CN104807359A - Built-in multi-stage jet pipe type fin heat exchange pipe and manufacturing process thereof - Google Patents
Built-in multi-stage jet pipe type fin heat exchange pipe and manufacturing process thereof Download PDFInfo
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- CN104807359A CN104807359A CN201410041427.6A CN201410041427A CN104807359A CN 104807359 A CN104807359 A CN 104807359A CN 201410041427 A CN201410041427 A CN 201410041427A CN 104807359 A CN104807359 A CN 104807359A
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Abstract
The invention provides a built-in multi-stage jet pipe type fin heat exchange pipe. The built-in multi-stage jet pipe type fin heat exchange pipe comprises a fin pipe, and a multi-stage jet pipe mounted in the fin pipe, wherein the multi-stage jet pipe comprises at least two second-stage jet pipes which are coaxially connected in series; an opening is formed in one end of each second-stage jet pipe, and an annular sealing cover is welded on the outer wall of the opening end; a bottom cover is welded at the other end of each second-stage jet pipe; the opening ends of the second-stage jet pipes are toward the same direction and in the direction opposite to the cold liquid flowing direction; a certain of space is set between every two adjacent second-stage jet pipes, and the every two adjacent second-stage jet pipes are fixedly connected in series through a pulling rod to form the multi-stage jet pipe; a spraying hole is formed in the wall of each second-stage jet pipe. According to the built-in multi-stage jet pipe type fin heat exchange pipe, the convection heat exchange in the pipe is enhanced through the multi-stage jet pipe; the heat transfer is enhanced at the outside of the pipe by a manner of increasing the heat exchange area through welding fins; therefore, the total heat exchange efficiency can be obviously increased; the heat exchange pipes can be connected in parallel and flexibly designed to be large, medium and small-size heat exchangers according to the demand of the production process.
Description
Technical field
The present invention relates to the heat transmission equipment in multiple fields such as chemical industry, metallurgy and energy-conserving and environment-protective, particularly relate to a kind of built-in multistage jet flow tubular type fin heat exchange pipe and manufacturing process thereof.
Background technology
Along with developing rapidly of modern industry, countries in the world are generally faced with shortage of energy problem, tap a new source of energy and common concern that how the existing energy of efficiency utilization obtains countries in the world.Due to heat transmission equipment extensive use in the industrial production, improve heat exchanger efficiency, the new technology of research enhanced heat exchange becomes the new problem of thermal conduction study of people's growing interest.The application not only energy-conserving and environment-protective of heat transfer enhancement technology, and saved investment and operation cost.
According to statistics, in steam power plant, if using boiler also as heat transmission equipment, then the investment of heat exchanger accounts for about 70% of the gross investment of whole power plant.In modern petrochemical enterprise, the investment of heat exchanger accounts for 30% ~ 40% of plant construction gross investment.The research to new and effective heat transmission equipment is constantly engaged in countries in the world, to improving heat utilization rate, the consumption of continuous reduction natural energy source, therefore heat exchanger has very important material impact in the economic benefit of the construction investment and raising enterprise that reduce enterprise.
1, the object of augmentation of heat transfer
(1) heat transfer area of just design is reduced, to reduce the volume and weight of heat exchanger;
(2) exchange capability of heat of existing heat exchanger is improved;
(3) heat exchanger is made can to work under comparatively Low Temperature Difference;
(4) heat exchanger resistance is reduced, to reduce the power consumption of heat exchanger.
2, the augmentation of heat transfer approach of surface-type heat exchanger
Heat output during heat exchanger steady heat transfer can be expressed as with the heat transfer equation in thermal conduction study:
Q=kAΔT （1）
In formula, Q-heat output, W;
K-heat transfer coefficient, W/ (m
2k);
A-heat exchange area, m
2;
The mean temperature difference of Δ T-cold fluid and hot fluid, K.
Formula (1) shows, make diabatic process strengthening in heat exchanger, realize by three kinds of approach, that is: increase mean temperature difference, increase heat exchange area and improve the coefficient of heat transfer.
According to the difference of fluid flow state, monophasic fluid is also different in the augmentation of heat transfer means of Bottomhole pressure.For the heat exchange of strengthening Laminar Flow, should, with the flow regime of alter for Main Means, fluid be made to become turbulent flow.For the heat exchange of strengthening turbulent flow, main principle should be the thickness of attenuated layer laminar sublayer.Injection heat transfer is adopted to be one of most effective way of strengthening intraductal heat exchange.
The operation principle of injection heat transfer is: hot fluid flows through heat exchanger, heat is passed to the outer tube of heat exchanger tube, cold fluid flow to jet pipe through packaged air conditioner, the inner surface of outer tube is sprayed to again from spray orifice high velocity vertical, under the percussion of air-flow, laminar boundary layer turbulent flowization between cold fluid and outer pipe internal surface, thus enhances convection heat transfer' heat-transfer by convection, improves efficiency of heat exchanger.
In current industrial production, the normal efflux heat-exchanger adopted described in 1986 metallurgical publishing house " heat-exchange device used for industrial furnace ", its structure is made up of three layers of concentric tubes and flue gas and hot-air outlet box.Interior pipe is air jet pipe, and outer tube is flue gas jet pipe, and intermediate casing is heat-exchange tube.Air vertically sprays to the inner surface of heat-exchange tube from the spurt hole of interior pipe sidewall, the outer surface that flue gas vertically sprays to heat-exchange tube from the spray orifice of outer tube wall carries out adding hot-air, by the air after heating along vertical upflow in the annular space between interior pipe and heat-exchange tube.Owing to adopting a jet flow, hot-air fluid layer must affect the effect of injection heat transfer.Be difficult to improve preheating of air temperature.Simultaneously outer tube flue gas jet flow need be joined heat resisting exhauster and also be there is certain technical difficulty to raise flue gas pressures, also affects the service life of heat resisting exhauster.
Number of patent application is 201110143926.2 " heat exchanger tube realizing same inlet/outlet temperature difference jet type air preheaters ", number of patent application is 91205751.3 " single tube insert type bar-shaped heat exchangers ", number of patent application is that the item patents such as 87208214.8 " a kind of spray type pipe heat exchangers " are and take eruption mode to carry out enhanced heat exchange in heat exchanger tube, and do not take enhanced heat exchange measure outward at heat exchanger tube, therefore significantly cannot improve integrated heat transfer coefficient.
Number of patent application is 201210226605.3 " triple-travel air preheat radiant tube burner heat exchanger ", number of patent application is 201210226661.7 " two-pass air preheat radiant tube burner heat exchanger ", number of patent application is 201210267069.1 " the two preheating secondary injection formula radiant tube burner heat exchanger of space gas and heat-exchange methods ", number of patent application is 201210268147.x " the two preheating fin tube type radiant tube burner heat exchanger of space gas and heat-exchange method ", number of patent application is that the item patents such as 201220373278.x " radiant tube burner heat exchanger with finned tube " are microminiature burner heat exchanger, complex structure, and all need to adopt numerical control fine finishining, manufacturing cost is expensive.Therefore, for application big-and-middle-sized heat exchanger in the industrial production, without actual application value.
Number of patent application is 201110003743.0 " for the heat exchanger tube of evaporimeter and the evaporimeters of composition thereof " is for the evaporimeter in refrigeration plant, pipe is outer does not take enhanced heat exchange measure, significantly cannot improve integrated heat transfer coefficient, therefore cannot be applied in industrial production the big-and-middle-sized heat exchanger carrying out waste heat recovery.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the invention provides a kind of built-in multistage jet flow tubular type fin heat exchange pipe and manufacturing process thereof, in pipe, being provided with multistage jet pipe, improve the convection transfer rate in pipe, enhance intraductal heat exchange; Install fin additional at the outer wall of outer tube, add heat exchange area, enhance heat transfer outside a tube, namely in heat transfer equation when mean temperature difference is constant, both improve integrated heat transfer coefficient, turn increased heat exchange area, improve the comprehensive heat exchange property of heat exchanger tube.
Built-in multistage jet flow tubular type fin heat exchange pipe provided by the present invention, comprises finned tube and is arranged on the jet pipe in finned tube, it is characterized in that: described jet pipe is multistage jet pipe, comprises the sub-cascade pipe of at least two concentric serial connections.
Further, the open at one end of each sub-cascade pipe, the other end is provided with bottom and closes, and each sub-cascade pipe opening end is towards unanimously, and contrary with the flow direction of cold fluid; Stay at regular intervals between adjacent two sub-cascade pipes, and fix serial connection by a pull bar and be integrated; The outer wall of each sub-cascade pipe near its opening end place is provided with annular capping, and this annular capping contacts with finned tube inwall circumference; The opening area of the spray orifice of each sub-cascade pipe is limited on the tube wall between described annular capping and bottom.
Further, be arranged at the sub-cascade pipe of the first order of cold fluid inlet end, its annular capping flushes with described finned tube end surfaces and welds, and the annular capping of its minor cascade pipe is not welded with described finned tube.Cold fluid flow is when heat exchanger tube, directly enter from the opening end of the sub-cascade pipe of the first order, and spray to the internal face of finned tube by spray orifice, carry out high efficient heat exchanging, and the opening end of the sub-cascade pipe of next stage is flowed into by annular crack, repeat above-mentioned enhanced heat exchange process so step by step.
Further, each sub-cascade pipe and described finned tube are coaxially installed; Described pull bar is arranged at each sub-cascade pipe bottom shaft core position and welds.
Further, the aperture of described spray orifice is 1 ~ 10mm; The percent opening of the spray orifice of described each sub-cascade pipe is 10% ~ 30%(note: percent opening refers to the nozzle hole area that this sub-cascade pipe is offered and the ratio amassed with this sub-cascade tube-surface).
Further, between the area cascade pipe adjacent with ≈ that spray orifice offered by the interior cross-sectional area ≈ every grade sub-cascade pipe that the circular cylindrical cross-section between described finned tube and sub-cascade pipe amasss ≈ every grade sub-cascade pipe imagination exist and the surface area of the isodiametric pipe of sub-cascade pipe.
Further, the fin that the outside wall surface of described finned tube is welded is ratio-frequency welding helical fin or nest plate.Finned tube can level, vertical or be in tilted layout.The height of fin is 5 ~ 30mm, and pitch is 5 ~ 25mm, and thickness is 0.5 ~ 5mm.
The present invention also provides a kind of built-in multistage jet flow tubular type fin heat exchange pipe manufacturing process, comprises the following steps:
(1) making of finned tube: the finned tube making required specification by manufacturing technique requirent;
(2) making of each sub-cascade pipe: at one end of sub-cascade pipe welding bottom, bottom opens centre bore, and the other end is uncovered; Again annular capping is welded on the outer wall of described sub-cascade pipe opening end, and the tube wall of sub-cascade pipe between described bottom and annular capping offers spray orifice;
(3) assembly welding of multistage jet pipe: by pull bar through the centre bore of each sub-cascade pipe bottom, guarantee that each sub-cascade pipe opening end is towards unanimously, then welded step by step by the bottom of pull bar with each sub-cascade pipe, serial connection is integrated, and becomes multistage jet pipe; Stay at regular intervals between adjacent sub-cascade pipe;
(4) assembling of built-in multistage jet flow tubular type fin heat exchange pipe: the inside of multistage jet pipe being inserted finned tube, guarantees that the opening end of each sub-cascade pipe is contrary with the flow direction of cold fluid; The sub-cascade pipe of the first order is placed in cold fluid inlet end, and its annular capping flushes with described finned tube end surfaces and welds, and the annular capping of all the other each sub-cascade pipes is not all welded with finned tube inner surface.
Compared with prior art, tool has the following advantages in the present invention:
1, multistage jet pipe is adopted in heat exchanger tube, cold fluid enters first order jet pipe from the arrival end of fin heat exchange pipe, the inner surface vertically spraying to finned tube from spray orifice again carries out high efficient heat exchanging, and flow through jet pipe at different levels step by step successively, flow out from the other end of fin heat exchange pipe after carrying out heat exchange with horizontal hot fluid of plunderring finned tube outer surface, laminar boundary layer turbulent flowization between cold fluid and finned tube inner surface, thus enhances convection heat transfer' heat-transfer by convection, improves heat exchange efficiency.
2, heat exchange pipe external surface adopts extended surface method to form finned tube, expands the heat exchange area of heat-transfer surface, and promotes the disturbance of hot fluid and reduce heat transfer resistance, effectively increase heat transfer coefficient, thus increases heat output, augmentation of heat transfer.
3, built-in multistage jet flow tubular type fin heat exchange pipe provided by the present invention, as a kind of high-performance heat transfer components, can adopt parallel way as required, flexible design becomes large, medium and small type heat exchanger, is applied to required production link.
Accompanying drawing explanation
Fig. 1 is built-in multistage jet flow tubular type fin heat exchange pipe structural representation of the present invention;
Fig. 2 is multistage jet pipe structural representation of the present invention.
In figure: 1-finned tube; 2-fin; The multistage jet pipe of 3-; 4-spray orifice; 5-bottom; 6-pull bar; The capping of 7-annular; The sub-cascade pipe of the 8-first order.
Detailed description of the invention
As shown in Figure 1, 2, built-in multistage jet flow tubular type fin heat exchange pipe provided by the present invention, comprises finned tube 1, is provided with multistage jet pipe 3 in the inside of finned tube, and multistage jet pipe 3 comprises the sub-cascade pipe of at least two concentric serial connections; The open at one end of each sub-cascade pipe, and on the outer wall at opening end place, weld annular capping 7, other end welding has the bottom 5 of centre bore, and each sub-cascade pipe opening end is towards unanimously, contrary with the flow direction of cold fluid; By pull bar 6 centre bore through each sub-cascade pipe bottom 5, guarantee to stay between adjacent two sub-cascade pipes at regular intervals, then welded step by step by the bottom 5 of pull bar 6 with each sub-cascade pipe, serial connection is integrated, and becomes multistage jet pipe 3.Tube wall between the annular capping 7 of each sub-cascade pipe and bottom 5 offers spray orifice 4.The aperture of spray orifice 4 can be 1 ~ 10mm, and the percent opening of the spray orifice of each sub-cascade pipe is 10% ~ 30%, and the nozzle hole area namely this sub-cascade pipe offered and the ratio long-pending with this sub-cascade tube-surface are 10%-30%.
Be arranged at the annular capping 7 of the first order sub-cascade pipe 8 of cold fluid inlet end, flush with the end surfaces of described finned tube 1 and weld, the annular capping 7 of all the other each sub-cascade pipes is not all welded with the inner surface of finned tube 1.
The fin 2 that the outside wall surface of finned tube 1 is welded is ratio-frequency welding helical fin or nest plate, and the height of fin is 5 ~ 30mm, and pitch is 5 ~ 25mm, and thickness is 0.5 ~ 5mm.Finned tube 1 can level, vertical or be in tilted layout.
The progression of the multistage jet pipe 3 in the present invention is determined according to the resistance drop of the flow of cold and hot fluid and heat-exchange system.If the flow of cold and hot fluid is comparatively large, and when resistance drop allows larger, progression can suitably increase.Between the area cascade pipe adjacent with ≈ that spray orifice offered by the interior cross-sectional area ≈ every grade sub-cascade pipe that between described finned tube 1 and sub-cascade pipe, the circular cylindrical cross-section of (that is, and between multistage jet pipe 3) amasss ≈ every grade sub-cascade pipe imagination exist and the surface area (referring to the surface area of the pipe shown in dotted line A in accompanying drawing 2) of the isodiametric pipe of sub-cascade pipe.Usually certain one-level sub-cascade pipe offers multiple spray orifice, so-called every grade of sub-cascade pipe offer spray orifice area and, refer to the area sum of the multiple spray orifices on this sub-cascade pipe.
The manufacturing process of built-in multistage jet flow tubular type fin heat exchange pipe provided by the present invention, comprises the following steps:
(1) making of finned tube 1: the finned tube 1 making required specification by manufacturing technique requirent;
(2) making of each sub-cascade pipe: at one end of sub-cascade pipe welding bottom 5, bottom 5 opens centre bore, and the other end is uncovered; Annular capping 7 is welded on the outer wall of described sub-cascade pipe opening end again, and the tube wall of sub-cascade pipe between described bottom 5 and annular capping 7 offers spray orifice 4;
(3) assembly welding of multistage jet pipe 3: by the centre bore of pull bar 6 through each sub-cascade pipe bottom 5, guarantee that each sub-cascade pipe opening end is towards unanimously, welded step by step by the bottom 5 of pull bar 6 with each sub-cascade pipe, serial connection is integrated, and becomes multistage jet pipe 3 again.Stay at regular intervals between adjacent two sub-cascade pipes;
(4) assembling of built-in multistage jet flow tubular type fin heat exchange pipe and manufacturing process thereof: the inside of multistage jet pipe 3 being inserted finned tube 1, guarantees that the opening end of each sub-cascade pipe is contrary with the flow direction of cold fluid.The sub-cascade pipe 8 of the first order is placed in cold fluid inlet end, and its annular capping 7 flushes with described finned tube 1 end surfaces and welds, and the annular capping 7 of all the other each sub-cascade pipes is not all welded with finned tube 1 inner surface.
Specific works mode of the present invention is: cold fluid directly enters the opening end of the sub-cascade pipe 8 of the first order, the inner surface vertically spraying to finned tube 1 from spray orifice 4 again carries out high efficient heat exchanging, and flow through each sub-cascade pipe successively step by step, after carrying out heat exchange with horizontal hot fluid of plunderring finned tube 1 outer surface, then flow out from the other end of fin heat exchange pipe.Laminar boundary layer turbulent flowization between cold fluid and finned tube 1 inner surface, thus enhances convection heat transfer' heat-transfer by convection, improves heat exchange efficiency.
Heat exchange pipe external surface adopts extended surface method to form finned tube 1, expands the heat exchange area outside pipe, and promotes the disturbance of hot fluid and reduce heat transfer resistance, effectively increase heat transfer coefficient, thus increases heat output, augmentation of heat transfer.
The present invention has all carried out augmentation of heat transfer in pipe, outside pipe, and total heat exchange efficiency is able to significant raising.
Claims (8)
1. a built-in multistage jet flow tubular type fin heat exchange pipe, comprises finned tube and is arranged on the jet pipe in finned tube, it is characterized in that: described jet pipe is multistage jet pipe, comprises the sub-cascade pipe of at least two concentric serial connections.
2. built-in multistage jet flow tubular type fin heat exchange pipe as claimed in claim 1, it is characterized in that: the open at one end of described each sub-cascade pipe, other end bottom is closed, each sub-cascade pipe opening end towards unanimously, and contrary with the flow direction of cold fluid; Leave gap between adjacent sub-cascade pipe, and fix serial connection by a pull bar and be integrated; The outer wall at each sub-cascade pipe opening end place is provided with annular capping, and this annular capping contacts with finned tube inwall circumference; The opening area of the spray orifice of each sub-cascade pipe is limited on the tube wall between described annular capping and bottom.
3. built-in multistage jet flow tubular type fin heat exchange pipe as claimed in claim 2, it is characterized in that: the sub-cascade pipe of the first order being arranged at cold fluid inlet end, its annular capping flushes with the end surfaces of described finned tube and welds, and the annular capping of its minor cascade pipe is not welded with described finned tube.
4. built-in multistage jet flow tubular type fin heat exchange pipe as claimed in claim 2 or claim 3, is characterized in that: each sub-cascade pipe and described finned tube are coaxially installed; Described pull bar is arranged at each sub-cascade pipe bottom shaft core position and welds.
5. built-in multistage jet flow tubular type fin heat exchange pipe as claimed in claim 2 or claim 3, is characterized in that: the aperture of described spray orifice is 1 ~ 10mm; The percent opening of the spray orifice of described each sub-cascade pipe is 10% ~ 30%.
6. the built-in multistage jet flow tubular type fin heat exchange pipe as described in claim 1,2 or 3, is characterized in that: between the area cascade pipe adjacent with ≈ that spray orifice offered by the interior cross-sectional area ≈ every grade sub-cascade pipe that the circular cylindrical cross-section between described finned tube and sub-cascade pipe amasss ≈ every grade sub-cascade pipe imagination exist and the surface area of the isodiametric pipe of sub-cascade pipe.
7. the built-in multistage jet flow tubular type fin heat exchange pipe as described in claim 1,2 or 3, it is characterized in that: the fin that the outside wall surface of described finned tube is welded is ratio-frequency welding helical fin or nest plate, the height of fin is 5 ~ 30mm, and pitch is 5 ~ 25mm, and thickness is 0.5 ~ 5mm.
8. a built-in multistage jet flow tubular type fin heat exchange pipe manufacturing process, is characterized in that, comprise the following steps:
(1) making of finned tube: the finned tube making required specification by manufacturing technique requirent;
(2) making of each sub-cascade pipe: at one end of sub-cascade pipe welding bottom, bottom opens centre bore, and the other end is uncovered; Again annular capping is welded on the outer wall of described sub-cascade pipe opening end, and the tube wall of sub-cascade pipe between described bottom and annular capping offers spray orifice;
(3) assembly welding of multistage jet pipe: by pull bar through the centre bore of each sub-cascade pipe bottom, guarantee that each sub-cascade pipe opening end is towards unanimously, then welded step by step by the bottom of pull bar with each sub-cascade pipe, serial connection is integrated, and becomes multistage jet pipe; Stay at regular intervals between adjacent sub-cascade pipe;
(4) assembling of built-in multistage jet flow tubular type fin heat exchange pipe: the inside of multistage jet pipe being inserted finned tube, guarantees that the opening end of each sub-cascade pipe is contrary with the flow direction of cold fluid; The sub-cascade pipe of the first order is placed in cold fluid inlet end, and its annular capping flushes with described finned tube end surfaces and welds, and the annular capping of all the other each sub-cascade pipes is not all welded with finned tube inner surface.
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|---|---|---|---|
| CN201410041427.6A CN104807359B (en) | 2014-01-28 | 2014-01-28 | Built-in multistage jet flow tubular type fin heat exchange pipe and its manufacturing process |
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|---|---|---|---|
| CN201410041427.6A CN104807359B (en) | 2014-01-28 | 2014-01-28 | Built-in multistage jet flow tubular type fin heat exchange pipe and its manufacturing process |
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| CN104807359A true CN104807359A (en) | 2015-07-29 |
| CN104807359B CN104807359B (en) | 2017-12-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299986A (en) * | 2020-03-20 | 2020-06-19 | 中国航发哈尔滨东安发动机有限公司 | Method for processing thin-wall special-shaped piece |
| CN112621142A (en) * | 2020-12-01 | 2021-04-09 | 胡伟 | Heat exchanger fin forming processing method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737948A (en) * | 2008-11-19 | 2010-06-16 | 同济大学 | Jet flow high temperature gas generator |
| CN102818268A (en) * | 2012-07-03 | 2012-12-12 | 中冶南方(武汉)威仕工业炉有限公司 | Triple-stroke air-preheating radiant tube burner heat exchanger |
| CN102853445A (en) * | 2012-07-03 | 2013-01-02 | 中冶南方(武汉)威仕工业炉有限公司 | Double-stroke air preheating radiant tube burner heat exchanger |
| CN102759107A (en) * | 2012-07-31 | 2012-10-31 | 中冶南方(武汉)威仕工业炉有限公司 | Air and coal gas double-preheating secondary injection type radiant tube nozzle heat exchanger and heat exchanging method |
| CN102759109A (en) * | 2012-07-31 | 2012-10-31 | 中冶南方(武汉)威仕工业炉有限公司 | Air-coal gas preheating finned pipe type radiation pipe burner heat exchanger and heat exchange method |
| CN203687731U (en) * | 2014-01-28 | 2014-07-02 | 南京圣诺热管有限公司 | Built-in multilevel jet flow pipe type fin heat exchange pipe |
-
2014
- 2014-01-28 CN CN201410041427.6A patent/CN104807359B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299986A (en) * | 2020-03-20 | 2020-06-19 | 中国航发哈尔滨东安发动机有限公司 | Method for processing thin-wall special-shaped piece |
| CN111299986B (en) * | 2020-03-20 | 2022-05-10 | 中国航发哈尔滨东安发动机有限公司 | Machining method of thin-wall special-shaped piece |
| CN112621142A (en) * | 2020-12-01 | 2021-04-09 | 胡伟 | Heat exchanger fin forming processing method |
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