Heat exchanger

FIELD: heating.

SUBSTANCE: invention refers to heat engineering and can be used as heat exchanger of nuclear power plant operating in variable load conditions. In heat exchanger containing a bundle of heat exchange zigzag-shaped tubes with external finning in straight sections, which is installed in the housing, spacers arranged between tubes of the bundle so that mixing chambers are formed in the bending area of the latter, the spacers have thickenings in straight tube sections and grooves evenly spaced relative to them so that an individual channel is formed around each tube, which interconnects mixing chambers to each other.

EFFECT: providing forced heat exchange for obtaining small overall dimensions of equipment owing to increasing uniform temperature field in cross section of tube bundle, and decreasing relative tube deformation at thermal elongations.

4 dwg

 

The invention relates to heat-exchange technique and is intended for use as a heat exchanger (THE) nuclear power plant (NPP)operating on liquid metal coolant in the regime of variable loading.

The known heat exchanger, containing a bundle of tubes with transverse walls, the inner and outer housings with openings for inlet and outlet of the coolant and seals, and the inner casing in the form of a spiral wound membrane that covers the beam pipes with baffles and seals installed at the exit of the fluid, while the outer body in the field installation of the seals made with connectors [1].

The disadvantage of this technical solution is low vibration strength design of the heat exchanger and not enough intense heat.

Known shell and tube heat exchanger with corrugated plates in the annular space for the flow direction of the coolant, and the leaves are made with the notches on the tops of the corrugation equal to half of the pipes and adjacent its edges to the surface of the corresponding pipe [2].

The disadvantage of this technical solution is not enough intense heat, which increases the weight / size parameters, low reliability when the process related to the fact that C is e of the contact edges of the cut pipe with a greater likelihood of chafing pipe due to non-uniformity of the temperature field in the cross section of the tube bundle, as well as the vulnerability of the tube plate from the side of the first circuit from thermal shock fluid.

The technical result of the invention - forced heat to get to the small size of the equipment by improving the uniformity of the temperature field in the cross section of the tube bundle and the decline in the relative deformation of the pipe at a temperature movements.

This technical result is achieved in that in a heat exchanger containing mounted in the housing bundle of heat exchange tubes zigzag shape with an outer helical fins on the straights, the spacer plate disposed between the beam pipe with the formation of the mixing chambers in the area of the bending of the latter, according to the invention, the plates are thicker at straight sections of pipe and equidistant to them cutting with education around each of the individual pipes of the channel, indicating the mixing chamber between them.

Summary of the invention is illustrated by drawings, where:

figure 1 shows a longitudinal section of the heat exchanger;

figure 2 - plot of the cross-section;

figure 3 is a longitudinal section of the plate annulus;

figure 4 is a front view of the plate.

The heat exchanger includes a housing 0 with connections input 1 feedwater and output 2 pair, entry 3 liquid metal heat is osites and its output 4, with located inside 0 the bundle of heat exchange tubes 5, distantsioniruyuschih service corrugated plates 6 annulus, and the tubes 5 on the straights have external helical fins 7. Plate 6 are thickening 8 on the straights and equidistant tubes 5 of the recess 9 with the formation around each individual pipe screw channel 10 reported to the mixing chamber 11 formed in the area of the bends of the pipes 5 and plates 6.

The heat exchanger works as follows.

The heat exchange process in the design of the heat exchanger is arranged in counterflow movement of fluids. Liquid metal coolant through the pipe 3, the input signal annulus bundle of heat exchange tubes 5, next, at the expense of some compression ratio bore service corrugated plates 6 annulus, is provided by a hydraulic uniformity of distribution via channels 10 formed helical fins 7 of the tube 5 and plates 6. In the mixing chambers 11 formed by sampling edges 7 at the bends of the pipes 5 and the corresponding removal of the knob 8 in the plate 6, there is a mixture of coolant to avoid razvedki temperature field in the cross section of the entire heat exchanger, which then exits through the outlet 4 outlet redcomet is symbolic of the coolant. Feed water through the pipe 1 input enters the distributing chamber is provided by a hydraulic uniform distribution on heat pipes 5, and then, twisting through-line of the displacer with the changing angle of twist, turns into steam flowing into the collecting chamber, from whence it exits through the nozzle 2 output pair.

The use of a heat exchanger construction of the proposed form will prevent the vibration of the plate pack the annulus in the area of the entrance of the fluid in the process, will improve the intensity of heat and bend heat exchanger tubes and, accordingly, plate carrier due to the presence of the mixing chambers reaches a uniform temperature field in the cross section of the heat exchanger, which will increase the operational reliability of the system as a whole.

Sources of information

1. Naumenko CENTURIES and other heat Exchanger. SU A.S. No. 293490. F28D 7/00. Priority - 16.04.63. Publ. Bulletin of inventions No. 42. 19.09.1973 - equivalent.

2. Weaver GA and other shell and tube heat exchanger. SU A.S. No. 370441. F28D 7/00. Priority - 23.09.68. Publ. Bulletin of inventions No. 11. 15.02.73 prototype.

A heat exchanger containing mounted in the housing bundle of heat exchange tubes zigzag shape with an outer helical fins on the straights, the spacer plate is placed is between the pipes beam with the formation of the mixing chambers in the area of the bending of the latter, characterized in that the plates are thicker at straight sections of pipe and equidistant to them cutting with education around each of the individual pipes of the channel, indicating the mixing chamber between them.



 

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