JPS60240911A - Fluidized-bed furnace for waste - Google Patents

Abstract

PURPOSE:To provide a fluidized-bed furnace for waste in which sand and the like is smoothly fluidized, the air is excellently dispersed, and which can be continuously operated, by a method wherein, instead of a hopper, a slanted plate, gently sloped, is installed, and an air hole is formed in the slanted plate and a covering body is provided thereto. CONSTITUTION:A waste B is charged in a fluidized-bed furnace body 2 through the working of a waste feeder 6 for combustion. Its residue and sand A are gradually moved along a slanted plate 3 through operation of a sand discharger 9, and is discharged through a chute 8 toward a vibration sieve 10. By means of the vibration sieve 10, the residue is separated from the sand A, the residue is discharged to the outside, and the sand A is returned to the fluidized-bed furnace body 2 through a sand return pipe 12 by means of a bucket conveyor 11. Meanwhile, the air is fed in a wind box 13 through a feed pipe by means of a forced fan ventilator, and is injected in the fluidized- bed furnace body 2 through an opening 15 of a covering body 5 by means of an air hole 4 to promote combustion of the waste B. Since an object, impeding fluidization of the sand A and the like, is absent at the interior of the fluidized-bed furnace body 2, the sand A is smoothly fluidized, and the sand A is prevented from entering the wind box 13 through the air hole 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvement of a waste fluidized furnace used for incineration of general municipal waste, industrial waste, and the like.

(Prior Art) Conventionally, general municipal waste, industrial waste, etc. have been incinerated in a waste incinerator equipped with a stoker.

However, as synthetic polymer products are becoming more common in garbage and other waste, if such materials are burned on a stoker, the stoker may burn out due to the high temperature. As well as increasing clinker trouble due to melting of ash,
The problem was that the problems of HCJ and NOx were also increased.

Therefore, in recent years, waste has been incinerated using a fluidized bed furnace.

In general, a fluidized bed furnace has a temperature within the fluidized bed of 700°C to 800°C.
Since the temperature is kept as low as ℃, clinker trouble can be prevented and NOx can also be reduced.

However, it does not use a movable body like a stalker, and
By adding calcium carbonate, dolomite, etc. to the fluidized bed, HC1! can prevent the occurrence of

Therefore, the waste fluidized fluidized furnace 30 using such a fluidized fluidized furnace is
For example, as shown in FIGS. 6 and 7, the fluidized furnace main body 31
, a hopper 32, a waste feeder 33, a sand discharger 34, a vibrating sieve 35, a packet conveyor 36, a sand return pipe 37, a gas discharge duct 38, an air supply pipe 39, etc. The hopper 32 contains sand A that becomes a fluidized bed.

Waste B is fed into the fluidized bed furnace body 31 by the waste feeder 33 and burned, and its residue and sand A are gradually transferred to the vibrating sieve 35 via the hopper 32 by the operation of the sand discharger 34. The sand is separated into residue and sand by the vibrating sieve 35, and the residue is discharged to the outside, while the sand is returned to the fluidized bed furnace main body 31 via the sand return pipe 37 by the packet conveyor 36.

Air from a forced draft fan (not shown) is supplied to the air supply pipe 39 via a main pipe 40 and ejected from its diffuser nozzle 41 to promote combustion of the waste B.

However, in such a waste fluidized fluidized furnace 30, since the air supply pipe 39 equipped with the aeration nozzle 41 is provided to penetrate the inside of the fluidized fluidized furnace main body 31, the wires and the like in the waste B are Foreign matter C such as coarse non-combustible matter was wrapped around or bridged around the air supply pipe 39, greatly hindering the flow of the residue and sand A.

For this reason, in the past, a worker had to periodically enter the fluidized bed furnace main body 31 to remove it.

1. However, such removal work is problematic because it requires a considerable amount of time and effort, and is also unsanitary and dangerous.

(Problems to be Solved by the Invention) The present invention was devised in order to solve the above-mentioned problems, and its purpose is to ensure smooth flow of sand, etc. It is also an object of the present invention to provide a waste fluidized fluidized furnace that can perform good aeration and can be operated continuously.

(Means for Solving the Problems) The waste fluidized fluidized furnace of the present invention includes a fluidized fluidized furnace body containing sand,
A sloped plate provided at the bottom of the fluidized furnace main body that slopes gently downward, an appropriate number of air holes drilled in the sloped plate, and a sloped plate provided on the top surface of the sloped plate to cover each air hole with a sloped downward side. It is characterized by having an open cover.

That is, the air supply pipe that penetrated through the fluidized bed furnace body was eliminated, and the hopper was replaced with a gently sloped plate, and this sloped plate was provided with air holes and a cover.

(Function) The waste supplied into the fluidized bed furnace body is burned, and its residue and sand flow downward and move along the inclined plate before being discharged.

Air is supplied from the air holes through the openings in the cover and into the fluidized bed furnace body to promote combustion of the waste.

(Example) Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional front view showing the structure of a waste fluidized furnace according to an embodiment of the present invention. FIG. 2 is an enlarged longitudinal sectional front view of the vicinity of the air hole. FIG. 3 is a perspective view showing the shape of the cover.

The waste fluidized fluidized furnace 1 includes a fluidized fluidized furnace main body 2, an inclined plate 3, and an air hole 4.
, the main part is composed of the covering body 5.

The fluidized furnace main body 2 contains sand A, and is provided with a waste feeder 6 on the upper side and a gas discharge duct 7 on the upper side.

The inclined plate 3 is provided at the lower part of the fluidized bed furnace main body 2 and is gently inclined downward. In this example, there are inclined plates 3 on the left and right sides, and the inclined plates 3 are gradually lowered so that the center is lowered.

A chute 8 is connected to the lowest part of the inclined plate 3, and a sand discharger 9 is provided at the bottom of the chute 8.

A vibrating sieve 10 is disposed at the next stage of the sand discharger 9, and a packet conveyor 11 is connected to this, and a sand return pipe 12 is connected to the packet conveyor 11 and the middle part of the other side of the fluidized bed furnace body 2. Intervention is provided.

An appropriate number of air holes 4 are formed in the inclined plate 3 and are provided at predetermined intervals.

A wind box 13 is provided below the inclined plate 3, and a forced draft fan (not shown) is connected to this through a supply pipe 14.

The cover 5 is provided on the upper surface of the inclined plate 3 to cover the air holes 4, and has an opening 15 at the lower inclined side.

In this example, the steel plate is bent into a v shape to have a triangular cross section.
This is welded to the inclined plate 3.

Incidentally, the inclination angle α of the ridgeline of the cover 5 and the inclination angle θ of the inclined plate 3
It is desirable that α≦0, and it should not be placed above the horizontal. In this way, foreign objects and the like will not get caught and will move smoothly.

In addition, the air hole 4 and the opening 15 of the cover 5 have an angle of repose β of the sand A.
(In other words, the maximum inclination angle at which the slope will be stable without collapsing when sand is piled up in a pyramid shape). This prevents sand A from entering the air holes 4.

Next, the operation will be explained based on such a configuration.

Waste B is fed into the fluidized bed furnace body 2 by the waste feeder 6 and burned, and its residue and sand A are gradually moved along the inclined plate 3 by the operation of the sand discharger 9. It is discharged from the chute 8 towards the vibrating screen 10.

The vibrating sieve 10 separates the residue into sand A, and the residue is discharged to the outside, while the sand A is returned to the fluidized furnace body 2 via the sand return pipe 12 by the packet conveyor 11.

On the other hand, air is supplied from the forced draft fan to the wind box 13 via a supply pipe.
and is ejected from the air hole 4 through the opening 15 of the cover 5 into the fluidized bed furnace body 2 to promote combustion of the waste B.

Inside the fluidized bed furnace body 2, there is nothing that impedes the flow of the sand A, etc., so it flows smoothly, and the sand A etc. flows through the air holes 4.
There is no way to enter the wind box 13 through the process.

In the previous embodiment, the chute 8, the sand discharger 9, the vibrating sieve 10, the packet conveyor 11, and the sand return pipe 12 remove the residue and sand A.
Sand is sorted and Sand A is sent back.
The method is not limited to this, and the separation and return of the sand can be carried out by any appropriate means.

In the previous embodiment, two inclined plates 3 were provided to form a V-shape, but the present invention is not limited to this, and it is also possible to use one inclined plate 3 as shown in FIG. 4, for example.

In the previous embodiment, the cover 5 has a triangular cross section, but is not limited to this, and may have a semicircular cross section, for example, as shown in FIG.

(Effects of the Invention) As described above, according to the present invention, the following excellent effects can be achieved.

(1) Since there is nothing inside the fluidized bed furnace that obstructs the flow of sand, etc., the flow of sand, etc. is extremely smooth.

(2) Since an inclined plate is provided at the lower part of the fluidized furnace main body and air holes are bored in the inclined plate, uniform and good air diffusion can be achieved.

(3) Since a cover is provided to cover the air holes, sand, etc. will not enter the air holes and deteriorate the air diffusion performance.

(4) Since foreign objects such as wires and coarse non-combustible materials are also smoothly flowed, there is no need to periodically remove them, and continuous operation is possible.

(5) The structure is relatively simple and can be easily implemented.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing the structure of a waste fluidized furnace according to an embodiment of the present invention. FIG. 2 is an enlarged longitudinal sectional front view of the vicinity of the air hole. FIG. 3 is a perspective view showing the shape of the cover. FIG. 4 is a longitudinal sectional front view of main parts showing another embodiment of the inclined plate. FIG. 5 is a perspective view showing another embodiment of the cover. FIG. 6 is a longitudinal sectional front view showing the structure of a conventional waste fluidized reactor. FIG. 7 is a longitudinal sectional side view of the main part. 1... Waste fluidized fluidized furnace 2... Fluidized fluidized furnace main body 3... Inclined plate 4... Air hole 5... Cover etc. 1 person

Claims (1)

[Claims] A fluidized bed furnace body containing sand, a sloped plate provided at the bottom of the fluidized furnace body and gently sloped downward, an appropriate number of air holes drilled in the sloped plate, and a sloped plate to cover each air hole. What is claimed is: 1. A fluidized waste furnace, comprising: a cover provided on the upper surface of the furnace and having an open sloped downward side;