JPH0854110A - Anti-pressure refuse supplying apparatus - Google Patents

Abstract

PURPOSE:To provide an anti-pressure refuse supplying apparatus in which refuse can be supplied into a fluidized bed refuse incinerating furnace without leaking gas in the furnace out of the furnace even if the furnace becomes suddenly pressurized (positive pressure). CONSTITUTION:A fluidized bed refuse incinerating furnace 10 has a wind box 14 at a lower part in a furnace body 12, a fluidized bed 18 formed via a gas dispersing plate 16 at the upstream side of the box 14, and refuse supply means 22 connected to the upstream side of the bed 18 via a refuse throwing tube 20, and comprises gas leakage preventing means 24 provided at the tube 20 connected with the means 22 and the body 12. As the means 24, two stages of air locking valves 28, 30 provided at the above and below an enlarged part 26 are, for example, provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-pressure dust feeding device for feeding dust into a fluidized bed refuse incinerator without causing leakage of gas inside the furnace even when the pressure inside the oven becomes positive. Is.

[0002]

2. Description of the Related Art Conventionally, a wind box is provided in the lower part of a furnace body, a fluidized bed is formed on the upper side of the air box through an air dispersion plate, and dust is put into the fluidized bed for incineration. Such a fluidized bed refuse incinerator is well known (see, for example, FIG. 2 of JP-A-4-39509).

[0003]

In a conventional fluidized bed refuse incinerator, due to sudden fluctuations in the amount of gas generated in the furnace,
When the pressure in the furnace becomes a positive pressure, a gas leak occurs around the dust supply device, the leaked unburned gas burns outside the furnace, and an odor problem occurs. In particular, when the fluidized bed furnace is multi-staged, the pressure loss of the entire system increases, so that a furnace having a positive pressure in the previous stage (lower stage) is required. In order to eliminate the positive pressure in the furnace, if the pressure in the front (lower) furnace is set to atmospheric pressure or negative pressure, the negative pressure in the furnace in the latter (upper) becomes too large and Problems arise and production costs are high.

The present invention has been made in view of the above points, and an object of the present invention is to provide a device for supplying dust into a furnace without causing gas leak even if the furnace is under a pressurized state. To do.

[0005]

In order to achieve the above-mentioned object, the anti-pressure dust supply device of the present invention has a wind box in the lower part of the furnace body, and a gas dispersion plate on the upper side of the wind box. In a fluidized bed refuse incinerator in which a fluidized bed is formed through the above, and a waste feeding means is connected to the upper side of this fluidized bed, a gas leak is prevented in the waste feeding tube that connects the waste feeding means and the furnace body. It is configured by providing means. In the above apparatus, the gas leak prevention means is, for example, composed of two-stage airlock valves provided above and below the enlarged portion.

[0006]

When supplying dust into the furnace, as shown in FIG. 2, first, the lower valve is closed and then the upper valve is opened to drop the dust into the enlarged portion. Next, the upper valve is closed and the lower valve is opened, and the dust in the expansion section is put into the furnace. Even if the inside of the furnace suddenly becomes pressurized (positive pressure), one of the valves is closed, so that the gas does not leak from the dust supply device to the outside.

[0007]

EXAMPLES The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited to the following examples, and various modifications can be made as appropriate. FIG. 1 shows an embodiment of a pressure-resistant waste supply device of the present invention and a fluidized bed waste incinerator. Reference numeral 10 denotes a fluidized bed refuse incinerator, which has a wind box 14 in the lower part of the furnace body 12, a fluidized bed 18 is formed on the upper side of the wind box 14 through a gas dispersion plate 16, and the upper side of the fluidized bed 18 is formed. A waste supply means 22 such as a waste supply hopper is connected through a waste input pipe 20. Reference numeral 21 is a fluid medium discharge pipe, and 23 is a freeboard.

A gas leak preventing means 24 is provided in the dust introducing pipe 20 which connects the dust supplying means 22 and the furnace body 12. The gas prevention means 24 is, for example, the dust input pipe 20.
The enlarged part 26 is formed by expanding the diameter of a part of the enlarged part 2
It is configured by providing two-stage airlock valves 28 and 30 above and below the control unit 6. As shown in FIG. 2, the upper airlock valve 28 and the lower airlock valve 30 are alternately opened and closed so that when one is open, the other is closed and when closed, they overlap. The dust once stored in the expansion section 26 is supplied to the inside of the furnace, and even if the inside of the furnace suddenly becomes a positive pressure, gas leakage from the inside of the furnace can be prevented.

[0009]

Since the present invention is configured as described above, it has the following effects. (1) Since the gas input pipe that connects the waste supply means and the furnace main body is provided with the gas leak prevention means, even if the inside of the furnace suddenly becomes a positive pressure, the waste is supplied into the furnace without causing gas leakage. can do. (2) When the gas leak prevention means is composed of two-stage airlock valves provided above and below the expansion portion, these valves are alternately opened and closed so that when one is open, the other is closed. By supplying the waste stored in the section into the furnace,
Even if the inside of the furnace suddenly becomes a positive pressure, it is possible to reliably prevent gas leakage from the inside of the furnace.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a pressure-resistant waste supply device of the present invention together with a fluidized bed waste incinerator.

FIG. 2 is a diagram showing an open / closed state of an upper valve and a lower valve in the anti-pressure refuse supply device shown in FIG.

[Explanation of symbols]

 10 Fluidized Bed Waste Incinerator 12 Furnace Main Body 20 Waste Input Pipe 22 Waste Supply Means 24 Gas Leak Prevention Means 26 Expanding Part 28 Upper Valve 30 Lower Valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Katahata 1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries Ltd. Akashi Factory (72) Inventor Toshinori Muraoka 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy industry Akashi factory

Claims (2)

[Claims] 1. A furnace is provided with a wind box in a lower portion thereof, a fluidized bed is formed on an upper side of the wind box via a gas dispersion plate, and a dust supply means is provided on an upper side of the fluidized bed via a dust feeding pipe. In a fluidized bed refuse incinerator in which a gas leak prevention means is connected to a refuse feeding means for connecting a refuse feeding means and a furnace body, a pressure-resistant refuse feeding device characterized in that: 2. The anti-compressive dust supply apparatus according to claim 1, wherein the gas leak prevention means comprises two-stage airlock valves provided above and below the enlarged portion.