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A low-phosphorus, environmentally friendly, corrosion and scale inhibitor applied to boilers and its preparation and use methods

A technology for corrosion and scale inhibition and boiler application in the fields of chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc. Water eutrophication and other problems, to achieve the effect of excellent corrosion and scale inhibition performance, fast film forming speed, and less dosage

Active Publication Date: 2020-10-16
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

[0003] At present, the corrosion and scale inhibitors mainly based on organic phosphate are gradually being replaced by low-phosphorus and non-phosphorus. The corrosion inhibition effect of phosphate-based corrosion and scale inhibitors often cannot take into account the entire system, and the phenomenon of alternating corrosion at the end of the boiler and the condensing part often occurs

Method used

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  • A low-phosphorus, environmentally friendly, corrosion and scale inhibitor applied to boilers and its preparation and use methods
  • A low-phosphorus, environmentally friendly, corrosion and scale inhibitor applied to boilers and its preparation and use methods
  • A low-phosphorus, environmentally friendly, corrosion and scale inhibitor applied to boilers and its preparation and use methods

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Experimental program
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preparation example Construction

[0025] Preparation of polyepoxysulfonic acid: Add 30-40 parts of 3-chloro-2-hydroxypropanesulfonic acid sodium and 25-35 parts of epoxy succinic acid into a pressure-bearing reactor, start stirring, and put the The temperature of the reaction kettle is increased to 70°C-120°C, and then 10-20 parts of sodium hydroxide with a mass concentration of 40% and 2-5 parts of alkaline earth metal (Ba) are added, and the reaction pH is controlled at 10-12, and the polymerization reaction time is 2 -4h to obtain polyepoxysulfonate carboxylate, and then react the obtained polyepoxysulfonate carboxylate with H-type cation exchange resin to obtain polyepoxysulfonate carboxylic acid. All the above are parts by mass.

[0026] Polyepoxysulfonic acid contains strong acidic groups, weak acidic groups and non-ionic groups at the same time, so that it has excellent scale inhibition and dispersion properties. Because it does not contain phosphorus and nitrogen, it is a green and environmentally fri...

Embodiment 1

[0057] The above-mentioned formula A, formula B, and formula C were tested according to the "Dynamic Method for Evaluation of Performance of Boiler Water Treatment Chemicals" (HG / T3924-2007). The chemical dosing point is set at the output steam pipeline, the boiler supply water pipeline, and the boiler condensate water pipeline. It is added according to 5mg / L, and the specific dosing ratio is 1:2:2. The test pressure in the boiler is selected as 1MPa, 2MPa, and 3MPa for the test respectively, and the time is 12 days. The test water quality parameter is the total hardness (3 / 4Ca 2+ +1 / 4Mg 2+ ) 6mmol / L, alkalinity (HCO 3 - ) 2mmol / L, chloride ion (Cl - ) 10mmol / L, the results of scale and corrosion inhibition rate are shown in Table 1.

[0058] Table 1:

[0059]

[0060] It can be seen from Table 1 that formula A, formula B and formula C have better scale inhibition rate and corrosion inhibition rate, and formula B has the best performance.

Embodiment 2

[0062] The water quality parameters of a boiler are shown in Table 2:

[0063] Table 2:

[0064]

[0065] Under the water quality conditions in Table 2, the boiler pressure was 2.4MPa, and the industrial simulation online test was carried out for 1 month. The corrosion and scale inhibitor of the invention was applied. Pipeline, dosing according to 2mg / L, the specific dosing ratio is 0.5:1.5:2. The test results show that the average corrosion inhibition rate of carbon steel is 0.026mm / a, the heating heat loss of the boiler is small, the scale inhibition performance is excellent, the boiler operation is stable, and the use effect is good.

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Abstract

The invention provides an environment-friendly and low-phosphorous corrosion and scale inhibitor applied to a boiler as well as preparation and use methods of the corrosion and scale inhibitor. The environment-friendly and low-phosphorous corrosion and scale inhibitor is prepared from components in parts by mass as follows: 6-30 parts of sodium hydrogen sulfite, 15-30 parts of sodium dihydrogen phosphate dihydrate, 5-35 parts of PECS (epoxysuccinic acid-2,3-epoxypropylsulfonic acid copolymer), 3-20 parts of polymethylacrylic acid, 15-35 parts of efficient neutralizing amine, 5-15 parts of sodium carbonate and 20-60 parts of deionized water. The corrosion and scale inhibitor is applicable to industrial boiler circulating water systems of petrochemical, chemical industry, metallurgy, electricity and the like, is excellent in corrosion and scale inhibition performance, low-phosphorous and environmentally friendly, and further has the advantages of being low in dosage, high in film formation speed, low in dirt yield and low in boiler heating heat loss. The corrosion and scale inhibitor has the characteristic of volatile amine, a ratio of amine concentration of steam to amine concentration of condensate water in a condensation part is in a range of 0.2-3, and the distribution ratio can effectively guarantee the corrosion inhibition effect of the end close to the boiler and the condensate water section of the boiler; the corrosion and scale inhibitor has the synergetic effect and convenient to store, and stability of the components is good.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a low-phosphorus, environment-friendly, corrosion and scale inhibitor applied to boilers, and methods for its preparation and use. Background technique [0002] Boilers play a very important role in industrial production and are widely used in thermal power stations, ships, locomotives, steel and industrial and mining enterprises. However, in the long-term operation of the boiler, it is inevitable to mix various substances related to scale and corrosion, which brings serious safety hazards to the boiler. Among them, hardness components, oxygen and carbon dioxide are the main causes of corrosion and scaling. At present, the commonly used boiler water treatment agent is corrosion and scale inhibitor based on organic phosphate. [0003] At present, the corrosion and scale inhibitors mainly based on organic phosphate are gradually being replaced by low-phosphorus and non-pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/12C02F103/02
Inventor 张柏鸿李华北胡文军王坤鹏李俊峰陈奇李红张冲陈丽鹏
Owner 鞍钢栗田(鞍山)水处理有限公司
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