JPH109552A - Combustion melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently separate molten slag from combustion gas to prevent the slag from attaching to a slag port by a method wherein an inlet port of fuel and air and an outlet port of combustion gas are disposed above, and an outlet port of molten slag and a slag storage communicating with the outlet port of molten slag are disposed below and an outlet port of combustion gas is provided in the slag storage. SOLUTION: A combustion gas duct 5 is provided at the top end of the combustion melting furnace 2 and a port 1 for fuel and air is provided in an upper side wall. A slag storage 7 is provided below the furnace 2 through a baffle 4 including a slag port 6 and a combustion gas duct 8 is provided in the slag storage 7. High temperature combustion gas produced in the furnace 2 turns reversely at the baffle 4 and flows upward, passing through the center of a turning flow, and is discharged from the duct 5. On the other hand, molten slag is discharged into the slag storage 7 through the slag port 6, where a part of the combustion gas is discharged from the port 6 through the duct 8, and hence slag is prevented from solidifying at the port 6 and the port 6 is prevented from being closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion melting furnace suitable for being applied to a refuse incinerator.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional combustion melting furnace used for a refuse incinerator, a boiler or the like. In FIG. 2, 12
Denotes a combustion melting furnace, in which fuel is supplied from a fuel nozzle 11 and air is supplied from an air hole 13 to the combustion melting furnace 12 in a swirling flow. The high-temperature combustion gas generated in the combustion melting furnace 12 is discharged through a baffle 14 and a combustion gas duct 15, while the molten slag is discharged through a slag port 16 into a slag reservoir 17.

[0003]

The conventional combustion melting furnace shown in FIG. 2 has the following various problems.

(1) Since the inlet of fuel and air and the outlet of combustion gas are located at both ends of the combustion melting furnace, the flow directions of the combustion gas and the molten slag are the same, the separation efficiency of the molten slag is low, A part of the slag is discharged out of the combustion melting furnace together with the combustion gas.

(2) In the vicinity of the fuel and air inlets of the combustion melting furnace, the gas temperature is low because combustion has not progressed. Therefore, fuel with poor combustibility cannot be burned.

(3) Due to the heat loss at the slag mouth at the inlet of the slag reservoir, the slag accumulates in this portion and is likely to solidify and close.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a combustion melting furnace which has high efficiency in separating molten slag from combustion gas, has good combustion performance, and does not cause slag to adhere to the slag port.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a combustion melting furnace is of a vertical type, and both an inlet for fuel and air and an outlet for combustion gas are disposed on an upper portion thereof, and a lower portion is provided on a lower portion. An outlet for the molten slag and a slag reservoir connected to the outlet are provided, and a combustion gas outlet is provided in the slag reservoir.

In the combustion melting furnace according to the present invention, the fuel and air inlets are preferably provided tangentially and axially downward of the combustion melting furnace.

[0010] The combustion and melting furnace according to the present invention has the above-mentioned structure, and the fuel and air are supplied from the upper part of the combustion and melting furnace downward, preferably in a swirling flow, and burn.
Turning, the combustion gas is discharged from the upper part of the furnace.

On the other hand, the molten slag flows down along the furnace wall due to gravity and is discharged from the slag port into the slag reservoir. Here, by extracting the combustion gas from the combustion gas discharge port provided in the slag reservoir, the slag port is heated by the temperature of the combustion gas to supplement the heat loss there and prevent the slag from sticking.

In the combustion melting furnace according to the present invention, if the flow velocity of the fuel and air is low, the combustion gas cannot be lowered and the U-turn phenomenon at the bottom of the furnace cannot be achieved. Escape. However, above a certain flow rate, the combustion gases flow down along the furnace wall and the U
By turning, the central part of the furnace (near the axis) can flow as an upward flow. This point has already been demonstrated.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A combustion melting furnace according to the present invention will be specifically described below with reference to an embodiment shown in FIG. In FIG. 1, reference numeral 2 denotes a combustion melting furnace, in which a combustion gas duct 5 is provided at an upper end and fuel and air holes 1 are provided on an upper side wall.

A slag reservoir 7 is disposed below the combustion melting furnace 2 via a baffle 4 provided with a slag port 6.
The slag reservoir 7 is provided with a combustion gas duct 8.

In the combustion melting furnace 2 shown in FIG. 1, the furnace main body is formed in a vertical type, and the fuel and air are supplied to the combustion melting furnace 2 as swirling flows from the fuel and air holes 1 provided above. . The high-temperature combustion gas generated in the combustion melting furnace 2 makes a U-turn at the baffle 4 and flows upward through the central portion of the swirling flow as schematically shown by a broken line in the figure, and is discharged from the combustion gas duct 5.

On the other hand, the molten slag is discharged to a slag reservoir 7 through a slag port 6. Here, a part of the combustion gas is discharged from the slag port 6 through the combustion gas duct 8, thereby supplementing the heat loss at the slag port 6 and avoiding solidification and blockage of the slag at the slag port 6.

It is preferable that the angle of the baffle 4 of the partition provided between the combustion melting furnace 2 and the slag reservoir 7 is reduced so that the slag flows down and accumulates easily.

[0018]

As described above, the combustion and melting furnace according to the present invention has a vertical structure, in which both the fuel and air inlets and the combustion gas outlet are disposed at the upper part, and the molten slag outlet is provided at the lower part. A slag reservoir communicated therewith and provided with a combustion gas outlet is provided.

In this combustion melting furnace, the combustion gas initially flows downward, and makes a U-turn at the furnace bottom to flow upward. That is, since there is a point where the axial speed becomes “zero”, the molten slag falls at that point and is easily separated from the gas. Therefore, the slag separation efficiency is high.

Further, in the combustion melting furnace according to the present invention, the high-temperature combustion gas flows upward in a U-turn, but this becomes the ignition source of the newly supplied fuel, so that even the hardly combustible fuel is easily burned.

In the combustion melting furnace according to the present invention, the heat loss from the outlet of the molten slag can be supplemented by removing the high-temperature combustion gas from the combustion gas discharge port of the slag reservoir. There is no.

[Brief description of the drawings]

FIG. 1 is a sectional view of a combustion melting furnace according to an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional combustion melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel and air hole 2 Combustion melting furnace 4 Baffle 5 Combustion gas duct 6 Slag port 7 Slag reservoir 8 Combustion gas duct

Claims (1)

[Claims] 1. A vertical combustion-melting furnace, wherein both an inlet for fuel and air and an outlet for combustion gas are disposed in an upper portion, and an outlet for molten slag and a slag reservoir communicated therewith are disposed in a lower portion. A combustion melting furnace, wherein a combustion gas outlet is provided in the slag reservoir.