CN104726914B - A kind of surface treatment method of heating furnace heat exchange coil - Google Patents
A kind of surface treatment method of heating furnace heat exchange coil Download PDFInfo
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- CN104726914B CN104726914B CN201510032903.2A CN201510032903A CN104726914B CN 104726914 B CN104726914 B CN 104726914B CN 201510032903 A CN201510032903 A CN 201510032903A CN 104726914 B CN104726914 B CN 104726914B
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Abstract
The present invention relates to a kind of surface treatment method of heating furnace heat exchange coil.A kind of surface treatment method of heating furnace heat exchange coil, comprises the following steps：The heat exchange coil that need to be handled is placed in immersion treatment in weak acid solution A, the oxide of surfaces externally and internally is removed；Prepare the electric depositing solution B containing Cr：By the heat exchange coil one end treated in previous step sealing, electric depositing solution B is injected in heat exchange coil by the other end, using heat exchange coil as negative electrode, metal anode is inserted in coil pipe and carries out electro-deposition；The heat exchange coil that previous step is treated cancels sealing and is placed into annealing in vacuum drying oven, obtains the Cr layers of inner surface nanosizing；Heat exchange coil after previous step is made annealing treatment is placed in weak acid solution A and handled, and removes the oxide of surfaces externally and internally；Heat exchange coil two ends sealing after previous step is handled, keeps no moisture in heat exchange coil, heat exchange coil is placed in hydrothermal reaction kettle and carries out hydro-thermal process, obtain nanosizing outer surface of tube wall structure.
Description
Technical field
The invention belongs to coil surface processing method field, and in particular to a kind of surface treatment side of heating furnace heat exchange coil
Method.
Background technology
In oil gas field particularly gas exploitation production, in order to avoid natural gas forms hydration in gathering system
Thing, generally requires to preheat natural gas by heating furnace, improves more than natural gas temperature to water dew point.It is the most frequently used at present
Heating furnace based on water jacket furnace, the basic structure of water jacket furnace mainly includes cylinder, heating coil, fiery cylinder, smoke pipe, chimney and combustion
Several parts such as burner.Heating coil is arranged in the upper space of housing, in order in limited space, increase coil heat exchange surface
Product, typically using snakelike steel tube.
But water batch heater domestic at present is influenceed by heat exchange material, while serpentine coil is limited by furnace interior structure
Can not infinitely it increase, often the thermal efficiency is relatively low, and thermal efficiency of heating furnace problem affects the energy-saving work of oil gas field and economy
Benefit, therefore, the method that research improves Tube in Furnace heat exchange area have most direct work for improving thermal efficiency of heating furnace
Journey application value.
The content of the invention
It is an object of the invention to for WATER JACKET HEATER OF OIL AND GAS FIELD heat exchange coil heat exchange efficiency present in prior art
Relatively low the problem of, provides a kind of processing method of heat exchange coil making Nano surface.
The technical scheme is that：
A kind of surface treatment method of heating furnace heat exchange coil, the heat exchange coil is snakelike steel coil pipe, heat exchange coil
Surfaces externally and internally has by the nanocrystalline compacted zone constituted that thickness is about 500 nanometers, comprises the following steps：
（1）The heat exchange coil that need to be handled is placed in immersion treatment in weak acid solution A, the oxide of surfaces externally and internally is removed；
（2）Prepare the electric depositing solution B containing Cr：
（3）By step（1）In treat heat exchange coil one end sealing, above-mentioned electric depositing solution B is injected by the other end
In heat exchange coil, using heat exchange coil as negative electrode, metal anode is inserted in coil pipe and carries out electro-deposition；
（4）By step（3）Treated heat exchange coil cancels sealing and is placed into annealing in vacuum drying oven, obtains inner surface
The Cr layers of nanosizing；
（5）By step（4）Heat exchange coil after annealing is again placed in handling in weak acid solution A, removes again inside and outside
The oxide on surface；
（6）By step（5）Heat exchange coil two ends sealing after processing, keeps no moisture in heat exchange coil, by heat exchange coil
It is placed in hydrothermal reaction kettle and carries out hydro-thermal process, obtains nanosizing outer surface of tube wall structure.
Specifically, the step（1）And step（5）In weak acid solution A be oxalic acid of the pH value between 1 ~ 5, boric acid or
The weak acid solution of one or more of mixing in citric acid etc..
Specifically, the step（2）Middle electric depositing solution B preparation methods are：In water add concentration be 200g/L ~
260g/L CrO3With 0.2g/L ~ 1g/L boric acid, it is heated to 50 DEG C ~ 55 DEG C and continuously stirs, use dilute H2SO4PH value is adjusted to 2
Between ~ 4.
Specifically, the step（3）In electro-deposition method be, using coil pipe as negative electrode, to be inserted by anode of Pt metal or Pb
Electro-deposition is carried out in heat exchange coil, its current density is 50A/dm2~60A/dm2Between, sedimentation time 30min ~ 120min it
Between.
Specifically, the step（4）Vacuum drying oven is warming up to 500 DEG C ~ 700 DEG C simultaneously in annealing process in a vacuum furnace
10min ~ 60min is incubated, stops heating afterwards, coil pipe is then cooled to room temperature.
Specifically, the step（6）Middle heat exchange coil is placed in hydrothermal reaction kettle, according to actual conditions in hydrothermal reaction kettle
The water of addition certain volume is needed, is warming up between 100 DEG C ~ 200 DEG C, insulation is taken out after 5 hours ~ 14 hours.
The present invention is prepared for using the process of annealing assist in electrodeposition in the inner surface of water batch heater heat exchange coil
Cr layers of nanometer, using the process of hydro-thermal process, nano-sized iron oxide is prepared in the outer surface of water batch heater heat exchange coil
Layer, has been respectively increased the relative heat exchange area of surfaces externally and internally, is conducive to improving heating furnace heat exchange coil heat exchange efficiency, while interior table
The Cr layers in face have corrosion resistance simultaneously.The present invention can be able to extensively should in oil gas field gathering station heating furnace manufacture field
With the corrosion resistance of raising coil pipe while thermal efficiency of heating furnace is lifted.
Brief description of the drawings
Fig. 1 is the heat exchange coil outer surface of tube wall structure after the processing method processing that the present invention is provided；
Fig. 2 is the heat exchange coil inner surface of tube wall structure after the processing method processing that the present invention is provided.
Embodiment
The present invention provides a kind of surface treatment method of heating furnace heat exchange coil, and the heat exchange coil is snakelike steel disk
Pipe, heat exchange coil surfaces externally and internally has by the nanocrystalline compacted zone constituted that thickness is about 500 nanometers,
Embodiment 1
A kind of its processing procedure of the surface treatment method of heating furnace heat exchange coil comprises the following steps：
（1）Oxalic acid is added to the water, the weak acid solution A that pH value is 3 is made into, is that 200mm, specification are DN100's by length
Heat exchange coil described in A333 is placed in dipping pretreatment 2 hours in previous solu A, removes the oxide of surfaces externally and internally.
（2）Prepare electric depositing solution B：The CrO that concentration is 260g/L is added in water3With 1g/L boric acid, 55 are heated to
DEG C and continuously stir, use dilute H2SO4It is 4 to adjust pH value；
（3）Sealed with the coil pipe one end treated in step 1 with Teflon stopper, above-mentioned electroplating solution B is passed through
In coil pipe openend injection coil pipe, using coil pipe as negative electrode, diameter 10mm, long 100mm metal Pb rods are inserted in coil pipe as
Electro-deposition is carried out for anode, current density is 60A/dm2, sedimentation time 90min；
（4）The coil pipe that step 3 is treated is cancelled sealing and is placed into vacuum drying oven, is warming up to 500 DEG C and is incubated 30min,
Stop heating afterwards, coil pipe is cooled to room temperature, obtain the Cr layers of inner surface nanosizing（Fig. 2）；
（5）Coil pipe after step 4 is annealed is again placed in handling in weak solution A, removes the oxide of surfaces externally and internally；
（6）Coil pipe two ends after step 5 is handled are sealed with Teflon stopper, no moisture in pipe are kept, by coil pipe
It is placed in hydrothermal reaction kettle, needs the water of addition certain volume in hydrothermal reaction kettle according to actual conditions, is warming up to 200 DEG C, guarantor
Temperature is taken out after 12 hours, obtains nanosizing outer surface of tube wall structure（Fig. 1）.
It is can be seen that from Fig. 1, Fig. 1 by surface treatment, fine and close nano-layer structure is presented in heat exchange coil surface, improves
Relative surface area.
Embodiment 2
From step unlike embodiment 1（1）The PH that middle weak acid solution A is added to the water modulation by citric acid is 5
Weak acid solution；
Step（2）Middle electric depositing solution B is that the CrO that concentration is 230g/L is added in water3With 0.6g/L boric acid, heating
To 50 DEG C and continuously stir, use dilute H2SO4Adjust the electric depositing solution that pH value is 3；
Step（3）In use Pt metal, current density is 55A/dm2, sedimentation time 120min；
Step（4）In be warming up to 700 DEG C and be incubated 60min, stop heating afterwards, coil pipe be cooled to room temperature；
Step（6）In middle hydrothermal reaction kettle according to actual conditions need add certain volume water, be warming up to 150 DEG C it
Between, insulation is taken out after 5 hours.
Nanometer layer on the surfaces externally and internally of the heat exchange coil drawn is finer and close.
Finally it should be noted that:The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
The embodiment of the present invention can be modified or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical scheme, it all should cover among claimed technical scheme scope of the invention.
Claims (6)
1. a kind of surface treatment method of heating furnace heat exchange coil, the heat exchange coil is in snakelike steel coil pipe, heat exchange coil
Outer surface has by the nanocrystalline compacted zone constituted that thickness is about 500 nanometers, it is characterised in that comprise the following steps：
（1）The heat exchange coil that need to be handled is placed in immersion treatment in weak acid solution A, the oxide of surfaces externally and internally is removed；
（2）Prepare the electric depositing solution B containing Cr：
（3）By step（1）In treat heat exchange coil one end sealing, by above-mentioned electric depositing solution B by the other end inject exchange heat
In coil pipe, using heat exchange coil as negative electrode, metal anode is inserted in coil pipe and carries out electro-deposition；
（4）By step（3）Treated heat exchange coil cancels sealing and is placed into annealing in vacuum drying oven, obtains inner surface nanometer
The Cr layers of change；
（5）By step（4）Heat exchange coil after annealing is again placed in handling in weak acid solution A, and surfaces externally and internally is removed again
Oxide；
（6）By step（5）Heat exchange coil two ends sealing after processing, keeps no moisture in heat exchange coil, heat exchange coil is placed in
Hydro-thermal process is carried out in hydrothermal reaction kettle, nanosizing outer surface of tube wall structure is obtained.
2. a kind of surface treatment method of heating furnace heat exchange coil according to claim 1, it is characterised in that the step
（1）In weak acid solution A be pH value in the oxalic acid between 1 ~ 5, boric acid or citric acid one or more of mixing weak acid it is molten
Liquid.
3. a kind of surface treatment method of heating furnace heat exchange coil according to claim 1, it is characterised in that the step
（2）Middle electric depositing solution B preparation methods are：The CrO that concentration is 200g/L ~ 260g/L is added in water3With 0.2g/L ~ 1g/L's
Boric acid, is heated to 50 DEG C ~ 55 DEG C and continuously stirs, use dilute H2SO4PH value is adjusted between 2 ~ 4.
4. a kind of surface treatment method of heating furnace heat exchange coil according to claim 1, it is characterised in that the step
（3）In electro-deposition method be, using coil pipe as negative electrode, electro-deposition to be carried out in insertion heat exchange coil by anode of Pt metal or Pb, its
Current density is 50A/dm2~60A/dm2Between, sedimentation time is between 30min ~ 120min.
5. a kind of surface treatment method of heating furnace heat exchange coil according to claim 1, it is characterised in that the step
（4）Vacuum drying oven is warming up to 500 DEG C ~ 700 DEG C in annealing process in a vacuum furnace and 10min ~ 60min is incubated, Zhi Houting
Only heat, coil pipe is then cooled to room temperature.
6. a kind of surface treatment method of heating furnace heat exchange coil according to claim 1, it is characterised in that the step
（6）Middle heat exchange coil is placed in hydrothermal reaction kettle, needs the water of addition certain volume in hydrothermal reaction kettle according to actual conditions, is risen
Between warm to 100 DEG C ~ 200 DEG C, insulation is taken out after 5 hours ~ 14 hours.
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| CN201510032903.2A CN104726914B (en) | 2015-01-23 | 2015-01-23 | A kind of surface treatment method of heating furnace heat exchange coil |
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| CN201510032903.2A CN104726914B (en) | 2015-01-23 | 2015-01-23 | A kind of surface treatment method of heating furnace heat exchange coil |
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| CN104726914B true CN104726914B (en) | 2017-09-29 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2139687Y (en) * | 1992-11-24 | 1993-08-04 | 刘志成 | Heat-exchanger of gas water heater with black chrome plating |
| WO1999062654A1 (en) * | 1998-06-01 | 1999-12-09 | Afatec S.R.L. | Bimetallic corrugated tube and process for its manufacturing |
| CN2541703Y (en) * | 2002-04-10 | 2003-03-26 | 裴国喜 | Copper type plated with strengened metal layer |
| CN101974773A (en) * | 2010-11-11 | 2011-02-16 | 山东电力研究院 | Method for improving stress corrosion resistance of Incone1609 alloy heat transfer tube |
| CN103882414A (en) * | 2014-03-17 | 2014-06-25 | 美的集团股份有限公司 | Aluminium-pipe heat exchanger and surface treatment method |
| CN104005015A (en) * | 2014-06-12 | 2014-08-27 | 哈尔滨工业大学 | Method for conducting in-situ growth of alpha-Fe2O3 nano arrays on surface of steel |
| CN104117833A (en) * | 2014-07-01 | 2014-10-29 | 北京全四维动力科技有限公司 | Porous hydrophilic stainless steel heat exchange tube and surface treatment method thereof |
-
2015
- 2015-01-23 CN CN201510032903.2A patent/CN104726914B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2139687Y (en) * | 1992-11-24 | 1993-08-04 | 刘志成 | Heat-exchanger of gas water heater with black chrome plating |
| WO1999062654A1 (en) * | 1998-06-01 | 1999-12-09 | Afatec S.R.L. | Bimetallic corrugated tube and process for its manufacturing |
| CN2541703Y (en) * | 2002-04-10 | 2003-03-26 | 裴国喜 | Copper type plated with strengened metal layer |
| CN101974773A (en) * | 2010-11-11 | 2011-02-16 | 山东电力研究院 | Method for improving stress corrosion resistance of Incone1609 alloy heat transfer tube |
| CN103882414A (en) * | 2014-03-17 | 2014-06-25 | 美的集团股份有限公司 | Aluminium-pipe heat exchanger and surface treatment method |
| CN104005015A (en) * | 2014-06-12 | 2014-08-27 | 哈尔滨工业大学 | Method for conducting in-situ growth of alpha-Fe2O3 nano arrays on surface of steel |
| CN104117833A (en) * | 2014-07-01 | 2014-10-29 | 北京全四维动力科技有限公司 | Porous hydrophilic stainless steel heat exchange tube and surface treatment method thereof |
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| CN104726914A (en) | 2015-06-24 |
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