SU1654628A1 - Heat exchanger - Google Patents

Abstract

The invention relates to heat exchange apparatus, m. used in devices for the gasification of cryogenic liquid. The purpose of the invention is the intensification of heat and mass transfer when using cryogenic liquid with intra tube boiling as the working medium. Heat exchange tubes for circulating the working medium are connected to the inlet and outlet headers 1 and 3 and are made in the form of flat spiral coils 2 installed in parallel with a gap between them. The coils of the coils 2 have a radial gap between them. The coils 2 are provided with external fins in the form of wire spirals wound on heat exchange tubes with a pitch whose value depends on the diameters of the spirals and wire of these spirals, and the gaps S between the coils and their turns are D0p SS 2D0p, where Dop is the outer diameter of the pipes with fins. The cryogenic fluid passes through the pipes of the coils 2, due to the design it is heated from atmospheric air and converted into gas. 4 il. k

Description

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The invention relates to a heat exchange apparatus, in particular to devices for the gasification of a cryogenic liquid.

The purpose of the invention is the intensification of heat and mass transfer when using cryogenic liquid with intra tube boiling as the working medium.

FIG. 1 schematically shows the proposed heat exchanger; in fig. 2 is a view A of FIG. one; in fig. 3 - a pipe with a wire coil having a pitch equal to the diameter of the coils; in fig. 4 - a pipe with a wire spiral having a pitch that is smaller than the diameter of the spirals by one or two diameters of the wire of these spirals.

The heat exchanger consists of a pipe collector 1 of a cryogenic liquid inlet, flat parallel-mounted coils 2, a pipe collector 3 of a gasified product outlet. Each coil 2 consists of a pipe 4 on which a wire coil 5 is wound. The coils of the coil 2 are installed with a radial gap, the outer coils being pressed together. Such a design can be carried out due to the fact that two or three outer turns are relatively warm. The wire spirals 5 are wound on pipes 4 with a step, the value of which is determined by the inequality

dcn- (1-2) dnp t dcn, where t is the pitch of the wire spirals 5;

dnp is the wire diameter of these spirals;

den is the diameter of the spirals 5, and the gaps between the coils 2 and their turns can be made in the distribution of Dop S 2D0p, where S is the gaps between the coils 2 and their turns, D0p is the outer

the diameter of the heat exchange tubes 4 together with the fins of the wire spirals S

The heat exchanger operates as follows.

The cryogenic fluid is supplied to the pipe collector 1 and passes through the pipes of the coils 2, heated from atmospheric air due to the presence of the coils 2 in a space with the required clearance,

turns into gas, then goes to the pipe collector 3 of the outlet gasified product.

Claims (1)

Invention Formula A heat exchanger containing heat exchanger tubes connected to the inlet and outlet headers for circulation of the working medium, which are made in the form of flat spiral coils installed in parallel with a gap between them, the internal coils of which have a radial gap between them, in order to intensify heat and mass transfer, when using cryogenic liquid with internal pipe boiling as the working medium, the coils are equipped with external fins in the form of wire spirals wound on heat exchange pipes with a step whose value is determined by the inequality dcn- (1-2) dnp t dcn. where t is the pitch of the wire spirals; dnp is the wire diameter of these spirals; den is the diameter of the spirals. and the outer turns of each coil are pressed together. Type A Fig.Z FIG. C