JPS6029508A - Fluidized bed layer type incinerator - Google Patents

Abstract

PURPOSE:To make the height of a furnace low, by deviating the center line of a fluidized bed layer part and that of a free board part from each other in a fluidized bed layer type incinerator. CONSTITUTION:A fluidized bed incinerator 10 has an inclined ceiling 4 and an inclined wall 5 in the lower part of a furnace. The center lines L1 and L2 of a free board part 1 and of a fluidized bed layer part 2 are designed so as to be deviated from each other. By this arrangement, the height h' of a furnace can be lowered. In addition, scattered sand rebounds against the inclined ceiling 4, so that heat can quickly be reduced from the free board.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a fluidized bed incinerator. In conventional fluidized bed incinerators, the center line of the fluidized bed and the center line of the freeboard part were on the same line. Therefore, in order to increase the volume of the freeboard section,
The only option was to increase the height, increase the diameter of the furnace, or increase the length and width, but this was due to the phenomenon of sand bumping caused by the bursting of large bubbles that coalesced inside the fluidized bed. , there was a tendency to increase the free board. Therefore, when an incinerator is installed indoors, it is necessary to make the building higher, which has the disadvantage of increasing the construction cost of the incineration facility. In addition, in the case of a fluidized bed incinerator, sand jumps up onto the freeboard due to bumping, is heated by the freeboard, and then falls down.

This has the effect of raising and maintaining the temperature of the fluidized bed, but if the freeboard is high, the cycle from when it jumps up until it falls down is long (and the heat from the freeboard tends not to be returned quickly). be.

This tendency is particularly noticeable during start-up, and there is a drawback that it takes time for the temperature of the fluidized bed section to stabilize.

Also, if a hot water generator or steam boiler radiant section is installed above the freeboard, the heat transfer tubes will wear out due to flying sand, so either use heat transfer tubes made of wear-resistant high-grade materials, or install a hot water generator installed separately. Usually, it is a boiler or a waste heat boiler.
The disadvantage was that construction costs were high.

This invention is intended to eliminate all the drawbacks of the conventional fluidized bed incinerator, and makes it possible to lower the height of the furnace by eccentrically centering the center lines of the fluidized bed section and freeboard section of the fluidized bed incinerator. It is.

Figure 1 shows a conventional fluidized bed incinerator.
The center line of the 7-lead board 1 and the center line of the fluidized bed 2 coincide and are indicated by L. 3 indicates the exhaust gas outlet and the blowing direction of the flowing air. As mentioned above, in this conventional incinerator, the height h of the furnace is increased.

Figure 2 shows the same example of a conventional incinerator;
A steam boiler radiant section 21 is provided above the freeboard section 1 and is connected to the steam boiler 20 through a pipe 22. In such a configuration, the heat exchanger tubes are subject to wear due to the flying sand in the freeboard 1, so it is necessary to use heat exchanger tubes made of high-quality wear-resistant material.

FIG. 3 shows an embodiment of the incinerator of the present invention, showing the center line Ll of the freeboard section 1 of the fluidized bed incinerator 100 and the fluidized bed section 2.
The center iLz of the furnace is eccentric, and the furnace has a sloped ceiling 4 and a lower sloped wall 5. Note that 3 is the exhaust gas outlet, and a is the flowing air blowing direction, as in the case of FIG. 1.

With this invention, the height h' of the furnace can be reduced,
Further, the scattered sand bounces off the sloped ceiling 4 and does not reach the upper part of the free board, so that heat can be quickly returned from the free board. In the figure, the slope θ of the sloped ceiling is preferably in the range of 45° to 60° in consideration of sand splashing. The slope θ' of the lower inclined wall 5 is preferably 40' to so' to prevent sand from accumulating thereon.

FIG. 4 shows a case where the incinerator 10 and the steam boiler 2o are installed side by side, and the center line L1 of the 7-liquid board part 1 of the incinerator 1o and the center line L1 of the fluidized bed part 2 are eccentric. The boiler radiation section 21 is provided above the freeboard section.

3#'i is an exhaust gas outlet, a is an air blowing direction, and 5 is a lower inclined wall. In this embodiment, the flying sand bounces off the sloped ceiling 4, so the upper boiler radiant part does not wear out, and there is no need to use heat exchanger tubes made of high-grade materials.

The incinerator of the present invention has such a configuration, and by making the center line of the main flow part and the center line of the free board part eccentric, the height of the incinerator can be lowered, and scattering on the sloped ceiling part can be reduced. By colliding and falling the sand, the heat from the Schifley board can be quickly returned, creating a highly efficient combustion state.

Furthermore, a hot water generator or a radiant section of a steam boiler can be installed above the freeboard section without using heat transfer tubes made of wear-resistant high-grade materials. As described above, this invention has brought about a number of great effects, such as reducing the construction cost of incinerators and increasing the efficiency of incinerators.

[Brief explanation of the drawing]

1 and 2 are views showing a conventional incinerator, FIG. 3 is a view showing an incinerator according to the present invention, and FIG. 4 is a view showing another embodiment. Explanation of symbols 1...Freeboard 2...Fluidized bed 5...Exhaust gas outlet 4...Slanted ceiling 5...Lower sloped wall 10.
...Incinerator 22...Connecting pipe (5 other people) Figure 1 Figure 1 Figure 2 Figure 4

Claims (1)

[Scope of Claims] 1) A fluidized bed incinerator characterized in that the center line of the fluidized bed and the center line of the freeboard part are eccentric. 2) The fluidized bed incinerator described in the patent, characterized in that it has a hot water generator above the freeboard section. 3) The fluidized bed incinerator according to claim 1, further comprising a steam boiler radiant section above the freeboard section. 2. The fluidized bed incinerator according to claim 1, wherein the 7-board portion has a sloped ceiling.