JPS594888A - Fluid dispersion device of fluidized layer type heat exchanger - Google Patents

Abstract

PURPOSE:To lower the height of a window box, to contrive the miniatruizing of the device, and to introduce uniformly the high temperature fluid into a particle layer by arranging a baffle plate and a dispersion plate inside of a window box in which the high temperature fluid is introduced. CONSTITUTION:A window box 9 is formed of a introducing inlet 2 for a high temperature fluid A and a dispersion plate 8 holding a casing and a particle layer 6. A baffle plate 10 having the same area as an introducing inlet 2 and provided with holes having the 1/4-1/10 area of said introducing inlet is arranged at the upper part of the introducing inlet 2. The first dispersion plate 8a made of wire mesh is located at the upper side of the baffer plate 10, the second dispersion plate 8b (wire mesh perforated metal, porous plate) is arranged at the location separated the ten times distance of the space distance between each element wire from the first dispersion plate 8a. When the diameter of a small hole is made larger than 1/4 of the introducing inlet area, the sufficient uniform flowing of the fluid inside of the window box can not be obtained, while when said hole diameter is smaller than 1/10 of said inlet area, the vibration caused by the impact is increased. The separating distance between the first dispersion plate 8a and the second dispersion plate 8b is ten times the space distance between each element wire of the first dispersion plate 8a. The purpose of providing such a separating distance is elongating the peripheral fluid up to said distance (5-7 times of the opening part diameter), forming of the diffusion layer and increasing of the flow uniforming at the location separated at the distance larger than said distance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fluid dispersion device for uniformly introducing high temperature fluid into a fluidized bed of a fluidized bed heat exchanger.

[Technical disadvantages and problems of the invention] In a fluidized bed heat exchanger, it is preferable that the high temperature fluid introduced into the flowing particle bed is uniformly introduced. The reason for this is that each particle is given kinetic energy by the fluid flow rate rising in the particle bed and begins to flow, and the flow rate of the high-temperature fluid that starts the flow is determined by the particle size. The particle sizes of the particles are almost the same, so the difference in the flow velocity of the introduced high-temperature fluid governs the strength of the particle motion.If the flow velocity in a certain part of the particle layer is always faster than in the other part, the particle motion in that part will be accelerated. A channeling state occurs in which particles are scattered and high-temperature fluid constantly flows in the particle layer, and the flow is not uniform, causing the actual if of the heat transfer tube involved in heat transfer.
This is because 74ft decreases by 1- and the amount of heat transfer decreases.

In order to prevent this channeling state, the distance from the high-temperature fluid inlet to the dispersion plate is increased, in other words, the wind box is made larger, and the cross-sectional area force of the wind box is smoothly increased by 1 to create a uniform flow. or a rectifier room (
A rectifying plate (straightening plate) was installed in the wind box to create a uniform flow, and a dispersion plate also created pressure loss to create a more uniform flow velocity distribution and allow the highly eddy fluid to flow into the particle layer. However, these methods have caused disadvantages such as an increase in the height (dimensions) of the device and the addition of a rectifying chamber, which increases the weight. In addition, in order to prevent the device from increasing in size, the dispersion plate itself was devised, and a large number of screws were arranged on one plate to guide the high-temperature fluid to the particle layer through the gaps in the threaded screw holes. There is a proposal to make the direction of motion parallel to the dispersion plate so that the flow velocity of the high-temperature fluid rising through the particle layer is uniform, but this requires a considerable amount of time to arrange the screws, dimensional accuracy of the screws and screw holes, maintenance, cost, etc. Therefore, it could only be used for specific purposes.

[Object of the Invention] In view of these points, the present invention aims to shorten the height of the wind box, reduce the size of the device, and provide a fluid fractionator that more uniformly guides the high-temperature fluid introduced into the particle layer. The purpose is to provide.

[Summary of the Invention] In a fluidized bed heat exchanger in which heat exchanger tubes are disposed in a particle bed, a wind box into which high temperature fluid is introduced has an area approximately equal to the inlet above the high temperature fluid inlet. , a jammer plate with a hole in the center having a size of 1/4 to 1/1 o of the inlet area, a distribution plate of wire mesh on the side near the high temperature fluid inlet, and a space distance created by the wires of the wire mesh. It is characterized in that the second dispersion plate is disposed at a location 10 times or more away.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

In FIG. 1, reference numeral 1 denotes a casing of a heat exchanger, and the lower end of the casing 1 is provided with an inlet 2 through which high-temperature fluid A is introduced, and the upper end is provided with an outlet 3 through which high-temperature fluid A is discharged. is provided.

There is a heat exchanger tube 4 that introduces the heated fluid B into the outer end of the outlet 3 of the casing I, and the heat exchanger tube 5 is arranged in a meandering manner in the particle layer 6, and the outer end of the inlet 2 of the casing 1 It is connected to the lower heat transfer tube installed in the section. A wind box 9 is formed by the introduction port 2 of the high temperature fluid A, the casing 1, and the dispersion plate 8 that supports the particle layer 6, and has the same area as the introduction port 2 above the introduction port 2, and is 1/4 of the area. ~
A jammer plate 10 having a 1/1° hole is provided. Above this jammer plate 10, there is a first dispersion plate 8a made of wire mesh, and a second dispersion plate 8b (wire mesh punching metal, porous board) are arranged.

Now, the high-temperature fluid A that has flowed into the wind box 9a from the inlet 2 advances to the baffle plate 10, a part of the high-temperature flow 2+'lA passes through the small hole in the baffle plate 10, and the other high-temperature fluid A flows through the baffle plate 10. The direction of movement can be changed and it spreads across the entire wind box. The jammer plate 10 is shown in Fig. 2 as shown in Fig. 1.
- As shown in the cross section seen from two directions, there is a small hole, and a part of the high temperature fluid passes through it, so there is no flow at all behind the baffle board 1o (dead water area) Therefore, a uniformly turbulent flow is formed over the entire area within the wind box 9b from the rear of the baffle plate 10 to the first dispersion plate 8a. In addition, since a portion of the high temperature fluid A slips through the small holes in the baffle plate 10, the impact of the high temperature fluid A that collides with the baffle plate 910 can be alleviated, and vibration and noise caused by the collision can be prevented.
Moreover, the strength of the jammer plate is not required so much. If the diameter of the small hole is made larger than 1/4 of the inlet area, the flow inside the wind box will not be made uniform enough, and if it is made smaller than IAo, the imaging due to impact will increase. A goes toward the first dispersion plate 8a and passes there.

Figure I43 shows how the high-temperature fluid A is dispersed at a uniform flow rate by the dispersion device 8. It is well known in fluid mechanics that separation occurs from a cylinder placed in a flow, but this separation phenomenon also occurs when high-temperature fluid A passes through the first distribution plate 8a made of wire mesh. . The separation phenomenon creates turbulence in the surrounding fluid, and since this separation occurs from all the strands of the wire mesh, the turbulence of the hot fluid A becomes more uniform, and the upward flow velocity of the hot fluid A increases throughout the passage, i.e., through the wind. It becomes uniform in box 9c. The distance between the second dispersion plate 8b and the first dispersion plate 8a is ten times the spatial distance formed by the strands of the first dispersion plate 8a. This is the first
The distance at which the flow velocity of the high-temperature fluid can be maintained from the opening of the dispersion plate 8a is 5 to 7 times the diameter of the opening, assuming that the flow is a free jet. (
This is because the surrounding fluid is diffused up to 5 to 7 times the opening diameter, creating a diffusion layer, and the flow becomes more uniform over longer distances.

In the present invention, since the distance between the first dispersion plate 8a and the second dispersion plate 8b is set to 10 times, the high-temperature fluid A flowing toward the high-temperature fluid 8b becomes a more uniform flow in the F direction in the wind box 9C, and It advances to the dispersion plate 8b. The second dispersion plate 8b is made of wire mesh, punched metal, or sintered metal to help retain fluid particles and more uniformly disperse hot fluid particles.

The high-temperature fluid that passed through the fluid dispersion device in this way
The particle layer 6 is made into a uniform fluid state, heat is given to the heated fluid B through the heat transfer tube 5 disposed there, and the discharge port 3
more excreted.

In the above embodiment, one hole is provided in the center of the jammer plate 10, but the same effect can be obtained even if a plurality of holes are provided with the same area.

[Effect of the invention] The wind box into which the high-vortex fluid is introduced has a hole in the direction of the high-temperature fluid inlet F that has an area approximately equal to the inlet and has a hole in the center of the hole that is 1/4 to IAO of the inlet area. The jammer plate and the dispersion plate are doubled, and the dispersion plate close to the high-temperature fluid is used as a wire mesh, and the second branching plate is placed at a location more than 10 times north of the spatial distance created by the wires of the wire mesh. As a result, the high-temperature fluid flowing in from the inlet quickly spreads inside the wind box and enters the particle layer as an upward flow with a uniform velocity.
Creates a uniform flow state and increases heat transfer efficiency.By providing holes in the baffle plate, when high-temperature fluid collides with the baffle plate, the collision force at the corners is weakened, preventing the generation of vibration and noise, and increasing the strength of the baffle plate. is not so necessary and is lightweight.

Since devices such as a rectification chamber are not required, the size of the fluidized bed heat exchanger can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a flow 1 heat exchanger with a fluid dispersion device according to an embodiment of the present invention, and 2V is a Z-
3 is an enlarged view of the fluid dispersion device. 1 casing, 2...inlet, outlet, 5 heat exchanger tube, 6 particle layer, 8 dispersion plate, 9...wind box, 10...obstruction plate 0 agent patent attorney rules
Kensuke Chika (and 1 other person)

Claims (1)

[Claims] ■In a fluidized bed heat exchanger in which a heat transfer tube is placed in a particle layer consisting of a large number of particles, the wind box into which the fluid is introduced has an area approximately equal to the inlet above the fluid inlet, 1/4 to 1/1 of the cross-sectional area of the inlet in the center
A barrier plate with 0 holes, a wire mesh dispersion plate on the side closer to the inflow fluid, and the element of the wire mesh.Multiple holes are provided in the barrier plate, and the total area of these holes is 1/1 of the fluid inlet area. 4
~'AO A fluid dispersion device for a fluidized bed heat exchanger according to claim 1.