SU964408A1 - Heat exchanger - Google Patents

Description

(54) HEAT EXCHANGER

The invention relates to heat-sensitive devices of the contact type and can be used predominantly in power plants during various technological processes.

Heat exchangers are known, such as a pipe in a pipe, containing a series of concentric pipes fitted at the ends with krysik between which concentric intermediate shells are installed, installed with a gap relative to the rails, and the gaps between the pipes are connected to camshafts with the formation of zigzag circulation circuits for working media connected to autonomous nozzles for inlet and outlet of media tl.

This heat exchanger is three-circuit using intermediate coolant and heat exchange in it is carried out under countercurrent conditions and forced circulation of coolants; however, it cannot be used for working with soiled heat-transfer agents, and soils deposited on the walls significantly reduce the heat transfer coefficient and require part of the heat exchanger stops for cleaning the surfaces of the heat exchanger. A heat exchanger is known that contains a vertical casing with lower and upper grilles fitted with branch pipes for supplying and discharging working media, central and peripheral shells coaxially placed inside the casing, mounted with clearance 10 relative to the lids and connected to one another with an annular partition located above the lower lid, while the partition is equipped with a choke, and the central 15 nike is equipped with a distribution grid connected to the supply pipe 23K to the disadvantages of the known heat exchanger 20 uet include tettloobmena unsatisfactory rate due to the inability to maintain a stable and optimum mode dispersed sredy flows

Claims (2)

25 counterflow conditions, significant losses of heat into the environment, associated with a large area of contact of the surfaces of the heat exchange system with this medium, as well as the need for additional energy | ia forced circulation of one of the working media. The purpose of the invention is to intensify heat transfer and increase reliability when using aggressive media. The goal is achieved by the fact that, in a heat exchanger containing a vertical body with lower and upper lids, equipped with supply and discharge branch pipes, coaxially located inside the body, the central and peripheral shells are installed with a gap relative to the doors and are connected to each other with an annular partition, with this partition is equipped with a fitting, and the central shell - with a distribution grid connected to the supply pipeline; an intermediate shell with a decisive shell is installed between both gulls mended formed as a ring located beneath the top lid above the annular gap between the intermediate and the peripheral shells. The drawing shows the proposed heat exchanger. The heat exchanger contains a vertical body 1, an upper 2 and a lower 3 covers, a nozzle 4 for supplying working media, a nozzle 5 for withdrawing one of the working media, a central shell 6, a peripheral shell 7, an annular partition 8 provided with fitting 9 for removal of one of the working media, distribution grid 10 connected to supply pipe 11, intermediate shell 12 with grid 13 installed above the ring clearance 14. The heat exchanger works as follows. 1 The one of the working media (water) through the pipe 11 is supplied to the distribution grid 10, dispersed and transferred to the central shell b, where it gives off heat to another medium (oil), with which it goes down. At the bottom cover 3, the working media are separated, one of which (water) is discharged through the pipe 5, and the other (oil), rushing up the gap between the housing 1 and the peripheral shell 7, enters the annular gap 14, into which Through the pipe 4, the regiment 13 is supplied and water is dispersed (the same working medium as on the distribution grid 10, but with a temperature lower than that of the working environment, is fed to the grid 10). In the gap 14, the water takes heat from the oil, goes down with it, then, after separation on the partition 8, is discharged through fitting 9, and the oil / then the gap between the central 6 and intermediate 12 shells rushes up and the end of the central shell 6 enters the internal cavity . Thus, the contact heat exchange between the working media is repeated continuously. Replenishment of circulation circuits with oil is carried out through pipes 4 and pipeline-11. The main advantage of the proposed heat exchanger is the natural circulation of one of the working media under conditions of flow of the media, which leads to automatic control of the flow regimes of the working media and the achievement of their laminar movement, which provides the best conditions for contact heat exchange. The total surface contact with the environment in the proposed heat exchanger is 272.5 times less than that of the known ones, which reduces the heat loss by the same amount. Claims of the invention: Heat exchanger, contents vertical casing with lower and upper lids, equipped with supply and discharge branch pipes of working media, coaxially placed inside the casing central and peripheral shells, installed with a gap relative to the lids and connected to each other annular partition located above the Yizhny lid with This partition is provided with a choke, and the central shell - with a distribution grid connected to the supply pipeline, characterized in that, for the purpose of intensification heat transfer and increased reliability when using aggresive media, an intermediate shell is installed between the shells with a grill made in the form of a ring located under the top cover above the annular gap between the intermediate and peripheral shells. Sources of information taken into account in the examination 1. US Patent 2870997, cl. 165-141, published. 1959. 2.Patent France 2162607, class B 01 D 3/00, published. 1973.