JP2955068B2 - Fluidized bed combustion furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidized bed combustion furnace applied to an industrial fluidized bed boiler or a waste incinerator using a fuel containing foreign matter.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a waste tire combustion apparatus as an example of a conventional fluidized bed combustion furnace. In the figure, 1 is a fluidized bed combustion furnace, 4 is an air chamber provided at a lower part of the combustion furnace, 10 is an air supply pipe for supplying air to the air chamber, and 3 is an upper part of the air chamber. Numeral 5 denotes a fuel supply device provided in the upper part of the combustion furnace, numeral 2 denotes a fluidized bed formed in the combustion furnace, and numeral 6 denotes a pipe for extracting foreign matters extending downward from the combustion furnace.

In this apparatus, a fuel supply device 5 is provided on the upper side of the fluidized-bed combustion furnace 1, and the fuel (for example, a finely cut waste tire or the like containing foreign matters such as wires and metal cloth) is included. ) Is quantitatively charged above the fluidized bed 2 by a screw feeder or the like. At the lower part of the fluidized bed 2, an air distribution plate 3 provided with a foreign matter extraction pipe 6 on the slightly inclined lower side is provided, and the lower part thereof forms an air chamber 4, and air is supplied from an air supply pipe 10. The fuel is supplied as flowing air and combustion air, whereby the fuel undergoes flowing combustion in the furnace. The foreign matter slides down along the inclination of the air distribution plate 3 and is discharged from the foreign matter extraction pipe 6.

[0004]

In a conventional fluidized bed combustion furnace, foreign substances contained in the fuel are settled in the whole of the fluidized bed, and a part thereof flows. In the case of waste tire combustion equipment,
It is a foreign substance that sinks or flows a wire or metal cloth contained in a tire. If the heat transfer tube is installed in the fluidized bed, the above-described foreign matter flows while clinging to the heat transfer tube, and thus the heat transfer tube is worn or the heat transfer is hindered. Therefore, conventionally, a heat transfer tube cannot be installed in the fluidized bed.

An object of the present invention is to provide a fluidized bed combustion furnace in which heat transfer tubes can be installed in the fluidized bed by removing foreign matter from the fluidized bed in order to control the furnace temperature. is there.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In a fluidized-bed combustion furnace using a fuel mixed with non-combustible foreign matter such as wire or stone, a heat transfer tube is provided in the fluidized bed. arrangement, and the inclined partition wall separating the fluidized bed vertically above the same heat transfer tube provided in the partition wall is fluidized material can pass through the foreign matter is formed in dimensions that can not be passed, and the width of the upper
The present invention relates to a fluidized bed combustion furnace, wherein slits having narrow sides and wide bottom sides are arranged in a zigzag pattern on the entire surface .

[0007]

The partition provided above the heat transfer tube separates the fluidized bed up and down, but the fluidized material can freely flow above and below the fluidized bed by the slits provided in the partition. And this slit ,
It is formed in dimensions but flowing material can pass through the foreign matter can not pass
The width of the partition is narrow at the top and wide at the bottom.
The fluid material is placed in a zigzag pattern on the
Can flow freely through the partition wall, but the foreign matter does not settle below the partition wall, is separated from the flowing material, and is carried along the slope of the partition wall to a discharge pipe for discharging the foreign matter and discharged. As a result,
In this type of boiler, it is possible to prevent abrasion of the heat transfer tube due to foreign matter and foreign matter sticking to the heat transfer tube, which is a problem,
The arrangement of the heat transfer tube in the fluidized bed becomes possible.

[0008]

FIG. 1 is a sectional view of an embodiment of a fluidized bed combustion furnace according to the present invention. In the figure, 7 is a partition wall with a slit provided in the fluidized bed according to the present invention, and 8 is a heat transfer tube in the bed also provided in the fluidized bed. The partition wall with a slit is provided at a position where the fluidized bed is divided into upper and lower parts, and the lower end thereof is connected to the foreign matter extraction pipe 6. In-layer heat transfer tube 8
Is provided between the partition wall with slit 7 and the air distribution plate 3. The other parts are the same as in the prior art.

FIG. 2 is a partially enlarged plan view of the partition wall with a slit, and FIG. 3 is a sectional view taken along the line AA of FIG. In the figure, 9
Is a slit. As shown in the figure, the width of the slit 9 is narrow (3 mm) on the upper side and wide (5 mm) on the lower side, and the length is 20 to 30 mm. The direction is parallel to the direction of the inclination. Yes, they are arranged in a staggered pattern on the entire wall.

In the combustion furnace, the in-bed heat transfer tube 8 absorbs heat in the fluidized bed 2 to desulfurize the inside of the fluidized bed and reduce the NO
x and the most suitable temperature for combustion (800-900
℃). The partition wall 7 with slits provided above the in-layer heat transfer tube 8 prevents foreign substances in the fuel supplied from the upper part of the furnace from moving downward. The foreign matter moves along the slope of the partition 7 and is discharged from the foreign matter extraction pipe. Fuel and fluid material particles can freely move up and down through the slits 9 provided in the slit-equipped partition walls 7 and burn.

As described in detail above, in the fluidized-bed combustion furnace of the present embodiment, the heat-transfer tube is not installed in the fluidized-bed because the partition wall with the slit eliminates the risk of abrasion of the heat-transfer tube due to sticking of foreign matter. This makes it possible to maintain the inside of the furnace at an optimum combustion temperature, and to increase the load of the fluidized bed combustion furnace.

[0012]

According to the fluidized bed combustion furnace of the present invention, a heat transfer tube is disposed in the fluidized bed, and an inclined partition wall is provided above the heat transfer tube so as to vertically separate the fluidized bed. Is formed so that it can pass
The width of the partition is narrow at the top and wide at the bottom.
Are arranged in a zigzag pattern on the surface so that foreign substances can be
To prevent the foreign matter from clinging to the heat transfer tube.
Therefore, the heat transfer tube can be installed in the fluidized bed, and the temperature in the furnace can be appropriately adjusted.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of a fluidized bed combustion furnace of the present invention.

FIG. 2 is a partial plan view of a partition with a slit used in the embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view of a conventional fluidized bed combustion furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluidized bed combustion furnace 2 Fluidized bed 3 Air dispersion plate 4 Air chamber 5 Fuel supply device 6 Foreign matter extraction pipe 7 Slit partition wall 8 In-layer heat transfer pipe 9 Slit 10 Air supply pipe

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23C 11/02 F23G 5/30

Claims (1)

(57) [Claims] 1. A fluidized bed combustion furnace using fuel mixed with non-combustible foreign matter such as wire or stone. A heat transfer tube is arranged in the fluidized bed, and the fluidized bed is inclined above and below the heat transfer tube so as to vertically separate the fluidized bed. A partition is provided, and the partition is formed in such a size that the flowable material can pass therethrough but foreign matter cannot pass through , and the width thereof is on the upper side.
A fluidized bed combustion furnace characterized by having narrow slits with wide bottoms arranged in a zigzag pattern on the entire surface .