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Denitration agent for coal-fired flue gas denitrification and preparation method thereof

A coal-fired flue gas and denitrification agent technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of difficult denitrification of nitrogen oxides, poor catalytic effect at low temperature, low flue gas temperature, etc., and achieve excellent denitrification active effect

Inactive Publication Date: 2021-07-16
QUANZHOU CHAOXU NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, nitrogen oxides (NOX) in coal-fired flue gas are one of the main pollutants of air pollution. Compared with the advantages of easy removal of sulfur dioxide and soot, the denitration of nitrogen oxides (NOx) in coal-fired flue gas is more important. Even more difficult, in the denitrification technology, the selective catalytic reduction denitrification technology can use the action of ammonia and catalyst to convert NOx into N 2 , is one of the most important denitrification technologies. The choice of catalyst is the key to selective catalytic reduction denitrification technology. Compared with petrochemical energy flue gas, coal-fired flue gas has a lower temperature and more complex components. Conventional The SCR catalyst used for the denitrification of coal-fired flue gas has the defects of short catalyst service time and poor catalytic effect at low temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 0.3mol of cetylpyridinium chloride to 1L of water to dissolve, and add 7mol of Mg(NO 3 ) 2 , 2mol of La(NO 3 ) 3 ·6H 2 O and 1mol of Ce(NO 3 ) 3 ·6H 2 O, stir evenly to obtain carrier solution. Add sodium hydroxide solution with a mass concentration of 10% to the carrier solution to adjust the pH to 10, and stir at room temperature for 12 hours after the addition, so that the metal ions in the solution form mixed precipitates of hydroxides. The mixed precipitate was dried in a hot air circulation drying oven at a temperature of 65°C for 14 hours, and transferred to a roasting furnace at a temperature of 450°C for 3 hours to obtain MgO / La 2 o 3 / C 2 o 3 composite metal carrier. 1 mol of butyl titanate was dissolved in ethanol to make a solution with a concentration of 40 g / L, and the above-mentioned calcined composite metal support was added thereto, stirred at room temperature for 3 h, and then left to stand for 8 h. After the impregnation is completed, ...

Embodiment 2

[0027] Add 0.3mol of cetylpyridinium chloride to 1L of water to dissolve, and add 7mol of Mg(NO 3 ) 2 , 2mol of La(NO 3 ) 3 ·6H 2 O and 0.5mol Ce(NO 3 ) 3 ·6H 2 O, stir evenly to obtain carrier solution. Add sodium hydroxide solution with a mass concentration of 10% to the carrier solution to adjust the pH to 10, and stir at room temperature for 12 hours after the addition, so that the metal ions in the solution form mixed precipitates of hydroxides. The mixed precipitate was dried in a hot air circulation drying oven at a temperature of 65°C for 14 hours, and transferred to a roasting furnace at a temperature of 450°C for 3 hours to obtain MgO / La 2 o 3 / C 2 o 3 composite metal carrier. 1 mol of butyl titanate was dissolved in ethanol to make a solution with a concentration of 40 g / L, and the above-mentioned calcined composite metal support was added thereto, stirred at room temperature for 3 h, and then left to stand for 8 h. After the impregnation is completed, t...

Embodiment 3

[0030] Add 0.3mol of cetylpyridinium chloride to 1L of water to dissolve, and add 7mol of Mg(NO 3 ) 2 , 2mol of La(NO 3 ) 3 ·6H 2 O and 2mol of Ce(NO 3 ) 3 ·6H 2 O, stir evenly to obtain carrier solution. Add sodium hydroxide solution with a mass concentration of 10% to the carrier solution to adjust the pH to 10, and stir at room temperature for 12 hours after the addition, so that the metal ions in the solution form mixed precipitates of hydroxides. The mixed precipitate was dried in a hot air circulation drying oven at a temperature of 65°C for 14 hours, and transferred to a roasting furnace at a temperature of 450°C for 3 hours to obtain MgO / La 2 o 3 / C 2o 3 composite metal carrier. 1 mol of butyl titanate was dissolved in ethanol to make a solution with a concentration of 40 g / L, and the above-mentioned calcined composite metal support was added thereto, stirred at room temperature for 3 h, and then left to stand for 8 h. After the impregnation is completed, t...

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Abstract

The invention relates to a denitration agent for coal-fired flue gas denitration and a preparation method thereof, and belongs to the technical field of environmental protection. The preparation method of the denitration agent comprises the following steps: dissolving cetylpyridinium chloride in water; adding denitration agent carrier metal nitrate into the solution; stirring to obtain a mixed solution of the carrier metal, with the denitration agent carrier metal component being Mg, La and Ce; slowly adding an alkali solution into the mixed solution in S1 under stirring to adjust the pH value to 10-12; after addition, stirring at room temperature for 10-16 hours, so that metal ions in the solution form hydroxide mixed precipitate; performing low-temperature drying on the mixed precipitate in S2, and then transferring the dried mixed precipitate into a kiln for high-temperature roasting to obtain a composite metal carrier; after butyl titanate is dissolved in ethyl alcohol, adding a composite metal carrier into the solution to conduct impregnation adsorption on titanium to obtain a carrier containing titanium after impregnation is completed; and carrying out low-temperature drying on the titanium-containing carrier, and then transferring into a furnace kiln for high-temperature roasting. The denitration agent has good low-temperature activity and long service lifetime.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a denitration agent for denitrification of coal-fired flue gas and a preparation method thereof. Background technique [0002] Coal is still the most important energy source with the largest consumption in my country. The soot, sulfur dioxide, and nitrogen oxides (NOx) contained in the flue gas after coal combustion X ) and other harmful substances are the main sources of environmental problems such as air pollution, acid rain, and greenhouse effect. In particular, nitrogen oxides (NOX) in coal-fired flue gas are one of the main pollutants of air pollution. Compared with the advantages of easy removal of sulfur dioxide and soot, the denitration of nitrogen oxides (NOx) in coal-fired flue gas is more important. Even more difficult, in the denitrification technology, the selective catalytic reduction denitrification technology can use the action of amm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01J23/10
CPCB01D53/8628B01D2255/2047B01D2255/2063B01D2255/2065B01D2255/20707B01D2258/0283B01J23/002B01J23/10B01J2523/00B01J2523/22B01J2523/3706B01J2523/3712B01J2523/47
Inventor 罗贤辉
Owner QUANZHOU CHAOXU NEW ENERGY TECH CO LTD
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