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A kind of flue gas denitrification catalyst and its preparation method and denitrification process

A denitrification catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as scaling and blockage of the heat exchange tube layer, long process, corrosion, 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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  • A kind of flue gas denitrification catalyst and its preparation method and denitrification process
  • A kind of flue gas denitrification catalyst and its preparation method and denitrification process
  • A kind of flue gas denitrification catalyst and its preparation method and denitrification process

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Experimental program
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Effect test

Embodiment 1

[0047] At room temperature (20°C), mix water, absolute ethanol, aluminum chloride, polyethylene glycol, and formamide evenly, and then add pyridine. The contents of each component of the mixture are by weight: water 23%, ethanol 22% , aluminum chloride 20%, polyethylene glycol (viscosity average molecular weight 1 million) 0.3%, formamide 1%, pyridine 33.7%. After mixing evenly, add 0.5mol / L copper nitrate trihydrate and mix evenly. The resulting mixture is added dropwise into an oil column at 20~50°C to form microspheres, aged at 45°C for 48 hours, and then mixed with ethanol and water Soak the aged mixture for 48 hours. After soaking and removing the liquid phase, dry it at 40°C until the product no longer loses weight significantly. Then calcined at 600° C. for 6 hours, and then cooled to room temperature to obtain catalyst A. The content of CuO is 10wt%, the total porosity is 80%, the pores have a double pore distribution, and the macropores are evenly distributed, the av...

Embodiment 2

[0049] At room temperature (20°C), mix water, absolute ethanol, aluminum chloride, polyethylene glycol, and formamide evenly, and then add pyridine. The contents of each component of the mixture are by weight: water 31%, ethanol 29% , aluminum chloride 16%, polyethylene glycol (viscosity average molecular weight 2 million) 0.5%, formamide 3.5%, pyridine 20%. After mixing evenly, add 0.8mol / L copper nitrate trihydrate and 0.5mol / L ammonium metavanadate solution and mix evenly. The resulting mixture is added dropwise into an oil column at 20~50°C to form microspheres, and aged at 60°C After 24 hours, soak the aged mixture with ethanol for 48 hours. After soaking and removing the liquid phase, dry it at 50° C. until the product no longer loses weight significantly. Then it was calcined at 750° C. for 5 hours, and then cooled to room temperature to obtain catalyst B. CuO content is 15wt%, V 2 o 5 The content is 5%, the total porosity is 75%, the pores have a double pore distrib...

Embodiment 3

[0055] The catalyst adopts A.

[0056] FCC regeneration flue gas flow rate is 150,000 Nm 3 / h, temperature is 650°C, pressure is 10kPa, NOx concentration is 600mg / Nm 3 , SO 2 The concentration is 1000mg / Nm 3 , SO 3 The concentration is 20mg / Nm 3 , the dust content is 200mg / Nm 3 . NOx emission standard is 200 mg / Nm 3 .

[0057] First, the FCC regenerated flue gas passes through the boiler to obtain heat, and the temperature is lowered from 650°C to the SCR denitrification reaction temperature of 400°C; the flow rate of the mixed gas containing ammonia provided by the raw material supply area is 1120 Nm 3 / h, where the ammonia gas concentration is 4v%, the size of the inner sealed chamber of the reactor is 8m long × 6m wide × 8m high; the reaction time is 0.5s, and 3 layers of conveyor belts are set, and the height of the catalyst bed on each conveyor belt is 300mm. The size of the conveyor belt is 9m long × 5.8m wide. The stainless steel mesh conveyor belt is selected....

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Abstract

The invention provides a flue gas denitration catalyst, a preparation method thereof and a denitration process. The flue gas denitration catalyst of the present invention, based on the weight of the catalyst, includes: 75%~95% alumina carrier and 5%~25% CuO; the catalyst is microspherical, with a diameter of 2~6mm, preferably 3~5mm, and a total pore The rate is 60%~85%. The present invention prepares a denitration catalyst through the sol-gel method and oil column molding, and then loads active components. The catalyst cooperates with the multi-layer mobile denitrification process of the present invention, and can effectively remove dust while denitrifying. The catalyst can be reused, which improves the denitrification efficiency, further reduces the emission of nitrogen oxides and dust, and is suitable for industrial applications.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a flue gas denitration catalyst, a preparation method thereof 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 charact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/72B01J35/10B01D53/86B01D53/56B01J37/03
CPCB01D53/56B01D53/8628B01J23/002B01J23/72B01J37/033B01D2258/0283B01J35/638B01J35/651B01J35/635B01J35/633
Inventor 方向晨刘淑鹤王学海李欣程明珠王宽岭汪鹏
Owner CHINA PETROLEUM & CHEM CORP
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