JP3071171B2 - Swirling type ash melting furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a swirling type ash melting furnace in which incinerated ash such as waste is swirled and melted by a burner to form molten slag.

[0002]

2. Description of the Related Art As a final disposal method for refuse incineration ash, sewage sludge incineration ash, etc., landfills have conventionally been mainly used. In addition, a method of preventing outflow of heavy metals while at the same time utilizing the obtained slag as a raw material as a permeable block or a roadbed material, and the like, is becoming widespread.

[0003] For this purpose, a swirling flow ash melting furnace as shown in Fig. 4 has conventionally been used. In this conventional swirling type ash melting furnace, incineration ash is blown tangentially into an inclined swirling melting part 1 and melted by a main burner 2 while being swirled.
And the fuel gas is discharged from a gate 4 provided at the center of the bottom, while the combustion gas is sent from an upper exhaust port 5 of the furnace body 3 to an exhaust gas treatment facility. 6 is an auxiliary burner, 7 is a sprue burner, and 8 is a slag conveyor.

[0004] In such a swirling flow ash melting furnace, the furnace pressure must always be set to a positive pressure higher than the atmospheric pressure in order to stably discharge the molten slag. In order to heat the gate 4 appropriately, an exhaust gas suction port 9 is also provided below the gate 4.
And a part of the combustion gas is sucked from the furnace. As a result, a part of the fly ash that has not been completely melted in the swirl melting part 1 may reach the gate 4 on the combustion gas and may adhere to the surface of the molten slag taken out to the slag conveyor 8 as dust. Was. Such adhesion of dust causes a reduction in commercial value when the molten slag is commercialized as a water-permeable block or a roadbed material.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, and enables the molten slag to flow out stably without causing dust to adhere to the surface of the molten slag. The purpose of the present invention is to provide a ash melting furnace.

[0006]

Has been made to solve the above problems, there is provided a means for solving the present invention, while turning the ash melted by a burner, in the swirling flow type ash melting furnace taken out of the furnace as a molten slag, the burner Side of the furnace body where the flue gas from the furnace flows
Through a gas separation wall with openings for the flow of molten slag.
And a slag box is installed in the burner's combustion exhaust gas flow direction .
In contrast, Rutotomoni with different flow Direction of molten slag,
The flue gas is blocked by the gas separation wall,
The slag box has a burner inside, and the pressure inside the slag box is
It is characterized in that the pressure is maintained higher than the pressure of the main body . Specifically, in the slag box, the molten slag
Is preferably discharged outside with a residence time .

[0007] In the swirling flow type ash melting furnace of the present invention is-out guide in a different direction to the molten slag combustion gases, blocking gas separating wall
Since they were taken out to the outside of the furnace and, the dust flying aboard the combustion gas hardly adheres to the surface of the molten slag. In particular, a structure in which a slag box is provided on the side of the furnace body via a gas separation wall with an opening for flowing molten slag ,
A burner is installed inside, and the pressure in the slag box is
Since the slag was maintained at a higher level , a molten slag with no dust attached can be taken out.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 is a schematic perspective view of a swirling type ash melting furnace of the present invention, FIG. 2 is a sectional view taken along line AA, and FIG. 3 is a sectional view taken along line BB. In these figures, reference numeral 1 denotes a swirling melting portion into which incineration ash is blown in a tangential direction, 2 denotes a main burner provided in the swirling melting portion 1, and 3 denotes a slag melted in the swirling melting portion 1 flows in with the flue gas. Furnace bodies 5 and 5 are upper exhaust ports provided directly above the furnace body 3 and are the same as those of the conventional swirling type ash melting furnace shown in FIG. However, in the present invention, the slag box 10 is provided on the side of the furnace main body 3 so that the flow direction of the combustion exhaust gas from the burner is different from the flow direction of the molten slag.

The slag box 10 has a gate 4 in the center of the bottom, and the bottom surface is an inclined surface like the bottom surface of the furnace body 3 as shown in FIG. A gas separation wall 11 as shown in FIG. 2 is provided between the slag box 10 and the furnace main body 3. The gas separation wall 11 is provided with an opening 12 for flowing molten slag at a lower portion, so that only the molten slag can flow into the slag box 10 while shutting off combustion exhaust gas. In addition, a sprue burner 7 is provided on the ceiling of the slag box 10 to maintain the pressure in the slag box 10 higher than the pressure of the furnace body.

In the swirling-flow ash melting furnace of the present invention thus constructed, the incineration ash is blown tangentially into the swirling / melting section 1 to be swirled while being melted by the main burner 2, and the molten slag is melted together with the combustion gas. Leading to the lower furnace body 3 is the same as in the prior art. However, in the furnace of the present invention, the combustion gas is exhausted from the upper exhaust port 5 provided immediately above the furnace main body 3,
The molten slag flows in a direction perpendicular to the combustion gas and flows into the slag box 10 from the opening 12 of the gas separation wall 11.

The molten slag flowing into the slag box 10 in this way is further heated by the gate burner 7 on the ceiling of the slag box 10 and taken out from the gate 4 provided at the bottom center. In the swirling type ash melting furnace, it is inevitable that unmelted fly ash accompanies the combustion gas. However, the combustion gas is shut off by the gas separation wall 11 and the inside of the slag box 10 is closed by the gate burner 7. 3, the combustion gas of the gate burner 7 is supplied to the gas separation wall 11.
Flows from the opening 12 toward the furnace body 3 to prevent the combustion gas from flowing from the furnace body 3 side. The slag box 10
The molten slag flows out stably due to the positive pressure in the inside.

As a result, the molten slag taken out from the gate 4 to the slag conveyor 8 has no dust attached thereto,
Even when this molten slag is commercialized as a water-permeable block or a roadbed material, the commercial value is not reduced. Further, since the molten slag flows out with a sufficient residence time, the number of bubbles inside the molten slag is reduced, and a high-quality slag can be obtained in this aspect as well.

In addition, since the swirl type ash melting furnace of the present invention has the slag box 10 which is most susceptible to erosion provided on the side of the furnace main body 3, the operation of replacing only the eroded portion can be easily performed. There is also.

[0014]

As described above, in the swirling type ash melting furnace of the present invention, the molten slag is guided in a direction different from the combustion gas and is taken out of the furnace. Can be taken out, and since the molten slag has few internal bubbles, the commercial value does not decrease even when commercialized as a water-permeable block or a roadbed material. Further, in the swirling type ash melting furnace of the present invention, only the slag box which is most likely to be eroded can be easily replaced.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a swirling type ash melting furnace of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

FIG. 4 is a cross-sectional view of a conventional swirling flow ash melting furnace.

[Explanation of symbols]

1 swirl melting part, 2 main burner, 3 furnace body, 4 gate, 5 upper exhaust port, 6 auxiliary burner, 7 gate burner,
8 slag conveyor, 9 exhaust gas suction port, 10 slag box, 11 gas separation wall, 12 opening for molten slag flow

Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F23J 1/00 F23G 5/00 F23J 1/08

Claims (2)

(57) [Claims] 1. An incineration ash is swirled and melted by a burner,
In a swirl-flow ash melting furnace that is taken out of the furnace as molten slag, the ash melts on the side of the furnace body where the combustion exhaust gas from the burner flows.
Slurry through gas separation walls with openings for molten slag flow
The grayed boxes provided, relative to the direction of flow of the combustion exhaust gas of the burner,
Rutotomoni with different flow Direction of the molten slag, the gas
The combustion exhaust gas is blocked by a separation wall, and the slag box is
Is equipped with a burner inside, and the pressure in the slag box is
A swirling flow ash melting furnace characterized by being maintained at a higher force . 2. In the slag box, molten slag is accumulated.
2. The method according to claim 1, wherein the liquid flows out with a retention time.
Swirling ash melting furnace.