JPS58200994A - Dispersing plate for fluidized-bed heat exchanger - Google Patents

Abstract

PURPOSE:To keep the state of a flow, in which grains are under an excellent state, by constituting the dispersing plate for the fluidized-bed heat exchanger by a porous plate with openings larger than grain size and a gauze, the openings of meshes thereof are small, in heat recovery for an industrial waste gas, etc. CONSTITUTION:A high-temperature waste gas (a) brings grains on the openings 10 of the dispersing plate 3 to a fluidized state as jets, and exchanges heat with a medium to be heat-exchanged through a heat-transfer pipe in a grain layer. The dispersing plate 3 consists of the porous plate 11 with a large number of conical projections 9 and having the openings 10, diameters thereof are larger than grain size, at the centers and the gauze 12, the openings of meshes thereof are smaller than grain size, and the outer circumference 13 of the plate 3 is welded to the porous plate 11. Accordingly, clogging is not generated in the openings of the porous plate, and a gas ejected from the openings passes through concave sections 14 among the projections and is ejected from sections not clogged even when clogging is generated partially in the gauze, thus keeping the state of the flow in which grains are under the excellent state, hence no lowering in the performance of heat transfer.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a distribution plate for a fluidized bed heat exchanger.

[Technical background of the invention and its problems]

In recent years, amid the social imperative for energy conservation, attention has been paid to the recovery of heat from factory waste gas and internal combustion engine waste gas, which had previously been discarded into the atmosphere. These waste gases are generally of low quality, including corrosive substances.A heat exchanger that can effectively recover the heat contained in this waste gas must have a high heat transfer coefficient and a heat transfer surface that is always clean with particles. A fluidized bed heat exchanger is considered to be promising because it has the characteristic of maintaining the same temperature.The conventional technology and problems will be explained below with reference to FIG.

High-temperature waste gas (a) from factories, internal combustion engines, etc. flows into the wind box (2) through the gas inlet nozzle (1), and is jetted through the opening (4) provided in the fraction plate (3). and ejects into a layer of particles (5). The particles (5) assume a fluid state due to this jet and effectively transfer heat to the heat exchange medium (b) flowing in the heat transfer tubes (6) embedded within the layer of particles. After completing the heat exchange, the waste gas whose temperature has decreased passes through the empty column section (7), flows out from the gas outlet nozzle (8), and is discharged into the atmosphere. Water is usually used as the heat exchange medium (b), and it evaporates in heat transfer tubes to become water vapor, which is used for process steam, power generation, and space heating.

Used to drive absorption refrigerators, etc. Alternatively, water may not evaporate in the heat transfer tubes and may simply leak water and be used for heating, hot water supply, etc.

In the prior art described above, the diameter of the apertures (4) in the dispersion plate (3) must be smaller than the diameter of the particles (5) in order to retain the layer of particles. The diameter of the particles is usually 05~2s+s+, but if the pores are smaller than this, the pores are likely to clog, and if some of the many pores become clogged, it will not be possible to obtain a good fluidity state of the particles. As a result, a problem occurred in that the heat transfer effect between the waste gas and the heat exchange medium was reduced.

[Purpose of the invention]

An object of the present invention is to provide a K-shaped dispersion plate that causes pores, which includes a wire mesh with a mesh size smaller than the diameter of the particles;
The object of the present invention is to solve the above-mentioned problems by using a dispersion plate consisting of a perforated plate having apertures having a diameter larger than that of the particles placed therebelow.

[Summary of the invention]

, the present invention has pores with a diameter larger than the particle size.
This is a dispersion plate for a fluidized bed heat exchanger consisting of a perforated plate and a wire mesh with a mesh size smaller than the above particle size.

〔Effect of the invention〕

According to the present invention, a favorable fluid state of particles can be maintained without causing a decrease in heat transfer performance.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3.

FIG. 2 shows a dispersion plate according to the present invention, which is composed of a perforated plate θU having openings αα having a diameter larger than the particle diameter, and a wire mesh a having apertures smaller than the particle diameter. FIG. 3 is a partial view of FIG. 2 viewed from above.

Here, the outer periphery of the wire mesh a3 is welded to a perforated plate all K (joint portion α3 in FIG. 112 and FIG. 3).

In the dispersion plate according to the present invention, since the wire mesh has the function of holding the particles, the aperture diameter of the perforated plate can be made larger than the particle diameter, and clogging of the apertures does not occur.

In addition, even if the wire mesh becomes partially clogged, the gas ejected from the openings can pass through the recess α4 between the protrusions and eject from the unclogged portion of the wire mesh. A good fluid state is maintained, and deterioration in heat transfer performance is avoided.

The dispersion plate according to the present invention shown in FIGS. 2 and 3 is composed of a perforated plate that can be easily manufactured by press working and an ordinary wire mesh that is widely available on the market, so it is particularly suitable for small mass-produced models. It is effective to apply to

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional fluidized bed heat exchanger, FIG. 2 is a diagram showing an embodiment of a distribution plate according to the present invention, and FIG. 3 is a partial view of FIG. 2 viewed from above. 10... Open hole 11... Perforated plate 12...
Chainlink (7317) Representative Patent Attorney Noriyuki Noriyuki (and 1 other person) W4211!1 1st cause

Claims (1)

[Claims] A dispersion plate for a fluidized bed heat exchanger, comprising a perforated plate having openings with a diameter larger than the particle size, and a wire mesh having a smaller opening than the particle size.