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Composite deoxidizing scale inhibitor applied to low-hardness water of boiler and preparation method of composite deoxidizing scale inhibitor

A scale inhibitor, low hardness technology, applied in water softening, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of long process time, affecting production operation, cumbersome operation, etc., to achieve easy degradation , Conducive to environmental protection production, the effect of reducing waste liquid discharge

Inactive Publication Date: 2019-10-01
鞍钢栗田(鞍山)水处理有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the water quality of fixed steam boilers and steam-water dual-purpose boilers (rated outlet steam pressure ≤ 2.5MPa) using water as the medium must be implemented in accordance with the requirements of industrial boiler water quality (GB1576-2001), and the total hardness in the requirements is ≤ 0.03mmol / L. Oxygen ≤ 0.1mg / L, but in the actual industrial production process, it is difficult for many enterprises to ensure that the water quality of industrial boilers meets the national standard. The data comparison of the boilers of many enterprises shows that the total hardness in water quality is ≤2mmol / L, and the dissolved oxygen is ≤1mg / L, in the daily boiler maintenance, the furnace wall is corroded, and some pipes and interfaces are scaled to varying degrees. The general treatment plan is to carry out chemical cleaning first, and then perform pre-film treatment. The process takes a relatively long time and the operation is relatively long. It is cumbersome and affects production operation
[0003] Boiler maintenance is the key to safe operation. Once corrosion and scaling appear, they will grow slowly. In the end, only chemical cleaning and pre-film treatment can be carried out. According to the current situation of boiler water quality, proper treatment should be carried out in daily operation. , Inhibit corrosion and scaling, avoid boiler shutdown chemical treatment, affect production and operation, so it is necessary to provide an efficient composite deoxidizer and scale inhibitor

Method used

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  • Composite deoxidizing scale inhibitor applied to low-hardness water of boiler and preparation method of composite deoxidizing scale inhibitor

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preparation example Construction

[0025] A preparation method for a composite deoxidizer and scale inhibitor applied to boiler low-hardness water, comprising the following methods:

[0026] 1) Preparation of sodium lignosulfonate-maleic anhydride copolymer: take sodium lignosulfonate as raw material, maleic anhydride as monomer, ammonium persulfate as initiator, and the addition of ammonium persulfate is 1 / 2 of the total mass of the copolymer 0.5%-4%, sodium lignosulfonate and maleic anhydride are mixed according to the mass ratio of 0.8-1.5:0.5-2, the reaction temperature is 40-60°C, the reaction time is 2-4h, and the graft copolymerization reaction is carried out to obtain the copolymer;

[0027] 2) Add the sodium lignosulfonate-maleic anhydride copolymer obtained in step 1) into the reaction kettle at room temperature, then slowly add phytic acid, 3-methoxypropylamine, hydroxyethylethylenediaminetriacetic acid , acetaldehyde oxime, and deionized water are added in batches. During the feeding process, the te...

Embodiment 1

[0031] A composite deoxidizer and scale inhibitor applied to low-hardness water in boilers. The composition and parts by weight of the composite deoxidizer and scale inhibitor are: 10 parts of phytic acid, 18 parts of acetaldehyde oxime, 3-methoxypropylamine 15 parts, 25 parts of sodium lignosulfonate-maleic anhydride copolymer, 8 parts of hydroxyethyl ethylenediamine triacetic acid, 22 parts of deionized water.

[0032] Preparation:

[0033] 1) Preparation of sodium lignosulfonate-maleic anhydride copolymer: take sodium lignosulfonate as raw material, maleic anhydride as monomer, ammonium persulfate as initiator, and the addition of ammonium persulfate is 1 / 2 of the total mass of the copolymer 0.5%, sodium lignosulfonate and maleic anhydride in a mass ratio of 0.8:1.2, the reaction temperature is 45°C, the reaction time is 3h, and the graft copolymerization reaction is carried out to obtain a copolymer;

[0034] 2) Under room temperature conditions, in the reaction kettle th...

Embodiment 2

[0036] A composite deoxidizer and scale inhibitor applied to low-hardness water in boilers. The composition and parts by weight of the composite deoxidizer and scale inhibitor are: 22 parts of phytic acid, 15 parts of acetaldehyde oxime, 3-methoxypropylamine 12 parts, 20 parts of sodium lignosulfonate-maleic anhydride copolymer, 10 parts of hydroxyethyl ethylenediamine triacetic acid, 20 parts of deionized water.

[0037] Preparation:

[0038] 1) prepare sodium lignosulfonate-maleic anhydride copolymer, take sodium lignosulfonate as raw material, maleic anhydride is monomer, ammonium persulfate is initiator, and the addition of ammonium persulfate is the copolymer gross mass 4%, sodium lignosulfonate and maleic anhydride in a ratio of 1:1 by mass, the reaction temperature is 40°C, the reaction time is 4h, and graft copolymerization is carried out to obtain a copolymer;

[0039] 2) Under room temperature conditions, in the reaction kettle that will prepare sodium lignosulfonat...

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Abstract

Disclosed are a composite deoxidizing scale inhibitor applied to low-hardness water of a boiler and a preparation method of the composite deoxidizing scale inhibitor. The composite deoxidizing scale inhibitor is prepared from, by weight, 10-30 parts of phytic acid, 6-18 parts of acetaldehyde oxime, 12-22 parts of 3-methoxypropylamine, 15-30 parts of sodium lignosulfonate-maleic anhydride copolymer, 5-20 parts of hydroxyethyl ethylene diamine triacetic acid and 10-40 parts of deionized water. The composite deoxidizing scale inhibitor applied to the low-hardness water of the boiler and the preparation method of the composite deoxidizing scale inhibitor have the advantages that the use of the boiler can be maintained for a long time, calcium and magnesium ions and other metal ions in the water are complexed and filtered out and removed by a filter in a system, and therefore the purpose of softening the water is achieved. The composite deoxidizing scale inhibitor has the advantages of being environmentally friendly, easy to degrade and unlikely to generate secondary pollution after being discharged. The chemical cleaning frequency of the boiler can be effectively reduced, the dischargeof waste liquid is indirectly reduced, the production efficiency is improved, and the environment-friendly production is facilitated. The composite deoxidizing scale inhibitor has excellent scale inhibition performance and high dissolved oxygen removal efficiency.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a composite deoxidizing and scale-inhibiting agent applied to boiler low-hardness water and a preparation method thereof. Background technique [0002] At present, the water quality of fixed steam boilers and steam-water dual-purpose boilers (rated outlet steam pressure ≤ 2.5MPa) using water as the medium must be implemented in accordance with the requirements of industrial boiler water quality (GB1576-2001), and the total hardness in the requirements is ≤ 0.03mmol / L. Oxygen ≤ 0.1mg / L, but in the actual industrial production process, it is difficult for many enterprises to ensure that the water quality of industrial boilers meets the national standard. The data comparison of the boilers of many enterprises shows that the total hardness in water quality is ≤2mmol / L, and the dissolved oxygen is ≤1mg / L, in the daily boiler maintenance, the furnace wall is corroded, and some...

Claims

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Application Information

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IPC IPC(8): C02F5/02C02F5/04
CPCC02F5/02C02F5/04C02F2303/08
Inventor 张柏鸿孙辉王坤鹏张宇李红李俊峰陈奇
Owner 鞍钢栗田(鞍山)水处理有限公司
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