CN104726914A - Method for treating surface of heat exchange coil of heat furnace - Google Patents
Method for treating surface of heat exchange coil of heat furnace Download PDFInfo
- Publication number
- CN104726914A CN104726914A CN201510032903.2A CN201510032903A CN104726914A CN 104726914 A CN104726914 A CN 104726914A CN 201510032903 A CN201510032903 A CN 201510032903A CN 104726914 A CN104726914 A CN 104726914A
- Authority
- CN
- China
- Prior art keywords
- heat exchange
- exchange coil
- coil
- inhibiter
- furnace
- 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.)
- Granted
Links
Abstract
The invention relates to a method for treating the surface of a heat exchange oil of a heat furnace. The method comprises the following steps: soaking a to-be-treated heat exchange coil in an acid-deficient solution A to remove oxide on inner and outer surfaces; preparing a Cr-containing electrodepositing solution B, namely sealing one end of the heat exchange coil which is treated in the last step, injecting the electrodepositing solution B into the heat exchange coil from the other end, and inserting a metal anode into the coil by taking the heat exchange coil as a cathode for electrodepositing; thirdly, canceling sealing of the heat exchange coil treated in the last step, and annealing in a vacuum furnace to obtain a Cr layer of which the inner surface is nanocrystallized; fourthly, treating the heat exchange coil which is annealed in the last step in the acid-deficient solution A to remove the oxide on inner and outer surfaces; fifthly, sealing two ends of the heat exchange coil treated in the last step, keeping no moisture in the heat exchange coil, and performing hydrothermal treatment on the heat exchange coil in a hydrothermal reaction kettle to obtain a nano-tube wall outer surface structure.
Description
Technical field
The invention belongs to coil surface treatment process field, be specifically related to a kind of surface treatment method of process furnace heat exchange coil.
Background technology
During particularly gas exploitation is produced at oil-gas field, in order to avoid Sweet natural gas forms hydrate in gathering system, often need to be preheated Sweet natural gas by process furnace, improve more than natural gas temperature to water dew point.Process furnace the most frequently used is at present based on water jacket furnace, and the basic structure of water jacket furnace mainly comprises several parts such as cylindrical shell, heating coil, fiery cylinder, smoke pipe, chimney and burner.Heating coil is arranged in the upper space of housing, in order in limited space, increases coil heat exchange surface-area, generally adopts snakelike steel tube.
But water jacket heater domestic at present affects by heat exchange material, sinuous coil can not infinitely increase by furnace interior structural limitations simultaneously, often thermo-efficiency is lower, and thermal efficiency of heating furnace problems affect oil-gas field and to be saved energy and reduce the cost work and economic benefit, therefore, research improves the method for Tube in Furnace heat interchanging area, has the most direct engineer applied be worth for raising thermal efficiency of heating furnace.
Summary of the invention
The object of the invention is to the treatment process that a kind of heat exchange coil making Nano surface is provided for the problem that the WATER JACKET HEATER OF OIL AND GAS FIELD heat exchange coil heat exchange efficiency existed in prior art is lower.
Technical scheme of the present invention is:
A surface treatment method for process furnace heat exchange coil, described heat exchange coil is snakelike steel coil pipe, and it is the nanocrystalline tight zone formed of about 500 nanometers that heat exchange coil surfaces externally and internally all has by thickness, comprises the steps:
(1) heat exchange coil that need process is placed in weakly acid soln A immersion treatment, the oxide compound of removing surfaces externally and internally;
(2) preparation is containing the electric depositing solution B of Cr:
(3) the heat exchange coil one end sealing will processed in step (1), injects heat exchange coil by above-mentioned electric depositing solution B by the other end, is negative electrode, is inserted by metal anode in coil pipe and carry out galvanic deposit with heat exchange coil;
(4) heat exchange coil cancellation step (3) processed seals and inserts anneal in vacuum oven, obtains the Cr layer of internal surface nanometer;
(5) heat exchange coil after step (4) anneal is placed in weakly acid soln A process again, again removes the oxide compound of surfaces externally and internally;
(6) the heat exchange coil two ends sealing after step (5) being processed, without moisture in maintenance heat exchange coil, is placed in hydrothermal reaction kettle and carries out hydrothermal treatment consists by heat exchange coil, obtain nanometer outer surface of tube wall structure.
Concrete, the weakly acid soln A in described step (1) and step (5) is one or more weakly acid solns mixed in the oxalic acid of pH value between 1 ~ 5, boric acid or citric acid etc.
Concrete, in described step (2), electric depositing solution B preparation method is: in water, add the CrO that concentration is 200g/L ~ 260g/L
3with the boric acid of 0.2g/L ~ 1g/L, be heated to 50 DEG C ~ 55 DEG C and continuously stirring, use rare H
2sO
4between adjustment pH value to 2 ~ 4.
Concrete, the electro-deposition method in described step (3) take coil pipe as negative electrode, and carry out galvanic deposit with Pt metal or Pb for anode inserts in heat exchange coil, its current density is 50A/dm
2~ 60A/dm
2between, depositing time is between 30min ~ 120min.
Concrete, vacuum oven is warming up to 500 DEG C ~ 700 DEG C in annealing process and is incubated 10min ~ 60min by described step (4) in a vacuum furnace, stops heating afterwards, then coil pipe is cooled to room temperature.
Concrete, in described step (6), heat exchange coil is placed in hydrothermal reaction kettle, adds the water of dutycycle 5% ~ 50%, be warming up between 100 DEG C ~ 200 DEG C in hydrothermal reaction kettle, takes out after being incubated 5 hours ~ 14 hours.
The present invention adopts the processing method of annealing assist in electrodeposition to prepare nanometer Cr layer at the internal surface of water jacket heater heat exchange coil, adopt the processing method of hydrothermal treatment consists, nano oxidized iron layer has been prepared at the outside surface of water jacket heater heat exchange coil, improve the relative heat interchanging area of surfaces externally and internally respectively, be conducive to improving process furnace heat exchange coil heat exchange efficiency, the Cr layer of internal surface has corrosion resistance simultaneously simultaneously.The present invention can manufacture field at oil-gas field gathering station field process furnace and be able to widespread use, improves the corrosion resistance of coil pipe while promoting thermal efficiency of heating furnace.
Accompanying drawing explanation
Fig. 1 is the heat exchange coil outer surface of tube wall structure after disposal methods provided by the invention;
Fig. 2 is the heat exchange coil inner surface of tube wall structure after disposal methods provided by the invention.
Embodiment
The invention provides a kind of surface treatment method of process furnace heat exchange coil, described heat exchange coil is snakelike steel coil pipe, and it is the nanocrystalline tight zone formed of about 500 nanometers that heat exchange coil surfaces externally and internally all has by thickness,
Embodiment 1
Its treating processes of surface treatment method of a kind of process furnace heat exchange coil comprises the steps:
(1) oxalic acid is added to the water, is made into the weakly acid soln A that pH value is 3, be 200mm by length, specification is placed in previous solu A dipping pretreatment 2 hours, the oxide compound of removing surfaces externally and internally for heat exchange coil described in the A333 of DN100.
(2) electric depositing solution B is prepared: in water, add the CrO that concentration is 260g/L
3with the boric acid of 1g/L, be heated to 55 DEG C and continuously stirring, use rare H
2sO
4adjustment pH value is 4;
(3) seal with the coil pipe one end Teflon stopper processed in step 1, above-mentioned electroplating solution B is injected coil pipe by coil pipe opening end, take coil pipe as negative electrode, inserted in coil pipe by the metal Pb of diameter 10mm, long 100mm rod and carry out galvanic deposit as anode, current density is 60A/dm
2, depositing time 90min;
(4) coil pipe cancellation step 3 processed seals and inserts in vacuum oven, is warming up to 500 DEG C and is incubated 30min, stopping heating afterwards, coil pipe is cooled to room temperature, obtaining the Cr layer (Fig. 2) of internal surface nanometer;
(5) coil pipe after step 4 being annealed again is placed in weak solution A and processes, the oxide compound of removing surfaces externally and internally;
(6) the coil pipe two ends Teflon stopper after step 5 being processed seals, and without moisture in holding tube, coil pipe is placed in hydrothermal reaction kettle, hydrothermal reaction kettle adds the water of dutycycle 50%, be warming up to 200 DEG C, be incubated after 12 hours and take out, obtain nanometer outer surface of tube wall structure (Fig. 1).
As can be seen from Fig. 1, Fig. 1, through surface treatment, the nanometer layer structure of heat exchange coil surface presentation densification, improves relative surface area.
Embodiment 2
The PH being added to the water modulation unlike weakly acid soln A in step (1) by citric acid with embodiment 1 is the weakly acid soln of 5;
In step (2), electric depositing solution B adds the CrO that concentration is 230g/L in water
3with the boric acid of 0.6g/L, be heated to 50 DEG C and continuously stirring, use rare H
2sO
4adjustment pH value is the electric depositing solution of 3;
Step uses Pt metal in (3), and current density is 55A/dm
2, depositing time 120min;
Be warming up to 700 DEG C in step (4) and be incubated 60min, stopping heating afterwards, coil pipe is cooled to room temperature;
In step (6), hydrothermal reaction kettle adds the water of dutycycle 30%, is warming up between 150 DEG C, is incubated after 5 hours and takes out.
Nanometer layer on the surfaces externally and internally of the heat exchange coil drawn is finer and close.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (6)
1. a surface treatment method for process furnace heat exchange coil, described heat exchange coil is snakelike steel coil pipe, and it is the nanocrystalline tight zone formed of about 500 nanometers that heat exchange coil surfaces externally and internally all has by thickness, it is characterized in that, comprises the steps:
(1) heat exchange coil that need process is placed in weakly acid soln A immersion treatment, the oxide compound of removing surfaces externally and internally;
(2) preparation is containing the electric depositing solution B of Cr:
(3) the heat exchange coil one end sealing will processed in step (1), injects heat exchange coil by above-mentioned electric depositing solution B by the other end, is negative electrode, is inserted by metal anode in coil pipe and carry out galvanic deposit with heat exchange coil;
(4) heat exchange coil cancellation step (3) processed seals and inserts anneal in vacuum oven, obtains the Cr layer of internal surface nanometer;
(5) heat exchange coil after step (4) anneal is placed in weakly acid soln A process again, again removes the oxide compound of surfaces externally and internally;
(6) the heat exchange coil two ends sealing after step (5) being processed, without moisture in maintenance heat exchange coil, is placed in hydrothermal reaction kettle and carries out hydrothermal treatment consists by heat exchange coil, obtain nanometer outer surface of tube wall structure.
2. a kind of inhibiter pretreatment process according to claim 1, is characterized in that, the weakly acid soln A in described step (1) is weakly acid solns of one or more mixing in the oxalic acid of pH value between 1 ~ 5, boric acid or citric acid etc.
3. a kind of inhibiter pretreatment process according to claim 1, is characterized in that, in described step (2), electric depositing solution B preparation method is: in water, add the CrO that concentration is 200g/L ~ 260g/L
3with the boric acid of 0.2g/L ~ 1g/L, be heated to 50 DEG C ~ 55 DEG C and continuously stirring, use rare H
2sO
4between adjustment pH value to 2 ~ 4.
4. a kind of inhibiter pretreatment process according to claim 1, it is characterized in that, the electro-deposition method in described step (3) take coil pipe as negative electrode, and carry out galvanic deposit with Pt metal or Pb for anode inserts in heat exchange coil, its current density is 50A/dm
2~ 60A/dm
2between, depositing time is between 30min ~ 120min.
5. a kind of inhibiter pretreatment process according to claim 1, it is characterized in that, vacuum oven is warming up to 500 DEG C ~ 700 DEG C in annealing process and is incubated 10min ~ 60min by described step (4) in a vacuum furnace, stops heating afterwards, then coil pipe is cooled to room temperature.
6. a kind of inhibiter pretreatment process according to claim 1, it is characterized in that, in described step (6), heat exchange coil is placed in hydrothermal reaction kettle, adds the water of dutycycle 5% ~ 50% in hydrothermal reaction kettle, be warming up between 100 DEG C ~ 200 DEG C, take out after being incubated 5 hours ~ 14 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510032903.2A CN104726914B (en) | 2015-01-23 | 2015-01-23 | A kind of surface treatment method of heating furnace heat exchange coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510032903.2A CN104726914B (en) | 2015-01-23 | 2015-01-23 | A kind of surface treatment method of heating furnace heat exchange coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104726914A true CN104726914A (en) | 2015-06-24 |
| CN104726914B CN104726914B (en) | 2017-09-29 |
Family
ID=53451314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510032903.2A Active CN104726914B (en) | 2015-01-23 | 2015-01-23 | A kind of surface treatment method of heating furnace heat exchange coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104726914B (en) |
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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104726914B (en) | 2017-09-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103521548B (en) | The preparation method of a kind of martensite steel pipe | |
| CN103173833B (en) | One kind improves the corrosion proof anodization enclosure method of aluminium alloy | |
| CN102330095B (en) | Preparation method of Al2O3 coating on surface of steel-matrix material | |
| CN112064043B (en) | Method for removing oxide film on surface of iron-chromium-aluminum wire rod and heating container | |
| CN104324974B (en) | The finely finishing method of titanium alloy seamless pipe | |
| CN104726914A (en) | Method for treating surface of heat exchange coil of heat furnace | |
| CN103132122B (en) | Steel wire on-line normal-temperature electrolytic phosphatization method | |
| CN107345288A (en) | A kind of manufacture method of nuclear power generating equipment steel and its forging | |
| CN105714082A (en) | Bright annealing process for seamless steel tube | |
| CN102154618A (en) | Method and device for alumetizing with alternating current electric field enhanced powder method | |
| CN106356187B (en) | Ooze dysprosium technique in a kind of neodymium iron boron surface | |
| CN203144511U (en) | Pyrolysis furnace for preparing nickel rod by chemical vapour deposition method | |
| CN106757236A (en) | Improve the method and palladium film layer of stainless steel surfaces palladium film layer decay resistance | |
| CN209778926U (en) | high-temperature annealing equipment for micro-motor punching sheet | |
| CN102022950B (en) | Anticorrosive processing method for aluminum-alloy heat-exchanger water pipe for gas water heater | |
| CN205170927U (en) | Steel boiling water constant temperature quenching treatment device | |
| CN206173385U (en) | Heat treatment of materials system | |
| CN110735021A (en) | quenching process method for high-pressure welding gas cylinder material | |
| CN111101092A (en) | Novel efficient and stable hot aluminizing processing method | |
| CN103320782A (en) | Preparation method of magnesium alloy composite film | |
| CN109777924A (en) | A kind of weathering steel high-strength bolt auxiliary connection heat treatment process | |
| CN114525563B (en) | alpha-Al with compact surface for preparing pipe/plate 2 O 3 Method of coating | |
| CN213327786U (en) | Van-type nitriding furnace | |
| CN101761722B (en) | Preparation method of tritium-permeation resistant seamless U-shaped pipeline for thermonuclear fusion experimental reactor | |
| CN101503788A (en) | Ihrigizing technique for tube furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |