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Device for preparing ammonia by hydrolyzing urea at normal temperature through non-thermal plasma synergistic catalysis

A non-thermal plasma and synergistic catalysis technology is applied in the field of devices for hydrolyzing urea to produce ammonia, which can solve the problem of high reaction temperature, and achieve the effects of low cost, convenient start and stop, and less potential safety hazards.

Pending Publication Date: 2021-01-08
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Research in Catalysis Science&Technology 3(2013)942-951 shows that ZrO 2 、TiO 2 、Al 2 o 3 Such catalysts can simultaneously catalyze the process of urea pyrolysis and HNCO hydrolysis to produce ammonia, but since the urea pyrolysis process is a rate-controlled step, the complete decomposition of urea to produce ammonia requires a reaction temperature higher than 200°C

Method used

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  • Device for preparing ammonia by hydrolyzing urea at normal temperature through non-thermal plasma synergistic catalysis
  • Device for preparing ammonia by hydrolyzing urea at normal temperature through non-thermal plasma synergistic catalysis

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Experimental program
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Effect test

Embodiment 1

[0032] ZrO 2 As a urea decomposition catalyst, a quartz tube with an inner diameter of 7.5mm, a wall thickness of 1mm, and a length of 50cm is used as a quartz tube reactor, a stainless steel rod with a diameter of 1mm is used as a high-voltage electrode, and a 4cm-long aluminum foil is used as a grounding electrode. Take an appropriate amount of ZrO 2 Placed in the discharge area, nitrogen with a flow rate of 1L / min is passed as a carrier gas into the non-thermal plasma synergistic catalytic single-tube reactor, the concentration of urea aqueous solution is 4wt%, the injection flow rate is 16.7μL / min, and the output voltage of the AC high-voltage power supply is 22kV, frequency 200Hz, discharge power 48W, obtained NH 3 The yield was 90%.

Embodiment 2

[0034] Take Al 2 o 3 As a urea decomposition catalyst, a quartz tube with an inner diameter of 28mm, a wall thickness of 1.5mm, and a length of 40cm is used as a quartz tube reactor, a stainless steel rod with a diameter of 1.4mm is used as a high-voltage electrode, and a 5cm-long aluminum foil is used as a grounding electrode. Take appropriate amount of Al 2 o 3 Placed in the discharge area, the air with a flow rate of 1L / min is passed into the non-thermal plasma synergistic catalytic single-tube reactor as the carrier gas, the concentration of urea aqueous solution is 25wt%, the injection flow rate is 20μL / min, and the output voltage of the AC high-voltage power supply is 21kV , frequency 200Hz, discharge power 44W, obtained NH 3 The yield was 70%.

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Abstract

The invention discloses a device for preparing ammonia by hydrolyzing urea at normal temperature through non-thermal plasma synergistic catalysis, and belongs to the field of SCR denitration reducingagent preparation. The device comprises a set of urea supply and injection system, a set of non-thermal plasma synergistic catalytic reactors and a set of gas distribution and collection system, and urea injected by the urea supply and injection system is enabled to enter the set of non-thermal plasma synergistic catalytic reactors arranged in a matrix mode. By means of the synergistic effect between non-thermal plasmas generated by dielectric barrier discharge and urea decomposition catalysts such as ZrO2, TiO2 and Al2O3, urea is efficiently hydrolyzed at normal temperature to produce ammonia. The device is simple in structure, low in cost, convenient to operate at normal temperature, convenient to start and stop, few in potential safety hazard and easy to popularize and apply in flue gasSCR denitration of power stations and industrial boilers (especially small and medium-sized boilers).

Description

technical field [0001] The invention relates to a non-thermal plasma synergistically catalyzing a device for hydrolyzing urea to produce ammonia at normal temperature, specifically a device that utilizes the synergistic effect of non-thermal plasma and catalyst to efficiently hydrolyze urea to produce ammonia at normal temperature, which is ammonia selective catalysis Reduction (NH 3 -SCR) denitrification process provides reducing agent (NH 3 ) device, which belongs to the field of SCR denitrification reducing agent preparation. [0002] technical background [0003] Nitrogen oxides (NO x ) is one of the important air pollutants, which can lead to major environmental problems such as photochemical smog and acid rain, and is the main precursor of nitrate in atmospheric fine particles. Stationary combustion sources such as thermal power plants and industrial kilns are NO x One of the main sources of emission, the emission of NO x NO accounts for 90% to 95%. [0004] Take ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/08B01J8/06B01D53/86B01D53/56C01C1/08
CPCB01D53/8625B01D2251/2062B01D2258/0283B01J8/06B01J19/088C01C1/086
Inventor 樊星李泽严杜孟威李坚
Owner BEIJING UNIV OF TECH
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