JPS5816116A - Furnace for indeterminate solid fuel - Google Patents

Abstract

PURPOSE:To prevent an incomplete combustion caused by a temporary production of surplus volume of volatile material by a method wherein an upper area over fire bars is made a firing layer of solid fuel, a lower area of the fire bars is formed with a primary combustion chamber for use in burning volatile constituent of the solid fuel, thereby a range of firing layer is restricted. CONSTITUTION:Wooden materials, bagasse, and chips of used type etc. are fed as a fuel at a fuel feeding port 1 into the fuel storage chamber 5 over the fire bars 4, the indeterminate solid fuel is burnt while air is fed from the blowing port 6 to the area just above the fire bars 4 to form the firing layer 8, the storing chamber 5 is always kept at a condition of oxygen shortage to prevent an expansion of the firing layer 8. Gas of the solid fuel of various shapes volatiled in the firing layer 8 is burnt in the primary combustion chamber 9 and the second combustion chamber 10, and at the same time either a boiler water or a circulation water is passed in the fire bars 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a furnace for amorphous solid fuel, and its purpose is to eliminate temporary volatile matter even when a large amount of amorphous solid fuel (for example, wood flour, crushed rubber, etc.) is input. It is possible to prevent incomplete combustion of the amorphous solid fuel due to generation of large amounts, thereby increasing the combustion efficiency of the amorphous solid fuel, and by adjusting the amount of air above the grate, the area in which the large intestine is formed is limited. The inside of the fuel storage tank formed at the top of the large layer is always in an oxygen-deficient state to prevent the large scale from expanding, and the primary combustion chamber is set as a downward-facing combustion furnace to burn the volatile content of the amorphous solid fuel in the lower part of the large intestine. ``An object of the present invention is to provide an amorphous solid fuel reactor that can prevent expansion in one direction and limit the overall range.

The next object of this invention is to increase the service life of the grate itself by passing water through the grate used in this furnace, and by rotating the grate.
Ash content deposited in the second layer or ash layer with a low melting point (clinker)
The purpose of the present invention is to provide a device for use in amorphous solid fuels, which can remove combustion obstacles such as the above with projections installed in a grate.

A further object of the present invention is to provide an unshaped solid fuel furnace that can be suitably used both as a boiler and as a hot air generating furnace.

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

In Figures 1, 2, and 3, (1) is the supply port for the amorphous solid fuel (2), and this supply port (1) is connected to the furnace (3).
It is opened above.

(4) is a grate formed by combining a required number of pipes (4a) through which water can flow, and is arranged below the supply port (1).

Suitable examples of the amorphous solid fuel (2) used in this invention include wood, bagasse, rice hulls, old tire chips, and the like.

(5) is the storage tank, the grate (4), and the furnace (3) in the Jz section.
is formed within.

(6) is an air outlet, which is protruded from the furnace wall (7) near the grate (4), and has one side (8) directly in front of the grate (4).

(9) is a primary combustion chamber formed directly below the grate (4) for combusting the volatile matter of the amorphous solid fuel (2);
0) is a secondary combustion chamber connected to this primary combustion chamber.

(11) is an ash discharge mechanism, (12) is a drum provided when used as a boiler, and (13) is a water pipe.

(14) is a heat exchanger, and (15) is a forced fuel extrusion device.

Figures 2 and 3 show modified examples in which the grate (4) is inclined at a required acute angle (θ) with respect to the horizontal plane of the furnace (3). When the water is heated in the grate (4) and circulated into the drum (12), the purpose is to make it easier for the warm air to separate from the drum (4a) and to remove the gas contained in the moisture that has rapidly expanded in the pipe (4a). (12) This is to make it easier to escape into the interior and avoid explosions.

The reason why the angle is acute (θ) is because of the original function of the grate (4); if the angle is wide, the unshaped solid fuel (2) will fall and the combustibility will be impaired. This is for defense 1 and 2.

The reason for separating the combustion chamber into the primary combustion chamber (9) and the secondary combustion chamber (10) is that incompletely combusted gas generated from solids that were not sufficiently combusted in the primary combustion chamber (9) This is to ensure complete combustion in the secondary combustion chamber.

In addition, in order to pass water to the grate (4), the grate (4)
It is not limited to the case where it is horizontal, but even when it is arranged in an inclined form, forced circulation may be performed using a pump (not shown) or the like.

Figures 4 (A) and (B) show examples of changes in the shape of the grate (4), in which the pipe (4a) is made into a double pipe and the pipe (4a) is made into a double pipe.
4a) A required number of plate-shaped or round bar protrusions (16) are planted on the outer periphery, and adjacent pipes (4a) are rotated so as to face each other, or the opposing directions are not only mutually inward but also mutually. A rotating mechanism (17) that provides rotation such as outward rotation is attached to the outside of the furnace (3).

Due to this rotational movement, the stratified ash on the grate (4) is stirred and, after this stirring, falls downward.

Note that (18) is a swivel joint.

In the present invention, the grate (4) can be either a fixed type or a rotary type as described above, but in either of these embodiments, the grate (4) can be sloped.

In this case, the fixed grate (4) is suitably used for materials with relatively low ash content, such as wood chips and chips.

When a fixed grate (4) is adopted and the unstructured solid fuel furnace according to the present invention is applied to a boiler, the grate is placed near the boiler drum etc. and directly connected to the hot water reservoir. The grate (4) is connected to allow natural circulation of hot water in the grate (4), and is preferably sloped to prevent burnout and water hammer caused by air bubbles in the grate.

The unshaped solid fuel furnace constructed as described above has a fuel supply port connected to the fuel storage above the grate.

Bagasse, old tire chips, etc. are supplied as fuel from the fuel supply port, and the amorphous solid fuel is burned while ventilation is passed directly above this grate, and the storage tank above this large space is always kept in an oxygen-deficient state. Prevent the expansion of the compendium by storing it 1. hL, The gas of the amorphous solid fuel volatilized on the large surface is combusted in the primary combustion chamber and the secondary combustion chamber, and boiler water or circulating water is passed through the inside of the grate.

This water passage through the grate protects the grate itself from severe damage caused by high-temperature oxidizing atmosphere and increases its service life, and the grate itself becomes a heat absorber, causing the large box directly above the grate to become abnormally high temperature. prevent this from happening.

This grate receives intense radiant heat from both the large box and the high-temperature flame in the primary combustion chamber, so it becomes a large heat absorber relative to its heat transfer area. The unit can be made smaller.

As shown in the following, the unshaped solid fuel furnace according to the present invention has the following features:
Since we decided to pass water through the grate, this grate acts as a heat exchanger when used as a boiler.
In addition, the service life of the grate itself is increased, and since the combustion chamber is composed of a primary combustion chamber and a secondary combustion chamber for burning below the grate, the combustion efficiency of solid fuel can be greatly improved.
Moreover, by tilting the grate as necessary, the circulation of hot water from the grate to the tank becomes a natural circulation, and it is reliable even when using solid fuels such as old tire chips whose ash content is difficult to dispose of. This is an unshaped solid fuel furnace that can effectively process ash.

[Brief explanation of the drawing]

The drawings all show a monolithic solid fuel furnace according to an embodiment of this invention, with FIG. 1 being a cross-sectional view, FIG. 2 being a longitudinal sectional view, and FIG. 3 being a cross-sectional explanatory view of another embodiment. Figure 4 (A), (B
) is a cross-sectional explanatory diagram of a rotating grate. (1)... Supply port (2)... Unshaped solid fuel (3)... Furnace (4)...
・Grate (4a)...Pipe (5
)... Storage tank (6)... Ventilation port
(7)・・・Furnace Wall (8)・・・Fire
Tank (9)... Primary combustion chamber (10)...
・Second combustion chamber (16)・・・Protrusion Patent applicant Yoshimine Kikan Co., Ltd. Agent Patent attorney Yoshihiro Kiyohara

Claims (3)

[Claims] (1) A supply port for unshaped solid fuel is opened above the furnace, and a grate is provided with the required number of pipes that allow water to flow inside, and the solid fuel is burned directly above the grate. In order to create a large area for use, a ventilation opening is provided protruding from the furnace wall near the grate, and a storage tank for unshaped solid fuel is formed in the second part of this general area, and a storage tank for unshaped solid fuel is installed directly below this grate. An unshaped solid fuel furnace comprising a primary combustion chamber for combustion of volatile components of fuel, and a secondary combustion chamber connected to the primary combustion chamber. (2) An unshaped solid fuel furnace according to claim 1, characterized in that the grate is inclined at a required acute angle with respect to the horizontal plane of the furnace. (3) The grate is composed of hollow pipes that are arranged in parallel at a required distance to allow water to flow into the internal cavity, and the required number of protrusions are planted on the outer periphery of the hollow pipes, and the adjacent pipes rotate in opposite directions. An unstructured solid fuel furnace with an external drive mechanism attached to the outside of the furnace.