CN1089717A - Heat-exchanger tube of high pressure methylamine condenser - Google Patents
Heat-exchanger tube of high pressure methylamine condenser Download PDFInfo
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- CN1089717A CN1089717A CN93115354A CN93115354A CN1089717A CN 1089717 A CN1089717 A CN 1089717A CN 93115354 A CN93115354 A CN 93115354A CN 93115354 A CN93115354 A CN 93115354A CN 1089717 A CN1089717 A CN 1089717A
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- exchanger tube
- heat
- stainless steel
- high pressure
- heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
- F28F21/083—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys from stainless steel
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a kind of heat-exchanger tube of high pressure methylamine condenser, it is characterized in that making by the ferritic-austenitic two phase stainless steel.The present invention is installed in the hp ammonium carbamate condenser, to replace the heat exchanger tube that pure austenitic stainless steel 316L makes.
Description
The invention provides a kind of heat-exchanger tube of high pressure methylamine condenser.
CO had invented in Dutch Stamicarbon company in 1958
1The vaporizing extract process urea production process, existing in the world 67% urea adopts this production technology production, and the key equipment-heat-exchanger tube of high pressure methylamine condenser in this production technology is (up-to-date urea still stipulates to use 316L in October, 1985 with material standard Stamicarbon 18005L version) of selecting that pure austenitic stainless steel 316L makes for use always.Pure austenitic stainless steel is as heat-exchanger tube of high pressure methylamine condenser, has corrosion resistance preferably for the first ammonium medium of tube side.Yet pure austenitic stainless steel 316L but has the stainless self shortcoming of this class, and yield limit is low, and chloride high-temperature water is had stronger Sensitivity of Stress Corrosion.The hp ammonium carbamate condenser shell-side is 150 ℃ and contains CL
-High-temperature water, stressed 79～80%(Luzhou natural gas chemical plant, the University Of Chongqing's research report that reaches pure austenitic stainless steel 316L yield limit of heat exchanger tube will be published in " chemical machinery " 93 years N.1), it is the sensitive part of stress corrosion pilosity, this class defective (" big nitrogenous fertilizer " and the four～six urea annual meeting all have report) all takes place in domestic and international a lot of equipment, become the principal element that limits service life of equipment, domestic four hp ammonium carbamate condensers scrapping all are because due to the heat exchanger tube stress corrosion.Moreover, cause whole device stop work and production midway because the stress corrosion of pure austenitic stainless steel 316L heat exchanger tube usually causes equipment in use to leak, and destroyed the characteristics of urea plant long-term operation, cause several hundred million first economic losses to country.
Therefore pressing for a kind of new material replaces pure austenitic stainless steel 316L, and requires the anti-urea corrosive power of this material to be not less than pure austenitic stainless steel 316L, and stress corrosion has stronger resistivity to high-temperature water.
The object of the present invention is to provide a kind of heat-exchanger tube of high pressure methylamine condenser that adopts the ferritic-austenitic two phase stainless steel to make.
The invention provides a kind of heat-exchanger tube of high pressure methylamine condenser, adopt the ferritic-austenitic two phase stainless steel to make.
Above-mentioned ferritic-austenitic two phase stainless steel is the OOCr22Ni6Mo3 two phase stainless steel, also can be OOCr27Ni7Mo3 or OOCr25Ni5Mo3 two phase stainless steel.
C≤0.03% in the above-mentioned OOCr22Ni6Mo3 two phase stainless steel, Cr=21.5～23%, Ni=5～6.5%, Mo=2.5～3.5%, S≤0.003, P≤0.003.
Described OOCr22Ni6Mo3 two phase stainless steel will be through 1020～1050 ℃ of solution treatment.
Adopt OOCr22Ni6Mo3 to make heat-exchanger tube of high pressure methylamine condenser and have following advantage:
(thermal coefficient of expansion of 316L is 17 * 10 1.OOCr22Ni6Mo3 two phase stainless steel has the thermal coefficient of expansion lower than pure austenitic stainless steel 316L
-6L/ ℃, the thermal coefficient of expansion of OOCr22Ni6Mo3 is 13.5 * 10
-6L/ ℃), the thermal expansion elongation of the heat exchanger tube heat exchanger tube made less than 316L in use, so high pressure methylamine condenser expansion joint structure and installation form are not changed, reduction heat exchanger tube internal-external temperature difference stress 24%, and can reduce tubulation upper and lower temperature difference stress.
The heat exchanger tube that adopts OOCr22Ni6Mo3 to make, its pipe appearance stress corrosion multiple district total stress (static stress and dynamic stress) is 141.50～143.81MPa than the low 12.6%(316L heat exchanger tube maximum total stress of heat exchanger tube that 316L makes, and the maximum total stress of OOCr22Ni6Mo3 heat exchanger tube is 123.66～125.98MPa).
2.OOCr22Ni6Mo3 yield limit can reach 330MPa in serviceability temperature, exceed 83%, the stressed ratio δ with self yield limit of material than 316L
Total stress/ δ 0.2, and 316L's is 0.786～0.799, and OOCr22Ni6Mo3 is 0.375～0.382, and the heat exchanger tube that OOCr22Ni6Mo3 makes has very big elastic range to production operation, can avoid pressure oscillation in the equipment use, and the tubulation that causes damages.
3. containing CL
-High-temperature water in, no matter the stress corrosion resistant ability of OOCr22Ni6Mo3 heat exchanger tube is to adapt to CL
-Concentration, temperature all be better than the 316L heat exchanger tube greatly.
4. in hp ammonium carbamate condenser, can exceed more than 10 times by force rate 316L heat exchanger tube, thereby solved the stress corrosion problem of 316L with its stress corrosion resistant of OOCr22Ni6Mo3 heat exchanger tube.
5.OOCr22Ni6Mo3 the ability of different heat treatment state antagonism urea corrosion all significantly surmounts 316L.
6.OOCr22Ni6Mo3 postwelding has higher impact property and higher austenite content, this is better than other two phase stainless steel for guaranteeing weld zone intensity and corrosion resistance.
7.OOCr22Ni6Mo3 the sensitiveness to two embrittlement points is less, does not increase the device fabrication difficulty.
8.OOCr22Ni6Mo3 thermal conductivity factor (α=15.83kcal/mh ℃) than 316L(α=14.66kcal ℃) height, the equipment heat-transfer capability improves 1.6%, does not reduce capacity of equipment.
Fig. 1 structural representation of the present invention.
Accompanying drawing 1 has been described embodiments of the invention.Heat-exchanger tube of high pressure methylamine condenser of the present invention (1) is made by the ferritic-austenitic two phase stainless steel.Described ferritic-austenitic two phase stainless steel is the OOCr22Ni6Mo3 two phase stainless steel, the C=0.03% among the OOCr22Ni6Mo3, and Cr=21.5%, Ni=5%, Mo=2.5%, S=0.003, P=0.003, and through 1020 ℃ solution treatment.Heat exchanger tube (1) is that an external diameter is the hollow Cylinder of Φ 25mm, and its wall thickness is 2～2.5mm, and the wall thickness of present embodiment is 2.5mm, long 12m.Heat exchanger tube during use (1) is distributed on the interior tube sheet (2) of hp ammonium carbamate condenser triangular in shapely, it is welded to connect with upper and lower tube sheet (2) respectively at two ends up and down, adopt the low C of high CrNiMo to make wlding, OOCr25Ni22Mn4Mo2N for example, wldings such as OOCr27Ni31Mo4N.The molten dark 0.8～1.5mm of heat exchanger tube (1) can continuous welding during device fabrication 4 hours, can not cause that the corrosion resistance of material reduces.
Subordinate list 1 has provided OOCr22Ni6Mo3 and 316L at 20～200 ℃ thermal coefficient of expansion.
Subordinate list 2 has provided OOCr22Ni6Mo3 and 316L at 170 ℃ thermal conductivity factor.
Subordinate list 3 has provided the heat-transfer capability of OOCr22Ni6Mo3 and 316L.
Subordinate list 4 has provided OOCr22Ni6Mo3 and the elastic modelling quantity of 316L in the time of 170 ℃.
Subordinate list 5 has provided the stressing conditions of OOCr22Ni6Mo3 and 316L.
Subordinate list 6 has provided OOCr22Ni6Mo3 and 316L when making heat exchanger tube respectively, and 0.4 meter of pipe end outer wall static stress is calculated on the distance.
20～200 ℃ of thermal coefficient of expansions of two kinds of materials of table 1
| Dimension | OOCr22Ni6Mo3 | 316L |
| 1／℃ | 13.5×10-6 | 17.0×10-6 |
The thermal conductivity factor of two kinds of materials of table 2 (170 ℃)
| Dimension | OOCr22Ni6Mo3 | 316L |
| Kcal/mh℃ | 15.83 | 14.66 |
The heat-transfer capability of two kinds of materials of table 3
| OOCr22Ni6Mo3 | 316L | |
| Coefficient K cal/mh ℃ | 1322 | 1300 |
| Compare heat-transfer capability with 316L | +1.6% | ／ |
Its "+" is for improving heat-transfer capability
The elastic modelling quantity of two kinds of materials of table 4 (170 ℃)
| Dimension | OOCr22Ni6Mo3 | 316L |
| MPa | 183×10 | 191.5×10 |
The stressing conditions of two kinds of materials of table 5
| Dimension | OOCr22Ni6Mo3 | 316L |
| δ bMPa (200 ℃ time) | 580 | 465 |
| δ 0.2MPa (200 ℃ time) | 330 | 180 |
| The total MPa of δ θ | 120.95～123.25 | 138.08～140.38 |
| The total MPa of δ Z | 25.77～26.07 | 30.93～31.23 |
| The total MPa of δ | 123.66～125.98 | 141.50～143.81 |
| δ is total/δ 0.2 | 0.375～0.382 | 0.786～0.799 |
When two kinds of materials of table 6 were made heat exchanger tube respectively, 0.4 meter of pipe end outer wall static stress was calculated on the distance
| MPa | OOCr22Ni6Mo3 | 316L | ||||
| δr | δθ | δz | δr | δθ | δz | |
| Internal-external temperature difference stress | 0 | 53.916 | 16.175 | 0 | 71.048 | 21.314 |
| Inside and outside differential pressure stress | -0.45 | 47.728 | 0 | -0.45 | 47.728 | 0 |
| Upper and lower temperature difference stress | 0 | 0.003 | 0.012 | 0 | 0.004 | 0.016 |
| Weight stress | 0 | 0 | 1.773 | 0 | 0 | 1.789 |
| Constraint reaction | 0 | 0 | -1.59 | 0 | 0 | -1.59 |
| Total stress | -0.45 | 101.647 | 16.37 | -0.45 | 118.78 | 21.529 |
Claims (4)
1, a kind of heat-exchanger tube of high pressure methylamine condenser is characterized in that by ferrite--the austenite two phase stainless steel is made.
2, heat-exchanger tube of high pressure methylamine condenser according to claim 1 is characterized in that described ferritic-austenitic two phase stainless steel is the OOCr22Ni6Mo3 two phase stainless steel.
3, heat-exchanger tube of high pressure methylamine condenser according to claim 1 and 2 is characterized in that C≤0.03% in the described OOCr22Ni6Mo3 two phase stainless steel, Cr=21.5～23%, Ni=5～6.5%, Mo=2.5～3.5%, S≤0.003, P≤0.003.
4, heat-exchanger tube of high pressure methylamine condenser according to claim 1 and 2 is characterized in that described OOCr22Ni6Mo3 two phase stainless steel is through 1020～1050 ℃ solution treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93115354A CN1089717A (en) | 1993-01-08 | 1993-10-29 | Heat-exchanger tube of high pressure methylamine condenser |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93110812 | 1993-01-08 | ||
| CN93110812.8 | 1993-01-08 | ||
| CN93115354A CN1089717A (en) | 1993-01-08 | 1993-10-29 | Heat-exchanger tube of high pressure methylamine condenser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1089717A true CN1089717A (en) | 1994-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93115354A Pending CN1089717A (en) | 1993-01-08 | 1993-10-29 | Heat-exchanger tube of high pressure methylamine condenser |
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| CN (1) | CN1089717A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113476880A (en) * | 2017-10-27 | 2021-10-08 | 斯塔米卡邦有限公司 | High pressure carbamate condenser |
-
1993
- 1993-10-29 CN CN93115354A patent/CN1089717A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113476880A (en) * | 2017-10-27 | 2021-10-08 | 斯塔米卡邦有限公司 | High pressure carbamate condenser |
| US11766627B2 (en) | 2017-10-27 | 2023-09-26 | Stamicarbon B.V. | High pressure carbamate condenser |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |