CN206944796U - Oval fin bielliptic(al) extended surface tube heat exchange element - Google Patents

Abstract

It the utility model is related to a kind of oval fin bielliptic(al) extended surface tube heat exchange element, it includes the base tube of two parallel arrangements, and it is located at some groups of symmetrical fins of two 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 two half elliptics, each half elliptic is outwards to offset equally distance by the outward flange of each base tube to be formed, make it that fin outward flange is outer peripheral apart from equal recently with base tube, the outward flange of the monosymmetric two half elliptic fins of each base tube is on same ellipse, and leave process gap 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

Oval fin bielliptic(al) extended surface tube heat exchange element

Technical field

It the utility model is related to a kind of heat exchange element, more particularly to a kind of oval fin bielliptic(al) extended surface tube heat exchange member 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.

Extended surface currently used for the elliptical heat exchange tube of above-mentioned heat-exchanger rig is H type fins, is by H types circular section Heat exchanger tube is transplanted, as shown in figure 1, wherein base tube 1 is elliptical tube, fin 2 is H types, because its shape is like English alphabet H, And base tube is referred to as H type bielliptic(al) gilled tubes for elliptical tube, the H type Double Circle gilled tubes that base tube is circular section, such as Fig. 2 are different from It is shown.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 carbonated drink Mixture）, or by the heat transfer of medium in base tube 1 to the gas outside base tube 1, in other influence factors all identical feelings Under condition, fin transmits the size of heat ability, that is, heat conduction efficiency and the height of fin（The outermost edge of fin is apart from base The nearest outward flange size of pipe 1）There is close relationship, highly smaller heat-transfer capability is bigger, otherwise smaller.Can be with from Fig. 1 and Fig. 2 Find out, apart from base tube 1, outer peripheral size is all recently for H type fin outward flanges, and wherein summit A is nearest apart from base tube 1 Outer peripheral size is maximum, and the effect that A places transmit heat is worst, that is, at A heating surface utilization rate it is minimum, raising heating surface Utilization rate be the purpose of this utility patent, if the heating surface at A is used for into other places, as in Fig. 1 and Fig. 2 B points it is outer At the C of side, as long as apart from base tube 1, outer peripheral size L1 is less than at A apart from the outer peripheral size L recently of base tube 1 recently at C, change Thermal effect then increases.

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 double ellipse for a kind of oval fin of above-mentioned prior art offer Circle extended surface tube heat exchange element, not only inned coefficient is high for it, and uniform distribution of temperature field, dust stratification are further reduced, whole fin The heat exchange efficiency of pipe 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 oval fin bielliptic(al) pipe heat exchange member Part, it includes the base tube of two parallel arrangements, both sides Welding flat steel of the base tube along airflow direction, and is located at two foundation pipe both sides Some groups of symmetrical fins, the sections of two described foundation pipes is ellipse, and the fin is by two half elliptic structures Into each half elliptic is outwards to offset equally distance by the outward flange of each base tube to be formed, to cause fin outward flange and base Pipe is outer peripheral apart from equal recently, and the outward flange of each monosymmetric two half elliptic fins of base tube is located at same ellipse On, and process gap c is left between every group of symmetrical fin and band steel, the outside wall surface of the fin and oval base tube, which uses, welds Mode connect.

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 apart from base tube, outer peripheral equal sized, the uniform distribution of temperature field of fin, heat exchange are imitated recently Fruit 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 oval fin bielliptic(al) extended surface tube heat exchange element, including two are the utility model is related to The base tube 1 of root parallel arrangement, and be located at some groups of symmetrical fins 2 of every both sides of foundation pipe 1 and be located at base tube 1 along gas The band steel 3 being arranged symmetrically of direction both sides is flowed, the plane of every group of symmetrical fin 2 composition is each perpendicular to the axial line of base tube Direction, the section of two described foundation pipes 1 is ellipse, and the fin 2 is made up of two half elliptics, and each half elliptic is Equally distance is outwards offset by the outward flange of each base tube 1 to be formed, make it that the outward flange of fin 2 is outer peripheral recently with base tube 1 Apart from equal, reach uniform distribution of temperature field, heat transfer effect is optimal, each 1 monosymmetric two half elliptic fin of base tube Outward flange on same ellipse, and process gap is left between every group of symmetrical fin, the fin 2 and oval base tube 1 Outside wall surface using welding by the way of connect, band steel 3 can connect with welding with oval base tube 1, can also custom-made ellipse fin Piece pipe.

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 Marginal dimension is equal, reaches uniform distribution of temperature field, and heat transfer effect is optimal, therefore is to save material compared with H type fins, makes Obtain 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 oval fin bielliptic(al) extended surface tube heat exchange element, it includes the base tube of two parallel arrangements（1）, and be located at Per foundation pipe（1）Some groups of symmetrical fins of both sides（2）Be located at base tube（1）Along being arranged symmetrically for airflow direction both sides Band steel（3）, it is characterised in that：Two described foundation pipes（1）Section for ellipse, each base tube（1）Monosymmetric two The outward flange of individual half elliptic fin is on same ellipse, and every group of symmetrical fin（2）Between leave process gap, it is described Fin（2）It is made up of two half elliptics, each half elliptic is by each base tube（1）Outward flange outwards offset same distance Formed, to cause fin（2）Outward flange and base tube（1）It is outer peripheral apart from equal, the fin recently（2）With oval base tube （1）Outside wall surface using welding by the way of connect.

A kind of 2. oval fin bielliptic(al) extended surface tube heat exchange element 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. oval fin bielliptic(al) extended surface tube heat exchange element 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. oval fin bielliptic(al) extended surface tube heat exchange element 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. oval fin bielliptic(al) extended surface tube heat exchange element 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. oval fin bielliptic(al) extended surface tube heat exchange element 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.