RU169293U1 - TUBULAR HEAT EXCHANGE UNIT - Google Patents

Abstract

The utility model relates to heat exchangers and can be used in energy, utilities and related industries. The objective of the utility model is to achieve high heat transfer efficiency, reduce the metal consumption of the tubular heat exchanger, as well as temperature deformations in the tubes of the apparatus and the possibility of using the tubular heat exchanger in a wide range of temperature differences in the tube bundles of the tubular heat exchanger, the technical result is achieved by the fact that the tubular The heat exchanger is made of non-rigid construction without a casing. The advantage of the proposed tubular heat exchanger is the ability to reduce temperature deformations when the tube bundles elongate under the influence of temperature independently of each other.

Description

The utility model relates to heat exchangers and can be used in energy, utilities and related industries.

Known tubular heat exchanger containing tube sheets, in which tube bundles are fixed, forming heat exchange elements such as pipe in pipe, while the tubular heat exchanger is made of a non-rigid structure without a casing (see JP 2005127684 A from 05.19.2005, authors Yasuro Suzuki, Masahisa Venishi )

In such a heat exchanger, complete compensation of temperature deformations in the pipes is excluded due to the possibility of elongation of the pipes under the influence of temperature, regardless of each other's temperature due to the absence of two floating heads in its design, providing a non-rigid structure.

Closest to the proposed technical solution is a shell-and-tube heat exchanger containing a housing, tube sheets with tube bundles fixed therein, forming tube-in-tube heat exchangers, while the outer pipes are fixed in additional tube sheets installed in the housing between the tube sheets of the inner pipes (see Utility Model Patent No. 127438 of 04/27/13, Bull. No. 13) - a prototype.

According to the description of the principle of operation of the prototype, this design of the heat exchanger has disadvantages, which are expressed in partial compensation of temperature deformations due to the installation of one floating head from the side of the heated medium (water) (see the description of item 15). This does not provide the required compensation for temperature deformations between tube bundles, especially from the steam side, since apparatuses for the steam-water system often operate at a temperature difference equal to or greater than 50 ... 100 ° C.

The objective of the utility model is to create high heat transfer efficiency in a tubular heat exchanger; decrease in metal consumption of the tubular heat exchanger; the exclusion of temperature deformations in a wide range of temperature differences in the tubes of tube bundles forming tube-in-tube heat exchange elements.

The technical result is achieved by the fact that in the tubular heat exchanger the lower tube sheets of the tube bundles are closed with covers with the formation of two floating heads, forming a non-rigid structure.

In FIG. 1 shows a tubular heat exchanger, in which the lower tube sheets of the tube bundles are closed with covers to form two floating heads, forming a non-rigid structure.

In FIG. 2 - node A, containing tube sheets, in which tube bundles are fixed, forming tube-in-tube heat exchange elements.

A distinctive feature of the proposed tubular heat exchanger is the ability, independently from each other, to freely extend the tube bundle tubes under the influence of temperature, since the lower tube gratings of the tube bundles are closed by covers with the formation of two floating heads, forming a non-rigid structure.

The tubular heat exchanger 1 consists of tube bundles 2 and 3. The tube bundle tubes are mounted concentrically relative to each other and form tube-in-tube heat exchanger elements 4. The tube bundle tube 2 (larger diameter) is fixed in the tube sheets 5, and the tube bundle tubes 3 (smaller diameter) are installed in the tube sheets 6. Above the upper tube sheet 5 of the tube bundle 2, a chamber 7 is mounted for uniform distribution of the heat agent in the tube bundle 2 tubes, equipped with a pipe 8 for supplying steam. The lower tube sheet 5 of the tube bundle 2 is closed by a cover 9 and is equipped with a pipe 10 for draining the condensate. Thus, one of the lower tube sheets 5 of the tube bundle 2, closed by a cover 9, forms a floating head. The lower tube sheet 6, in which the tube bundles 3 are fixed, is closed by a cover 11, also represents a floating head.

As a result, the tubular heat exchanger equipped with lower tube sheets, in which tube bundles are fixed, closed by covers with the formation of two floating heads, provide the device with a non-rigid structure.

A cover 12 is attached to the upper tube sheet 6, which is divided by a partition 13 into sections I and II and equipped with nozzles 14 and 15 for the input and output of the heat agent (cold and hot water).

The tubular heat exchanger operates as follows. With a single mixed flow of coolants, cold water through the pipe 14 of section II in the cover 12 enters the tubular heat exchanger 1 and then moves through the pipes of the tube bundle 3 installed in the tube sheets 6.

At the same time, saturated water vapor is supplied through the pipe 8 of the chamber 7, which, moving along the annular annular space of the tube-in-pipe heat exchange elements 4 of the tube bundles 2 and 3, heats the water in the tubes of the tube bundle 3 and then through the cover 12 and the tube 15 of section I in the form of hot water is removed from the heat exchanger 1.

The advantage of the proposed tubular heat exchanger is tube bundles forming tube-in-tube heat-exchange elements, where, at small cross sections of the tube and annular spaces of the heat-exchange elements, even at low flow rates of the medium, fairly high heat carrier velocities are achieved (1 ... 1.5 m / from).

This makes it possible to obtain higher heat transfer coefficients and achieve higher thermal loads per unit mass of the apparatus than in shell-and-tube heat exchangers. In addition, with an increase in the speed of the coolants, the possibility of deposition of contaminants on the heat exchange surface decreases.

In a tubular heat exchanger made with lower tube sheets, where tube bundles closed by covers with the formation of two floating heads, forming a non-rigid structure, prevent:

- firstly, (regardless of the temperature of each other) significant deformation in the pipes as a result of their elongation;

- secondly, it eliminates the possibility of a violation of the density of the connection of the pipe bundles of pipes with tube sheets due to the destruction of welds in places of their contact with the tube sheets;

- thirdly, unacceptable mixing of heat-exchanging media in the event of pipe destruction from temperature deformations is excluded.

The design of the proposed tubular heat exchanger provides significant metal savings compared with the metal consumption of the known shell-and-tube heat exchangers.

Claims (1)

A tubular heat exchanger containing tube sheets, in which tube bundles are fixed, forming tube-in-pipe heat exchange elements, characterized in that the lower tube sheets of the tube bundles are closed with covers to form two floating heads, forming a non-rigid structure.

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