Shell-and-tube heat exchanger (options)

 

The invention is intended for use in the field of power engineering and other industries, and it can be used in the design and development of heat exchangers and tube sheets. The invention according to the first variant implementation includes a distribution chamber separated by a partition on the input and output cavities and limited housing with a pipe inlet-outlet of the heated medium and one or more tube sheets with holes for the connection of heat-exchange tubes, and attached to the tubular lattice exchanger casing covering the bundle of heat exchanger tubes, pipes for supplying and discharging a heating medium, tubular grille is made hemispherical convex towards the environment with less pressure, non-perforated part of the tube is made with the tab for connecting the casing of the heat exchanger, and a protrusion formed in the annular recess. The invention according to the second variant implementation includes a distribution chamber separated by a partition on the input and output cavities and limited housing with a pipe inlet-outlet of the heated medium and one or more tube sheets with holes for connection talaandig tubes, with pipes for supplying and discharging a heating medium, pipe fence, designed hemispherical convex towards the environment with less pressure, non-perforated part of the tube, is made with the tab for connecting the casing of the heat exchanger, and a ledge formed annular recess, a distribution chamber from the heated environment is made in the form of a sphere. The invention allows to reduce the thickness and weight of the tube 1.5-1.8 times, the depth of drilling a single hole, the total length of all holes and the mass of broken metal in 1.3-1.6 times, reduce labor costs for drilling, and to increase reliability in dynamic modes, and also allows distribution chamber more lightweight and compact, to reduce the dimensions and weight of the heat exchanger. 2 S. p. f-crystals, 2 Il.

The invention relates to the field of power engineering and can be used in the design and development of heat exchangers and tube sheets in other industries.

Known shell-and-tube heat exchangers, including a distribution chamber with input and exhaust the heated environment. Distributing chamber divided by a partition into input and output of prosterity under heat-exchange tubes. For the tight connection of these tubes resultsbecause and/or welded to the tube sheet holes. Distributing chamber and tube sheets may be placed above, below or in the middle of the casing, and the heat exchanger can be vertical or horizontal [1 - "Heat exchangers, steam turbines. Part II. Directory 8-78. Createitems. M., 1978, page 137; 2 - Miller C. W. Heutiger Stand der Auslegung und Fertigung von Worwarmern//VGB Kraftwerkstechnik 64. Heft 11, November 1984. 982-989; 3 - Mitterecker E. und Kallenberg H. Speisewasser-worwrmanlagen Grosser Dampfkraftwerke. Vorwarmer//BWK. Bd. 37. 1985, 10. 388-396; 4 - Marushkin C. M., Ivashchenko S. C., Vakulenko B. F. high pressure Heater steam-turbine power plants and nuclear power plants. M, Atomenergomash, 1985; 5 - Vakulenko B. F., Zheleznyakov N. And. New design LDPE for NPP with VVER-1000//power station. 1990, 7, 46-51; 6 - Transactions of the ASME. April 1994, 434-441; 7 - Vrbsky J. Condensers and feedwater heater surface type//Proceedings of 10-th Conference on Steam and Gas Tur-bine. 1994, 347-352; 8 - Vakulenko B. F. some new constructive solutions of essential components of HDPE and LDPE//Electric station, 1999, 6; 9 - Heaters low and high pressure. Information sheet. JSC JV "Podolsk machine-building plant". Podolsk, 1995; 10 - Kalimullin Meters Meters and other RF Patent 216932 the rigid are large thickness (for example, up to 500-800 mm in the high pressure heaters turbines with a capacity of 500 MW and pressure of steam more than 24 MPa) and the weight of such tube sheets, the large depth of the holes with a small step of holes, a large amount of broken metal, sophisticated technology and the complexity of their manufacture.

Also known shell-and-tube heat exchanger, comprising a distribution chamber with input and exhaust the heated environment. Distributing chamber divided by a partition into input and output cavity and limited housing with hoses and flat tube sheet. Tubular grille has a large number of holes of the heat exchange tube. For the tight connection of these tubes resultsbecause and/or welded to the tube sheet holes. Distributing chamber and tube sheets may be placed above, below or in the middle of the casing, and the heat exchanger can be vertical or horizontal.

For weight reduction of the entire distribution chamber is applied in this location of the camera body in the center of the heat exchanger and the connection of two conventional flat tube sheets into a single distribution chamber through a wall of the camera housing with pipe inlet-outlet nagrevaemi at one edge of the heat exchanger ["Heat exchangers, steam turbines. Part II. Directory 8-78. Createitems. M., 1978, page 137].

A disadvantage of the known heat exchanger, taken as a prototype, is that the flat tube and the wall of the distribution chamber have a large thickness (for example, in tube sheets up to 500-800 mm, and in the walls of the distribution chamber up to 250 mm in the high pressure heaters turbines with a capacity of 500 MW and pressure of steam more than 24 MPa) and the weight of such tube sheets, the large depth of the holes with a small step of holes, a large amount of broken metal, sophisticated technology and the complexity of their manufacture.

In this regard, the use of the known device is possible at low pressures heated environments. For example, for a turbine NPP with VVER-1000 reactors at pressures heated water up to 12 MPa were produced and operated high pressure heaters type MF-2000-120. For higher pressures the heated water in excess of 24 MPa arise technological and operational challenges of large thickness of the flat tube sheets.

The inventive design allows to reduce the thickness and weight of the tube 1.5-1.8 times, the depth of drilling a single hole, the total length of all holes and a lot of the drilled metal is more lightweight and compact, to reduce the dimensions and weight of the heat exchanger as a whole and to reduce labour costs for drilling, and to improve reliability by reducing thermal stresses in dynamic modes (starts, stops, resets loads).

Proposed shell-and-tube heat exchanger (option 1), including distribution chamber separated by a partition on the input and output cavities and limited housing with a pipe inlet-outlet of the heated medium and one or more tube sheets with holes for the connection of heat-exchange tubes, and attached to the tubular lattice exchanger casing covering the bundle of heat exchanger tubes, pipes for supplying and discharging a heating medium, and tubular grille is made hemispherical convex towards the environment with less pressure, non-perforated part of the tube is made with the tab for connecting the casing of the heat exchanger, and a protrusion formed in the annular recess.

Proposed shell-and-tube heat exchanger (option 2), including distribution chamber separated by a partition on the input and output cavities and limited housing with a pipe inlet-outlet of the heated medium and one or more tube sheets is nice, covering the bundle of heat exchanger tubes, pipes for supplying and discharging a heating medium, pipe fence, designed hemispherical convex towards the environment with less pressure, non-perforated part of the tube, is made with the tab for connecting the casing of the heat exchanger, and a protrusion formed in the annular recess, and distributing chamber from the heated environment is made in the form of a sphere.

The invention is illustrated in the drawings, in which figure 1 shows option 1, and figure 2 - option 2.

Shell-and-tube heat exchanger (option 1) includes a distribution chamber 1 divided by a partition 2 to input 3 and output 4 cavity, and a limited housing 5 with the nozzle inlet 6 and outlet 7 of the heated medium and a hemispherical tube sheet 8, and attached to the pipe grate casing 9 of the heat exchanger with the nozzle inlet 10 and outlet 11 of a heating medium. In the perforated portion 12 of the tube 8 holes 13 for connecting the heat exchange tubes 14 is parallel to the Central axis 15 of the hemispherical tube 8. Non-perforated portion 16 of the tube 8 has a protrusion 17 formed annular recess 18 for connecting the casing 9 of the heat exchanger. When avariant 2) includes a distribution chamber 1, divided by a partition 2 to input 3 and output 4 cavity, and a limited housing 5 with the nozzle inlet 6 and outlet 7 of the heated medium and a hemispherical tube sheet 8, and attached to the pipe grate casing 9 of the heat exchanger with the nozzle inlet 10 and outlet 11 of a heating medium. In the perforated portion 12 of the tube 8 holes 13 for connecting the heat exchange tubes 14 is parallel to the Central axis 15 of the hemispherical tube 8. Non-perforated portion 16 of the tube 8 has a protrusion 17 formed annular recess 18 for connecting the casing 9 of the heat exchanger with the distributing chamber 1 is made in the form of a sphere.

Shell-and-tube heat exchanger according to options 1 and 2 operates as follows. Heated high-pressure medium is fed into the input cavity 3 distribution chamber 1 through the supply pipe 3, where through holes 13 in the hemispherical pipe lattice 8 is distributed over the heat exchange tubes 14. Flowing inside the tubes medium heated by the heating medium that flows into the tube space of the casing 9 through the pipe 10 and out of the casing through the pipe 11. Of the tubes 14 of the heated medium through the tubular bars 5 enters the collecting Palpatine

1. Shell-and-tube heat exchanger (option 1), including distribution chamber separated by a partition on the input and output cavities and limited housing with a pipe inlet-outlet of the heated medium and one or more tube sheets with holes for the connection of heat-exchange tubes, and attached to the tubular lattice exchanger casing covering the bundle of heat exchanger tubes, pipes for supplying and discharging a heating medium, characterized in that the tubular lattice is made hemispherical convex towards the environment with less pressure, non-perforated part of the tube is made with the tab for connecting the casing of the heat exchanger, and a protrusion formed in the annular recess.

2. Shell-and-tube heat exchanger (option 2), including distribution chamber separated by a partition on the input and output cavities and limited housing with a pipe inlet-outlet of the heated medium and one or more tube sheets with holes for the connection of heat-exchange tubes, and attached to the tubular lattice exchanger casing covering the bundle of heat exchanger tubes, pipes for supplying and discharging a heating medium, tubular lattice, issue the weave made with the tab for connecting the casing of the heat exchanger, and a protrusion formed in the annular recess, wherein the distributing chamber from the heated environment is made in the form of a sphere.

 

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SUBSTANCE: proposed heat exchanger has cellular partitions made from bimetal in form of diffusers and contractions; provision is made for cleaning heat-transfer agent from drop-shaped contaminants. Heat accumulating properties of heat exchanger are enhanced due to thermal equilibrium and reduction of aerodynamic resistance which is achieved due to availability of rotor in form of disks secured on shaft in housing with sealing partitions located in between them; said sealing partitions form cavities which are filled with porous material; cellular partitions are made in form of contractions and diffusers located in staggered order relative tot adjacent cells. Partitions are made from bimetal and porous material is used as heat accumulating and absorbing medium.

EFFECT: enhanced heat accumulating properties of heat exchanger.

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