Heat exchanger

FIELD: heating systems.

SUBSTANCE: invention refers to heat exchange equipment and is intended for being used as heat exchanger of nuclear power plant operating in variable load mode. In heat exchanger containing the housing with bank of heat exchange tubes, which is located inside it, exchange tubes are fixed in tube sheets, and bank of parallel located corrugated plates in tubular volume, two opposite walls of the housing are corrugated and parallel to bank of plates, and two other ones are flat; each tube is also bent as per plate profile, located between them and equipped outside in straight sections with screw-shaped ribs with changing swirl angle, and inside - with band with swirl direction opposite relative to ribs; at that, in tubular volume there arranged are ejectors which are made in the form of rods fixed in additional tube sheets and located equally spaced.

EFFECT: increasing heat exchange intensity owing to uniformity of temperature field in cross section of heat exchange tube bank, improving operating reliability owing to decrease of relative deformation of tubes at thermal linear expansions.

3 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.

A known heat exchanger containing tubes with transverse fins in the form of plates, provided with corrugations arranged at an angle to the flow of the working fluid, and the corrugations have a rectangular shape with a height equal to 0.18-0.6mm width, and adjacent plates are angled. [2].

The disadvantage of this technical solution is not as intense heat, which increases the weight / size parameters, low reliability due to the large non-uniformity of the temperature field in the cross section of rubeho beam, as well as the vulnerability of the tube plate from the side of the first circuit from thermal shock fluid and different relative deformation adjacent annular rows of heat exchange tubes at a temperature movements, which can lead to chafing heat transfer tubes.

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, comprising a housing with an interior of the bundle of heat exchange tubes, fixed in the tube plate, and a package of parallel corrugated plates in the annular volume, two opposite walls of the case is made corrugated parallel to the plate pack and the other two are flat, each tube is also bent on the profile of the plates, placed between them and provided outside on the straights spiral ribs with changing angle of twist, and the inside of the tape opposite to the ribs with the direction of the twist, while in the annular volume equidistant tubes placed plungers in the form of rods fixed in additional tube plates.

Set out the essential substance of the th of the invention is illustrated by drawings, where:

figure 1 shows a longitudinal section of the heat exchanger;

figure 2 - heat pipe heat exchanger;

figure 3 is a plot of the cross-section.

The heat exchanger includes a housing 0, inlet pipe 1 and the distributing chamber 2 feed water, a bundle of heat transfer tubes 3, passing through the package of corrugated plates 4 annular volume of the collecting chamber 5 and the outlet 6 pair, inlet and outlet pipes 7, 8 for the liquid metal coolant, the top and bottom tube sheets 9, 10, in-line displacer in the form of a tape 11 and spiral ribs 12 located on the outer surface of the zigzag of the heat transfer tubes 3 and the displacers in the form of rods 13, fortified additional tube plates 9, 10.

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 7 of the input signal in the annular volume of the evaporative section of the bundle of heat exchanger tubes 3, where the tube sheet is protected from the direct flow of coolant top tube Board 9, in which the reinforced tube ends of the plungers in the form of rods 13, further at the expense of some compression ratio bore service corrugated plates 4 mitr the service volume is provided by a hydraulic uniformity of distribution channels package corrugated plates 4 tube volume. Spiral fins 12 of the heat transfer tubes 3 with the changing angle of twist and the opposite corner of the twist-pipe displacer in the form of a tape 11 contribute to the static mixing of the coolant and the heat transfer coefficient increase from the first path. In the mixing chambers formed by sampling spiral ribs 12 at the locations of the bends of the heat transfer tubes 3, there is a mixture of coolant. Channel package corrugated plates 4 annular volume of the coolant enters the economizer section of the bundle of heat exchange tubes 3 and then exits through the outlet 8. The bottom tube sheet 10 protects from heat stroke liquid-metal coolant pipe Board, and in it fasten the other ends of the tube of the plungers in the form of rods 13. Feed water through the pipe 1 enters the distributing chamber 2, which is provided by a hydraulic uniform distribution on the heat transfer tubes 3, and then, twisting through-line of the displacer in the form of a tape 11 with the changing angle of twist, turns into steam flowing into the collecting chamber 5, where it exits through the outlet 6.

The use of a heat exchanger construction type of the proposed will significantly improve the heat exchange rate, the uniformity of the temperature field in the cross with the treatment of the tube bundle, as well as the operational reliability by reducing the relative deformation of the tubes in the heat of linear extensions.

Link

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

2. Averkiev L.A. and other heat Exchanger. SU. A.c. N 937953, F28D 7/00. Priority - 14.10.80. Publ. Bulletin of inventions N 23. 23.06.82 prototype.

A heat exchanger comprising a housing with an interior of the bundle of heat exchange tubes, fixed in the tube plate, and a package of parallel corrugated plates in the annular volume, characterized in that two opposite walls of the case is made corrugated parallel to the plate pack and the other two are flat, each tube is also bent on the profile of the plates, placed between them and provided outside on the straights spiral ribs with changing angle of twist, and the inside of the tape opposite to the ribs with the direction of the twist, while in the annular volume equidistant tubes placed plungers in the form of rods fixed in the additional tube plates.



 

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Heat exchanger // 2378593

FIELD: heating systems.

SUBSTANCE: invention refers to heat exchange equipment and can be used in water treatment system of nuclear power plant. Heat exchange contains housing with heat exchange liquid inlet and outlet connection pipes, bank of V-shaped heat exchange tubes fixed in tube sheet comprising together with cover by means of a partition two chambers along the path of one of the liquids; at that, straight sections of V-shaped heat exchange tubes are put with a gap to the tubes the ends of which are rigidly fixed in separate tube sheets, and bent sections are placed in the cavity comprised with tube sheet and bottom; at that, this cavity is interconnected by means of tubular gaps with cavity and connection pipe to it, and isolated from paths of heat exchange liquids.

EFFECT: design with proposed layout of tube bank will allow obtaining small scale heat exchangers meeting the requirements of reliability, manufacturability, erection at high specific thermal stresses of the occupied volume of nuclear power plant.

2 dwg

FIELD: heating systems.

SUBSTANCE: invention refers to heat engineering and can be used in heat exchangers used in various industries, namely in regenerative heat exchangers of gas turbine plants of nuclear reactor industry. Invention consists in the fact that vortex heat exchange element includes heat exchange cylindrical tubes of large diametre located coaxially one inside the other and internal tube with cylindrical surfaces; at that, tube of large diametre is divided into sections, inside each tube there installed are at least two swirlers of the same or various type; at that, one swirler - at the section inlet, and the other one - at some distance between them, which is determined by damping of rotary movement of vortex flow at complete heat loads. Besides inlet of heat carriers to each section of tube of large diametre and internal tube is made either on one and the same side or on opposite sides in relation to flow movement, thus providing both counterflow and direct-flow scheme of heat carriers movement in element, at that, internal tube with cylindrical surfaces is made from bimetal; at that, material of internal tube surface from the side of hot heat carrier has thermal conductivity factor which is 2.0-2.5 times higher than material of internal tube surface from the side of refrigerating heat carrier.

EFFECT: improving use efficiency of vortex method of heat transfer in heat exchange devices.

3 dwg

FIELD: food industry.

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7 dwg, 6 ex

FIELD: heating systems.

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EFFECT: improving heat exchange characteristics owing to improved resistance to metal dusting and to corrosion damage.

2 cl, 3 dwg

FIELD: heating systems.

SUBSTANCE: invention refers to physical and chemical process technology, namely to process and reactor for performing heat exchange reaction. Heat exchange reaction performing process involves reagent flow supplied to catalytic material layer, which is located for example outside one heat transfer tube with double walls in heat exchange reactor, contact of reagent flow to catalytic material at indirect heat exchange with medium-heat carrier available in annular volume of at least one heat transfer tube with double walls; at that, in annular volume there installed is one or more bracing elements forming spiral flow path of medium-heat carrier around internal heat exchange tube at least of one heat exchange tube with double walls. Invention also includes heat exchange reactor for carrying out the above reaction.

EFFECT: improving heat transfer at carrying out heat exchange reaction.

10 cl, 13 dwg

FIELD: heating.

SUBSTANCE: invention is of relevance for operation of apparatus for air cooling of gas and is to be utilised in power engineering industry. The proposed method of the heat exchanger apparatus fabrication envisages the following activities: fabrication of finned heat exchange tubes, a framework, at least a single apparatus section with lateral walls and beams joining them together, gas inlet and outlet chambers; packing the section with a bundle of finned one-way-flow heat exchange tubes; fabrication of a manifold for gas supply and removal, a support structure and their assembly. The section walls are represented by channel bars with shelves turned towards the tubes and are equipped with fairing displacers forming the U-bar reinforcement ribs. One of the methods of the apparatus heat exchanger section fabrication envisages positioning an optimal number of tubes within the section in accordance with the dependence specified within the framework of the invention concept. An alternative method envisages assembly of the section elements on a holding frame designed within the framework of the invention concept. A third method envisages assembly of the elements in a specific sequence combined with performance of hydraulic pressure testing. The method of fabrication of the apparatus chamber for gas inlet or outlet envisages manufacture of the chamber elements and their assembly in a sequence developed within the framework of the invention concept. The method of fabrication of the gas delivery and removal manifold envisages manufacture of the manifold body sections and their assembly with the help of the tool tab designed within the framework of the invention concept. Method of hydraulic pressure testing of the apparatus sections envisages mounting the section to be tested on the hydraulic test bench designed within the framework of the invention concept with the pressure increase and drop modes as per the dependence given. Method of the manifold hydraulic pressure testing envisages it being mounted on the hydraulic test bench or a loft with the help of support structures designed within the framework of the invention concept.

EFFECT: enhanced effectiveness and precision of assembly of the apparatus and elements thereof combined with reduction of labour and material consumption, reduction of hydraulic losses occurring in the apparatus as well as technological simplification of the hydraulic pressure testing of heat exchanger sections and manifolds of the apparatus for air cooling of gas, improved effectiveness and reduced labour intensity of their performance.

25 cl, 30 dwg

FIELD: heating.

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1 dwg

FIELD: heat-and-mass transfer.

SUBSTANCE: invention relates to devices designed to cool fluids and distributor thereof, as well as to methods of clearing and sterilising such apparatuses. Proposed device comprises primary heat exchanger, secondary heat exchanger, 1st pipeline for fluid to be cooled to circulate therein. It comprises heat carrier to transfer cooling power to fluid to be cooled that circulates in the 1st pipeline. Note here that aforesaid primary and secondary heat exchangers are arranged, at least, partially, one into another. Note also that primary heat exchanger comprises the 2nd pipeline that passes together with secondary heat exchanger 1st pipeline and around it and along, at least, a portion of the length of aforesaid pipeline. The proposed device additionally comprises fluid source and, at least, one distributor valve. Note here that the said distributor incorporates a cooler implemented in compliance with one of the described versions. Proposed method of sterilising cooled fluid comprises the steps that follows, i.e. draining fluid from the chamber with primary heat exchanger heat carrier, or draining fluid from the 2nd pipeline carrying primary heat exchanger hear carrier, draining fluid from the 1st pipeline that carries fluid to be cooled and distributed, sterilising the 1st pipeline during the period sufficient for killing bacteria and sterilising.

EFFECT: higher efficiency and simpler servicing.

53 cl, 4 dwg

FIELD: mechanics.

SUBSTANCE: invention relates to "pipe-in-pipe"-type heat exchangers and can be used in various industrial branches. The proposed heat exchanger comprises an inner pipe with external cylindrical ribs representing hollow pipes and turbulator mounted thereon and representing a helical tape coiled on the rod, a tangential branch pipe to feed intertubular medium and that to discharge aforesaid medium. Note here that straight cylindrical ribs, arranged all long the heat exchanger length, are fitted on the inner pipe outer surface with the help of bent metal plates and brought out into common branch pipes of feeding and discharging inner pipe medium via tube plates.

EFFECT: simplified mounting/dismantling, intensified heat exchange, reduced costs of clearing pipes.

2 dwg

FIELD: mechanics.

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3 cl, 2 dwg

FIELD: heat power engineering.

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EFFECT: improved reliability.

15 cl, 6 dwg

FIELD: heat power engineering, applicable in designing and production of heat exchangers with tube plates and in other branches of industry.

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EFFECT: idle time, enhanced utilization factor of the heat exchanger, as well as enhanced strength of the structure in static and especially dynamic modes of operation.

5 dwg

FIELD: baking industry.

SUBSTANCE: proposed plant includes trap hood and heat exchange cooling unit connected with it and mounted under it; cooling unit includes jacket with pipe line located over its center. Heat exchange cooling unit is used for forced circulation of cold air between jacket and pipe line inside it directing the flow in required direction: in cold season outside air is delivered and at hot season air from floor areas is delivered.

EFFECT: simplified construction; enhanced ecology; saving of water.

1 dwg

FIELD: boiler installation technology.

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EFFECT: reduced size and weight of boiler installation, steam boiler and heat exchanger.

18 cl, 13 dwg

FIELD: heat-exchange apparatus.

SUBSTANCE: air cooler comprises vortex heat exchangers, pipes of the vortex heat exchangers for flowing air to be cooled flows, swirlers, and actuator of purifying mechanisms. The actuator has hollow driving shaft mounted in the pipes and provided with a longitudinal groove throughout its length. The groove receives unmovable screw with a nut coupled with the bushing freely mounted on the shaft through a key. The brush holder with brushes are secured to the bushing. The outer side of the pipes of the vortex heat exchangers are provided with chutes for circulating a coolant. The vortex heat exchangers has a fining with a coefficient that varies according to the relationship where D is the diameter of the pipe, n is the number of chutes, and l is the chute width. The parameters vary in the following range: D = 50-800 mm and l = 20-50 mm. The chute height l1 =3-40 mm, the thickness of the pipe wall and the thickness of the chute wall

EFFECT: simplified structure and enhanced reliability.

5 cl, 7 dwg

FIELD: power engineering.

SUBSTANCE: heat exchanger comprises pipes with spiral-ring fins. The fins are provided with longitudinal slots. The pipes in the heat exchanger are arranged vertically.

EFFECT: enhanced efficiency.

3 dwg

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EFFECT: improved accessibility of check points and reduced time of heat-exchanger putting of operation.

3 cl, 3 dwg

FIELD: heat exchange.

SUBSTANCE: heat exchanger comprises housing with front and back supporting lags of different height, lens compensator, pipe bundle with branch pipes for supplying and discharging heat-transfer agent, and front water chamber with the baffle which divides the pipe bundle into two sections. One of the sections is provided with branch pipes for supplying and discharging fluid to be heated, and the other section defines the back water chamber. The lens compensator is mounted in the vicinity of the back water chamber, and back supporting lag of the housing is provided with the additional supporting unit and mounted on the housing upstream or downstream of the lens compensator.

EFFECT: improved heat exchange and enhanced reliability.

1 dwg

FIELD: heat exchange.

SUBSTANCE: heat exchanger comprises housing with front and back supporting lags of different height, lens compensator, pipe bundle with branch pipes for supplying and discharging heat-transfer agent, and front water chamber with the baffle which divides the pipe bundle into two sections. One of the sections is provided with branch pipes for supplying and discharging fluid to be heated, and the other section defines the back water chamber. The lens compensator is mounted in the vicinity of the back water chamber, and back supporting lag of the housing is provided with the additional supporting unit and mounted on the housing upstream or downstream of the lens compensator.

EFFECT: improved heat exchange and enhanced reliability.

1 dwg

FIELD: heat exchange apparatus.

SUBSTANCE: surface heat exchanger comprises casing provided with bearing lags, lens compensator, pipe bench with branch pipes for supplying and discharging heat-transfer agent, and front water chamber with the baffle that divides it into two sections. One of the sections is provided with the branch pipes for supplying and discharging of the fluid to be heated, and the other section defines the back water chamber. The pipe bench inside the housing is separated by the horizontal baffle provided with the by-pass port interposed between the lens compensator and back water chamber. The top and bottom sections of the pipe bench are separated with the vertical baffles arranged symmetrically to each other.

EFFECT: improved heat exchange and enhanced heat power and reliability.

1 dwg

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