RU177119U1 - SHELL-TUBE HEAT EXCHANGER - Google Patents

Abstract

A shell-and-tube heat exchanger comprising a cylindrical body 1 with bottoms 2 and 3, nozzles 4 and 5 of the inlet and outlet of the coolant of the tube space, nozzles 6 and 7, respectively, of the inlet and outlet of the coolant of the annulus, tube boards 8 and 9, in the openings of which, using fittings with clamping nuts, fixed twisted thin-walled corrugated pipe 10 of stainless steel. Tube boards 8 and 9 are fixed between the flanges of the housing 1 and the bottoms 2 and 3 through the gaskets 11 using bolts 12. This heat exchanger is simple to manufacture and reliable in operation. The design of the heat exchanger allows you to quickly, without the use of special technical means and tools, carry out its assembly, disassembly and repair if necessary. The use of corrugated stainless pipes with a simultaneous increase in their length in this heat exchanger significantly increases the effective heat transfer surface in comparison with smooth copper pipes. 1 n and 2 z.p. f-ly, 7 ill.

Description

The utility model relates to a power system, to heat exchange equipment, and can be applied in the energy, chemical, petrochemical, and other industries, when carrying out heterogeneous catalytic oxidation, dehydrogenation, and other processes.

Known shell-and-tube heat exchanger containing a casing of cylindrical shape, pipes with tube sheets, bottoms and nozzles of the input and output flows (ed. St. Invention SU No. 345336, IPC F28D 7/00, F28DF 9/22. Shell-and-tube heat exchanger / Yazik A.V. ., Maznichenko N.F., Kuznetsov L.V .; applicant Ukrainian scientific research institute of natural gases. - No. 1438326 / 24-6; declared 04/05/1970; publ. 07/14/1972. Bull. No. 22).

This heat exchanger is difficult to manufacture and repair. In addition, to ensure a zigzag motion of the medium, transverse partitions of a special shape are used in the heat exchanger, which significantly increases the metal consumption of the product and the pressure of the heat carrier in the casing of the heat exchanger.

Known shell-and-tube reactor, consisting of a housing with a bundle of pipes fixed in the tube sheets, and nozzles for the inlet and outlet of the reaction mass and coolant (ed. St. on the invention SU No. 1088781, IPC B01J 9/00. Shell-and-tube reactor / Golovanchikov AB ., Tyabin N.V., Novak V.V., Puzanova T.F .; applicant, Volgograd Order of the Red Banner of Labor Polytechnic Institute. - No. 3376341 / 23-26; application. 06.01.1982; published on 04.30.1984. . No. 16).

This reactor is also difficult to manufacture and repair. To increase the heat exchange area in this reactor, each tube bundle tube is made of three or more tubes of equal length, the diameter of which increases along the flow of the reaction mass, and the tubes themselves are equipped with annular ribs placed on their outer surface, which leads to an increase in the metal consumption and increases the flow resistance coolant in the annulus, limiting flow. This complicates the use of the reactor for processes occurring with significant effects. In addition, at significant volumetric velocities of the coolant, the appearance of vortices is inevitable, which worsen heat transfer or heat removal.

A known reactor for the catalytic purification of gaseous emissions, containing a number of devices in a cylindrical body, including a tubular heat exchanger, the tubes of which are made inclined and located around the circumferential perimeter of the body, and are also fixed in pipe boards separating the cavity of the body for cleaned and purified gas flows (patent for invention RU No. 2299089, IPC B01D 53/86, F23G 7/06, B01J 19/08 Reactor for the catalytic purification of gaseous emissions / Brazhnikov EB, Panov S.Yu., Turishcheva EN, Duhanina T. N. (RU); applicant and patentoble Atel state institution of higher professional education The Voronezh State Technological Academy (RU) № 2005139076/15;. appl 14.12.2005;... published 20.05.2007 Bulletin number 14)..

Gases passing through the pipes, then between the pipes in this reactor should be twisted due to the inclination of the pipes, increasing the heat exchange between the initial and heated streams.

The disadvantages are the uneven velocity of the gas flows in the central and peripheral parts of the apparatus, as well as the irrational use of the working volume.

Closest to the claimed utility model is a shell-and-tube heat exchanger containing a bundle of swirling pipes fixed in tube sheets (ed. St. Invention SU No. 840662, IPC F28D 7/00, F28F 1/06. Shell-and-tube heat exchanger / Dzyubenko BV, Dreitser G.A., Vilemas Yu.V. et al. - No. 2813148 / 24-06; claimed 23.08.1979; published 23.06.1981. Bull. No. 23).

To enhance the heat exchange of heat-exchanging media in pipes and in the annular space in this heat exchanger, swirling media flows are formed by means of separately manufactured swirling pipes.

The disadvantages are the complexity and non-repairability of the structure, primarily due to the special profile of the pipes used.

The purpose of the claimed utility model is to simplify the design of the heat exchanger, ensuring its maintainability while increasing the effective heat transfer surface of the pipes and enhancing heat transfer due to the swirling of the heat-exchanging media.

This goal is achieved by the fact that in a shell-and-tube heat exchanger containing a bundle of twisted pipes fixed in tube boards, corrugated thin-walled pipes are used, the length of which exceeds the length of the heat exchanger body by an amount that allows the free ends of pipes to be attached to the pipe board, with other pipe ends previously fixed to the tube plate inside the case, and the pipes, when assembled in the heat exchanger case, are twisted on one side by the tube plate until it is connected to the case flange. Stainless steel is used as the pipe material, and pipes are fastened in tube sheets using fittings with clamping nuts.

The essence of the utility model is illustrated in the drawings (Fig. 1 - Fig. 7), where in Fig. 1 shows a General view of the assembled heat exchanger in section; in FIG. 2 shows the option of fixing the corrugated pipe in the fitting; in FIG. Figure 3 shows an option for attaching a corrugated pipe in a fitting to a tube plate; in FIG. 4 shows a General view of the heat exchanger in section before the twisting of pipes; in FIG. 5 is a sectional view of the heat exchanger along AA, in FIG. 6 shows a sectional view of a heat exchanger according to BB, and FIG. 7 is a view of an assembled heat exchanger with a cutout in the housing for illustrating swirl tubes.

The shell-and-tube heat exchanger (Fig. 1, Fig. 4, Fig. 7) contains a cylindrical body 1 with bottoms 2 and 3, nozzles 4 and 5 of the inlet and outlet of the coolant of the pipe space, pipes 6 and 7, respectively, of the input and output of the coolant of the annulus, tube boards 8 and 9, in the holes of which are screwed thin-walled corrugated pipes 10 made of stainless steel (only four pipes are shown for illustration purposes). Pipe boards 8 and 9 are fixed between the flanges of the housing 1 and the bottoms 2 and 3 through the gaskets 11 using bolts 12.

The heat exchanger is assembled in the following sequence. Initially, the ends of the pipes 10 are attached to the fittings 13 (FIG. 2) using standard fastening elements for corrugated stainless pipes (union nuts 14, pressure rings 15, silicone seals 16). Then, the free ends of the fittings (Fig. 3, Fig. 5), through, for example, paronite gaskets 17, are threaded into the holes of the tube plate 9 and fixed with round clamping nuts 18. During assembly, the alignment of the faces of the union nuts 14 shown in FIG. 6, additionally provides reliable connections from spontaneous unwinding.

Pipes 10 with free ends are placed in the housing 1, and the tube board 9 is fixed in the flanges of the housing 1 and the bottom 3 using gaskets 11 and bolts 12 (Fig. 4). The length of the pipes 10 is selected longer than the housing 1 by the amount L (Fig. 4) so that it is possible to easily fix the second ends of the pipes 10 in the tube plate 8 similarly to the tube plate 9.

Next, the tube plate 8 is rotated around its axis together with the pipes 10 until it is connected to the flange of the housing 1 and the mounting holes are aligned. The bottom 2 is mounted on the tube plate 8, and the whole structure is pulled together by bolts 12 (Fig. 1).

In the process of turning the tube plate 8, the tubes 10 are twisted (Fig. 1, Fig. 7), which enhances the heat transfer in the pipes and in the annular space due to the swirling flows of heat-exchanging media.

The use of corrugated stainless pipes with a simultaneous increase in their length significantly increases the effective heat transfer surface in comparison with smooth copper or brass pipes. According to the data from the article “Corrugated stainless steel pipe” (e-mail - Corrugated stainless steel pipe | (domidei.ru> node / 687 ∨), the heat transfer surface of corrugated stainless steel pipes is 40% higher than that of copper pipes of the same diameter and the smaller wall thickness of corrugated stainless pipes compared to copper pipes compensates for the difference in their thermal conductivity.

Corrosion-proof corrugated pipes, in addition, are durable, have increased strength and ductility, and are resistant to corrosion processes. Having a minimum roughness coefficient, they do not overgrow and do not silt, which eliminates the need for periodic cleaning. The design features of corrugated stainless pipes make it possible to compensate for their linear expansion during operation of heat exchangers in a wide temperature range. Corrosion-proof corrugated pipes, in addition, are lighter and cheaper than copper pipes, which favorably affects the overall dimensions and prices of heat exchangers with their use.

This heat exchanger is easy to manufacture and reliable in operation. The design of the heat exchanger allows you to quickly, without the use of special technical means and tools, carry out its assembly, disassembly and repair if necessary.

Claims (3)

1. Shell-and-tube heat exchanger containing a bundle of twisted pipes fixed in tube boards, characterized in that corrugated thin-walled pipes are used, the length of which exceeds the length of the heat exchanger body by an amount that allows the free ends of the pipes to be attached to the pipe plate, with other pipe ends previously fixed to the pipe the board inside the housing, and the pipes during assembly in the heat exchanger housing are twisted on one side by a pipe plate until it is connected to the housing flange. 2. Shell-and-tube heat exchanger according to claim 1, characterized in that stainless steel is used as the pipe material. 3. Shell and tube heat exchanger according to claim 1, characterized in that the fastening of the pipes in the tube plates is carried out using fittings with clamping nuts.

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