CN1381607A - Integrally hot-dip aluminized heat exchanger and its technology - Google Patents
Integrally hot-dip aluminized heat exchanger and its technology Download PDFInfo
- Publication number
- CN1381607A CN1381607A CN 02109108 CN02109108A CN1381607A CN 1381607 A CN1381607 A CN 1381607A CN 02109108 CN02109108 CN 02109108 CN 02109108 A CN02109108 A CN 02109108A CN 1381607 A CN1381607 A CN 1381607A
- Authority
- CN
- China
- Prior art keywords
- tube
- temperature
- tube bank
- heat exchanger
- salt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Coating With Molten Metal (AREA)
Abstract
An integrally hot-dip aluminized shell-and-tube heat exchanger is prepared through manufacturing tube bank, pre-treating, plating-aid treatment, thermoinsulating and preheating, treating with fused salt, hot-dip aluminizing, slow cooling thermo-insulating post-treating and packaging. Its advantages are resistance to high temp., corrosion-proofness, abrasino-resislance, and long service life.
Description
Technical field the present invention relates to a kind of adopt the fused salt hot dip aluminum plating method, tube and shell heat exchanger tube bank is carried out the processing method of integral hot-dip aluminizing.
The background technology interchanger is widely used in industries such as chemical industry, oil refining, food, power, nuclear power, accounts for 20% of gross investment in petrochemical enterprise, and 40% of equipment total amount is an interchanger, and heat exchanger tube adopts the carbon steel manufacturing more.Because the oxygen polarized action of cooling oxygen in water in the interchanger, corrode very serious, contain the impurity that inorganic salt, sulfide, nitride, organic salt, oxygen, carbonic acid gas, moisture content etc. have highly corrosive in the interchanger in the working medium in addition, so the heat exchanger tube of carbon steel manufacturing has only some months at least work-ing life, 1 or two years at most; The heat exchanger tube corrosion of adopting steel alloy to make in addition is also very serious, and maximum local corrosion speed is up to more than the 10mm/, and average corrosion rate also reaches 2.5～5.0mm/.Data introduction according to statistics, the spoilage of interchanger (mainly being tube bank) proportion maximum in the ratio that all petrochemical equipments damage.Why interchanger has so high corrosion damage rate, and except that the factor of manufactured materials, its one of the main reasons is because the manufacturing technology of present heat exchanger tube and the carrying out that aseptic technic all can not well prevent or control corrosion damage.Because tube and shell heat exchanger is to adopt metallic substance to make by it by punch and weld, tube sheet or heat transfer tube connect mode by welding, expanded joint or expanded and welded tube joint and couple together, near the weld bond or the mouth that expands, produce remaining welding stress, or remnants dilate drawing stress, the tensile stress that causes of the operating operating pressure of equipment in addition, make tube sheet and heat transfer tube joint form vulnerable zone, in corrosive medium, very easily produce stress corrosion fracture; The gap that exists when the welding of heat transfer tube and tube sheet enters among the slit electrolyte solution in addition, and stagnates therein, has more aggravated corrosion.At present, domestic is to improve the interchanger antiseptic property, prolongs its work-ing life, and the first adopts more corrosion resistant, the anti-alloy material that washes away or non-metallic material manufacturing interchanger, as, adopt non-metallic material manufacturings such as alloy material such as SAF-2205 duplex stainless steel and stupalith, impermeable graphite.Because the novel alloy material price is very expensive, one-time investment is increased greatly, increased production and the cost of overhaul is not had an optimistic view of by the user.Another approach is that the ferrous materials interchanger is carried out surface protection, and then improves the work-ing life of equipment, as adopting sacrificial protection, organic coating protection method, chemical nickel phosphorus plating protection method etc.The antiseptic property and the work-ing life of these method heat exchanging organ pipe bundles all increase, and are subjected to certain favor of enterprise, but owing to also have certain weak point, and limited their use range.For remedying the deficiency of these surface protection techniques; the domestic method for protecting surface of making heat exchanger tube of aluminized steel tube of having invented again; facts have proved that this heat exchanger tube has good resistance to high temperature oxidation, anti-cryogenic vulcanization, anti-hydrogen and splits; anti-nitride, sulfide, organic acid corrosive performance; but still there is unsurmountable shortcoming in the heat exchanger tube of making of aluminizing pipe, and corroding especially to some, local corrosion does not play good protective effect.Chinese invention patent CN1227272A discloses a kind of hot dipping aluminium plating technology for steel, belong to the solvent method hot dip aluminum plating, this technology is to coat quickening liquid on the plating piece surface, and then carrying out hot dip process, plating assistant agent is the settled solution that the aluminum fluoride by 30～60% Repone K, 15～45% sodium-chlor, 10～40% sodium aluminum fluoride and 5～30% makes.
Summary of the invention the objective of the invention is in order to overcome the deficiency that above-mentioned technology exists, for solving: as adopting hot dip--diffusion process, powder is filled calorizing, there is serious mass defect in the aluminium impregnation of steel tube layer, cause welding difficulty and weld seam antiseptic property relatively poor behind the aluminium impregnation of steel tube, making heat exchanger tube with aluminizing pipe can not control local form of corrosion and aluminising and the steel pipe mechanical performance is reduced and limit shortcoming such as its use range, providing a kind of can carry out integral hot-dip aluminizing to the heat exchanger tube of plain carbon stool or steel alloy manufacturing, can produce high temperature resistant, protection against corrosion, resistance to wear, the interchanger of long service life---integrally hot-dip aluminized heat exchanger and processing method thereof.
Integrally hot-dip aluminized heat exchanger of the present invention and technology content Description thereof:
Integrally hot-dip aluminized heat exchanger of the present invention and technology thereof, it is characterized in that: adopt steel to produce heat exchanger tube by existing method, to restrain integral body again and carry out hot dip aluminum plating, make the parts such as heat transfer tube, tube sheet, traverse baffle of tube bank plate the aluminized coating protective treatment simultaneously under the same process condition, its technical process is: tube bank manufacturings → pre-treatment → help and plate processing → heat-insulation preheating → fused salt processing → hot dip aluminum plating $→ insulation slow cooling → aftertreatment → packing;
(1), the aluminize time of tube bank in aluminum pot is 20～30 minutes, the temperature of aluminizing is controlled between 690～710 ℃;
(2), adopt two-bath process and, in salt pan, thorough salt bath carried out in tube bank and handle steel matrix wetting property fused salt prescription preferably, the fused salt prescription is: NaCL 43%, KCL 37%, Na
3ALF
616%, ALF
34%, the fused salt fusing point is 640 ℃, and salt bath is to carry out in salt pan;
(3), when aluminizing, tube bank is rotated and moves up and down, speed of rotation is per minute two circles, and the speed of moving up and down is 4～8 meters of per minutes; Can form the Fe-AL alloy layer of 50～100 μ m and the aluminum layer of 50～70 μ m on the surface of steel matrix;
(4), the tube bank after the process hot dip aluminum plating moves on at once and carries out slow cooling in the holding furnace, the holding furnace preheating temperature is 200 ℃, the temperature of this moment tube bank be 680～700 ℃ put into holding furnace after, temperature can reach 670～680 ℃ in the stove, be incubated gentle slow cool down with this understanding, because temperature is higher in the holding furnace, can quicken fine aluminium surface and atmospheric oxidation, form fine and close AL
2O
3Passivation film;
(5), for eliminating the unrelieved stress after the tube bank processing, the salt pot temperature is controlled in 710 ℃, the treatment time of tube bank in salt pan is 2 hours; The aluminum pot temperature is controlled in 720 ℃, and the treatment time of tube bank in aluminum pot is 30 minutes; Temperature was controlled at 680 ℃ after the inherent workpiece of holding furnace advanced stove, was incubated 3 hours 30 minutes; Tube bank is operation 6 hours under 680～720 ℃ temperature in above equipment, realizes high temperature Full Annealing, does not change metallographic structure;
(6), move to aluminum pot from salt pan, when aluminum pot moves to holding furnace again, just carry additionally stay-warm case from top to bottom from pot when tube bank proposes, tube bank is not exposed among the air, the temperature in the stay-warm case is controlled at 640～660 ℃ in tube bank;
(7), handle the back tube bank and carry out preheat requirements, the formula constituent of plating assistant agent is for adapting to plating assistant agent: NaCL 3%, KCL 3%, ZnCL 91%, NaF 3%, and the plating assistant agent temperature is controlled at more than 90 ℃, and concentration is saturated solution;
(8), do not produce plating leakage and thickness of coating uniformity inside and outside the tube bank, increase the flowability of fused salt, preparation fused salt fusing point is 640 ℃, and treatment temp is 680～710 ℃ for guaranteeing; Tube bank contacts with saline solution, aluminium liquid under rotation and the state of moving up and down, and guarantees the uniform distribution of ferroaluminium in the uniformity, aluminum pot of various components in the salt pan; Handle at the tube bank salt bath and to add 2～5% magnesium fluoride in forward direction salt pan or the aluminum pot, and thoroughly remove be suspended on the saline solution or aluminium liquid among impurity;
(9), for the control temperature stress, guarantee tube bank geometrical dimension and shape, adopt the heating of vertical preheating oven and electrothermal tube, electrothermal tube be distributed as that bottom distributes and the furnace wall distribution combines, the total power of electrothermal tube is 100KW, bottom 60KW, furnace wall 40KW; The internal heat air circulating system is set in preheating oven, and the hot blast that temperature is high is extracted out from the bottom, carries downwards by pipeline; Electrothermal tube is divided into 3 groups of controls, and the bottom is one group, and the furnace wall part is two groups; Preheating: before tube bank did not add preheating oven, preheating oven carried out preheating earlier, puts into workpiece when preheating temperature reaches 200 ℃, and to the energising of bottom heating tube, carried out hot air circulation, and then the furnace wall heating tube is switched on; The temperature of 3 thermocouple measurements tube banks is installed in the preheating oven, 3 thermopairs contact respectively outermost layer in tube bank, in ask layer and innermost layer, by control energising and power off time make interior, in, the temperature difference of outer 3 thermopairs is not more than 50 ℃; In the furnace wall of preheating oven, disrance sleeve is installed, to reduce the direct radiation of electric heating tube to the tube bank outer tube; Tube bank after leer must guarantee to aluminize is slowly cooled off, put into leer beginning 3 and a half hours in tube bank, guarantee 680 ℃ of homo(io)thermism of furnace temperature, begin slow cooling after 3 and a half hours, slow cooling speed is 100 ℃/hour, and the temperature difference of tube bank outer tube, intervalve, inner tube is controlled at below 40 ℃, when cooling temperature reaches 100 ℃, open bell gradually, the tube bank cool to room temperature is proposed in stove.
Integrally hot-dip aluminized heat exchanger tube bank of the present invention is at a lower temperature to SO
2And H
2The anti-uniform corrosion basically identical of corrosive mediums such as S is higher than nickel-chrome alloy steel far away.On the sea water resistance uniform corrosion several times to tens times of carbon steel.More than 700 ℃ the time,, overcome the shortcoming of fine aluminium plating exfoliation mainly based on high temperature oxidation.The integrally hot-dip aluminized heat exchanger tube bank can be eliminated welding and more than 80% of expanded joint unrelieved stress, has controlled the generation of stress corrosion widely, and has not produced crevice corrosion basically.The integrally hot-dip aluminized heat exchanger tube bank is in the same place heat transfer tube and traverse baffle with aluminium soldering, eliminated the induced vibration of tube bank, has avoided the impact damage between the boring of heat transfer tube and traverse baffle.The integrally hot-dip aluminized heat exchanger tube bank is welded before aluminizing, and need not improve weldprocedure, and weldquality has abundant guarantee, and weldquality also is significantly increased after aluminizing.The integrally hot-dip aluminized heat exchanger tube bank exists owing to there is aluminum layer on the surface, and the aluminum layer smooth surface is in use less scaling, has improved the use properties of interchanger.By the present invention the heat exchanger tube of plain carbon stool or steel alloy manufacturing is carried out hot dip aluminum plating, can produce high temperature resistant, protection against corrosion, resistance to wear, the heat exchanger tube of long service life.
Embodiment
Embodiment the objective of the invention is and will solve: 1, will realize ferroaluminium layer, aluminum layer, three protective layer of aluminium sesquioxide layer at the heat exchanger tube integral surface; just can realize aluminium-iron alloy layer with the same thickness of alumetizing process not carrying out High temperature diffusion, and guarantee the existence of aluminum layer and aluminium sesquioxide layer again.
2, the temperature and time of how to control salt bath, aluminizing, be incubated, make heat exchanger tube can obtain satisfactory aluminium-iron alloy layer thickness, can eliminate unrelieved stress to greatest extent again, increase saline solution, aluminium liquid flowability, and don't the mechanical property that influences the steel matrix is one of gordian technique of the present invention.
3, how to guarantee when long-time preheating, attached to the plating assistant agent on heat exchanger tube surface do not break, aging, the gordian technique that do not lose efficacy, the prescription of plating assistant agent.
4, once plating thousands of tube bank, and the heat exchanger tube behind the assembled formation is complex-shaped, the slit is numerous, guarantee that root root heat transfer tube can both obtain comprehensive, even, firm coating, the way at dead angle not occur be to improve the flowability of melting liquid, minimizing liquid impurity for complicated and slit part in the cross section.
5, the temperature stress of heat exchanger tube the hot dip aluminum plating time being controlled in the tolerance band, guaranteeing the requirement of dimensional precision conformance with standard, is key of success of the present invention.
Integrally hot-dip aluminized heat exchanger of the present invention and technology thereof are to realize like this, (1), according to research to the Fe-AL reaction diffusion dynamical, set about from the prolongation time of aluminizing, increase alloy layer thickness, with the aluminize time of tube bank in aluminum pot is 20～30 minutes, and the temperature of aluminizing is controlled between 690～710 ℃.
(2), adopt two-bath process and, in salt pan, thorough salt bath carried out in tube bank and handle steel matrix wetting property fused salt prescription preferably, steel matrix is well soaked into, create alloying condition preferably.The fused salt prescription is: NaCL 43%, KCL 37%, Na
3ALF
616%, ALF
34%, the fused salt fusing point is 640 ℃.Salt bath is to carry out in salt pan, salt pan diameter of phi 1300mm, dark 7000mm.
(3), the generation of alloy layer also depends on the moving state at two interfaces, and matrix surface temperature, the hybrid mode of the two kinds of metals in interface, factors such as concentration ratio; The present invention is rotated and moves up and down tube bank when aluminizing, and speed of rotation is per minute two circles, and the speed of moving up and down is 4～8 meters of per minutes.Can form the Fe-AL alloy layer of 50～100 μ m and the aluminum layer about 60 μ m on the surface of steel matrix.
(4), the heat exchanger tube after the process hot dip aluminum plating moves on at once and carries out slow cooling in the holding furnace, the holding furnace preheating temperature is 200 ℃, the temperature of this moment tube bank nearly 700 ℃ put into holding furnace after, temperature can reach about 680 ℃ in the stove, be incubated gentle slow cool down with this understanding, because temperature is higher in the holding furnace, can quicken fine aluminium surface and atmospheric oxidation, form fine and close AL
2O
3Passivation film.
(5), for eliminating the unrelieved stress after the heat exchanger tube processing, proof stress corrosive process farthest eliminates stress by aluminizing, and also will make the steel matrix not produce phase transformation.The way of taking is: the salt pot temperature is controlled in 710 ℃, and the treatment time of tube bank in salt pan is 2 hours; The aluminum pot temperature is controlled in 720 ℃, and the treatment time of tube bank in aluminum pot is 30 minutes; Temperature was controlled at 680 ℃ after the inherent workpiece of holding furnace advanced stove, was incubated 3 hours 30 minutes; Tube bank is about 6 hours of operation under 680～720 ℃ temperature in above equipment, and according to thermal treatment scientific principle opinion, steel construction piece can be realized high temperature Full Annealing, and don't changes metallographic structure; Move to aluminum pot in tube bank from salt pan, when aluminum pot moves to holding furnace again, when proposing, tube bank just carrys additionally stay-warm case from top to bottom from pot, make tube bank not be exposed among the air, temperature in the stay-warm case is controlled at about 650 ℃, guarantee that tube bank is not subjected to room temperature influence in moving process, and produce secondary stress.；
(6), guarantee the technical scheme that plating assistant agent did not lose efficacy: heat exchanger tube is after alkali cleaning, pickling, washing, and surface irregularities and iron scale have been removed totally, handles for avoiding secondary oxidation to carry out plating assistant agent.Handle back tube bank carrying out preheat requirements for adapting to plating assistant agent, the formula constituent of plating assistant agent is: NaCL 3%, KCL 3%, ZnCL 91%, NaF 3%, the passive film that this plating assistant agent forms can guarantee not lose efficacy in the time of 500 ℃, and the plating assistant agent temperature is controlled at more than 90 ℃, and concentration is saturated solution.
(7), for guaranteeing that heat exchanger tube coating is comprehensive, even, the technical scheme at no dead angle: inside and outside making tube bank, do not produce plating leakage and thickness of coating uniformity, increase the flowability of fused salt, the lower fused salt of preparation fusing point is because the treatment temp of fused salt is higher, to increase its flowability.Taking the fused salt fusing point is 640 ℃, and treatment temp is 680～710 ℃, so good flowability is arranged, guarantees that each working face of tube bank all fully contacts with fused salt uniformly; No matter be within salt pan or aluminum pot, all to make tube bank the rotation with the state of moving up and down under contact with saline solution, aluminium liquid, guarantee the uniformity of various components in the salt pan, the uniform distribution of the interior ferroaluminium of aluminum pot, because the result of relative movement, make fused liquid touch each position of tube bank, do not produce plating leakage and guarantee that thickness of coating is even; For guaranteeing the salt pan cleaning, the high melting compound that salt and iron, salt and aluminium produce in the minimizing saline solution, avoid these compounds attached to the tube bank surface, influence quality of coating, handle at the tube bank salt bath and to add 2～5% magnesium fluoride in forward direction salt pan or the aluminum pot, its effect is to react with various impurity, forms on the larger particles to float on the saline solution surface, simultaneously these is floated on the saline solution surface compound and in time pulls out; Because aluminium and iron can react to each other, in aluminum pot, generate ferroaluminium impurity, bigger to surperficial quality of coating influence, easily cause uneven coating to spare, loosen, have defectives such as hole, ferroaluminium impurity proportion is bigger, sink to aluminium liquid bottom more, so bigger to the quality of coating influence of tube bank bottom, for eliminating this phenomenon, before the plating tube bank, to drag for slag, and to carry out repeatedly repeatedly, thoroughly remove be suspended on the saline solution or aluminium liquid among impurity;
(8), control temperature stress, the technical scheme of assurance heat exchanger tube geometrical dimension and shape: temperature stress mainly is created in tube bank preheating and two operations of slow cooling; Unbalance stress also can produce the distortion of tube bank under the high temperature, mainly is created in salt bath and two operations of aluminizing.Be the distortion avoid these reasons to produce, the way of employing is: appropriate design preheating oven structure, the temperature head control that makes tube bank outer tube and inner tube when preheating within limits.Adopt the heating of vertical preheating oven and electrothermal tube, electrothermal tube be distributed as that bottom distributes and the furnace wall distribution combines, the total power of electrothermal tube is 100KW, bottom 60KW, furnace wall 40KW.The internal heat air circulating system is set in preheating oven, and the hot blast that temperature is high is extracted out from the bottom, carries downwards by pipeline; Electrothermal tube is divided into 3 groups of controls, and the bottom is one group, and the furnace wall part is two groups.The preheating scheme is: before tube bank did not add preheating oven, preheating oven carried out preheating earlier, puts into workpiece when preheating temperature reaches 200 ℃, and to bottom heating tube energising, carried out hot air circulation, behind the heating certain hour, and then the furnace wall heating tube was switched on.The temperature of 3 thermocouple measurements tube banks is installed in the preheating oven, and 3 thermopairs contact respectively in outermost layer, middle layer and the innermost layer of tube bank, by control energising and power off time, make interior, in, the temperature difference of outer 3 thermopairs is not more than 50 ℃.In the furnace wall of preheating oven, disrance sleeve is installed, to reduce the direct radiation of electric heating tube to the tube bank outer tube.Tube bank after leer must guarantee to aluminize is slowly cooled off, put into leer beginning 3 and a half hours in tube bank, guarantee 680 ℃ of homo(io)thermism of furnace temperature, begin slow cooling after 3 and a half hours, slow cooling speed is 100 ℃/hour, the temperature difference of tube bank outer tube, intervalve, inner tube is controlled at below 40 ℃, leer is vertical structure, add good thermal insulation layer, leer is installed internal circulation apparatus, and circulation wind-force can not be excessive, the interior hot blast sluggish flow of stove is got final product, when cooling temperature reaches 100 ℃, open bell gradually, the tube bank cool to room temperature is proposed in stove.Tube bank is at salt bath or when aluminizing, owing to all be immersed in the same temperature liquid, internal-external temperature difference is little, can not produce temperature stress, cause viscous deformation, but produce owing to tube bank can not keep the vertical additional bending moment that produces when hanging for avoiding, the suspender of tube bank must carry out mechanical workout, make the boatswain chair can the maintenance level, it is vertical that tube bank keeps.Technique scheme is to carry out under the stable prerequisite of aluminum pot, salt pan heat supply, when the plating heat exchanger tube, must strict requirement be arranged to fuel oil quality, equipment operation condition.
Claims (2)
1, a kind of integrally hot-dip aluminized heat exchanger, it is characterized in that: adopt steel to produce heat exchanger tube by existing method, to restrain integral body again and carry out hot dip aluminum plating, and make the parts such as heat transfer tube, tube sheet, traverse baffle of tube bank under the same process condition, plate the aluminized coating protective treatment simultaneously.
2, integrally hot-dip aluminized heat exchanger according to claim 1 is characterized in that: technical process is: tube bank manufacturing → pre-treatment → help and plate processing → heat-insulation preheating → fused salt processing → hot dip aluminum plating $→ insulation slow cooling → aftertreatment → packing;
(1), the aluminize time of heat exchanger tube in aluminum pot is 20～30 minutes, the temperature of aluminizing is controlled between 690～710 ℃;
(2), adopt two-bath process and, in salt pan, thorough salt bath carried out in tube bank and handle steel matrix wetting property fused salt prescription preferably, the fused salt prescription is: NaCL 43%, KCL 37%, Na
3ALF
616%, ALF
34%, the fused salt fusing point is 640 ℃, and salt bath is to carry out in salt pan;
(3), when aluminizing, tube bank is rotated and moves up and down, speed of rotation is per minute two circles, and the speed of moving up and down is 4～8 meters of per minutes; Can form the Fe-AL alloy layer of 50～100 μ m and the aluminum layer of 50～70 μ m on the surface of steel matrix;
(4), the heat exchanger tube after the process hot dip aluminum plating moves on at once and carries out slow cooling in the holding furnace, the holding furnace preheating temperature is 200 ℃, the temperature of this moment tube bank be 680～700 ℃ put into holding furnace after, temperature can reach 670～680 ℃ in the stove, be incubated gentle slow cool down with this understanding, because temperature is higher in the holding furnace, can quicken fine aluminium surface and atmospheric oxidation, form fine and close AL
2O
3Passivation film;
(5), for eliminating the unrelieved stress after the tube bank processing, the salt pot temperature is controlled in 710 ℃, the treatment time of heat exchanger tube in salt pan is 2 hours; The aluminum pot temperature is controlled in 720 ℃, and the treatment time of tube bank in aluminum pot is 30 minutes; Temperature was controlled at 680 ℃ after the inherent workpiece of holding furnace advanced stove, was incubated 3 hours 30 minutes; Tube bank is operation 6 hours under 680～720 ℃ temperature in above equipment, realizes high temperature Full Annealing, does not change metallographic structure;
(6), move to aluminum pot from salt pan, when aluminum pot moves to holding furnace again, just carry additionally stay-warm case from top to bottom from pot when tube bank proposes, tube bank is not exposed among the air, the temperature in the stay-warm case is controlled at 640～660 ℃ at heat exchanger tube;
(7), handle the back heat exchanger tube and carry out preheat requirements, the formula constituent of plating assistant agent is for adapting to plating assistant agent: NaCL 3%, KCL 3%, ZnCL 91%, NaF 3%, and the plating assistant agent temperature is controlled at more than 90 ℃, and concentration is saturated solution;
(8), do not produce plating leakage and thickness of coating uniformity inside and outside the heat exchanger tube, increase the flowability of fused salt, preparation fused salt fusing point is 640 ℃, and treatment temp is 680～710 ℃ for guaranteeing; Tube bank contacts with saline solution, aluminium liquid under rotation and the state of moving up and down, and guarantees the uniform distribution of ferroaluminium in the uniformity, aluminum pot of various components in the salt pan; Handle at the tube bank salt bath and to add 2～5% magnesium fluoride in forward direction salt pan or the aluminum pot, and thoroughly remove be suspended on the saline solution or aluminium liquid among impurity;
(9), for the control temperature stress, guarantee heat exchanger tube geometrical dimension and shape, adopt the heating of vertical preheating oven and electrothermal tube, electrothermal tube be distributed as that bottom distributes and the furnace wall distribution combines, the total power of electrothermal tube is 100KW, bottom 60KW, furnace wall 40KW; The internal heat air circulating system is set in preheating oven, and the hot blast that temperature is high is extracted out from the bottom, carries downwards by pipeline; Electrothermal tube is divided into 3 groups of controls, and the bottom is one group, and the furnace wall part is two groups; Preheating: before tube bank did not add preheating oven, preheating oven carried out preheating earlier, puts into workpiece when preheating temperature reaches 200 ℃, and to the energising of bottom heating tube, carried out hot air circulation, and then the furnace wall heating tube is switched on; The temperature of 3 thermocouple measurements tube banks is installed in the preheating oven, and 3 thermopairs contact respectively in outermost layer, middle layer and the innermost layer of tube bank, by control energising and power off time make interior, in, the temperature difference of outer 3 thermopairs is not more than 50 ℃; In the furnace wall of preheating oven, disrance sleeve is installed, to reduce the direct radiation of electric heating tube to the tube bank outer tube; Tube bank after leer must guarantee to aluminize is slowly cooled off, put into leer beginning 3 and a half hours in tube bank, guarantee 680 ℃ of homo(io)thermism of furnace temperature, begin slow cooling after 3 and a half hours, slow cooling speed is 100 ℃/hour, and the temperature difference of tube bank outer tube, intervalve, inner tube is controlled at below 40 ℃, when cooling temperature reaches 100 ℃, open bell gradually, the tube bank cool to room temperature is proposed in stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02109108 CN1381607A (en) | 2002-01-29 | 2002-01-29 | Integrally hot-dip aluminized heat exchanger and its technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02109108 CN1381607A (en) | 2002-01-29 | 2002-01-29 | Integrally hot-dip aluminized heat exchanger and its technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1381607A true CN1381607A (en) | 2002-11-27 |
Family
ID=4740497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02109108 Pending CN1381607A (en) | 2002-01-29 | 2002-01-29 | Integrally hot-dip aluminized heat exchanger and its technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1381607A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102301030A (en) * | 2009-01-27 | 2011-12-28 | 安德里茨水电有限公司 | Apparatus and method for producing workpieces having a surface made of rust-proof metal |
| CN102560313A (en) * | 2012-02-15 | 2012-07-11 | 北京海泰锐森环境能源技术开发有限公司 | Hot dip aluminum plating method for steel structure member |
| CN104805388A (en) * | 2013-12-05 | 2015-07-29 | 绵阳快典科技有限公司 | Coating zinc-plating device for external wall of steel pipe |
| CN106141351A (en) * | 2016-08-01 | 2016-11-23 | 安徽贝莱电子科技有限公司 | A kind of salt bath brazing technique of radar antenna |
| CN106244965A (en) * | 2016-07-29 | 2016-12-21 | 全椒赛德利机械有限公司 | A kind of hot dipping alumetizing process of steel radiator |
| CN108486520A (en) * | 2018-05-29 | 2018-09-04 | 佛山市高明利钢精密铸造有限公司 | A kind of preparation method with high-compactness aluminized coating alumetized steel |
| CN108660413A (en) * | 2018-05-29 | 2018-10-16 | 佛山市高明利钢精密铸造有限公司 | A kind of manufacturing method of alumetized steel |
| CN110542643A (en) * | 2018-06-06 | 2019-12-06 | 中昊清远(北京)科技有限公司 | Corrosion and aging test equipment for simulating marine multi-zone environment |
-
2002
- 2002-01-29 CN CN 02109108 patent/CN1381607A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102301030A (en) * | 2009-01-27 | 2011-12-28 | 安德里茨水电有限公司 | Apparatus and method for producing workpieces having a surface made of rust-proof metal |
| CN102560313A (en) * | 2012-02-15 | 2012-07-11 | 北京海泰锐森环境能源技术开发有限公司 | Hot dip aluminum plating method for steel structure member |
| CN104805388A (en) * | 2013-12-05 | 2015-07-29 | 绵阳快典科技有限公司 | Coating zinc-plating device for external wall of steel pipe |
| CN104911521A (en) * | 2013-12-05 | 2015-09-16 | 绵阳快典科技有限公司 | Inner bore avoidance steel pipe coating galvanization device |
| CN104911521B (en) * | 2013-12-05 | 2017-06-20 | 甘肃天和力德管道制造有限公司 | A kind of endoporus keeps away the steel pipe coating galvanizing rig of position |
| CN106244965A (en) * | 2016-07-29 | 2016-12-21 | 全椒赛德利机械有限公司 | A kind of hot dipping alumetizing process of steel radiator |
| CN106141351A (en) * | 2016-08-01 | 2016-11-23 | 安徽贝莱电子科技有限公司 | A kind of salt bath brazing technique of radar antenna |
| CN108486520A (en) * | 2018-05-29 | 2018-09-04 | 佛山市高明利钢精密铸造有限公司 | A kind of preparation method with high-compactness aluminized coating alumetized steel |
| CN108660413A (en) * | 2018-05-29 | 2018-10-16 | 佛山市高明利钢精密铸造有限公司 | A kind of manufacturing method of alumetized steel |
| CN108486520B (en) * | 2018-05-29 | 2020-07-28 | 佛山市高明利钢精密铸造有限公司 | Preparation method of aluminized steel with high-density aluminized layer |
| CN110542643A (en) * | 2018-06-06 | 2019-12-06 | 中昊清远(北京)科技有限公司 | Corrosion and aging test equipment for simulating marine multi-zone environment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101660116A (en) | Hot dipping alumetizing process of steel radiator | |
| CN101379362B (en) | Corrosion resistant material for reduced fouling, heat transfer component with improved corrosion and fouling resistance, and method for reducing fouling | |
| Arai | Carbide coating process by use of molten borax bath in Japan | |
| CN109821951A (en) | A kind of preparation method and device of corrosion-resistant drop stamping part | |
| US2300400A (en) | Heat corrosion resistant metallic material | |
| JPS61184395A (en) | Corrosion preventive process for aluminum heat exchanger | |
| Gao et al. | Effect of laser cladding speed on microstructure and properties of titanium alloy coating on low carbon steel | |
| CN1381607A (en) | Integrally hot-dip aluminized heat exchanger and its technology | |
| CN110004392B (en) | High-temperature corrosion-resistant wear-resistant amorphous thermal spraying material | |
| CN110499485A (en) | A kind of alloying processing method preparing high anti-powdering hot dip galvanizing coating | |
| CN111074194B (en) | Remelting method in boiler membrane type water-cooled wall heating surface anticorrosive coating atmosphere furnace | |
| CN1687480A (en) | Technique for manufacturing whole hot dip aluminizing heat exchanger (tube tank) | |
| CN107686932A (en) | A kind of corrosion resistance spheroidal graphite cast-iron and its casting heat invade aluminum plating process | |
| CN103243286B (en) | A kind of method of metal works vacuum hot-dip plating aluminum or aluminum alloy and device thereof | |
| Hu et al. | Thermal shock behaviour and failure mechanism of two-kind Cr coatings on non-planar structure | |
| WO2017159054A1 (en) | Member formed from aluminum alloy and lng vaporizer | |
| CN101724802B (en) | Method for hot melting and aluminizing large steel | |
| CN1204280C (en) | High-chromium nickel-base alloy and produced spraying wire and its application | |
| Keong | Crystallisation Kinetics and Phase Transformation Behaviour of Electroless Nickel-Phosphorus Deposit with 6-9wt% Phosphorus Content | |
| CN113337791B (en) | Preparation method of thermal barrier coating for boiler protection | |
| CN1097816A (en) | Surface intensifying treatment method for high corrosion-resistance wear-resistance oil pump | |
| CN108676391B (en) | High-temperature-resistant zinc-plated aluminum-zinc-plated coating and preparation method thereof | |
| CN102124149A (en) | Method for removing brazing residues from aluminum articles | |
| CN1275717C (en) | Technique for manufacturing hot dip aluminizing heat exchanger | |
| CN1584101A (en) | Preparation for iron-aluminium intermetallic compound coating on iron-steel surface and thermal treating method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |