CN102101242A - Method for machining reformer tube - Google Patents
Method for machining reformer tube Download PDFInfo
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- CN102101242A CN102101242A CN2009102586952A CN200910258695A CN102101242A CN 102101242 A CN102101242 A CN 102101242A CN 2009102586952 A CN2009102586952 A CN 2009102586952A CN 200910258695 A CN200910258695 A CN 200910258695A CN 102101242 A CN102101242 A CN 102101242A
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Abstract
The invention relates to a method for machining a reformer tube, which comprises the following steps: batching alloy materials which are checked to be qualified, then smelting, casting, machining, welding, inspecting, testing, and further performing a hydraulic pressure test and an air tightness test without allowing the existence of leakage; and then clearing, blow-drying, finally packaging and warehousing, and achieving the designed requirements. The process is simple, the production cost is lower, and the produced reformer tube can meet the requirements on thermal stability and thermal resistance of a product after completing the machining.
Description
Technical field:
The present invention relates to a kind of processing method of conversion tube, belong to the metal smelt field.
Background technology:
Along with the development of society, human increasing to the demand of the energy, many natural resources are fewer and feweri, and energy-saving and cost-reducing is one of subject matter of facing of the world today.China is economizing on resources as fundamental state policy.Develop a circular economy, preserve the ecological environment, the resource-conserving of speeding up the construction, friendly environment society.The insider has given great concern to the exploitation manufacturing of the energy-saving equipment of hydro carbons such as production of ammonia natural gas for this reason.Specifically, the heat release that utilizes two sections conversions exactly reduces the general scale of using fire-tube type square chest reburner in the industrial reality to greatest extent for the heat absorption of one section conversion provides thermal source, thereby significantly reduces the demand of fuel gas, reaches energy saving purposes.And tube bank is the critical component of heat exchange type one-stage converter, is the main place of gas reaction, and it is welded to form by a plurality of conversion tubes.Because the boiler tube operating temperature is up to 960 ℃, reach more than the 140mm with the differential expansion of housing, so require conversion tube must have good heat endurance and hear resistance.
Summary of the invention:
Purpose of the present invention is exactly the processing method that a kind of conversion tube will be provided, and makes its conversion tube of producing can satisfy product heat endurance and stable on heating needs.The object of the present invention is achieved like this, the processing method of conversion tube, and with the alloy material batching back melting of passed examination, conversion tube is cast employed metal pattern tube through baking, and temperature is controlled at 230～250 ℃, and stenciling coating, coating layer thickness are 0.8～1mm; Conversion tube adopts spun casting, and liquid steel temperature is controlled at 1600～1640 ℃ during casting, centrifuge speed: gravity coefficient (centrifugal force/gravity) is 150～225; Adopt stainless shot to carry out Shot Blasting through cooled naturally shell, remove outer layer coating and expose the metal true qualities, keep " red bayberry particle " state, carry out the outer surface range estimation with magnifying glass (more than 5 times), standard: do not have any pore, shrinkage cavity, sand holes, crackle, slag inclusion, injurous defect such as scab; Machining is guaranteed excircle dimension, surface roughness and axiality requirement, and the arbitrary section thickest of pipeline section difference is less than 0.6mm; Welding, tube bank is the heart component of heat exchange type one-stage converter, it adopts high nichrome heat resisting steel to be welded by many conversion tubes; Check and test, the chemical composition analysis of molten steel and cast tube, the penetrant inspection of spun cast pipe outer surface, the performance test of spun cast pipe, A, the water pressure test, water quality requirement: the boiler tube test water should be clean drinking water, and temperature is not less than 5 ℃, Cl in the water
-Content is no more than 20PPm; Boiler tube should carry out the water pressure test by pressure in accordance with regulations, and pressurize is 15 minutes at least, and any sweating and seepage must not be arranged, after the water pressure test is finished, and water emptying in time, and dry up with compressed air; B, air-tight test, boiler tube pipeline section answer 100% to adopt soap class foaming agent, Cl
-Content is no more than the drinking water of 20ppm, carries out air seal test under minute condition of 0.5Mpa * 10, does not allow to exist to leak; Clear up, dry up, pack warehouse-in.Technology of the present invention is simple, and is easily manufactured, can reach higher machining accuracy requirement, can satisfy conversion tube simultaneously and have necessary good thermal stability and hear resistance.
Description of drawings:
Fig. 1 is processing process figure of the present invention
The specific embodiment:
The invention will be further described below in conjunction with processing process figure
Its technology of the present invention is that conversion tube is cast employed metal pattern tube through baking with the alloy material batching back melting of passed examination, and temperature is controlled at 230～250 ℃, and stenciling coating, coating layer thickness are 0.8～1mm; During concrete enforcement, conversion tube adopts spun casting, and centrifugal casting is that liquid metal is poured in the mould tube of rotation at a high speed, fills the mould tube and be frozen into the casting method of foundry goods under centrifugal action.Adopt the type tube of rotation at a high speed, the high nichrome cast tube of casting under action of centrifugal force, its quality is considerably beyond the static state quality of casting.Can improve institutional framework significantly, improve the continuous heat resistance energy of alloy cast tube, guarantee that each section of boiler tube has identical or close metallurgical structure, is effectively eliminated the boiler tube internal flaw.The main key points for operation of spun casting of tube bank are as follows:
(1) 1600～1640 ℃ of liquid steel temperatures (during casting) (contact thermocouple thermometric).
(2) 230～250 ℃ of type tube heating-up temperatures (resistance furnace heating, contact thermocouple is surveyed the type tube outside wall temperature).
Coating layer thickness δ=0.8～1mm when (3) spraying.
(4) centrifuge speed: gravity coefficient (centrifugal force/gravity) 150～225.
Centrifugal casting is played crucial effects with coating to the quality of centrifugal casting cast tube.Therefore the good and bad cast tube blank quality and the percent defective of directly influencing of coating quality require coating that enough hear resistances are arranged, not by the fusing of alloy liquid, scaling loss; Coating is wanted to stick to metal pattern tube surface securely, enough adhesive strengths and elevated temperature strength is arranged, and remove from cast(ing) surface easily; Suitable viscosity is arranged, and enough flowabilities and suspension are so that spraying forms uniform coating; Gas-forming property is little, produces defectives such as pore to prevent foundry goods.Adopt stainless shot to remove outer layer coating through cooled naturally shell and expose the metal true qualities, keep " red bayberry particle " state, carry out outer surface range estimation, standard with magnifying glass (more than 5 times): do not have any pore, shrinkage cavity, sand holes, crackle, slag inclusion, injurous defect such as scab.
Mechanical processing technique:
(1) conversion tube and tedge pipeline section endoporus adopt once-combined formula to draw boring, and hole dimension and surface roughness are 3.2 μ mRa to the maximum in guaranteeing.
Conversion tube: endoporus size Control: ID
-0.8 -0.5
Tedge: endoporus size Control: ID
-0.8 -0.5
(2) conversion tube and tedge pipeline section cylindrical should carry out machining, guarantee excircle dimension, surface roughness and axiality requirement, and the arbitrary section thickest of pipeline section difference is 0.6mm.
Welding procedure: tube bank is the heart component of heat exchange type one-stage converter, and it is welded by many conversion tubes.Welding quality is one of key factor that guarantees the safe operation of heat-exchanged reformer long period, and the manufacturing key of tube bank part is high nichrome heat-resistant steel welding.
Check and test:
(1) chemical composition analysis of molten steel and cast tube
(2) spun cast pipe outer surface penetrant inspection
To have stronger infiltrative penetrating fluid and be coated in component surface, and make it to ooze in tiny flaw, remove surperficial unnecessary penetrating fluid then, be coated with one deck developer afterwards again, the penetrating fluid that remains in the defective is adsorbed, demonstrate defective on the surface.Spun cast pipe is undertaken 100% to outer surface by root and carries out penetrant inspection through after the bead, guarantees without any display defect, can excise display defect, and guarantee that the length of boiler tube is minimum and be not less than 2 meters.
(3) performance test of spun cast pipe
A, normal temperature mechanical test
Spun cast pipe should carry out the normal temperature mechanical test by standard-required, and the sampling frequency and result of the test all meet standard-required.
B, high temperature, short time mechanical test
Spun cast pipe should carry out the high temperature, short time mechanical test by standard-required, and the sampling frequency and result of the test all meet standard-required.
C, high-temerature creep (or lasting) mechanical test
Spun cast pipe should carry out high-temerature creep (or lasting) mechanical test by standard-required, and the sampling frequency and result of the test all meet standard-required, and result of the test is demarcated on Larsen-Miller curve.
(4) macroscopical metallographic test
Spun cast pipe should carry out macroscopical metallographic test by standard-required, and the sampling frequency and result of the test all meet standard, drawing and specification requirement.
(5) physical dimension and surface roughness check
Boiler tube physical dimension and surface roughness all should meet drawing and technical protocol requirement.
(6) eddy-current test of cast tube inner surface
The cast tube inner surface should be through 100% eddy-current test after machining, and its result meets standard and technical protocol requirement.
(7) welding inspection
The physical dimension inspection of A, weld seam
The physical dimension of weld seam should be carried out 100% inspection by standard, and its result meets standard and technical protocol requirement.
The Non-Destructive Testing of B, weld seam
The boiler tube weld seam answers standard and drawing requirement to carry out every Non-Destructive Testing, and its result meets respective standard and technical protocol requirement.
(8) hydraulic pressure of boiler tube and air-tight test
A, the water pressure test
Water quality requirement: the boiler tube test water should be clean drinking water, and temperature is not less than 5 ℃, Cl in the water
-Content is no more than 20PPm.
The water pressure test: boiler tube should carry out the water pressure test according to the pressure of drawing regulation, and pressurize is 15 minutes at least, and any sweating and seepage must not be arranged.After the water pressure test is finished, water emptying in time, and dry up with compressed air.
B, air-tight test
The boiler tube pipeline section answers 100% to adopt soap class foaming agent, Cl
-Content is no more than the drinking water of 20ppm, carries out air seal test under minute condition of 0.5Mpa * 10, does not allow to exist to leak.
Tube bank, its manufacturing, check, examination meet relevant criterion and technical protocol requirement.It is the core component of equipment, also is the key point of conversion reaction.Can its quality directly this equipment of decision in long-term safety operation under the HTHP.The quality of molten steel in order to guarantee to smelt can adopt special-purpose deslagging agent of molten steel and the special-purpose wire gauzee filter of molten steel, guarantees the quality of molten steel purity near vacuum metling.
Claims (1)
1. the processing method of conversion tube, with the alloy material batching back melting of passed examination, conversion tube is cast employed metal pattern tube through baking, and temperature is controlled at 230～250 ℃, and stenciling coating, coating layer thickness are 0.8～1mm; Conversion tube adopts spun casting, and liquid steel temperature is controlled at 1600～1640 ℃ during casting, centrifuge speed; Gravity coefficient (centrifugal force/gravity) is 150～225; Adopt stainless shot to carry out Shot Blasting through cooled naturally shell, remove outer layer coating and expose the metal true qualities, keep " red bayberry particle " state, standard; Do not have any pore, shrinkage cavity, sand holes, crackle, slag inclusion, injurous defect such as scab; Machining is guaranteed excircle dimension, surface roughness and axiality requirement, and the arbitrary section thickest of pipeline section difference is less than 0.6mm; Welding, tube bank is the heart component of heat exchange type one-stage converter, it adopts high nichrome heat resisting steel to be welded by many conversion tubes; Check and test, the chemical composition analysis of molten steel and cast tube, the penetrant inspection of spun cast pipe outer surface, the performance test of spun cast pipe, A, the water pressure test, water quality requirement: the boiler tube test water should be clean drinking water, and temperature is not less than 5 ℃, Cl in the water
-Content is no more than 20PPm; Boiler tube should carry out the water pressure test by pressure in accordance with regulations, and pressurize is 15 minutes at least, and any sweating and seepage must not be arranged, after the water pressure test is finished, and water emptying in time, and dry up with compressed air; B, air-tight test, boiler tube pipeline section answer 100% to adopt soap class foaming agent, Cl
-Content is no more than the drinking water of 20ppm, carries out air seal test under minute condition of 0.5Mpa * 10, does not allow to exist to leak; Clear up, dry up, pack warehouse-in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102586952A CN102101242A (en) | 2009-12-17 | 2009-12-17 | Method for machining reformer tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102586952A CN102101242A (en) | 2009-12-17 | 2009-12-17 | Method for machining reformer tube |
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| CN102101242A true CN102101242A (en) | 2011-06-22 |
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|---|---|---|---|
| CN2009102586952A Pending CN102101242A (en) | 2009-12-17 | 2009-12-17 | Method for machining reformer tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106044646A (en) * | 2016-05-26 | 2016-10-26 | 合肥和安机械制造有限公司 | Manufacturing method for high-temperature-resistant forklift fixed type crane arm |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4510988A (en) * | 1981-08-21 | 1985-04-16 | Kubota Ltd. | Tube for thermal cracking or reforming hydrocarbon and manufacturing method thereof |
| CN1064425A (en) * | 1992-02-03 | 1992-09-16 | 大连机车车辆工厂配件分厂 | Alloy cast iron cylinder jacke centre spinning method and equipment |
| CN1086470A (en) * | 1992-11-03 | 1994-05-11 | 张玉华 | The centre spinning method of a kind of special steel, high-temperature alloy steel seamless pipe |
| CN1142420A (en) * | 1996-06-14 | 1997-02-12 | 张玉华 | Manufacture of alloy steel, special steel and high temperature alloy pipes |
| CN101224492A (en) * | 2007-01-19 | 2008-07-23 | 王晓瑛 | Forging method of in-wheel motor housing and techniques thereof |
-
2009
- 2009-12-17 CN CN2009102586952A patent/CN102101242A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4510988A (en) * | 1981-08-21 | 1985-04-16 | Kubota Ltd. | Tube for thermal cracking or reforming hydrocarbon and manufacturing method thereof |
| CN1064425A (en) * | 1992-02-03 | 1992-09-16 | 大连机车车辆工厂配件分厂 | Alloy cast iron cylinder jacke centre spinning method and equipment |
| CN1086470A (en) * | 1992-11-03 | 1994-05-11 | 张玉华 | The centre spinning method of a kind of special steel, high-temperature alloy steel seamless pipe |
| CN1142420A (en) * | 1996-06-14 | 1997-02-12 | 张玉华 | Manufacture of alloy steel, special steel and high temperature alloy pipes |
| CN101224492A (en) * | 2007-01-19 | 2008-07-23 | 王晓瑛 | Forging method of in-wheel motor housing and techniques thereof |
Non-Patent Citations (5)
| Title |
|---|
| 上海化学工业设计院石油化工设备设计建设组: "《石油裂解炉与制氢转化炉 炉管》", 31 December 1974 * |
| 原中华人民共和国机械工业部主编: "《GB 50273-1998 工业锅炉安装工程施工及验收规范》", 31 December 1998 * |
| 田志华: "锅炉管材的预检处理", 《锅炉技术》 * |
| 锅炉专业标准修订组: "《JB/T 1612-1994 锅炉水压试验技术条件》", 31 December 1994 * |
| 锅炉专业标准修订组: "《JB/T 1613-1993 锅炉受压元件焊接技术条件》", 31 December 1993 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106044646A (en) * | 2016-05-26 | 2016-10-26 | 合肥和安机械制造有限公司 | Manufacturing method for high-temperature-resistant forklift fixed type crane arm |
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Application publication date: 20110622 |