JPS603122B2 - Fluidized bed heat transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluidized bed heat transfer device, and more particularly to a heat transfer device in a fluidized bed combustion vessel.

Conventionally, the installation position of the transfer pipe that transfers the heat generated by the combustion phosphorus in the fluidized bed in the fluidized bed combustion vessel has generally been primarily aimed at simply being buried within the bed. As a result, while the advantage is that a large amount of heat is transferred with a high heat transfer coefficient when the bed is fluidized, if you want to change the heat transfer load to a small value, you have to lower the bed temperature or change the medium in the bed. The only option was to extract the heat to the outside and lower the height of the layer, which had the disadvantage of not being able to easily change the heat transfer load.

The object of the present invention is to improve the drawbacks of the conventional fluidized bed combustion apparatus as described above, and to reduce the ring heat fence load without changing the bed temperature or withdrawing and returning the internal medium. To provide a fluidized bed heat transfer device that can be easily changed.

The present invention is directed to a fluidized bed civil heating system in which the bed height change phenomenon peculiar to the fluidized bed, that is, the bed height at rest during non-fluidization is low;
The bed height during expansion during fluidization becomes higher, and the ratio of the heights between the two is 1:1.3 and 1:1. Utilizing the observed phenomenon of rising stars, the installation height of the 6 poison heat tubes is set so that they are exposed outside the eyebrows when non-liquid, and are installed so that they are buried within the pipe when fluid. That is. For this purpose, it is sufficient that the 6 poison heat tubes are installed in the fluidized bed container above the dispersion plate so that they are within the range of the height of the bed during non-fluidization and the height of the bed during fluidization. It is. According to the structure of the heat transfer device of the present invention, it is possible to perform the heat transfer with a simple operation without the inconvenience of dealing with changes in the thermal energy load as in conventional devices.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings in terms of embodiments and in comparison with conventional examples.

In conventional fluidized bed combustion, a distribution plate 3 is provided, and the fluidizing fluid is directed in the direction indicated by the arrow 5, as shown in the illustrative diagram of FIG.
The transfer tube 4 provided in the fluidized bed combustion vessel 1 which is configured to feed the medium as shown in FIG.

That is, the media layer 2 is installed so that it is always within the layer, whether it is at rest when it is non-fluidized or when it is expanding when it is fluidized. Therefore,
When the bed is fluidized, it has the advantage of generating a large amount of heat, but in order to reduce the ring heat load, it is necessary to lower the bed temperature or to lower the height of the bed by extracting the medium inside the bed to the outside. Therefore, it was not possible to easily change the heat transfer load. An embodiment of the present invention will be described with reference to FIGS. 2 and 3. Reference numeral 1 is a fluidized bed combustion vessel, 2 is a medium bed, and heat transfer tubes 4 are connected to As shown in FIG. 2, the stationary layer is placed at a higher level than the height A with respect to the dispersion plate 3 and exposed to the outside of the waste, and when the layer expands during fluidization, as shown in FIG. 3. Note that the expansion layer is installed at a position lower than the height B of the expansion layer with respect to the dispersion plate 3 so as to be buried within the layer.

In other words, the transfer tube 4 is installed so that the height from the distribution plate is above A and below B. Therefore, in combustion using such a device, when the layer 2 is non-fluidized and stationary, the heat transfer tubes 4 are outside the layer, so the heat transfer at that time is based on non-fluidized bed heat transfer. It's noticeably smaller.

On the other hand, when the fluidizing fluid 5 is fed into the medium layer 2 from the dispersion plate 3 as shown in FIG. At this point, the ear tube 4 comes into contact with the fluidized bed, so the amount of ripening increases significantly. In this way, in the present invention, by installing the heat exchanger tubes 4 between the non-fluidized bed height indicated by A and the fluidized bed height indicated by B, the following items, '｝、'.', the effects listed above are demonstrated. {i' The method of changing the ring heat load is simplified.

'o- Therefore, it can respond to the demands of rapid change. Shiichi
The heat transfer pupil load ratio when the civil heating pipe is exposed outside the layer and when it is buried in the layer is about 1:5, but by adjusting the layer height and superficial velocity,
By setting an appropriate height between the two, it is possible to set the propagation load amount to a desired value. As is clear from the above explanation, the effects of the present invention are extremely large.

[Brief explanation of drawings]

Fig. 1 is an illustrative diagram of a subordinate example, Fig. 2 is an illustrative diagram of an embodiment of the present invention when the fluidized bed is non-fluidized, and Fig. 3 is when the fluidized bed of Fig. 2 is fluidized. It is an illustrative diagram of the time. DESCRIPTION OF SYMBOLS 1...Fluidized bed combustion vessel, 2...Medium layer, 3...Dispersion plate, 4...Heat transfer tube, 5...
... Fluidization fluid, A... Bed height when non-fluidized, B...
...Bed height during fluidization. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A heat exchanger tube is installed in a fluidized bed combustion vessel at a position where it is exposed outside the bed when the bed is non-fluidized and is buried within the bed when the bed is fluidized. Fluidized bed heat transfer device. 2. A patent claim in which the heat exchanger tubes are installed in a fluidized bed combustion vessel within a range between the height of the bed at the time of non-fluidization and the height of the bed at the time of fluidization above the distribution plate. The fluidized bed heat transfer device according to item 1.