A downflow two-phase flow uniform distribution structure of an aluminum plate-fin heat exchanger

Abstract

The present invention discloses a downward two-phase flow uniform distribution structure of an aluminum plate-fin heat exchanger, comprising a plate-fin heat exchanger core, wherein the upper end of the fin heat exchanger core is connected to a gas-liquid two-phase flow inlet head, and the gas-liquid two-phase flow inlet head comprises a liquid phase uniform distribution orifice plate, and the liquid phase uniform distribution orifice plate separates the gas-liquid two-phase flow inlet head into two independent upper spaces and lower spaces, and a plurality of uniformly arranged gas phase uniform distribution pipes are vertically connected to the upper surface of the liquid phase uniform distribution orifice plate, and the gas phase uniform distribution pipes can connect the upper space and the lower space of the gas-liquid two-phase flow inlet head, and a plurality of uniformly arranged through holes are also provided on the upper surface of the liquid phase uniform distribution orifice plate, and there is no need to set up a two-phase flow uniform distribution device of a gas-liquid separator, the structure is low-cost and simple, the gas phase flows to the gas-liquid mixing channel through the liquid phase uniform distribution orifice plate, and the local resistance is small, and the liquid phase flows downward into the gas-liquid mixing channel by gravity, and the resistance drop is small, the gas phase and the liquid phase flow in the same direction, the total flow resistance drop is very small, and the flow resistance is small.

Description

Technical Field

[0001] The present invention relates to a two-phase flow uniform distribution structure, more specifically, to a downflow two-phase flow uniform distribution structure of an aluminum plate-fin heat exchanger, belonging to the technical field of gas-liquid uniform distribution and flow deviation prevention of two-phase flow of aluminum plate-fin heat exchangers. Background Art

[0002] Aluminum plate-fin heat exchanger is a kind of equipment widely used in air separation, petrochemical, natural gas, coal chemical and other fields. Its heat transfer area per unit volume can be as high as 1500m 2 The above has the characteristics of small size and high heat transfer efficiency. In the core of the plate-fin heat exchanger, each fluid has several layers of channels. After the fluid, especially the gas-liquid two-phase flow, enters the plate-fin heat exchanger, whether the gas-liquid two-phase fluid can be evenly distributed to each layer of channels is particularly important for the heat transfer performance of the plate-fin heat exchanger. The existing aluminum plate-fin heat exchanger two-phase flow uniform distribution structure achieves the purpose of uniform distribution by additionally setting uniform distribution elements in the heat exchanger core, which will lead to: ① The local resistance at the uniform distribution element is very large, which increases the fluid flow resistance, ② Increases the material and processing costs, ③ Causes local stress concentration at the brazing of the uniform distribution element and the partition, affecting the service life of the heat exchanger, ④ affects the brazing strength and quality of the plate-fin heat exchanger core. Summary of the invention

[0003] In order to solve the above-mentioned problems in the prior art, the present invention provides an aluminum plate-fin heat exchanger with a downflow two-phase flow uniform distribution structure having the technical characteristics of low cost, simple structure, and no need to separately set up a gas-liquid separator.

[0004] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0005] A downward two-phase flow uniform distribution structure of an aluminum plate-fin heat exchanger comprises a plate-fin heat exchanger core, the upper end of the fin heat exchanger core is connected to a gas-liquid two-phase flow inlet head, the gas-liquid two-phase flow inlet head comprises a liquid phase uniform distribution orifice plate, the liquid phase uniform distribution orifice plate separates the gas-liquid two-phase flow inlet head into two independent upper spaces and lower spaces, a plurality of uniformly arranged gas phase uniform distribution pipes are vertically connected to the upper surface of the liquid phase uniform distribution orifice plate, the gas phase uniform distribution pipes can connect the upper space and the lower space of the gas-liquid two-phase flow inlet head, and a plurality of uniformly arranged through holes are also provided on the upper surface of the liquid phase uniform distribution orifice plate.

[0006] As an improvement, the liquid phase uniformly distributed orifice plate is horizontally connected to the gas-liquid two-phase flow inlet header.

[0007] As an improvement, at least one layer of gas-liquid phase mixing channel is provided in the core of the fin-type heat exchanger, and guide vanes and heat transfer fins are provided in the gas-liquid phase mixing channel.

[0008] As an improvement, the upper end of the gas-liquid two-phase flow inlet head is connected to a plurality of evenly arranged connecting pipes.

[0009] As an improvement, the liquid phase uniform distribution orifice plate is rectangular, and the gas phase uniform distribution tubes are provided with 48, 6 gas phase uniform distribution tubes are arranged in a row at intervals, and each row is arranged at equal intervals.

[0010] As an improvement, the through holes cover the entire liquid phase uniformly distributed orifice plate.

[0011] As an improvement, the liquid phase uniform distribution orifice plate is circular, and the gas phase uniform distribution tubes are provided with 48 tubes, and the gas phase uniform distribution tubes are arranged to form a plurality of concentric circles with the center of the liquid phase uniform distribution orifice plate as the center of the circle.

[0012] Beneficial effect: Compared with the prior art, the present application sets the gas-liquid two-phase flow inlet head outside the heat exchanger core body, and there is no need to set up a two-phase flow distribution device of the gas-liquid separator. It has low cost and simple structure. The gas phase flows to the gas-liquid mixing channel through the liquid phase uniform distribution orifice plate, and the local resistance is small, while the liquid phase flows downward into the gas-liquid mixing channel by gravity, and there is almost no resistance drop. The gas and liquid phases flow in the same direction, and the total flow resistance drop is very small, which has the characteristic of small flow resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 It is a front view of the liquid phase uniformly distributed orifice plate of the present invention.

[0015] Figure 3 It is a top view of the liquid uniformly distributed orifice plate of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0017] like Figure 1-3The figure shows a specific embodiment of a downflow two-phase flow uniform distribution structure of an aluminum plate-fin heat exchanger, an aluminum plate-fin heat exchanger downflow two-phase flow uniform distribution structure, comprising a plate-fin heat exchanger core 1, the upper end of the fin heat exchanger core 1 is connected to a gas-liquid two-phase flow inlet head 2, the gas-liquid two-phase flow inlet head 2 comprises a liquid phase uniform distribution orifice 3, the liquid phase uniform distribution orifice 3 separates the gas-liquid two-phase flow inlet head 2 into two independent upper spaces and lower spaces, a plurality of uniformly arranged gas phase uniform distribution pipes 4 are vertically connected to the upper surface of the liquid phase uniform distribution orifice 3, and the gas phase uniform distribution pipes 4 can flow the gas-liquid two-phase flow into The upper space and the lower space of the head 2 are connected, and a plurality of evenly arranged through holes 5 are provided on the upper surface of the liquid phase uniformly distributed orifice plate 3. The upper end opening of the gas phase uniformly distributed pipe 4 is designed to be higher than the upper end opening of the through hole 5, so that the liquid phase forms a liquid layer of a certain height on the upper surface of the liquid phase uniformly distributed orifice plate 3, and drips evenly to the inlet guide port of the plate-fin heat exchanger core 1 through the through holes on the liquid phase uniformly distributed orifice plate 3 under gravity, with almost no resistance drop, and the gas phase flows to the gas-liquid mixing channel through the gas phase uniformly distributed pipe 4, with small local resistance, the gas phase and the liquid phase flow in the same direction, and the total flow resistance drop is very small, which has the characteristics of small flow resistance;

[0018] The gas-liquid two-phase flow enters the space above the gas-liquid flow inlet head 2 through an ordinary connecting pipe, and gas-liquid separation is realized in the gas-liquid two-phase flow inlet head 2. Specifically, the liquid phase forms a liquid layer of a certain height on the upper surface of the liquid phase uniformly distributed orifice plate 3, and drips downward evenly through the through hole 5 on the liquid phase uniformly distributed orifice plate 3 to enter the gas-liquid mixing channel 6. The gas phase enters the lower cavity through the gas phase uniformly distributed pipe 4. After the gas phase also uniformly enters the gas-liquid mixing channel 6 under the action of back pressure, gas-liquid uniform distribution is realized in the gas-liquid mixing channel 6. In the early stage, when the liquid phase has not formed a liquid layer of a certain height on the upper surface of the liquid phase uniformly distributed orifice plate 3, part of the gas phase will pass through the through hole 5 downward.

[0019] As an improved embodiment, the liquid phase uniformly distributed orifice plate 4 is horizontally connected to the gas-liquid two-phase flow inlet head 2, so that the liquid phase forms a liquid layer of a certain height on the upper surface of the liquid phase uniformly distributed orifice plate 3, and drips downward evenly under gravity.

[0020] As an improved implementation method, at least one layer of gas-liquid mixing channel 6 is arranged in the fin-type heat exchanger core 1, and the gas-liquid mixing channel 6 is provided with guide vanes and heat transfer fins. The liquid phase forms a liquid layer of a certain height on the upper surface of the liquid phase uniformly distributed orifice plate 3, and drips down evenly to the gas-liquid mixing channel 6 through the uniformly distributed small holes on the liquid phase uniformly distributed orifice plate 3. After the gas phase also uniformly enters the gas-liquid mixing channel 6 under the action of back pressure, gas-liquid uniform distribution is achieved in the gas-liquid mixing channel 6.

[0021] As an improved implementation method, the upper end of the gas-liquid two-phase flow inlet head 2 is connected to a plurality of evenly arranged connecting pipes, which can realize pre-uniform distribution of the gas-liquid two-phase flow before entering the gas-liquid two-phase flow inlet head 2. On the basis of the above scheme, a baffle is arranged between the liquid phase uniform distribution orifice plate 3 and the connecting pipe in the space above the gas-liquid two-phase flow inlet head 2 to prevent fluid impact and enhance the separation effect.

[0022] As an improved implementation method, the liquid phase uniform distribution orifice plate 3 is rectangular, and the gas phase uniform distribution tubes 4 are provided with 48, and 6 gas phase uniform distribution tubes 4 are arranged in a row at intervals, and each row is arranged at equal intervals. It has a simple structure and strong practicality, and the specific number can be selected according to actual conditions.

[0023] As an improved embodiment, the through holes 5 cover the entire liquid phase uniform distribution orifice plate 3 .

[0024] As an improved implementation method, the liquid phase uniform distribution orifice plate 3 is circular, and the gas phase uniform distribution tubes 4 are provided with 48. The gas phase uniform distribution tubes 4 are surrounded by a plurality of concentric circles with the center of the liquid phase uniform distribution orifice plate 3 as the center of the circle. The structure is simple and practical, and the specific number can be selected according to actual conditions.

[0025] Finally, it should be noted that the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.

Claims

1. A downflow two-phase flow uniform distribution structure of an aluminum plate-fin heat exchanger, comprising a plate-fin heat exchanger core (1), characterized in that: The upper end of the plate-fin heat exchanger core (1) is connected to a gas-liquid two-phase flow inlet header (2), and the gas-liquid two-phase flow inlet header (2) includes a liquid phase uniformly distributed perforated plate (3), and the liquid phase uniformly distributed perforated plate (3) separates the gas-liquid two-phase flow inlet header (2) into two independent upper spaces and lower spaces. A plurality of uniformly arranged gas phase uniformly distributed pipes (4) are vertically connected to the upper surface of the liquid phase uniformly distributed perforated plate (3), and the gas phase uniformly distributed pipes (4) can connect the upper space and the lower space of the gas-liquid two-phase flow inlet header (2). The upper surface of the liquid phase uniformly distributed perforated plate (3) is also provided with a plurality of The liquid phase uniformly distributed orifice plate (3) is horizontally connected to the gas-liquid two-phase flow inlet header (2); at least one layer of gas-liquid phase mixing channel (6) is provided in the plate-fin heat exchanger core (1), and the gas-liquid phase mixing channel (6) is provided with guide vanes and heat transfer fins; the upper end of the gas-liquid two-phase flow inlet header (2) is connected to a plurality of uniformly distributed connecting pipes; the liquid phase uniformly distributed orifice plate (3) is rectangular, and the gas phase uniformly distributed pipes (4) are provided with 48, and 6 gas phase uniformly distributed pipes (4) are arranged in a row at intervals, and each row is arranged at equal intervals.

2. The downflow two-phase flow uniform distribution structure of an aluminum plate-fin heat exchanger according to claim 1, characterized in that: The through holes (5) cover the entire liquid phase uniform distribution orifice plate (3).

3. The downflow two-phase flow uniform distribution structure of an aluminum plate-fin heat exchanger according to claim 1, characterized in that: The liquid phase uniform distribution orifice plate (3) is circular, and 48 gas phase uniform distribution tubes (4) are provided. The gas phase uniform distribution tubes (4) are arranged to form a plurality of concentric circles with the center of the liquid phase uniform distribution orifice plate (3) as the center of the circle.

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