All-carbon flue gas denitrification system and method

A flue gas and denitrification technology, which is applied in the full-carbon flue gas denitrification system and the denitrification field, can solve the problems of high biological toxicity in the ecological environment, air preheater blockage, ammonia secondary pollution, etc., and achieves convenient preparation, avoiding consumption, and high efficiency. The effect of removal

Active Publication Date: 2015-12-02
SHANDONG UNIV
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  • Claims
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Problems solved by technology

Considering various factors and benefits, the most commonly used technology is selective catalytic reduction technology (SCR). However, because the catalysts used in SCR technology are mostly vanadium-titanium catalysts, the high biological toxicity poses a great threat to the ecological environment, and Difficult to regenerate after being inactivated by poisoning
Moreover, this technology uses ammonia or urea as a reducing agent, which will cause corrosion to the pipeline; improper control will easily cause ammonia to escape and cause secondary pollution and blockage of the air preheater; storage is difficult, and once it leaks, it will easily cause widespread panic

Method used

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  • All-carbon flue gas denitrification system and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The reaction device 4 is a moving bed reactor.

[0041] A method for all-carbon flue gas denitrification, comprising the steps of:

[0042]1. The inlet flue gas detection device 1 monitors and learns that the oxygen content in the flue gas is 0.8%, and the hypoxic mode is turned on at this time;

[0043] 2. The flue gas and carbon monoxide (the amount of carbon monoxide is three times the amount of nitrogen oxides in the flue gas and the sum of the oxygen in the flue gas) are mixed, and they enter the moving bed reactor together for reaction. The reaction temperature is 150 ° C. The reaction The air speed ratio in the device is 4000h -1 .

[0044] The moving bed is loaded with carbon carrier catalyst particles, and the carbon carrier catalyst includes carrier active coke and active metal copper supported on the active coke. The active metal copper is loaded on the active coke carrier by impregnation method.

Embodiment 2

[0046] The reaction device 4 is a circulating fluidized bed.

[0047] A method for all-carbon flue gas denitrification, comprising the steps of:

[0048] 1. The entrance flue gas detection device 1 monitors and learns that the oxygen content in the flue gas is 2%, and at this time, the high oxygen mode is turned on;

[0049] 2. Flue gas and carbon monoxide (the amount of carbon monoxide is five times the amount of nitrogen oxides in the flue gas) respectively enter different zones in the circulating fluidized bed for reaction, the reaction temperature is 300 ° C, after 0.5 min of reaction. The circulating fluidized bed is divided into two areas, the ascending zone and the descending zone. The catalyst bed material is loaded in the bed, and the bed material circulates in the ascending zone and the descending zone. The circulation rate of the bed material is determined by the reaction time. The flue gas enters the descending zone, and the carbon monoxide enters the ascending zo...

Embodiment 3

[0052] The reaction device 4 is a double-chamber reactor.

[0053] A method for all-carbon flue gas denitrification, comprising the steps of:

[0054] 1. The entrance flue gas detection device 1 monitors and learns that the oxygen content in the flue gas is 5%, and at this time the high oxygen mode is turned on;

[0055] 2. The flue gas and carbon monoxide (the amount of carbon monoxide is three times the amount of nitrogen oxides in the flue gas) respectively enter different reaction chambers in the double-chamber reactor for reaction. The reaction temperature is 100 ° C. Every 5 minutes, the flue gas The input direction of gas and carbon monoxide is switched, and they start to be input into the reaction zone of the other party for reaction. The nitrogen oxides in the flue gas react and adsorb to the surface of the catalyst to form nitrogen-containing compounds, and the reactions of carbon monoxide and nitrogen-containing compounds to form nitrogen gas.

[0056] A carbon-sup...

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Abstract

The invention discloses an all-carbon flue gas denitrification system and method. Nitric oxides can be effectively removed with a carbon-based material as a catalyst and carbon monoxide as a reducing agent. The method includes the following steps that a reaction mode is determined according to the content of oxygen in flue gas and is divided into a high-oxygen mode and a low-oxygen mode; according to the high-oxygen mode, the flue gas and the reducing gas enter different reaction regions respectively to react for set time, then the flue gas enters the reaction region of the reducing gas for reacting, and the reducing gas enters the reaction region of the flue gas for reacting; according to the low-oxygen mode, the flue gas and the reducing gas enter the same reaction region to react; each reaction region contains the carbon support catalyst. By the adoption of the all-carbon denitrification system, efficient denitrification with the carbon-based material as the catalyst and the carbon monoxide as the reducing agent can be achieved, the denitrification cost is low, no other harmful ingredients are generated, and the all-carbon flue gas denitrification system is high in adaptability to temperature and components of the flue gas and particularly suitable for a power plant, a steel metallurgical industry and other industries with carbon materials as fuel.

Description

technical field [0001] The invention belongs to the field of flue gas treatment, and in particular relates to an all-carbon flue gas denitrification system and a denitrification method. technical background [0002] Since the beginning of the 21st century, with the rapid development of China's industry, pollution problems have become increasingly serious, and nitrogen oxides are one of the main air pollutants. Considering various factors and benefits, the most commonly used technology is selective catalytic reduction technology (SCR). However, because the catalysts used in SCR technology are mostly vanadium-titanium catalysts, the high biological toxicity poses a great threat to the ecological environment, and Difficult to regenerate after inactivation by poisoning. Moreover, this technology uses ammonia or urea as a reducing agent, which will cause corrosion to the pipeline; improper control will easily cause ammonia escape to cause secondary pollution and blockage of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56
Inventor 程星星马春元王志强王涛王鲁元
Owner SHANDONG UNIV
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