CN102748745A - High-pressure seamless multi-internal thread boiler steel tube - Google Patents
High-pressure seamless multi-internal thread boiler steel tube Download PDFInfo
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- CN102748745A CN102748745A CN2012102611443A CN201210261144A CN102748745A CN 102748745 A CN102748745 A CN 102748745A CN 2012102611443 A CN2012102611443 A CN 2012102611443A CN 201210261144 A CN201210261144 A CN 201210261144A CN 102748745 A CN102748745 A CN 102748745A
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Abstract
The invention discloses a high-pressure seamless multi-internal thread boiler steel tube, belonging to the field of boilers. The high-pressure seamless multi-head internal thread boiler steel tube comprises a tube body with circular section; multiple internal threads are arranged on an inner wall of the tube body; the multi-internal threads have amount of 6-12, thread pitch of 20-35 mm, and lead of 180-300 mm. Water tubes provided by the invention can be applied to power station boilers so as to prevent film boiling and film boiling like phenomenon happening, effectively prevent water tubes of the boiler from being damaged by fire, and simultaneously increase heat exchange efficiency, thereby increasing capacity of heat transmission by 20-30%.
Description
Technical field
The present invention relates to a kind of pipe fitting, the water pipe that particularly a kind of boiler is used.
Background technology
In the prior art, the steel pipe that is widely used on the station boiler is as water pipe, and this steel pipe is generally seamless steel pipe; Can bear elevated pressures, water-tube boiler is established the water pipe heating surface in the drum outside, and high-temperature flue gas is mobile heat release outside pipe; Water is heat absorption in pipe, and fuel forms flame and high-temperature flue gas in the burner hearth internal combustion, often lays water screen tube on the inner surface of furnace wall; It had both been protected, and furnace wall is unlikely to be burnt out, and absorbs a large amount of radiant heat of flame and high-temperature flue gas again.。Because the cross section is outer littler than pipe in the pipe, so the carbonated drink flow velocity increases greatly, and the steam that produces on the heating surface is flushed away immediately, and this has just improved stove water heat absorption efficiency.Water-tube boiler drum diameter is little, and operating pressure is high, and boiler water cycle is good, and evaporation efficiency is high, adapts to the better performances of load variations, and the thermal efficiency is higher.Therefore, pressure is higher, and the boiler that evaporation capacity is bigger all is a water-tube boiler.
The water pipe of existing boiler is the pipe fitting of inner wall smooth, and outer wall also can be smooth, for improving heat absorption efficiency, can also weld fin on the outer wall and form finned tube; During work, water, vapour or steam water interface flow in water pipe, and flame or flue gas burn outside water pipe and flow and heat is constantly passed to the water in the water pipe; Because water pipe is fixed in boiler; It is heated and main relies on that water pipe is one-sided to be heated, and heating surface is the direction of meeting to flame or high temperature gas flow, on corresponding pipe inner wall; The water of relevant position is vaporized more easily; The water that contacts with tube wall can produce steam bubble and local boiling, and the further coalescence meeting of steam bubble is extended to continuous vapor stream, forms film boiling.This phenomenon can be seen in the evaporation tube of plain cylindrical furnace, nuclear power plant steam generator heat-transfer pipe, reactor core coolant channel.When generating steam blanket between tube wall wall and the fluid, the exchange heat that makes of steam blanket becomes very poor, so that the water pipe tube wall can reach very high temperature, and the danger of burning is arranged.
Pressure when carbonated drink density equates is called critical pressure; Water is all vaporized when critical pressure 22.1MPa is heated to 374.15 ℃; Water becomes steam does not need the latent heat of vaporization; Be that water becomes steam without Evaporation Phenomenon, this temperature is called critical-temperature, or is referred to as phase point temperature (phase point temperature during supercritical pressure 24.5--27.5MPa is 380--410 ℃).Near phase point temperature, exist a high specific hot-zone, the working medium rerum natura is undergone mutation in this district: the working medium density of abuts might be much littler than the working medium density that is flowing in tube hub, promptly in flow section, exists the inhomogeneities of working medium.When heating surface thermic load height arrives a certain numerical value, possibly cause heat transfer deterioration in the place of being close to wall, this phenomenon type of being referred to as film boiling phenomenon.For avoiding this phenomenon, boiler transformation temperature zone is designed in the relatively low place of thermic load usually, or improves the flow velocity of working medium.
Film boiling and type film boiling phenomenon mainly occur in main heating surface one side of water pipe, consequently cause water pipe localized burn, the thermal efficiency to reduce.And deviating from the opposite side of main heating surface, this phenomenon then takes place less.
Summary of the invention
The purpose of this invention is to provide a kind of high-pressure seamless multiple-internal screw thread seamless steel tube for boiler, make it can reduce film boiling and type film boiling phenomenon to the full extent, improve the thermal efficiency and protect boiler water tube not receive scaling loss.
The objective of the invention is to realize like this: a kind of high-pressure seamless multiple-internal screw thread seamless steel tube for boiler; Comprise the body that section is rounded, said inboard wall of tube body is provided with multiple-internal screw thread, and a number of multiple-internal screw thread is 6 ~ 12; Pitch is 20 ~ 35mm, and helical pitch is 180 ~ 300mm.
Water pipe of the present invention can be applicable on the station boiler of high pressure; During its work; High-Pressure Water is out-of-date from the pipe inner wall surface current, under the guide effect of multiple-internal screw thread, presses close to the circumferential speed rotation of the current of pipe inner wall with 0.05 ~ 0.1m/s; It can be with the heat of main heating surface one side absorbent from heating surface rapidly, makes it pass to the water of other parts in the body; The jet density of body ectonexine is little, and the jet density of internal layer is big, under the effect of rotary centrifugal force; Internal layer water has the trend of outside motion; The trend of the oriented central motion of outer water interacts down, the further heat convection of meeting; In time institute's received heat is led away, avoid producing film boiling and type film boiling.Because the axial flow velocity of current is generally 0.3 ~ 1.5m/s much larger than its rotary speed, the skin in body receives the retardance of tube wall; Current are rotation and prompt drop is low at axial side upper reaches, and in the body center, water velocity is bigger; Current are when crossing the top of each internal thread; Root at internal thread can produce a vortex, and the vortex can promote transposition between internal layer and the outer field water, thereby makes heat transfer efficiency higher.A number of multiple-internal screw thread is 6 ~ 12, is in order to guarantee that current can cross each internal thread one by one, to produce abundant vortex; Pitch is 20 ~ 35mm, and helical pitch is that 180 ~ 300mm is in order to guarantee that current can be with the circumferential speed rotation of 0.05 ~ 0.1m/s, compared with prior art; Beneficial effect of the present invention is: it is applied on the water-tube boiler; Can reduce the generation of film boiling and type film boiling phenomenon, effectively protect boiler water tube not receive scaling loss, simultaneously; It has improved heat exchange efficiency, and capacity of heat transmission can increase by 20 ~ 30%.
Use reliably for further guaranteeing, said multiple-internal screw thread is a trapezoidal thread, and land width is 5 ~ 10mm, screw thread bottom width 15 ~ 25mm.The screw thread of this structure is difficult for having been improved service life by current scour or corrosion.
For forming enough current of rotation flow velocity, the thread depth of said trapezoidal thread is 1 ~ 1.5mm.
For further avoiding corrosion, the top and the root of said trapezoidal thread are round-corner transition, radius of corner 0.1 ~ 1.2mm.In the round-corner transition position, as adopting corner angle, then water is prone to production cavitation damage phenomenon near this position, causes water pipe to damage, and adopts round-corner transition, and the end reduces the cavitation damage phenomenon to greatest extent.
For guaranteeing that body is easily manufactured and have enough intensity, said body external diameter is 40 ~ 80mm, and the minimum diameter of body with the ratio of body external diameter is: 0.55 ~ 0.65.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The specific embodiment
Embodiment 1
As shown in the figure, for a kind of high-pressure seamless multiple-internal screw thread seamless steel tube for boiler, comprise the rounded body of section 2, the inwall of body 2 is provided with multiple-internal screw thread 1, and a number of multiple-internal screw thread 1 is 6, and pitch is 20mm, and helical pitch is 180mm; Multiple-internal screw thread is a trapezoidal thread, and land width W1 is 5mm, and the wide W2 of thread root is 15mm; The thread depth h of trapezoidal thread is 1mm; The top and the root of trapezoidal thread are round-corner transition, and radius of corner is 0.1mm.The body external diameter is 40mm, and the minimum diameter of body with the ratio of body external diameter is: 0.55.
Embodiment 2
A kind of high-pressure seamless multiple-internal screw thread seamless steel tube for boiler comprises the body that section is rounded, and said inboard wall of tube body is provided with multiple-internal screw thread, and a number of multiple-internal screw thread is 12, and pitch is 35mm, and helical pitch is 300mm; Multiple-internal screw thread is a trapezoidal thread, and land width is 10mm, the wide 25mm of thread root; The thread depth of trapezoidal thread is 1.5mm; The top and the root of trapezoidal thread are round-corner transition, and radius of corner is 1.2mm.The body external diameter is 80mm, and the minimum diameter of body with the ratio of body external diameter is: 0.65.
Embodiment 3
A kind of high-pressure seamless multiple-internal screw thread seamless steel tube for boiler comprises the body that section is rounded, and said inboard wall of tube body is provided with multiple-internal screw thread, and a number of multiple-internal screw thread is 8, and pitch is 25mm, and helical pitch is 220mm; Multiple-internal screw thread is a trapezoidal thread, and land width is 8mm, the wide 20mm of thread root; The thread depth of trapezoidal thread is 1.2mm; The top and the root of trapezoidal thread are round-corner transition, and radius of corner is 0.5mm.The body external diameter is 60mm, and the minimum diameter of body with the ratio of body external diameter is: 0.6.
Embodiment 4
A kind of high-pressure seamless multiple-internal screw thread seamless steel tube for boiler comprises the body that section is rounded, and said inboard wall of tube body is provided with multiple-internal screw thread, and a number of multiple-internal screw thread is 10, and pitch is 35mm, and helical pitch is 280mm; Multiple-internal screw thread is a trapezoidal thread, and land width is 10mm, the wide 15mm of thread root; The thread depth of trapezoidal thread is 1.5mm; The top and the root of trapezoidal thread are round-corner transition, and radius of corner is 0.3mm.The body external diameter is 80mm, and the minimum diameter of body with the ratio of body external diameter is: 0.55.
Be the running parameter of above-mentioned each seamless steel tube for boiler below, it is arranged on the station boiler of 300MW:
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Prior art (light pipe) |
| Boiler working pressure (MPa) | 16.7 | 16.7 | 16.7 | 16.7 | 16.7 |
| Axial water velocity (m/s) | 1.0 | 1.0 | 1.0 | 1.0 | 1 |
| Circumferential water velocity (m/s) | 0.05 | 0.1 | 0.08 | 0.08 | 0 |
| Capacity (t/h) | 1150 | 1250 | 1190 | 1200 | 1000 |
| Water pipe service life (h) | 11000 | 11000 | 11000 | 11000 | 8000 |
Above-mentioned result of the test shows, adopts multiple-internal screw thread seamless steel tube for boiler of the present invention, can obviously prolong the service life of water pipe, and the raising capacity improves the thermal efficiency.
The present invention is not limited to the foregoing description; On the basis of technical scheme disclosed by the invention; Those skilled in the art is according to disclosed technology contents; Do not need performing creative labour just can make some replacements and distortion to some technical characterictics wherein, these replacements and distortion are all in protection scope of the present invention.
Claims (5)
1. a high-pressure seamless multiple-internal screw thread seamless steel tube for boiler comprises the body that section is rounded, and it is characterized in that: said inboard wall of tube body is provided with multiple-internal screw thread, and a number of multiple-internal screw thread is 6 ~ 12, and pitch is 20 ~ 35mm, and helical pitch is 180 ~ 300mm.
2. high-pressure seamless multiple-internal screw thread seamless steel tube for boiler according to claim 1 is characterized in that: said multiple-internal screw thread is a trapezoidal thread, and land width is 5 ~ 10mm, the wide 15 ~ 25mm of thread root.
3. high-pressure seamless multiple-internal screw thread seamless steel tube for boiler according to claim 2 is characterized in that: the thread depth of said trapezoidal thread is 1 ~ 1.5mm.
4. high-pressure seamless multiple-internal screw thread seamless steel tube for boiler according to claim 3 is characterized in that: the top and the root of said trapezoidal thread are round-corner transition, and radius of corner is 0.1 ~ 1.2mm.
5. according to any described high-pressure seamless multiple-internal screw thread seamless steel tube for boiler of claim 1 ~ 4, it is characterized in that: said body external diameter is 40 ~ 80mm, and the minimum diameter of body with the ratio of body external diameter is: 0.55 ~ 0.65.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102611443A CN102748745A (en) | 2012-07-26 | 2012-07-26 | High-pressure seamless multi-internal thread boiler steel tube |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102611443A CN102748745A (en) | 2012-07-26 | 2012-07-26 | High-pressure seamless multi-internal thread boiler steel tube |
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| CN102748745A true CN102748745A (en) | 2012-10-24 |
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| CN2012102611443A Pending CN102748745A (en) | 2012-07-26 | 2012-07-26 | High-pressure seamless multi-internal thread boiler steel tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106524814A (en) * | 2016-12-19 | 2017-03-22 | 西安交通大学 | Wide load boiler water cooled wall internal threaded pipe with fins with arc-shaped transition sections |
| US11156908B2 (en) | 2017-03-03 | 2021-10-26 | Appotronics Corporation Limited | Light source device and projection display system thereof for adjustment of white balance |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2187775Y (en) * | 1993-10-22 | 1995-01-18 | 肖克建 | Copper-saving inner-screw heat-transmission tube |
| CN101149240A (en) * | 2006-09-19 | 2008-03-26 | 宝山钢铁股份有限公司 | Supercritical or ultra-supercritical boiler water cooling wall inner thread steel pipe and its manufacture method |
| CN102513388A (en) * | 2011-11-30 | 2012-06-27 | 常州盛德无缝钢管有限公司 | Manufacture method for inner-threaded steel pipe applied to supercritical or ultra supercritical fossil power unit |
| CN102563220A (en) * | 2010-12-16 | 2012-07-11 | 株式会社新三兴钢管 | Threaded steel pipe for piping |
| CN202733869U (en) * | 2012-07-26 | 2013-02-13 | 江苏天元钢管有限公司 | Boiler water pipe |
-
2012
- 2012-07-26 CN CN2012102611443A patent/CN102748745A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2187775Y (en) * | 1993-10-22 | 1995-01-18 | 肖克建 | Copper-saving inner-screw heat-transmission tube |
| CN101149240A (en) * | 2006-09-19 | 2008-03-26 | 宝山钢铁股份有限公司 | Supercritical or ultra-supercritical boiler water cooling wall inner thread steel pipe and its manufacture method |
| CN102563220A (en) * | 2010-12-16 | 2012-07-11 | 株式会社新三兴钢管 | Threaded steel pipe for piping |
| CN102513388A (en) * | 2011-11-30 | 2012-06-27 | 常州盛德无缝钢管有限公司 | Manufacture method for inner-threaded steel pipe applied to supercritical or ultra supercritical fossil power unit |
| CN202733869U (en) * | 2012-07-26 | 2013-02-13 | 江苏天元钢管有限公司 | Boiler water pipe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106524814A (en) * | 2016-12-19 | 2017-03-22 | 西安交通大学 | Wide load boiler water cooled wall internal threaded pipe with fins with arc-shaped transition sections |
| US11156908B2 (en) | 2017-03-03 | 2021-10-26 | Appotronics Corporation Limited | Light source device and projection display system thereof for adjustment of white balance |
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Application publication date: 20121024 |