CN101249411A - Hydrogen making converting kiln exit port collecting tube - Google Patents

Hydrogen making converting kiln exit port collecting tube Download PDF

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Publication number
CN101249411A
CN101249411A CNA2007101786740A CN200710178674A CN101249411A CN 101249411 A CN101249411 A CN 101249411A CN A2007101786740 A CNA2007101786740 A CN A2007101786740A CN 200710178674 A CN200710178674 A CN 200710178674A CN 101249411 A CN101249411 A CN 101249411A
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China
Prior art keywords
pipe
manifold
hydrogen
temperature
outlet header
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Pending
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CNA2007101786740A
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Chinese (zh)
Inventor
姚稷天
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CNPC East China Survey Design & Research Institute
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CNPC East China Survey Design & Research Institute
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Priority to CNA2007101786740A priority Critical patent/CN101249411A/en
Publication of CN101249411A publication Critical patent/CN101249411A/en
Pending legal-status Critical Current

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Abstract

The invention relates to an outlet manifold for a petroleum chemical hydrogen production reformer. The outlet manifold is characterized in that the manifold is disposed at external bottom of the hydrogen production reformer; the manifold with a lower tail convergent position connected with a lower tail pipe is made from ZG1Cr20Ni32 high alloy material produced by a domestic centrifugal casting technique. The pipe material has high creep rupture strength, high temperature creep rupture performance of 100,000 hours, carburization resistance and high temperature plasticity, so branch-shaped eutectic niobium carbide can be formed in steel structure to hinder crack extension. The manifold has the advantages that the service life is long, the import material cost is 3-4 times higher than that of the pipe material, thereby saving 8-10% of the total investment. Ordering the domestic products facilitates observing the production capacity, tracking the product quality, visiting customers at any time and finding out the existing problems and rapid delivery and check.

Description

A kind of hydrogen making converting kiln exit port collecting tube
Technical field
The present invention relates to 1Cr20Ni32 and Cr16Ni36 import stocking that the ZG1Cr20Ni32 super-large diameter high alloy tubing of the domestic employing centrifugal casting technique of a kind of usefulness production replaces present petrochemical industry hydrogen making converting kiln exit port collecting tube to use.
Background technology
Petrochemical industry refinery hydrogen preparing device is to provide hydrogen for hydrocracking unit.Hydrogen manufacturing conversion furnace is one of nucleus equipment of device for producing hydrogen, and the hydrocarbon raw material that temperature is 500 ℃ enters reburner and contacts with the boiler tube inner catalyst, carries out cracking and conversion reaction under the condition of 800~820 ℃ of temperature and pressure 2.5MPa.Pyrolytic conversion gas is pooled to outlet header through each lower tail pipe, enters process unit again.
Outlet header is in reburner pipeline system end, at high temperature except that bearing pressure medium, also to bear the thermal expansion difference between reformer tube and tail pipe, between each reformer tube, and self two ends thermal stress of expanding and causing, its stressing conditions in whole pipe-line system is the most complicated.
The quality of outlet header operation is related to the investment and the income of hydrogenation, device for producing hydrogen.It costs an arm and a leg, and operating condition is very harsh, so selection is very important.
Converting furnace uses existing more than the 30 year history of HK-40 material, does not occur problem in the production operation.The hydrogen producing amount is less than 30dam 3The reburner of/h, its outlet header were the hot wall concetrated pipe in the past, also adopted the HK-40 material.In the high-temperature operation environment, because high-temperature aging, carbide is separated out in a large number, causes outlet header to become fragile, and can not continue to bear the bending stress that causes owing to expansion in the operation, thereby some accidents occur.Use import high alloy tubing afterwards, as do not go wrong so far always, so present converting kiln exit port collecting tube also adopts imported material always with the concetrated pipe use for export of drawn and rolled tubes such as 1Cr20Ni32, Cr16Ni36.But external order will be passed through multiple tracks formalities such as trade and investment promotion, technology negotiation, finished product reinspection and issue handling, spend many times, often therefore influences the reburner construction speed.In addition, the selling at exorbitant prices of import tubing, thereby increased construction investment.China has nearly hundred using as a servant more new material of reburner at present, and many enterprises also will build reburner.Therefore it is extremely urgent to seek a kind of outlet header tubing of not only getting well but also economizing.
Requirement to the outlet header material:
(1) outlet header at high temperature uses, and therefore requires its material to have the good high-temperature mechanical property, and higher anti-oxidant and resistance to corrosion is arranged.
(2) medium temperature height in the pipe, the outlet header temperature distortion is big, and therefore operating condition requires tubing to have good plasticity again than boiler tube harshness.
(3) the outlet header perforate is many, need tens or up to a hundred reinforced joints be connected with each time tail pipe.The manufacturing of concetrated pipe simultaneously is to produce pipeline section earlier, is spliced into needed length again, and the welding job amount is very big, so the material solderability will be got well.
(4) oil plant device for producing hydrogen hydrogen output is through the variation of being everlasting, and the reburner load is also changing, so outlet header wants to adapt to the variation of load and operating temperature.
The high chromiumnickel austenite stainless steel drawn and rolled tube of the present heavy caliber of China can't be produced, but produce centrifugal casting high-alloy tubing history for a long time, have than mature technique and experience, can the production material make outlet header with high-alloy centrifugal casting material (being called for short substitute material down) the import substitution stocking of rolling identical (1Cr20Ni32).
Summary of the invention
The objective of the invention is 1Cr20Ni32 and Cr16Ni36 import stocking that the same material ZG1Cr20Ni32 high alloy tubing with the production of domestic employing centrifugal casting technique replaces hydrogen making converting kiln exit port collecting tube to use.
Hydrogen manufacturing conversion furnace of the present invention is that 500 ℃ of hydrocarbon raw materials are contacted with catalyst in boiler tube, medium is heated to 800~820 ℃, carry out cracking and conversion reaction under the 2.5MPa condition, pyrolytic conversion gas is pooled to stove outer vent concetrated pipe through each lower tail pipe and enters process unit again.
Hydrogen manufacturing conversion furnace is made up of radiation chamber, convection cell, chimney, stove steelframe, furnace lining, reburner pipeline system (reformer tube, import and outlet header, tail pipe) up and down, convection coil and burner.Outlet header is positioned at hydrogen manufacturing conversion furnace body of heater outer bottom and is connected with following tail pipe with lower tail pipe junction.
Outlet header except that being subjected to pressure medium, the thermal stress that also will bear thermal expansion difference between reformer tube and tail pipe, between each conversion tube and self expand and cause, stressing conditions is the most complicated.
Former 1Cr20Ni32 and the Cr16Ni36 import stocking used now changes the ZG1Cr20Ni32 high alloy tubing of producing with domestic employing centrifugal casting technique into as tubing.
1. to the analysis of ZG1Cr20Ni32 high alloy tubing
(1) high alloy austenitic stainless steel drawn and rolled tube mainly is that steel pipe changes through extruding in the operation of rolling, metal structure change and redistribution, make dense structure, even, thereby steel ductility is good, the creep rupture strength height, usually the height of creep rupture strength at high temperatures as one of the leading indicator in boiler tube life-span.ZG1Cr20Ni32 has good plasticity, and the impact of being heated is higher, and high-temperature behavior is good, and it is feasible being used in the bigger outlet header position of thermal stress.
(2) spun casting tubing is that alloy liquid with fusion is poured in the type tube of speed change rotation.Under action of centrifugal force, alloy liquid is covered with type tube and rotates thereupon, and final set becomes foundry goods.Centrifugal force can make alloy feeding well, the thickness unanimity, and make field trash and gas float to the endosexine, remove weaker zone to obtain quality product through machining.The alloy crystallization of this tubing is thinner, pore-free, non-metallic inclusion and shrinkage cavity, dense structure, better mechanical property.The elements such as Nb, Ti that add trace carry out microalloying, generate stable carbide, can reduce the illeffects of carbon, improve the anti intercrystalline corrosion ability of steel, improve welding performance, strengthen the creep creep rupture strength.Add the Al element, can generate closeer oxide-film, increase its resistance to corrosion in Oxidant, behind the adding microalloy, material has higher calorific intensity and enough structure stabilities.
(3) temperature is more than 660 ℃ the time, and the creep rupture strength of ZG1Cr20Ni32 is better than Incoloy-800H hot rolling tubing.
(4) ZG1Cr20Ni32 has good welding performance, is applicable to manual electric arc welding, argon arc welding, plasma arc welding and can removes weld preheating and post weld heat treatment from as welding rod or welding wire.
2 materials as outlet header
Recent China refinery hydrogen output 20dam 3/ h hydrogen making converting kiln exit port collecting tube is used high alloy instead with material centrifugally cast pipe ZGlCr20Ni32, from the pipeline section check result, because manufactory adopts the aircraft material of scrapping, and add trace elements such as Ni, Ti, Al, the cast tube chemical composition has met or exceeded the limit of regulation.The tensile strength of this outlet header normal temperature stretching test measurement is on the low side, if but consider the wall thickness allowance, still can meet the demands.Stipulate in the U.S. ASTM A608 standard: the high-temperature behavior and the ambient temperature mechanical properties of high temperature alloy do not have dependence, generally do not recommend ambient temperature mechanical properties as checking and accepting foundation." Chinese Corrosion of Stainless Steel handbook is introduced: heat resisting steel is to use under environment of high temperature gas, removes resistance to high temperature corrosion (as high-temperature oxydation) as the necessary condition, and mechanical behavior under high temperature is to evaluate the leading indicator of heat resisting steel quality.This outlet header high temperature tension test result such as table 1.
900 ℃ of drawing by high temperature assays of table 1 casting material
Project Material Tensile strength Sb/MPa Percentage elongation/%
One group two groups three groups ??1Cr20Ni32 ??1Cr20Ni32 ??1Cr20Ni32 ????196.5 ????185.9 ????169.7 ????36 ????32 ????28.7
As shown in Table 1, the comparison of ZG14Ni32Cr20Nb material in assay and the Ministry of Chemical Industry " the high-temperature bearing centrifugal casting alloy furnace tubes by adopting technical conditions " standard, tensile strength σ bMore than the twice of the lower limit when exceeding its 900 ℃, percentage elongation exceeds 25% during than 900 ℃.
This outlet header stress rupture test is determined 900 ℃ of temperature and the controlled condition of stress 69MPa as test, measures minimum rupture time (promptly short life) and sees Table 2.
Table 2 casting material stress rupture test result
The pipe heat (batch) number Minimum rupture time/h
????93-10-223 ????93-10-225 ????93-10-236 ????11.5 ????11.2 ????4.5
The 93-10-236 duration is shorter in the table 2, may influence service life.Because tighter to the condition of test requirements document, by the testing identity to test, this pipe has reached higher level.
When calculating allowance,, get the mean value of 100,000 hours long term rupture strengths of material under the design temperature for the allowable stress of 800H stocking.For the allowable stress of cast tube, get 75% of mean value under the above-mentioned condition.Consider other unfavorable factors, the cast tube wall thickness increases by 20%.
The experiment proved that: for ZG1Cr20Ni32 tubing, as long as the centrifugal casting quality is guaranteed, welding job meets code requirement, and requires operation according to conversion process and rules, and the high-temerature creep fracture property can move 100,000 hours.If material ageing needs to change in advance, and is still worthwhile economically.
Outlet header is the material that consumption is maximum, price is the highest, often hydrogen output 20dam of import in reburner tubing 3The used outlet header of the hydrogen manufacturing conversion furnace of/h is equivalent to the 8-10% of reburner gross investment approximately just than spend more expense 3-4 times expense with ZG1Cr20Ni32 tubing.
The nickel content of HP heat resisting steel is 35%, increases by 15% than HK, can improve anti-oxidant and impervious carbon ability, also can limit the solubility of carbon in austenite, improves the creep rupture strength of tubing.Improving the breed to increase steel anti-carburizing and high-temp plastic, can make to form branch shape eutectic niobium carbide in the structure of steel, can hinder the crackle expansion, thereby improve service life.
The domestic production capacity that bigger high alloy casting material is arranged is ordered goods at home and can in time be carried out observation, the follow-up of product quality of production capacity, and visit the user at any time and understand existing problems, and acceptance of delivery etc. quickly.
Description of drawings
Fig. 1 is concetrated pipe figure under the SECTION TUBE FOR HYDROGEN MANNU-FACTURING FURNACE, among the figure:
The 1-ellipsoidal head, 2-is incubated sleeve, 3-muff tube end-plate, 4-outlet header, 5-thermocouple sheath, 6-pressure-measuring pipe, 7-filled insulation
Fig. 2 is a manifold locations front elevation under the SECTION TUBE FOR HYDROGEN MANNU-FACTURING FURNACE
Fig. 3 is a concetrated pipe position side view under the SECTION TUBE FOR HYDROGEN MANNU-FACTURING FURNACE
Among the figure: 8-outlet header, tail pipe under the 9-
Specific embodiments
Hydrogen manufacturing conversion furnace of the present invention is that 500 ℃ of hydrocarbon raw materials are contacted with catalyst in boiler tube, medium is heated to 800~820 ℃, carry out cracking and conversion reaction under the 2.5MPa condition, pyrolytic conversion gas is pooled to stove outer vent concetrated pipe through each lower tail pipe and enters process unit again.
Hydrogen manufacturing conversion furnace is made up of radiation chamber, convection cell, chimney, stove steelframe, furnace lining, reburner pipeline system (reformer tube, import and outlet header, tail pipe) up and down, convection coil and burner.Outlet header 8 is positioned at hydrogen manufacturing conversion furnace body of heater outer bottom and is connected with following tail pipe 9.
ZG1Cr20Ni32 high alloy tubing with the production of domestic employing centrifugal casting technique is produced a mouthful concetrated pipe.See Fig. 1
The 1-ellipsoidal head, 1, end socket Dg386 * 18,1Cr18Ni9Ti
2-is incubated sleeve, 1, δ=1.5, Cr25Ni20
3-muff tube end-plate, 1, δ=1.5, Cr25Ni20
The 4-outlet header, 1, seamless steel pipe Ф 406.4 * 28,1Cr20Ni32,2945kg
The 5-thermocouple sheath, 1, seamless steel pipe Ф 29 * 5, Cr25Ni20
The 6-pressure-measuring pipe, 1, seamless steel pipe Ф 29 * 5, Cr25Ni20
The 7-filled insulation, 0.06m 3Alumina cement: vermiculite=1: 8
Select the surperficial cut and the ZG1Cr20Ni32 high alloy tubing that collides the indenture that produces that does not have greater than 0.3mm of pipeline section, this concetrated pipe is welded into by three sections, length overall is 11220mm (3340+3110+4770=11220), adds technology welding evaluation materials 500mm during order in addition, and total pipe range is 11720mm.
The situation of the domestic substitute material of 1 outlet header
(1) Ba Ling petro-chemical corporation hawk mountain petrochemical plant hydrogen output 13dam 3166 * 13 * 2816,4 of/h converting kiln exit port collecting tube Ф, material is ZG1Cr20Ni32Nb, is produced by Wuchuan Holley alloy furnace tubes by adopting factory.
(2) Tianjin oil plant hydrogen output 15dam 3/ h converting kiln exit port collecting tube part of connecting pipelines adopts ZG1Cr20Ni32.
(3) the orchid refining hydrogen output 20dam of Luoyang Petrochemical engineering company design 3/ h converting kiln exit port collecting tube is Ф 406 * 28 * 11200, and material is ZG1Cr20Ni32, has come into operation year surplus in the of 10.
(4) Luoyang Petrochemical engineering company is that the hydrogen output of Liaohe River general petrochemicals factory of exploration administration design is 10dam 3The converting kiln exit port collecting tube of/h is Ф 280 * 30 * 6600, and material is ZG1Cr20Ni32.

Claims (1)

1. a hydrogen making converting kiln exit port collecting tube is positioned at hydrogen manufacturing conversion furnace body of heater outer bottom and is connected with following tail pipe with lower tail pipe junction, it is characterized in that: outlet header tubing is the ZG1Cr20Ni32 high alloy material that domestic employing centrifugal casting technique is produced.
CNA2007101786740A 2007-12-04 2007-12-04 Hydrogen making converting kiln exit port collecting tube Pending CN101249411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007101786740A CN101249411A (en) 2007-12-04 2007-12-04 Hydrogen making converting kiln exit port collecting tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007101786740A CN101249411A (en) 2007-12-04 2007-12-04 Hydrogen making converting kiln exit port collecting tube

Publications (1)

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CN101249411A true CN101249411A (en) 2008-08-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101824527A (en) * 2010-05-25 2010-09-08 江苏双勤民生冶化设备制造有限公司 Reformer tube seal head heat treatment technology

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101824527A (en) * 2010-05-25 2010-09-08 江苏双勤民生冶化设备制造有限公司 Reformer tube seal head heat treatment technology

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