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Anti-crystallization additive and its preparation method and its application in boiler scr denitrification

An anti-crystallization agent and additive technology, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve problems such as crystallization, poor surface insulation effect, and large operation risks, so as to reduce energy consumption and use less Effect

Active Publication Date: 2022-04-22
SHANDONG ZHONGSHI YITONG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under winter working conditions, crystallization will occur if the surface insulation effect is poor or the heat tracing power failure occurs in an emergency. Once the equipment crystallizes, the pipeline / equipment must be replaced, which will cause considerable operational risks

Method used

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  • Anti-crystallization additive and its preparation method and its application in boiler scr denitrification
  • Anti-crystallization additive and its preparation method and its application in boiler scr denitrification
  • Anti-crystallization additive and its preparation method and its application in boiler scr denitrification

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preparation example Construction

[0022] Another embodiment of the present invention provides a method for preparing an anti-crystallization additive. The raw materials are mixed and heated to 65-75°C for reaction to obtain the primary product 1 of the additive, and the primary product 1 is heated to 45-55°C. Enter ammonia gas to react to obtain the additive primary product 2, and filter the additive primary product 2 to obtain the anti-crystallization additive; the raw materials include the following components according to mass percentages, palladium acetate 1-5%, rosin anti-crystallization agent 1-4%, ethanol 8-15%, triethanolamine 2-7%, carboxylic acid phosphonic acid scale inhibitor 1-4%, AA / AMPS 1-6%, and the balance is water.

[0023] In some examples of this embodiment, the temperature is heated to 65-75° C., and the reaction is kept for 10-20 minutes.

[0024] In some examples of this embodiment, the time for feeding ammonia gas to carry out the reaction is 40-60 minutes.

[0025] In some examples of...

Embodiment 1

[0032] 1. Add palladium acetate, rosin anti-crystallization agent, ethanol, triethanolamine, carboxylic acid phosphonic acid scale inhibitor, AA / AMPS, and pure water in a mass ratio of 1.5:1.3:8.1:6.4:2.2:2.4:78.1 In the dissolving tank, mix and stir, then raise the temperature to 70° C., keep the temperature for 15 minutes, and prepare the additive primary product 1.

[0033] 2. Put the primary additive product 1 into the reactor, heat it to 50°C, feed ammonia into the reactor, and then keep stirring for 50 minutes to prepare the primary additive product 2.

[0034] 3. Filter and purify the additive primary product 2 through a mechanical filter with a filtration accuracy of 5 microns to make the additive finished product.

Embodiment 2

[0036] 1. Add palladium acetate, rosin anti-crystallization agent, ethanol, triethanolamine, carboxylic acid phosphonic acid scale inhibitor, AA / AMPS, and pure water in a mass ratio of 2.3:1.9:6.5:3.6:1.3:1.4:83 respectively In the dissolving tank, mix and stir, then raise the temperature to 70° C., keep the temperature for 15 minutes, and prepare the additive primary product 1.

[0037] 2. Put the primary additive product 1 into the reactor, heat it to 50°C, feed ammonia into the reactor, and then keep stirring for 50 minutes to prepare the primary additive product 2.

[0038] 3. Filter and purify the additive primary product 2 through a mechanical filter with a filtration accuracy of 5 microns to make the additive finished product.

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Abstract

The invention discloses an anti-crystallization additive and a preparation method thereof and its application in boiler SCR denitrification. The raw materials of the anti-crystallization additive include the following components in terms of mass percentages: 1-5% of palladium acetate, 1-4% of rosin anti-crystallization agent, and 6% of ethanol ~15%, triethanolamine 2~7%, carboxylic acid phosphonic acid scale inhibitor 1~4%, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA / AMPS) 1~6%, The balance is water. The anti-crystallization additive provided by the invention can reduce the crystallization temperature of the urea solution with a concentration of 45-55% by about 10°C.

Description

technical field [0001] The invention relates to an anti-crystallization additive, a preparation method and its application in boiler SCR denitrification. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The SCR process is mainly divided into ammonia-based SCR and urea-based SCR, both of which are the reduction function of ammonia to NOx. Under the action of a catalyst, NOx (mainly nitric oxide) is reduced to nitrogen and water that have little impact on the atmosphere. The reducing agent It is ammonia gas, and the ammonia source of ammonia method SCR is mainly liquid ammonia. Because liquid ammonia is a dangerous chemical, there are many restrictions from transportation to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/56
CPCB01D53/8625B01D53/90
Inventor 郭鲁阳刘海申旭侯本杰张磊车刚崔辉
Owner SHANDONG ZHONGSHI YITONG GRP
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