RU191390U1 - INTENSIFIED HEAT EXCHANGE PIPE OF THE GAS-AIR AIR HEAT EXCHANGER - Google Patents

Abstract

The utility model relates to heat exchangers and can be used to cool the combustion products of gas turbine units with air in a combined cycle gas turbine power plant. The objective of the utility model is to develop an intensified heat exchange tube for a gas-air heat exchanger, which eliminates the disadvantages of analogues and prototype. The technical result of the utility model is the improvement of heat transfer on the outer surface due to the transverse arrangement of the intensifying rings (air trap) and their shape, the improvement of internal heat transfer is associated with a screw duct in which the gas moves in a spiral, which also contributed to reducing the length of the pipe. that the intensified heat exchange tube of a gas-air heat exchanger containing a turbulator (gas guide shield) and fins (air traps), agrees About this utility model, air traps are claw-shaped transverse rings welded to the pipe with continuously variable wave-shaped geometry along the back (outer surface) of the air trap and parabolic in the trough (inner surface) of the air trap, and inside the tube there is a bar (core) with triangular installation grooves and labyrinth seals, on which a metal corrugated strip is welded in a spiral, the retention of which is carried out not only by adhering to the walls e, as well as the core of the turbulator (gas shield), the core is held by the cover of the gas shield with a tight fit. Using the proposed utility model, in comparison with the prototype, will intensify the heat transfer process on the outer wall of the pipe, allow its use at high temperatures and pressure, will allow to refuse from consumables for maintenance, namely from gaskets, seals and the like. Thanks to this design, cooling and heating are more intense.

Description

The utility model relates to heat exchangers and can be used to cool the combustion products of gas turbine units with air in a combined cycle gas turbine power plants.

Analogs are:

1) The heat exchange apparatus according to the patent RU 22233, IPC F28D 7/10, 03/10/2002, containing a screw channel. One of the coolant involved in the process is supplied to the inlet pipe and a circular motion is made around the heat transfer surface, thereby transmitting energy to the second coolant.

The disadvantages are the large length due to the direct inner channel, the presence of oil seals and release bushings, due to this there is a longer maintenance.

2) Screw heat exchanger according to patent RU 132872, IPC F24H 1/00, 09/27/2013. The first heat carrier is supplied from the outside of the pipe to the screw channel and makes circular motions; the second heat carrier passes inside the pipe. Distinctive from the patent RU 22233, IPC F28D 7/10, 03/10/20002, is the sequential operation of several blocks to increase heat transfer.

The disadvantages are the bulkiness of the design, the presence of a lip seal and a direct internal channel, which makes it large enough and more time is spent on maintenance.

The prototype is a heat exchange element according to the patent of the Russian Federation RU 2377490, IPC F28F 1/10, F28F 1/42, 12/27/2009, contains a pipe with longitudinal ribs, the pipe consists of two symmetrical halves, the halves are welded, a turbulator is installed inside, it rests against its angles in pipe wall.

The disadvantages are the low reliability due to the welding of two halves, which makes it unreliable when used in high pressure and temperature conditions, also this shape of the ribs does not allow more efficient heat transfer process, due to lower clamping force to the wall of the heat exchanger pipe.

The objective of the utility model is the development of an intensified heat exchange tube of a gas-air heat exchanger, which eliminates the disadvantages of analogues and prototype.

The technical result of the utility model is the improvement of heat transfer on the outer surface due to the transverse arrangement of the intensifying rings and their shape, the improvement of internal heat transfer is associated with the presence of a turbulator, in which the gas moves in a spiral, which also helps to reduce the length of the pipe.

The technical result is achieved by the fact that the intensified heat-exchange tube of a gas-air heat exchanger containing a turbulator and intensifying rings, according to the present utility model, intensifying rings are transverse claw-shaped rings welded to the pipe with smoothly varying wave-like geometry along the back, i.e. the outer surface of the intensifying ring and parabolic in the trough, that is, the inner surface of the intensifying ring, and inside the pipe has a rod with triangular grooves for installation and labyrinth seals, on which a metal corrugated strip is welded in a spiral, which is held by the rod of the turbulator, the rod is held by the cover of the turbulator with an interference fit.

The essence of the utility model is presented in the drawing (Fig. 1), which shows the intensified heat exchange tube of a gas-air heat exchanger assembly. In FIG. Figure 2 shows a diagram of the movement of coolants through a pipe, the direction of flows is indicated, where red indicates hot coolant, and blue indicates cold coolant.

In the drawing, the numbers indicate:

1 - turbulator cover;

2 - turbulator;

3 - tube plate;

4 - nuts;

5 - pipe;

6 - intensifying ring;

7 - bolts;

8 - the back of the intensifying ring;

9 - trough of the intensifying ring;

10 - a place along the contour of which welding is performed.

In FIG. 1 shows the design of the tube block. The main view shows the unit assembly; View A is shown from the exhaust side; view B - in the section between the intensifying rings; view B is a method of attaching a turbulator in a 4: 1 scale; type G - grooves are shown that hold the gas flow from leaks.

This intensified heat transfer tube is intended for use in a shell-and-tube heat exchanger and only for operation in a gas environment.

The intensified pipe contains a seamless pipe 5, inside which a turbulator 2 is installed, which has a holding rod with a triangular groove and a labyrinth seal, onto which a corrugated steel strip is helically welded. The pipe 5 is flange-mounted to the tube plate 3, over the pipe flange the lid of the turbulator 1 is mounted, in which there are four input channels. The fastening of the pipe 5 to the tube plate 3 is carried out with the help of bolts 7, and the cover with the help of nuts 4. On top of the pipe by welding 10 are cast reinforcing rings 6, which have a claw-like shape with a changed geometry.

The proposed intensified heat transfer tube is characterized in that in the middle of the lid there is a triangular groove of the turbulator in the form of a triangle, which is shown in B. In order to exclude movements of the turbulator, there is a ring on the rod. To prevent leakage through the turbulator lock, there is a labyrinth seal shown in G. view. Intensifying rings 6 allow you to direct a larger stream of heated air to the heat transfer walls. As seen in FIG. 1, the shape of the intensifying ring is not straight, the back, that is, the outer surface 8 is made in the form of a wave in which there is a smooth change in the direction angle by 10-15 degrees in the middle, this is necessary to direct the air flow to the middle of the trough, that is, the inner surface of the intensifying ring 9. This smooth change in the angle of entry of the flow is explained by a decrease in the load on the base of the intensifying ring. The trough of the intensifying ring is made by smoothly changing the angle, which looks like a parabola branch, the height difference between the end and the root of the back of the intensifying ring is 1/3 of the width of the intensifying ring.

The principle of operation of the proposed intensified heat transfer pipe is shown in FIG. 2 and is described as follows: the hot flow is fed into the pipe 5, thanks to the turbulizer 2, the flow is twisted, due to the centrifugal force of the incoming flow and the swirl, the heat transfer is intensified. Important points are flow directions: the hot stream should be directed as in FIG. 2, i.e. from the back of the intensifying ring 8, and the flow of cold air should be directed in the opposite direction with respect to the hot heat carrier, i.e. from the side of the trough of the intensifying ring 9. On a view A shows the entrance of a hot stream. The movement of the cold stream follows the following trajectory: on the first intensifying ring, the stream is normally hit by the trough, the stream flowing around it is slightly twisted, on the remaining steps the stream goes in several directions, in the first stage, the stream hits the back and moves due to the difference in angles to the center of the trough of the next ring, the second stream begins to enter from the top of the trough, mixes, slightly reducing speed and spins. In this case, heat transfer is intensified.

Using the proposed utility model, in comparison with the prototype, will intensify the heat transfer process on the outer wall of the pipe, allow its use at high temperatures and pressures, and will allow consumables for maintenance to be abandoned, namely seals, gaskets, and the like.

Thanks to this design, cooling and heating are more intense.

Claims (1)

An intensified heat-exchange tube of a gas-air heat exchanger containing a turbulator and transverse intensifying rings welded to the pipe, characterized in that the intensifying rings are claw-shaped with a smoothly varying wave-shaped geometry along the outer surface of the back of the intensifying ring and a parabolic shape along the inner surface of the intensifying ring trough, a the turbulator is made in the form of a bar with a spiral welded metal corrugated strip minutes and installed inside the pipe.

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