RU2380637C1 - Adapter - Google Patents

Abstract

FIELD: heating systems.

SUBSTANCE: invention can be used as device for arranging hydraulic liquid heating scheme on both sides in high heat stressed heat exchanger working in variable load mode. In adapter rigidly attached to pipes and forming tube-in-tube type heat exchange element in the form of axial sleeve with central hole and two diametrical pairs of channels, central hole is divided as to height into two independent zones, to each of which there connected at an angle to hole axis are channels of one of the pairs; at that, channels of one pair are made with inclination of opposite direction relative to channels of the other pair.

EFFECT: design of the proposed adapter allows obtaining high heat stressed heat exchanger of small sizes.

3 dwg

Description

The invention relates to a heat exchange technique and is intended to be used as an adapter for a heat exchange pipe, when changing the hydraulic circuit of the movement of heat-exchanging liquids, in a heat exchanger (TO) of a nuclear power plant (NPP) operating on a liquid metal coolant in the mode of variable loads.

Known heat exchanger type "pipe in pipe", mainly for viscous liquids with an inner pipe equipped with an external spiral finning, and the outer pipe is made with a varying cross-sectional area, decreasing in the direction of movement of the heated medium in the annulus, and the ribs have a height that increases inversely the step of the ribs in the direction of reducing the cross section of the outer pipe [1].

The disadvantage of this technical solution is the design complexity associated with the technological support of the geometry of the change in the cross-sectional area of the outer pipe together with a change in the finning geometry when reliable vibration resistance of the pipes is achieved relative to each other during operation. Moreover, in order to achieve the corresponding steam production, a sufficiently large number of such heat exchange tubes is required.

Known heat exchange element of the type "pipe in pipe" with an adapter for the media, and the adapter is made in the form of shaped plugs, forming with the outer pipe flow windows for the medium flowing in the annular space between the pipes, and having axial and radial channels connected to the inner pipe and outside the outer pipe [2].

The disadvantage of this technical solution is the presence of a constructive gap in the connection of the shaped plug with the pipe, which can lead to a crack in the welded joint both during welding and when working in conditions of high heat stresses due to the temperature difference between the pipe and the shaped plug. The crack formation process is facilitated by the vibration of the inner pipe. In addition, in a dense bundle of heat exchange elements, reliable entry of the heating coolant into the channel of the inner pipe is difficult.

The technical result of the invention is to increase the reliability of the design of the heat exchanger pipe under conditions of high temperature drops of heat-exchanging liquids and their hydroturbulent parameters during operation.

The specified technical result is achieved by the fact that in the adapter, rigidly joined with the pipes and forming a tube-in-pipe heat exchange element in the form of an axial sleeve with a central hole and two diametrical pairs of channels, the central hole is divided in height into two autonomous zones, to each of which at an angle to the axis of the hole connected channels of one of the pairs, and the channels of one pair are made with an inclination of the opposite direction relative to the channels of the other pair.

The essence of the invention is illustrated by drawings, where:

figure 1 is a top view of a heat transfer pipe with a cross section;

figure 2 is a longitudinal section of a heat transfer pipe along aa;

figure 3 is a longitudinal section of a heat transfer pipe according to BB.

The heat exchange tube contains an adapter in the form of a sleeve 0 with two pairs of adjacent radial channels 1 and 2, 3 and 4 located in mutually perpendicular planes and connected at the same angle with the axial 5 and 6 channels. The sleeve 0 is rigidly attached to the outer pipe 7, and its shanks 8 and 9 are connected, respectively, to the outlet 10 and the inner 11 pipes.

The adapter works as follows.

The heat exchange process in the design of the pipe with the adapter is carried out according to the counterflow scheme. The liquid metal coolant, washing the outlet 10 and the outer 7 pipes, enters two radial channels 1 and 2 into the cavity of the axial 6 channel of the inner 11 pipe. The heated fluid moves along the annular channel between the inner 11 and outer 7 pipes and enters the axial 5 channel of the outlet 10 pipe.

The use of the design of the adapter of the proposed type increases the reliability of the heat transfer pipe in the phase transition phase of the heated fluid by changing the hydraulic circuit of the heat-exchanging fluids, which eliminates the appearance of thermal cyclic stresses of critical values.

Literature

1. Neduzhiy I.A. et al. Pipe-in-pipe heat exchanger. SU. A.S. N 397737. F28D 7/10. Priority - 06/30/71. Publ. Bulletin of inventions N 37. 09/17/1973 - analogue.

2. Zubkov E.T. et al. Heat exchange element. SU. A.S. N 399708. F28D 7/10. Priority - September 16, 71. Publ. Bulletin of inventions N 39. 10/03/1973 - prototype.

Claims (1)

An adapter rigidly docked with the pipes and forming a tube-in-tube heat exchange element in the form of an axial sleeve with a central hole and two diametrical pairs of channels, characterized in that the central hole is divided in height into two autonomous zones, to each of which at an angle to the channels of one of the pairs are connected to the axis of the hole, and the channels of one pair are made with an inclination of the opposite direction relative to the channels of the other pair.

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