CN103807844B - A kind of metallic walls cooling means contacted with high-temperature gas - Google Patents
A kind of metallic walls cooling means contacted with high-temperature gas Download PDFInfo
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- CN103807844B CN103807844B CN201410035246.2A CN201410035246A CN103807844B CN 103807844 B CN103807844 B CN 103807844B CN 201410035246 A CN201410035246 A CN 201410035246A CN 103807844 B CN103807844 B CN 103807844B
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Abstract
The present invention discloses a kind of metallic walls cooling means contacted with high-temperature gas, and step is: in metallic walls, have some discrete holes, and the side of metallic walls is connected with cooling medium, and a part of cooling medium, by convective flow, cools metallic walls; Another part cooling medium enters in high-temperature gas by discrete holes, is cooled metallic walls by liquid phase evaporation and liquid/gas film.The feature of the present invention combines cooling medium Convective heat tranfer cooling, evaporative cooling gentle/Film cooling, effective cooling is carried out to the metallic walls contacted with high-temperature gas, achieve the coupling of transient flow zone process, reduce the thermograde of metal inside, avoid and cause material thermal stress continue to increase thus damage metallic walls because metallic walls temperature difference is excessive.The present invention can be used for the metallic walls that fire tube waste heat boiler tube sheet, burner head etc. contact with high-temperature gas and cools.
Description
Technical field
The present invention relates to a kind of metallic walls cooling means, be specifically related to the effective cooling method of equipment or the part of appliance contacted with high-temperature gas.
Technical background
In chemical industry, in order to improve the efficiency of chemical plant installations, carry out byproduct steam often through the high-order sensible heat reclaiming reaction afterproduct, the higher grade comprehensive energy efficiency of byproduct steam is higher.With gaseous hydrocarbon (natural gas, shale gas, coal bed gas, casing-head gas, refinery gas, oven gas, pyrolysis gas etc.) and liquid hydrocarbon (pitch, residual oil, living beings wet goods) for raw material, be translated into by catalyzing part oxidation or non-catalytic partial oxidation technology with CO and H
2be main synthesis gas, go out the synthesis gas temperature of reburner between 900 ~ 1400 DEG C, need by arranging fire tube waste heat boiler by-product mesohigh steam.Fire tube waste heat boiler tube sheet mainly realizes the distribution of high-temperature gas, and the high-temperature synthesis gas going out reburner is carried out uniform distribution in many fire tubes, and high-temperature synthesis gas is walked in fire tube inside, and fire tube outside is boiler pond, by heat exchange by-product mesohigh steam.
Because applying working condition is complicated and severe, fire tube waste heat boiler tube sheet also exists the problems such as service life is short.Fire tube waste heat boiler tube sheet directly contacts with high-temperature gas, need cool metallic walls.The normal type of cooling adopting water forced circulation of current fire tube waste heat boiler tube sheet cooling.For maximization device, fire tube waste heat boiler tubesheet dimension comparatively large (diameter can reach more than 1 meter), cooling water is difficult to uniform distribution on tube sheet, and tube sheet local temperature may be made too high, even makes the gasification of cooling water local; Because tube sheet directly contacts with high-temperature gas, heat output is very large, and the simple heat convection that relies on is difficult to reach cooling effect rapidly.Tube sheet is due to unrealized effective cooling, and the thermal stress because of metallic walls is crossed conference and caused tube sheet to damage, and affects the service life of tube sheet.
Fire tube waste heat boiler is one of nucleus equipment of whole conversion process, and fire tube waste heat boiler tube sheet cooling problem had already become whole reforming unit and stablized bottleneck with long-cycle production and larger-scale unit.Therefore business circles expect the cooling means proposing a kind of efficient fire tube waste heat boiler tube sheet, to meet industrial needs.
Summary of the invention
The technical issues that need to address of the present invention are open a kind of metallic walls cooling means contacted with high-temperature gas, can solve the problems referred to above by the approach of perforate in metallic walls.Concrete scheme is as follows:
The metallic walls cooling means contacted with high-temperature gas, described metallic walls is provided with high-temperature gas distributing pipe, and the side of described metallic walls be high-temperature gas, opposite side is the cooling medium described metallic walls being carried out to cooling protection;
Described cooling means comprises the steps:
Described metallic walls is opened the multiple discrete holes passed through for described cooling medium, makes a part for described cooling medium cool described metallic walls, another part under differential pressure action by described discrete holes in heat convection mode on the low temperature wall of described metallic walls; In the process flowing through described discrete holes, part described cooling medium heat absorption evaporation undergoes phase transition, and cools described metallic walls by convection current cooling and vapor cooling system; When described cooling medium arrives the high-temperature wall surface of described metallic walls, form gas/liquid film in the exit of described discrete holes, described gas/liquid film cuts off the direct heat transfer between high-temperature gas and described high-temperature wall surface, carries out cooling protection to described metallic walls;
The pressure of the cooling medium of described low temperature wall side is higher than the pressure of the high-temperature gas of described high-temperature wall surface side;
The equivalent diameter of described discrete holes is 1 ~ 5 millimeter, is cylindrical or non-cylindrical; The area percentage that described discrete holes accounts for described metallic walls (1) is 5 ~ 50%.
The angle of the center line of described discrete holes and the axis of described metallic walls is more than or equal to 0 degree, is less than 90 degree.
The inclination angle of described discrete holes is arranged in a crossed manner, makes to go out interruption-forming gas/liquid film in discrete holes (3) more stable.
Described cooling medium is non-corrosiveness gas.
Described cooling medium is water, steam, process gas and to mixing with described high-temperature gas without the material that endangers.
Described metallic walls is fire tube waste heat boiler tube sheet or burner head.
The feature of metallic walls cooling means of the present invention combines cooling medium Convective heat tranfer cooling, evaporative cooling gentle/Film cooling, effective cooling is carried out to the metallic walls contacted with high-temperature gas, achieve the coupling of transient flow zone process, reduce the thermograde of metal inside, avoid and cause material thermal stress continue to increase thus damage metallic walls because metallic walls temperature difference is excessive.
Accompanying drawing explanation
Fig. 1 is the metallic walls cooling means top view of the application;
Fig. 2 is the metallic walls cooling means side view of the application;
Fig. 3 is not for establish discrete holes tube sheet inside and outside wall Temperature Distribution;
Fig. 4 is for arranging discrete holes back tube sheet inside and outside wall Temperature Distribution.
Symbol description
1 metallic walls; 2 high-temperature gas distributing pipes; 3 discrete holes;
4 high-temperature gases; 5 cooling mediums; 6 low temperature walls; 7 high-temperature wall surfaces.
Detailed description of the invention
Be below embodiments of the invention, give detailed embodiment and concrete operating process, its object is only to understand content of the present invention better.Therefore protection scope of the present invention is not by the restriction of illustrated embodiment.
See Fig. 1, metallic walls 1 is provided with high-temperature gas distributing pipe 2, and metallic walls 1 has the multiple discrete holes 3 passed through for cooling medium 5 simultaneously.
See Fig. 2, the side of metallic walls 1 is high-temperature gas 4, and opposite side is the cooling medium 5 metallic walls 1 being carried out to cooling protection.Part cooling medium 5 is with heat convection mode cool metal wall 1 on the low temperature wall 6 of metallic walls 1, and another part cooling medium 5 passes through discrete holes 3 under differential pressure action.In the process flowing through discrete holes 3, part cooling medium 5 evaporation of absorbing heat undergoes phase transition, by convection current cooling and vapor cooling system cool metal wall 1; When cooling medium 5 arrives the high-temperature wall surface 7 of metallic walls 1, form gas/liquid film in discrete holes 3 exit, gas/liquid film cuts off the direct heat transfer between high-temperature gas 4 and high-temperature wall surface 7, thus carries out cooling protection to metallic walls 1.
The center line of discrete holes 3 and the angle of metallic walls 1 axis are more than or equal to 0 degree, are less than 90 degree.The inclination angle of discrete holes 3 can be arranged in a crossed manner, makes to go out interruption-forming gas/liquid film in discrete holes 3 more stable.
The mode of laser boring can be adopted in metallic walls 1, to have some diameters in other discrete holes 3 of grade.
Cooling medium 5 can be the liquid mediums such as water, may also be the gas medium such as steam, process gas.When being liquid medium, cooling medium by Convective heat tranfer cooling, evaporative cooling gentle/Film cooling cools metallic walls 1.When being gas cooling medium, cooling medium is cooled metallic walls 1 by Convective heat tranfer cooling and gaseous film control.
The present invention can be used for the metallic walls cooling protection that fire tube waste heat boiler tube sheet, burner head etc. contact with high-temperature gas.
Embodiment 1
Fire tube waste heat boiler tube sheet diameter is 800mm, and tube sheet has the discrete holes that diameter is 3mm, and discrete holes area occupied is 10% of tube sheet area, and the center line of discrete holes and the angle of tube sheet axis are 0 degree.High-temperature synthesis gas temperature from reburner is 1300 DEG C, and pressure is 4.0MPaG.Fire tube waste heat boiler tube sheet adopts 25 DEG C of water as cooling medium, and pressure is 5.0MPaG, and cooling water flow is 200 ~ 250m3/h, and wherein the cooling water of 10% is entered in high-temperature gas by discrete holes.
Fig. 3 is not for establish discrete holes tube sheet inside and outside wall Temperature Distribution, and Fig. 4 is for arranging discrete holes back tube sheet inside and outside wall Temperature Distribution.As can be seen from Figure, after arranging discrete holes, tube sheet high-temperature wall surface temperature has been reduced to about 400 ~ 500K from 700 ~ 800K, and high-temperature wall surface temperature significantly reduces.The discrete holes pair metal tube sheets contacted with high-temperature gas is set and serves good cooling effect.
Claims (6)
1. the metallic walls cooling means contacted with high-temperature gas, is characterized in that, described metallic walls is provided with high-temperature gas distributing pipe, and the side of described metallic walls be high-temperature gas, opposite side is the cooling medium described metallic walls being carried out to cooling protection;
Described cooling means comprises the steps:
Described metallic walls is opened the multiple discrete holes passed through for described cooling medium, makes a part for described cooling medium cool described metallic walls, another part under differential pressure action by described discrete holes in heat convection mode on the low temperature wall of described metallic walls; In the process flowing through described discrete holes, part described cooling medium heat absorption evaporation undergoes phase transition, and cools described metallic walls by convection current cooling and vapor cooling system; When described cooling medium arrives the high-temperature wall surface of described metallic walls, form gas/liquid film in the exit of described discrete holes, described gas/liquid film cuts off the direct heat transfer between high-temperature gas and described high-temperature wall surface, carries out cooling protection to described metallic walls;
The pressure of the cooling medium of described low temperature wall side is higher than the pressure of the high-temperature gas of described high-temperature wall surface side;
The equivalent diameter of described discrete holes is 1 ~ 5 millimeter, is cylindrical or non-cylindrical; The area percentage that described discrete holes accounts for described metallic walls (1) is 5 ~ 50%.
2. metallic walls cooling means according to claim 1, is characterized in that, the angle of the center line of described discrete holes and the axis of described metallic walls is more than or equal to 0 degree, is less than 90 degree.
3. metallic walls cooling means according to claim 1, is characterized in that, the inclination angle of described discrete holes is arranged in a crossed manner.
4. metallic walls cooling means according to claim 1, is characterized in that, described cooling medium is non-corrosiveness gas.
5. metallic walls cooling means according to claim 1, is characterized in that, described cooling medium is the material to mixing with described high-temperature gas without endangering.
6. metallic walls cooling means according to claim 1, is characterized in that, described metallic walls is fire tube waste heat boiler tube sheet or burner head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410035246.2A CN103807844B (en) | 2014-01-24 | 2014-01-24 | A kind of metallic walls cooling means contacted with high-temperature gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410035246.2A CN103807844B (en) | 2014-01-24 | 2014-01-24 | A kind of metallic walls cooling means contacted with high-temperature gas |
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| CN103807844A CN103807844A (en) | 2014-05-21 |
| CN103807844B true CN103807844B (en) | 2016-01-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104791747B (en) * | 2015-03-25 | 2017-01-11 | 华东理工大学 | High-temperature fire tube type waste heat boiler tube plate cooling room |
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| CN102072488A (en) * | 2011-01-31 | 2011-05-25 | 哈尔滨工业大学 | High speed burner for combustion chamber with film cooling type corrugated shell structure |
| CN102878546A (en) * | 2012-07-24 | 2013-01-16 | 周丽琴 | Device and method for preventing coking, pollution and corrosion on pipeline wall surface of boiler heating surface |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060260291A1 (en) * | 2005-05-20 | 2006-11-23 | General Electric Company | Pulse detonation assembly with cooling enhancements |
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1475567A1 (en) * | 2003-05-08 | 2004-11-10 | Siemens Aktiengesellschaft | Layered structure and method to produce such a layered structure |
| EP1865259A2 (en) * | 2006-06-09 | 2007-12-12 | Rolls-Royce Deutschland Ltd & Co KG | Gas-turbine combustion chamber wall for a lean-burning gas-turbine combustion chamber |
| CN201007476Y (en) * | 2007-02-12 | 2008-01-16 | 赵晴岗 | Dual-strong breeze ignition and steady firing device |
| CN201137962Y (en) * | 2007-09-30 | 2008-10-22 | 赵晴岗 | Ultramicro oil ignition device of micro firing space |
| CN101173610A (en) * | 2007-11-16 | 2008-05-07 | 清华大学 | Heated wall surface cooling structure and gas turbine impeller vane with the same |
| CN201148909Y (en) * | 2008-01-22 | 2008-11-12 | 徐州燃烧控制研究院有限公司 | Fire coal turbine power device |
| CN101476722A (en) * | 2009-02-05 | 2009-07-08 | 程怀志 | Controllable air film double-side strong pre-heating breeze combustion device |
| CN102072488A (en) * | 2011-01-31 | 2011-05-25 | 哈尔滨工业大学 | High speed burner for combustion chamber with film cooling type corrugated shell structure |
| CN102878546A (en) * | 2012-07-24 | 2013-01-16 | 周丽琴 | Device and method for preventing coking, pollution and corrosion on pipeline wall surface of boiler heating surface |
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| CN103807844A (en) | 2014-05-21 |
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