CN2742364Y - Screw baffle condenser - Google Patents

Abstract

The utility model discloses a screw baffle condenser which can be widely used for film condensation in the field such as petrochemical industry. The condenser utilizes the especial baffling form of the screw baffle plate, the inverse 'V' shape spoiler structure and the optimized screw lead angle to change the flow rate and flow direction of the vapor and reduce the thickness of the liquid film as the heat resistance in the condensation procedure control. The especial arranging mode of the condensation pipe can reduce amount of the pipes in the perpendicular column and prompt the condensate liquid to flow over along the tangential direction of the lower row, so as to restrain the creating speed of the liquid film in the greatest degree, increase the condensation heat transfer coefficient in maximum crest and enlarge the condensation heat transfer rate notably.

Description

The helical baffles condenser

One, technical field

The utility model relates to a kind of condenser, is a kind of helical baffles condenser specifically.

Two, background technology

Condenser is the commonplace gas of petrochemical industry, chemical industry and commercial Application such as metallurgy, electric power, liquid heat-exchange apparatus.Conventional condenser adopts the segmental baffle structure usually, and pressure drop is big and have the zone that remains in a standstill, and energy consumption is big and heat-transfer effect is not good.In addition, when air-flow is restrained with bigger velocity shock, can cause the vibrations of pipe inevitably, cause the fracture of condenser pipe and tube sheet weld.

What condenser was different with other heat exchanger is: whole heat transfer process is accompanied by the condensation of thermal medium steam all the time.When the lower heat exchanger tube tube wall of saturated vapor and temperature contacts, steam will be emitted latent heat, and at the tube wall external cooling liquid that congeals into.The steam condensation is divided into film condensation and dropwise condensation dual mode, and industrial what relate to is film condensation mostly.

After so-called film condensation is the wetting tube wall of condensate liquid, on wall, form the complete liquid film of one deck.Follow-up steam condensation can only be carried out on the surface of liquid film, that is to say the latent heat that the steam condensation is emitted, and must just can pass to cold wall by liquid film.Because the heat transfer coefficient of steam condensation is very big, thermal resistance is very little, and liquid is bigger again because of the little thermal resistance of thermal conductivity factor, so outer this layer liquid film of tube wall just become the control thermal resistance of condensing heat-exchange.Just because of this, the exploitation of all efficient condensers is at present all carried out round the thickness of attenuate liquid film bar none.For example select steam and liquid film co-flow, adopt plain tube, surface coating, pyrolytic coating metal material etc.But said method or not ideal enough, or higher because of complex process, cost because of effect, commercial Application is not general.In order to develop a kind of condenser efficiently, people constantly improve its structure, but effect is not satisfactory all the time.

Three, summary of the invention

The utility model becomes conventional segmental baffle structure and is novel helical baffles structure.Spiral baffle heat exchanger is a kind of very promising novel tubular heat exchanger.Shape is mobile in the shape of a spiral at shell side for fluid, has eliminated the heat transfer stagnant area that traditional segmental baffle board heat exchangers exists, and has reduced pressure drop greatly, has improved heat transfer efficiency.Because steam shape in the shape of a spiral flows, the vibrations that produced when fluid cross is impacted tube bank in the segmental baffle board heat exchangers have in the past been avoided.The utility model is incorporated into conventional shell and tube condenser with this helical baffles structure, and tube bank is by the helical baffles and alternate being formed by connecting of " V " shape spoiler of falling, promptly so-called helical baffles condenser.Steam is spiral between helical baffles to flow forward.Because screw can be regarded as the synthetic of circular motion and axially-movable, in fact the liquid film that forms after the steam condensation is subjected to a kind of motive force in the same way of steam, and gas speed is bigger, and this motive force is just bigger.Under the effect of this motive force, when flowing liquid arrives at the junction of heat exchanger tube and helical baffles on the tube wall, just can descend along deflection plate, thus the effect of playing the reducer film thickness, improving condensation heat transfer speed.

The big I of lead angle is determined according to technological requirement.The lead angle that limits the helical baffles condenser when technological requirement big (being that pitch is bigger), when gas speed is low, the effect of just seeming of above-mentioned axial motive force is very limited." V " form drag stream plate structure of the present utility model can make the part steam along the turbulence forward of " V " v notch v, and liquid film is played a part to add fuel to the flames.When lead angle is spent less than 25, can adopt totally enclosed type triangle spoiler.

In order to reduce the thickness of liquid film on the condenser bundles as much as possible, the arrangement of the utility model condenser pipe adopt the arrangement with routine to rotate a certain angle method that i.e. rotation arranges, to guarantee the slipstream mistake of condensate liquid along next array of pipes, the tangential power of dragging of liquid has shortened the time that liquid stops, the reducer film thickness, reduce the condensation heat transfer thermal resistance, improve condensation heat transfer speed.

Four, description of drawings

Fig. 1 is a helical baffles condenser structure schematic diagram.

Fig. 2 is " V " form drag stream plate structure schematic diagram.

Fig. 3 is the schematic diagram of condenser pipe rotation arrangement with conventional spread.

Five, the specific embodiment

By Fig. 1, Fig. 2 as can be seen, the utility model mainly is made of housing (1), tube sheet (2), condenser pipe (3), helical baffles (4), spoiler (5), distance sink tube parts such as (6).On housing (1), be provided with vapour inlet (7), fixed gas outlet (8), cold fluid inlet (9), cold fluid outlet (10) and condensate outlet (11), discharging hole (12) etc.Helical baffles (4) is formed helical body with spoiler (5) drift angle overlap joint.Helical baffles (4) is fixing by distance sink tube (6), and condenser pipe (3) passes one by one from helical baffles (4), the support that helical baffles (4) and tube sheet (2) are together restrained as condensation.

At first, determine lead angle:, adopt conventional totally enclosed type triangle spoiler here when lead angle when less (finger) less than 25 degree according to the result of technology Calculation; When lead angle (is spent greater than 25) greatly, adopt " V " shape spoiler.The opening degree of " V " shape spoiler is decided on the flow velocity of steam.

By steam in the Kere of horizontal tube condensed exterior computing formula: $\mathrm{\&alpha;}=0.725{\left(\frac{{\mathrm{\&lambda;}}^3{\mathrm{\&rho;}}^2\mathrm{g\&gamma;}}{{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="Y20042008745200061.png"\; state="\{\{state\}\}">n</figure-callout>}}^{\frac{2}{3}}{d}_o\mathrm{\&mu;\&Delta;t}}\right)}^{\frac{1}{4}}$

(n is the pipe number on the vertical row in the formula)

As can be known $\mathrm{\&alpha;}\&Proportional;n^{-\frac{2}{3}}.$ N=5 for example, $n^{-\frac{2}{3}}=0.76,$ That is to say since last 4 row condensate liquids influence, the condensation coefficient of the 5th array of pipes than first tubulation reduced 24%!

Shown in Fig. 3 (a) and (b), (c), (d), conventional condenser pipe is arranged nothing more than two kinds of (a) in upright arrangement and stagger arrangement, and stagger arrangement is divided into two kinds of equilateral triangle stagger arrangement (b) and staggered square pitches (c).Three kinds of arrangements are because the existence of pipe on the vertical row, and to following when respectively arranging, liquid film all can progressive additive from top each current drainage for condensate liquid, below the heat transfer conditions of pipe all to be affected, and more to row's influence down more for serious.In order to improve this situation, reduce the number of pipe on the vertical row, next pipe row of attenuate goes up the thickness of liquid film, and the utility model adopts plants (d) mode that rotates to an angle of arranging with (b).The best angle of rotation should maintain: on arrange the condenser pipe axis vertical plane be the tangent plane of array of pipes down.

Claims (3)

1, a kind of helical baffles condenser that is used for film condensation is characterized in that: tube bank is by the helical baffles and alternate being formed by connecting of " V " shape spoiler of falling, and the big I of its lead angle is determined according to technological requirement.

2, condenser according to claim 1 is characterized in that: when lead angle is spent less than 25, can adopt conventional totally enclosed type triangle spoiler.

3, condenser according to claim 1, its feature also is: condenser pipe has adopted with the existing different rotation arrangement mode of condenser pipe arrangement mode, and this kind arrangement mode can impel the condensate liquid edge slipstream mistake of array of pipes down.

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