JP2754305B2 - Particle flow heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for exchanging heat between an air stream and a high-temperature fluid or between an air stream and a low-temperature fluid.

[0002]

[Prior art]

(Prior Art 1) FIG. 5 shows a configuration diagram of a conventional particle flow heat exchange apparatus for floating solid particles in a gas stream. In this heat exchange device, an air flow 4 is sent from a lower portion of a heat exchanger 2 through an air flow distribution plate 3 by a blower 1 to cause particles 5 to float and flow around the heat exchanger 2 to promote heat exchange. The configuration is such that the heat of the heat exchanger 2 is radiated to the airflow 4 and discharged out of the apparatus while preventing the particles 5 from scattering by the outflow prevention plate 6.

(Prior Art 2) FIG. 6 is a block diagram of a particle flow heat exchange apparatus showing another prior art. In this heat exchange device, by circulating the particles 5 in the airflow passage 7, the energy loss of the airflow required for floating the particles 5 is reduced.

[0004]

However, in the above prior art 1, the energy of the gas flow 4 is consumed to keep all the particles 5 in a floating state, and the heat exchanger 2 is located in the gas flow passage. Therefore, the heat exchanger 2 becomes a resistance of the airflow 4, and it is necessary to cover the pressure loss due to the resistance of the heat exchanger 2.

[0005] For this reason, the energy loss of the airflow 4 is extremely large, and excessive power of the blower is required. If an excessive blower is used, the particles move inside the casing at a high speed, so that a collision sound between the particles and a collision sound of the particles with the casing wall surface are generated. For these reasons, the noise of the heat exchange device was inevitably increased.

In the prior art 2, since the heat exchanger 2 is disposed in the airflow passage 7, the energy of the airflow 4 must cover the pressure loss caused by the heat exchanger 2. Moreover, since the outflow prevention plate 6 is located below the heat exchanger 2 on the downstream side of the airflow passage 7, particles 5 are deposited on the outflow prevention plate 6 and are deposited on the outflow prevention plate 6. The gas energy consumption due to the pressure loss of the particles 5 is also large.

Further, when the amount of circulating particles changes due to a change in the operating conditions such as the air volume, the surplus particles 5 gather around the air flow distribution plate 3 and the outflow prevention plate 6, increasing the pressure loss and increasing the heat exchanger 2. Performance becomes unstable. Further, regarding the heat radiation, when the particles 5 are cooled, since the airflow 4 is used in parallel, there is a disadvantage that the particles 5 cannot be sufficiently cooled.

[0008] In view of the above, it is an object of the present invention to improve the performance of a particle flow heat exchanger by improving the particle cooling and to reduce noise.

[0009]

According to the first aspect of the present invention, as shown in FIG. 1, a heat exchanger 12 is provided at a lower portion of an apparatus main body 11, and a particle storage section is provided around the heat exchanger 12. 13 is provided, and conveying means 15 for raising the solid particles 14 from the lower part to the upper part of the apparatus main body 11 is provided. The air sucked from the suction port 17 by the blower 16 by the blower 16 is Is formed, and the heat radiating section 1 that transfers heat between the falling solid particles 14 and the rising airflow is formed in the airflow passage 18.
9 is provided, and a dispersion 20 for dispersing the solid particles 14 in the horizontal direction is provided in the heat radiating section 19.

As shown in FIG. 2, a heat exchanger 12 is provided at a lower portion of an apparatus main body 11, and a particle storage section 13 is provided around the heat exchanger 12. A transfer means 15 for raising the solid particles 14 is provided from the lower part to the upper part, and heat is transferred between the air sent from the inlet 30 and the falling solid particles 14 above the particle storage part 13. And a blower 31 for generating a swirling flow in the heat radiating section 19 is provided at the suction port 30.

[0013] According to a third aspect of the present invention, as shown in FIG. 2, the wall of the heat radiating section 19 is formed of a mesh-like solid-gas separation plate 32.

As shown in FIG. 3, the means for solving the problem according to claim 4 is that a heat exchanger 12 is provided at a lower portion of an apparatus main body 11, a particle storage section 13 is provided around the heat exchanger 12, and A transfer means 15 for raising the solid particles 14 is provided from the lower part to the upper part, and heat is transferred between the air sent from the inlet 30 and the falling solid particles 14 above the particle storage part 13. Is provided at the suction port 30, and a blower 31 for generating an air flow 25 for floating the solid particles 14 in the heat radiating unit 19 is disposed at the suction port 30. The air flow 25 is dispersed below the heat radiating unit 19. An air flow dispersion plate 33 for suspending the solid particles 14 is provided.

[0013]

According to the first aspect of the present invention, the solid particles 14 are lifted by the conveying means 15 and fall down the air flow passage 18. The solid particles 14 exchange heat with the ascending airflow in the heat radiating section 19 to be exchanged.
Since the solid particles 14 hit the dispersion plate 20 during the fall, the solid particles 14 are dispersed in the horizontal direction, and become resistance at the time of drop.

According to the second aspect of the present invention, a swirling flow is generated in the heat radiating section 19 by the blower 31 disposed at the suction port 30. The particles 14 that have risen by the transporting means 15 fall while circling by the swirling flow in the heat radiating section 19, so that the traveling distance of the solid particles 14 in the air increases.

According to a third aspect of the present invention, there is provided an air flow which exchanges heat with the solid particles in the heat radiating section.
Is discharged from a mesh-like solid-gas separation plate 32 which is a wall of the heat radiating portion 19. On the other hand, the solid particles 14 hit the solid-gas separation plate 32 and fall into the particle storage 13.

According to the fourth aspect of the present invention, the rising airflow 25 generated by the blower 31 is dispersed by the airflow distribution plate 33, and the falling solid particles 14 are caused to float and flow in the radiator 19.

[0017]

【Example】

(First Embodiment) FIG. 1 is a block diagram showing a first embodiment of a particle flow heat exchange apparatus of the present invention.

As shown in FIG. 1, in the particle-flow heat exchange apparatus of this embodiment, a heat exchanger 12 is provided at a lower portion of a cylindrical apparatus main body 11 having an open top, and a particle storage section is provided around the heat exchanger 12. 13 is provided, and conveying means 15 for raising the solid particles 14 from the lower part to the upper part of the apparatus main body 11 is provided. Airflow passage 18 to guide
Is formed, and a heat radiating portion 19 that transfers heat between the falling solid particles 14 and the rising airflow is provided in the airflow passage 18, and the solid particles 14 are dispersed in the heat radiating portion 19 in the horizontal direction. A dispersion 20 is provided.

The heat exchanger 12 comprises a heat transfer tube 12a and a fin group. The heat transfer tube 12a is horizontally arranged in a ring shape, and allows a high-temperature fluid or a low-temperature fluid to flow through the heat transfer tube 12a. And heat exchange.

The particle storage section 13 is a section in which solid particles 14 are filled around a heat transfer tube 12a, and heat exchange with the heat exchanger 12 is performed.

The solid particles 14 include silica, alumina,
It is a particle having a diameter of 0.1 mm to 1 mm composed of glass, river sand, copper, iron or the like in addition to polystyrene.

The transport means 15 includes a circular conveyor cover 21 erected at the center of the apparatus main body 11 and a screw conveyor 22 housed therein. The screw conveyor 22 includes a vertical axis 22a rotatably supported on the bottom surface of the apparatus main body 11, and a spiral blade 22b fixed to the vertical axis 22a. The vertical axis 22a is driven to rotate by a motor (not shown). In the lower part of the conveyor cover 21, a particle inlet 23 communicating with the particle reservoir 13 is formed, and the solid particles 14 entering the conveyor cover 21 are formed.
Is transported upward by the spiral blade 22b.

The air flow passage 18 extends from an inlet 17 formed above the particle reservoir 13 on the side surface of the apparatus body 11 to an air outlet 24 on the upper surface of the apparatus body 11 along the inner wall surface of the apparatus body 11. 25 are formed to flow. The blower 16 is disposed at the outlet 24,
An air flow 25 from 7 to an outlet 24 is generated. A particle outflow prevention plate 26 is attached below the blower 16.

The heat radiating portion 19 is a space in a range above the suction port 17 in the air flow passage 18 and below the upper surface of the conveyor cover 21, and the particles 14 and the air current 25 are flowing countercurrently.

The upper end of the conveyor cover 21 is open and communicates with the airflow passage 18. In addition, heat radiating section 1
A space from the upper part 9 to the lower part of the particle outflow prevention plate 26 is defined as a chamber 27.

The dispersion member 20 is made of a metal (copper, aluminum, etc.) mesh (several to several tens of meshes), and is provided at two locations in the heat radiating portion 19. Upper mesh 2
The reference numeral 0a extends inclining from the upper end of the conveyor cover 21 toward the inner wall surface of the apparatus main body 11, and is set so that the particles 14 can be easily dispersed in the horizontal direction. The lower mesh 20b is stretched horizontally above the suction port 17.

A particle outflow prevention plate 28 is attached to the suction port 17 of the apparatus main body 11.

In the above configuration, when the heat exchanger 12 is used as a condenser, the particles 14 in the particle storage 13 are
Heat is received from the heat exchanger 12 and the temperature becomes high. Due to the rotation of the screw conveyor 22, the solid particles 14 below the particle storage 13 are moved from the particle inlet 29 to the conveyor cover 21.
Inside, the particles 14 are mechanically carried upward by the screw conveyor 22, discharged into the chamber 27, and fall by the action of gravity.

Particles 1 released into chamber 27 and falling
Since the particles 4 fall while hitting the meshes 20a and 20b in the heat radiation part 19, they are dispersed in the horizontal direction and the particle density becomes uniform. In addition, since it also becomes a resistance at the time of dropping, the dwell time of the particles 14 is extended.

On the other hand, the rising airflow 25 generated by the blower 16 faces the particles 14 through the airflow passage 18,
The particles 14 are cooled by the heat radiating portion 19, and the temperature of the airflow 25 itself rises. Then, the airflow 25 that has become warm air is separated from the particles 14 by the outflow prevention plate 26 through the chamber 27 and is discharged from the outlet 24.

The particles 14 cooled by the heat radiating section 19 pass through the lower mesh 20b, fall by gravity, return to the upper part of the particle storage section 13, and return to the initial state.

As described above, the mesh 20 is provided in the heat radiating portion 19.
Since a and 20b are stretched, the particles 14 once hit the meshes 20a and 20b, bounce off, and fall from the mesh. For this reason, the resistance of the particles to fall is caused, and the time during which the particles 14 stay in the heat radiating portion 19 becomes longer. Therefore, the heat exchange efficiency between the airflow 25 and the particles 14 is improved, and the heat radiating portion can be made compact, so that the size of the apparatus body can be reduced.

In the airflow passage 18, the particles 14 move from top to bottom, and the airflow 25 moves from bottom to top, so that they flow countercurrently, so that the particles 14 can be cooled more than cocurrent. Therefore, the heat exchange efficiency between the airflow 25 and the particles 14 is improved. Further, since the heat exchanger 12 is not disposed in the airflow passage 18 and is located below the suction port 17, the airflow 22 is used purely for cooling only. Therefore, the air volume can be reduced, which is advantageous for noise reduction.
It is clear that these are advantageous for power saving.

In the above embodiment, the description has been made on the assumption that a high-temperature fluid flows in the tubes of the heat exchanger. However, the present invention is not limited to this, and it is apparent that a low-temperature fluid may flow. is there.

(Second Embodiment) FIG. 2 is a structural view showing a particle flow heat exchange apparatus according to a second embodiment of the present invention, and FIG. 3 is a plan sectional view of the particle flow heat exchange apparatus.

The particle flow heat exchange apparatus of this embodiment is shown in FIG.
3, the suction port 30 is provided in parallel with the circumferential tangential direction of the apparatus main body 11, the blower 31 is attached to the suction port 30, and provided so as to generate a swirling flow in the air flow passage 18; The wall of the portion corresponding to the heat radiating portion 19 of the main body 11 is formed of a mesh-like solid-gas separation plate 32.

Therefore, the air flow 25
Rises from the bottom upward while turning, and the particles 14
It falls by gravity while turning with it. Therefore, rather than dropping directly by rotating the particles 14,
Since the traveling distance of the particles 14 in the air increases while maintaining the relative speed with the airflow 25, the cooling capacity is improved, and the efficiency of heat exchange is improved.

Then, the air flow 25 received from the particles 14
Is discharged upward and laterally from the solid-gas separation plate 32.
Therefore, the pressure loss of the air flow 25 on the wall surface can be drastically reduced by the solid-gas separation plate 32, which is advantageous for noise reduction.

(Third Embodiment) FIG. 4 is a block diagram showing a particle flow heat exchanger according to a third embodiment of the present invention.

In the particle-flow heat exchange apparatus of this embodiment, as shown in FIG. 4, a blower 31 is disposed at a suction port 30, and the particles 14 float and flow in the heat-radiating section 19 by an airflow 25 of the blower 31.

The airflow passage 18 above the inlet 30
, An air flow distribution plate 33 is attached. Airflow distribution plate 3
3, a large number of holes 33a for dropping the solid particles 14;
Are formed.

The particles 14 in the particle storage 13 are transferred to the heat exchanger 12
From the bottom of the apparatus main body 11, the screw conveyor 22 sequentially lifts the particles 14 upward, so that the particles 14 in the particle storage unit 13 also receive the heat from the heat exchanger 12 and successively move downward. Moving. The particles 14 lifted by the screw conveyor 22 are discharged into the chamber 27, fall by gravity, and fall into the heat radiating section 19. The airflow 25 generated by the blower 31
Passes through the airflow distribution plate 33 and is uniformly dispersed in the horizontal direction to become an ascending airflow, which causes the particles 14 to float and flow in the heat radiating portion 19 and rapidly cool. The cooled particles 14 fall down by an amount equivalent to the amount discharged from the screw conveyor 22,
It will be in the initial state.

As described above, in the heat radiating portion 19, the particles 14 are used only for heat radiation by floating and flowing, and the particles 14 are sequentially taken in and out. Can be. In addition, since the particles 14 temporarily accumulate in the air flow distribution plate 33, the particle density of the heat radiating portion 19 is increased, and the heat radiating portion 19 can be made compact.
Since the amount of particles in the floating layer is small and the heat exchanger 12 is not provided in the heat radiating section 19, the height of the layer of particles 14 can be reduced, and the pressure loss of the airflow 25 can be reduced.

Further, since the airflow 25 is used purely for cooling, the airflow can be reduced, which is advantageous for noise reduction. It is clear that these are advantageous for power saving.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention. For example, in the above embodiment, the heat exchanger is described as a condenser, but the same effect can be expected with an evaporator.

[0046]

As is apparent from the above description, according to the first aspect of the present invention, the falling solid particles are dispersed in the heat radiating portion by the dispersing member, so that the time during which the solid particles fall to the particle storing portion is reduced. Can be lengthened. Therefore,
The heat exchange efficiency between the airflow and the particles is improved, and the heat radiation part can be made compact.

According to the second aspect, the solid particles fall while rotating while being swirled by the airflow generated by the blower, so that the traveling distance in the air increases, and the heat exchange efficiency between the solid particles and the airflow is improved.

According to the third aspect of the present invention, since the gas flows from the mesh-shaped solid-gas separation plate into the atmosphere after heat exchange between the particles and the heat radiating portion, the energy of the gas flow is reduced by the wall surface, the pressure loss is reduced, and the noise is reduced. Is possible.

According to the fourth aspect, since the solid particles float and flow in the heat radiating portion by the air current, the particle density of the heat radiating portion is increased, the heat radiating portion is made compact, and a low pressure loss of the air current becomes possible.

According to the first to fourth aspects, the circulation direction of the particles and the direction of the air flow are countercurrent, and the heat exchanger is not arranged in the air flow passage, so that the heat exchange efficiency is improved, and Since the apparatus can be made compact, the size of the apparatus body can be reduced.

The air flow is used only for heat exchange with the solid particles, so that the use of an excessive blower becomes unnecessary and the amount of air can be reduced, so that an excellent effect that noise can be reduced can be achieved. There is.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a particle flow heat exchange apparatus showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a particle flow heat exchange apparatus showing a second embodiment of the present invention.

FIG. 3 is a plan cross-sectional view of a particle flow heat exchange apparatus showing a second embodiment.

FIG. 4 is a configuration diagram of a particle flow heat exchange apparatus showing a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a particle flow heat exchange device according to prior art 1.

FIG. 6 is a configuration diagram of a particle flow heat exchange device according to prior art 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Device main body 12 Heat exchanger 13 Particle storage part 14 Solid particle 15 Conveying means 16 Blower 17 Suction port 18 Air flow passageway 19 Heat radiating part 20 Dispersion 25 Air flow 30 Suction port 31 Blower 32 Solid gas separation plate 33 Air flow dispersion plate

Claims (4)

(57) [Claims] 1. A heat exchanger is provided at a lower portion of an apparatus main body,
A particle storage portion is provided around the heat exchanger, a conveying means for raising solid particles from a lower portion to an upper portion of the device main body is provided, and air sucked from a suction port by a blower is provided above the particle storage portion to the device. An airflow passage leading to the upper portion of the main body is formed, and a heat radiating unit that transfers heat between the falling solid particles and the rising airflow is provided in the airflow passage, and the solid particles are horizontally radiated to the heat radiating unit. A particle flow heat exchange device, comprising: a dispersant for dispersing in a direction. 2. A heat exchanger is provided at a lower portion of the apparatus main body,
A particle storage section is provided around the heat exchanger, and a conveying means for raising solid particles from a lower portion to an upper portion of the apparatus main body is provided, and the air sent from the suction port is dropped above the particle storage section. A heat exchange unit for transferring heat to and from incoming solid particles is provided, and a blower for generating a swirling flow in the heat dissipation unit is provided at the suction port. 3. The particle fluidized heat exchanger according to claim 2, wherein the wall of the radiator is a mesh-like solid-gas separator. 4. A heat exchanger is provided at a lower portion of the apparatus main body,
A particle storage section is provided around the heat exchanger, and a conveying means for raising solid particles from a lower portion to an upper portion of the apparatus main body is provided, and the air sent from the suction port is dropped above the particle storage section. A radiator for transferring heat to and from the incoming solid particles is provided; a blower for generating an airflow for floating the solid particles in the radiator is provided at the suction port; A particle flow heat exchange device, comprising: an airflow dispersion plate for dispersing the particles to suspend solid particles.