ozone oxidation and simultaneous desulfurization and denitrification
  • Device and method for coal-burning boiler fume ozone oxidation and simultaneous desulfurization and denitrification

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Embodiment 1

[0025] Layout scheme I for simultaneous desulfurization and denitrification by ozone oxidation of coal-fired boiler flue gas is shown in Figure 1. After the air is dried and purified, it is sent to the dry and filtered oxygen generator, and the generated oxygen is sent to the ozone generating device to prepare high-concentration ozone. The injection amount is adjusted from time to time according to the concentration of nitrogen oxides in the flue gas, and the molar ratio of ozone to nitrogen oxides is 1.1:1 to ensure a reaction time of at least 0.5s. The nozzle adopts porous grid injection, and the injection position is 1m away from the flue gas outlet of the air preheater. The treated flue gas enters the wet scrubber after passing through the electrostatic precipitator, and the absorption liquid is recycled. The flue gas is sent to the chimney after being treated by the wet scrubber and demister, and the absorbed sulfate and nitrate are concentrated and crystallized. The was...

Embodiment 2

[0027]Coal-fired boiler flue gas ozone oxidation and simultaneous desulfurization and denitrification scheme II, as shown in Figure 2. Send ozone into the low-dust flue gas environment at about 110°C after the electrostatic precipitator. The amount of ozone injected is dynamically adjusted according to the concentration of nitrogen oxides in the flue gas, and the molar ratio of ozone to nitrogen oxides is 1.0. The position of the injection point is guaranteed to be away from the washing machine The residence time at the tower entrance is more than 0.5s. Ozone is sprayed in a porous grid shape. The oxidized flue gas enters the lye washing tower for absorption, and the absorption liquid is recycled. After the flue gas is washed and defogged, it is sent to the chimney for discharge, and the absorbed sulfate and nitrate are concentrated. Crystallization treatment. The washing tower uses lye as the absorbent, and the washing tower is a spray tower or a packed tower. The lye used ...

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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 5 of smoke channel 4, ejecting into ozone O3 at low temperature section as 110-150Deg. C, while the ratio between ejected amount and nitrogen oxide is 0.5-1.5, to oxidize the low-level nitrogen oxide insoluble into soluble high-level nitrogen oxide, and the sulfur oxide is transformed into sulfur trioxide, and the reaction time is more then 0.5s; (3), feeding treated smoke into alkali washing tower 7 to wash, and absorbing high-level nitrogen oxide and sulfur oxide.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a coal-fired boiler flue gas ozone oxidation simultaneous desulfurization and denitrification device and a method thereof. Background technique [0002] The sulfur oxides and nitrogen oxides produced in the process of energy utilization have caused increasingly serious harm to our country's atmospheric environment. At present, the existing desulfurization technology can be divided into several categories such as dry method, semi-dry method and wet method. Dry method and semi-dry method have low investment and operation costs, but often have the disadvantage of low desulfurization efficiency, and large-scale boiler combustion equipment such as power plant boilers often cannot meet environmental protection requirements. At present, limestone / gypsum wet flue gas desulfurization technology (WFGD) is widely used in power plant boilers. This method has high desulfuriz...

Claims

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Application Information

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IPC IPC(8): B01D53/60
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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