A co-current double-corrugated finned tube heat exchanger and a heat exchange method

Abstract

The application discloses a same-direction double-corrugated finned tube heat exchanger and a heat exchange method. The heat exchanger comprises a gas inlet pipe, a heat exchanger core group and a gas outlet pipe which are connected in sequence. The heat exchanger core group comprises a heat exchange base pipe, double-corrugated fins and a heat exchange shell. The double-corrugated fins are sleeved on the heat exchange base pipe and fixed in the heat exchange shell through the base pipe. The double-corrugated fins comprise transverse corrugations and longitudinal corrugations. The same-direction double-corrugated finned tube is used by the same shape of the transverse corrugations and the longitudinal corrugations. The corrugation structure increases the heat exchange area. The condensate film is thinned at the wave crests of the longitudinal corrugations and thickened at the wave troughs. The periodic corrugation structure can reduce the film thickness, reduce the condensation thermal resistance, the wave crests of the transverse corrugations can reduce the spreadability of the film in the gas velocity direction and block the liquid drops carried by the gas, strengthen the condensation of the liquid drops and improve the dehumidification and heat exchange effects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to a same-direction double-corrugated finned tube heat exchanger and a heat exchange method. BACKGROUND

[0002] The finned heat sink is the most widely used heat exchanger in gas-liquid heat exchangers, and the existing fins are straight fins. Although the straight fins can increase the heat exchange area, when applied to a gas containing moisture, the condensate film has a slow descending speed, and the liquid film has a large thermal resistance. In the vertical direction, the liquid film thickness increases with the flow length, the liquid film thermal resistance increases, and the heat exchange effect decreases. The gas flow direction is perpendicular to the liquid film flow direction, and the flat fin can make the liquid film spread in the horizontal direction, further reducing the liquid film descending speed and affecting the heat exchange effect. SUMMARY

[0003] Technical purpose: in view of the fact that the existing heat exchanger adopts straight fins, when heat exchange is performed on a gas containing moisture, the liquid film has a slow descending speed, the liquid film thermal resistance increases, and the heat exchange effect is affected, the present application discloses a same-direction double-corrugated finned tube heat exchanger and a heat exchange method which can block the spread of the liquid film, strengthen dropwise condensation, and improve the condensation efficiency.

[0004] Technical scheme: in order to achieve the above technical purpose, the present application adopts the following technical scheme:

[0005] A same-direction double-corrugated finned tube heat exchanger, comprising a gas inlet pipe, a heat exchanger core group and a gas outlet pipe connected in sequence; the heat exchanger core group comprises a heat exchange base pipe, double-corrugated fins and a heat exchange shell, the double-corrugated fins are sleeved on the heat exchange base pipe and fixed in the heat exchange shell through the base pipe, the double-corrugated fins comprise horizontal corrugations and vertical corrugations, and the horizontal corrugations and the vertical corrugations have the same shape.

[0006] Preferably, the cross-sectional curve of the horizontal corrugation and the vertical corrugation of the present application is a sinusoidal curve, and the sinusoidal function of the curve is: wherein m represents the pitch of the double-corrugated fins, and L represents the height of the fins.

[0007] Preferably, the pitch m of the double-corrugated fins of the present application is 1.5d, wherein d represents the diameter of the heat exchange base pipe, and L < 2mm.

[0008] Preferably, the heat exchange base pipe of the present application is arranged at the wave trough of the horizontal corrugation and arranged in a regular quadrilateral on the double-corrugated fins.

[0009] Preferably, the heat exchange base pipe of the present application adopts a copper pipe, the double-corrugated fins and the heat exchange base pipe are connected in a sleeve piece or string piece mode, a base for fixing the pitch between the fins is arranged between adjacent double-corrugated fins, and the base is sleeved on the heat exchange base pipe.

[0010] Preferably, the present invention provides a liquid collector and a condensate drain pipe connected to the liquid collector at the lower part of the heat exchange shell. The liquid condensed in the heat exchanger is collected in the liquid collector and discharged through the condensate drain pipe.

[0011] The present invention also provides a heat exchange method based on the above-mentioned heat exchanger, comprising the following steps:

[0012] S01. Cooling water is introduced into the base tube. Gas enters the space between the double corrugated fins of the heat exchanger through the inlet. Water vapor in the gas condenses upon heating. Some of the condensate falls along the longitudinal corrugations after condensation. At the trough of the transverse corrugations, the spread of the liquid film in the direction of gas velocity is slowed down. Some of the droplets carried by the gas are blocked by the peaks of the transverse corrugations and condense in contact with the fins.

[0013] S02. The condensate collects in the liquid collector and is discharged through the condensate drain pipe.

[0014] Preferably, in step S01 of the present invention, the droplets blocked by the crests of the transverse corrugations flow from the crests to the troughs of the transverse corrugations, agglomerate, and form condensed droplets, thereby enhancing heat transfer with the base tube at the troughs of the transverse corrugations.

[0015] Beneficial effects: The co-directional double-corrugated finned tube heat exchanger and heat exchange method provided by the present invention have the following beneficial effects:

[0016] 1. This invention uses double-corrugated finned tubes arranged in the same direction. The corrugated structure increases the heat exchange area. The condensate film becomes thinner at the crest of the longitudinal corrugations and thickens at the troughs. The periodic corrugated structure can reduce the thickness of the liquid film, reduce the condensation thermal resistance, and improve the heat exchange effect.

[0017] 2. The crests of the transverse corrugations of the present invention can block droplets carried by gas, enhance droplet condensation, and improve dehumidification effect.

[0018] 3. In the heat exchange base tube of the present invention, at the trough of the transverse corrugations, the droplets inside the transverse corrugations tend to flow from the crest to the trough of the transverse corrugations, agglomerate, and enhance heat transfer. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0020] Figure 1 This is an overall structural diagram of the heat exchanger of the present invention;

[0021] Figure 2 This is a structural diagram of the double-corrugated fin heat exchanger of the present invention;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the double corrugated fins of the present invention;

[0023] Figure 4 This is a cross-sectional view along the axial direction of the heat exchange base tube;

[0024] Among them, 1-inlet pipe, 2-heat exchanger core assembly, 3-outlet pipe, 4-heat exchange base tube, 5-double corrugated fins, 6-heat exchange shell, 7-base, 8-condensate drain pipe. Detailed Implementation

[0025] The present invention will now be described more clearly and completely by way of a preferred embodiment in conjunction with the accompanying drawings, but this does not limit the invention to the scope of the described embodiment.

[0026] like Figures 1-4 The diagram shows a co-directional double-corrugated finned tube heat exchanger disclosed in this invention, comprising an inlet pipe 1, a heat exchanger core assembly 2, and an outlet pipe 3 connected in sequence. The heat exchanger core assembly 2 includes a heat exchange base tube 4, double-corrugated fins 5, and a heat exchange shell 6. The double-corrugated fins 5 are sleeved on the heat exchange base tube 4 and fixed inside the heat exchange shell 6 by the base tube 4. The double-corrugated fins 5 include transverse corrugations and longitudinal corrugations, and the transverse corrugations and longitudinal corrugations have the same shape. A liquid collector and a condensate drain pipe 8 communicating with the liquid collector are provided at the lower part of the heat exchange shell 6. The liquid condensed inside the heat exchanger is collected in the liquid collector and discharged through the condensate drain pipe 8.

[0027] Specifically, the cross-sectional curves of the transverse and longitudinal corrugations of this invention are sine curves, and the sine function of the curves is: Where m represents the spacing of the double corrugated fins, L represents the height of the fins, the spacing of the double corrugated fins 5 m=1.5d, where d represents the diameter of the heat exchange base tube 4, and L<2mm.

[0028] To reduce the resistance loss caused by the corrugated structure, the heat exchange base tube 4 of the present invention is set at the trough of the transverse corrugation and arranged in a regular quadrilateral on the double corrugated fins 5. The heat exchange base tube 4 is made of copper tube. The double corrugated fins 5 are connected to the heat exchange base tube 4 by means of sleeve or string. A base 7 for fixing the fin spacing is provided between adjacent double corrugated fins 5. The base 7 is sleeved on the heat exchange base tube 4.

[0029] The present invention also provides a heat exchanger method using the above-mentioned co-directional double-corrugated finned tube heat exchanger, comprising the following steps:

[0030] S01. Cooling water is introduced into the base tube. Gas enters the space between the double corrugated fins of the heat exchanger through the inlet. Water vapor in the gas condenses upon heating. Some of the condensate falls along the longitudinal corrugations after condensation. At the trough of the transverse corrugations, the spread of the liquid film in the direction of gas velocity is slowed down. Some of the droplets carried by the gas are blocked by the peaks of the transverse corrugations and condense in contact with the fins.

[0031] S02. The condensate collects in the liquid collector and is discharged through the condensate drain pipe.

[0032] In step S01, the droplets blocked by the crests of the transverse corrugations flow from the crests to the troughs of the transverse corrugations, agglomerate, and form condensed droplets, which enhance heat transfer with the base tube at the troughs of the transverse corrugations.

[0033] In use, humid gas enters the heat exchanger core assembly 2 through the inlet pipe 1. Cooling water is injected into the heat exchange base tube 4 through the water inlet on the heat exchange shell. Heat exchange occurs between the humid gas and the heat exchange base tube 4, causing water vapor in the gas to condense. The condensate film slides down along the longitudinal corrugations. The thickness of the liquid film is thinner at the crests and thicker at the troughs of the longitudinal corrugations. The periodic corrugated structure reduces the thickness of the liquid film. The spread of the liquid film along the gas flow direction is blocked by the transverse corrugations, and the transverse corrugations... Condensate droplets form from the troughs to the crests, enhancing droplet condensation, reducing condensation thermal resistance, and improving heat exchange efficiency. Droplets carried by the gas are blocked by the crests of the transverse corrugations, increasing dehumidification rate. Cooling water after heat exchange is discharged from the outlet pipe on the heat exchange shell. Increasing the number of tube passes can increase the water flow rate, enhancing heat exchange and improving the flushing speed of dirt inside the water pipes, preventing blockage caused by excessively low water flow rate. Condensate condensed in the gas is collected in the collector and discharged uniformly from the condensate drain pipe.

[0034] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A heat exchanger heat exchange method, characterized in that, The heat exchanger includes an inlet pipe (1), a heat exchanger core assembly (2), and an outlet pipe (3) connected in sequence; the heat exchanger core assembly (2) includes a heat exchange base tube (4), double corrugated fins (5), and a heat exchange shell (6). The double corrugated fins (5) are sleeved on the heat exchange base tube (4) and fixed inside the heat exchange shell (6) by the base tube (4). The double corrugated fins (5) include transverse corrugations and longitudinal corrugations, and the transverse corrugations and longitudinal corrugations have the same shape. The cross-sectional curves of the transverse and longitudinal corrugations are sinusoidal curves, and the sine function of the curves is: ; Where m represents the spacing between the double corrugated fins, and L represents the height of the fins; The heat exchange base tube (4) is located at the trough of the transverse corrugation and is arranged in a square on the double corrugated fins (5). A liquid collector and a condensate drain pipe (8) connected to the liquid collector are provided at the lower part of the heat exchange shell (6). The liquid condensed in the heat exchanger is collected in the liquid collector and discharged through the condensate drain pipe (8). The heat exchange method includes the following steps: S01. Cooling water is introduced into the base tube. Gas enters the space between the double corrugated fins of the heat exchanger through the air inlet. Water vapor in the gas condenses when heated. Some of the condensate falls along the longitudinal corrugations after condensation. At the trough of the transverse corrugations, the spread of the liquid film in the direction of gas velocity is slowed down. Some of the droplets carried by the gas are blocked by the peaks of the transverse corrugations and come into contact with the fins to condense. S02. The condensate collects in the liquid collector and is discharged through the condensate drain pipe.

2. The heat exchanger heat exchange method according to claim 1, characterized in that, The spacing between the double corrugated fins (5) is m=1.5d, where d represents the diameter of the heat exchange base tube (4), and L<2mm.

3. The heat exchanger heat exchange method according to claim 1, characterized in that, The heat exchange base tube (4) is made of copper tube. The double corrugated fins (5) are connected to the heat exchange base tube (4) by means of sleeve or string. A base (7) is provided between adjacent double corrugated fins (5) to fix the spacing between the fins. The base (7) is sleeved on the heat exchange base tube (4).

4. The heat exchanger heat exchange method according to claim 1, characterized in that, In step S01, the droplets blocked by the crests of the transverse corrugations flow from the crests to the troughs of the transverse corrugations, agglomerate, and form condensed droplets, which enhance heat transfer with the base tube at the troughs of the transverse corrugations.

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