CN102004116A - Method for decomposing thermal expansion stress generated by adhering polytetrafluoroethylene (PTFE) sheet to steel tank inner wall under condition of high temperature - Google Patents
Method for decomposing thermal expansion stress generated by adhering polytetrafluoroethylene (PTFE) sheet to steel tank inner wall under condition of high temperature Download PDFInfo
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- CN102004116A CN102004116A CN 201010287017 CN201010287017A CN102004116A CN 102004116 A CN102004116 A CN 102004116A CN 201010287017 CN201010287017 CN 201010287017 CN 201010287017 A CN201010287017 A CN 201010287017A CN 102004116 A CN102004116 A CN 102004116A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229920001343 polytetrafluoroethylene Polymers 0.000 title abstract 9
- 239000004810 polytetrafluoroethylene Substances 0.000 title abstract 9
- -1 polytetrafluoroethylene Polymers 0.000 title abstract 2
- 238000003466 welding Methods 0.000 claims abstract description 10
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 9
- 230000035882 stress Effects 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000008646 thermal stress Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000011109 contamination Methods 0.000 abstract 1
- 238000009826 distribution Methods 0.000 abstract 1
- 238000005553 drilling Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000005498 polishing Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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Abstract
The invention provides a method for decomposing thermal expansion stress generated by adhering polytetrafluoroethylene (PTFE) sheet to a steel tank inner wall under the condition of high temperature, comprising the following steps: drilling 9-12 through holes with phi being 4mm on the steel tank inner wall in a even distribution mode and polishing the through holes with a abrasion wheel, and removing oil contamination by washing; manufacturing a ring with diameter being 100-200mm by a round bar steel with phi being 4-6mm, and welding four dots at a joint by spot welding; welding steel rings arranged in a regular triangle mode on the upper and lower parts of the steel tank inner wall as well as the steel tank bottom by spot welding, and ensuring gap between the two adjacent rings to be less than or equal to the diameter of the ring; and adhering the PTFE sheet to the steel tank inner wall and covering the rings by the PTFE sheet to be adhered to the rings due to isobaric delivery of steel balls under the condition of high temperature, thus forming a stress decomposition zone with small area. In the method of the invention, separation, bulge and tearing of the adhered PTFE sheet can be avoided; the problem that the thermal expansion stress of the PTFE sheet under the condition of high temperature can be solved; and lined PTFE sheet products with high negative pressure resistance can be produced indeed. The method of the invention can be widely applied to the technical field of chemical anticorrosion.
Description
Technical field: the decomposition method that the present invention relates to cylinder of steel inwall high temperature adhesives tetrafluoro plate thermal expansion stress.Be applicable to the chemical anticorrosion technical field.
Background technology: the tetrafluoro plate of the at high temperature bonding 2-3mm thickness of cylinder of steel inwall, ubiquity an insurmountable difficult problem: the thermal expansivity of tetrafluoro plate and cylinder of steel differs greatly, the thermal expansion stress that the tetrafluoro plate is at high temperature produced is than about big ten times of cylinder of steels, bonding tetrafluoro plate is under high temperature high negative pressure operating mode, because the thermal expansion stress great disparity, under the shearing action that the thermal expansion of tetrafluoro plate produces, tetrafluoro plate bonding coat will come off, bubbling is torn.In order to address this problem, we have a look the example in the life: carry water and go up a hill when you choose one, road is rugged and rough, carry water and walk, the water in the bucket will rock terribly, and water can shake out, if water surface is put two wood chopsticks in bucket, the hill path of going further, water surface just can not rock very serious.This is the tension force that has decomposed water surface because of two wooden chopsticks, makes large-area surface tension be decomposed into the surface tension of small size.Polar expansion also can utilize this principle to decompose large-area polar expansion stress.
Summary of the invention: purpose of the present invention is exactly the decomposition method that a kind of cylinder of steel inwall high temperature adhesives tetrafluoro plate thermal expansion stress will be provided, and it can solve the existing thermal expansion stress great disparity of the at high temperature bonding tetrafluoro plate of cylinder of steel inwall problem.The object of the present invention is achieved like this, and the decomposition method of cylinder of steel inwall high temperature adhesives tetrafluoro plate thermal expansion stress is characterized in that: along the position, upper, middle and lower, bore 9-12 at the cylinder of steel inwall
Through hole, coarse with grinder buffing, clean greasy dirt; With φ 4mm～φ 6mm round steel, make diameter 100mm～200mm annulus, joint spot welding 4 points; The uniform point of steel annulus that equilateral triangle is arranged is welded in the upper and lower and cylinder of steel bottom of cylinder of steel inwall, spacing≤circle diameter between adjacent two annulus; At high temperature because the equipressure transmission of steel ball, tetrafluoro plate and cylinder of steel inwall are bonding, and while tetrafluoro plate has also covered annulus and bonding with annulus, have formed the stress resolver of small size.
Calculation specifications:
1. establish cylinder of steel diameter 500mm, the linear perimeter length L of steel is that 500X3.14=1570 (mm) cylinder of steel is heated in baking oven, is elevated to 360 ℃, the calculating of cylinder of steel girth elongation from 20 ℃:
The thermal expansion of steel is μ=13.9X10
-6
Be elevated to 360 ℃ from 20 ℃, temperature difference T is that 340 the linear expansion coefficients of steel when spending are:
ΔTμ＝340X13.9X10
-6＝0.004726
The elongation of cylinder of steel girth is: L (Δ T) μ=1570X0.004726=7.4 (mm)
2. the liner tetrafluoro printed line perimeter length L that is located among the cylinder of steel diameter 500mm is
500X3.14+(40X2)＝1650(mm)
(40X2) be meant tetrafluoro plate scrap (bridge) length
The thermal expansion of tetrafluoro plate is μ=12X10
-5
Be elevated to 360 ℃ from 20 ℃, temperature difference T is that the linear expansion coefficients of 340 degree tetrafluoro plates are:
ΔTμ＝340X12X10
-5＝0.0408
The elongation of tetrafluoro plate girth is: L (Δ T) μ=1650X0.0408=67.32 (mm)
In like manner, by the aforementioned calculation method, cylinder of steel in normal operation: be elevated to 200 ℃, cylinder of steel girth elongation 4.1mm, tetrafluoro plate elongation 37.40mm from 20 ℃.
Tetrafluoro plate and cylinder of steel while, at high temperature linear elongation differed 9 times.
3. in order to solve under 200 ℃ of states of cylinder of steel normal working temperature, the linear thermal expansion factor of tetrafluoro plate liner is reduced to minimum value, utilize the extensibility more than 200% and the cylinder of steel of tetrafluoro plate to expand synchronously.
The present invention is resolved into small size to large-area tetrafluoro plate differential expansion stress and is expanded at cylinder of steel inwall spot welding annulus.The tetrafluoro plate in normal operation can be because of the excessive thermal expansion factor of tetrafluoro plate like this, not make bonding tetrafluoro plate shelling, bulge and tearing.Solved the tetrafluoro plate under the condition of high temperature, the thermal expansion stress problem.Can produce the liner tetrafluoro panel products of real negative pressure resistant, be widely used in the chemical anticorrosion technical field.
Description of drawings:
Fig. 1 is the steel circular ring structure synoptic diagram that equilateral triangle is arranged among the present invention;
Fig. 2 is the cross-sectional structure synoptic diagram that the tetrafluoro plate covers annulus among the present invention;
1. tetrafluoro plate, 2. annulus, 3. cylinder of steel inwall, 4. stress resolver.
Embodiment: the invention will be further described below in conjunction with accompanying drawing;
The decomposition method of the bonding tetrafluoro plate of cylinder of steel inwall high temperature pressure thermal expansion stress is characterized in that: along the position, upper, middle and lower, bore 9-12 at cylinder of steel inwall 3
Through hole, coarse with grinder buffing, clean greasy dirt; With φ 4mm～φ 6mm round steel, make diameter 100mm～200mm annulus 2, joint spot welding 4 points; The steel annulus 2 uniform points that equilateral triangle is arranged are welded in cylinder of steel inwall 3 upper and lower and cylinder of steel bottoms, spacing≤annulus 2 diameters between adjacent two annulus 2; At high temperature because the equipressure transmission of steel ball, tetrafluoro plate 1 is bonding with cylinder of steel inwall 3, and tetrafluoro plate 1 has also covered annulus 2 and bonding with annulus 2 simultaneously, has formed the thermal stress resolver of small size.During concrete enforcement, described tetrafluoro plate is meant polyfluortetraethylene plate.On cylinder of steel inwall edge, in, upper/lower positions, 12 on uniform brill
Through hole, coarse with grinder buffing, clean greasy dirt, guaranteed when cylinder of steel heats, the air between in tetrafluoro plate and the cylinder of steel is discharged gradually, guaranteed bonding quality; With φ 5mm round steel, make diameter 100mm annulus, joint spot welding 4 points; The uniform point of steel annulus that equilateral triangle is arranged is welded in the upper and lower and cylinder of steel bottom of cylinder of steel inwall, and spacing is 100mm between adjacent two annulus.At high temperature, the tetrafluoro lining covers steel annulus and bonding with the tetrafluoro lining, has formed the small size breathing space, has solved the bonding thermal expansion stress great disparity problem of different materials.
Claims (3)
1. the decomposition method of the bonding tetrafluoro plate of cylinder of steel inwall high temperature pressure thermal expansion stress is characterized in that: at cylinder of steel inwall spot welding annulus, and the thermal stress resolver that large-area tetrafluoro plate differential expansion stress is resolved into small size.
2. the decomposition method of the bonding tetrafluoro plate of cylinder of steel inwall high temperature pressure according to claim 1 thermal expansion stress is characterized in that: along the position, upper, middle and lower, bore 9-12 at cylinder of steel inwall (3)
Through hole, coarse with grinder buffing, clean greasy dirt.
3. the decomposition method of the bonding tetrafluoro plate of cylinder of steel inwall high temperature pressure according to claim 1 thermal expansion stress is characterized in that: with φ 4mm～φ 6mm round steel, make diameter 100mm～200mm annulus (2), joint spot welding 4 points; The uniform point of steel annulus (2) that equilateral triangle is arranged is welded in the upper and lower and cylinder of steel bottom of cylinder of steel inwall (3), spacing≤annulus (2) diameter between adjacent two annulus (2); At high temperature because the equipressure transmission of steel ball, tetrafluoro plate (1) is bonding with cylinder of steel inwall (3), and tetrafluoro plate (1) has also covered annulus (2) and bonding with annulus (2) simultaneously, has formed the thermal stress resolver of small size.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010287017 CN102004116A (en) | 2010-09-14 | 2010-09-14 | Method for decomposing thermal expansion stress generated by adhering polytetrafluoroethylene (PTFE) sheet to steel tank inner wall under condition of high temperature |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010287017 CN102004116A (en) | 2010-09-14 | 2010-09-14 | Method for decomposing thermal expansion stress generated by adhering polytetrafluoroethylene (PTFE) sheet to steel tank inner wall under condition of high temperature |
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| Publication Number | Publication Date |
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| CN102004116A true CN102004116A (en) | 2011-04-06 |
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|---|---|---|---|
| CN 201010287017 Pending CN102004116A (en) | 2010-09-14 | 2010-09-14 | Method for decomposing thermal expansion stress generated by adhering polytetrafluoroethylene (PTFE) sheet to steel tank inner wall under condition of high temperature |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3393262A (en) * | 1965-07-07 | 1968-07-16 | Buckeye Cellulose Corp | Removal of gels and small particles from viscose |
| CN1062674A (en) * | 1990-12-18 | 1992-07-15 | 赵永镐 | Negative pressure-resisting corrosion-resisting lining |
| CN1065423A (en) * | 1992-02-18 | 1992-10-21 | 赵永镐 | Negative pressure resistant, the bonding anticorrosive products of high temperature tetrafluoro compound close line and method for making |
| CN2465797Y (en) * | 2001-01-20 | 2001-12-19 | 胡永庆 | Negative pressure resistant steel lined PTFE reaction tank |
| US20040173978A1 (en) * | 2003-03-06 | 2004-09-09 | Christopher Bowen | PTFE membranes and gaskets made therefrom |
| CN201179445Y (en) * | 2008-03-25 | 2009-01-14 | 胡永庆 | Tetra-fluorine liner reaction tank with small area expansion stress |
-
2010
- 2010-09-14 CN CN 201010287017 patent/CN102004116A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3393262A (en) * | 1965-07-07 | 1968-07-16 | Buckeye Cellulose Corp | Removal of gels and small particles from viscose |
| CN1062674A (en) * | 1990-12-18 | 1992-07-15 | 赵永镐 | Negative pressure-resisting corrosion-resisting lining |
| CN1065423A (en) * | 1992-02-18 | 1992-10-21 | 赵永镐 | Negative pressure resistant, the bonding anticorrosive products of high temperature tetrafluoro compound close line and method for making |
| CN2465797Y (en) * | 2001-01-20 | 2001-12-19 | 胡永庆 | Negative pressure resistant steel lined PTFE reaction tank |
| US20040173978A1 (en) * | 2003-03-06 | 2004-09-09 | Christopher Bowen | PTFE membranes and gaskets made therefrom |
| CN201179445Y (en) * | 2008-03-25 | 2009-01-14 | 胡永庆 | Tetra-fluorine liner reaction tank with small area expansion stress |
Non-Patent Citations (2)
| Title |
|---|
| 《沈阳化工》 19921231 陈国龙 国家科委推荐采用带金属网的聚四氟乙烯衬里系列防腐产品 62 1-3 , * |
| 《石油化工设备技术》 19971231 方琼 钢塑复合管成型和应用中常见的问题 第52-55页 1-3 第18卷, 第4期 * |
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Application publication date: 20110406 |