CN204730708U - A kind of helical deflecting plate pipe and shell type heat exchanger of unequal-interval - Google Patents

Abstract

The utility model belongs to the technical field of heat exchangers and provides a shell-and-tube heat exchanger with spiral baffles with unequal spacing. A shell-and-tube heat exchanger with spiral baffles with unequal spacing proposed includes a cylinder body (4), heat exchange tubes (6), baffle assembly, tube-side inlet pipe (12), and tube-side outlet pipe (13), shell-side inlet connection (14) and shell-side outlet connection (15); the baffle assembly is a spiral baffle (5) formed by overlapping multiple baffles; two adjacent baffles The length of the plate overlap gradually increases along the fluid flow direction of the shell side, that is, the distance between two adjacent baffles gradually decreases along the fluid flow direction of the shell side. The distance between the baffles is the largest, and the distance between two adjacent baffles near the shell-side outlet pipe (15) is the smallest. The utility model avoids the vibration of the tube bundle, reduces the heat exchange area and prolongs the service life of the heat exchanger.

Description

A shell-and-tube heat exchanger with unequal spacing of spiral baffles

technical field

The utility model belongs to the technical field of heat exchangers, in particular to a shell-and-tube heat exchanger with spiral baffles with unequal spacing.

Background technique

The shell-side support structures of the existing shell-and-tube condensers include single-bow baffles, double-bow baffles, and spiral baffles, among which the support of the spiral baffles adopts the same pitch, that is, the baffles are arranged at equal intervals. The condensed fluid goes through the shell side, and has equal flow area in different spiral periods, and the shell side fluid flows smoothly and condenses continuously in a spiral direction along the axial direction of the heat exchanger. The spiral flow can effectively reduce the heat transfer dead zone and slow down Scale deposition, while avoiding the serious pressure loss caused by the large-angle reentry of the fluid, the pressure drop is small; but at the inlet of the shell side, due to the large volume flow rate and high flow rate of the gas phase of the shell side fluid, it is easy to cause vibration of the tube bundle; with the shell side The fluid continuously condenses, the volume flow rate decreases gradually, and the flow rate decreases, which will easily lead to the gas-liquid two-phase stratified flow, which is not conducive to the heat transfer. minimum.

Utility model content

In order to solve the above technical problems, the purpose of this utility model is to propose a shell-and-tube heat exchanger with spiral baffles with unequal spacing.

The utility model adopts following technical scheme for accomplishing the above object:

A spiral baffle shell-and-tube heat exchanger with unequal spacing. The spiral baffle shell-and-tube heat exchanger includes a cylinder, a heat exchange tube, a baffle assembly, a tube-side inlet tube, a tube The outlet pipe of the shell side, the inlet pipe of the shell side and the outlet pipe of the shell side; the heat exchange tube bundle composed of a plurality of heat exchange tubes arranged in parallel passes through the baffle plate assembly, and its two ends are arranged on the front tube plate and the rear tube plate; The baffle assembly is a spiral baffle formed by overlapping multiple baffles; the baffle is a quarter fan-shaped baffle or an elliptical baffle; two adjacent baffles The length of the overlap of the baffles increases gradually along the fluid flow direction of the shell side, that is, the distance between two adjacent baffles gradually decreases along the fluid flow direction of the shell side, and the two adjacent baffles near the inlet pipe of the shell side The distance between the baffles is the largest, and the distance between two adjacent baffles near the outlet pipe of the shell side is the smallest.

The utility model proposes a spiral baffle shell-and-tube heat exchanger with unequal spacing. The baffles are arranged at unequal intervals, and the baffles are changed by adjusting the lap length between two adjacent baffles. There is the largest baffle spacing at the shell side inlet, the helical baffle spacing gradually decreases along the shell side fluid flow direction, and the smallest baffle spacing is at the shell side exit, which further strengthens the helical baffle tube-shell conversion. The shell-side heat transfer performance of the heater is improved, and the vibration of the tube bundle is avoided; as the shell-side fluid continues to condense, the flow area gradually decreases, so that the shell-side fluid still maintains a high flow rate and no gas-liquid stratification occurs Flow phenomenon, so as to ensure high heat transfer coefficient at different positions along the shell side, thereby reducing the heat transfer area and prolonging the service life of the heat exchanger.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of the layout of the spiral baffles in the present invention.

In the figure: 1. Front tube box, 2. Tube box flange, 3. Front tube plate, 4. Cylinder body, 5. Spiral baffle, 6. Heat exchange tube, 7. Rear tube plate, 8. Tube box Flange, 9, rear pipe box, 10, sliding saddle, 11, fixed saddle, 12, tube side inlet pipe, 13, tube side outlet tube, 14, shell side inlet connection, 15, shell side outlet connection.

Detailed ways

The utility model is described in conjunction with the accompanying drawings and specific embodiments. The structure of the shell-and-tube heat exchanger in the utility model adopts the existing technical structure in the prior art, and the utility model only involves the structural design of the baffle;

As shown in Figure 1, a spiral baffle shell-and-tube heat exchanger with unequal spacing, the spiral baffle shell-and-tube heat exchanger includes a cylinder 4, heat exchange tubes 6, baffles Assembly, tube-side inlet pipe 12, tube-side outlet pipe 13, shell-side inlet connection pipe 14 and shell-side outlet connection pipe 15; a heat exchange tube bundle composed of a plurality of heat exchange tubes 6 arranged in parallel passes through the baffle assembly and its two ends are arranged On the front tube sheet 3 and the rear tube sheet 7; the front end of the front tube sheet 3 is connected to the front end tube box 1, and the rear end of the rear tube sheet 7 is connected to the rear end tube box 9; the tube pass inlet pipe 12 is set On the rear pipe box 9; the tube side outlet pipe 13 is arranged on the front end pipe box 1; the shell side inlet joint 14 and the shell side outlet joint 15 are all arranged on the cylinder body 4; in conjunction with FIG. 2 , The baffle assembly is a spiral baffle 5 formed by lapping multiple baffles; the baffle is a quarter fan-shaped baffle or an elliptical baffle; two adjacent The overlapping length of the two baffles gradually increases along the fluid flow direction of the shell side, that is, the distance between two adjacent baffles gradually decreases along the fluid flow direction of the shell side, and the near shell side inlet pipe 14 The distance between two adjacent baffles is the largest, and the distance between two adjacent baffles near the shell-side outlet pipe 15 is the smallest.

Claims (1)

1. a helical deflecting plate pipe and shell type heat exchanger for unequal-interval, described helical deflecting plate pipe and shell type heat exchanger includes cylindrical shell (4), heat exchanger tube (6), deflection plate assembly, tube-side inlet pipe (12), tube side outlet (13), shell side inlet adapter (14) and shell-side outlet adapter (15); The heat-exchanging tube bundle that multiple heat exchanger tube (6) be arranged in parallel forms is arranged on front tube sheet (3), back tube sheet (7) through its two ends of deflection plate assembly; Described deflection plate assembly is the helical baffles (5) overlapped by polylith deflection plate; Described deflection plate is 1/4th segmental baffles or oval deflection plate; It is characterized in that: the length of adjacent two described deflection plate overlap joints increases gradually along shell-side fluid flow direction, namely the spacing between adjacent two described deflection plates reduces gradually along shell-side fluid flow direction, spacing between adjacent two the described deflection plates in nearly shell side inlet pipe (14) place is maximum, and the spacing between adjacent two the described deflection plates in nearly shell-side outlet pipe (15) place is minimum.