Gas-liquid heat exchange device

Abstract

The invention discloses a gas-liquid heat exchange device which is provided with an outer pipe and an inner pipe, the inner pipe is arranged on the inner side of the outer pipe and coaxially penetrates through the outer pipe to form a double-pipe heat exchanger, heated liquid flows through a jacket of the outer pipe and the inner pipe, and hot gas exchanges heat with the liquid in the outer pipe for the first time in a heat exchange chamber and then flows through the jacket of the outer pipe and the inner pipe. The hot gas returns to the inner side of the inner pipe and exchanges heat with the liquid again, so that secondary heat exchange between the hot gas and the heated liquid is realized; the device can improve the heat exchange efficiency, reduce the size of the heat exchange device and reduce the volume of the liquid side, and is particularly suitable for application occasions where the volume of liquid is limited or the cost of the liquid is very high and the liquid loading amount needs to be controlled.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange, particularly to the field of shell-and-tube heat exchange technology between gas and liquid. Background Art

[0002] For conventional shell-and-tube heat exchange devices, such as shell-and-tube heat exchangers, plate heat exchangers, etc., the fluid on the high-temperature side transfers heat to the fluid on the low-temperature side through the partition wall, and both the high- and low-temperature fluids pass through the heat exchange partition wall only once. When the temperature difference between the high- and low-temperature fluids is large, the heat exchange efficiency is low. Summary of the Invention

[0003] In order to solve the problem of low heat exchange efficiency of shell-and-tube heat exchange with large temperature difference, the present invention proposes a gas-liquid heat exchange device applicable to heat exchange between high-temperature gas and liquid, which is a shell-and-tube heat exchanger composed of an outer tube and an inner tube. After the high-temperature gas exchanges heat with the low-temperature liquid through the outer tube, it returns to the inner side of the inner tube and exchanges heat with the low-temperature liquid again.

[0004] The gas-liquid heat exchange device of the present invention can improve the heat exchange efficiency, reduce the volume of the heat exchange device, and reduce the volume on the liquid side, and is particularly suitable for application occasions where the volume of the liquid is limited or the cost of the liquid is very high and the liquid loading amount needs to be controlled. Brief Description of the Drawings

[0005] Figure 1 It is the schematic diagram of the gas-liquid heat exchange device of the present invention, and the serial numbers in the figure are: 1 - hot gas upper header 1, inner tube 2, upper tube sheet of inner tube 3, outer tube 4, upper tube sheet of outer tube 5, hot gas connecting pipe 6, hot gas lower header 7, lower tube sheet of inner tube 8, liquid inlet lower header 9, lower tube sheet of outer tube 10, heat exchange chamber 11, liquid outlet upper header 12. Detailed Embodiment

[0006] The gas-liquid heat exchange device of the present invention is composed of a hot gas upper header 1, an inner tube 2, an upper tube sheet of inner tube 3, an outer tube 4, an upper tube sheet of outer tube 5, a hot gas connecting pipe 6, a hot gas lower header 7, a lower tube sheet of inner tube 8, a liquid inlet lower header 9, a lower tube sheet of outer tube 10, a heat exchange chamber 11, and a liquid outlet upper header 12.

[0007] Combined with the above drawings, it is specifically described as follows.

[0008] The inner tube 2 passes through the inside of the outer tube 4, and both ends of the inner tube 2 are welded or expanded with the upper tube sheet of inner tube 3 and the lower tube sheet of inner tube 8 respectively; both ends of the outer tube 4 are welded or expanded with the upper tube sheet of outer tube 5 and the lower tube sheet of outer tube 10 respectively.

[0009] Further, the high-temperature gas enters from the outer tube heat exchange chamber 11, exchanges heat with the outer tube 4, then enters the hot gas lower header 7 through the hot gas connecting pipe 6, and then enters the inner side of the inner tube 2 to exchange heat with the liquid again. Finally, it is discharged through the hot gas upper header 1. The low-temperature liquid enters from the liquid inlet header 9, passes through the jacket between the outer tube 4 and the inner tube 2, and is discharged after entering the liquid outlet upper header 12.

[0010] The above are only application examples of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structures made by using the content of this specification and the drawings, directly or indirectly applied in related technical fields, are included in the patent protection scope of the present invention by the same token.

Claims

1. A gas-liquid heat exchange device is composed of a hot gas upper header (1), an inner tube (2), an inner tube upper tube sheet (3), an outer tube (4), an outer tube upper tube sheet (5), a hot gas connecting pipe (6), a hot gas lower header (7), an inner tube lower tube sheet (8), a liquid inlet lower header (9), an outer tube lower tube sheet (10), a heat exchange chamber (11), and a liquid outlet upper header (12). Its characteristics are as follows: The inner tube (2) passes through the outer tube (4). The two ends of the inner tube (2) are respectively connected to the hot gas upper header (1) and the hot gas lower header (7). The two ends of the outer tube (4) are respectively connected to the liquid outlet upper header (12) and the liquid inlet lower header (9). The outer tube heat exchange chamber (11) is connected to the hot gas lower header (7) through the hot gas connecting pipe (6). After the hot gas exchanges heat with the outer tube (4) in the heat exchange chamber (11), it enters the hot gas lower header (7) through the hot gas connecting pipe (6), and enters the inner side of the inner tube (2) to exchange heat with the liquid in the outer tube (4) again, and finally is discharged from the hot gas upper header (1). The heated liquid enters from the liquid inlet lower header (9), passes through the jacket between the outer tube (4) and the inner tube (2), and is discharged from the liquid outlet upper header (12).

2. The gas-liquid heat exchange device according to claim 1, wherein: The two ends of the inner tube (2) are respectively welded or expanded onto the inner tube upper tube sheet (3) and the inner tube lower tube sheet (8); the two ends of the outer tube (4) are respectively welded or expanded onto the outer tube upper tube sheet (5) and the outer tube lower plate (10).

Images