SK272019A3 - Heat exchanger with coaxial twisted tubes - Google Patents

Abstract

The heat exchanger with coaxial helically wound tubes is formed by a coaxial tube coil with a helical arrangement of the central tube (7) and the outer tube (6) so that in the annular space (22) of the tube coil the first vortex elements (17) are located along the heat exchange fluid flow. / or in the inner space (21) of the central tube (7) of the tube coil, second vortex elements (16) are arranged along the flow of the heat exchange fluid. The supply part of the central tube (7) connects to the straight section of the fluid supply tube (5) axially guided by the axis of the tube coil so that in the upper initial part of the tube coil the fluid supply tube (5) is curved and forms a transition to the central tube (7). . An axially guided inlet pipe (9) for the supply of heat exchange fluid is connected to the inlet region of the annular space (22) in the lower part of the pipe coil to the outer pipe (6) of the pipe coil and to the outlet region of the annular space (22) in the upper part of the pipe coil to the outer An axially guided outlet pipe (10) is connected to the pipe (6) of the pipe coil to drain the heat exchange fluid. The outlet of the central tube (7) of the tube coil is terminated by a diffuser (8) and / or an outlet tube (4) for draining the fluid.

Description

Technical field

The invention relates to the construction of a heat exchanger with coaxial helically wound tubes. The invention falls into the field of: thermal and nuclear energy, technologies in the chemical and food industries, environmental technologies and environmental treatment technologies such as heating, cooling and air conditioning.

Prior art

Recuperative heat exchangers currently used in technical practice can be divided into tubular heat exchangers in terms of the shape of the walls separating the heat exchange fluids, in which the heat exchange fluids are separated by tube walls and heat exchangers in which the heat exchange fluids are separated by flat walls (planar or curved). The main types of tube heat exchangers include heat exchangers with tube assemblies (tube bundles) which are mounted in flat plates with holes for the tubes (tube tubes), the tube assemblies with tube tubes being structurally enclosed in jackets with heat inlet and outlet ports (heat exchangers). heat exchangers with fixed tube sheets, heat exchangers with floating head, heat exchangers with U-tubes, etc.). Another type of tubular heat exchangers are heat exchangers with helically or helically wound tubes, whereby the tubes can have other cross-sectional shapes in addition to circular. A special type of tubular heat exchangers are tube-in-tube heat exchangers. The main types of heat exchangers in which the heat exchange fluids are separated by flat walls include various design variants of plate heat exchangers and spiral heat exchangers. The active surfaces of the walls, which come into contact with the heat exchange fluids in the heat exchangers, can be variously designed (ribbing, corrugation, grooving, etc.) in order to intensify the heat transfer. These competing types of heat exchangers can usually have certain limitations on their use or operation (pressure loss, thermal efficiency, type of heat exchange fluids used, operating temperatures and pressures, incrustation, etc.). Heat exchangers with coaxial helically wound tubes, which can currently be found in some industrial or other applications, comprise one or more tube coils, these tube coils usually consisting of only two simple helically wound coaxially arranged tubes. The design of such heat exchangers usually does not allow a wider flexibility of qualitative influencing of thermo-hydrodynamic conditions achieved in heat exchange fluids during operation independently in the individual working spaces of the heat exchanger.

These shortcomings provided an opportunity to address this issue by appropriate technical means. The result of this effort is the further described construction of a heat exchanger with coaxial helically wound tubes according to the present invention.

The essence of the invention

The above drawbacks are substantially eliminated by the construction of a heat exchanger with coaxial helically wound tubes according to the invention. It is intended for heat transfer between two heat exchange media (fluids), which are separated from each other by solid walls in the form of coaxially arranged and helically wound pipes (recuperative heat exchanger), while as a whole it represents an original technical solution. It can work reliably even in more extreme operating conditions characterized by high or low temperatures and pressures of heat exchange fluids, or high differences between temperatures and pressures of heat exchange fluids. Coaxially helically wound tubes are the main process element of the heat exchanger and in its basic variant are located inside the casing. In addition to single pipe coils, double and multiple pipe coils, which usually have a common central axis, can be arranged in the housing of the heat exchanger. An alternative variant of the heat exchanger with coaxial helically wound tubes is without an outer jacket. Both variants of the heat exchanger are characterized by the use of vortex elements in the annular spaces and possibly also in the inner spaces of the central tubes of their coaxial tube coils. In a variant of the heat exchanger with an outer jacket, the inner space of the central tube opens into the inner space of the jacket, which outlet can be via a curved diffuser. The outer surfaces of the outer tubes of the coaxial tube coils may be fully or partially ribbed. From the interior of the heat exchanger shell, the heat exchange fluid is discharged through an outlet, which may have an axial, tangential, helical or abbreviated configuration.

The essence of the design of the coaxial helically wound tube heat exchanger according to the invention lies in the arrangement of the coaxial helically wound tube system, which is the main process element of this heat exchanger, inside the rotationally symmetrical shell with optimized geometry and also in the use of first vortex elements also in the use of expensive whirlpool elements in the interior of the central tube of the heat exchanger tube coil. The outlet of the inner space of the central tube into the inner space of the outer shell of the heat exchanger can be through a curved di

S K 27-2019 Α3 fuzzor. The first and second vortex elements, consisting of shape-optimized and suitably arranged lamella systems, cause the generation of intense vortex flow, which in superposition with the primary vortex flow mechanism by centrifugal force acting on heat exchange fluids flowing in curved channels D heat between the heat exchange fluids and the surface of the solid wall and also prevents possible clogging (incrustation) of the working spaces of the heat exchanger. The use (or non-use) and geometry of the curved diffuser allows to achieve suitable hydrodynamic conditions of heat exchange fluid flow in the inner space of the heat exchanger shell in terms of optimizing convective heat transfer between this heat exchange fluid and the outer surface of the outer tube of the heat exchanger tube coil or minimizing pressure loss. heat exchange fluid inside the outer shell of the heat exchanger. The overall design of the heat exchanger with coaxial helically wound tubes allows greater flexibility in independently qualitatively influencing the heat-hydrodynamic stimuli in all three working spaces of the heat exchanger, understood as the inner space of the central tube, inter-ring space, inner space of the heat exchanger outer shell given the heat exchanger fluids and required process properties of the heat exchanger. In this way, the operation of the heat exchanger can be optimized in a more targeted manner.

The advantages of the construction of a heat exchanger with coaxial helically wound tubes according to the invention are evident from the effects which manifest themselves externally. In general, it can be stated that the originality of the presented solution lies in the fact that a suitably structurally and operationally thermo-hydrodynamically optimized new heat exchanger is characterized by a relatively high achieved heat flux density (ratio of heat transfer between heat exchange fluids and heat exchange area) and relatively good thermal efficiency at relatively low values of pressure losses of heat exchange fluids. From the design point of view, it is a relatively compact recuperative heat exchanger, suitable also for high values of temperatures and pressures of heat exchange fluids, characterized by low susceptibility to clogging, i. encrustation. The low susceptibility to clogging, incrustation of the heat exchanger results from the nature of the flow of heat exchange fluids in the exchanger. The new heat exchanger synergistically uses some of the operational or design advantages of other types of heat exchangers, as a result of which the declared favorable operating parameters can be achieved. The above attributes of the new heat exchanger point to specific possibilities of its industrial use. The described solution of the heat exchanger with coaxial helically wound tubes allows greater flexibility in independent qualitative influencing of thermal-hydrodynamic conditions in individual working spaces of the heat exchanger, which results in a wider possibility of targeted optimization of its operation. The heat exchanger is characterized by a relatively compact design. The basic design variant of the heat exchanger includes a set of coaxial helically wound tubes, which is housed in a rotating symmetrical shell with hydrodynamic and strength optimized geometry. Achieved process thermal-hydrodynamic parameters of heat exchanger t. j. heat transfer coefficient between heat exchange fluids, pressure loss of heat exchange fluids, thermal efficiency, etc. due to its relatively compact configuration, they also predestine it for efficient application in systems in which natural passive circulation of one or both heat exchange fluids is required.

Overview of figures in the drawings

The construction of a heat exchanger with coaxial helically wound tubes according to the invention will be shown in more detail in the drawings, where in fig. 1 shows a heat exchanger with coaxial helically wound tubes as a variant with an outer shell. FIG. 2 shows the tangential outlet of the fluid from the interior of the heat exchanger shell. In FIG. 3 shows a helical fluid outlet from the interior of the heat exchanger shell. In FIG. 4 shows an abbreviated fluid outlet from the interior of the heat exchanger shell. In FIG. 5 shows a heat exchanger with coaxial helically wound tubes as a variant without an outer shell.

Examples of embodiments of the invention

It is to be understood that the individual embodiments of the invention are presented by way of illustration and not by way of limitation of the technical solutions. Those skilled in the art will find, or be able to ascertain using no more than routine experimentation, many equivalents to specific embodiments of the invention. Such equivalents will also fall within the scope of the following claims. For those skilled in the art, it cannot be a problem of optimal design, so these features have not been addressed in detail.

S K 27-2019 Α3

Example 1

In this example of a specific embodiment of the subject of the invention, a basic construction variant of a heat exchanger with coaxial helically wound tubes is described, which is shown in FIG. 1 and which is intended for heat transfer (exchange) between two heat exchange media (fluids), which are separated from each other by solid walls in the form of coaxially arranged and helically wound tubes (recuperative heat exchanger), while as a whole it represents an original technical solution. It can work reliably even in more extreme operating conditions characterized by high or low temperatures and pressures of heat exchange fluids, or high differences between temperatures and pressures of heat exchange fluids. Coaxially helically wound tubes are the main process element of the heat exchanger and in its basic variant are located inside the casing.

The main components of the basic design of a heat exchanger with coaxial helically wound tubes are the outer jacket and a set of two coaxially arranged tubes which are helically wound and located inside the heat exchanger jacket, the tube coil and outer jacket having a common axis of symmetry. The geometric dimensions of the pipes (diameters, wall thicknesses, length), the geometry of the pipe coil (diameter, pitch and number of threads) and the main dimensions of the outer jacket are directly related to process conditions (operating temperatures and pressures, heat output, heat exchange media used, heat-dynamic conditions operation, etc.) operation of the heat exchanger and the construction materials used.

The outer casing is formed by a cylindrical part 1 of the casing, a conical part 2 of the casing and an arched part 3 of the casing. In the lower conical part 2 of the shell there is an inter-circular axially symmetrical opening 20, the axis of symmetry of which is identical with the axis of the shell of the heat exchanger. Through the annular axially symmetrical opening 20, the inner space of the heat exchanger shell opens into the fluid discharge pipe 4. The outer surface of the heat exchanger shell and the outer surface of the fluid drain pipe 4 may be thermally insulated. The set of helically wound pipes (pipe coil) consists of a central pipe 7 with a constant cross-section and of an outer pipe 6, which is coaxially arranged with the central pipe 7. The supply part of the central tube 7 enters the inner space of the exchanger shell from below through an annular axially symmetrical opening 20 as a straight section of a separate fluid supply tube 5, forming a coaxial configuration with the fluid drain pipe 4 and also with the rotationally symmetrical heat exchanger jacket. In the upper part of the inner space of the casing, the fluid supply pipe 5 is curved so that this curvature creates a geometrically simple and hydrodynamically optimized transition to the initial part of the pipe coil. The initial part of the pipe coil (at least half of one thread of the pipe coil) is formed only by a separate pipe 5 for the supply of fluid. The initial part of the pipe coil is followed by a set of two coaxial helically wound pipes forming a helical pipe coil with a preferably counterclockwise helical character. This main part of the pipe coil is the most important process element of the heat exchanger. The central tube 7 in the main part of the tube coil extends coaxially inside the outer tube 6. The annular space 22 defined by the outer surface of the central tube 7 and the inner surface of the outer tube 6 is on the end faces, i. beginning and end of the annular space, impermeable closed. The inlet and outlet openings for the supply and discharge of the heat exchange fluid to the annular space 22 are located on the circumference of the outer tube 6 in the initial and end regions of this space, the geometric configuration of the inlet i. an assembly of an inlet pipe 9 and an outer pipe 6 of the pipe coil in the inlet region of the annular space 22, and the outlet i. the system of the outlet pipe 10 and the outer pipe 6 of the pipe coil in the outlet region of the annular space 22 is hydrodynamically optimized. The heat exchange fluid has an inlet 13 to the annular space 22 via an inlet pipe 9 and has an outlet 14 from the annular space 22 via an outlet pipe 10. The inlet pipe 9 and the outlet pipe 10 open through the outer shell of the neck-shaped heat exchanger. In the case where the inlet pipe 9 and the outlet pipe 10 firmly connect the heat exchanger assembly as a pipe coil to the supply central pipe, with its outer jacket, it is necessary to consider compensating for the different thermal expansion of the building and the outer jacket in a particular design for a particular operating application. For this purpose, the helical shape of the tube coil of the heat exchanger can also be suitably used in combination with the optimized geometric configuration of the parts of the inlet pipe 9 and the outlet pipe 10 in the interior of the exchanger. In the annular space 22 of the tube coil of the heat exchanger, first vortex elements 17 are arranged along the heat exchange fluid flow, consisting of shape-optimized and suitably arranged lamella systems, which cause the generation of an intense vortex flow. The number of installed first vortex elements 17 is influenced by the total length of the annular space 22 and the required hydrodynamics of the flow of the heat exchange fluid in this space. The first vortex elements 17 also define the geometry of the annulus, i. rotational symmetry along the axis of the annulus, along the coiled coaxial tubes, and must be positioned so that their relative position along the coiled coaxial tubes does not prevent differential expansion between the central tube 7 and the outer tube 6 in their coaxial arrangement at non-stationary heat exchange states. commissioning, decommissioning, etc. In the inner space 21 of the central tube 7 of the tube coil, second vortex elements 16 for a similar purpose can also be arranged along the flow of the heat exchange fluid, i. adjust the hydrodynamic flow rates of the heat exchange fluid by generating an intense vortex flow. Behind the main part of the tube coil of the heat exchanger, formed by a system of two coaxial ones

With K 27-2019 Α3 helically wound pipes, a curved diffuser 8 with a circular cross-section of the flow channel is connected to the central pipe 7, the geometric shape of which is optimally hydrodynamically optimized by the apex angle of the curved conical surface defining the widening of the circular cross-section. The abbreviated axis of the divergent i. of the expanding flow channel of the curved diffuser 8 has the same diameter and pitch as the common axis of the flow channels in an assembly of two coaxially helically wound outer tube 6 and a central tube 7 forming the main part of the heat exchanger tube coil. The curved diffuser 8 may not be used in every heat exchanger application. Its use depends on the specific requirements for the thermal-hydrodynamic parameters of the operation of a given heat exchanger.

The function of the heat exchanger with coaxial helically wound tubes is as follows. The hot heat exchange fluid 11 i. the heat exchange fluid to be cooled in the heat exchanger flows from below through the fluid supply pipe 5 into the inner space of the heat exchanger and further flows upwards in a straight section of the fluid supply pipe 5 into the upper part of the inner space of the heat exchanger. In the inner part of the interior of the heat exchanger, the flow of hot heat exchange fluid 11 through the helically wound section of the central tube 7 continues downwards, cooling by means of cooling heat exchange fluid 13 flowing in the annular space 22 of the helically wound coaxial outer tube 6 and the central tube 7. . As the heat exchange fluids flow through the helically wound section of the coaxial outer tube 6 and the central 7, a vortex pattern of the flow of the cooled heat exchange fluid 11 in the central tube 7 and the cooling heat exchange fluid 13 is generated in the annular space 22 of the helical tube coil. The vortex nature of the flow is characterized in addition to the primary components of the flow rate of the fluid in the direction of its main flow t. j. in the direction of the axis of helically wound coaxial tubes, which has the shape of a helix, also by secondary components of the fluid flow rate in the direction perpendicular to its main flow. The described vortex flow is generated on the one hand by the effect of the centrifugal force acting on the heat exchange fluids flowing in the curved channels formed by the inner space 21 of the central tube 7 and the annular space 22 defined by the outer tube 6 and the central tube 7. Dean's beliefs. However, the vortex flow of the heat exchange fluids can be generated in the inner space 21 of the central tube 7 and in the annular space 22 of the helical tube coil also by the first and second vortex elements 17 and 16, in which case both vortex flow generating mechanisms are superimposed. The first and expensive vortex elements 17 and 16 are shape-optimized and suitably arranged lamella systems which can be repeatedly placed in the working spaces along the flow of heat exchange fluids. In order to achieve an optimal superposition effect while simultaneously generating vortex flow in curved channels by the two described mechanisms, it is necessary to optimize the geometric configuration of the curved channels, i. helically wound coaxial heat exchanger tubes, including the geometric shape and arrangement of the first and second vortex elements 17 and 16 with respect to the process conditions of operation of the heat exchanger. The cooled fluid flows out of the inner space 21 of the central tube 7 through a curved diffuser 8 into the inner space of the outer shell of the heat exchanger, flowing upwards in the central region 18 of helically wound tubes and in the edge region 19 between the outer circumference of helically wound tubes and inner tube. housing part 1 and the conical part 2 of the heat exchanger housing in descending order. The described flow in the spaces of the central region 18 of helically wound tubes and the peripheral region 19 of the heat exchanger is generated by a suitable geometric configuration of its outer shell in said method of outlet 15 of cooled fluid from inside 21 of the central tube 7 through a curved diffuser 8. At such flow a secondary heat transfer through the wall occurs. of the outer tube 6 between the cooled fluid inside the outer shell of the heat exchanger and the cooling fluid flowing in the annular space 22 of the helically wound coaxial tubes. To intensify the heat transfer on the outer surface of the outer helically wound tube 6, this surface can be ribbed in whole or in part. In order for the described secondary heat transfer to contribute to increasing the efficiency of the heat exchanger, it is necessary to optimize its design and operation with respect to the physicochemical properties and operating conditions (temperature, pressure, flow rate) of the used heat exchange fluids. In certain cases, under the given operating conditions, the described secondary heat transfer in the heat exchanger could reduce its efficiency. This can occur, for example, if the temperature of the outlet stream 14 of the cooling resp. of the heating heat exchange fluid will be higher than the temperature at the outlet 15 of the cooled heat exchange fluid from the curved diffuser 8 to the inside of the outer shell of the exchanger. In this case, with unsuitable hydrodynamic flow rates of the cooled heat exchanger fluid inside the outer shell of the heat exchanger (relatively high kinetic energy of the cooled heat exchanger fluid flowing out of the curved diffuser 8), partial secondary heating of the cooled heat exchanger fluid in the upper outer space space could occur. This unfavorable phenomenon can be suppressed not only by optimizing the hydrodynamic flow rates of the heat exchange fluid inside the outer shell of the heat exchanger, but also by insulating a part of the outer surface of the outer helically wound tube 6 or by not removing this part of the outer surface through which said undesired heat transfer could occur. The cooled heat exchange fluid has an outlet 12 from the inner space of the outer shell of the heat exchanger through an opening 20 into an axially symmetrical annular space 23 defined by an elongated direct

With K 27-2019 Α3 part of the tube 5 for fluid supply and the tube 4 for fluid drainage. In the case where the stream of cooled heat exchange fluid (outlet 12) from the heat exchanger has a relatively larger tangential velocity component, i. characterized by a relatively higher kinetic energy, suitably shaped lamellae can be installed at the beginning of the annular space 23 in order to transform with maximum efficiency the dynamic pressure corresponding to the tangential component of the cooled fluid flow rate to static pressure, as a result of which the total static pressure in the cooled heat exchange fluid increases at the outlet 12 of the heat exchanger. In this way, the total pressure loss caused by the flow of the cooling heat exchange fluid in the heat exchanger can be reduced. Workspaces i.e. the inner space 21 of the central tube 7 and the annular space 22 of the helical tube coil, of the cooled and heated heat exchange fluid in the heat exchanger can be exchanged, i.e. contrary to the case described above, i. The heated heat exchange fluid can flow through the inner space 21 of the central tube 7 of the helical tube coil of the heat exchanger, and the cooled heat exchange fluid can flow through the intermediate ring 22. The design of the heat exchanger must be partially adapted to this, especially in cases where natural (passive) circulation of one or both heat exchange fluids in the system in which the heat exchanger will be used will be required. Also, the relative orientation of the main heat exchange fluid streams can be supercurrent, in contrast to the case shown in FIG. 1 and FIG. 3, where it is countercurrent.

Example 2

The basic design variant of the heat exchanger with coaxial helically wound tubes located inside the outer shell described in Example 1 and shown in FIG. 1 may also have alternative constructional or process arrangements. In FIG. Figures 2 to 4 show alternative constructional solutions for the outlet of the heat exchange fluid from the interior of the heat exchanger shell. In contrast to the axial outlet 12 of the heat exchange fluid, in the case shown in FIG. 2 outlet pipe 4 tangentially connected to the lower conical part 2 of the outer shell of the heat exchanger. In this case, it is a tangential outlet 12 of the heat exchange fluid from the interior of the heat exchanger shell. The straight part of the fluid supply pipe 5 is guided through a cap 24 in the lower conical part 2 of the outer shell of the heat exchanger. The connection of the outlet channel to the lower conical part of the outer shell of the heat exchanger may also have a helical arrangement as shown in FIG. 3 or a helical arrangement as shown in FIG. 4.

Example 3

In this example of a specific embodiment of the invention, an alternative construction variant of a heat exchanger with coaxial helically wound tubes without an outer jacket is described, which is shown in FIG. 5. In this case, the coaxially helically wound tubes are not located in the outer casing, but form a separate structural unit, the central tube 7 of the tube coil having a straight part of the heat exchange fluid supply pipe 5 and the heat exchange fluid discharge pipe 4 terminated by necks, similar to in the case of the design of the inlet pipe 9 and the outlet pipe 10 for the heat exchange fluid flowing through the annular space 22 of the heat exchanger. The first and second vortex elements 17 and 16 are arranged in the annular space 22 of the heat exchanger tube coil and possibly also in the inner space 21 of its central tube 7, similarly to the design variant of the heat exchanger with outer shell. Heat transfer between heat exchange fluids in a system of two coaxially helically wound tubes occur exclusively through the wall of the central tube 7. Heat exchange between the heat exchanger fluid flowing in the annular space 22 of the heat exchanger and the surrounding environment can take place via the wall of the outer tube 6, the outer surface of the outer tube 6 being edged due to heat intensification. In the case of a requirement to prevent heat transfer between the heat exchange fluid flowing in the annular space 22 of the heat exchanger and the surrounding environment, there will be an insulating layer on the outer surface of the outer tube 6 of the heat exchanger.

Design clarifications. The described design variants of the heat exchanger with coaxial helically wound tubes can contain, in addition to single tube coils, also double and multiple tube coils, which usually have a common central axis. From a process point of view, double and multiple pipe coils can be connected in parallel, in series or in combination. The aim of such an arrangement of tube coils is to increase the heat exchange area and, with regard to the used heat exchange fluids, to achieve suitable process (thermal hydrodynamic) conditions in the working spaces of the heat exchanger while increasing the compactness of the heat exchanger design. In terms of the hydrodynamics of the flow of heat exchange fluids, the heat exchanger with coaxial helically wound tubes is characterized by a forced vortex flow: in the inner space 21 of the central tube 7 as well as in the annulus 22, between the outer surface of the central tube 7 and the inner surface of the outer tube 6. favorably affects the convective heat transfer between the heat transfer fluids and the surface of the solid wall (central tube surfaces, inner surface of the outer tube). Intensive vortex flow of heat exchange fluids also prevents possible clogging, incrustation of the working spaces of the heat exchanger.

S K 27-2019 Α3

Industrial applicability

The industrial applicability of the construction of a heat exchanger with coaxial helically wound tubes according to the invention finds application in thermal and nuclear energy, in industrial technologies of the chemical and food industry, in environmental technologies, in environmental treatment technologies such as heating, cooling and air conditioning.

S K 27-2019 Α3

List of reference marks

- cylindrical part of the casing

- conical part of the casing

- arched mantle lid

- fluid drain oven

- fluid supply oven

- outer oven

- central oven

- diffuser

- entrance hall

- outlet pipe

- entry of cooled fluid into the central tube

- the outlet of the cooled fluid from the inner space of the casing

- coolant supply to the annular space

- coolant drainage from the annular space

- outflow of cooled heat exchange fluid

- the second vortex element

- the first vortex element

- central area of helically wound pipes

- peripheral area

- annular axially symmetrical hole

- internal space - central tube

- annular space

- axially symmetric annular space

- a cap in the lower conical part of the casing

Claims (7)

PATENT CLAIMS Heat exchanger with coaxial helically wound tubes, characterized in that it is formed by a coaxial tube coil with a helical arrangement of the central tube (7) and the outer tube (6) such that in the inter-circular space (22) of the tube coil there are heat exchangers along the flow. The first vortex elements (17) and / or in the inner space (21) of the central tube (7) of the tube coil are arranged along the heat exchange fluid, the second vortex elements (16), the supply part of the central tube (7) adjoining a straight section of the tube. (5) for the supply of fluid axially guided by the axis of the tubular coil such that in the upper initial part of the tubular coil, the tube (5) for the supply of fluid is curved and forms a transition to the central tube (7); an axially guided inlet pipe (9) for the supply of heat exchange fluid is connected to the inlet region of the annular space (22) in the lower part of the pipe coil to the outer pipe (6) of the pipe coil and to the outlet region of the annular space (22) in the upper part of the pipe coil to the outer an axially guided outlet pipe (10) for draining the heat exchange fluid is connected to the tube (6) of the tube coil; the outlet of the central pipe (7) of the pipe coil is terminated by a diffuser (8) and / or an outlet pipe (4) for draining the fluid. Heat exchanger with coaxial helically wound tubes according to claim 1, characterized in that the tube coil with the helical arrangement of the central tube (7) and the outer tube (6) is arranged in an outer casing which is formed by a cylindrical casing part (1). a conical part (2) of the casing and an arched lid (3) of the casing. Heat exchanger with coaxial helically wound tubes according to Claim 1, characterized in that the first vortex elements (17) and / or the second vortex elements (16) are formed by a system of fins. Heat exchanger with coaxial helically wound tubes according to claim 1 to 3, characterized in that the outlet pipe (4) for draining the fluid is guided axially from the lower region of the conical part (2) of the housing so that the inlet pipe (5) for fluid supply they form an axially symmetrical annular space (23). Heat exchanger with coaxial helically wound tubes according to claim 1 to 3, characterized in that the outlet pipe (4) for draining the fluid has a helical outlet from the conical part (2) of the casing. Heat exchanger with coaxial helically wound tubes according to claim 1 to 3, characterized in that the fluid outlet outlet (4) has a helical outlet from the conical part (2) of the casing. Heat exchanger with coaxial helically wound tubes according to claim 1 to 3, characterized in that the outlet pipe (4) for draining the fluid has a tangential outlet from the cones of the housing part (2).