CN102633374B - Novel corrosion and scale inhibitor applicable to natural gas heating furnace - Google Patents
Novel corrosion and scale inhibitor applicable to natural gas heating furnace Download PDFInfo
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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
The present invention relates to the new antiseptic corrosion inhibitor for gas heating furnace and other relevant boiler,
Background technology
At present, gas heating furnace is one of visual plant in industrial production system.Because water consumption is large, in water, dissolving and the oxygen and carbon dioxide that carries all are state of saturation, easily boiler are caused strong fouling and corrosion, produce mixing incrustation.The fouling corrosion on process furnace surface can make the heat-transfer surface heat conductivility descend, and causes energy dissipation, and in addition, the corrosion ulcer that the corrosion on body of heater surface produces can further be accelerated the corrosion speed of interior metal, shortens the work-ing life of equipment.At present, have for the corrosion of the industrial equipmentss such as boiler, process furnace and fouling inhibiter commonly used: inorganic oxygen scavenger, organic oxygen scavenger, Wu Luotuoping (hexamethylenetetramine) are if fourth (two adjacent benzene methyl-thioureas), crude pyridine, phytic acid (nucite six phosphoric acid fat) etc.
Although add process furnace could be prevented and treated or slow down to the corrosion-mitigation scale-inhibition medicament corrosion and scale problems, but the WATER AS FLOW MEDIUM in process furnace is continuous evaporation concentration in the production run process, concentration rate increases, thereby the system salinity of causing obviously increases, will affect the drug effect of corrosion-mitigation scale-inhibition medicament, cause the generation of fouling and corrosion.Therefore, in the process of process furnace operation, should regularly discharge the WATER AS FLOW MEDIUM of changing in stove, reduce concentration rate.But should notice that concentration rate can not be too low, if too low, be unfavorable for improving the utilization ratio of water, cause the rising of Financial cost, increase simultaneously blowdown flow rate, bring burden to environment.Along with the growing tension of World Water resource with to the attention of environment protection, the properly distributed water, water saving has become the task of top priority.Therefore, the concentration rate of feedwater should be controlled in a suitable scope (index of stability R.S.I=6).The trend of future development is to select to be fit to high pH, high rigidity, macromole organic phosphine PAPEMP under high-alkali condition, the components such as good sulfonic acid multipolymer are as the major ingredient of corrosion inhibiting and descaling agent, or employing corrosion inhibiting and descaling agent+sulfuric acid combination treatment mode, can effectively improve the concentration rate of water.In actually operating, should determine to change the cycle of water according to concrete gas gathering station process furnace water water quality, control suitable concentration rate.
According to field condition and early stage the data grasped, at present, the inboard furnace wall fouling of Sweet natural gas water jacket process furnace is serious, the rust staining surface is the inhomogeneous block dirt layer of sorrel, if can not in time protect fouling and furnace wall corrosion, the thermo-efficiency reduction can cause a large amount of heat-energy losses on the one hand, and corrosion speed is further accelerated in the formation meeting of fouling and erosion on the other hand, affect the work-ing life of boiler, and bring certain potential safety hazard for producing.To process furnace carry out regularly, the burn into antiscale of standard detects and control, and is in time to find and eliminate the key of accident potential, is also the foundation of in good time making maintenance of equipment and maintenance decision-making.Therefore, develop a kind of chemical formulation, can stop preferably fouling, control corrosion, the corrosion and the scale problems that solve gas field gas gathering station process furnace are the task of top priority.
Summary of the invention
The objective of the invention is: a kind of corrosion inhibiting and descaling agent that is applicable to gas heating furnace is provided, is reduced in fouling in gas heating furnace.
The technical solution used in the present invention is: be applicable to the corrosion inhibiting and descaling agent of gas heating furnace, each weight percentages of components is:
Dodecyl benzyl dimethyl ammonium chloride (1227), 13～18%;
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP), 16～25%; (another name: hydroxy ethylene diphosphonic acid)
Trisodium Citrate, 2～4.5%;
Benzotriazole (BTA), 0.1～0.35%;
Sodium hydroxide, 3～6%;
Vitamins C, 0.5～1.5%;
All the other are water, and each component percentages sum is absolutely.
Be applicable to the preparation method of the corrosion inhibiting and descaling agent of gas heating furnace:
A, solid ingredient is mixed with the aqueous solution, there is no concentration limit.
A, take technical grade dodecyl benzyl dimethyl ammonium chloride (1227) and add the on-the-spot water of part, be made into dodecyl benzyl dimethyl ammonium chloride (1227) aqueous solution;
B, take chemical pure Trisodium Citrate and add the on-the-spot water of part, be made into sodium citrate aqueous solution;
C, take benzotriazole (BTA) and add the on-the-spot water of part, be made into benzotriazole (BTA) aqueous solution;
D, weighing sodium hydroxide add the on-the-spot water of part, the aqueous sodium hydroxide solution that is mixed with.
B. prepare B solution
Above-mentioned each aqueous solution is mixed in the following order:
A, dodecyl benzyl dimethyl ammonium chloride (1227) aqueous solution is added sodium citrate aqueous solution, stir;
B, add again benzotriazole (BTA) aqueous solution to stir in mentioned solution,
C, then add 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) liquid mixing of technical grade even;
D, slowly add aqueous sodium hydroxide solution at last, regulating pH is 5～5.5, obtains B solution.
C: with oxygen scavenger
Take vitamins C and add the on-the-spot water of part, be made into the vitamins C aqueous solution; The vitamins C aqueous solution is slowly added in B solution, stir after adding remaining on-the-spot water, obtain being applicable to the corrosion inhibiting and descaling agent of gas heating furnace, be lurid transparent solution.
Be applicable to the application of corrosion inhibiting and descaling agent in gas heating furnace of gas heating furnace:
In order to make liquid reach Uniform Dispersion in stove water, adopt the intermittent type dosing.Namely first add part water in stove, add 1/3 left and right medicament, then add part water, add 1/3 left and right medicament, divide like this dosing several times can make medicament Uniform Dispersion in stove water.
Beneficial effect of the present invention: the present invention is applicable to the corrosion inhibiting and descaling agent of gas heating furnace, coupon test proves, with blank water sample to the erosion rate of 20# steel and A3 steel respectively from 0.07455 and 0.06752mm/a be reduced to 0.04142 and 0.04340mm/a, corrosion inhibition rate can reach 38.66% and 41.79%, all increases than 30.29% and 35.15% of market like product.Corrosion inhibiting and descaling agent involved in the present invention is with low cost, and formula is stable, and preparation is simple, can be by regulating the applicable different boilers of each component ratio.
A. corrosion inhibiting and descaling agent raw material provided by the invention is easy to get, and is with low cost, and formula is stable, and preparation is simple, and environment is free from side effects substantially.
B. corrosion inhibiting and descaling agent provided by the invention to gas heating furnace and other relevant boiler have unusual effect Sweet natural gas water jacket process furnace in filling slow-release scale inhibitor post-etching speed less than 0.076mm/a.
C. add oxygen scavenger in corrosion-mitigation scale-inhibition system provided by the invention, can greatly improve corrosion mitigating effect.
Embodiment
Embodiment 1: with a volume 15m
3Gas heating furnace be example, the corrosion inhibiting and descaling agent that the present invention is applicable to gas heating furnace is described in further detail.Determine that by coupon test the optimum add amount of liquid in stove water is 1.1g/L, by the volume 15m of gas heating furnace
3, each process furnace needs 16.5kg corrosion-mitigation scale-inhibition medicament as can be known.
Be applicable to the preparation method of the corrosion inhibiting and descaling agent of gas heating furnace:
A, solid ingredient is mixed with the aqueous solution
A, the technical grade dodecyl benzyl dimethyl ammonium chloride (1227) that takes 1.1616kg add the on-the-spot water of 1.4784kg, are made into dodecyl benzyl dimethyl ammonium chloride (1227) aqueous solution of 2.64kg;
B, take the chemical pure Trisodium Citrate of 0.495kg and add the on-the-spot water of 0.99kg, be made into the sodium citrate aqueous solution of 1.485kg;
C, take 0.0495kg benzotriazole (BTA) and add the on-the-spot water of 0.0495kg, be made into benzotriazole (BTA) aqueous solution of 0.099kg;
D, take 0.75kg sodium hydroxide and add 0.75kg water, be mixed with the aqueous sodium hydroxide solution of 1.5kg.
B. prepare B solution
Mix in the following order by above-mentioned each aqueous solution:
A, dodecyl benzyl dimethyl ammonium chloride (1227) aqueous solution of 2.64kg is added the sodium citrate aqueous solution of 1.485kg, stir;
B, add again benzotriazole (BTA) aqueous solution of 0.099kg to stir in mentioned solution,
C, then add 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) liquid mixing of 3.3kg technical grade even;
D, the last aqueous sodium hydroxide solution that slowly adds 1.5kg, regulating pH is 5.23, obtains B solution.
C: with oxygen scavenger
Take the 0.165kg vitamins C and add the on-the-spot water of 0.495kg, be made into the vitamins C aqueous solution of 0.66kg;
The vitamins C aqueous solution is slowly added in B solution, add the on-the-spot water of 6.82kg and stir, obtain the corrosion inhibiting and descaling agent that 16.5kg is applicable to gas heating furnace, be lurid transparent solution.
Embodiment 2
Be applicable to the corrosion inhibiting and descaling agent of gas heating furnace, each weight percentages of components is:
Dodecyl benzyl dimethyl ammonium chloride, 13.5%;
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, 18%;
Trisodium Citrate, 3.5%;
Benzotriazole, 0.1%;
Sodium hydroxide, 3.4%;
Vitamins C, 0.5%;
Water is 61%.
The preparation method is as follows:
A, solid ingredient is mixed with the aqueous solution
A, take the technical grade dodecyl benzyl dimethyl ammonium chloride and add the on-the-spot water of part, be made into the dodecyl benzyl dimethyl ammonium chloride aqueous solution;
B, take chemical pure Trisodium Citrate and add the on-the-spot water of part, be made into sodium citrate aqueous solution;
C, take benzotriazole and add the on-the-spot water of part, be made into the benzotriazole aqueous solution;
D, weighing sodium hydroxide add the on-the-spot water of part, the aqueous sodium hydroxide solution that is mixed with;
B. prepare B solution
Above-mentioned each aqueous solution is mixed in the following order:
A, the dodecyl benzyl dimethyl ammonium chloride aqueous solution is added sodium citrate aqueous solution, stir;
B, add again the benzotriazole aqueous solution to stir in mentioned solution,
C, then add the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid liquid mixing of technical grade even;
D, slowly add aqueous sodium hydroxide solution at last, regulating pH is 5.23, obtains B solution;
C: with oxygen scavenger
Take vitamins C and add the on-the-spot water of part, be made into the vitamins C aqueous solution; The vitamins C aqueous solution is slowly added in B solution, stir after adding remaining on-the-spot water, obtain being applicable to the corrosion inhibiting and descaling agent of gas heating furnace.
The quantity of the on-the-spot water of described part is: can dissolve the material that will add, there is no strict quantity limitation.Those skilled in the art can understand and complete.
Embodiment 3
Be applicable to the corrosion inhibiting and descaling agent of gas heating furnace, each weight percentages of components is:
Dodecyl benzyl dimethyl ammonium chloride, 14%;
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, 22%;
Trisodium Citrate, 4%;
Benzotriazole, 0.15%;
Sodium hydroxide, 5%;
Vitamins C, 0.5%;
Be water 54.35.
The preparation method of corrosion inhibiting and descaling agent who is applicable to gas heating furnace is identical with embodiment 2.
Embodiment 4
Be applicable to the corrosion inhibiting and descaling agent of gas heating furnace, each weight percentages of components is:
Dodecyl benzyl dimethyl ammonium chloride, 15%;
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, 24%;
Trisodium Citrate, 4.5%;
Benzotriazole, 0.25%;
Sodium hydroxide, 6%;
Vitamins C, 1%;
Be water 49.25.
The preparation method is identical with embodiment 2.
Embodiment 5
Be applicable to the corrosion inhibiting and descaling agent of gas heating furnace, each weight percentages of components is:
Dodecyl benzyl dimethyl ammonium chloride, 17%;
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, 16%;
Trisodium Citrate, 3%;
Benzotriazole, 0.3%;
Sodium hydroxide, 3%;
Vitamins C, 1%;
Be water 59.7.
The preparation method is identical with embodiment 2.
Embodiment 6
Be applicable to the corrosion inhibiting and descaling agent of gas heating furnace, each weight percentages of components is:
Dodecyl benzyl dimethyl ammonium chloride, 18%;
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, 20%;
Trisodium Citrate, 2.5%;
Benzotriazole, 0.35%;
Sodium hydroxide, 4.4%;
Vitamins C, 1.5%;
Be water 53.25.
The preparation method is identical with embodiment 2.
Claims (2)
1. corrosion inhibiting and descaling agent that is applicable to gas heating furnace, it is characterized in that: each weight percentages of components is:
Dodecyl benzyl dimethyl ammonium chloride, 13～18%;
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, 16～25%;
Trisodium Citrate, 2～4.5%;
Benzotriazole, 0.1～0.35%;
Sodium hydroxide, 3～6%;
Vitamins C, 0.5～1.5%;
All the other are water, and each component percentages sum is absolutely.
2. preparation method who is applicable to the corrosion inhibiting and descaling agent of gas heating furnace is characterized in that:
A, solid ingredient is mixed with the aqueous solution
A, take the technical grade dodecyl benzyl dimethyl ammonium chloride and add the on-the-spot water of part, be made into the dodecyl benzyl dimethyl ammonium chloride aqueous solution;
B, take chemical pure Trisodium Citrate and add the on-the-spot water of part, be made into sodium citrate aqueous solution;
C, take benzotriazole and add the on-the-spot water of part, be made into the benzotriazole aqueous solution;
D, weighing sodium hydroxide add the on-the-spot water of part, are mixed with aqueous sodium hydroxide solution;
B. prepare B solution
Above-mentioned each aqueous solution is mixed in the following order:
A, the dodecyl benzyl dimethyl ammonium chloride aqueous solution is added sodium citrate aqueous solution, stir;
B, add again the benzotriazole aqueous solution to stir in mentioned solution,
C, then add the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid liquid mixing of technical grade even;
D, slowly add aqueous sodium hydroxide solution at last, regulating pH is 5～5.5, obtains B solution;
C: with oxygen scavenger
Take vitamins C and add the on-the-spot water of part, be made into the vitamins C aqueous solution; The vitamins C aqueous solution is slowly added in B solution, stir after adding remaining on-the-spot water, obtain being applicable to the corrosion inhibiting and descaling agent of gas heating furnace.
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| CN 201210109493 CN102633374B (en) | 2012-04-13 | 2012-04-13 | Novel corrosion and scale inhibitor applicable to natural gas heating furnace |
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| CN 201210109493 CN102633374B (en) | 2012-04-13 | 2012-04-13 | Novel corrosion and scale inhibitor applicable to natural gas heating furnace |
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| CN106319539A (en) * | 2016-09-27 | 2017-01-11 | 合肥天翔环境工程有限公司 | Metal scale remover |
| CN106904678A (en) * | 2017-02-08 | 2017-06-30 | 上海南阳精细化工有限公司 | Application of the L vitamin Cs in boiler supply water deaerating corrosion inhibiter |
| CN112592705B (en) * | 2020-12-22 | 2021-07-13 | 西南石油大学 | Ecological safety type scale and corrosion inhibitor and preparation method thereof |
| CN113336342A (en) * | 2021-06-09 | 2021-09-03 | 西安瑞杰实业股份有限公司 | Antiscaling agent for converter gas evaporative cooler, preparation method and application thereof |
| CN115432800A (en) * | 2022-09-19 | 2022-12-06 | 延长油田股份有限公司 | Preparation method of slow-release water deoxidant, product and application thereof |
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| CN1115306C (en) * | 1998-12-23 | 2003-07-23 | 王福霖 | Corrosion-retarding scale inhibitor for boiler |
| JP3958706B2 (en) * | 2003-04-23 | 2007-08-15 | 平成理研株式会社 | Water treatment agent |
| CN1854090A (en) * | 2005-04-25 | 2006-11-01 | 上海万森水处理有限公司 | Antioxidant corrosion-proofing and antisludging agent of boiler |
| US20090007616A1 (en) * | 2007-07-06 | 2009-01-08 | Bureman Phillip E | Method of inhibiting corrosion on ferrous metal surfaces in contact with nitrogen fertilizer solutions |
| CN102344206A (en) * | 2011-08-29 | 2012-02-08 | 大连市金州金河化工建材厂 | Antiscaling boiler water treatment agent |
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