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Low-temperature fume oxidizing and denitration method and system

A technology for low-temperature flue gas and denitrification, applied in chemical instruments and methods, separation methods, nitrogen oxides/oxyacids, etc., can solve problems such as increasing operating costs, achieve low operating costs, high efficiency, and adapt to working conditions powerful effect

Inactive Publication Date: 2015-03-25
SHANDONG SHANDA WIT ENVIRONMENTAL ENGINEERING CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature of sintering flue gas in iron and steel plants is generally 120-150°C. Therefore, if SCR technology is used, the flue gas needs to be heated to increase the temperature, which greatly increases the operating cost.

Method used

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  • Low-temperature fume oxidizing and denitration method and system

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Embodiment

[0027] Take the sintering flue gas of a steel plant as an example. After the flue gas of the sintering machine is desulfurized by the limestone-gypsum wet method, the temperature of the flue gas with denitrification is about 50°C, and the chlorine dioxide gas generated by the chlorine dioxide gas generator 4 is blown into chlorine dioxide by the chlorine dioxide blower 5 In the gas mixer 6, the chlorine dioxide gas is fully mixed with the flue gas, and the mixed flue gas enters the oxidation tower 1. NO x The degree of oxidation is controlled at about 50%, and in oxidation tower 1, ClO 2 The gas oxidizes NO to easily absorbed NO 2 and N 2 o 3 . The calcium oxide absorption liquid is first stored in the absorption liquid tank 9, and the concentration of the calcium oxide absorption liquid is controlled. The absorption liquid is sprayed into the oxidation tower from the absorption liquid spray layer 12 through the absorption liquid spray pump 8, and the circulating absorpti...

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Abstract

The invention relates to a low-temperature fume oxidizing and denitration method and system. The method is characterized in that chlorine dioxide and low-temperature fume to be purified are subjected to gas-gas mixing in a fume channel and then are fed into an oxidizing tower; NO is oxidized into NO2 and NaO3 by chlorine dioxide in the oxidizing tower, and the reaction is performed under a temperature of 50 to 80 DEG C; the oxidizing and denitration are performed in the oxidizing tower, and the oxidizing reaction costs 1 to 2 seconds; the oxidized fume enters a spraying absorbing section and then is sprayed with a calcium oxide liquid at a mass concentration being 5 to 8%, and calcium nitrate and calcium nitrite liquids are generated after spraying and absorbing; and the calcium nitrite liquid is saturated and then is sequentially processed by impurity removing, evaporating, concentrating, crystallizing and purifying to obtain calcium nitrite. According to the low-temperature fume oxidizing and denitration method, ClO2 is selected and fully mixed with the fume to achieve denitration under a low temperature of 50 to 80 DEG C, and therefore, the problem of wastewater treatment can be solved; and meanwhile, the resource can be recycled; the denitration efficiency is up to more than 85%.

Description

technical field [0001] The invention relates to a method and system for oxidation and denitrification of coal-fired flue gas, in particular to a method and system for oxidation and denitrification of low-temperature flue gas, belonging to the technical field of environmental protection. Background technique [0002] The flue gas of coal-fired boilers contains SO 2 Pollutants such as , NOx and heavy metals (Hg and Ag) have increasingly become the main sources of air and soil pollution. During the "Twelfth Five-Year Plan" period, my country has put NO X As a binding indicator and included in the scope of regional total control. Therefore, increasing NO in the existing flue gas purification treatment device X Advanced purification devices have become an inevitable trend in the industry. [0003] Studies have shown that the total amount of NOx emitted by various equipment in iron and steel plants occupies the second place among stationary sources, second only to SO 2 emissi...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/56B01D53/73C01B21/50
Inventor 张汝松刘畅展茂源邓徐帧王猛刘清安刘昌峰于鹏
Owner SHANDONG SHANDA WIT ENVIRONMENTAL ENGINEERING CO LTD
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