Tubular heat exchanger

FIELD: machine building.

SUBSTANCE: heat exchanger consists of cross flowed profiled pipe bundle in form of three diametrically tied round cylinders where central one has bigger diametre d1 and two other similar cylinders have less diametre d2 and are conjugated with central cylinder in front and back parts by triangular design. Also, the heat exchanger has collectors with tube plates. Owing to the design of tubes of different cylinder profile a flow of heat carrier successively streams arranged downstream cylinder parts (elements) of heat exchanging tubular surface of bigger diametre d1 and coupled cylinder parts of less diametre d2 between them. Also, conjugated back and front parts of less diametre d2 of each pipe of a lengthwise row are arranged symmetrically relative to axis of transverse row of pipes passing through centres of parts of bigger diametre d1. The flow moves sinuously in tube space of the bundle. The above described design of profiled pipes facilitates direct and back rational detached flow.

EFFECT: raised efficiency of pipe surface heat transfer, reduced specific quantity of metal and reduced volume of heat exchanger.

5 dwg

 

The invention relates to heat-exchange technique and can be used to create heat exchangers and devices transport, industrial and energy purposes, the base of which is transversely smooth tubular surface.

A known heat exchanger containing transversely sleek smooth cylindrical beam pipe of the same diameter with rectangular or triangular breakdown, and the reservoir tube boards [1, p.7-8, Risa; s-26, table].

The disadvantage of such a heat exchanger is reduced heat transfer efficiency of the outer surface of the tubes and high intensity. Marked intensity of heat transfer due to the fact that for these layouts pipes of equal diameter is characterized by the presence of inactive recirculation zones between the frontal and stern parts of the outer surface of the pipe with inefficient detachable structure of the flow and insufficient level of turbulence. To the greatest extent these shortcomings manifest themselves in systems with into the servants ' heads (linear) arrangement of pipes.

The closest technical solution, selected as a prototype, is a tubular heat exchanger containing a streamlined cross beam profile tubes in the form of two connected cylindrical tubes of different diameters d1>d2with inani and triangular breakdown, and the reservoir tube boards [2].

The disadvantage of this heat exchanger is a significant reduction of the effect of additional turbulence in the flow to change its direction to the opposite, when the pipe with the specified configuration in the beam with a triangular breakdown are located in relation to the flow of the frontal part of the surface of the large diameter d1and aft tubes of smaller diameter d2be in the wind shadow (shell-and-tube heat exchangers with internal partitions, boiler tube bundles and other).

Objectives of the invention are to increase the efficiency of the heat transfer tube surface, the decrease of metal and reduction of the heat exchanger.

The tasks are solved in a tubular heat exchanger containing a streamlined cross beam profile tubes in the form of three diametrically related round cylinders, a Central large diameter d1and paired with him in the front and aft parts of two others of the same cylinder with a smaller diameter d2with a triangular arrangement, and the reservoir tube boards, characterized in that the arrangement of pipes of different size cylindrical profile provides wrap the coolant flow sequentially disposed downstream cylindrical parts (elements) of heat is oudaya tubular surface of the larger diameter d 1and in between coaxial cylindrical portions of smaller diameter d2while connecting the feed and the frontal part of smaller diameter d2each of the tubes longitudinal rows are arranged symmetrically relative to the axis of the transverse rows of tubes passing through the centers of the parts of the larger diameter d1and in the annular space of the beam is winding course of the stream.

During implementation of the invention can be obtained following a feasibility results:

1. Improving the efficiency of heat transfer surfaces by additional turbulence in the flow cross flow tubes bundles trehserijnogo symmetric profile, driven by the positive impact on the flow of parts of pipes with a smaller diameter, forming rational terms separated flow past the parts of the pipes with a large diameter.

2. Increasing the compactness of the surface and reducing the metal of the heat exchanger when using profile raznochintsy pipes.

Figure 1 shows a diagram of a tubular heat exchanger, a longitudinal section; figure 2 is an element of the surface of the tube bundle and tube boards; figure 3 - axonometric image of the tubular element surface with a triangular (chess) piping arrangement; figure 4 - diagram of the split tubes in tube plates with triangular is the layout section A-A in figure 2; figure 5 is a variant of the split tubes in tube plates with a triangular layout.

When working tubular heat exchanger containing the beam profile of the pipe 1 and the reservoir 2 with the tube boards 3 (figure 1), the heat from the hot coolant flowing inside the pipes through the walls is transferred to the cold fluid transversely washing the outside surface of the pipe. The efficiency of heat transfer process in the beam depends greatly on the intensity of heat transfer between the outer surface and washing with brine.

When a triangular layout profile tubes (Fig.1-5) front cylindrical part with a smaller diameter d2at the same time play the role of additional turbulizer flow and intensify the heat transfer surface subsequent Central part of the pipe with a large diameter d1. This coupled feed and front cylindrical part of the pipe of smaller diameter d2enough are streamed by a stream of fluid directed action vector which is formed in the wall sections between the parts of the pipes with a large diameter d1. Under these conditions, the flow in the annular gap takes a complex tortuous form, significantly activating otryvnye the mechanism of interaction of the stream with a heat exchange surface with additional eg the turbulence.

In the layout of the pipes trehserijnogo profile implements the forward and reverse rational detachable cross-flow and increasing the efficiency of the heat transfer tube surface from the outside.

Sources of information

1. Bajan P.I. and other Reference heat-exchange apparatus / Phibian, Geeneus, Wemmerlov. - M.: Mashinostroenie, 1989. - 368 S.

2. Pat. EN 2350873 C2. Tubular heat exchanger / Any // BI. - 2009. No. 9.

Tubular heat exchanger containing cross-streamlined the beam profile tubes in the form of three diametrically related round cylinders, the Central large diameter d1and paired with him in the front and aft parts of two others of the same cylinder with a smaller diameter d2with a triangular arrangement, and the reservoir tube boards, characterized in that the arrangement of pipes of different size cylindrical profile provides wrap the coolant flow sequentially disposed downstream cylindrical parts (elements) tubular heat the surface of the larger diameter d1and in between coaxial cylindrical portions of smaller diameter d2while connecting the feed and the frontal part of smaller diameter d2each of the tubes longitudinal series are si is metecno about an axis transverse row of pipes, passing through the centers of the parts of the larger diameter d1and in the annular space of the beam is winding course of the stream.



 

Same patents:

FIELD: machine building.

SUBSTANCE: tubular heat exchanger consists of crosswise streamed bundle of profiled pipes in form of two similar conjugated pipes of opposite directed conic profile with different external end diametres, bigger and smaller, and of collectors with pipe plates. At linear (corridor) scheme front and back parts with circular elements of different diametres of their profiled pipes are correspondingly alternated in lengthwise and crosswise rows of the bundle on its each half; at triangle (checkerboard) scheme pipes in the bundle are arranged opposite to a stream, when their front part changes diametre from bigger to smaller or from smaller to bigger diametre along length. In each version of the scheme tube space of the bundle corresponds to lengthwise convergent-divergent channels of alternate cross section of complex geometry.

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6 cl, 6 dwg

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2 dwg

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FIELD: machine building.

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Adapter // 2410621

FIELD: heating.

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1 dwg

Adapter // 2410620

FIELD: heating.

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2 dwg

FIELD: oil and gas industry.

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5 dwg

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FIELD: heat-exchange apparatus.

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3 dwg

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3 cl, 3 dwg

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1 dwg

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1 dwg

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EFFECT: improved heat exchange and enhanced heat power and reliability.

1 dwg

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