JPS6196304A - Combustion device - Google Patents

Abstract

PURPOSE:To permit to constitute a hearth in compact and effect combustion efficiently by a method wherein the rotating hearth of a stage type which a central part is high and outer peripheral part is low, is arranged on the bottom of the hearth. CONSTITUTION:A cylinder body 8, having a closed ceiling, is fitted integrally on the central part of the rotating hearth 7 and annular floor plates 9, 10, 11 of three, are annexed in the stage type on the bias outer surface of the cylinder body. Solid fuel, supplied on a dropping position A, is moved under being rotated corresponding to the rotating of the rotating hearth 7, combustion having a flame is effected by ignition of an ignition burner 21. The outer peripheral of the rotating plate 6 is formed by a polygon, therefore, ashes may be dropped easily from the clearance between inner wall of the hearth 1.

Description

[Detailed Description of the Invention] [Object of the Invention] LLJ, Δ杜L” The present invention is a method for burning solid fuel made of solid combustible material in the form of a pellet, coal, etc., and appropriately utilizing the thermal energy thereof. This relates to combustion equipment.

Conventionally, there has been a rotary hearth type combustion device for solid fuel such as coal. In this device, solid fuel is put into a predetermined position on a rotating hearth shaped like a dust ring and ignited by an ignition burner, and as the hearth moves as the hearth rotates, it initially produces a flame and emits gas. The ash is burnt, and then the ash that remains is discharged from the hearth while the so-called oyster is burned, which burns without a flame.

However, solid fuels such as coal have a considerably long explosion combustion time, and in a small rotary hearth, they may be discharged before they are completely burned, or conversely, if you try to achieve complete combustion, a large amount of There were drawbacks such as the need to use a hearth, making the device large.

The present invention has been made in order to eliminate the drawbacks of the conventional combustion equipment as described above, and its purpose is to make the entire equipment compact and to improve the initial gas combustion and subsequent gas combustion. It is an object of the present invention to provide a new combustion device capable of effectively performing complete combustion and recovering sufficient heat energy.

[Configuration of the invention 1 hands for doing The combustion device of the present invention has a high central part at the bottom of the furnace.

A stepped rotary hearth with a lower outer periphery is provided, and solid fuel is supplied to the high center part of the rotary hearth and burned while rotating, and after approximately one revolution, the lower part is It is characterized in that it is forcibly scraped off to cause continuous combustion.

Next, one embodiment of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a cylindrical furnace constructed of durable materials, and a hearth 2 is provided at the bottom of the furnace. A large opening 2a is opened in the center of the hearth 2, and a rotating shaft 3 is vertically disposed in the center. The rotating shaft 3
is adapted to be rotationally driven by a motor 5 via an appropriate transmission means 4, and a rotary plate 6 is provided at its upper end.
is installed.

The central portion of the rotary plate 6 is wide open to match the opening 2a, and an inverted funnel-shaped rotary hearth 7 is attached to the upper surface of its outer periphery.

A cylindrical body 8 with a closed ceiling is integrally attached to the upper center of the rotary hearth 7, and three annular floor plates 9, 10, 11 are attached in steps to the sloping outer surface. There is.

A shroud plate 12.1 is provided above the outer periphery of the uppermost annular floor plate 9 and the second annular floor plate 10 with a slight gap therebetween.
3 are respectively disposed, and the shroud plates 12, 13 are supported (not shown) on the furnace 1.

As is clear from FIG. 2, a part of the shrouding plate 12 has an opening 12b, and a scraping piece 12a is provided on the downstream side of the opening 12b.
are arranged in a row across the annular floor plate 9. Incidentally, the scraping piece 12a may be integrally formed by bending the end portion of the shroud plate 121.

Further, a part of the shroud plate 13 has an opening 13b, and a scraping piece 13a is continuously provided on the downstream side of the opening 13b so as to cross the annular floor plate 10. The scraping piece 13Jl is preferably positioned immediately upstream of the opening 12b of the shroud 12 as shown in the figure.

As is clear from FIG. 2, the outer periphery of the rotating plate 6 is polygonal so that ash can easily fall from the gap between it and the inner wall of the furnace 1, and the lower surface of the rotary plate 6 has a polygonal shape. is scraping board 1
4 is attached to collect the fallen ashes and scrape them off from the discharge hole 2b made in the hearth 2 to the discharge port 15.

Reference numeral 16 denotes a fuel supply pipe which, while adjusting the solid fuel put into the upper input hopper 17 with the metering device 18, feeds the solid fuel into the downstream side (the first It is designed to be supplied to the drop position A') in Figure 2.

Reference numeral 19 denotes a fan, which uses a motor 2o to send air into the internal space of the driven bed 7, and blows it out into the furnace from air holes 71L and 8a formed in the rotary hearth 7 and the cylinder 8. . 21 is an ignition burner.

Next, the operation and procedure for burning solid fuel by the apparatus of the above embodiment will be explained.

First, solid fuel is put into the charging hopper 17, and the solid fuel is put into the dropping position A' in the gas combustion area A of the rotary hearth 7 while adjusting the charging amount using the metering device 18. In addition, when rotating the rotary hearth 7 intermittently little by little, it is preferable to intermittently inject the solid fuel, and when rotating the rotary hearth 7 continuously, it is preferable to continuously inject the solid fuel.

The solid fuel ° supplied to the dropping position A' rotates as the rotary hearth 7 rotates, and the ignition burner 21
It is ignited, creating a flame and burning gas. Incidentally, the ignition by the ignition burner 21 may be performed for the solid fuel that is initially introduced.

When the rotary hearth 7 rotates approximately once, it is forcibly scraped onto the troublesome combustion zone B consisting of the annular floor plate 10 of the solid stage during combustion.

The fuel transferred to the annular floor plate 10 in the middle tier rotates and moves as the rotary hearth plate rotates while burning without igniting a flame. When it rotates approximately once, it is forcibly scraped off from the opening 13b by the scraping piece 13a onto the annular floor plate 11 at the lowest stage, rotated three times by the annular floor plate 11, and burnt out to become ashes.

The ash after combustion falls between the inner walls of the furnace 1, is scraped up by the scraping plate 14, and is discharged from the discharge hole 2b to the discharge port 15.

Note that air is constantly supplied through small holes 7a made in the rotary hearth 7, so that combustion is carried out efficiently.

Although the rotary hearth 7 of the above embodiment has three annular floor plates attached, the present invention is not limited to this.
The number of stages may be two or four or more, and may be set as appropriate depending on the design of the combustion device, the type and size of the solid fuel, etc.

Furthermore, the inverted funnel-shaped rotating hearth and the annular floor plate may be integrally constructed as shown in FIG. It is also possible to separate the rotary hearth of the lower combustion zone B and change the rotation speed of each.111° [Effects of the Invention] (1) At the bottom of the furnace, the central part is high and the outer part is high. part is low
Since the stepped rotary hearth is provided, the hearth can be configured compactly and three-dimensionally.

(2) Solid fuel is supplied to the central high part of the rotary hearth, and it is burnt while rotating, and after about one revolution, it is forcibly scraped off to the lower part to allow continuous combustion, so it is narrow. Even with the area of the hearth, it can be burned for a sufficient amount of time, and it is particularly suitable for solid fuels such as coal that are burnt with gas and burnt.

(3) Many air holes are made in the rotary hearth and air is forcibly supplied from the bottom of the hearth, allowing the combustible components of the fuel to be completely burned and generating sufficient firepower. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the combustion apparatus of the present invention;
FIG. 2 is a plan view thereof, and FIGS. 3 and 4 are sectional views showing other embodiments of the rotary hearth. ■... Furnace, 2... Hearth, 2a... Opening, 2b...
...Discharge hole, 3.Rotating shaft, 4.Driving means, 5.
... Motor, 6... Rotating plate, 7... Rotating hearth, 8
...Cylinder body, 9. i o, i i... annular floor plate, 12
．． 13...Shrouding board, 12a, 13a...Scraping piece, 1
2b, 13b... opening, 14... scraping plate, 15.
...Discharge port, 16...Fuel supply pipe, 17...Input hopper, 18...IL quantity device, 19...7 Ann, 2
0...Motor, 21...Burner, A...Scan combustion area, A'...Drop position, B...Sensitive combustion area.

Claims (2)

[Claims] (1) At the bottom of the furnace, a stepped rotary hearth with a high central part and a low outer peripheral part is arranged, and solid fuel is supplied to the central high part of the rotary hearth while the rotary hearth is rotated. Let it burn,
A combustion device characterized in that the lower part is forcibly scraped off after approximately one revolution to cause continuous combustion. (2) The combustion apparatus according to claim 1, wherein the rotary hearth is provided with a large number of air holes so that air is forcibly supplied from below the hearth.