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Denitration treatment method of flue gas discharged by ethylene cracking furnace

A technology of an ethylene cracking furnace and a treatment method, which is applied in the field of environmental protection waste gas treatment, can solve the problem that the denitration activity needs to be further improved, and achieve the effects of ensuring long-term stable operation, reducing the difference in NOx concentration and improving the denitration activity at low temperature.

Active Publication Date: 2019-03-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The denitrification activity of the catalyst under the condition of sulfur and water needs to be further improved

Method used

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  • Denitration treatment method of flue gas discharged by ethylene cracking furnace
  • Denitration treatment method of flue gas discharged by ethylene cracking furnace
  • Denitration treatment method of flue gas discharged by ethylene cracking furnace

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Effect test

Embodiment 1

[0032] The cross-sectional size of the honeycomb denitration catalyst monomer in the embodiment is 150×150 mm, the pore diameter is 6-12 mm, and the wall thickness is 0.8-2.2 mm. The catalyst preparation process is:

[0033] (1) Add carbon black powder and cerium nitrate to the ethanol solution containing tetraethyl orthosilicate (wherein the solid-liquid mass ratio is 1:8, cerium nitrate is CeO 2 The mass ratio of meter to carbon black powder is 3:1 orthoethyl silicate to SiO 2 The mass ratio of meter to carbon black powder is 2:1), under the condition of ultrasonic dispersion (the energy density of ultrasonic dispersion is 0.6kW / L, the temperature of ultrasonic dispersion is 40°C, and the time of ultrasonic dispersion is 1 hour), mix well, filter, Dry the solid phase at 50°C for 2 hours, and dry to obtain carbon black powder modified by silicon and cerium sources;

[0034] (2) Add 54g of carbon black powder obtained in step (1) (based on the weight of carbon black powder),...

Embodiment 2

[0044] The cross-sectional size of the honeycomb denitration catalyst monomer in the embodiment is 150×150 mm, the pore diameter is 6-12 mm, and the wall thickness is 0.8-2.2 mm. The catalyst preparation process is:

[0045] (1) Add carbon black powder and cerium nitrate to the ethanol solution containing tetraethyl orthosilicate (wherein the solid-liquid mass ratio is 1:8, cerium nitrate is CeO 2 The mass ratio of meter to carbon black powder is 3:1, and ethyl orthosilicate is SiO 2 The mass ratio of meter to carbon black powder is 2:1), under the condition of ultrasonic dispersion (the energy density of ultrasonic dispersion is 0.6kW / L, the temperature of ultrasonic dispersion is 40°C, and the time of ultrasonic dispersion is 1 hour), mix well, filter, Dry the solid phase at 50°C for 2 hours, and dry to obtain carbon black powder modified by silicon and cerium sources;

[0046] (2) Add 54g of carbon black powder obtained in step (1) (based on the weight of carbon black pow...

Embodiment 3

[0056] The cross-sectional size of the honeycomb denitration catalyst monomer in the embodiment is 150×150 mm, the pore diameter is 6-12 mm, and the wall thickness is 0.8-2.2 mm. The catalyst preparation process is:

[0057] (1) Add carbon black powder and cerium nitrate to the ethanol solution containing tetraethyl orthosilicate (wherein the solid-liquid mass ratio is 1:8, cerium nitrate is CeO 2 The mass ratio of meter to carbon black powder is 3:1 orthoethyl silicate to SiO 2 The mass ratio of meter to carbon black powder is 2:1), under the condition of ultrasonic dispersion (the energy density of ultrasonic dispersion is 0.6kW / L, the temperature of ultrasonic dispersion is 40°C, and the time of ultrasonic dispersion is 1 hour), mix well, filter, Dry the solid phase at 50°C for 2 hours, and dry to obtain carbon black powder modified by silicon and cerium sources;

[0058] (2) Add 54g of carbon black powder obtained in step (1) (based on the weight of carbon black powder),...

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Abstract

The invention relates to a denitration treatment method of flue gas discharged by an ethylene cracking furnace. The flue gas sequentially flows a radiation section, a convection heat exchange sectionA, an ammonia injection grid, a convection heat exchange section B, an SCR denitration reaction section and a convection heat exchange section C, and the SCR denitration reaction section is filled with a catalyst. A preparation method of the catalyst includes the steps: (1) adding carbon black powder and cerium nitrate into silicon-containing ethanol solution, uniformly mixing materials under thecondition of ultrasonic dispersion, separating solid and liquid, and drying a solid phase to obtain silicon and cerium modified carbon black powder; (2) adding the modified carbon black powder in titanium-containing ethanol solution, adding dilute nitric acid solution to form sol-gel, treating the sol-gel at high temperature in anaerobic atmosphere, and calcining the treated sol-gel in oxygen containing atmosphere to obtain a silicon-cerium-containing macro-porous titanium dioxide carrier; (3) mixing the titanium dioxide carrier, a molecular sieve and an active component precursor to form a honeycomb denitration catalyst. The method is good in denitration activity and high in water-vapor-resistant capability, and the catalyst cannot be easily cracked and long in service life.

Description

technical field [0001] The invention belongs to the technical field of environmental protection waste gas treatment, and in particular relates to a denitrification treatment method for flue gas discharged from an ethylene cracking furnace. Background technique [0002] Nitrogen oxides (NOx) have N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 and N 2 o 5 and other forms, and can cause a variety of hazards, such as photochemical smog can be produced with volatile organic compounds (VOC) in the atmosphere, which can cause strong irritation to the eyes and throat, and cause headaches and respiratory diseases. cause death. my country's NOx emissions have exceeded 20 million tons for many years in a row, 21.94 million tons in 2010, 24.043 million tons in 2011, 23.378 million tons in 2012, 22.273 million tons in 2013, and 20.78 million tons in 2014. In recent years, it has shown a continuous downward trend, but its pollution situation is still severe. On September 12, 2014, three min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01J29/16B01J29/48B01J35/04B01D53/86B01D53/56
CPCB01D53/8628B01D53/90B01J29/163B01J29/166B01J29/48B01D2251/2062B01D2258/0283B01J35/56
Inventor 王明星王宽岭李欣姜阳
Owner CHINA PETROLEUM & CHEM CORP
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