Heat exchange unit

FIELD: power industry.

SUBSTANCE: heat exchange unit contains housing in the form of flattened cone with heads; inlet and outlet branch pipes of heat carriers to tube and inter-tube space, tube sheets in the holes of which there fixed along concentrical circles and inclined to axis of the units are tubes in the form of flattened cones, vertical central pipe for location of thermocouples; at that, tubes in the form of flattened cone have simultaneous inclination relative to the unit axis and in the direction about the unit axis.

EFFECT: improving heat exchange intensity at low metal consumption.

3 cl, 3 dwg

 

tesoreria relates to a power system, to heat exchange apparatus and can be applied in the energy, chemical, petrochemical and other industries, when carrying out heterogeneous catalytic oxidation, dehydrogenation, and other processes.

Known shell-and-tube heat exchanger containing a cylindrical casing, tubes and tube sheets, transverse lattice and partitions spiral form in the annular space, the bottom and the outlet of inlet and outlet streams (autospid. The USSR №345336, IPC F28D 7/16, publ. 1970). The heat exchanger is complicated to manufacture and has a high metal content.

Known shell-and-tube heat exchanger containing a helical swirling the tubes of oval profile. When circulation Teploobmennik environments in the tube and in the annular space supported swirling flows through the swirling design of pipes (A.S. USSR №840662, IPC F28D 7/00, F28F 1/06, publ. 1979). This heat exchanger can be used in limited cases, as in high speed flows may increase vibration, repair and cleaning of the tubes is problematic.

Known reactor for catalytic purification of gaseous emissions containing a cylindrical housing, a number of devices, including tubular heat exchanger tubes to the showing made by the inclined and located on the circular perimeter of the housing, and fixed in the tube plate, which separates the cavity of the housing to be cleaned and the cleaned gas flows. Gases passing through the pipe, then between the pipes shall be subjected to twisting due to the inclination of the pipe, increasing the heat transfer between the source and the heated flow (RF patent 2299089, IPC B01D 53/86, F23G 7/06, publ. 2005). Disadvantages are uneven speed in Central and peripheral areas of the device, as well as inefficient use of working volume.

Known heat exchanger closest to the claimed invention, which includes a housing in the form of a truncated cone with the heads, the nozzles of the input and output of fluids in the tubing and annulus, baffles, tube, holes are fixed pipe in the form of truncated cones at an angle to the Central axis of the apparatus, as well as one of the Central tube, the axis of which coincides with the axis of the apparatus (patent RF №2372572, IPC F28D 15/00, publ. 2009).

The technical result, which is aimed by the invention, is to increase the heat transfer rate by reduction of the metal, the resistance to flow in the annular space and simplifying the structure.

The technical result is achieved in that in the heat exchange apparatus, comprising a housing in the shape of a truncated cone with heads, nozzles centuries the and output of fluids in the tubing and annulus, tube, the holes are fixed in concentric circles inclined to the axis of the pipe apparatus in the form of truncated cones, vertical Central tube for the location of thermocouples, the new is the fact that the pipes in the shape of a truncated cone made with simultaneous tilt relative to the axis of the apparatus and in a direction around the axis of the device.

Pipe in the shape of a truncated cone is tilted in the direction around the axis of the device by shifting all the circles of their placement, and the angles of the pipes is 0.5-50.0 degrees.

The holes in the tube sheets are made under the truncated cones of the same height closed small peaks.

Figure 1 shows a section of a heat exchanger with inclined pipes; figure 2 is a view in cross-section A-A; figure 3 - node I (execution holes in tube sheets).

Heat exchanger (figure 1) includes a housing 1 in the form of a truncated cone with the bottoms 2 and 3, the nozzles 4 and 5 input and output coolant pipe space, the pipes 6 and 7 respectively of the input and output fluid annulus, tube 8, and 9, the holes are fixed pipe in the shape of a truncated cone 10 and 11. In the Central vertical pipe 11 in the casing is located thermocouple 12. Tubes 10 are arranged at an angle to the Central axis of the housing 1, extend in the direction the attachment of its expansion, the angle of inclination of the pipe 10 located closer to the Central axis of the housing is less than the inclination of the pipe 10 located on the periphery. The slopes of the pipes 10, obtained by the offset ends of the tubes 10 in circles of their placement on the gratings 8 and 9, is substantially greater inclination relative to the axis of the apparatus. The amount of additional angles of inclinations of the pipe 10 is 0.5÷50 degrees. Offset pipe 10 may be subjected to both the upper and lower ends, and at the same time, but in opposite directions. The shape of the body 1 and the pipe 10, which represents a truncated cone, and the presence of tilt relative to the axis of the apparatus can achieve an additional tilt of the pipe 10 in the direction around the axis of the apparatus at a sufficiently large angle relative to the clipping planes passing through the pipe 10 in the radial direction. As a result, without changing the distance between the pipes 10, reach their optimum locations for the flow of fluids in swirling mode in tubular and intertubular spaces. In order to simplify Assembly, the holes in the tube sheets 8 and 9 are made under the truncated cones of the same height closed small peaks. The apparatus body 1, the tube bundle and the tubes 10 and 11 having the shape of a truncated cone, the presence of bending pipe 10 at the same time relative to the axis of the apparatus and in a direction around the axis of the apparatus in the aggregate, p is svolli flowing fluids in the mode of swirling flows more evenly throughout the volume of the annulus. This increases the heat transfer rate without the use of additional devices - intensifiers, and also reduces the height of the tube bundle in comparison with the height of the beam in the apparatus of the prototype, and therefore, decreases the volume of the annulus, which allows to increase the coolant flow.

Heat exchanger operates as follows. In the organization of work of the device parallel, the coolant pipe space is supplied through the pipe 4 and the bottom of the large diameter 2 in the pipes 10 and 11 (figure 1), then, passing in the form of a swirling flow in these pipes 10 and 11, giving or receiving heat through the walls from the coolant annulus, exits through the bottom of the small diameter 3 and the pipe 5 from the apparatus. The coolant annulus enters the apparatus through the pipe 6, passing in the form of a swirling flow, giving or receiving heat through the pipes 10 and 11 and out through the pipe 7.

As the coolant in the region of the small diameter of the housing 1 and the pipes 10 and 11, the temperature difference between the fluids gradually decreases; at the same time flows constrict, therefore, the flow velocity increases. This compensates for the decreasing intensity of heat caused by the decrease in temperature difference. As a result, the intensity of heat exchange OST the fast more constant throughout the heat exchange surface. At the same time, a significant deviation from the rectilinear motion of the flow in the pipe 10, caused by changes in the angles of attack of the inner wall, because the slopes of the pipes 10, enhances heat transfer and closer to the values achievable with the use of additional devices-intensifiers. If the high intensity of heat transfer near the entrance of the fluids were determined by high temperature difference, then close to exit the high-speed flows. In the swirling flow of the coolant is less than the temperature difference in the radial direction between the Central and side sections of pipe 10, which is very important at low teploprovodnosti loaded material and thread. In filled with a highly porous cellular materials or solid catalysts pipes 10 and 11 less chance of uneven wear, accumulation of impurities and the formation of channels of least resistance.

When using a heat exchanger as reactor exothermic process, the reaction mixture initial high concentration of the reacting substances is exposed through the pipes 10 and 11 the effect of fresh coolant annulus, and a greater amount of catalyst per unit path. Intense reaction, followed by intensive heat dissipation, occurs in the zone of intensive warm the transmission, caused by a large temperature difference. When entering the region of the narrowing of the reaction mass in the tube space is depleted of reactive components, the reaction rate is reduced, the heat dissipation would be reduced. However, in this region the velocity of the coolant increases, favoring a shift in the equilibrium towards formation of the desired products, the frequency of collisions with particles of the catalyst also increases, reduced diameter pipes promotes rapid heat transfer reactions. Because of these factors, the intensity of reaction and the heat remain high, the intensity of heat is not reduced. The result is a more complete and uniform flow of process in the apparatus. Moreover, the increase in the rate of the reaction mixture near the exit of the apparatus avoids the collapse of some part of the target product, which increases with prolonged stay in the reaction zone. Approximate calculations showed an increase in the yield of the target product by 3.0 to 5.0% by optimizing the heat removal.

In the case of the organization of parallel heat exchange, the heat transfer medium pipe space is supplied through the pipe 5 and the bottom 3 in the pipes 10 and 11; when passing through the pipes 10 and 11 there is a heat exchange with the coolant annulus, then through the bottom 2 and the pipe 4 extends from the apt the rata. The coolant annulus flows through the pipe 7, passes, twisting and exchanging heat with the coolant pipe space between the pipes 10 and 11 and exits through pipe 6 from the apparatus. In the catalytic conversion of hydrocarbons in the initial period of the reaction, the reaction mixture is rich in raw materials, the intensity of the reaction and the absorption is high. Fresh coolant in the region of high velocities of both fluids (input), as well as swirling flows compensate for the initial absorption. As you progress the reaction mixture along the device it is depleted raw material, with the heat absorption decreases. Gradually begins to influence the increase of the catalyst mass per unit length of the pipes 10 and 11. Education target products remains at the same level. The use of the proposed device as a dehydrogenation reactor according to this scheme allows to avoid attenuation of the reaction and increase the yield of the target products by 5-7 percent, and to reduce the initial temperature of the heating fluid.

When organizing a counter-current heat exchange with heated flows through the pipe 5 and the bottom 3 in the pipes 10 and 11 and extends through the bottom 2 and the pipe 4. Heat flows through the pipe 6 passing between the tubes 10 and 11, out h is cut the pipe 7. This scheme is preferred when using the device as an evaporator or boiler. In this case, the evaporating coolant passes through the tubes 10 and 11, and a vaporizing - tube space. Approaching this thread in the region of the extensions, it is heated to the boil at the expense of increasing of increasing the heat content of volatile fluid and path. At the exit of the tubes total area of the evaporation or boiling increases due to expansion of pipes 10 and 11. Therefore, the process of evaporation and heat transfer is more intense. Additional heat required for vaporization, offset the initial high temperature volatile fluid and twisted threads.

The initial contact of the coolant in the annular space with the peripheral surfaces of the pipes 10 is at an angle less 90 degrees. Stream faster and with less resistance compared to the resistance in the device prototype distributed in the volume near the entrance and exit, which allows to avoid local overheating. This combined with a twisting flow provides a more uniform density, stable turbulence and decrease resistance.

Reducing the height of the tube bundle to reduce the amount of simple tube is of Christianity, which leads to an increase of the volume flow of the coolant at a constant initial flow in the annular space and contributes to a more intensive heat transfer and implementation of high-temperature processes, in addition, it reduces the dimensions of the heat exchanger and hence the intensity.

1. Heat exchanger, comprising a housing in the shape of a truncated cone with the heads, the nozzles of the input and output of fluids in the tubing and annulus, tube, holes are fixed in concentric circles inclined to the axis of the pipe apparatus in the form of truncated cones, vertical Central tube for the location of thermocouples, characterized in that the pipes in the shape of a truncated cone made with simultaneous tilt relative to the axis of the apparatus and in a direction around the axis of the device.

2. Heat exchanger according to claim 1, characterized in that the pipes in the shape of a truncated cone is tilted in the direction around the axis of the device by shifting all the circles of their placement, and the angles of the pipes is 0.5-50,0°.

3. Heat exchanger according to claim 1, characterized in that the holes in the tube sheets are made under the truncated cones of the same height closed small peaks.



 

Same patents:

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.

3 dwg

FIELD: power engineering.

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EFFECT: no necessity to increase input parameters of a coolant, which helps to save thermal and electric power.

5 cl, 4 dwg

FIELD: power engineering.

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EFFECT: reduced dimensions and weight of a shell-and-tube evaporator.

1 dwg

FIELD: power engineering.

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EFFECT: unification and reduction of heat exchanger dimensions.

4 cl, 3 dwg

Heat exchanger // 2451875

FIELD: power engineering.

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8 dwg

Heat exchanger // 2437047

FIELD: power industry.

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FIELD: power industry.

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FIELD: power engineering.

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EFFECT: improved reliability.

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

SUBSTANCE: according to the first modification, the shell-and-tube heat exchanger has a heat exchanger shell with connections for delivery and discharge of the medium with a lower pressure, it envelops the heat-exchanging tubes connected to the tube plate, distributor chamber separated by a partition into the inlet and outlet cavities and limited by the case with connection for delivery and discharge of the medium with a higher pressure, case cover and tube plate having a strengthening tie in the distributor chamber, the strengthening tie is made in the form of a stiffening tube fixed to the case cover of the distributor chamber and the tube plate. According to the second modification, the shell-and-tube heat exchanger has a heat exchanger shell with connections for delivery and discharge of the medium with a lower pressure, it envelops the heat-exchanging tubes connected to the tube plate, distributor chamber separated by a partition into the inlet and outlet cavities and limited by the case with connections for delivery and discharge of the medium with a higher pressure, case cover and tube plate having a strengthening tie in the distributor chamber, the strengthening tie is made in the form of a stiffening tube fixed to the case over of the distributor chamber and the tube plate, the strengthening tie in the form of a stiffening tube with the case cover and the tube plate has a through hole of a permanent or variable flow section. According to the third modification, the shell-and-tube heat exchanger has a heat exchanger shell with connections for delivery and discharge of the medium with a lower pressure, it envelops the heat-exchanging tubes connected to the tube plates, distributor chamber separated by a partition into the inlet and outlet cavities and limited by the case with connections for delivery and discharge of the medium with higher pressure and the tube plates, in the distributor chamber the tube plates are fixed to one another by a strengthening tie in the form of stiffening rod. According to the fourth modification, the shell-and-tube heat exchanger has a heat-exchanger shell with connections for delivery and discharge of the medium with a lower or pressure, it envelops the heat-exchanging tubes connected to the tube plates, distributor chamber separated by a partition into the inlet and outlet cavities and limited by the case with connections for delivery and discharge of the medium with a higher pressure and the tube plates, in the distributor chamber the tube plates are fixed to one another by a strengthening tie in the form of stiffening tube. According to the fifth modification, the shell-and-tube heat exchanger has a heat-exchanger shell with connections for delivery and discharge of the medium with a lower pressure, it envelops the heat-exchanging tubes connected to the tube plates, distributor chamber separated by a partition into the inlet and outlet cavities and limited by the case with connections for delivery and discharge of the medium with a higher pressure and the tube plates, in the distributor chamber the tube plates are fixed to one another by a strengthening tie in the form of a stiffening tube, the strengthening tie in the form of a stiffening tube with tube plates has a through hole of a permanent or variable flow section.

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.

SUBSTANCE: boiler installation has boiler provided with burners, hot-water heater, heat exchangers passing through boiler and hot water heater, economizer and heat exchanger with heat exchanger passing it through. All the units of boiler installation are fixed at the same platform. Case of hot-water heater has several shells; cavities among shells are intended for filling with air and feed water. Cavity intended for filling with feed water is included into feed water circuit between feed water pump and economizer. Cavity intended for filling with air is connected with burners and blower. Heat exchanger disposed inside boiler is made in form of spiral envelopes disposed coaxially. Each envelope is formed by heat-exchange tubes connected with feeding and receiving boards. Envelopes having smaller diameters are shifted to combustion chamber made in form of two sequentially disposed cavities. Heat-exchange tubes of heat exchanger are made to have two sections. Tubes of the first section are made to touch tubes from the second section. Tubes of the second section are put in spiral envelopes to form gaps between surfaces of envelopes.

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

FIELD: equipment for gas cooling and moisture condensing, particularly for atomic power plants.

SUBSTANCE: apparatus comprises shell and coiled tube arranged inside the shell. The shell includes three sections, wherein coiled tube is secured inside middle section. Middle section has oppositely located inlet and outlet pipes for medium circulating in tubes. Coiled tube is formed as straight horizontal tubes with adjacent ends connected through U-shaped branches arranged in removable end sections of the shell, wherein the branches are turned one relative another so that three-dimensional coiled tube mound around vertical axis in formed. The inlet and outlet pipes are arranged in end shell sections, wherein mounting planes thereof are parallel to longitudinal shell axis.

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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