Organic coated denitration agent and preparation method thereof

A denitration agent and coating technology, applied in the field of flue gas denitrification, can solve the problem of reduction, achieve the effect of wide source of raw materials, low equipment investment and production costs, and simple operation steps

Pending Publication Date: 2022-04-05
JIANGSU YANGNONG CHEM GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems existing in the prior art, the object of the present invention is to provide an organic coating denitrification agent and its preparation method. In the method, a catalyst is added during the molding process of the urea denitrification agent, which can correspondingly improve the denitrification efficiency and avoid the The problem of lower denitrification efficiency due to large diameter; at the same time, the surface of the shaped particles is modified by coating to form a polymer film to improve its heat resistance, so as to effectively slow down the ineffective decomposition of urea at the denitrification temperature. Improve the utilization rate of urea

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  • Organic coated denitration agent and preparation method thereof

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[0050] The specific embodiment part of the present invention provides an organic coating denitrification agent and a preparation method thereof, the preparation method comprising the following steps:

[0051] (1) After urea is melted, it is mixed with a catalyst, and granulated to obtain spherical particles;

[0052] (2) Put the spherical granules obtained in step (1) into the coating equipment, spray the spherical granules with isocyanate and polyalcohol for coating after uniform rotation, and obtain an organic coating denitrification agent.

Embodiment 1

[0055] This embodiment provides a method for preparing an organic coating denitrification agent, the preparation method comprising the following steps:

[0056] (1) Mix the urea with the catalyst after melting, the melting temperature of the urea is 132°C, carry out in an air atmosphere at normal pressure, the catalyst is copper oxide, and its addition is 500ppm, and put into the granulation equipment after stirring evenly, After granulation molding, the temperature of the granulation molding is 95°C to obtain spherical particles, and the average particle diameter of the spherical particles is 3mm;

[0057] (2) The spherical granules obtained in step (1) are dropped into a coating machine, the rotating speed of the drum in the coating machine is 40r / min, and the spherical granules are sprayed into isocyanate and polyalcohol successively after uniform rotation for coating. The isocyanate is diphenylmethane diisocyanate, the polyol is polyethylene glycol, the total addition of t...

Embodiment 2

[0059] This embodiment provides a method for preparing an organic coating denitrification agent, the preparation method comprising the following steps:

[0060] (1) Mix urea with a catalyst after melting, the melting temperature of the urea is 134°C, and it is carried out in an air atmosphere at normal pressure, the catalyst is copper oxide and iron oxide, the former addition is 200ppm, and the latter addition is 100ppm, stirred evenly and put into granulation equipment, granulation molding, the temperature of the granulation molding is 115 ℃, to obtain spherical particles, the average particle diameter of the spherical particles is 2mm;

[0061] (2) The spherical granules obtained in step (1) are dropped into a coating machine, the rotating speed of the drum in the coating machine is 30r / min, and the spherical granules are sprayed into isocyanate and polyalcohol successively after uniform rotation for coating. The isocyanate is toluene diisocyanate, the polyol is polypropylen...

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Abstract

The invention provides an organic coated denitration agent and a preparation method thereof, and the preparation method comprises the following steps: melting urea, mixing with a catalyst, and carrying out granulation molding to obtain spherical particles; and putting the obtained spherical particles into coating equipment, uniformly rotating the spherical particles, and spraying isocyanate and polyhydric alcohol for coating to obtain the organic coated denitration agent. According to the method, the catalyst is added in the forming process of the urea denitration agent, it is guaranteed that the catalyst is distributed in all local areas when the denitration agent is used, the denitration effect is improved, and the denitration efficiency is improved; according to the method, the surfaces of formed particles are subjected to surface modification in a coating mode, a polyurethane polymeric membrane is formed, the polyurethane polymeric membrane has a slow release effect, invalid decomposition of urea in the denitration process is reduced, the polyurethane polymeric membrane is fully used for reduction of nitric oxide, and the urea utilization rate is increased; the method is simple in operation steps, wide in raw material source, low in equipment investment and production cost and easy to industrially implement.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, and relates to an organic coating denitrification agent and a preparation method thereof. Background technique [0002] With the rapid development of the economy and the improvement of living standards, coal-fired units are also showing an increasing trend, and the resulting air pollution problems are gradually intensifying. The removal of nitrogen oxides in coal-fired flue gas is the top priority for preventing environmental pollution Therefore, flue gas denitrification technology is the focus of current research and application. The current mainstream denitrification technologies mainly include selective catalytic reduction (SCR) denitration and selective non-catalytic reduction (SNCR). agent and NO in flue gas x The reaction produces harmless nitrogen and water, thereby removing NO from the flue gas x , the method has low reaction temperature and high denitrification efficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
Inventor 徐林王再飞黄杰军丁克鸿王建昌杨树斌徐高明王丹
Owner JIANGSU YANGNONG CHEM GROUP
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