CN206944798U - The how oval extended surface tube heat exchange element of polygon fin - Google Patents

Abstract

It the utility model is related to a kind of how oval extended surface tube heat exchange element of polygon fin, it includes the base tube of at least three parallel arrangements, and it is located at some groups of symmetrical fins of every foundation pipe both sides and is located at the band steel that is arranged symmetrically of the base tube along airflow direction both sides, the section of two described foundation pipes is ellipse, the fin is made up of multiple identical polygons, and the quantity of polygon is equal with base tube quantity, and the summit of monosymmetric two polygons of each base tube is on same ellipse, the ellipse is outwards to offset certain distance by the outward flange of each base tube to be formed, process gap is left between every group of symmetrical fin, the fin is connected with the outside wall surface of oval base tube by the way of welding.Not only inned coefficient is high for the utility model, and uniform distribution of temperature field, and dust stratification is few, and the heat exchange efficiency of whole gilled tube is high, and opposing metallic consumption is low.

Description

The how oval extended surface tube heat exchange element of polygon fin

Technical field

It the utility model is related to a kind of heat exchange element, more particularly to a kind of how oval extended surface tube heat exchange member of polygon fin Part.It is related to electric power, environmental protection, the energy, chemical industry, building materials, metallurgy and other industry and people's livelihood technical field of heat exchange equipment.

Background technology

With the high speed development of Chinese national economy, environmental pollution is inevitably caused（Atmosphere pollution, water pollution and Land pollution）, in recent years, environmental pollution becomes increasingly conspicuous, particularly atmosphere pollution, and haze weather is more and more, scope is more next It is wider, degree is increasingly severe, people are most deep to the susceptibility of atmosphere pollution, because related to people's " inhale inhale ".Atmosphere pollution Crack cause it is a lot, such as airborne dust, vehicle exhaust, industrial discharge, wherein industrial discharge increasingly attract attention, particularly fired The exhaust emissions of coal equipment, in power industry, National Development and Reform Committee, State Ministry of Environmental Protection and National Energy Board 2014 are according to State Council 《Energy development strategy action plan（2014-2020）》Combine and issue《The energy-saving and emission-reduction of coal electricity upgrade and transformation action plan （2014-2020）》, this action plan specify that target and the timing node requirement of energy-saving and emission-reduction.For this action plan, respectively Utilities Electric Co. and coal-burning power plant have accordingly formulated specific energy-saving and emission-reduction modification scheme and implemented, the measures of energy-saving and emission-reduction it One is exactly by the reduction of the exhaust gas temperature of boiler of power plant unit, so in modification scheme, will generally increase changing for flue gas and water newly Thermal, some power plant also transform original heat-exchanger rig simultaneously, by heat-exchanger rig by the heat transfer of flue gas to WATER AS FLOW MEDIUM, Reaching reduces the purpose of exhaust gas temperature.This heat-exchanger rig is commonly referred to as economizer or flue gas in power plant（Water）Heat exchanger or flue gas Cooler just claims heat exchanger.Most important element is exactly heat exchanger tube in heat-exchanger rig, the heat exchanger tube with extended surface Because comprehensive economic performance is high and saves space, it is widely used, the ellipse heat exchange especially with extended surface Pipe, because dust stratification and abrasion are relatively light, also progressively it is applied in some projects.

More gilled tubes（Number of tubes is more than or equal to 3）Heat exchange element does not have also in the market.Currently used for above-mentioned heat exchange The extended surface of the elliptical heat exchange tube of device is H type fins, such as H type list elliptic heat exchange tubes and H type bielliptic(al) heat exchanger tubes, is Transplanted by H types circular section heat exchanger tube, as shown in Figure 1 is H type bielliptic(al) heat exchanger tubes, and wherein base tube 1 is elliptical tube, fin 2 It is H types, because its shape is like English alphabet H, and base tube is referred to as H type ellipse gilled tubes for elliptical tube, is different from base tube as circle The H type gilled tubes in section, it is illustrated in figure 2 H type Double Circle heat exchanger tubes.The heat-transfer mechanism of fin is by flue gas（Gas）Heat WATER AS FLOW MEDIUM in base tube 1 is delivered to by heat transfer（Or steam water interface）, or the heat transfer of medium in base tube 1 given Gas outside base tube 1, in the case of other influence factors all identicals, fin transmits the size of heat ability, that is, hot biography Lead efficiency and the height of fin（Nearest outward flange size of the outermost edge of fin apart from base tube 1）There is close relationship, height Smaller heat-transfer capability is bigger, otherwise smaller.H type fin outward flanges are can be seen that apart from 1 nearest outward flange of base tube from Fig. 1 and Fig. 2 Size be all that outer peripheral size is maximum recently apart from base tube 1 by wherein summit A, and the effect of A places transmission heat is most The utilization rate of heating surface is minimum at difference, that is, A, and the utilization rate for improving heating surface is the purpose of this utility patent, if Heating surface at A is used for other places, as in Fig. 1 and Fig. 2 at the outside C of B points, as long as apart from the outer peripheral chi recently of base tube 1 at C Very little L1 is less than apart from base tube 1, outer peripheral size L, heat transfer effect then increase recently at A.

Further to reduce dust stratification, the heat exchange efficiency of heat exchanger tube is improved, in both sides Welding flat steel of the base tube along airflow direction, Such as Fig. 3 and Fig. 4.From hydrodynamics, fluid transversal flow pipe（Pipe or elliptical tube）When, pipe is in flow of fluid side To front and rear sides vortex be present, containing ash air-flow will in vortex dust stratification, once heating surface pipe dust stratification will drop significantly Low heat transfer effect, band steel will destroy vortex, reduce dust stratification, especially lee face, so as to have the function that to improve heat transfer effect.

Utility model content

Technical problem to be solved in the utility model is how ellipse for a kind of polygon fin of above-mentioned prior art offer Circle extended surface tube heat exchange element（Elliptical tube quantity is more than or equal to 3）, not only inned coefficient is high for it, and uniform distribution of temperature field, product Grey further to reduce, the heat exchange efficiency of whole gilled tube is high, and metal consumption is low in the case of identical heat output.

The technical scheme in the invention for solving the above technical problem is：A kind of more elliptical tube heat exchange members of polygon fin Part, it includes the base tube of at least three parallel arrangements, both sides Welding flat steel of the base tube along airflow direction, and is located at every foundation pipe Some groups of symmetrical fins of both sides, the section of two described foundation pipes is ellipse, and the fin is by multiple identicals Polygon is formed, and the quantity of polygon is equal with base tube quantity, and the summit of monosymmetric two polygons of each base tube On same ellipse, the ellipse is outwards to offset certain distance by the outward flange of each base tube to be formed, every group of symmetrical fin Process gap c is left between band steel, the fin is connected with the outside wall surface of oval base tube by the way of welding.

Preferably, every group of fin is arranged symmetrically with the long axis direction of oval base tube.

The fin spacing for the adjacent sets being preferably located on oval base tube is arranged as required to, usually 5-50mm.

Preferably, the process gap c between every group of symmetrical fin and band steel is adjusted according to base tube size, usually 2- 20mm。

Preferably, the width a and thickness b of band steel determine that usual a is 6- according to the size of pipe and the characteristic of air-flow 50mm, b 3-12mm.

Preferably, the band steel and oval base tube are welded to connect or custom-made ellipse extended surface tube.

Compared with prior art, the utility model has the advantage of：

The utility model is made compared to reducing air-flow as a result of oval base tube, with circular base tube by base tube surface Into drag losses, so as to reduce energy consumption, and base tube has welded band steel along the both sides of airflow direction, destroys the vortex of air-flow Area, reduce containing grey air-flow at the back side of the dust stratification, especially airflow scouring of tube surface, so as to further increase heat exchange effect Fruit, simultaneously as fin outward flange is closely sized to equal apart from base tube is outer peripheral recently, the uniform distribution of temperature field of fin, change Thermal effect is best, the utilization rate highest of fin, and metal consumption is low in the case of identical heat output.

Brief description of the drawings

Fig. 1 is the structural representation of existing H types bielliptic(al) shape heat exchanger tube.

Fig. 2 is the structural representation of existing H types Double Circle heat exchanger tube.

Fig. 3 is front view of the present utility model.

Fig. 4 is Fig. 3 top view.

Fig. 5 is Fig. 3 side view.

Wherein：

Base tube 1, fin 2, band steel 3.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing embodiment.

As shown in Fig. 3-5, a kind of how oval extended surface tube heat exchange element of polygon fin the utility model is related to（Elliptical tube Quantity is more than or equal to 3）, include the base tubes 1 of at least three parallel arrangements, and be located at some groups of every both sides of foundation pipe 1 it is mutual Symmetrical fin 2 and the band steel 3 that is arranged symmetrically of the base tube 1 along airflow direction both sides is located at, every group of symmetrical fin 2 forms Plane be each perpendicular to the direction of axis line of base tube, the section of the base tube 1 is ellipse, and the fin 2 is by multiple identical Polygon form, and the quantity of polygon is equal with base tube quantity, and each top of monosymmetric two polygons of base tube For point on same ellipse, the ellipse is outwards to offset certain distance by the outward flange of each base tube 1 to be formed, so as to obtain polygon Upper each point reaches uniform distribution of temperature field, heat transfer effect is optimal, and every group symmetrical to 1 outer peripheral distance of base tube close to equal Fin 2 between leave process gap, the fin 2 is connected with the outside wall surface of oval base tube 1 by the way of welding, band steel 3 It can be connected with welding with oval base tube 1, can also custom-made ellipse extended surface tube.

In the present embodiment, every group of fin is arranged symmetrically with the long axis direction of oval base tube, on oval base tube The fin spacing of adjacent sets is 5-50mm, and the process gap between every group of fin 2 and band steel 3 being arranged symmetrically is 2-20mm, by In employing oval base tube, air-flow is reduced by the drag losses caused by base tube surface, so as to reduce energy consumption, and base tube Band steel has been welded along the both sides of airflow direction, has destroyed the vortex of air-flow, has reduced the dust stratification in tube surface containing grey air-flow, The especially back side of airflow scouring, so as to further increase heat transfer effect, while the outward flange of fin 2 is outer recently apart from base tube 1 Being closely sized to for edge is equal, reaches uniform distribution of temperature field, and heat transfer effect is optimal, therefore is to save material compared with H type fins Material so that the weight reduction of whole heat exchange element and heat-exchanger rig.

A kind of preferably implementation of the present utility model is the foregoing is only, not to limit the utility model, All non-essential modifications made in the utility model spirit, replacement, improvement etc., should be included in of the present utility model Within protection domain.

Claims (6)

1. a kind of how oval extended surface tube heat exchange element of polygon fin, it includes the base tube of at least three parallel arrangements（1）, and It is located at base tube（1）Some groups of symmetrical fins of both sides（2）Be located at being arranged symmetrically along airflow direction both sides of base tube 1 Band steel 3, it is characterised in that：The base tube（1）Section be ellipse, the fin（2）By multiple identical polygon structures Into, and the quantity of polygon is equal with base tube quantity, and the summit of monosymmetric two polygons of each base tube is positioned at same On ellipse, the ellipse is by each base tube（1）Outward flange outwards offset certain distance and formed, every group of symmetrical fin（2）Between Leave process gap, the fin（2）With oval base tube（1）Outside wall surface using welding by the way of connect.

A kind of 2. how oval extended surface tube heat exchange element of polygon fin according to claim 1, it is characterised in that：Every group of rib Piece（2）It is with oval base tube（1）Long axis direction be arranged symmetrically.

A kind of 3. how oval extended surface tube heat exchange element of polygon fin according to claim 1, it is characterised in that：Positioned at ellipse Physa pipe（1）On adjacent sets fin（2）Spacing is arranged as required to, usually 5-50mm.

A kind of 4. how oval extended surface tube heat exchange element of polygon fin according to claim 1, it is characterised in that：Every group pair The fin of title（2）With band steel（3）Between process gap according to base tube（1）Size is adjusted, usually 2-20mm.

A kind of 5. how oval extended surface tube heat exchange element of polygon fin according to claim 1, it is characterised in that：Symmetrically Band steel（3）Width a and thickness b determine that usual a is 6-50mm, b 3- according to the size of pipe and the characteristic of air-flow 12mm。

A kind of 6. how oval extended surface tube heat exchange element of polygon fin according to claim 1, it is characterised in that：It is described Band steel（3）With oval base tube（1）It is welded to connect or custom-made ellipse extended surface tube.