Shell-and-tube heat exchanger with ribbed tubes

FIELD: heating.

SUBSTANCE: invention relates to heat exchange apparatus and can be used in power engineering, gaseous, metallurgical, chemical and food industrial sectors. The shell-and-tube heat exchanger contains a system of different-type partitions, alternating among themselves along the shell forming chambers in the tube side, part of which is installed with a circular clearance relative to the shell, and the others are adjacent to the shell and are supplied with a central hole. In the chambers there are longitudinal spiral partitions with opposite spin angle, aligned to them and adjacent ends to the edges of the perpendicular partition. The pipes are provided with fins, and the fins are made in such sizes and shapes, that a helical cavity is formed on the inner surface of the heat-exchanger shell. The fins can be made from different-type partitions, alternating among themselves along the shell forming chambers in the tube side, depending on the versions of implementing the fins. The heated medium is directed either tangentially along the helical cavity, or turned by 180. To improve contact of the fins with the pipe, a "skirt" is formed.

EFFECT: intense heat transfer.

2 dwg

 

The invention relates to heat exchange apparatus and can be used in the power, gas, metallurgy, chemical and food industries.

Known shell-and-tube heat exchanger, comprising a housing with a system of diverse transverse partitions, alternating between the length of the casing with the formation of the chambers in the annular space (see, for example, Wimbledon, Mairehau. Calculation of heat exchangers of steam turbines. Yekaterinburg, 2001, p.64-78).

Known shell-and-tube heat exchanger, in which the transverse partitions in the cells between them are additional longitudinal bulkhead opposite angles of twist (see, for example, U.S. Patent No. 3958630, CL F28F 9/22, publ. 1976). However, such organization of the flow part of the environment is not involved in cross flow tubes and wrap around them along through the gaps in the holes of the intermediate partitions, which naturally affects the heat transfer.

The purpose of the invention is the intensification of heat transfer.

This goal is achieved by the fact that in shell-and-tube heat exchanger containing a heterogeneous system partitions, alternating between the length of the casing with the formation of the chambers in the annular space, part of which is installed with an annular gap relative to the casing, and the remaining approx the cabins to the casing and provided with a Central hole, the cameras are additional longitudinal spiral septum to the opposite angle of twist in the adjacent of them and attached the ends to the edges of the transverse walls, the pipes are provided with plate fins and plate fins are of such sizes and shapes that form the inner surface of the casing of the heat exchanger coil cavity, in addition, the plate fins can be made heterogeneous, and alternating between the length of the casing of the heat exchanger with the formation of the chambers in the annular space, depending on the implementation of the edges of the heated environment is either tangentially along a helical cavity, or rotated through 180, to increase the contact plates of the fins with the tubes established a "skirt".

The proposed heat exchanger characterized in that the tube is supplied with plate fins, which perform the role of intermediate partitions, and the size and shape of the plates are designed so that they form a flow direction or along a helical line (figure 1), or rotated 180 (figure 2), which provides the most complete cross-flow tubes heat exchange surface. In addition, to improve the contact plates of the fins with the tubes formed "skirt" (figure 5).

Figure 1-4 shows the longitudinal and transverse sections of the proposed heat appliances ... is. Figure 5 shows the connection plate fins with a tube in the form of a "skirt".

1 - finned tube;

2 - pipe Board;

3 - plate fins;

4 - casing;

5 - cavity between the shell and the plate fins;

6 - "skirt".

Shell-and-tube heat exchanger contains a finned tube 1, is fixed in the tube plate 2 fastened to the tube plate fin 3. The plate fins are of such sizes and shapes that they form with the inner surface of the housing 4 screw cavity 5 (see figure 1). In addition, the plate fins 3 can be made heterogeneous, and alternating between the length of the housing 4 with the formation of the chambers 5 in the annular space (see figure 2).

The heat exchanger works as follows.

The heating medium circulates in the tube cavity. Heating medium is supplied uniformly in the annular space and depending on the implementation of the ribs is either tangentially along a helical cavity, or rotated 180.

Shell-and-tube heat exchanger containing a heterogeneous system partitions alternating between the length of the casing with the formation of the chambers in the annular space, part of which is installed with an annular gap relative to the casing, and the other adjacent to the casing and provided with a Central hole, in chambers placed additionally p is dolinie spiral septum to the opposite angle of twist in the adjacent of them and attached the ends to the edges of the transverse partitions, wherein the tube is provided with a plate fins and plate fins are of such sizes and shapes that form the inner surface of the casing of the heat exchanger coil cavity, in addition, the plate fins can be made heterogeneous, and alternating between the length of the casing of the heat exchanger with the formation of the chambers in the annular space, depending on the implementation of the edges of the heated environment is either tangentially along a helical cavity, or rotated through 180, to increase the contact plates of the fins with the tubes formed "skirt".



 

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