RU25586U1 - SHELL-TUBE COIL HEAT EXCHANGER - Google Patents

Description

The utility model relates to heat engineering and can be used in various fields of technology and industry.

Known shell-and-tube coil heat exchanger containing installed inside the cylindrical casing bundle of coil pipes made in the form of spatial spirals with different outer diameters and winding angles of US Pat. RF number 2102673,

class F 28 D 7/02, op. 1998. A disadvantage of the known heat exchanger

is the low velocity of the coolant relative to the outer walls of the coil pipes and low flow turbulence, which generally reduces the heat transfer coefficient of the heat exchanger.

The purpose of the utility model is to eliminate these drawbacks.

This goal is achieved by the fact that in a shell-and-tube coil heat exchanger containing a casing with technological nozzles, inside which are installed the inlet and outlet headers and the bundle of coil pipes connected to them by their ends, according to the utility model, the coil pipes are made in the form of parallel-mounted spatial spirals with the same diameter and the angle of winding, and the casing is box-shaped with rounding of the ribs and the presence of partitions in the area of the hollows of the coil pipes.

In this case, the axle distance and the outer diameter of the tubes of the shell-and-tube coil heat exchanger can be interconnected by the following ratio:

where: d is the outer diameter of the tube;

S is the center distance; 9-angle winding, 9 15 ... 45 °.

A comparative analysis of the inventive heat exchanger with the prototype and with other solutions in the art shows that the set of features set forth in the patent formula is unknown from the existing prior art, on the basis of

S d / sin9,

what can be concluded about its compliance with the criterion of a utility model

novelty.

The compliance of the proposed solution with the criterion of industrial applicability can be seen from the following example of a specific implementation of the heat exchanger.

The utility model is illustrated in the drawing, where in FIG. 1 schematically shows a general view of a shell-and-tube coil heat exchanger, and FIG. 2 shows a cross-section of a shell-and-tube coil heat exchanger.

The list of symbols in the drawing.

1 - casing;

2,3,4, 5 - nozzles;

6 - coil pipes;

7, 8 - collectors;

9 - partitions.

The shell-and-tube coil heat exchanger comprises a box-shaped casing 1 with process pipes 2, 3, 4, and 5, inside of which a bundle of coil tubes 6 is placed, connected by its end parts to the inlet and outlet manifolds 7 and 8, respectively. Coil pipes 6 are made in the form of spatial spirals with the same diameter and pitch of winding.

ribs, and the outer diameter and angle of winding of the spiral tubes 6 are connected by the ratio: S d / sin9,

where: d is the outer diameter of the tube;

S is the center distance; 9- winding angle, 9 15 .. .45 °.

To intensify the washing off of the outer surface of the coil pipes 6 by the heat carrier, transverse partitions 9 are fixed on the inner surface of the casing 1 in the area of the hollows of the coil pipes 6.

The shell-and-tube coil heat exchanger is as follows.

The first coolant, for example, heated gas, is supplied to the pipe 2, fills the cavity of the casing 1 and exits through the pipe 3. The second coolant, for example, the cooled gas, is fed into the pipe 4, fills the inlet manifold 7, is evenly distributed over the coil pipes 6, fills the outlet manifold 8 and is discharged through the nozzle 5. The first coolant washes the pipes 6 and heats up, and the second is cooled.

Due to the developed surface of the coil pipes 6, the compactness of the heat exchanger is ensured. At the same time, due to the reduction in the cross-sectional area of the annular space of the casing 1, the intersection of the projections of the coil pipes 6 and the presence of partitions 9, the gas becomes turbulent and accelerates

coolant, which significantly increases the heat transfer coefficient of the heat exchanger.

The implementation of the coil pipes in the form of spatial spirals of the same diameter and angle of winding ensures ease of manufacture of coils and manufacturability (assembly)

heat exchanger as a whole. The authors:

Zubkov V.I.

Litvinov V.V.

Telichkin D.V.

Claims (4)

1. Shell-and-tube coil heat exchanger containing a casing with process pipes, inside which are installed the inlet and outlet manifolds and a bundle of coil pipes connected to them by their ends, characterized in that the coil pipes are made in the form of parallel spatial spirals with the same diameter and angle of winding, and the casing is box-shaped. 2. Shell-and-tube coil heat exchanger according to claim 1, characterized in that the center distance and the outer diameter of the pipes are interconnected by the following ratio:
S≥d / sin♀,
where d is the outer diameter of the pipe;
S is the center distance;
♀ - winding angle, ♀ = 15 ... 45 ^o .  3. Shell-and-tube coil heat exchanger according to claim 1, characterized in that on the inner surface of the casing in the zone of the hollows of the coil pipes transverse partitions are fixed. 4. The shell-and-tube coil heat exchanger according to claim 1, characterized in that the casing is made with rounding the ribs.