CN1327935C - Stainless steel drying tower absorption tower - Google Patents
Stainless steel drying tower absorption tower Download PDFInfo
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- CN1327935C CN1327935C CNB2004100411927A CN200410041192A CN1327935C CN 1327935 C CN1327935 C CN 1327935C CN B2004100411927 A CNB2004100411927 A CN B2004100411927A CN 200410041192 A CN200410041192 A CN 200410041192A CN 1327935 C CN1327935 C CN 1327935C
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- tower
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- acid
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Abstract
The present invention discloses a drying and absorbing tower composed of a defogger, an acid distributing device, a tower body, a filling material, a filling material support and installing pieces. The present invention is mainly characterized in that the tower body, the acid distributing device and the filling material support are all made of XDS stainless steel so that the present invention has the advantages of high high-temperature sulfuric acid corrosion resistance and mechanical property; the tower body forms a vertical cylindrical shape and is made of plates, the bin of the tower body is provided with a reinforcing ring and a reinforcing rib, the tower bottom adopts a papilionaceous bottom, the filling material support is in a metal grating structure, and the acid distributing device does not need to be protected by positive poles. The present invention solves the problem of high-temperature sulfuric acid corrosion, and is an XDS stainless steel drying and absorbing tower with high strength, good rigidity, light weight, complete and reliable operation and long service life.
Description
Technical field: the present invention relates to a kind of drying and absorbing tower, specifically about a kind of stainless steel drying and absorbing tower that is used to produce sulfuric acid.
Background technology: the structure on existing drying tower, absorption tower generally by tower body, packing support plate, fill out acid separating device, compositions such as demister, its tower body is by carbon steel shell liner acid-proof ceramic tile or inner liner stainless steel material, its shortcoming is the equipment heaviness, the equipment construction difficulty is big, is difficult for after the lining seepage detecting and maintenance; Acid separating device is the important component part on sulfuric acid tower, absorption tower; the acid trap of use is because material adopts plain cast iron processing, manufacturing, installation to be difficult to reach requirement in early days; general at present employing 18-8 is that stainless steel applies the anodic protection technology; consider factors such as the dense control of production practical operation such as acid is improper; and the adjustment of anodic protection control parameter will be made troubles to production operation; there is unsafe factor to exist; packing support plate generally adopts ceramic material to do supporting member owing to there is not suitable metal material.
Summary of the invention: the objective of the invention is to solve that acid separating device, packing support plate contacts the difficult problem that corrosion takes place in the tower body of drying and absorbing tower and the tower with high temperature sulfuric acid, provide a kind of intensity height that is applicable to the high-temperature concentrated sulfuric acid medium, good rigidly, in light weight, energy-conservation, make that installation is easy, reliable operation, long service life, easy to operate stainless steel drying tower, absorption tower.
The present invention is that to solve the problems of the technologies described above the technical scheme of being taked as follows: the stainless steel drying and absorbing tower, comprise tower body, packing support plate and acid separating device, it is characterized in that described tower body is a vertical and cylindrical, tower body is outside equipped with stiffening ring and reinforcement, packing support plate adopts the metallic grid structure, acid separating device adopts the trough-pipe type structure, Saucer Bottom is adopted in design at the bottom of the tower, described tower body, acid separating device and packing support plate adopt rare-earth element modified stainless steel manufacturing, its main chemical composition of described rare-earth element modified special stainless steel is (weight): C :≤0.03%, and Si:5-8%, Cr:8-14%, Ni:15-25%, Mo:0.70-1.0%, Cu:0.7-1.0%, rare earth element :≤0.4%, but can not be 0, all the other are Fe.
The present invention's beneficial effect compared with prior art is: described rare-earth element modified stainless chemical analysis design makes it be in stable austenitic area, in steel, add rare earth element, after it is carried out modification, can obviously improve the performance of the following several respects of stainless steel material:
1, rare earth element has changed the composition and the form of the sulphide inculsion that is easy to form spot corrosion in the steel, has reduced the sulfur content in the steel, has improved the pitting resistance of steel.
2, with the steel of rare-earth treatment, can eliminate the poly-partially of sulphur, purify crystal boundary, thereby improve the thermoplasticity of steel.Rare earth and sulphur form sulphide inculsion, and its fusing point generally in 1500-2400 ℃ of scope, becomes crystallization nuclei when steel solidifies, thereby can not form the cellular segregttion of sulphur and worsen the thermoplasticity of steel at crystal boundary, simultaneously the grain structure that had refinement of crystallization nuclei.Rare earth element, enrichment on carbide-basal body interface poly-analysing of crystal boundary also is to benefit the thermoplastic raising of steel.
3, stainless steel of the present invention is because the silicone content height is very easily separated out fragility σ phase and silicide at 600-900 ℃, and in order to address this problem, stainless steel of the present invention adopts the way that adds rare earth element to improve the quality of weld seam when alloying.Add rare earth element in the steel, can reduce fragility in the weld metal mutually and silicate in the formation and the gathering of austenite grain boundary.With high-melting-point and be the rare-earth sulfide that disperse distributes and replace low-melting Ni
3S
4, attenuate the thickness of second phase on the austenite grain boundary, intercrystalline adhesion is improved.After adding rare earth element, stainless weld grain of the present invention is fined, has improved the quality of weld seam.Compare with the DS-1 stainless steel that does not add rare earth element, avoided the tendency of weld seam generation along brilliant crackle.Reduced nickel in addition; the metal content therein that price such as chromium and molybdenum is more expensive; material cost is lower; and decay resistance with excellence; welding performance and processing characteristics; therefore be highly suitable for and can be used to make acid cooler in the sulfuric acid industry; dry absorption tower; critical component in the demister; make tower body with this rare-earth element modified special stainless steel; acid separating device and packing support plate; need not be at tower body liner acid-proof ceramic tile or inner liner stainless steel material; therefore has the intensity height; good rigidly; in light weight; high temperature resistant concentrated sulfuric acid corrosivity is excellent; long service life; reliable operation; easy to operate; easy construction meets the requirement of sulfur process development, and the metallic grid percent opening is big; force structure is reasonable; advantages such as acid separating device does not need anodic protection, and pressure drop is little, and liquid distribution is even.
The invention will be further described below in conjunction with embodiment and accompanying drawing.
Description of drawings:
Accompanying drawing 1 is a structure chart of the present invention.
Specific embodiments: as shown in Figure 1, drying and absorbing tower by demister 1, tower body upper body 2, tower body 3, stiffening ring 4, reinforcement 5, acid separating device 6, filler 7, packing support plate 8, tower at the bottom of 9 and installed part form, demister 1 adopts wire mesh structure, it is the stainless steel materials manufacturing that tower body upper body 2 adopts 18-8, tower body 3 is a vertical and cylindrical, make with sheet material, stiffening ring 4 and reinforcement 5 are set outward, Saucer Bottom is adopted in 9 designs at the bottom of the tower, acid separating device 5 adopts the trough-pipe type structure, and packing support plate 8 adopts the metallic grid structure.Wherein parts such as tower body, acid separating device, packing support plate adopt rare-earth element modified stainless steel material manufacturing at least, its main chemical composition of described rare-earth element modified special stainless steel is by weight: C:0.02%, Si:7%, Cr:12%, Ni:20%, Mo:0.8%, Cu:0.85%, lanthanum and cerium mixture: 0.35%, all the other are Fe.
To aspect mechanical property and the decay resistance stainless steel of the present invention-XDS stainless steel (China a surname reaches) contrasted with stainless steel with several external typical high temperature concentrated sulfuric acids by the mode of chart below:
1, mechanical property:
Adopt the GB0228-2002 standard, on AC-5000A type universal hydraulic testing machine, tested the conventional mechanical property of thickness 3.0mm through the XDS stainless steel hot rolling sheets of solution treatment.
Several high-temperature concentrated sulfuric acids of table 2 compare (solid solution condition) with stainless mechanical property
| Alloy designations | Hot strength σ b/ MPa | Yield strength σ 0.2/ MPa | Percentage elongation % |
| XDS (3.0mm plate, parallel roll to) | 746.39 | 337.00 | 59.00 |
| XDS (3.0mm plate, vertically roll to) | 757.07 | 333.50 | 55.90 |
| DS-1 (3.0mm plate) | 560 | 250 | ＞50 |
| 700Si (＜20mm plate) | 540 | 240 | 50 |
| SX | 490-800 | ＞220 | ＞45 |
| ZeCor (ASTM A240 standard) | ≥538 | ≥255 | ≥30 |
| ZeCor (typical data) | 800 | 379 | 53 |
2, the stainless decay resistance of XDS:
Corrosion test is undertaken by the ASTMG31-72 standard.Specimen size 40mm * 15mm * 3mm uses 150 successively
#, 400
#, 600
#The silicon carbide paper polishing.Experiment container is the 2000ml beaker, and each beaker is put into 3 samples of the same race, and corrosion rate is got the mean value of 3 parallel samples.Adopt water-bath when test temperature is lower than 100 ℃, adopt when being greater than or equal to 100 ℃ sand bath, temperature fluctuation value be controlled at ± 2 ℃.Test period is greater than 72h.Result of the test is as shown in table 2.For relatively, the external typical high temperature concentrated sulfuric acid is listed in table 3-5 respectively with the decay resistance of stainless steel 700si, SX and ZeCor.
The corrosion rate of table 2 XDS stainless steel hot-rolling plate in high-temperature concentrated sulfuric acid
| Test temperature ℃ | Test period ℃ | Corrosion rate (mma -1) | |
| ω(H 2SO 4) 93% acid | ω(H 2SO 4) 98% acid | ||
| 60 | 168 | 0.00083 | 0.00035 |
| 80 | 240 | 0.00105 | 0.00052 |
| 100 | 72 | 0.0045 | 0.0020 |
| 120 | 73 | 0.00873 | 0.00228 |
| 150 | 74 | 0.026 | 0.0025 |
| 200 | 100 | 0.636 | 0.063 |
The corrosion rate mm/a of table 4 700si in high-temperature sulfuric acid
| ω(H 2SO 4) ％ | Temperature/℃ | ||||
| 100 | 125 | 15 | 175 | 200 | |
| 92 | 0.006 | 0.85 | 2.45 | 3.18 | |
| 96 | 0.003 | 0.21 | 1.0 | 1.02 | |
| 98.5 | 0.005 | 0.023 | 0.15 | ||
The corrosion rate of table 5 SX in high-temperature sulfuric acid
| Project | Temperature/℃ | ||||||
| 110 | 100 | 100 | 110 | 110 | 130 | 150 | |
| ω(H 2SO 4)，％ | 95 | 96 | 96 | 98 | 98(+so 2) | 98 | 98 |
| Corrosion rate (mma -1) | 0.10 | 0.061) | 0.052) | 0.00 | 0.02 | 0.01 | 0.08 |
Annotate: 1) as cast condition
2) as-welded
The corrosion rate of table 6 ZeCor in high-temperature sulfuric acid
| Project | Temperature ℃ | |||||||
| 60 | 60 | 71 | 105 | 115 | 115 | 143 | 200 | |
| ω(H 2SO 4)，％ | 93 | 95 | 96 | 98.5 | 99 | 96 | 96 | 98 |
| Corrosion rate/(mma -1) | 0.025 | 0.020 | 0.005 | 0.012 | 0.051 | 0.028 | 0.238 | 0.795 |
Data are compared with stainless steel with cited domestic and international high-temperature concentrated sulfuric acid as can be seen among the comparison sheet 2-5, and the XDS stainless steel has utmost point superior corrosion resistance energy.Table 7 pair several stainless steels are at 150 ℃ and 200 ℃, ω (H
2SO
2) corrosion rate in 98% sulfuric acid compares.
Several stainless corrosion rates of table 7 are mm/a relatively
| ω(H 2SO 4)98％ | 150℃ | ω(H 2SO 4)98％ | 200℃ |
| 700si | 0.005 | 700si | 0.15 |
| SX | 0.08 | ZeCor | 0.75 |
| XDS | 0.0025 | XDS | 0.063 |
No matter be not difficult to find out, in high-temperature sulfuric acid, be 150 ℃ or 200 ℃, and the stainless decay resistance of XDS all is the highest.Even under 200 ℃ high temperature, the XDS stainless steel still has excellent corrosion resisting performance.
3, local corrosion---spot corrosion and stress corrosion
A, spot corrosion.For through the long-time corrosion sample that soaks of different temperatures, under SEM, observe its erosion profile.The result shows no matter XDS is ω (H under 120 ℃
2SO
4) 93% acid is still at ω (H
2SO
4) all there is not the spot corrosion sign in 98% acid; Under 150 ℃ at ω (H
2SO
4) still there is not spot corrosion in 98% acid; At ω (H
2SO
4) begin to produce slight point corrosion at triangle crystal boundary place in 93% acid.As seen the XDS stainless steel has good pitting corrosion resistant performance in the high temperature concentrated acid.
B, stress corrosion.In order to evaluate Sensitivity of Stress Corrosion, test is undertaken by the GB/T17898-1999 regulation.Specimen size is 75mm * 15mm * 3mm.The sample side is with 150
#, 400
#, 600
#With 800
#Sand paper is polished successively, with acetone and absolute ethyl alcohol oil removing, is pressed into " U " shape sample with 80Pa pressure on universal testing machine, adopts the trip bolt stress application.In the 2000mL beaker, add the 1000mL concentrated sulfuric acid, put into 3 parallel samples, soak 72h down for 80 ℃ in temperature.Observed result shows, no matter at ω (H
2SO
4) 93% still in 98% sulfuric acid, the XDS stainless steel does not all show Sensitivity of Stress Corrosion.
Claims (2)
1, a kind of stainless steel drying and absorbing tower, comprise tower body (3), packing support plate (8) and acid separating device (6), it is characterized in that described tower body is a vertical and cylindrical, tower body is outside equipped with stiffening ring and reinforcement, packing support plate adopts the metallic grid structure, acid separating device adopts the trough-pipe type structure, Saucer Bottom is adopted in design at the bottom of the tower, described tower body, acid separating device and packing support plate adopt rare-earth element modified stainless steel manufacturing, its main chemical composition of described rare-earth element modified stainless steel is by weight: C :≤0.03%, and Si:5-8%, Cr:8-14%, Ni:15-25%, Mo:0.70-1.0%, Cu:0.7-1.0%, rare earth element :≤0.4%, but can not be 0, all the other are Fe.
2, by the described drying and absorbing tower of claim 1, it is characterized in that: described rare earth is lanthanum and cerium mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100411927A CN1327935C (en) | 2004-07-04 | 2004-07-04 | Stainless steel drying tower absorption tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100411927A CN1327935C (en) | 2004-07-04 | 2004-07-04 | Stainless steel drying tower absorption tower |
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|---|---|
| CN1593721A CN1593721A (en) | 2005-03-16 |
| CN1327935C true CN1327935C (en) | 2007-07-25 |
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|---|---|---|---|
| CNB2004100411927A Expired - Fee Related CN1327935C (en) | 2004-07-04 | 2004-07-04 | Stainless steel drying tower absorption tower |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433797B (en) * | 2008-11-28 | 2012-08-01 | 广东工业大学 | Multi-layer solid basic element absorbing tower |
| DE102011112779B3 (en) * | 2011-09-09 | 2012-05-31 | Outotec Oyj | Packed tower, useful for the absorption of water or sulfur trioxide in sulfuric acid, comprises a bed of packaged materials supported on domed grate, a gas supply pipe, an acid outlet and a mantle |
| CN103394227A (en) * | 2013-08-05 | 2013-11-20 | 河南华润电力古城有限公司 | Filter device used at desulfurizing absorption tower slurry-circulating pump inlet and filter screen of filter device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6296306A (en) * | 1985-10-22 | 1987-05-02 | Hitachi Zosen Corp | Unit apparatus for producing sulfuric acid in contact method |
| JPH0874001A (en) * | 1994-08-31 | 1996-03-19 | Nkk Corp | Stainless steel welding material for high temperature-high concentration sulfuric acid excellent in selective corrosion resistance and cold workability |
-
2004
- 2004-07-04 CN CNB2004100411927A patent/CN1327935C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6296306A (en) * | 1985-10-22 | 1987-05-02 | Hitachi Zosen Corp | Unit apparatus for producing sulfuric acid in contact method |
| JPH0874001A (en) * | 1994-08-31 | 1996-03-19 | Nkk Corp | Stainless steel welding material for high temperature-high concentration sulfuric acid excellent in selective corrosion resistance and cold workability |
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|---|---|
| CN1593721A (en) | 2005-03-16 |
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Assignee: Shanghai Aogeli Environmental Protection Engineering Co., Ltd. Assignor: Xuanda Industrial Group Co., Ltd. Contract record no.: 2011990000895 Denomination of invention: Stainless steel drying tower absorption tower Granted publication date: 20070725 License type: Exclusive License Open date: 20050316 Record date: 20110914 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070725 Termination date: 20160704 |