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A system and method for in-situ degradation of dioxin-like substances in flue gas

A dioxin and flue gas technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of low nitrogen oxide emission concentration and lack of application basis, and achieve high-efficiency low-temperature in-situ degradation, source The effect of broad, promising industrialization prospects

Active Publication Date: 2020-11-10
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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  • A system and method for in-situ degradation of dioxin-like substances in flue gas
  • A system and method for in-situ degradation of dioxin-like substances in flue gas

Examples

Experimental program
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Effect test

Embodiment 1

[0045] This embodiment provides a system and method for carbon-based catalysts to degrade dioxins in cement kiln flue gas, such as figure 1 As shown, the system includes a purification pipeline, a degradation system 13 and a catalyst circulation system.

[0046] The cement kiln includes a calciner 15 and a cement rotary kiln 16. The purification pipeline is arranged between the flue gas outlet 11 and the clean gas inlet 12. The flue gas is introduced into the degradation system 13 of dioxins. After the degradation process of dioxins is completed, the flue gas returns to the flue gas discharge main pipeline from the clean gas inlet 12 and enters the raw meal mill.

[0047] 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 .

[0048] The catalyst inlet of the catalyst circulation system is at the initial position of the air intake of the dioxin-like subst...

Embodiment 2

[0056] This embodiment provides a system and method for carbon-based catalysts to degrade dioxin-like substances 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.

[0057] In the flue gas discharge pipeline of the sintering process in 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°C. Degradation system 23, after the flue gas completes the degradation process of dioxin, it returns to the flue gas discharge main pipeline from the clean gas inlet 22, enters the dust collector 25, and is discharged by the main exhaust fan 26.

[0058] The catalyst circulation system includes a catalyst injection pipeline, a catalyst interception recovery pipeline, ...

Embodiment 3

[0067] The difference with Example 1 is that the catalyst is replaced by cerium-loaded activated carbon AC-Ce, including CeO with a mass ratio of 30:100 2 and 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.

[0068] The degradation efficiency was 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 invention relates to the technical field of purification of exhaust gas pollutants, in particular to a system and method for degrading dioxin-like substances in flue gas by a carbon-based catalyst. Background technique [0002] Dioxin is the most poisonous substance found so far. It has the characteristics of fat solubility and accumulation, and it is easy to accumulate in the body, causing serious harm to the human body. Its toxicity is 1000 times that of potassium cyanide, and it is called "the poison of the century". ". [0003] The annual dioxin emissions from my country's iron and steel smelting industry account for 45.6% of the country's total emissions. my country's national implementation plan for implementing the "Stockholm Convention on Persistent Organic Pollutants" has listed the iron and steel smelting industry as a key industry for dioxin emission reduction. The "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standar...

Claims

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Application Information

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Patent Type & Authority Patents(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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