Vortex heat exchange element

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

 

The invention relates to heat engineering and can be used in heat exchangers used in various fields of engineering, particularly in regenerative heat exchangers for gas turbine installations reactor engineering.

Known heat exchanger element (see RF patent №2084793, IPC F28D 7/10, publ. 1997)containing a coaxially arranged one within the other heat exchanger cylindrical pipe of larger diameter and an inner tube with cylindrical surfaces, with the tube of larger diameter divided into sections, within each of the tubes installed, at least two swirl same or different types, and one swirl at the entrance to the plot, and the second on the distance between them is defined by the full damping rotational motion of the swirling flow at full heat load, in addition, the input of the fluids in each of the sections of pipe of larger diameter and the inner tube is made or with the same hand, or from the opposite sides in relation to traffic flow, providing both counter-current and direct-flow scheme of movement of fluids in the element.

The disadvantage of the invention is the low efficiency of design decisions on the use of vortex method of heat transfer from hot fluid to the cold due to concomitant to this process is teploobmena specific heat, due to the joint impact of on the fence between the coolants thermodynamically stratified boundary layers with a counter direction of heat flow through the thickness of the fence with a thermal capacity greater than the average value of the temperatures of each of the fluids, which leads to the need for additional energy consumption for absorption of heat (cold)allocated cold heat carrier, the heat transferred from the hot fluid.

The technical object of the present invention is to improve the efficiency of the vortex method when transferring heat regenerative heat exchangers, for example, type "pipe in pipe", from hot fluid to cold by performing a fence between them bimetal with significantly different values of thermal conductivity of materials in the direction of heat transfer.

The technical result, providing an intensification of heat transfer is achieved by the fact that the vortex heat exchanger element contains a coaxially arranged one within the other heat exchanger cylindrical pipe of larger diameter and an inner tube with cylindrical surfaces, with the tube of larger diameter divided into sections, within each of the tubes installed, at least two swirl same or different t the surface, one swirl at the entrance to the plot, and the second on the distance between them is defined by the full damping rotational motion of the swirling flow at full heat load, in addition, the input of the fluids in each of the sections of pipe of larger diameter and the inner tube is made or the same side or from opposite sides against the traffic flow, providing both counter-current and direct-flow scheme of movement of fluids in the element, while the inner pipe with cylindrical surfaces made of bimetal, and the surface material of the inner pipe from the hot coolant has a coefficient of thermal conductivity in 2.0-2.5 times higher than the surface material of the inner pipe from the cold fluid.

Figure 1 shows the schematic diagram of the vortex heat exchanger element; figure 2 - typical distribution of specific heat flow from the peripheral hot layers of cold and hot fluids transferred by conduction across the thickness of the inner pipe of the same material; figure 3 is the same as in figure 2, only the thickness of the inner pipe of the bimetal.

Vortex heat exchange element (1) contains a coaxially located with a gap in one of the other heat exchanger tubes 1 and 2. In the pipe 2 the larger the diameter of the swirl 3 is installed on the input section 4 to ensure rotation of the heaviest particles of the medium of the peripheral zone 5 flow of cold fluid (XT), located on the inner surface 6 of the pipe 2 with a larger diameter, is made cylindrical and the outer surface 7 of the inner tube 1 made also cylindrical. Tube 2 consists of two, at least, sections 8 and 9, provided with nozzles cold heat carrier 10 and 11, and the swirl 3 at a distance determined by the value of the total damping of rotational motion of the swirling flow at full heat load of the vortex heat exchanger element are the swirler 12 and 13. In the inner pipe 1 swirl 14 mounted on the inlet section 15, while from him at a distance determined by the value of the total damping of rotational motion of the swirling flow at full heat load of the vortex heat exchanger element, placed second swirler 16. All of the swirler 3, 12, 13, 14, 16, located in the heat transfer tubes 1 and 2, is made or the same or different types. The inner tube 1 with the cylindrical surfaces made of bimetal, and the material of the inner surface 17 by a moving hot fluid has a conductivity of 2.0-2.5 times higher than the material of the outer surface 7 of the inner pipe 1 from the side of the cold heat transfer medium.

Vortex heat exchanger element operates as follows.

In financial p is Tata thermodynamic stratification hot fluid (GT) at the output of the swirler 14 (respectively in the subsequent swirler 16, installed at a certain distance in the direction of GT in the inner pipe 1) is there a bundle on "hot" peripheral and "cold" axial layers (see, for example, Merkulov VP Vortex effect and its application in industry. - Kuibyshev, 1969, 369 C.). Convection heat from the hot layer GT (see figure 1) is transferred to the inner surface 17 of the inner pipe 1 and then by conduction is the heat on the thickness of the material of the inner pipe 1.

Simultaneously XT, passing swirl 3 (and the swirler 12, 13, located at a distance determined by the value of the overall attenuation of each plot 8, 9 of the tube 2 with a larger diameter)inside the pipe 2 has a larger diameter at its output, also splits into "hot" peripheral, located in zone 5, and "cold" axial layers, while the "hot" layer in contact with the outer surface 7 of the inner pipe 1, giving her his heat by convection and then heat conductivity. Flows GT and XT twisted and mixed in the axial direction while and rotational motion. In connection with intensive heat exchange between the rotating stream XT in the pipe 2 and the outer surface 7 of the inner pipe 1 is greater heating of the peripheral layer of XT in zone 5, so that there is an XT with inhomogeneous density field, when the result in continuous substitution of heavy particles XT heavy and this process continues until the decay of the rotational motion of the stream.

As a result, when the execution of the inner pipe 1 of a homogeneous material with constant thermal conductivity observed attenuation of heat transfer from GT to XT (see figure 2) due to the presence in the zone 5 in contact with the outer surface 7, the heat flux coming from the hot layer XT directed deep into the thickness of the inner tube 1. Thus, in the opposite direction of heat flow GT and XT is the quantity of heat transmitted by conduction through the material of the inner pipe 1, is determined by the difference between the quantities of heatandi.e.Thus interaction of heat transferred by conduction and going from peripheral flow GT (), and heat transferred by convection from the zone 5 and then transmitted by conduction from the peripheral hot stream XT (), is approximately on the middle line on the wall thickness of inner tube 1 (see figure 2), since the heat transfer coefficient of the inside wall of the pipe 1 is constant across its thickness. As a consequence, there is considerable heat loss process thermal conductivity across the thickness of the pipe 1, and accordingly, it dramatically reduces the efficiency of the vortex method of heat transfer that causes practical from OUTSTA use in industrial heat exchangers with vortex heat transfer method.

To eliminate this phenomenon, the inner tube 1 is made of bimetal so that the coefficient of thermal conductivity λ1the material of the inner surface 17 of the inner pipe 1 from the side movement of the GT has a value of 2.0-2.5 times higher than the coefficient of thermal conductivity λ2material outer surface 7 of the inner tube 1 from XT motion, while the thickness of each of the constituent materials of the bimetal is of equal value for the wall thickness of the inner pipe 1. The heat from the peripheral hot layer GT is transferred to the inner surface 17 of the inner pipe 1 with convection and further thermal conductivity of the material bimetal with a high coefficient of thermal conductivity and has a higher temperature gradient than the heat transferred from the peripheral flow XT to the outer surface 7 of the inner tube conductive material bimetal low coefficient of thermal conductivity.

In this case, the contact area counter directed heat flow is shifted to the outer surface 7 of the inner pipe 1 and is about 20% of the distance from the outer surface 7 (see figure 3) and this leads to a significant reduction of heat loss due to the direction of heat through the thickness of the inner pipe 1, which significantly improves effectively the th use of the method of heat transfer in recuperative heat exchangers, for example, with the location of the swirler inside the cavity as a pipe 2 with a larger diameter, and inside the inner pipe 1.

The originality of the proposed technical solutions to improve the efficiency of the vortex method of heat transfer from hot fluid to cold fluid in heat exchangers, for example, type "pipe" is achieved by the fact that the decline is inevitable for this method of heat loss due to the counter direction of heat flow from the peripheral layers thermodynamically stratified fluids in heat transfer by conduction cladding (thickness of the inner pipe), by shifting the zone of contact of the opposite and different value of temperature gradients in the direction of a moving cold medium through the inner pipe of the bimetal with the material surface of the hot fluid having a coefficient of thermal conductivity in 2.0-2.5 times higher than thermal conductivity of the material of the surface of the inner pipe from the cold fluid.

Vortex heat exchanger element containing a coaxially arranged one within the other heat exchanger cylindrical pipe of larger diameter and an inner tube with a cylindrical surface, the pipe is great the first diameter is divided into sections, inside each of the tubes installed, at least two swirl same or different types, and one swirl at the entrance to the plot, and the second on the distance between them is defined by the full damping rotational motion of the swirling flow at full heat load, in addition, the input of the fluids in each of the sections of pipe of larger diameter and the inner tube is made or the same side or from opposite sides against the traffic flow, providing both counter-current and direct-flow scheme of movement of fluids in the element, while the inner pipe with cylindrical surfaces made of bimetal, and the surface material of the inner pipe from the hot fluid has a conductivity of 2.0-2.5 times higher than the surface material of the inner pipe from the cold coolant.



 

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