CN202485528U - Fin-shaped radial heat exchange tube - Google Patents

Abstract

The utility model discloses a fin-shaped radial heat exchange tube which comprises an inner tube and an outer tube. Water passes through the inside of the inner tube, working media are disposed between the inner tube and the outer tube, and serrated helical fins are wound on the outer wall of the outer tube and continuously distributed along the axial direction. Through the serrated helical fins, convective heat-transfer coefficient can be further improved. The serrated structure of the fins not only has the functions of disturbing airflow and stopping the development of boundary layers, but also can enable the airflow flowing through the fins to generate a local vortex, lead to the transition of flow conditions from layer flow to turbulent flow in advance and enhance heat transmission on the surfaces of the fins. Therefore, overall heat exchange effect of the radial heat exchange tube is greatly enhanced, replacement quantity of the heat exchange tube is reduced, and then the requirement for effective heat exchange of a preheater can be met.

Description

Fin shape is heat exchanger tube radially

Technical field

The utility model relates to heat exchanger tube, more particularly, relates to radially heat exchanger tube of a kind of fin shape.

Background technology

Red Jiao who from coke oven, releases is in 1000 ℃ of red heat states, and its coke quenching method has two kinds of wet method and dry method.Wet quenching is the method that adopts water to extinguish red Jiao.CDQ cools off red Jiao with inert gas exactly, and absorbs most of damp and hot back entering waste heat boiler generation steam among red Jiao.The major advantage of CDQ is environmental protection, can utilize 80% of red heat coke heat, and improves the quality of coke.

The dry coke quenching technological process is seen shown in Figure 1: redly burnt fall into dried putting out in the stove 1 through the furnace roof charging apparatus, and be cooled to 250 ℃ after the inert gas heat exchange of flowing from the bottom to top, be discharged to down then and transport on the burnt belt; Inert gas through blower fan blast dried put out stove 1 cooling coke after; Get into disposable dust remover 2 dedustings through annular flue; Getting into boiler 3 with about 850 ℃ high temperature then drops to below 160 ℃ with the generator tube heat exchange; After secondary filter 4 dedustings, blast dried putting out in the stove 1 by circulating fan 5 and recycle.

For further promoting the production capacity of dry coke quenching; Newly-built dry coke quenching all is provided with pure water preheater 10 (circulating fan 5 and dried putting out between the stove 1) after domestic 2000 in circulating fan 5 exits; Circulating flue gas is carried out reducing temperature twice; Not only coke output can be improved, and the steam consumption of boiler 3 feedwater deaerations can be reduced.Please combine shown in Figure 2ly, this preheater 10 is a console mode, and its housing 11 generally is the cylindrical or cuboid of upper and lower side level turnover inert gas, and up to tens meters, structure is huge, and the radially heat exchanger tube 12 of employing reaches several thousand, and floor space is many.

Please combine Fig. 3, shown in Figure 4; At present common radially heat exchanger tube 12 generally is that inner and outer pipe 121,122 by concentric is socketed to form; In interior pipe 121 inner water flowings, inner and outer pipe 121, be provided with liquid working substance 123 between 122, and also be provided with wick 124 at inner and outer pipe 121, between 122; Wick 124 plays similar effect capillaceous, through promoting and the function of transportation work medium strengthens the heat exchange effect.Radially heat exchanger tube 12 is upwards to realize directly that at it boiling of heat transmission, its condensation process see Fig. 5: promptly constantly absorb heat from the external world through the outer tube 122 of heat exchanger tube radially, after heat got in the pipe, a part was taken away heat through 123 boilings of bottom working medium; A part of in addition vapor absorption that is risen; Saturated vapor becomes superheated steam with the form absorption heat of convection current, and superheated steam is passed to interior pipe 121 in interior pipe 121 wall condensation heat releases with heat; After the cooling water in the interior pipe 121 heat is taken away; Condensed working medium 123 of while is back to the bottom again and evaporates, so repeatedly, realizes that the continuous quilt of heat transmits.

Yet being provided with wick 124 back weld seams increases morely, makes that manufacture difficulty strengthens, cost increases, and wick 124 increased the radially thermal resistance of heat exchanger tube, has influenced heat transfer potential to a certain extent.In addition, the structure of wick 124 can't be regulated wall temperature significantly, and several very little heat pipe internal thermal resistances because this structure has just been connected in pipe line (internal thermal resistance only account for entire thermal resistance 10%～20%) are so it is still limited to regulate the ability of wall temperature.

At present, some former design without preheating device and at the dry coke quenching auxiliary of usefulness, very narrow and small at circulating fan 5 and dried space of putting out between the stove 1, any equipment can't be installed at all.And between circulating fan 5 and secondary filter 4, only the flue gas pipeline of about three meters of the sections of having can utilize.If adopt above-mentioned common console mode dry coke quenching preheater 10, promptly do not have enough handling passage and installation site, and the air resistance of preheater 10 is too big, will produce fatal influence to existing dry coke quenching technology.

Therefore; Transformation for the flue gas reducing temperature twice that has dry coke quenching auxiliary now; Not only need the housing of preheater be designed again,, design again but also need to exchange heat pipe to satisfy the installing space demand; Under the situation that reduces the heat exchanger tube consumption, efficiently and effectively improves its heat transfer efficiency.

The utility model content

To the above-mentioned shortcoming that exists in the prior art, the purpose of the utility model provides radially heat exchanger tube of a kind of fin shape, can effectively improve its heat transfer efficiency.

For realizing above-mentioned purpose, the utility model adopts following technical scheme:

This fin shape radially heat exchanger tube is located in the preheater shell; Comprise inner and outer pipe; Interior pipe inside is connected with water, is provided with working medium between the inner and outer pipe, also is wound with the helical fin of continuous distributed vertically on the described outer tube outer wall; And on the circumference of helical fin, evenly have the spill teeth groove that several distribute vertically, make the radial circumference indentation structure of each fin.

Described fin height is 0.2～0.25 of an outer tube diameter, and spacing of fin is 12～15mm, and fin thickness is 1～1.5mm.

The tooth depth of described fin be wing high 0.5～0.65, the facewidth is 4～6mm.

Described helical fin is connected to a fixed through high-frequency welding and outer tube outer wall.

Described outer tube outer wall and helical fin surface are equipped with corrosion-inhibiting coating.

In technique scheme, the fin shape of the utility model radially heat exchanger tube comprises inner and outer pipe, and interior pipe inside is connected with water, is provided with working medium between the inner and outer pipe, also is wound with the profile of tooth helical fin of continuous distributed vertically on the outer tube outer wall.Through this profile of tooth helical fin, can further improve convective heat-transfer coefficient, not only have the effect of rough air, the development of prevention boundary layer through the zigzag structure on the fin; And can also make its air-flow of flowing through produce local eddy currents; Flow regime is carried out the transition to turbulent flow in advance by laminar flow, make the heat transfer of fin surface be able to strengthen, thereby strengthened the radially whole heat exchange effect of heat exchanger tube greatly; Thereby help reducing under the situation of heat exchanger tube consumption, satisfy effective heat exchange demand of preheater.

Description of drawings

Fig. 1 is the dry coke quenching process principle figure of prior art;

Fig. 2 is the structure chart of the dry coke quenching preheater of prior art;

Fig. 3 is the concentric radially axial cutaway view of heat exchanger tube of prior art;

Fig. 4 is the concentric radially radial cross-section of heat exchanger tube of prior art;

Fig. 5 is the radially heat exchange schematic diagram of radially heat exchanger tube;

Fig. 6 is the radial cross-section of the fin shape heat exchanger tube of the utility model;

Fig. 7 is the axial cutaway view of the fin shape heat exchanger tube of the utility model.

The specific embodiment

Further specify the technical scheme of the utility model below in conjunction with accompanying drawing and embodiment.

See also Fig. 6～shown in Figure 7; The fin shape of the utility model radially heat exchanger tube 22 identical with prior art be, equally also be located in the preheater shell, comprise inner and outer pipe 221,222; In pipe 221 inside be connected with water, inner and outer pipe 221, be provided with working medium 2 23 between 222.Different is; Also be wound with the helical fin 224 of continuous distributed vertically on described outer tube 222 outer walls; And on the circumference of helical fin 224, evenly have the spill teeth groove 225 that several distribute vertically, make the radial circumference indentation structure of each fin 224.Through repeated calculation and test of many times, described fin 224 height h 1 are designed to 0.2～0.25 (d among Fig. 7 is interior pipe 221 diameters) of outer tube 222 diameter D, fin 224 spacing L1 are designed to 12～15mm, and fin 224 Thickness Design are 1～1.5mm.And the tooth depth h2 of described fin 224 is designed to 0.5～0.65 of the high h1 of wing, and facewidth L2 is designed to 4～6mm.So profile of tooth helical fin 224 heat exchanger tubes can further improve convective heat-transfer coefficient, and its heat transfer efficiency is higher than general monolithic devices helical fin, especially far above with the heat exchanger tube 12 of existing common non-finned.This be because; The effect that not only has rough air, the development of prevention boundary layer through fin 224 lip-deep zigzag structures; And can also make its air-flow of flowing through produce local eddy currents, and flow regime is carried out the transition to turbulent flow in advance by laminar flow, make the heat transfers on fin 224 surfaces be able to strengthen.In manufacturing process, can above-mentioned profile of tooth helical fin 224 be connected to a fixed with outer tube 222 outer walls through high-frequency welding.Simultaneously, reasonably fin 224 spacing equidimensions design makes that also tube wall temperature is far longer than dew-point temperature, thereby prevents the generation of heat exchanger tube heating surface dew point corrosion under the nominal situation effectively.In addition, be equipped with corrosion-inhibiting coating at described outer tube 222 outer walls and helical fin 224 surfaces, this corrosion-inhibiting coating can adopt hot dipping alumetizing process to realize.Through this corrosion-inhibiting coating, can further improve its antiseptic property, greatly prolonged its service life.

In sum; Adopt the radially heat exchanger tube 22 of the utility model; It has advantages such as heat-transfer effect is good, easy to process, anticorrosion, wear-resisting, non-oxidizability is good; Compare with existing concentric radially heat exchanger tube 12, it can meet or exceed the former heat-transfer effect in use amount under the former situation; Thereby the coupling that can satisfy volume compact type preheater is fully used and the heat exchange requirement, is particularly suited for the flue gas reducing temperature twice transformation that preheater is installed on circulating fan 5 import department's flues to existing dry coke quenching auxiliary.

Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the utility model; And be not the qualification that is used as the utility model; As long as in the connotation scope of the utility model, all will drop in claims scope of the utility model variation, the modification of the above embodiment.

Claims (5)

1. fin shape heat exchanger tube radially is located in the preheater shell, comprises inner and outer pipe, and interior pipe inside is connected with water, is provided with working medium between the inner and outer pipe, it is characterized in that:

Also be wound with the helical fin of continuous distributed vertically on the described outer tube outer wall, and on the circumference of helical fin, evenly have the spill teeth groove that several distribute vertically, make the radial circumference indentation structure of each fin.

2. fin shape as claimed in claim 1 is heat exchanger tube radially, it is characterized in that:

Described fin height is 0.2～0.25 of an outer tube diameter, and spacing of fin is 12～15mm, and fin thickness is 1～1.5mm.

3. according to claim 1 or claim 2 fin shape heat exchanger tube radially is characterized in that:

The tooth depth of described fin be wing high 0.5～0.65, the facewidth is 4～6mm.

4. fin shape as claimed in claim 1 is heat exchanger tube radially, it is characterized in that:

Described helical fin is connected to a fixed through high-frequency welding and outer tube outer wall.

5. fin shape as claimed in claim 1 is heat exchanger tube radially, it is characterized in that:

Described outer tube outer wall and helical fin surface are equipped with corrosion-inhibiting coating.

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