CN107167015A

CN107167015A - Polygon fin list ellipse extended surface tube heat exchange element

Info

Publication number: CN107167015A
Application number: CN201710408202.3A
Authority: CN
Inventors: 陈金龙; 刘晓燕; 范云磊; 崔亮
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-06-02
Filing date: 2017-06-02
Publication date: 2017-09-15

Abstract

The present invention relates to a kind of oval extended surface tube heat exchange element of polygon fin list, it includes the base tube of single arrangement, and be located at some groups of symmetrical fins of base tube both sides and be located at the band steel that is arranged symmetrically of the base tube along airflow direction both sides, the section of the base tube is ellipse, the fin is polygon, and each summit of fin is located on same ellipse, the ellipse is outwards to offset certain distance by the outward flange of base tube to be formed, 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 by the present invention, 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

Polygon fin list ellipse extended surface tube heat exchange element

Technical field

The present invention relates to a kind of heat exchange element, more particularly to a kind of oval extended surface tube heat exchange element of polygon fin list.Relate to And 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 Wider, degree is increasingly severe, and people are most deep to the susceptibility of atmosphere pollution, because related to people's " suction ".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, national environmental protection portion and National Energy Board 2014 are according to State Council 《Energy development Strategic Action Plan（2014-2020）》Combine and issue《Coal electricity energy-saving and emission-reduction upgrading 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 that, 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, Reach the purpose of reduction 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, is also progressively 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 the oval gilled tube of H types for elliptical tube, the H type gilled tubes that base tube is circular section are different from, as shown in Figure 2.Rib The heat-transfer mechanism of piece is by flue gas（Gas）Heat WATER AS FLOW MEDIUM in base tube 1 is delivered to by heat transfer（Or steam-water mixing Thing）, or by the heat transfer of medium in base tube 1 to the gas outside base tube 1, in other influence factors all identical situations Under, 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 tube 1 nearest outward flange size）There is close relationship, highly smaller heat-transfer capability is bigger, on the contrary it is smaller.Can from Fig. 1 and Fig. 2 Go out, apart from base tube 1, outer peripheral size is all recently for H type fin outward flanges, and wherein summit A is outer recently apart from base tube 1 The size at edge is maximum, and the effect of A places transmission heat is worst, that is, at A heating surface utilization rate it is minimum, raising heating surface Utilization rate is the purpose of patent of the present invention, if the heating surface at A be used in other places, such as Fig. 1 and Fig. 2 at the outside C of B points, As long as apart from base tube 1, outer peripheral size L1 is less than at A apart from the nearest outer peripheral size L of base tube 1, heat transfer effect recently at C Then increase.

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 there is vortex, 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 reach the effect for improving heat transfer effect.

The content of the invention

The technical problems to be solved by the invention are to provide a kind of polygon fin list oval fin for above-mentioned prior art Piece pipe heat exchange element, its not only inned coefficient height, and uniform distribution of temperature field, dust stratification is further reduced, whole gilled tube Heat exchange efficiency is high, and metal consumption is low in the case of identical heat output.

The present invention the used technical scheme that solves the above problems is：A kind of polygon fin list ellipse pipe heat exchange element, It includes the base tube of single arrangement, both sides Welding flat steel of the base tube along airflow direction, and is located at some groups of phases of base tube both sides Mutual symmetrical fin, the section of the base tube is ellipse, and the fin is polygon, and fin each summit be located at it is same On ellipse, the ellipse is outwards to offset certain distance by the outward flange of base tube to be formed, and is stayed between every group of symmetrical fin and band steel There is process gap c, 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 6-50mm according to the size of pipe and the characteristic of air-flow, B is 3-12mm.

Preferably, the band steel is welded to connect or the oval extended surface tube of custom-made with oval base tube.

Compared with prior art, the advantage of the invention is that：

The present invention compares with circular base tube as a result of oval base tube and reduces air-flow by the resistance caused by base tube surface Loss, so that energy consumption is reduced, and base tube has welded band steel along the both sides of airflow direction, destroys the vortex of air-flow, reduces Containing grey air-flow at the back side of the dust stratification, especially airflow scouring of tube surface, so as to further increase heat transfer effect, simultaneously Because fin outward flange outer peripheral is closely sized to equal, the uniform distribution of temperature field of fin, heat transfer effect recently apart from base tube Preferably, metal consumption is low in the case of the utilization rate highest of fin, identical heat output.

Brief description of the drawings

Fig. 1 is the structural representation of existing H types list elliptical heat exchange tube.

Fig. 2 is the structural representation of the circular heat exchanger tube of existing H types list.

Fig. 3 is front view of the invention.

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 present invention is described in further detail below in conjunction with accompanying drawing embodiment.

As shown in Fig. 3-5, the present invention relates to a kind of oval extended surface tube heat exchange element of polygon fin list, it includes single The base tube 1 of arrangement, and be located at some groups of symmetrical fins 2 of the both sides of base tube 1 and be located at base tube 1 along airflow direction both sides The band steel 3 being arranged symmetrically, the section of the base tube 1 is ellipse, and the fin 2 is polygon, and each summit of fin 2 On same ellipse, the ellipse is outwards to offset certain distance by the outward flange of base tube 1 to be formed, so as to obtain every on polygon Individual point reaches uniform distribution of temperature field to the outer peripheral minimum distance of base tube 1 close to equal, and heat transfer effect is optimal, and every group symmetrical Fin 2 between leave process gap, the outside wall surface of the fin 2 and oval base tube 1 by the way of welding using being connected, band steel 3 It can be connected with welding with oval base tube 1, can also the oval extended surface tube of custom-made.

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 that are 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 that energy consumption is reduced, and base tube Band steel has been welded along the both sides of airflow direction, the vortex of air-flow is destroyed, the dust stratification in tube surface containing grey air-flow is reduced, The especially back side of airflow scouring, so that heat transfer effect is further increased, 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 preferable implementation of the present invention is the foregoing is only, is not intended to limit the invention, it is all in this hair Non-essential modification, replacement, improvement for being made in bright spirit etc., should be included in the scope of the protection.

Claims

1. a kind of oval extended surface tube heat exchange element of polygon fin list, it includes the base tube of single arrangement（1）, and it is located at base tube （1）Some groups of symmetrical fins of both sides（2）Be located at base tube（1）Along the band steel being arranged symmetrically of airflow direction both sides （3）, every group of fin symmetrically（2）The plane of composition is each perpendicular to the direction of axis line of base tube, it is characterised in that：The base Pipe（1）Section for ellipse, the fin（2）For polygon, and fin（2）Each summit be located at it is same ellipse on, should Ellipse is by base tube（1）Outward flange outwards offset certain distance and formed, every group of symmetrical fin（2）Between leave technology room Gap, the fin（2）With oval base tube（1）Outside wall surface using welding by the way of connect.

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

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

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

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

6. according to a kind of oval extended surface tube heat exchange element of polygon fin list of claim 1, it is characterised in that：The band steel（3） With oval base tube（1）It is welded to connect or the oval extended surface tube of custom-made.