JPS58142191A - Fluidized bed type heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the scattering of particles of a particle layer by a method wherein fins are attached to a heat transfer tube arranged in an empty tower section of the titled heat exchanger such that the fins are inclined toward the direction of the upward flow of a high temperature flowing through the heat transfer tube with the terminating ends of the adjoining fins overlapped one another. CONSTITUTION:The fins 10 are attached to the heat transfer tube 7a arranged in the empty tower section 6 of the heat exchanger in such a manner that the fins are inclined with respect to the direction of the upward flow of the high temperature fluid A with the terminating ends of the adjoining fins overlapped one another. With the above structure, when the high temperature fluid A passes through the particle layer 5, scattering particles run gainst the inclined and overlapped fins 10 and fall down. Accordingly, the particles 5 do not scatter and the height of the empty tower section 6 of the heat exchanger can be reduced so that no wire netting for preventing the scattering of the particles is required and the resistance against the flow of the high temperature fluid A is reduced to thereby improve the heat exchange efficiency of the heat exchanger.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fluidized bed heat exchanger in which heat exchanger tubes are disposed within a fluidized bed in which a large number of particles are accumulated.

[Technical background of the invention and its problems] General K. In the above-mentioned fluidized bed heat exchanger, when the fluid flow rate exceeds the velocity at which the particles are made to flow (flow start velocity), the particles begin to move and the particle bed is Start flowing from rest. In this state, the fluid that has passed through the dispersion plate installed at the bottom of the fluidized bed moves particles as it rises in the bed and coalesces, and at the bed surface, the passage resistance due to the particles is As the pressure suddenly decreases, this fluid becomes 1! Violent bursting of bubbles occurs, and this bursting causes particles on the surface of the layer to fly high out of the layer. Furthermore, when the fluid is a liquid, particles may be carried out of the layer along with the flow.

Furthermore, in a fluidized bed, particles are packed in an orderly manner, but due to the rise of the fluid, the particles move and move away from the space they were in until then, and the fluid fills that space.1-The volume of the fluidized bed increases.

Therefore, in order to prevent particles from scattering from the increased fluidized bed as described above, the height of the empty column formed at the top of the fluidized bed must be greater than the height reached by the flying particles. First, there are problems such as an increase in the height of the device. In addition, to prevent particles from scattering outside the layer,
Some methods use wire mesh, etc. with a mesh smaller than the particle diameter, but in such devices, particles adhere to the mesh of the wire mesh, reducing the effective passage area for high-temperature fluid, increasing passage resistance, and causing high-temperature The cape has the disadvantage of increasing the power required to transport the fluid, causing haze, and in severe cases, inducing a closed group state, which significantly reduces the performance as a heat exchanger.

[Purpose of the invention]

In view of these points, the present invention can prevent the scattering of particles that have jumped out of the layer, significantly reduce the height of the empty column, and can sufficiently recover Ml from the fluid to improve heat exchange efficiency. It is an object of the present invention to provide a fluidized bed heat exchanger that can improve the fluid passage resistance and prevent an increase in fluid passage resistance.

[Summary of the invention]

The present invention provides a fluidized bed heat exchanger in which heat exchanger tubes are provided in the fluidized bed and in the empty column, and the heat exchanger tubes installed in the empty column are provided with fins. The fins are inclined with respect to the direction, and are arranged so that parts of the fins adjacent to each other are positioned in front and back relative to the upward flow direction of the fluid to prevent particles flying out of the layer from scattering,
It is characterized by being pressurized so that the height of the empty column can be significantly reduced.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

In Fig. 1, there is shown a casing of a heat exchanger with the symbol IFi, and one end of the casing 1 is provided with an inlet 2 into which high-temperature fluid A is introduced, and the other end is provided with an inlet 2 through which high-temperature fluid A is discharged. 1, said casing 1 being provided with an outlet 3;
A dispersion plate 4 for uniformly distributing the high-temperature fluid A is installed on the side of the inlet 2 in the interior, and a large number of particles are accumulated on the dispersion plate 4 to form a particle layer 5. A hollow tower portion 6 is formed above.

Incidentally, a meandering heat transfer tube 7 is disposed inside the particle layer 5 and the empty tower section 6 in which the particles are accumulated, and the outer end of the casing 1 on the discharge 1 side 3 is provided with the empty tower section 6. Heat transfer located in section 6 ii 7 a K connected heated fluid B
A heat exchanger tube assembly 8 is installed to introduce the heat exchanger into the heat exchanger tube 7, and a particle layer 5 is further provided on the outer side of the inlet 2 of the casing 1.
Heat exchanger tube outlet 9 connected to heat exchanger tube 7b4C arranged inside
is provided. Further, at least the uppermost heat exchanger tube of the heat exchanger tubes 7a disposed in the empty tower section 6 has an inlet 2.
Fins 10 are provided that are inclined with respect to the flow direction of the high-temperature fluid supplied from and rising. As shown in an enlarged view in FIG. 2, the fins 10 are arranged in a trap such that a portion of the fins adjacent to each other are positioned in front and back relative to the upward flow direction of the fluid.

That is, when the fins 10 to the heat transfer tube 7 are projected onto a plane perpendicular to the upward flow of the high-temperature fluid A, adjacent fins overlap each other.

The high-temperature fluid A that has flowed into the casing 1 from the inlet 2 is uniformly distributed within the casing 1 by the dispersion plate 4, passes through the particles 115 and the empty column 6, and is discharged from the outlet 3 to the outside of the apparatus. On the other hand, heated fluid B has a heat transfer tube population of 8
From there, it enters the finned heat exchanger tube 7a in the empty tower section 6, is further heated while passing through the heat transfer W7b located in the particle layer 5, and flows out from the heat exchanger tube outlet 9. Therefore, the particles in the particle layer 5 are repelled by the high-temperature fluid, but the particles C scattered from the particle layer 5 are partially overlapped by the fins 10 of the heat exchanger tubes 7a in front and rear positions with respect to the flow direction of the high-temperature fluid. YoK
Therefore, the particles C collide with the fins and fall into the particle layer where they do not lose kinetic energy, and the scattered particles C are heat transfer with fins i? It is best to pass through part 7a and proceed to the discharge port 3 side.

On the other hand, the high temperature fluid AFi easily passes through the gap between the fins 10 and flows out from the outlet 3. In addition, heat transfer occurs between the high-temperature fluid A and the heat transfer tube 7m through the fins, so the heat conversion efficiency increases, the temperature change of the high-temperature fluid A decreases, the volume becomes smaller, and the flow velocity decreases. It is easy to change the direction of the fluid, and there is not much flow resistance5.In addition, in the above example, each fin 10 is shown as a flat plate, but as shown in FIG.
0 to the center line of the heat transfer tube. It is also possible to have the upper and lower ends tilted in opposite directions, or the support may have both upper and lower ends tilted in the same direction as shown in FIG. In either case, when each fin is projected onto a plane perpendicular to the upward flow of the high-temperature fluid, adjacent fins overlap each other, thereby achieving the same effect as in the first embodiment. play.

〔Effect of the invention〕

As explained above, in the present invention, the heat exchanger tubes disposed in the cavity formed at the upper part of the fluidized bed of particles are inclined at a angle of 1- in the upward flow direction of the high-temperature fluid, and
Some of the adjacent fins 1, 1... Since the fins were provided so that they were positioned in front and back relative to the upward flow direction of the fluid, the particles were scattered above the heat exchanger tubes in the sky column by the fins. Therefore, the height of the empty column can be reduced to A to Kaede compared to the conventional tube, and the height of the entire apparatus can be reduced. Moreover, unlike the case where a wire mesh is used to prevent particles from scattering, the fluid flow path is not blocked.

-Furthermore, since four M transmissions are carried out in each fin of the finned heat exchanger tube, the heat exchange efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view of a fluidized bed exchanger according to an embodiment of the present invention, FIG. 2 is an enlarged view showing the relationship between finned heat exchanger tubes and scattered particles, and FIGS. FIG. 7 is an enlarged view of a finned heat exchanger tube according to another embodiment of the invention. DESCRIPTION OF SYMBOLS 1...Casing, 2...Introduction E1.3...Discharge port, 5...Particle layer, 6. Sky column part, 7...Heat exchange tube, l
O...fin 0 Applicant's agent a Mk Kiyoto 1 Zukihoki 20 OQOo OOZO'o6 a oo a

Claims (1)

[Claims] 1. In a fluidized bed heat exchanger having heat transfer tubes in the fluidized bed and in the empty column, the heat transfer tubes disposed in the empty column are provided with fins, and the fins are connected to the upward flow of high-temperature fluid. 1. A fluidized bed heat exchanger, characterized in that a part of the fins are inclined with respect to the direction and are arranged so that a part of the fins adjacent to the fins are located in front and back relative to the upward flow direction of the fluid. 2. The fluidized bed heat exchanger according to claim 1, wherein all the fins are inclined in the same direction. 3. The soft fluidized bed heat exchanger according to claim 1, wherein the front and rear portions of the fins are inclined in opposite directions.