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Low-temperature denitration catalyst and application thereof

A low-temperature denitrification and catalyst technology, applied in the field of flue gas denitrification, can solve the problems of NOx emission that cannot meet the standard, high investment and operation costs, and small operating flexibility of fixed beds, so as to reduce investment and operation costs, increase density, and reduce energy consumption. consumption effect

Active Publication Date: 2019-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 2. The NOx content in the flue gas is related to the process conditions of the main device, and the fluctuation range is relatively large. However, the catalyst amount of the SCR fixed bed reactor is fixed. Once the NOx concentration range exceeds the design value, the NOx of the purified flue gas cannot Discharge
Therefore, the operating flexibility of the fixed bed is less
[0009] 3. During the operation of the fixed-bed reactor, the activity of the catalyst gradually decreases. When the NOx at the outlet of the reactor cannot meet the standard discharge, the catalyst needs to be replaced
It can be seen that the utilization rate of the catalyst in the fixed bed SCR reactor is too low
[0010] 4. After denitrification of flue gas, wet scrubbing and dust removal should be used together with desulfurization. The desulfurization waste liquid generated in the desulfurization and dust removal process also needs to be separated from liquid to solid. The process is long, the operation is complicated, and the investment and operation costs are high.

Method used

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  • Low-temperature denitration catalyst and application thereof
  • Low-temperature denitration catalyst and application thereof
  • Low-temperature denitration catalyst and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] 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, 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 soaked in a mixture of ethanol and water for 48 hours. After soaking, remove After the liquid phase, dry at 40°C until the product no longer loses weight significantly. Then calcined at 600°C for 6 hours to obtain a microsphere alumina carrier; impregnated the alumina carrier with an equal volume of impregnating solution containing iron nitrate and manganese nitrate, then dried at 80°C for 8 hours, calcined at 550°C for 6 hours, and cooled to room temperature. The microspheri...

Embodiment 2

[0055] 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, the resulting mixture was added dropwise into an oil column at 20-50°C to form microspheres, aged at 60°C for 24 hours, and then soaked in ethanol for 48 hours. After soaking and removing the liquid phase, it was placed in Dry at 50°C until the product no longer loses weight significantly. Then bake at 750°C for 5 hours to obtain microsphere alumina carrier; impregnate the alumina carrier with equal volume of impregnation solution containing iron nitrate and manganese nitrate, then dry at 100°C for 5 hours, bake at 550°C for 5 hours, and cool to room temperature , to obtain microspherical denitration ...

Embodiment 3

[0060] 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 .

[0061] The catalyst adopts microspherical denitration catalyst A.

[0062] First, the FCC regenerated flue gas passes through the boiler to take heat, the temperature is lowered from 650°C to the reaction temperature of 200°C, and the flow rate of the mixed gas containing ammonia is 1800Nm 3 / h, where the ammonia gas fraction is 4%, the stripping gas is 0.8MPa, superheated steam at 420°C, and the flow rate is 15Nm 3 / h. This embodiment adopts a mobile reactor, and the size of the inner sealed chamber of the reactor is 8m in length × 6m in width × 8m in height; the reaction time is 0.5s, and 3 layers of conveyor belts are set. The height of the catalyst bed on each conveyor belt is 30...

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Abstract

The invention discloses a low-temperature denitration catalyst and an application. The catalyst comprises, by weight, 75%-94% alumina carrier, 3%-20% Fe2O3 and 3%-20% MnO2; the catalyst is micro-spherical, the diameter is 2-6 millimeters, the total porosity is 60-85%, the proportion of mesopores of 5-20 nano-meters in all pores is 15-55%, and the proportion of macropores of 100-1000 nano-meters is40-75%; the distribution of the macropores is uniform and the macropores are communicated in three dimensions; the crushing strength of the lateral pressing is 5-20N / mm. The catalyst is applied to alow-temperature denitration reaction, can effectively remove the nitrogen oxide and sulfur oxide in flue gas, does not cause the problem of blocking a bed layer by ammonium bisulfate, and prolongs theoperation period of the device.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitration, and in particular relates to a low-temperature denitration catalyst and its application. Background technique [0002] Nitrogen oxides, collectively referred to as NOx, are one of the main sources of air pollution. The most harmful ones are: NO, NO 2 . The main hazards of NOx are as follows: (1) toxic to the human body; (2) toxic to plants; (3) can form acid rain and acid fog; (4) form photochemical smog with hydrocarbons; (5) destroy the ozone layer . [0003] Flue gas denitrification refers to the removal of NOx in flue gas. According to the treatment process, it can be divided into wet denitrification and dry denitrification. Mainly include: acid absorption method, alkali absorption method, selective catalytic reduction method, non-selective catalytic reduction method, adsorption method, plasma activation method, etc. Some researchers at home and abroad have also developed a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/10B01J37/08B01J37/02B01D53/90B01D53/60
CPCB01D53/8637B01D53/90B01J23/002B01J23/8892B01J37/0018B01J37/0201B01D2251/2062B01D2258/0283B01J2523/00B01J35/615B01J35/635B01J35/638B01J35/69B01J2523/31B01J2523/72B01J2523/842Y02A50/20
Inventor 王昊辰李欣姜阳王宽岭王明星
Owner CHINA PETROLEUM & CHEM CORP
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