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System and method for in-situ degradation of dioxin substances in smoke

A technology of dioxins and flue gas, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of lack of application basis and low concentration of nitrogen oxide emissions, and achieve a wide range of sources, high efficiency and low temperature in-situ Effect of degradation, good industrialization prospects

Active Publication Date: 2017-10-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for iron and steel metallurgy and other industries, the emission concentration of nitrogen oxides is low, and through the adjustment of raw materials and combustion process, the export of nitrogen oxides can meet the emission standards. Therefore, the use of denitrification devices to remove dioxins in the iron and steel metallurgy industry lacks application foundation and prerequisites.

Method used

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  • System and method for in-situ degradation of dioxin substances in smoke
  • System and method for in-situ degradation of dioxin substances in smoke

Examples

Experimental program
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Effect test

Embodiment 1

[0046] This embodiment provides a system and method for degrading dioxins in cement kiln flue gas with a carbon-based catalyst, such as figure 1 As shown, the system includes a purification pipeline, a degradation system 13 and a catalyst circulation system.

[0047] The cement kiln includes a decomposition furnace 15 and a cement rotary kiln 16. The purification pipe is set between the flue gas inlet 11 and the clean gas inlet 12. From the flue gas pipe of the cement kiln, the flue gas outlet 11 with a flue gas temperature of 400°C The flue gas is introduced into the dioxin degradation system 13, and after the flue gas completes the dioxin degradation process, it returns from the clean gas inlet 12 to the flue gas discharge main line and enters the raw mill.

[0048] The catalyst circulation system includes a catalyst injection pipeline, a catalyst interception recovery pipeline, a catalyst storage tank 141 and a catalyst storage tank 142.

[0049] The catalyst inlet of the catalyst...

Embodiment 2

[0057] This embodiment provides a carbon-based catalyst system and method for degrading dioxins in the flue gas of the sintering process in the iron and steel industry, such as figure 2 As shown, the system includes a purification pipeline, a degradation system 23 and a catalyst circulation system.

[0058] In the sintering process of the iron and steel industry, a purification pipeline is selected between the flue gas outlet 21 and the clean gas inlet 22, and the flue gas is introduced into dioxins from the flue gas outlet 21 with a flue gas temperature of 600℃ In the degradation system 23, after the flue gas completes the dioxin degradation process, it returns from the clean gas inlet 22 to the flue gas discharge main line, enters the dust collector 25, and is discharged by the main exhaust fan 26.

[0059] The catalyst circulation system includes a catalyst injection pipeline, a catalyst interception recovery pipeline, a catalyst storage tank 241 and a chemical agent storage ta...

Embodiment 3

[0068] The difference from Example 1 is that the catalyst is replaced with cerium-loaded activated carbon AC-Ce, including CeO with a mass ratio of 30:100 2 With carbon materials; the temperature at the flue gas outlet 11 is 550°C; the temperature of the degradation reaction is 400°C, and the cooling rate is 300°C / s.

[0069] The degradation efficiency is 93.2%.

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Abstract

The invention relates to a system and a method for in-situ degradation of dioxin substances in smoke. The system comprises: (I) a purifying pipeline arranged between any position of a smoke discharging pipeline and a purified gas outlet; (II) a degrading device arranged on the purifying pipeline and provided with a catalyst inlet and a catalyst outlet; and (III) a catalyst circulation device provided with a catalyst injection pipeline and a catalyst recovery pipeline, wherein the catalyst injection pipeline is connected with the catalyst inlet of the degrading device, and the catalyst recovery pipeline is connected with the catalyst outlet of the degrading device. The smoke is introduced to the degrading device, the catalyst is injected, and is in contact with the smoke at 200-600 DEG C in order to carry out a catalytic degradation reaction, obtained purified gas is discharged, and the catalyst is recycled. The system and the method realize the high-efficiency low temperature in-situ degradation of the dioxin substances, allow the degradation rate to reach 85% or above, and provide an effective method and way for the synergistic degradation of dioxins and precursors thereof in industrial waste gas.

Description

Technical field [0001] The present invention relates to the technical field of exhaust gas pollutant purification, in particular to a system and method for degrading dioxins in flue gas by a carbon-based catalyst. Background technique [0002] Dioxin is the most toxic substance found so far. It is fat-soluble and accumulative. It can easily accumulate in organisms and cause serious harm to the human body. Its toxicity is 1,000 times that of potassium cyanide and is called "the poison of the century." ". [0003] The annual dioxin emissions of my country's steel smelting industry account for 45.6% of the country's total emissions. my country's implementation of the "Stockholm Convention on Persistent Organic Pollutants" national implementation plan has listed the steel smelting industry as a key industry for dioxin emission reduction. The "Emission Standard of Air Pollutants for the Iron and Steel Sintering and Pelletizing Industry" (GB28662-2012) and the "Emission Standard of Air ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/70B01D53/88
CPCB01D53/8662B01D53/885B01D2257/2064B01D2258/0283
Inventor 朱廷钰郭旸旸郑扬王健
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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