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Organic deoxidant for boiler feed water

A technology of boiler feed water and oxygen scavenger, which is applied in descaling and water softening, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve the effects of fast oxygen removal, corrosion prevention, safe and convenient operation

Active Publication Date: 2012-09-19
北京莱柯倍耳技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an organic oxygen scavenger for boiler feed water to solve the disadvantages of using hydrazine oxygen scavenger and overcome the shortcomings of the current prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] An organic oxygen scavenger for boiler feed water described in Example 1 of the present invention is made of the following raw materials in weight percent: carbohydrazide 12.8%, morpholine 23.5%, cetylamine 0.4%, water 63.3% %. The process steps for producing 1 ton are: first add 633 kilograms of water to the reactor, heat the water temperature to 50 degrees Celsius, add 235 kilograms of morpholine and 4 kilograms of hexadecylamine, stir for 10 minutes, then add 128 kilograms of carbohydrazide, Stir for 60 minutes and cool to 20 degrees Celsius to get the finished product.

[0012] The application site is a power medium-pressure boiler device in an oil refinery, with a steam generation of 360 tons / h. The boiler feed water is filtered and ion-exchanged for primary desalination. The pH is 7.5, the conductivity is 3.4 μs / cm, and the hardness is 1.2 μmol / L. , Na + 125 μg / L, SiO 2 30μg / L, dissolved oxygen 50μg / L. Using this compound agent, adding 15mg / L continuously, the...

Embodiment 2

[0014] An organic oxygen scavenger for boiler feed water described in Example 2 of the present invention is made of the following raw materials in weight percent: carbohydrazide 10.5%, cyclohexylamine 24.5%, octadecylamine 0.3%, water 64.7%. The process steps to produce 1 ton are: first add 647 kg of water to the reactor, heat the water to 50 degrees Celsius, add 245 kg of cyclohexylamine and 3 kg of octadecylamine, stir for 15 minutes, and then add 105 kg of carbohydrazide , stirred for 60 minutes, and cooled to 20 degrees Celsius to get the finished product.

[0015] The application site is a high-pressure cracking boiler device in an ethylene plant, with a steam generation capacity of 87 tons / h. The boiler feed water is filtered, ion-exchanged, and mixed-bed for secondary desalination. The pH is 6.7, the conductivity is 0.4 μs / cm, and the hardness is 0 μmol. / L,Na + 15 μg / L, SiO 2 13μg / L, dissolved oxygen 20μg / L. Using this compound agent, adding 12mg / L continuously, th...

Embodiment 3

[0017] An organic oxygen scavenger for boiler feed water described in Example 3 of the present invention is made of the following raw materials in weight percent: carbohydrazide 13.5%, triethanolamine 15.5%, dimethylbutylamine 0.2%, water 70.8% %. The process steps for producing 1 ton are as follows: first add 708 kilograms of water to the reactor, heat the water temperature to 50 degrees Celsius, add 155 kilograms of triethanolamine and 2 kilograms of dimethylbutylamine, stir for 10 minutes, then add 135 kilograms of carbohydrazide, Stir for 60 minutes and cool to 20 degrees Celsius to get the finished product.

[0018] The application site is a high-pressure boiler device in a chemical plant, with a steam generation of 600 tons / h. The boiler feed water is filtered, ion-exchanged, and mixed-bed for secondary desalination. The pH is 6.8, the conductivity is 0.3 μs / cm, and the hardness is 0 μmol / L, Na + 18 μg / L, SiO 2 10μg / L, dissolved oxygen 15μg / L. Using this compound ag...

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Abstract

The invention relates to an organic deoxidant for boiler feed water. The deoxidant is prepared from the following raw materials in percentage by weight: 5 to 30 percent of hydrazide derivative, 2 to 25 percent of organic amine and the balance of water. The molecular formula of the hydrazide derivative is R<1>-CO-NH-R<2>, wherein R<1> and R<2> refer to substituent groups; the R<1> is CH3, CH3(CH2), NH2, NH2-NH, C6H5-NH, COOH, alkyl, naphthenic base, halogeno-group or heteroaryl; and the R<2> is CH3, CH2(CH3), NH2, NH2-NH, C6H5, COOH, alkyl, naphthenic base, halogeno-group or heteroaryl. The organic amine is cyclohexanamine, morpholine, triethanolamine, diethanolamine, monoethanolamine or amine shown as the molecular formula of R<3>-NH2, wherein R<3> is direct chain alkyl with 1 to 20 carbon atoms, branched chain alkyl, naphthenic base or aryl. The invention has the advantages that: the deoxidant is suitable for water supply systems of medium and high-pressure boilers in which primary or secondary demineralized water is taken as feed water; oxygen removing speed is high; and pH regulating agents such as ammonia water and the like are not required to be added additionally.

Description

technical field [0001] The invention relates to an organic oxygen scavenger for boiler feed water. Background technique [0002] Boiler is a kind of industrial equipment with large volume, which is difficult to install and replace. Therefore, it needs to be maintained and cleaned regularly to delay its aging speed as much as possible. However, after the boiler is used for a long time, scaling and corrosion will inevitably occur, so it is necessary to control the scaling and corrosion of the boiler. [0003] Oxygen scavenger, also commonly known as oxygen scavenger. Dissolved oxygen becomes one of the main causes of corrosion in boiler components (such as the boiler body, heat exchangers and economizers arranged at the upflow of the boiler body, and downstream steam and condensate pipes arranged in the boiler body). To prevent corrosion in boiler systems, it is necessary to remove dissolved oxygen from the boiler water. [0004] In order to solve the above problems, there ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/12
Inventor 王仲贤沈红新
Owner 北京莱柯倍耳技术有限公司
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