Direct-flow heat exchange device
SUBSTANCE: invention refers to heating engineering and can be applied in devices for interaction of two heat carriers without direct carrier contact, particularly in steam generators. Direct-flow heat exchange device includes case and concentric tube channels formed by a cylinder made out of straight heat exchange elements of pipe-in-pipe type, where a gap between outer surface and case of obtained cylinder forms heating medium channel connected in sequence with inner cavity of the cylinder and with inner channel of pipe-in-pipe elements comprising the cylinder. Work medium flows in the annular channel of pipe-in-pipe element.
EFFECT: enhanced spatial power density of heat exchanger, simplified design.
The technical field to which the invention relates
The invention relates to a device for implementing the interaction between the two fluids without direct contact and can be used in heat engineering, in particular in steam generators.
The level of technology
Known once-through heat exchangers, which contain concentric tube channels tube type of field's (Fraas A., Ozisik M. Calculation and design of heat exchangers. - M.: Atomizdat, 1971. - 361 p. - P. 275 - 276; Egorov K. S. improving the efficiency of heat exchangers of gas turbine units closed cycle: the dissertation on competition. academic step. Ph. D. Moscow: Bauman. N. Uh.Bauman, 2007. - 17 p.; EN 2307373 C1, 10.02.2006). In these devices the first stream of coolant flows through the inner pipe, turns into a dead end and flows further through the annular ring space. The flow of the second fluid flows around the outer surface of the annulus.
Disadvantages of these devices: the presence of an additional cylindrical tube and the parasitic heat flow through them reduces the volumetric power density, which is equal to the power provided to the unit volume of the device.
Known single pass parallel flow heat exchanger, containing a concentric tubular channels of the type "pipe in pipe", in which the heating �Reda served simultaneously in the annulus and in the inner cavity of the pipe and heats the working environment, which flows in counter-current in the annular cavity of tubular channels (RU 2140608 C1, 13.04.1998).
The disadvantage of this device is the low volumetric energy densities due to the low degree of obtaining energy from the heating medium.
Closest to the proposed solution is a two-way direct-flow heat exchanger, comprising a housing and a concentric tubular channels of the type "pipe in pipe". During the second coolant channels are formed by cylinders made of the heat exchange elements attached to each other side surfaces, which are direct pipe, and the inside of the pipe is moving working environment, and along the surface of the cylinder - the heating medium (RU 2121622 C1, 10.11.1998).
The disadvantages of this device is not sufficiently high energy densities due to the low degree of obtaining thermal energy from the heating medium and the large volume of elements connecting the flows of coolants, as well as the high complexity of the design.
Disclosure of the invention
The object of the invention is to increase the volumetric energonapryazhennosti heat exchanger and simplification of its design.
The task is solved in that, unlike the known solutions, is implementing a three-way heat transfer without substantially increasing device comprising concentric tubular channels t-type�UBA in the pipe". This is achieved by organizing the flow of heating media in the channels formed by the cylinder is made of heat-transfer elements adjacent to each other side surfaces, whereby these elements are the direct elements of type "pipe in pipe", the gap between the cylinder and the housing, and an internal cavity elements "pipe in pipe". The working fluid is moving in a single-pass mode in the annular channels of the elements of "pipe in pipe". The heating medium is gradually moving inside the cylinder, then in the gap between the cylinder and the casing, then inside ring channels "pipe in pipe".
Description of the drawings
Fig.1 shows a cross-section of the device.
The implementation of the invention
The device includes a housing 1, a cylinder 2 formed of heat-exchange elements of "pipe in pipe", channels 3, 4 and 5, formed internal cavity of the cylinder, the clearance between the cylinder and the housing, and an internal cavity elements "pipe in pipe", forming a cylinder, and an annular channel 6.
Adding the third passage of the heating medium along the heat transfer surface with almost the same size, equivalent to an increase of the heat transfer surface by 1.5 times and the same increase of energonapryazhennosti heat exchanger. In the apparatus implemented additional connection channels of heating media that simplify�t design and increases its compactness.
The device operates as follows.
The unit served in the counter-flow through the inlet nozzles, manifolds and tube sheets: working medium in the annular channel 6 and the heating medium into the channel 3. The heating medium sequentially passes through the channels 3, 4 and 5, giving heat to the working medium, which moves along the annular gap 6. Then, the working and the heating medium discharged through the corresponding nozzles. The heat exchanger can be implemented with three or more elements of "pipe in pipe".
The device is implemented by LLC "Bagan" (Novosibirsk) in the small-sized cylindrical steam generator 2 MW weight of 300 kg (1 and 2), which corresponds to energonapryazhennosti above the 6.6 kW/m3. This is 1.6 times higher than the maximum power density achieved to date in small-sized steam boiler MCPUK development JIHT RAS (K. A. Yakimovich gas Turbine power plant for power utility // Electronic journal energy service company "Ecological systems", №2, 2008, Available at:
A parallel flow heat exchanger, comprising a housing and a concentric tubular channels of the type "pipe in pipe" formed of a cylinder made of a heat-transfer elements adjacent to each other side surfaces, wherein the�, that make up the cylinder heat-exchange elements of the heat exchange elements are of type "pipe in pipe", and between the outer surface and the housing created by the cylinder there is a gap that forms the channel of the heating of the environment is connected in series with an internal cavity of the cylinder and an inner channel elements "pipe in pipe", forming a cylinder.
SUBSTANCE: in single-pass shell and tube heat exchanger, comprising a cylindrical housing, fittings for input and output of the coolant, the heat transfer tubes, tubular grids, elliptical flanged lids, fittings for input and output of the coolant, respectively - into the elliptical lid and out of the elliptical lid, the elliptical lid with a fitting for input of the coolant is provided with a perforated circular plate with an free cross-section of from 40 to 60% located in the flanging area of the elliptical lid with the fitting of input of the coolant, and the openings in the perforated circular plate are not more than 1.5 times the diameter of the heat transfer tubes.
EFFECT: uniform distribution of the coolant through the heating tubes, increase in heat transfer coefficient with decreasing the heat transfer surface, reducing overall dimensions, material consumption and cost of the heat exchanger.
SUBSTANCE: invention relates to heat-and-power engineering, chemical and petrochemical industry and is designed for use large-tonnage industrial plants. In the shell-and-tube heat exchanger comprising a body with bottoms, a tube bundle closed at both sides by tube sheets, arranged in the form of a disc with continuous ledges and indents arranged concentrically, in which holes are made to fix the tubes of the tube bundle, any ledge or indent in the cross section have the shape of the right-angled triangle, one side of which is perpendicular to the plane of the tube sheet, and the other one is inclined to it, at the same time holes for fixation of tubes are arranged in the middle of the inclined side, and in the centre of the tube sheet there is a cylindrical ledge with a hole for fixation of the central tube.
EFFECT: expansion of arsenal of technical facilities, increased reliability and resource of operation, reduced material intensity.
5 cl, 5 dwg
SUBSTANCE: invention refers to heat power engineering and can be used at manufacture of tubular heat exchangers. A tubular heat exchanger for heat exchange between two fluid media includes housing (2), inside which one or more tubes (8) for the first fluid medium pass between inlet and outlet chambers (5, 6). The above tubes pass through openings (13) in baffle walls (11) fixed at some distance from each other by means of one or more fasteners. The fastener represents channel (14) fixed by being latched in one or more grooves (19) formed on the corresponding baffle walls (11). According to the invention, the above channel has a V-shape, and groove (19) has a V-shape with projections (23) on two of its opposite edges (22) so that V-channel (14) can be latched by being entering behind those projections.
EFFECT: simpler and lower cost of manufacture and installation of heat exchangers.
8 cl, 5 dwg
FIELD: power industry.
SUBSTANCE: in a shell-and-tube heat exchanger containing identical sections connected to each other, each of which includes a bank of tubes, which is arranged in the shell, at that, the tubes are fixed on opposite ends in tube sheets, and header chambers of tube and inter-tube media with partition walls forming spatial connections between sections and specifying medium flow directions in them, header chambers of the tube and inter-tube media includes the sections, in which partition walls are installed after two or more inlets of media to the sections, thus forming series connected groups of two and more sections with parallel medium flow in each group; at that, in the header chamber of the tube medium there can be installed an additional partition wall before medium inlets to the sections of one of the groups with parallel medium flow.
EFFECT: improving use efficiency of heat energy of a primary source owing to reducing hydraulic losses.
2 cl, 2 dwg
SUBSTANCE: wall is made according to the shape of the door frame. Outer elements of heat transfer are made in the form of supports, holders with cast-in cavities, fixators, door leaf and door handle. Supports are fixed to the outer surface. Holders and the door handle are fixed to another door leaf. Fixators are fixed to supports and partially arranged in cast-in cavities of holders. The door leaf is installed as capable of rotation.
EFFECT: invention makes it possible to expand arsenal of technical facilities.
SUBSTANCE: metal heat exchanger of a room heating system comprises a pipeline with a wall with an outer surface, outer elements of heat transfer and their fixation to the outer surface. The wall is made according to the shape of the door frame. Outer elements of heat transfer are made in the form of supports, holders with cast-in cavities, fixators, door leaf and door handle. Supports are fixed to the outer surface. Holders and the door handle are fixed to the door leaf. Fixators are fixed to supports and partially arranged in cast-in cavities of holders. The door leaf is installed as capable of rotation.
EFFECT: invention makes it possible to expand arsenal of technical facilities.
SUBSTANCE: heat exchanger comprising a bundle of tubes, placed inside a body, made with an elastic end structure put into compressed condition to form a plug, at least partially, on opposite sides of the heat exchange chamber. The specified elastic end structure comprises one or more edge segments stretching between the inner wall of the body and the outer border of the tube bundle. The edge segment includes a combination of materials, having different compression characteristics, providing for reinforced support to edge segments.
EFFECT: improved sealing properties of a heat exchanger.
12 cl, 5 dwg
SUBSTANCE: shell-and-tube heat exchanger includes a tube bank of variable cross section with alternating coaxial cylindrical sections which are equal as to length and have two different diameters, and divergent and convergent conical sections with optimum opening angles of the diffuser and the confuser, which connect them, and headers with tube sheets. Tubes of the bank have opposite periodic sequence of alternation of conical-and-cylindrical sections relative to each other under conditions of their longitudinal and transverse streamlining. Tubes with straight end sections of similar diameter are located in opposite vertexes of a rectangular of breakdown at in-line arrangement or in vertexes at the triangle base of breakdown of tube sheets at in-line arrangement of the tube bank.
EFFECT: improving heat transfer efficiency of tubular surface; reducing the weight and metal consumption at reduction of overall dimensions of the heat exchanger.
FIELD: process engineering.
SUBSTANCE: proposed method comprises stages whereat tubular case is arranged inside synthetic gas cooler to connect set of plates to said case to facilitate steam generation in synthetic gas cooler. At least one first plate with, at least, one length larger than that of second length. Said plate features nonlinear geometry and is inclined to synthetic gas cooler wall. Invention covers also the design of synthetic gas cooler and that of multiple plates therein.
EFFECT: perfected method.
20 cl, 13 dwg
FIELD: power industry.
SUBSTANCE: heat exchanger contains housing having external and internal cylindrical walls connected to each other by means of radial partitions forming through-type chambers with formation of continuous circulation circuit, heat exchange plates located inside the chambers and end covers one of which has an inlet opening and the other one has an outlet opening. Internal wall of the housing is made in the form of central insert with heat exchange element located in it; inlet opening is located coaxially to central insert. Radial partitions and heat exchange plates are fixed by means of inner ends in longitudinal slots made on external surface of central insert, and their outer ends are bent along circular arc and enclosed in the housing; at that, housing is equipped with heat exchange jacket. Radial partitions and heat exchange plates are equipped with longitudinal expansion joints.
EFFECT: heat exchange intensification in heat exchanger at simplification of its manufacture and increase in its operational life at complete use of the whole volume of heat exchanger; enlarging functional capabilities of the device.
2 cl, 5 dwg
SUBSTANCE: invention can be used in heat exchangers of nuclear power plants with Field tubes as part of a steam generating nuclear power plant (NPP) working on liquid metal coolant (LMC) in the mode of variable loads. The heat exchanger tube comprising the inner and outer heat exchange tubes, the outer heat exchange tube is made in two layers, each of which is plugged with the bottom, rigidly connected to the corresponding layer, and the inner part of the bottom is connected to the inner layer of the outer tube by brazing.
EFFECT: simplification of manufacturing technology.
6 cl, 2 dwg
SUBSTANCE: heat exchange device for powder and granular material in compliance with this invention is configured so that at least one of multiple heat exchangers, which shall be located on a shaft, is made as a strong hollow disc-shaped heat exchanger, in which a cut-out cavity is directed from circumferential boundary of the heat exchanger to its centre. Plate-like surfaces spreading from one side edge of the cut-out cavity to the other side edge of the next cut-out cavity are formed into a wedge-shaped plate-like surface. A projection that smoothly projects in a horizontal direction if to look from side is made in the central heat exchanger part; and an opening is made at the projection top, and the heat exchanger is located on the shaft by means of shaft insertion into the opening.
EFFECT: improving operating efficiency of a device and simplifying an assembly process.
6 cl, 15 dwg
FIELD: power engineering.
SUBSTANCE: heat exchange device comprises a heat exchanger with a body and a cylindrical shell, forming channels, input and output headers, an additional heat exchanger, arranged in series with the first one, comprising input and output headers. Besides, inside heat exchangers there is a tubular heat exchanger, comprising input and output headers, arranged between two first heat exchangers, besides, the tubular heat exchanger has uniting input and output headers, connected by pipelines to each other and to input and output headers, besides, inside the tubular heat exchanger there is a cylindrical screen with a fairing, and the output uniting header is connected with the body of the first heat exchanger by pylons, arranged at the angle a to the axis of the heat exchange device. The tubular heat exchanger also comprises a band installed between the uniting headers, and the additional heat exchanger is equipped with a nozzle.
EFFECT: invention makes it possible to increase efficiency of a heat exchange device without increasing its dimensions.
3 cl, 1 dwg
SUBSTANCE: heat exchange unit includes a housing made in the form of a cylinder, on end faces of which plates are fixed. Inside the housing, along its axis there arranged are pipes with gaps between themselves and inner surface of the housing. End faces of pipes and the housing are attached to plates so that tightness is provided. Partition walls are mounted between the pipes in inner cavity of the housing. On external end faces of the plates there installed are cover plates, the cavities of which are separated with a diametrical partition wall into two chambers connected to branch pipes for supply and discharge of heat exchange media. Pipes inside the housing are installed concentrically one into another with formation between them and the wall of the housing of annular cavities for flow of cooled and cooling media alternating between themselves in radial direction. On each plate there are through arc-shaped slots interconnected on one half of end surface with annular cavities for cooling media, and on the other half of the end surface with annular cavities for cooled medium. In each annular cavity there installed are partition walls in the form of spirals forming together with pipe walls the spiral channels for flow of cooled and cooling media, which connect the corresponding arc-shaped slots on opposite plates.
EFFECT: invention allows providing the most effective heat exchange of cooling and cooled media at minimum dimensions of the unit, and improving its processibility.
2 cl, 7 dwg
SUBSTANCE: in a heat exchange pipe that includes a tubular workpiece, on the inner surface of which longitudinal slots are made and on the outer surface of which a hollow core with longitudinal slots is made, fins are inserted on one side into slots of the tubular workpiece, and on the other side into the core slots. Tubular workpiece is oriented relative to the core so that their longitudinal slots can be offset relative to each other through the specified angle α. Fins are made in the form of flat parts; each fin consists of two straight-line components, one of which has a longitudinal pointed end section in the interface zone with the second component provided with a mating wedge-shaped part. Low-melting inserts are arranged in slots of the tubular workpiece and the core. Fin component with the mating wedge-shaped part consists of two symmetrical longitudinal parts. Angle of taper of the longitudinal end section of one fin component is less than aperture angle of the wedge-shaped slot of the second fin component.
EFFECT: increasing safety of the device under conditions of increased temperatures or a fire; reducing manufacturing working hours.
4 cl, 2 dwg
FIELD: power industry.
SUBSTANCE: vortex heat exchange element containing cylindrical heat exchange tubes coaxially located one in the other, in each of which there installed are at least two vortex tubes; at that, one vortex tube is installed at the section inlet, and the other one is installed at the distance between them, which is determined by complete damping of rotational movement of vortex flow at complete heat load, has the packs of ribs on cylindrical pipe of large diameter along external surface in each section determined with complete damping of rotational movement of vortex flow; at that, distance between ribs in each pack decreases. At that, inlet of heat carriers to each of sections of large-diameter pipe and internal pipe is made either on one and the same side, or on opposite sides in relation to flow movement, thus ensuring both counter-flow and direct-flow scheme of heat carrier movement in the element; internal pipe with cylindrical surfaces is made from bimetal; at that, material of internal pipe surface on the side of hot heat carrier has heat conductivity coefficient which is by 2.0-2.5 times more than material of surface of internal pipe on the side of cold heat carrier.
EFFECT: heat exchange intensification is achieved by uniform distribution of heat flow.
SUBSTANCE: invention relates to the field of thermotechnics and can be used in adapters of heat exchange element of type "pipe in pipe" when changing the hydraulic circuit of movement of heat-exchanging fluids of in the heat exchanger of nuclear power (NPP), working on liquid-metal coolant in the mode of variable current sinks. In the adapter, comprising a body in the form of a socket with parallel channels, an edge for connecting pipes, and forming with the last a heat exchanger element of type "pipe in pipe", one of the parallel channels in a cross-section of paths adapter area is made with a square of cross-section equal to area of passage section of each of the pipes joined back to back to the edges of the adapter, the area of the passage section of another parallel channel is equal to the square of cross-section of tubular annulus formed by the inner and outer tubes, at that both parallel channels are aimed at the same angle to the main axis of the heat exchanger element.
EFFECT: design of the proposed adapter enables to increase reliability of work of the heat exchanger element of type "pipe in pipe" on a plot of the phase transition of the heated medium due to changing the hydraulic circuit of heat transfer and, therefore, to exclude the critical values of thermal cycling stresses.
SUBSTANCE: invention relates to the field of thermotechnics and can be used in adapters of heat exchange element of type "pipe in pipe" when changing the hydraulic circuit of movement of heat-exchanging fluids of in the heat exchanger of nuclear power plant (NPP), working on liquid-metal coolant in the mode of variable current sinks. In the adapter containing overflow gaps, axial, radial and circle canals, edges for sealing pipe joints, and forming with the last a heat exchanger element of type "pipe in pipe", the adapter edges are connected with one side to the inner and outer tubes back to back, at that the edge for connecting the inner tube is removed from the adapter relative to the edge to connect the outer pipe so that it forms a chamber transmitted with a tube cavity which is connected back to back to the edge of the adapter on the other side, using the equidistant located overflow gaps, and the radial channels are made flat with a width equal to the diametre of axial channel for connecting the inner tube, and are extended along the axis of the adapter, and are made with an inclination to its axis, and the inner tube cavity through the axial channel of the adapter communicates with the radial ones.
EFFECT: design of the adapter of the proposed type enables to increase reliability of the heat exchanger element of type "pipe in pipe" on a site of the phase transition of the heated medium due to changing the hydraulic circuit of heat transfer and, therefore, to exclude critical values of thermal cycling stresses.
FIELD: power engineering.
SUBSTANCE: method for manufacturing of cooling path in thermally stressed structures consists in production of inner and outer shells by means of turning, arrangement of ribs on outer surface of inner shell and further connection of inner and outer shells along tops of ribs, for instance with the help of soldering, to form cooling channels. On surfaces of ribs that form cooling channels, grooves are arranged in the form of spiral grooves or in the form of part of circumference arc, besides at one side of each rib, arc beginning is arranged near rib base, and at the other side - near its top.
EFFECT: improved conditions of heat and mass transfer.
SUBSTANCE: heat exchanging unit for extraction of heat from gas flow into medium flow, comprising several heat exchangers and structure that embraces them with bottom section, on which they rest by means of support structure. Besides heat exchangers are equipped with substantially gas impermeable wall and are arranged at least partially one into another relative to longitudinal axis of embracing structure so that flow of gas every time passes in space formed by two heat exchangers arranged one inside the other. Support structure comprises surface with holes at least in one of heat exchangers for passage of gas flow from one side of heat exchanger to its other side. By means of heat exchanging block, according to invention, method is realised, in which heat is transferred in the first heat exchanger in direction of organic medium flow in order to cool gas down to its final temperature.
EFFECT: development of method for heating and evaporation of organic medium, in which it is possible to avoid overheating of organic medium, and development of heat exchanging unit suitable for evaporation and heating of organic medium by hot gas, especially by fuel gas produced as a result of biomass combustion.
12 cl, 7 dwg
FIELD: heat power engineering.
SUBSTANCE: according to proposed method, inner pipe is fitted into outer pipe after shape-treatment of at least outer surface of inner pipe or inner surface of outer pipe, and after fitting inner pipe outer pipe, inner pipe is expanded to bring outer surface of inner pipe in tight contact with inner surface of outer pipe, and shape-treatment of surface forms at least one channel to reveal leakage between two pipes. Before fitting in pipes at least outer surface of inner pipe or inner surface of outer pipe is coated with layer of solder, for instance, tin, and inner pipe is expanded so that outer pipe also expands, and solder layer between inner and outer pipes is melted. Outer pipe is expanded so that melted layer of solder is forced out from space between inner and outer pipe at least intone channel to reveal leakage. Such heat exchange pipe contains assembly unit consisting of outer pipe and inner pipe fitted at tight contact in between and at least one channel to reveal leakage passing in contact surface and near the surface between inner and outer pipes. Thin film-like layer of solar material, such as tin, is provided in place of contact between inner and outer pipes which, owing to melting, connects with inner pipe and outer pipe, inner and outer pipes adjoining with displacement. Invention makes it possible to increase heat transfer to value equal to or practically equal to that of solid heat exchange pipe and channel to reveal leakage remains free from filling medium, thus providing accurate and reliable revealing of leakage.
EFFECT: improved reliability.
15 cl, 6 dwg