An integrated catalytic conversion system and method for reducing tail gas ammonia emissions

A technology of tail gas and catalyst, applied in the field of integrated catalytic conversion system, can solve problems such as ammonia escape and achieve high efficiency

Active Publication Date: 2021-06-18
NJTECH ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this device is not designed for high concentrations (>100ppmv) of ammonia slip

Method used

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  • An integrated catalytic conversion system and method for reducing tail gas ammonia emissions
  • An integrated catalytic conversion system and method for reducing tail gas ammonia emissions
  • An integrated catalytic conversion system and method for reducing tail gas ammonia emissions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Introduce 2000ppmv ammonia-containing tail gas from the tail gas inlet 100 into the flow interface expansion section 120, wherein the 100% (V / V) ammonia-containing tail gas enters the flow interface under the action of the air distribution device 130 The airflow inside the expansion section 120 is evenly distributed when the flow interface expands, and then enters the thermal management device 150 (external burner) to adjust the temperature. After the temperature is adjusted, it enters the ammonia removal catalyst module 200 to perform the ammonia removal reaction. The controlled temperature is 250℃, space speed ratio is 5000h -1 , gas velocity 2m·s -1 , the catalyst is a Co-Mn composite oxide catalyst, so that most of the NH in the ammonia-containing tail gas stream to be treated 3 (ammonia) into N 2 (nitrogen) and H 2 O (water). After the ammonia removal reaction is completed, the tail gas flow enters the ammonia oxidation catalyst module 300 to carry out the ammo...

Embodiment 2

[0093] Introduce 5000ppmv ammonia-containing tail gas from the tail gas inlet 100 into the flow interface expansion section 120, wherein 85% (V / V) of the ammonia-containing tail gas enters the flow interface under the action of the air distribution device 130 The airflow inside the expansion section 120 is evenly distributed when the flow interface expands, and then enters the thermal management device 150 (external burner) to adjust the temperature. After the temperature is adjusted, it enters the ammonia removal catalyst module 200 to perform the ammonia removal reaction. The controlled temperature is 400℃, space speed ratio is 10000h -1 , gas velocity 8m·s -1 , the catalyst is a Cu-Mn composite oxide catalyst, so that most of the NH in the ammonia-containing tail gas stream to be treated 3 (ammonia) into N 2 (nitrogen) and H 2 O (water). After the ammonia removal reaction is completed, the tail gas flow enters the ammonia oxidation catalyst module 300 to carry out the a...

Embodiment 3

[0097] 10000ppmv ammonia-containing tail gas to be treated is introduced from the tail gas inlet 100 into the flow interface expansion section 120, wherein 70% (V / V) ammonia-containing tail gas to be treated enters the flow interface under the action of the air distribution device 130 The airflow inside the expansion section 120 is evenly distributed when the flow interface expands, and then enters the thermal management device 150 (external burner) to adjust the temperature. After the temperature is adjusted, it enters the ammonia removal catalyst module 200 to perform the ammonia removal reaction. The controlled temperature is 500℃, space speed ratio is 20000h -1 , gas velocity 15m·s -1 , the catalyst is a Co-Cu-Mn composite oxide catalyst, so that most of the NH in the ammonia-containing tail gas stream to be treated 3 (ammonia) into N 2 (nitrogen) and H 2 O (water). After the ammonia removal reaction is completed, the tail gas flow enters the ammonia oxidation catalyst...

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Abstract

The invention relates to an integrated catalytic conversion system and method for reducing tail gas ammonia emissions. The system integrates an ammonia removal catalyst module, an ammonia oxidation catalyst module and a selective catalytic reduction catalyst module to control ammonia removal, ammonia oxidation and The temperature, space velocity ratio and gas flow rate of the selective catalytic reduction reaction have high efficiency when treating high-concentration ammonia waste gas, and the tail gas emission can meet the corresponding national standards. At the same time, it does not involve washing operations to treat high-concentration ammonia waste gas Liquid equilibrium (VLE) limit, will not produce any waste water, no secondary solid waste generation.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment equipment, and in particular relates to an integrated catalytic conversion system and a method thereof for reducing tail gas ammonia emissions. Background technique [0002] Ammonia slip is a common problem encountered in various industrial processes, such as ammonia scrubbers, ammonia CO 2 Capture and use in basic copper carbonate generation processes in the semiconductor industry where ammonia occurs as a reactant, reaction product or pollutant. The concentration of ammonia slip can vary from a few ppmv to several percent. [0003] Given NH 3 It is an irritating malodorous gas with a low olfactory threshold, and the measured olfactory threshold is 0.03–43mg / Nm 3 , so the environmental and health effects of ammonia slip must be considered when selecting and designing flue gas cleaning systems. [0004] Ammonia conversion can be achieved in three different ways: [0005] One is to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/58B01D53/56
CPCB01D53/8625B01D53/8634B01D2257/402Y02C20/10
Inventor 李绚天孙进徐学骁胡晓茜
Owner NJTECH ENVIRONMENT TECH CO LTD
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