CN1191300A - Corrosion-resistant heat exchanger capable of resisting to high-temp. sulfur,hydrogen sulfide and sulfuric acid dew point corrosion - Google Patents
Corrosion-resistant heat exchanger capable of resisting to high-temp. sulfur,hydrogen sulfide and sulfuric acid dew point corrosion Download PDFInfo
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- CN1191300A CN1191300A CN97109238A CN97109238A CN1191300A CN 1191300 A CN1191300 A CN 1191300A CN 97109238 A CN97109238 A CN 97109238A CN 97109238 A CN97109238 A CN 97109238A CN 1191300 A CN1191300 A CN 1191300A
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Abstract
An anticrossion heat exchanger of shell-and-tube type for heat exchange between two or more kinds of fluid features that the low-alloy steel material with excellent anticrossion performane, such as 12 AlMoV for resisting high-temp sulfur corrosion, 12Cr2AlMoV for resisting hydrogen sulfide (H2S-HCN-H2O) stress corrosion and 10 CrMnCu(Ti,Sb) for resisting sulfuric acid dew point corrosion, is used to make its main body, so having higher anticorrosion effect.
Description
The present invention relates to the position that two kinds and two or more medium carry out heat exchange.
Heat exchanger is a kind of equipment that two or more fluid media (medium) carries out heat exchange that is used for, in order to solve the stronger phenomenon of feature medium heat exchanging device corrosion, progressively use super-low carbon stainless steel instead or reduce the extent of corrosion of medium in some oil refining and the chemical plant installations equipment with methods such as spraying, aluminisings, though play certain anti-rotten effect, but still have the following disadvantages:
One, solve erosion-resisting major measure of heat exchanger and existing problems at present:
With super-low carbon stainless steel (as 304L, 316L) though produce that heat exchanger has solved the anti-corrosion effects in the special media but its prices of raw and semifnished materials are too high, cost of investment is too big, is not anticorrosive heat exchanger first-selection material.
2. with chemical special coating tube bank is sprayed, but very easily clashing and breaking in installation process, and under hot conditions, also easily come off, do not have real anti-corrosion effects.
3. though the whole aluminising of heat exchanging organ pipe Shu Jinhang also can be played anti-preferably rotten effect, general aluminising producer does not have the ability of manufacturing equipment, equipment and aluminising separate machined, and its processing system is also inconvenient, and the aluminising expense is higher, and the real scope of promoting is little.
The invention solves the deficiency of several problems, select for use the new steel of high-quality low-alloy to make heat exchanger, both solved the anti-rotten problem of special media, reduced the cost of investment of equipment again, also solved the difficult problem of processing and manufacturing inconvenience simultaneously.
The object of the present invention is to provide several good heat exchangers made from new material of corrosion resistance, the seriously corroded that solves because of equipment causes device stopping production or maintenance frequently.
Now the present invention is specifically summarized:
1.12AlMoV low-alloy steel: be to contain the low-alloy steel product that the sulfur corrosion of aluminium high temperature resistance is used according to the functional and no network that the needs of China's sour crude oil refining are succeeded in developing, the large-scale popularization application in petrochemical industry of its sheet material, be mainly used in tower and tower inner member, the present invention manufactures heat exchanger with the tubing of 12AlMoV and tube sheet etc. first.(1) chemical analysis of 12AlMoV steel: (%)
(2) high temperature resistant sulfur corrosion performance (comparing) with Q235:
| ????C | ????Mn | ????Si | ????Mo | ????Al | ????V | ??S、P |
| ≤0.12 | ?0.30/0.60 | ?0.50/0.80 | ?0.30/0.40 | ?0.70/1.10 | ?0.03/0.10 | ≤0.04 |
| Dielectric corrosion rate material | 360 ℃ of sulfur-bearing 1.23% heavy oil | 380 ℃ of sulfur-bearing 1.04% heavy oil | 380 ℃ of sulfur-bearing 0.632% slurry oils | 410 ℃ of heavy-cycle oil |
| ????12AlMoV | 0.45mm/ year | 0.016mm/ year | 0.038mm/ year | 0.048mm/ year |
| ????Q235-A | 1.70mm/ year | 0.113mm/ year | 0.63mm/ year | 0.728mm/ year |
Utilize the comprehensively anti-rotten effect of aluminium, silicon, replace chromium fully, make the high temperature resistance sulfur corrosion of 12AlMoV steel mother metal and weld seam can the high 4-16 of force rate Q235-A times.(3) adopt knot 507 molybdenum welding rods and H-10MnSi welding wire to join 431 solder flux, successfully solved the solder technology of high aluminum steel.
2. 12Cr2AlMoV low-alloy steel: belong to a kind of anti-H 2 S (H2S-HCN-H2O) stress corrosion steel, anti-H 2 S stress corrosion cracking in petrochemical equipment, anti-homogeneous corrosion and hydrogen blister ability are all stronger, its sheet material has been widely used in tower, container and the tower inner member of petrochemical industry, and the present invention uses the tubing of 12Cr2AlMoV and tube sheet as heat exchanger main body new material first.
(1) chemical composition of 12Cr2AlMoV: (%)
(2) corrosion resistant performance of steel is relatively: (by last steel three factory's steel grind test)
| ????C | ????Mn | ????Si | ????Cr | ????Al | ????Mo | ????V | ????S、P |
| ?0.08/0.14 | ?0.30/0.60 | ?0.20/0.50 | ?2.00/2.50 | ?0.30/0.70 | ?0.30/0.40 | ?0.05/0.15 | ??≤0.035 |
| ??H2S-H2O | Homogeneous corrosion | Hydrogen embrittlement coefficient (72 hours) | Hydrogen blister |
| In the saturation system | Q235-A, 12Cr2AlMoV 0.4mm/ 0.064mm/ | 25g, 12Cr2AlMoV 65.2mm/ 23.4mm/ | 25g, 12Cr2AlMoV are much few |
| The high-temperature sulfur corrosion medium | Q235-A 2.8-4.5mm/ | 12Cr2AlMoV 0.099-0.38mm/ | |
| The rare organic acid corrosive medium | Q235-A 1.19mm/ | 12Cr2AlMoV 0.2mm/ |
The erosion resistance of 12Cr2AlMoV in the H2L-H2O saturation system is higher more than 6 times than carbon steel as seen from the above, and the erosion resistance in high temperature sulphur medium improves 10-25 doubly than carbon steel, and the erosion resistance in the rare organic acid medium improves 5-6 doubly than carbon steel.
(3) adopt hot 317 welding rods and Ho8CrMoVA welding wire to join 350 molten refining type solder flux, weld preceding 200-250 ℃ of preheating, successfully solved the solder technology of 12Cr2AlMoV low-alloy steel.
3. 10CrMnCu (Ti, Sb) low-alloy steel has another name called the NK steel: be the special steel grade of a kind of corrosion of sulfuric acid at dew point, its sheet material is mainly used in makes heating furnace, chimney, flue, desulfurizer etc.The present invention appoints the heat exchanger of making resistant to sulfuric acid dew point corrosion with the steel pipe of 10CrMnCu and tube sheet first.
(1) chemical analysis:
(2) 10CrMnCu and SM41A corrosion resistant performance are relatively:
| ??C | ????Mn | ????Si | ????Cr | ????Cu | ????P | ????S | Ti, Sb, B (addition) |
| ≤0.10 | ?0.35/0.70 | ?0.20/0.50 | ?0.80/1.50 | ?0.30/0.45 | ≤0.03 | ≤0.03 | ????≤0.15 |
| Corrosion steel grade medium velocity condition | ??10CrMnCu | ????SM41A | Test unit |
| ??30℃、20％H2SO4 | 0.16mm/ year | 0.62mm/ year | Shanghai material institute |
| ??40℃、40％H2SO4 | 2.79mm/ year | 5.99mm/ year | Shanghai material institute |
| ??50℃、40％H2SO4 | 10.63mm/ year | 47.25mm/ year | Shanghai material institute |
| ??70℃、50％H2SO4 | 21.77mm/ year | 105.3mm/ year | Shanghai material institute |
Annotate: SM41A is the chimney steel of Japanese import specialty resistant to sulfuric acid dew point corrosion.
As seen from the above table, 10CrMnCu and SM41A steel its corrosion resistance in various corrosive mediums of different nature all is better than the latter, and particularly the 10CrMnCu resistant to sulfuric acid dew point corrosion is about 5 times of the latter in 70 ℃ of harsher corrosive mediums, 50%H2SO4 solution.
(3) the automatic weldering of employing SSH, J427CrCu stick electrode and Ho8CrCuS and HJ350, its welding procedure shows that the solderability of this steel is good, and cracking resistance is good, and the resistant to sulfuric acid dew point corrosion ability and the matrix of welding point are on close level.
Below in conjunction with accompanying drawing structure of the present invention is done further general introduction:
Figure (1) is an outside drawing in kind of the present invention.
Figure (2) is object construction figure of the present invention.
Shown in figure (2), patent of the present invention is made up of bobbin carriage 1, housing 3,4 three main parts of tube bank, the heat exchanger tube diameter of tube bank 4 is φ 19～φ 57m/m, the thickness of stream plate 5 is δ=3-10m/m, the spacing of deflection plate according to actual conditions and the thickness of fixed tube plate 22 to adapt to scope be δ=30-100m/m.
The present invention compared with prior art, it is simple to have a processing and manufacturing, anti-corrosion property is good under the particular fluid dielectric corrosion is widely used in various types of heat exchangers.
Claims (4)
1. the heat exchanger of a shell-and-tube is made up of several parts such as bobbin carriage 1, housing 3, tube banks 4, it is characterized in that having selected the corrosion-resistant material of the superior new steel grade of corrosion resistance as heat exchanger for use under the bigger situation of special flow body medium heat exchanging modulator material corrosion.
2. state institute's shell-and-tube heat exchanger as claims 1, it is characterized in that selecting for use 12AlMoV low-alloy steel tube sheet 2, steel pipe 6 and the deflection plate 5 of high temperature resistance sulphur.
3. as claims 1 described shell-and-tube heat exchanger, it is characterized in that selecting for use 12Cr2AlMoV low-alloy tube sheet 2, steel pipe 6 and the deflection plate 5 of anti-H 2 S (H2S-HCN-H2O) stress corrosion.
4. as claims 1 described shell-and-tube heat exchanger, it is characterized in that selecting for use 10CrMnCu (Ti, Sb) low-alloy tube sheet 2, steel pipe 6 and the deflection plate 5 of sulfuric-resisting dew point corrosion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97109238A CN1191300A (en) | 1997-09-11 | 1997-09-11 | Corrosion-resistant heat exchanger capable of resisting to high-temp. sulfur,hydrogen sulfide and sulfuric acid dew point corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97109238A CN1191300A (en) | 1997-09-11 | 1997-09-11 | Corrosion-resistant heat exchanger capable of resisting to high-temp. sulfur,hydrogen sulfide and sulfuric acid dew point corrosion |
Related Child Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99116661 Division CN1074829C (en) | 1999-09-16 | 1999-09-16 | Heat exchanger capable of resisting wet hydrogen sulfide corrosion |
| CN 99116663 Division CN1258839A (en) | 1999-09-16 | 1999-09-16 | Heat exchanger capable of resisting high-temperature sulfur corrosion |
| CN 99116662 Division CN1258841A (en) | 1999-09-16 | 1999-09-16 | Heat exchanger capable of resisting the corrosion of sulfuric acid at dew point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1191300A true CN1191300A (en) | 1998-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97109238A Pending CN1191300A (en) | 1997-09-11 | 1997-09-11 | Corrosion-resistant heat exchanger capable of resisting to high-temp. sulfur,hydrogen sulfide and sulfuric acid dew point corrosion |
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| Country | Link |
|---|---|
| CN (1) | CN1191300A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109652745A (en) * | 2019-03-01 | 2019-04-19 | 江苏建中新材料科技有限公司 | A kind of acidproof heat exchanger tube steel and its processing technology |
| CN113617041A (en) * | 2021-07-21 | 2021-11-09 | 简庄春 | Reboiler for alcohol processing |
-
1997
- 1997-09-11 CN CN97109238A patent/CN1191300A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109652745A (en) * | 2019-03-01 | 2019-04-19 | 江苏建中新材料科技有限公司 | A kind of acidproof heat exchanger tube steel and its processing technology |
| CN113617041A (en) * | 2021-07-21 | 2021-11-09 | 简庄春 | Reboiler for alcohol processing |
| CN113617041B (en) * | 2021-07-21 | 2022-11-29 | 邳州市鑫盛创业投资有限公司 | Reboiler for alcohol processing |
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