Preparation method of flue gas desulfurization and denitrification absorbent for rice hull ash/carbide slag system

A desulfurization and denitrification, calcium carbide slag technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problem that the denitrification efficiency is less than 40%, achieve large specific surface area, improve denitrification efficiency, and improve desulfurization activity.

Active Publication Date: 2018-10-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And it is mostly used in power plants, not suitable for the temperature environment of the cement industry
[0004] Our research group once proposed an integrated method of desulfurization and denitrification of dry cement kiln flue gas. This method is to mix rice husk ash and calcium carbide slag into cement raw materials, and it can be used in the decomposition furnace at 800-900°C. A good desulfurization and denitrification effect can be achieved at low temperature, but the denitrification efficiency is less than 40% below 800 °C

Method used

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  • Preparation method of flue gas desulfurization and denitrification absorbent for rice hull ash/carbide slag system

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Heat 100mL of deionized water to 70°C and put in 5g of calcium carbide slag, while stirring continuously, heat up to 85°C after mixing evenly, and add 5g of rice husk ash into the slurry, stir evenly, heat up to 100°C, and heat at constant temperature for 11 hours And keep magnetic stirring at 300r / min, filter the obtained slurry and dry at 150°C for 2h, and grind the dry powder. The absorbent of the rice husk ash / calcium carbide slag system was mixed with 90% cement raw meal at a mass ratio of 10%. Under simulated flue gas conditions, a simultaneous desulfurization and denitrification test was carried out. The denitrification rate reached 66% at 700°C, and the desulfurization The rate reaches 99%.

Embodiment 2

[0021] Heat 200mL of deionized water to 70°C and put in 5g of calcium carbide slag, while stirring continuously, mix evenly and then raise the temperature to 85°C, and add 5g of rice husk ash to the slurry, stir evenly, raise the temperature to 130°C, and heat at constant temperature for 8h And keep magnetic stirring at 300r / min, filter the obtained slurry and dry at 150°C for 2h, and grind the dry powder. The absorbent of the rice husk ash / calcium carbide slag system was mixed with 90% cement raw meal at a mass ratio of 10%. Under simulated flue gas conditions, a simultaneous desulfurization and denitrification test was carried out. The denitrification rate reached 85% at 700°C, and the desulfurization The rate reaches 99%.

Embodiment 3

[0023] Heat 50mL of deionized water to 60°C, put in 5g of carbide slag, stir continuously, mix well, then heat up to 70°C, add 5g of rice husk ash to the slurry, heat at 70°C for 5h and keep at 300r / min The obtained slurry was filtered and dried at 150° C. for 2 h, and the dry powder was ground. The absorbent of the rice husk ash / carbide slag system was mixed with 90% cement raw meal at a mass ratio of 10%. Under simulated flue gas conditions, a simultaneous desulfurization and denitrification test was carried out. The denitrification rate reached 62% at 700°C, and the desulfurization The rate reaches 99%.

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Abstract

The invention discloses a preparation method of a flue gas desulfurization and denitrification absorbent for a rice hull ash/carbide slag system, and belongs to the technical field of environmental protection. The absorbent is prepared by performing a hydration reaction on rice hull ash and the carbide slag, carrying out suction filtration and dehydration on the obtained slurry and drying at the temperature of 80 to 150 DEG C for 2 to 5 hours. The mass ratio of the rice hull ash to the carbide slag is (1 to 1) to (6 to 1), the solid-liquid mass ratio is (1 to 5) to (1 to 20), the hydration temperature is 70 to 130 DEG C and the hydration time is 5 to 11 hours. The absorbent of the rice hull ash/carbide slag system is mixed with 85 to 95 percent of cement raw material according to the massratio of 5 to 15 percent, and a simultaneous removal experiment of SO2 and NO is carried out under simulated flue gas conditions. A variety of hydrate calcium silicate is formed by hydration of the rice hull ash and the carbide slag; meanwhile, various metal oxides contained in the rice hull ash and the carbide slag can catalyze C-NO reaction and improve denitrification efficiency. The preparationmethod disclosed by the invention has the advantages of simple process, low raw material cost and capability of achieving the simultaneous desulfurization and denitrification effect at lower preheater temperature, wherein the absorbent can preferably reach 85 percent of denitrification rate and 99 percent of desulfurization rate.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation method of an absorbent for simultaneous desulfurization and denitrification of industrial flue gas. Background technique [0002] SOx and NOx emissions caused by human activities mainly come from the combustion of fossil fuels, especially coal-fired boiler plants such as power plants and cement plants. The most common technique to date remains the use of two separate systems to remove SO 2 and NO, but using desulfurization and denitrification technologies alone requires complex equipment and high operating costs. Simultaneous flue gas desulfurization and denitrification technology has become a future development trend. [0003] Some methods for simultaneous desulfurization and denitrification have been studied, among which dry absorbent is considered to be the most popular method for simultaneous desulfurization and denitrification, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/14
CPCB01D53/1456B01D53/1481B01D53/18B01D2252/10B01D2257/302B01D2257/50B01D2258/0283
Inventor 王亚丽陈美娜崔素萍马晓宇兰明章
Owner BEIJING UNIV OF TECH
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