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Novel corrosion and scale inhibitor applicable to natural gas heating furnace

A corrosion and scale inhibitor, heating furnace technology, applied in descaling and water softening, water/sludge/sewage treatment, chemical instruments and methods, etc. problems, to achieve the effect of improving corrosion inhibition effect, easy availability of raw materials and stable formulation

Active Publication Date: 2012-08-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the site situation and the data obtained in the early stage, at present, the inner wall of the natural gas water jacket heating furnace is seriously scaled, and the surface of the rust spot is a reddish-brown uneven massive scale layer. If the scaling and furnace wall corrosion cannot be protected in time, the On the one hand, the reduction of thermal efficiency will cause a large amount of heat energy loss; on the other hand, the formation of scaling and corrosion will further accelerate the corrosion rate, affect the service life of the boiler, and bring certain safety hazards to production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: With a volume of 15m 3 Taking natural gas heating furnace as an example, the novel corrosion and scale inhibitor suitable for natural gas heating furnace of the present invention will be further described in detail. It is determined by the hanging test that the optimal dosage of the liquid medicine in the furnace water is 1.1g / L, and the volume of the natural gas heating furnace is 15m 3 , it can be seen that each heating furnace needs 16.5kg of corrosion and scale inhibitors.

[0035] Preparation method of novel corrosion and scale inhibitor suitable for natural gas heating furnace:

[0036] A. Dispense the solid components into an aqueous solution

[0037] a, take by weighing 1.1616kg industrial grade dodecyl dimethyl benzyl ammonium chloride (1227) and add 1.4784kg on-site water, be made into dodecyl dimethyl benzyl ammonium chloride (1227) of 2.64kg aqueous solution;

[0038] B, take by weighing 0.495kg chemically pure sodium citrate and add 0.99kg...

Embodiment 2

[0051] A new type of corrosion and scale inhibitor suitable for natural gas heating furnaces, the weight percentage of each component is:

[0052] Lauryl dimethyl benzyl ammonium chloride, 13.5%;

[0053] Hydroxyethylidene diphosphonic acid, 18%;

[0054] Sodium citrate, 3.5%;

[0055] Benzotriazole, 0.1%;

[0056] Sodium hydroxide, 3.4%;

[0057] Vitamin C, 0.5%;

[0058] Water is 61%.

[0059] The preparation method is as follows:

[0060] A. Dispense the solid components into an aqueous solution

[0061] a, take industrial grade dodecyl dimethyl benzyl ammonium chloride and add part of on-site water to make dodecyl dimethyl benzyl ammonium chloride aqueous solution;

[0062] B, take chemically pure sodium citrate and add part of on-site water to make sodium citrate aqueous solution;

[0063] c, weigh benzotriazole and add part of on-site water to make benzotriazole aqueous solution;

[0064] D, take by weighing sodium hydroxide and add part of on-site water, the sodi...

Embodiment 3

[0075] A new type of corrosion and scale inhibitor suitable for natural gas heating furnaces, the weight percentage of each component is:

[0076] Lauryl dimethyl benzyl ammonium chloride, 14%;

[0077] Hydroxyethylidene diphosphonic acid, 22%;

[0078] Sodium citrate, 4%;

[0079] Benzotriazole, 0.15%;

[0080] Sodium hydroxide, 5%;

[0081] Vitamin C, 0.5%;

[0082] For water 54.35.

[0083] The preparation method of the novel corrosion and scale inhibitor suitable for natural gas heating furnace is the same as that in Example 2.

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Abstract

The invention relates to a novel corrosion and scale inhibitor, which is widely applicable to a natural gas heating furnace or other relevant boilers. A main agent of the corrosion and scale inhibitor is hydroxyethylidene diphosphonic acid (HEDP), and an auxiliary agent is dodecyl dimethyl benzyl ammonium chloride (1227), benzotriazole (BTA) and sodium citrate. Vitamine C is additionally added as deoxidant to obviously improve the corrosion inhibition effect. Finally, pH is adjusted to 5-6 by sodium hydroxide. The corrosion rates of a blank water sample to 20# steel and A3 steel are respectively reduced to 0.04142 mm / a and 0.04340 mm / a from 0.07455 mm / a and 0.06752 mm / a, and the inhibition rates can be up to 38.66% and 41.79% and be improved compared with 30.29% and 35.15% of the like product in the market. The corrosion and scale inhibitor related to the invention is low in cost, stable in prescription and simple in preparation, and can be applicable to different boilers by adjusting the ratio of each constituent.

Description

technical field [0001] The invention relates to a new anticorrosion and scale inhibitor for natural gas heating furnace and other relevant boilers, Background technique [0002] At present, the natural gas heating furnace is one of the important equipment in the industrial production system. Due to the large amount of water, the oxygen and carbon dioxide dissolved and carried in the water are in a saturated state, which is easy to cause strong scaling and corrosion to the boiler, resulting in mixed scaling. Scaling and corrosion on the surface of the heating furnace will reduce the thermal conductivity of the heat transfer surface, resulting in energy waste. In addition, the corrosion ulcers produced by the corrosion on the surface of the furnace body will further accelerate the corrosion rate of the internal metal and shorten the service life of the equipment. At present, commonly used corrosion inhibitors for corrosion and scaling of industrial equipment such as boilers a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14
Inventor 洪鸿王虎李强刘帮华王磊张成虎黄雪萍韩东兴高亮王霞侯亚龙高君微薛刚计李栋
Owner PETROCHINA CO LTD