CN1687480A - Technique for manufacturing whole hot dip aluminizing heat exchanger (tube tank) - Google Patents
Technique for manufacturing whole hot dip aluminizing heat exchanger (tube tank) Download PDFInfo
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- CN1687480A CN1687480A CN 200510046405 CN200510046405A CN1687480A CN 1687480 A CN1687480 A CN 1687480A CN 200510046405 CN200510046405 CN 200510046405 CN 200510046405 A CN200510046405 A CN 200510046405A CN 1687480 A CN1687480 A CN 1687480A
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Abstract
The present invention relates to a technique for hot-dip aluminium for heat exchanger and spare part wholly. The characteristic is: The technique of hot-dip pure aluminum the whole heat exchanger is: wash the tube in acid, check-make the tube-pretreatment-plate supporting-warm up-melting agent treatment-hot-dip pure aluminum-slow cooling-post disposal-check, mend and finishing. The invention can hot-dip pure aluminum the heat exchanger and other good-sized complex equipment. The coatings are compact and uniformity, the penetrative level is deep, eliminate the stress in jointing and the chemistry performance of the metallic material change little. It eliminates the craze aroused by corrosion and stress of the tube of the heat exchanger, hydrogen-induced craze, corrosions of clearance and so on. Increase the longevity of the heat exchanger.
Description
Technical field
The present invention relates to the processing method that a kind of heat exchanging device E ﹠ SP carries out integral hot-dip aluminizing, and then develop the novel product that has than the strong corrosion resistant performance, belong to and adopt the flux method hot dip aluminum plating to produce aseptic production technical field, the production technique of particularly a kind of integrally hot-dip aluminized heat exchanger (tube bank).
Background technology
Interchanger is widely used in industries such as chemical industry, oil refining, food, power, nuclear power, interchanger is to move in high temperature, high pressure, corrosive medium complex environment, so the corrosion failure of interchanger is very serious, as in the annual corrosion failure rate of oil refining enterprise interchanger up to 27.2%, be higher than the corrosion failure rate of miscellaneous equipment far away.In corrosion failure, again based on stress corrosion crack, crevice corrosion, hydrogen induced cracking (HIC) etc.At present, both at home and abroad, prolong its work-ing life for improving the interchanger antiseptic property, generally all be adopt two kinds by way of, one is for adopting more anti-corrosion senior alloy material; It two is that carbon steel material or equipment are carried out surfacecti proteon, carries out the organic coating protection as the heat exchanging device, protects with the chemical ni-p plating method; In addition carbon steel material is carried out making after aluminising is protected again ways such as interchanger.These two kinds by way of all coming with some shortcomings or defective, and it is excessive to improve material quality method one-time investment, and applied environment has certain limitation; The protection of coating protecting, chemical ni-p plating method, calorized steel are made method existence such as protection: coating, coating, the plating leakage of infiltration layer pin hole are serious, sticking power is lower, easily aging defective such as peel off, corrosion resisting property does not have obvious raising, and counter stress burn into crevice corrosion can not obtain the effect of any alleviation and elimination.At present; hot-dip aluminum plating technology has deactivation method both at home and abroad; single bath process; two-bath process; gas protection method etc.; these methods can both be aluminized on the surface of ferrous materials; but exist the plating leakage of coating pin hole serious; the ferro-aluminium infiltration layer is thin not enough; especially these methods can not be to Heavy Weight; surface-area is big; baroque equipment or spare part carry out hot dip aluminum plating; such as heat exchanger tube; general weight is all more than several tons; the quantity of heat transfer tube is hundreds of roots at least all generally; thousands of at most, its structure formation is more complicated again, so present any hot-dip aluminum plating technology all can not heat exchanging organ pipe Shu Jinhang integral hot-dip aluminizing.
Summary of the invention
The present invention overcomes the defective that above-mentioned technology exists, purpose is for improving present two-bath process flux hot-dip aluminum plating technology, the production technique of a kind of integrally hot-dip aluminized heat exchanger (tube bank) is provided, enable large complicated equipment such as heat exchanging organ pipe bundle and carry out integral hot-dip aluminizing, and then develop and be better than coating protecting, the electroless plating protection, the heat exchanger tube of calorized steel protection, this novel integrally hot-dip aluminized heat exchanger tube bank has the coating densification, evenly, alloying layer thickness is darker, eliminate welding stress, the metallic substance chemical property does not have advantages such as considerable change, so its erosion resistance is more obvious, this novel integrally hot-dip aluminized heat exchanger especially can be eliminated the stress corrosion crack of heat exchanger tube preferably, hydrogen induced cracking (HIC), crevice corrosion destruction etc. are significantly increased the work-ing life of interchanger.
The production technique content Description of integrally hot-dip aluminized heat exchanger of the present invention (tube bank):
The production technique of integrally hot-dip aluminized heat exchanger of the present invention (tube bank) is characterized in that:
The present invention reaches the flux prescription that adopts at the surface of ferrous materials plating aluminized coating at a lower temperature to be: Nacl 40～43%, Kcl 37～40%, Na3AlF6 12～16%, AlF64～6%; The plating assistant agent prescription that is not at high temperature adopted by secondary oxidation for the interchanger that guarantees to clean up or metallic substance is:
Nacl?3～5％、Kcl?3～5％、NaF?3～5％、Zncl85～91％；
The equipment that can heat exchanger tube big to volume, Heavy Weight carries out preheating is electric preheating furnace, and the structure formation of electric preheating furnace is: around the bottom of electric preheating furnace and furnace wall electric heating tube is installed, hot air circulating system is set in stove;
The technical process of interchanger (tube bank) integral hot-dip aluminizing is:
Heat transfer tube-pickling, inspection-tube bank manufacturing-pre-treatment-help and plate processing-preheating-flux processing-hot dip aluminum plating---insulation slow cooling-aftertreatment-inspection, finishing, finished product.
Flux prescription of the present invention has that melting point is low, good fluidity, infiltration activation steel matrix is abundant, cost is low, the preparation characteristic of simple.Adopt this fused salt can make the aluminium atom at a lower temperature, be penetrated in the steel matrix, can obtain to be equivalent to the high temperature aluminising and the ferro-aluminium layer thickness that obtains, there is not the pin hole plating leakage in coating, and good corrosion resisting property is arranged.Plating assistant agent does not peel off under hot conditions, does not wear out, did not lose efficacy, and can well prevent steel matrix secondary oxidation.Owing to adopted preliminary heating device, can volume is big, Heavy Weight, big, the baroque heat exchanger tube of hot melt amount be preheating to about 300 ℃ equably, guaranteed that tube bank can carry out salt bath and aluminize in the short period.Adopted the processing method that moves up and down and rotate immersion plating, make the tube bank and aluminium liquid interface between the relative movement state improve, the tube bank surface temperature is more reached unanimity, make the iron content concentration ratio in the aluminium liquid more even, so the cementation coating thickness that tube bank is obtained is even, the composition unanimity, iron-holder is lower, and performances such as the anti-corrosion and sticking power of cementation coating are all apparently higher than static hot-dipping aluminium-plating method.
Embodiment
The production process of integrally hot-dip aluminized heat exchanger of the present invention (tube bank):
1, heat transfer tube is carried out pickling, check whether heat transfer tube tubing exists defective;
2, heat transfer tube is made heat-exchanging tube bundle;
3, heat-exchanging tube bundle carries out pre-treatment, and pre-treatment comprises: alkali cleaning-washing-pickling-four steps of washing;
4, heat-exchanging tube bundle helps plating to handle in helping coating bath, plating assistant agent is by Nacl 3～5%, Kcl 3～5%, NaF 3～5%, Zncl85～91%, add the water compound concentration and will reach the constituent element of solubleness minimum near saturated, the temperature of plating assistant agent is 80～90 ℃, and helping the plating time is 5～10 minutes;
5, will help the heat-exchanging tube bundle after plating is handled to place electric preheating furnace to carry out preheating, according to heat-exchanging tube bundle difference temperature gap electric heating tube is controlled automatically, guarantee that heat-exchanging tube bundle evenly heats up in warm, make heat-exchanging tube bundle avoid occurring surpassing the temperature stress distortion of the critical temperature difference, the hot temperature of its maximum prefetch is 300 ℃, 2 hours heating-up times;
6, carrying out flux in independent fusion fused salt pot handles, fused salt is by Nacl 40～43%, Kcl 37～40%, Na3AlF6 12～16%, AlF64～6% mixed preparing, fused salt after the preparation is thoroughly fusing in salt pan, before production and after producing a week, all need flux to be purified with the magnesium fluoride of fused salt total amount 1～3% at every turn, the fusing point of fused salt is 640 ℃, the flux use temperature is 680～700, the flux treatment time is 0.5～2 hour, depends on the size of heat-exchanging tube bundle diameter;
7, hot dip aluminum plating: hot dip aluminum plating is to carry out in independent molten aluminum liquid, and used aluminium is the Raw Aluminium of the above purity of AOO, and temperature of aluminum liquid is controlled at 700～720 ℃, and the immersion plating time is 30～50 minutes; Heat-exchanging tube bundle is in all the time in the immersion plating process and moves up and down and rotating state, and the speed of moving up and down is 4～6 meters/minute, speed of rotation be 2 the circle/minute;
8, insulation slow cooling: heat-exchanging tube bundle is proposing should to add stay-warm case behind the aluminum pot, stay-warm case is for telescopic automatically, heat-exchanging tube bundle after aluminizing is incubated slow cooling in holding furnace, holding furnace should guarantee that heat-exchanging tube bundle is incubated 4 hours about 600 ℃, slowly cooling uniformly then, the temperature difference of heat-exchanging tube bundle each point is no more than 50 ℃ in process of cooling, and the temperature drop speed control is about 100 ℃/hour, in the time of below the slow cooling to 100 ℃, air cooling is proposed heat-exchanging tube bundle;
9, aftertreatment: the heat-exchanging tube bundle of cool to room temperature is carried out aftertreatment,, simultaneously aluminium coated is carried out passivation to remove the flux of heat-exchanging tube bundle coating surface; Heat-exchanging tube bundle after the aftertreatment is carried out quality inspection, finishing, finished product packing.
Claims (4)
1, the production technique of a kind of integrally hot-dip aluminized heat exchanger (tube bank) is characterized in that: the technical process of interchanger (tube bank) integral hot-dip aluminizing is:
Heat transfer tube-pickling, inspection-tube bank manufacturing-pre-treatment-help and plate processing-preheating-flux processing-hot dip aluminum plating---insulation slow cooling-aftertreatment-inspection, finishing, finished product;
The production process of integrally hot-dip aluminized heat exchanger (tube bank) is:
(1), heat transfer tube is carried out pickling, check whether heat transfer tube tubing exists defective;
(2), heat transfer tube is made heat-exchanging tube bundle;
(3), heat-exchanging tube bundle carries out pre-treatment, pre-treatment comprises: alkali cleaning-washing-pickling-four steps of washing;
(4), heat-exchanging tube bundle helps plating to handle in helping coating bath, plating assistant agent is by Nacl 3～5%, Kcl 3～5%, NaF 3～5%, Zncl85～91%, add the water compound concentration and will reach the constituent element of solubleness minimum near saturated, the temperature of plating assistant agent is 80～90 ℃, and helping the plating time is 5～10 minutes;
(5), will help the heat-exchanging tube bundle after plating is handled to place electric preheating furnace to carry out preheating, according to heat-exchanging tube bundle difference temperature gap electric heating tube is controlled automatically, guarantee that heat-exchanging tube bundle evenly heats up in warm, make heat-exchanging tube bundle avoid occurring surpassing the temperature stress distortion of the critical temperature difference, the hot temperature of its maximum prefetch is 300 ℃, 2 hours heating-up times;
(6), carrying out flux in independent fusion fused salt pot handles, fused salt is by Nacl40～43%, Kcl 37～40%, Na3AlF6 12～16%, AlF64～6% mixed preparing, fused salt after the preparation is thoroughly fusing in salt pan, before production and after producing a week, all need flux to be purified with the magnesium fluoride of fused salt total amount 1～3% at every turn, the fusing point of fused salt is 640 ℃, the flux use temperature is 680～700, the flux treatment time is 0.5～2 hour, depends on the size of heat-exchanging tube bundle diameter;
(7), hot dip aluminum plating: hot dip aluminum plating is to carry out in independent molten aluminum liquid, and used aluminium is the Raw Aluminium of the above purity of AOO, and temperature of aluminum liquid is controlled at 700～720 ℃, and the immersion plating time is 30～50 minutes; Heat-exchanging tube bundle is in all the time in the immersion plating process and moves up and down and rotating state, and the speed of moving up and down is 4～6 meters/minute, speed of rotation be 2 the circle/minute;
(8), insulation slow cooling: heat-exchanging tube bundle is proposing should to add stay-warm case behind the aluminum pot, stay-warm case is for telescopic automatically, heat-exchanging tube bundle after aluminizing is incubated slow cooling in holding furnace, holding furnace should guarantee that heat-exchanging tube bundle is incubated 4 hours about 600 ℃, slowly cooling uniformly then, the temperature difference of heat-exchanging tube bundle each point is no more than 50 ℃ in process of cooling, and the temperature drop speed control is about 100 ℃/hour, in the time of below the slow cooling to 100 ℃, air cooling is proposed heat-exchanging tube bundle;
(9), aftertreatment: the heat-exchanging tube bundle of cool to room temperature is carried out aftertreatment,, simultaneously aluminium coated is carried out passivation to remove the flux of heat-exchanging tube bundle coating surface; Heat-exchanging tube bundle after the aftertreatment is carried out quality inspection, finishing, finished product packing.
2, the production technique of integrally hot-dip aluminized heat exchanger according to claim 1 (tube bank) is characterized in that: said flux prescription is:
Nacl?40～43％、Kcl?37～40％、Na3AlF6?12～16％、AlF64～6％。
3, the production technique of integrally hot-dip aluminized heat exchanger according to claim 1 (tube bank) is characterized in that: said plating assistant agent prescription is:
Nacl?3～5％、Kcl?3～5％、NaF?3～5％、Zncl85～91％。
4, the production technique of integrally hot-dip aluminized heat exchanger according to claim 1 (tube bank), it is characterized in that: the structure formation of said electric preheating furnace is: bottom and furnace wall at electric preheating furnace are equipped with electric heating tube on every side, and hot air circulating system is set in stove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510046405 CN1687480A (en) | 2005-05-10 | 2005-05-10 | Technique for manufacturing whole hot dip aluminizing heat exchanger (tube tank) |
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| CN 200510046405 CN1687480A (en) | 2005-05-10 | 2005-05-10 | Technique for manufacturing whole hot dip aluminizing heat exchanger (tube tank) |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575692A (en) * | 2009-05-22 | 2009-11-11 | 常熟市铁塔有限公司 | Ammonium-salt-free plating assistant agent used for hot dip galvanizing and technical methods for preparation and use thereof |
| CN101724802B (en) * | 2010-01-11 | 2011-01-19 | 鞍山市银马热熔浸铝有限公司 | Method for hot melting and aluminizing large steel |
| CN104032248A (en) * | 2014-06-19 | 2014-09-10 | 国家电网公司 | Plating auxiliary for plating alloy coating with high aluminum content on steel by using solvent method |
| CN106288536A (en) * | 2016-08-16 | 2017-01-04 | 安徽天祥空调科技有限公司 | The surface of internal cavity of a kind of condensing tube processes technique |
| CN107365954A (en) * | 2017-06-09 | 2017-11-21 | 中国石油大学胜利学院 | A kind of hot dipping aluminium plating technology of hot-dip aluminizing fluxing agent and steel construction piece |
| CN111101093A (en) * | 2018-10-29 | 2020-05-05 | 兴化市中科渗铝钢管有限公司 | Efficient aluminizing processing method |
-
2005
- 2005-05-10 CN CN 200510046405 patent/CN1687480A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575692A (en) * | 2009-05-22 | 2009-11-11 | 常熟市铁塔有限公司 | Ammonium-salt-free plating assistant agent used for hot dip galvanizing and technical methods for preparation and use thereof |
| CN101575692B (en) * | 2009-05-22 | 2014-08-13 | 常熟风范电力设备股份有限公司 | Ammonium-salt-free plating assistant agent used for hot dip galvanizing and technical methods for preparation and use thereof |
| CN101724802B (en) * | 2010-01-11 | 2011-01-19 | 鞍山市银马热熔浸铝有限公司 | Method for hot melting and aluminizing large steel |
| CN104032248A (en) * | 2014-06-19 | 2014-09-10 | 国家电网公司 | Plating auxiliary for plating alloy coating with high aluminum content on steel by using solvent method |
| CN104032248B (en) * | 2014-06-19 | 2016-08-24 | 国家电网公司 | A kind of fluxing agent for steel solvent method hot dip high aluminium content alloy layer |
| CN106288536A (en) * | 2016-08-16 | 2017-01-04 | 安徽天祥空调科技有限公司 | The surface of internal cavity of a kind of condensing tube processes technique |
| CN107365954A (en) * | 2017-06-09 | 2017-11-21 | 中国石油大学胜利学院 | A kind of hot dipping aluminium plating technology of hot-dip aluminizing fluxing agent and steel construction piece |
| CN111101093A (en) * | 2018-10-29 | 2020-05-05 | 兴化市中科渗铝钢管有限公司 | Efficient aluminizing processing method |
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