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Wide-temperature-range dry flue gas denitrifying agent and preparation method thereof

A denitrification agent and flue gas technology, which is applied in the field of wide temperature dry flue gas denitration agent and its preparation, can solve the problems of high cost and insufficiency of sulfur, and achieves good denitration activity, wide temperature denitration activity, good catalytic oxidation and The effect of catalytic reduction activity

Inactive Publication Date: 2019-09-20
WUHAN KELIN FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses noble metal active components, which is costly and not resistant to sulfur, and requires additional hydrocarbon reducing agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 47.8g of barium nitrate and 202g of ferric nitrate nonahydrate in 200ml of deionized water, and heat to 50°C. Then add 17.2g of pseudo-boehmite and stir to form a slurry; weigh 118g of sodium carbonate and dissolve it in 350 ml of deionized water, add it to the slurry, keep the temperature at 50°C, and adjust the pH value to 10 with ammonia water , After the reaction is completed, it is aged for 2h, then filtered, washed, and baked at 120°C for 1h. Weigh CuSO 4 ·5H 2 O6 2.5g was dissolved in 100ml of deionized water, added to the mixture of dried filter residue and 3g of safflower powder and ground evenly, then extruded and formed, after standing for 5h, dried at 110°C for 4h, and then roasted at 500°C for 7h Obtain the described wide temperature dry process flue gas denitrification agent product, wherein BaO is 28%, Fe 2 o 3 40%, CuO 20%, Al 2 o 3 12%. The bulk density is 0.90g / cm 3 , specific surface area 95g / m 2 , Pore volume 0.25ml / g. The catalyst...

Embodiment 2

[0023] Dissolve 155.4g of magnesium nitrate and 125.3g of chromium nitrate in 300ml of deionized water and heat to 75°C. Then add 11.5g of pseudo-boehmite and stir to form a slurry; weigh 234g of sodium carbonate and dissolve it in 650 ml of deionized water, add it to the slurry, keep the temperature at 75°C, and adjust the pH value to 10 with ammonia water , after the reaction was completed, aged for 5h, then filtered, washed, and baked at 80°C for 4h. Weigh AgNO 3 Dissolve 14.7g in 60ml of deionized water, add it to the mixture of dried filter residue and 3g of scallop powder, grind it evenly, then extrude it, leave it for 5h, dry it at 150°C for 3h, and roast it at 400°C for 8h. Obtain the described wide temperature dry process flue gas denitration agent product, wherein MgO is 42%, Cr 2 o 3 40%, Ag 2 O is 10%, Al 2 o 3 8%. The bulk density is 1.25g / cm 3 , specific surface area 65g / m 2 , Pore volume 0.16ml / g. The catalyst is at 120°C with a space velocity of 1000h...

Embodiment 3

[0025]Dissolve 102.5g of calcium nitrate and 135.8g of cobalt nitrate hexahydrate in 500ml of deionized water and heat to 60°C. Then add 14.3g of pseudo-boehmite, and stir to form a slurry; weigh 207g of ammonium bicarbonate and dissolve it in 600 ml of deionized water, add it to the slurry, keep the temperature at 60°C, and adjust the pH value to 10. After the reaction is complete, age for 4 hours, then filter, wash, and bake at 100°C for 3 hours. Weigh 41.2g of manganese nitrate and dissolve it in 120ml of deionized water, add it to the mixture of dried filter residue and 3g of turnip powder and grind it evenly, then extrude and shape it, after standing for 5h, dry at 120°C for 4h, and then roast at 600°C After 6h, the described wide-temperature dry flue gas denitrification agent product is obtained, wherein CaO is 35%, CoO is 35%, MnO 2 20%, Al 2 o 3 10%. The bulk density is 1.05g / cm 3 , specific surface area 80g / m 2 , Pore volume 0.20ml / g. The catalyst is at 200°C w...

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Abstract

The invention discloses a wide-temperature-range dry flue gas denitrifying agent and a preparation method thereof. The flue gas denitrifying agent has a structure as aAO.bGxOy.mDxOy.nAl2O3, wherein A is one of barium, magnesium and calcium serving as group IIA metals, G is one of chromium, iron, cobalt and zinc serving as transition metals, and D is one of copper, manganese and silver. Calculated based on the total mass of a catalyst, the wide-temperature-range dry flue gas denitrifying agent comprises 28%-42% of AO, 30%-40% of GxOy, 10%-20% of DxOy and 8-12% of Al2O3. The dry flue gas denitrifying agent can be used for controlling the discharge of NOx in flue gases from an industrial boiler, a kiln, a coking coke oven and the like. The dry flue gas denitrifying agent has the advantage of realizing the ammonia-free efficient conversion of NOx within a relatively wide temperature range so as to be suitable for industrial application.

Description

technical field [0001] The invention relates to a wide-temperature dry-process flue gas denitrification agent and a preparation method thereof, and is particularly suitable for the dry-process flue gas denitrification agent required for the NOx emission control of flue gas such as industrial boilers, kilns and coking coke ovens and the preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants. With the improvement of people's living standards, environmental protection requirements are becoming more and more stringent, and flue gas denitrification is imperative. Among many flue gas denitrification methods, the catalytic reduction of NOx to harmless N 2 It is a good choice to discharge into the atmosphere. At present, the mature denitrification technologies widely used in the world include catalytic and non-catalytic ammonia reduction technologies. Selective catalytic reduction is SCR (selective catalytic reduction), and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/68B01J23/889B01J37/03B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/685B01J23/80B01J23/8892B01J37/0018B01J37/031B01J2523/00B01J2523/17B01J2523/25B01J2523/31B01J2523/842B01J2523/27B01J2523/18B01J2523/22B01J2523/67B01J2523/72B01J2523/845B01J2523/23
Inventor 王天元张先茂王泽金建涛郑敏王国兴王瑜赵志杰瞿玖
Owner WUHAN KELIN FINE CHEM
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