JPH11281036A - Ash melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ash melting furnace which raises the discharge rate of a molten slag by permitting the molten slag consisting of a molten ash collected in a slag pool to have high flowability in its flow to a slag discharge port. SOLUTION: An ash melting furnace is so arranged as to transfer an ash 50 along an inclined furnace bottom 55 from an ash feed 53 at one end side of a furnace body toward a discharge port 57 at the other end side while forming an ash feed layer 59 and moving it toward the end of the furnace bottom 55, heat the surface of the ash feed layer 59 by means of a burner 52 fixed to a furnace ceiling 56 thereby forming a molten ash, forming a slag pool 10 by use of a weir 12 at the end of the furnace bottom 55 to reserve the molten ash therein, and discharge the reservoired molten slag to a lower portion of the discharge port 57 through a slag residuum outlet 11 provided at the weir 12. The slag pool 10 is formed in the form of a substantially funnel- like shape by means of guide surfaces provided at the weir 12, and thus the flow of the molten slag is naturally converged toward the slag residuum outlet 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing ash which is a member to be melted such as incinerated ash and fly ash discharged from an incinerator for municipal solid waste and industrial waste and ash discharged from a boiler for a coal-fired business. The present invention relates to an ash melting furnace having an efficient slag part in which the surface of the ash is melted by a burner and the molten ash is discharged as molten slag in the ash melting furnace to improve the discharge fluidity of the molten slag.

[0002]

2. Description of the Related Art The above-mentioned burner type ash melting furnaces generally used include a circular rotary surface melting furnace and a square fixed surface melting furnace. The function of will be described. As shown in FIG. 5, the ash melting furnace has an inclined furnace bottom 55 which is inclined downward, an ash supply section 53 provided at one end of the furnace body, and a discharge port 57 provided at the other end.
And the fixed burner 52 provided on the furnace ceiling 56. The ash supply unit 53 includes an ash storage unit 60 provided with an ash supply port 54 at a lower end. The ash storage unit 60 stores a material to be melted, such as incinerated ash, and stores the ash as the material to be melted from below. 50 is directed to the discharge port 57 via the pusher 58,
5, the ash supply layer 59 is formed along the inclined surface.

[0003] The fixed burner 52 is connected to the furnace ceiling 5.
6, the liquid fuel pumped into the burner is atomized by high-pressure air or steam from a waste heat boiler and injected, and mixed with the high-temperature combustion air supplied with the fuel to atomize the fuel. The burned fuel is burned, and the flame radiant heat heats and melts the surface of the ash supply layer 59 to melt the ash 25.
Is formed. The ash on the outer surface of the ash supply layer 59 which continues to move toward the discharge port 57 is heated and melted as described above to form the molten ash 25 and stored in the slag pond 65, and is then transferred to the weir 63 as the molten slag 25 a. The liquid is dropped to the lower part of the discharge port 57 through the provided slag discharge port 64 and discharged to the outside through a water seal conveyor (not shown).

[0004]

The weir 63 forming the slag pond 65 and the slag discharge port 64 provided on the weir are shown in FIG. 5 and FIG. As you see,
The slag pond 65 is formed in a substantially rectangular reservoir pond, and the molten ash 25 stored in the rectangular slag pond 65 is discharged from a slag discharge port 64 provided at the center. The movement of the molten ash 25 at the two rectangular corners on the 63 side has a stagnation shape, and the stagnation portion enlarges with a decrease in temperature, narrows the flow path, and causes a decrease in the fluidity of the slag flow.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has a high fluidity in a flow of a molten slag composed of molten ash stored in the slag pond to a slag discharge port to discharge the molten slag. The purpose is to provide an ash melting furnace with improved speed.

[0006]

Accordingly, in the ash melting furnace of the present invention, an ash supply port is provided at one end of the furnace main body, and a discharge port for molten slag is formed at the other end, and the ash supply port is supplied from the ash supply port. The molten ash is heated and melted by the burner while moving the ash along the inclined furnace bottom to the discharge port side, and the molten ash is melted from a slag discharge port of a weir formed on the other end side of the furnace bottom. In an ash melting furnace that discharges molten slag to the discharge port,
The storage weir is provided with a slag discharge port with a guide surface for imparting fluidity.

Further, it is preferable that the guide surface has a linear or curved surface shape in which the width of the molten slag flowing toward the slag outlet is gradually reduced.

The slag discharge port is provided at the center of the weir, and the furnace bottom end is preferably formed in a concave shape in which the center axis of the furnace bottom is preferably gradually lowered toward the slab discharge port. .

[0009]

According to the first aspect of the present invention, the guide surface is provided on the weir-side wall of the slag pond for storing the molten slag so as to induce a smooth flow of the molten slag to the slag discharge port. The molten ash heated and melted by the burner can be moved to the slag discharge port, which is the outlet of the slag pond, without stagnation without forming a stagnant portion, and the molten ash is efficiently concentrated at the slag discharge port. It is possible to smoothly discharge the molten slag.

According to the second aspect of the present invention, since the guide surface has a surface shape that gradually narrows the inflow width of the molten slag toward the slag discharge port, the shape of the slag pond is reduced. Is formed in a funnel shape toward the slag discharge port, and two square corners on the weir side are deleted to eliminate the cause of stagnation. In addition, the flow velocity in the direction of hitting the wall is reduced, and erosion can be reduced.

According to the third aspect of the present invention, since the slag discharge port is provided at the center of the weir, the slag discharge port is heated and melted by the burner provided on the central axis of the furnace body. The flow of the molten ash that forms the center of the flow on the bottom center axis can be made smooth. Further, since the central shaft core at the end of the furnace bottom is formed in a concave shape that gradually descends, the flow of the molten ash to the slag outlet can be easily directed and concentrated even from a position distant from the outlet. Can be done. The cutout shape of the slag outlet may be formed in a ship bottom shape so that the molten slag moves smoothly at the outlet.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
This will be described together with the illustrated example. However, the dimensions, shapes, relative positions, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples, unless otherwise specified. Absent. The same members as those in the drawings showing the conventional example are denoted by the same reference numerals.

FIG. 1 is a view showing a schematic configuration of an ash melting furnace of the present invention. In the ash melting furnace of the present invention, an ash supply section 53 is provided at one end of a furnace body and an ash supply port 54 is provided below the ash supply section 53. Provided, ash 5
Reference numeral 0 denotes a furnace bottom 5 provided below the ash supply port 54.
Ash supply layer 5 supplied along the inclined bottom 55
9, while moving toward the end of the furnace bottom 55, the ash on the surface of the ash supply layer 59 is heated and melted by the fixed burner 52 provided at the center axis of the furnace ceiling 56 at the top of the furnace body. The melted ash 25 is supplied to the furnace bottom 55.
The molten slag is stored in the slag pond 10 formed by the weir 12 provided at the end of the weir 12, and the stored molten slag is discharged from the slag discharge port 11 provided at the center of the weir 12 to the discharge port 57. It is configured to be discharged to the lower part.

The slag pond 10 is shown in FIGS.
As can be seen from the top plan view shown in FIG.
And is formed in a substantially funnel shape toward the slag discharge port 11 provided on the central axis Y-Y of the weir 12, for example, a triangular slag pond 10a or a parabolic slag pond 10b.
Alternatively, a linear guide surface 11a or a curved guide surface 11b or a funnel-like guide surface 11c is provided on the side wall of the weir 12 to form a slag discharge port 1 for molten slag.
1 to the continuous guide surface 11a / 11b / 11
c so that the flow of the molten slag naturally converges to the slag outlet 11.

The structure viewed from the side of the slag pond 10 is shown in FIGS. 3 and 4, which are III-III views in FIG. As shown in the figure, the shape of the bottom is as shown in FIG.
A ship bottom type in which a minimum recess is formed by the center axis ZZ, and a ship bottom type bottom temporarily lowered along the center axis YY (see FIG. 2) in the longitudinal direction of the furnace bottom. 13 (shown by corner lines). By the bottom type furnace bottom 13, the flow of the molten slag is converged to the center axis YY. In addition,
The cutout shape of the slag outlet may be formed in a ship bottom shape to facilitate the movement of the molten slag at the outlet.

[0016]

As described above, according to the first aspect of the present invention, the molten ash heated and melted by the burner forms a stagnant portion toward the slag discharge port which is the outlet of the slag pond. Can be moved without stagnation, the molten ash can be efficiently converged to the slag outlet, the molten slag can be smoothly discharged, the outflow speed of the molten slag can be increased, and Since the contact surface is small and the surface area is small, the heat loss is small.

According to the second aspect of the present invention, since the slag pond is formed in a funnel shape toward the slag discharge port, two square corners on the weir side are deleted to eliminate the cause of stagnation. At the same time, the flow of the molten slag can be easily converged toward the slag outlet. Further, the erosion of the refractory material at the weir portion is reduced because the flow velocity toward the wall is small.

According to the third aspect of the present invention, since the slag discharge port is provided at the center of the weir, the slag discharge port is heated and melted by the burner provided on the central axis of the furnace body. The flow of the molten ash that forms the center of the flow on the bottom center axis can have a smooth flow. In addition, since the end of the furnace bottom is temporarily lowered along the center axis and is formed in a concave shape, the flow of the molten ash to the slag discharge port can easily be directed from a position away from the discharge port. And converge.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an ash melting furnace of the present invention.

FIG. 2 is a diagram showing an embodiment of a plan view of the slag pond of FIG. 1 as viewed from above, where (A) shows a triangular slag pond, (B) shows a parabolic slag pond, and (C) a funnel shape. It is a figure showing a slag pond.

FIG. 3 is a III-III view of FIG. 1;

FIG. 4 is a longitudinal sectional view of the slag pond of FIG. 1;

FIG. 5 is a diagram showing a schematic configuration of a conventional ash melting furnace.

FIG. 6 is an IV-IV view of FIG. 5;

[Explanation of symbols]

 Reference Signs List 10 slag pond 10a triangular slag pond 10b parabolic slag pond 10c funnel-shaped slag pond 11 slag discharge port 11a linear guide surface 11b curved guide surface 11c funnel-shaped guide surface 12 weir 13 ship bottom type furnace bottom 25 molten ash 25a Molten slag

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuki Honda 1-8-1, Koura, Kanazawa-ku, Yokohama-shi Mitsubishi Heavy Industries, Ltd. Yokohama Research Laboratory (72) Inventor Ide Ishikawa 1--8, Koura, Kanazawa-ku, Yokohama-shi 1 Mitsubishi Heavy Industries, Ltd. Yokohama Research Laboratory (72) Inventor Kenichi Shibata 12 Nishikicho, Naka-ku, Yokohama-shi Mitsubishi Heavy Industries, Ltd. Yokohama Works

Claims (3)

[Claims] 1. An ash supply port is provided at one end of a furnace body, and a discharge port of molten slag is formed at the other end side. The ash supplied from the ash supply port is discharged along an inclined furnace bottom. While moving to the side while heating and melting by the burner, the molten ash is discharged from the slag discharge port of the weir formed on the other end side of the furnace bottom as molten slag to the discharge port in the ash melting furnace, An ash melting furnace comprising a slag discharge port with a guide surface for imparting fluidity to a weir. 2. The ash melting method according to claim 1, wherein the guide surface has a linear or curved surface shape that gradually narrows the width of inflow of the molten slag toward the slag discharge port. Furnace. 3. The slag discharge port is provided at the center of the weir, and the bottom end of the furnace is formed in a concave shape in which the central shaft portion is lowered toward the slab discharge port. The ash melting furnace according to claim 1.