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Preparation method and denitration process of flue gas denitration catalyst

A denitrification catalyst and flue gas technology, applied in the direction of catalyst carriers, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of fouling and blockage of the heat exchange tube layer, low catalyst utilization rate, complicated operation, etc.

Active Publication Date: 2020-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The prior art has the following problems: (1) Since the flue gas generally contains SO 2 , SO 3 , O 2 With water vapor, when there is excess ammonia in the reaction zone (ammonia escape) it will combine with SO 3 The reaction generates ammonium salt, and the ammonium salt (NH 4 HSO 4 ), in a liquid state at a temperature of 180-240 ° C, with viscosity, and is easy to adhere to the heat exchange tube of the economizer, a downstream device of the SCR denitrification reactor, and stick to the dust in the flue gas, causing scaling and blockage of the heat exchange tube layer Corrosion, affecting the operating cycle of the device
It can be seen that the catalyst utilization rate of the fixed bed SCR reactor is too low; (4) after the general flue gas denitrification, wet washing and dust removal should be used together with desulfurization. Solid separation, long process, complex operation, high investment and operation costs

Method used

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  • Preparation method and denitration process of flue gas denitration catalyst
  • Preparation method and denitration process of flue gas denitration catalyst
  • Preparation method and denitration process of flue gas denitration catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Mix water, absolute ethanol, aluminum chloride, and polyethylene glycol evenly, and then add pyridine to form a gel. The contents of each component of the mixture are by weight: water 14%, ethanol 12%, aluminum chloride 25% , polyethylene glycol (molecular weight 2000) 7%, pyridine 42%. After mixing evenly, the resulting mixed product was dropped into an oil column at 25°C to form gel microspheres, and then the material was placed in a closed container, and compressed air was slowly introduced at a rate of 0.01 MPa / min until it reached an equilibrium of 8 MPa. Aging at 30°C for 10 hours, and slowly releasing the pressure to normal pressure at 0.1 MPa / min. The aged mixture was then soaked in ethanol for 48 hours. After soaking and removing the liquid phase, it was dried at 40° C. until the product no longer lost weight. Then bake at 600°C for 6 hours, and then cool to room temperature to obtain the alumina microspheres. The average macropore diameter of the alumina micr...

Embodiment 2

[0051] Mix water, absolute ethanol, aluminum chloride, and polyethylene glycol evenly, and then add pyridine. The contents of each component of the mixture are by weight: 15% water, 15% ethanol, 35% aluminum chloride, polyethylene glycol Diol (molecular weight 4000) 5%, pyridine 30%. After mixing evenly, the obtained mixed product was dropped into an oil column at 25°C to form gel microspheres, and then the material was placed in a closed container, and compressed air was slowly introduced at a rate of 0.05 MPa / min until it reached an equilibrium of 8 MPa. Aging at 40°C for 7 hours, then slowly release the pressure to normal pressure at a rate of 0.1MPa / min. Then soak the aged mixture with ethanol for 48 hours, after soaking and removing the liquid phase, dry at 50° C. until the product no longer loses weight significantly. Then bake at 650°C for 5 hours, and then cool to room temperature to obtain alumina microspheres. The average macropore diameter of the alumina microspher...

Embodiment 3

[0053] Mix water, absolute ethanol, aluminum chloride, and polyethylene glycol evenly, and then add pyridine to form a gel. The contents of each component of the mixture are by weight: water 34%, ethanol 26%, aluminum chloride 20% , polyethylene glycol (molecular weight 6000) 3%, pyridine 17%. After mixing evenly, the resulting mixed product was dropped into an oil column at 25°C to form gel microspheres, and then the material was placed in a closed container, and compressed air was slowly introduced at a rate of 0.02 MPa / min until it reached a balance of 6 MPa. Aging at 30°C for 12 hours, then slowly release the pressure to normal pressure at a rate of 0.5 MPa / min. The aged mixture was then soaked in ethanol for 48 hours. After soaking and removing the liquid phase, it was dried at 40° C. until the product no longer lost weight. Then calcined at 850°C for 3 hours, and then cooled to room temperature to obtain alumina microspheres. The average macropore diameter of the alumin...

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Abstract

The invention provides a preparation method of a flue gas denitrification catalyst and a denitrification process. The microspherical flue gas denitrification catalyst is prepared by adopting a sol-gelmethod and oil-column forming and then loading active components. By combining the catalyst with the multilayer mobile denitrification process, dust can be effectively removed while denitrification;the catalyst can be reused; the flue gas denitrification catalyst and the denitrification process improve the denitrification efficiency, and further reduce the discharge of nitrogen oxides and dust,thus being suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a preparation method of a flue gas denitration catalyst and a denitration process. Background technique [0002] NO x It is the main pollutant that forms acid rain, photochemical smog and atmospheric ozone layer destruction. During the "Twelfth Five-Year Plan" period, it has been clearly requested that NO x Realize total control. The "Emission Standards of Air Pollutants for Thermal Power Plants" implemented in 2012 requires NO x Emission limit is 100mg / m 3 . Therefore, how to effectively remove nitrogen oxides in flue gas has become an urgent problem to be solved. In the current denitrification technology, selective catalytic reduction (SCR) uses reducing agents such as ammonia to selectively reduce NO in exhaust gas through the action of catalysts. x Reductive conversion to N that is harmless to the atmosphere 2 and H 2 O, with the characteristi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/04B01J23/847B01J32/00B01J35/08B01J35/10B01D53/86B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2258/0283B01J21/04B01J23/8472B01J35/08B01J35/1066B01J35/1071
Inventor 刘忠生刘淑鹤王学海李欣王宽岭程明珠汪鹏
Owner CHINA PETROLEUM & CHEM CORP
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