JPS59173626A - Fuel supplying device of fluidized bed combustion device - Google Patents

Abstract

PURPOSE:To supply the fuel under uniform grain size distributing condition over the whole surface of a combustion chamber by a method wherein a dispersing plate provided with a partition wall by which a fuel mixed gas can be dispersedly supplied into the combustion chamber is arranged at a fuel supplying part located on the upper part of a fluidized bed in the combustion chamber. CONSTITUTION:A dispersing plate 20 is arranged at a fuel supplying part formed on the upper part of a fluidized bed 10, the fuel supplying part supplies a fuel which is transferred into a combustion chamber 11a through a conveyer pipe 6 with a high speed injecting gas. The dispersing plates 20 are formed as both side parts thereof are made to be expanded gradually toward the outer direction from the entrance part 21, also arranged in tiers while being directed gradually downward to both side parts from the central part thereof. A partition wall 23 is formed between each stepped part, thereby, the uniform grain size distribution can be obtained over the whole surface of the fluidized bed 10 in the combustion chamber 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fuel supply device for supplying fuel to a combustion chamber in a fluidized bed combustion apparatus.

[Prior art]

Conventionally, as this type of fuel supply device, various structures are known as shown in FIGS. 1 to 3.
All of them have advantages and disadvantages, and no one has yet been proposed that can appropriately supply fuel to the combustion chamber with a simple configuration.

To explain this simply, in the device shown in FIG. 1, fuel 2 such as coal stored in a hopper 1 is sequentially sent in predetermined amounts to a fuel supply pipe 4 from an outlet 1a via a feeder 3. The supply pipe 4 is connected to a gas conveying pipe 6 into which a conveying gas, generally air, is blown from a blower 5.

The fuel 2 introduced into the conveying pipe 6 is mixed with the conveying particles, and is sequentially conveyed through the conveying pipe 6 by the high-speed jet stream.

Further, at the outlet of the conveying pipe 6, a distributor T and branch pipes 8m and 8 are provided for distributing the conveyed next fuel mixture gas in two directions.
A distribution section 9 is provided, which is made up of a plurality of stages (in this example, three stages) of ore and b. Note that 7A, 7B, and 7C in the figure indicate primary, secondary, and tertiary distributors, respectively. and,
The fuel 2 distributed in this distribution section 9 is uniformly supplied over the entire surface of the combustion chamber 11m from the bottom of the combustion device main body 11, which has a fluidized bed 10 made of crushed sand or the like as a fluidized medium formed inside the combustion chamber 11. It is structured so that it can be read.

However, in conventional devices with such a configuration,
Since the fuel 2 is mixed into a gas and supplied from the lower part of the combustion chamber 11a at a predetermined height, clogging is likely to occur in this raised part, and the distributor may be blocked. (7A, 7B, 7C) are used in large numbers, and the structure is not only complicated, but also a problem in terms of cost, and there is also a drawback that the pressure drop in the distributor of these is large.

Further, a distribution section 9 using the above-mentioned distributors 7A, 7B, and 7C
As shown in FIG. 2, a fluidized bed 10 is formed in the combustion chamber 11a.
Some devices are known in which the connection is made higher than the conventional one, but even with this configuration, many distributors are used, which poses problems in terms of structure, cost, and pressure loss.

Further, as shown in FIG. 3, a fuel supply section 12rF-spreader 1 provided above the fluidized bed 10 in the combustion chamber 11a
3 and by connecting the supply pipe 4 from the hopper 1 to the spreader 13, the fuel 2 is delivered to the combustion chamber by the rotating blades 13& of the spreader 13. There is also a known device that sprays the entire surface of the fluidized bed 10 in the la, but in such a spreader 13, the fuel 2 is
Fine particles are fed to the front side, and large particles are fed far away.9 As a result, the particle size distribution of the fuel 20 to the fluidized bed 10 is completely biased, and moreover, it is distributed downward, that is, toward the fluidized bed 10. Since the charging speed was low, many of the fine particles flew upwards into the combustion chamber 11 & before reaching the fluidized bed 10, which was a problem in terms of combustion efficiency.

[Summary of the invention]

The present invention has been developed in view of these circumstances,
It has an inlet section formed by the same plane, and its both sides are sequentially expanded outward and are formed downward in a step-like manner, and between each step section, the fuel mixture gas is introduced into the combustion chamber. A simple configuration in which a dispersion plate with a partition wall for distributing the supply is provided in the fuel supply section above the fluidized bed within the combustion chamber, to appropriately supply fuel with a uniform particle size distribution over the entire surface of the combustion chamber. [Embodiment] The present invention will be described in detail below using an embodiment shown in the drawings. This figure shows one embodiment of a fuel supply system for a floor smoldering device, and in this figure, the same or corresponding parts as in FIGS. 1 to 3 are given the same numbers and their explanations will be omitted. According to the present invention, as shown in FIGS. 5 to 7, a ttyc fuel supply section is formed above the fluidized bed 10 that supplies the fuel carried in the conveying pipe 6 by high-speed injection gas into the combustion chamber 11a. Dispersion plate 20
The dispersion plate 20IF distributes and supplies the fuel 2 carried by the dispersion plate 20IF in a desired direction, and distributes the fuel 2 to a desired particle size over the entire surface of the fluidized bed 10 within the combustion chamber 11. When configured to obtain a distribution, it has the F characteristic. This will be explained in detail with reference to FIGS. f'Lf
A branch channel 22a, 2 which has a flow portion 21 and through which the fuel mixture gas that flows in from this inflow portion 2° is distributed and distributed so as to spread in the vertical and horizontal directions within the combustion chamber 11i.
2h, . . . 22i are formed continuously. That is, the dispersion plate 20 is formed so that both sides of the dispersion plate 20 gradually expand outward from the inflow portion 21, and are formed in a step-like shape so as to sequentially point downward from the center toward both sides. ing. And, between each of these stage parts, each of the above-mentioned branch flow paths 22a, 22b, so as to guide the fuel mixture gas in a desired direction, respectively.
The partition wall 23 is formed to constitute...221.

Therefore, according to such a configuration, the fuel mixture gas that has flowed into the inflow portion 21 flows through each branch flow path 22a.

22b, ... 221 are divided equally at the inlet part and 1 each
The fuel is ejected from the outlet of these branch channels to spread in a desired direction within the combustion chamber 11JL, which can be easily seen from FIGS. 5 and 6:
be understood. In this way, the fuel 2 is uniformly distributed over the entire surface of the fluidized bed 10 within the combustion chamber 11a.
Particularly, according to the present invention, each of the branch channels 22a, 22b, . Since the particles reach the combustion chamber 11a while maintaining a velocity of 10, even fine particles can be injected at a velocity that can reach the fluidized bed 10, and the conventional problems such as scattering are solved.

Here, in the distribution plate 20 according to this embodiment, the branch flow path 22a
, 22i is on the outside in front, 22d, 22e,
22f is far from the center, 22b, 22c, 2
2g and 22h supply each branch flow between them.

It should be noted that the present invention is not limited to the structure of the embodiment described above, and it goes without saying that the shape of the dispersion plate 20 in particular can be modified as appropriate depending on the required fuel supply device.

〔Effect of the invention〕

As explained above, according to the present invention, the inflow portion is formed on the same plane, and both sides of the inflow portion are sequentially expanded outward and downwardly formed into step-like shapes, and each step has an inlet portion formed on the same plane. The dispersion plate, which has a partition wall between the sections that can supply the fuel mixture gas in a distributed manner within the combustion chamber, is installed in the fuel supply section above the fluidized bed within the combustion chamber, making it simple and economical. Despite the configuration, fuel can be properly supplied with a uniform particle size distribution over the entire surface of the combustion chamber,
It is possible to solve the conventional problem of clogging in the supply channel, scattering of fine particles, etc., and the effect is great.

[Brief explanation of the drawing]

1 to 3 are schematic configuration diagrams showing each side of a conventional fuel supply device, FIG. 4 is a schematic configuration diagram showing an embodiment of the fuel supply device according to the present invention, and FIG. 5 is a main part thereof. Enlarged view, No. 6
7 are a plan view and a front view of a dispersion plate that characterizes the present invention. 1φΦ・Hopper, 2@・φ・Fuel, 4-φψ supply pipe, 5・φ・Blower, 6・・Gas conveyance path, 10・・
... Fluidized bed, 11... Combustion device main body, 11a...
- Combustion chamber, 12...Fuel supply section, 20...Dispersion plate, 21...Inflow section, 22a, 22b,...22
i++...Diversion channel, 23, ψ book, partition wall.

Claims (1)

[Claims] A supply section is provided above the fluidized bed to mix fuel with high-speed jet gas and supply it into the combustion chamber, and the inlet has a second inlet section formed by the same plane, and both sides of the inlet section are arranged sequentially. A dispersion plate is provided which is formed in steps extending outward and sequentially downward, and is provided with a partition wall between each step to distribute and supply the fuel mixture gas. Fuel supply device for fluidized bed combustion equipment.