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A kind of modified urea denitration agent and preparation method thereof

A technology of modified urea and denitrification agent, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, etc. It can solve problems such as the reduction of SNCR denitrification efficiency, the oxidation of ammonia or urea, and the reduction of NOx reduction activity by ammonia or urea. Effect of widening the working temperature, increasing reactivity, and improving reactivity

Active Publication Date: 2020-06-30
SHENZHEN HUAMING ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working temperature of SNCR is generally in the temperature range of 950°C to 1050°C. Usually, the denitrification efficiency of SNCR will decrease due to temperature fluctuations: if the temperature is too low, the activity of reducing NOx by ammonia or urea will decrease; if the temperature is too high, ammonia or urea will be oxidized to NOx

Method used

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  • A kind of modified urea denitration agent and preparation method thereof
  • A kind of modified urea denitration agent and preparation method thereof
  • A kind of modified urea denitration agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0016] 1) Preparation of modified urea denitrification agent:

[0017] Step 1: prepare synergist: under room temperature condition, the sodium cocoyl glycinate of 1.5 parts by mass and the sodium lauryl sulfate of 0.5 part are dissolved in the water of 100.0 parts by mass, add the aqueous phosphoric acid solution of 1.0 parts by mass ( Mass percent concentration is 20.0%), stir evenly. Thereafter, 8.0 parts by mass of ethyl orthosilicate was added. After continuing to stir for 20 minutes, the product was filtered out and dried at 50°C to obtain phosphorylated silica vesicles. Add 100.0 parts by mass of phosphorylated silica vesicles to 1000 parts by mass of an aqueous solution of titanyl sulfate (wherein: the mass percent concentration is 15.0%) and stir for 20 minutes, then filter and dry at 50 degrees Celsius. The synergistic component A is obtained. The element content of titanium metal element is: 2.3%.

[0018] Step 2: 100.0 parts by mass of urea, 0.5 parts by mass of...

Embodiment 2

[0026] 1) Preparation of modified urea denitrification agent:

[0027] Step 1: prepare synergist: under room temperature condition, the sodium cocoyl glycinate of 1.5 mass parts and the sodium lauryl sulfate of 0.6 part are dissolved in the water of 100.0 mass parts, add the phosphoric acid aqueous solution of 1.9 mass parts ( Mass percent concentration is 20.0%), stir evenly. Thereafter, 12.0 parts by mass of ethyl orthosilicate was added. After continuing to stir for 20 minutes, the product was filtered out and dried at 50°C to obtain phosphorylated silica vesicles. 100 mass parts of phosphorylated silicon dioxide vesicles are added to an aqueous solution of metal salts (wherein: the mass percentage concentration of titanyl sulfate is 1.0%; the mass percentage concentration of zinc sulfate is 13.0%; the mass percentage concentration of manganese sulfate is 1000 mass parts) After stirring for 20 minutes in a concentration of 1.0% by mass, it was filtered and dried at 50 deg...

Embodiment 3

[0031] 1) Preparation of modified urea denitrification agent:

[0032] Step 1: prepare synergist: under room temperature condition, the sodium cocoyl glycinate of 1.0 mass parts and the sodium lauryl sulfate of 0.8 parts are dissolved in the water of 100.0 mass parts, add the phosphoric acid aqueous solution of 1.5 mass parts ( Mass percent concentration is 20.0%), stir evenly. Thereafter, 10.0 parts by mass of ethyl orthosilicate was added. After continuing to stir for 20 minutes, the product was filtered out and dried at 50°C to obtain phosphorylated silica vesicles. Add 100 parts by mass of phosphorylated silica vesicles to 1000 parts by mass of an aqueous solution of a metal salt (wherein: the mass percentage concentration of titanyl sulfate is 2.2%; the mass percentage concentration of manganese sulfate is 12.8%) and stir for 20 Minutes later, filter and dry at 50°C to obtain synergistic component C. The content of titanium element is: 0.5%; the content of manganese el...

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Abstract

The invention discloses a modified urea denitration agent which is prepared from the following three parts: (1) 100.0 parts by mass of urea; (2) 0.5-10.0 parts by mass of high polymers such as polyethylene glycol, polyacrylic acid, sodium polyacrylate and polyvinyl alcohol; and (3) 0.1-10.0 parts by mass of a modified component. The modified component is a silicon dioxide microcapsule loading titanyl sulfate or titanyl sulfate and zinc sulfate or manganese sulfate and / or aluminum sulfate. The denitration rate of the denitration agent at 750-1050 DEG C can reach 83.2%-99.0%. The compound denitration agent is simple in preparation method, and can be widely applied to high temperature gas denitration in a thermal power plant, a waste incineration plant, etc.

Description

technical field [0001] The invention relates to a modified urea denitrification agent for boiler gas or flue gas denitrification. Background technique [0002] At present, my country's standards for industrial exhaust emissions are becoming more and more stringent. NO in stationary source industrial waste gas X are particularly valued. A typical NOx treatment method is based on selective non-catalytic reduction reaction (SNCR). The core content of SNCR denitrification technology is: without the participation of a catalyst, use a reducing agent such as ammonia or urea to reduce the NOx in the flue gas. X Reduced to nitrogen and water. The main advantage of the SNCR denitrification system is that the one-time investment and operating costs are relatively low, and the equipment occupies a small area. At present, the SNCR denitrification technology is the flue gas denitrification technology of coal-fired power plants in my country. The working temperature of SNCR is generall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/56
CPCB01D53/56B01D2251/206B01D2251/2067B01D2251/21B01D2251/402B01D2251/404B01D2251/602B01D2251/606B01D2258/02B01D2258/0233B01D2258/0283
Inventor 姚有为陈镖彭国斌
Owner SHENZHEN HUAMING ENVIRONMENTAL PROTECTION TECH CO LTD
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