JPS5941705A - Fluidized bed apparatus - Google Patents

Abstract

PURPOSE:To detect the height of a fluidized bed in reference to a variation in temperature in a direction of gravity at a thermal conducting part by a method wherein the thermal conducting part for conducting the fluidized bed temperature to an outer part is formed along the wall surface of the main body of the fluidized bed. CONSTITUTION:Spacer plates 7 and water pipes 6 are integrally formed to make a membrane structure of entire wall 5. The width of the partial spacer plate of a wall surface is wider than that of the other spacer plate so as to prevent a cooling effect caused by the water pipes at both sides from being applied to the central part of the spacer plate 7a. In the inside of the wall surface contacting with a fluidized bed 1, a refractory material layer 8 is removed along the spacer plate 7a. Thus, fluidized bed medium forming the fluidized bed 1 is directly contacted to the spacer plate 7a at the thermal conducting part 9, and the heat at the fluidized bed 1 is conducted to the outside. A sensing of temperature at the thermal conducting part 9 is performed with a plurality of thermocouples arranged at the thermal conducting part 9 and as shown it may easily be performed with an infrared rays photographing device 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluidized bed apparatus, and more particularly to a fluidized bed apparatus capable of accurately detecting the bed height of a fluidized bed formed therein.

Devices using fluidized beds are used as various reaction devices and combustion devices. Among these, to explain the case where it is used as a combustion device using Fig. 1 as an example, fluidizing gas (combustion air) is supplied to a fluidized bed 1 formed by fluidizing a medium such as sand. Since the fuel (incineration material) 2 is burned while being mixed and stirred with the fluidized medium, even relatively flame-retardant substances can be burnt well. For this reason, fluidized bed combustion equipment is garbage.

Its capabilities are attracting attention in various fields, including incineration of waste such as dehydrated sludge. This is true not only as a combustion device, but also in fields where it is used as a reaction device, such as in coal gasification reactions, and its ability to promote reactions is attracting attention. In this case, in order to perform combustion or reaction well within the bed, it is necessary to sufficiently control the bed height of the fluidized bed and to mix and stir the fuel (reactant) well. However, the fluidized bed itself is high temperature, and the device main body 3
It was difficult to detect the layer height due to the thick fireproof structure of the walls. For this reason, conventional methods have been used to indirectly measure the bed height by, for example, measuring the pressure loss of the fluidizing gas A supplied into the air chamber 4, but the error is quite large and is not a practical problem. There is.

An object of the present invention is to eliminate the above-mentioned problems and provide a fluidized bed device that can accurately measure the bed height of the fluidized bed formed within the device.

In short, this invention forms a heat transfer part on a part of the wall surface of the main body of the fluidized bed apparatus, which transmits the temperature inside the bed to the outside along the direction of gravity. This is a fluidized bed device configured to be able to detect the bed height of a fluidized bed.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 2 and 3, reference numeral 5 indicates an example of a wall structure forming a wall of the fluidized bed apparatus.

Reference numeral 6 indicates a water pipe through which water supply passes, and reference numeral 7 indicates an intervening plate called a membrane bar interposed between these water pipes 6 arranged in parallel. has a membrane structure.

The width of some of the intervening plates on this wall surface is made larger than the width of other intervening plates (indicated by reference numeral 7a), so that the cooling effect of the water pipes on both sides does not reach the center of this intervening plate 7a. I'll keep it. Next, a refractory material layer 8 is formed on the inner side of the wall surface in contact with the fluidized bed 1 as shown in FIG.
The heat transfer portion 9 is formed by removing the refractory material layer 8 along the layer height direction, that is, the direction of gravity, centering on the central portion of a.

In the above apparatus, the fluidized medium forming the fluidized bed 1 directly contacts the intervening plate 7a in the heat transfer section 9, as shown in FIG. 4, and directly transfers the heat of the fluidized bed 1 to the outside.

Considering the temperature distribution inside the fluidized bed device when it is used as a combustion device, the temperature of the fluidized bed 1 is about 8
50°C, and the temperature of the empty column 10 near the surface of the fluidized bed 1 is generally about 800°C. Further, in the fluidized bed 1, the red-hot fluidized medium is in direct contact with the object to be heated, so that the heat transfer rate reaches 4 to 5 times that of the empty column part 10. Therefore, there is a clear difference in the metal temperature of the intervening plate 7a of the heat transfer part 9 between the part that contacts the fluidized bed 1 and the empty column part.

Therefore, by measuring the metal temperature distribution in the heat transfer section 9, the height of the fluidized bed 1 can be accurately detected from the outside.

The temperature of the heat transfer section 9 may be detected by arranging a plurality of thermocouples at 4 degrees with respect to the heat transfer section 9, or alternatively, an infrared imaging device 11 shown in FIG. 4 may be used.

This device transmits a thermal image signal corresponding to the amount of infrared rays emitted from the object and displays the temperature distribution as an image on an image display device such as a color television. can be accurately and easily determined. Also,
If the thermal conductivity of the intervening plate 7a is known, the temperature itself of the fluidized bed 1 can be calculated from the metal temperature of the intervening plate 7a.

Furthermore, in the above case, the wall surface of the apparatus has a membrane structure, but the structure is not limited to this, and the heat transfer coefficient for a part of the wall surface is such that the temperature difference between the empty column part and the fluidized bed part can be detected. The object of the present invention can be achieved by configuring it to increase.

By implementing this invention, the bed height of the fluidized bed can be easily and accurately measured from outside the apparatus.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a fluidized bed apparatus, FIG. 2 is a partial front view of a wall surface of a fluidized bed apparatus according to the present invention, FIG. 3 is a sectional view taken along line I-I in FIG. 2, and FIG. FIG. 2 is a cross-sectional view taken along line nn of FIG. 1...Fluidized bed 5...Device wall surface 6
...Water pipes 7, 7a... Groaning interposition plate 8...
... Refractory material layer 9 ... Heat transfer part 10 ...
...Soratobe 11...Patent attorney representing infrared imaging device Oka 1) Gobebe

Claims (1)

[Scope of Claims] 1. A heat transfer section having a thermal conductivity capable of transmitting and detecting the temperature difference between at least the fluidized bed section and the empty column section to the outside is provided on a part of the wall surface constituting the main body of the apparatus. Formed almost in the direction of gravity,
A fluidized bed device characterized by measuring the bed height of the fluidized bed by detecting the temperature distribution in the heat transfer section. 2. The wall surface has a membrane structure consisting of a water pipe and an intervening plate, and a part of each intervening plate is made into a wide intervening plate, and a part that is less affected by the cooling effect of the water pipes located on both sides is formed on this wide intervening plate. , and in the direction of gravity, the thickness of the refractory layer inside the furnace is reduced or the refractory layer is removed so that the height of the layer inside the furnace can be detected with the intervening plate. The fluidized bed apparatus according to scope 1. 3. The fluidized bed apparatus according to claim 1 or 2, wherein the temperature distribution in the heat transfer section is measured using an infrared imaging device.