JPS6262120A - Fluidized bed incinerator - Google Patents

Abstract

PURPOSE:To promote agitation effect and make the transfer and discharge of incombustibles easier, by providing a discharge opening for incombustibles in the central part of a furnace, and providing a specific slitlike nozzle on a conical distributor plate which is downwardly inclined toward said discharge opening. CONSTITUTION:A discharge opening for incombustibles 13 is provided in the central part of a furnace and a conical distributor plate 11 having no projecting part, inclined downward toward said discharge opening 13, is provided. On said distributor plate 11, a large number of slitlike nozzles 12 through which dispersion air blows out nearly in a horizontal direction toward the center of the furnace are provided circumferentially between the center and the inside wall of the furnace. And openings of these slitlike nozzles 12 are made larger in size gradually as locations thereof comes closer to the center from the wall 10, allowing the blow off quantity of air to be increased as said nozzles are located closer to the discharge opening for incombustibles 13. In such a manner, a strong agitation accompanying swirling 17 is given to sand 15, the fluidized bed material, causing refuse having large particle size to be burnt completely, facilitating at the same time easier transfer and discharge of the incombustibles 14.

Description

[Detailed description of the invention] [Technical field of invention] This invention relates to a fluidized bed incinerator.

[Technical background of the invention and its problems]

In a fluidized bed waste incinerator, it is necessary to realize an active fluid state and to easily discharge incombustible materials.

Conventionally, there is one shown in FIG. 2, for example. In this method, a discharge port 3 for incombustible materials 4 and fluidized sand 5 is provided in the center of a horizontal dispersion plate 1, and an aeration nozzle 2 is provided protruding from the dispersion plate 1, at the top of the aeration nozzle. 5 tons of fluidized sand is agitated by the rise of air bubbles 6 by ejecting air diffused horizontally. However, in this method, (1) the fluidized sand 5 is not actively stirred because it is only caused by the uniform rise of air bubbles 6;

■ Since the dispersion plate 1 is horizontal and the fluidized sand 5 is not sufficiently stirred, the movement of the incombustible materials 4 toward the discharge port 3 is not smooth, so it is necessary to throw in the waste that has been crushed into small particles in advance. The power required for equipment such as reeds and crushers will increase.

- Since the aeration nozzle 2 protrudes from the dispersion plate 1, it obstructs the movement of non-combustible materials, and wire rods etc. tend to get tangled.

There are other problems.

Therefore, as shown in FIG. 3, there is a dispersion plate 1t with stones inclined downwardly toward the discharge port 3. It is said that swirling occurs in the fluidized sand 5 by increasing the amount of air diffused near the center of the furnace.
However, since the diffuser nozzle 2 protrudes in this case as well, the problem (2) remains.

Further, as shown in FIG. 4, the dispersion plate 1 is made into a mountain shape, and discharge ports 3, 3t are provided at the lower end portions of both sides of the slope, and a reflector plate is provided above the dispersion plate 1, and fluidized air is provided. There is one in which the amount of the flow is reduced in the center and increased on both sides to generate a swirling flow 7. In this case, the above-mentioned problems (2) and (2) are solved, but since there is a large protrusion called the reflector plate 8.8 in the flow section, there is a problem that this part is easily worn and the furnace shape becomes complicated. In this case as well, the diffuser nozzle protrudes, so the problem (2) remains.

The object of the present invention is to provide a fluidized bed incinerator that can solve the above-mentioned problems.

[Summary of the invention]

The fluidized bed incinerator of the present invention is a fluidized bed incinerator equipped with a non-combustible material discharge cap in the center of the furnace and a conical distribution plate that slopes downward toward the discharge port. The slit-shaped nozzles that blow out air in a substantially horizontal direction are arranged in multiple stages in the circumferential direction from the center of the entire furnace to the peripheral wall of the furnace. It is characterized by the fact that

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to all the drawings.

A non-combustible material discharge port 13 is provided in the center of the furnace.

A conical dispersion plate 11 that slopes downward toward the discharge port 13 is provided. This dispersion plate 1 has a slit-shaped nozzle 12 that blows out diffused air in a substantially horizontal direction toward the center of the furnace.
are arranged in multiple stages in the circumferential direction from the center of the furnace to the f-peripheral wall 10.

The opening of these slit-shaped nozzles 12 is located on the furnace peripheral wall 1.
It increases successively from 0 toward the center of the furnace.

Accordingly, in the present invention, the air discharge nozzle 12 facing the direction of the non-combustible material discharge port 13 is provided on the conical dispersion plate 11 which faces the non-combustible material discharge port 13 and is inclined downward, and the projections are formed on the upper surface of the dispersion plate 1. I made sure it wasn't there. Further, as the incombustible material discharge port 13 is approached, the total amount of air discharged is increased. These provide strong agitation accompanied by the swirl 11 to the fluidized sand 15, allowing large-sized particles to be completely combusted, and incombustible materials 14 to be easily moved and discharged.

Therefore, we conducted a comparative experiment with the one shown in Fig. 4, and found that although the swirling flow 7 was generated by the action of the reflector plate 80, the movement and discharge of incombustibles was poor due to the protruding aeration nozzle.
Incombustibles remained in the fluidized bed. On the other hand, according to the present invention, the swirling flow 17 is generated even without a reflector, and the incombustible material 14 flows on the inclined dispersion plate 11 without protrusions into the swirling flow 17.
It was confirmed that the air discharged from the nozzle 7 and the nozzle 12 moved quickly and was discharged very well.

〔Effect of the invention〕

The fluidized bed incinerator of the present invention as described above has the following effects.

1) Since the stirring effect is large, even large-sized garbage can be completely combusted, and the power required for the crusher, which is currently very large, can be reduced.

2) Since the movement and discharge of non-combustible materials is good, non-combustible materials do not accumulate in the furnace, and good fluidity and combustion conditions can always be achieved.

3) Since no reflector is required, the furnace shape is simplified.
Manufacturing and maintenance become easier.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the main part of the inventive furnace in a used state, and FIGS. 2, 3, and 4 are explanatory diagrams of different conventional fluidized bed incinerators. DESCRIPTION OF SYMBOLS 10...Furnace peripheral wall, 11...Distribution plate, 12...Slit-shaped nozzle, 13...Incombustible material discharge port. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2; 1,4 1X~5 Guan 3 Figure 4 Procedural Amendment Shoru 60. IJl, 11 [+ Commissioner of the Licensing Agency
Uga Michibe ) 1 ('n 1, Indication of the case, Patent Application No. 1988-201759 2, Name of the invention Fluidized Bed Incinerator 3, Person making the amendment Relationship to the case Patent applicant (412) Nippon Kokan Co., Ltd. 4. Agent address: 17th Office Building, 1-J'1426#5, Toranomon, Minato-ku, Tokyo 105 Phone: 03 (502) 31
81 (Long hole 1ri; i25, voluntary amended specification, content of amendment (1) The scope of claims is corrected as shown in the attached sheet. (2) Page 4, line 13, 20 of the specification "Conical dispersion plate" written in line 1 and from line 11 to line 12 is corrected to "dispersion plate." (3) Same as above, page 4, line 3, line 5, and page 6. The "slit-shaped nozzle" described in lines 15 to 16 is corrected to "nozzle." 2. Claims A non-combustible material discharge port is provided in the center of the furnace, and the incombustible material discharge port is directed downward toward the discharge port. In a fluidized bed incinerator equipped with a dispersion plate inclined at
A large number of nozzles for blowing diffused air in a substantially horizontal direction toward the furnace center are provided in the above-mentioned distribution plate in the circumferential direction from the furnace center to the furnace peripheral wall, and the openings of these nozzles are arranged in a direction from the furnace peripheral wall toward the furnace center. A fluidized bed incinerator characterized by a large granule.

Claims (1)

[Claims] In a fluidized bed incinerator equipped with a noncombustible material discharge port in the center of the furnace and a conical distribution plate that slopes downward toward the discharge port, air is diffused in a substantially horizontal direction toward the center of the furnace on the distribution plate. A fluidized bed incinerator characterized in that a large number of slit-shaped nozzles for blowing air are provided in the circumferential direction from the furnace center to the furnace peripheral wall, and the openings of these slit-shaped nozzles are gradually enlarged from the furnace peripheral wall toward the furnace center. .