JP3891685B2 - Ash melting furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention heats and melts the surface of ash, which is a material to be melted, such as incineration ash and fly ash discharged from municipal incinerators and industrial waste incinerators, and ash discharged from coal fired boilers, etc. In addition, the present invention relates to an ash melting furnace having an efficient brewing portion with improved molten slag discharge fluidity in an ash melting furnace for discharging molten ash as molten slag.
[0002]
[Prior art]
The generally used burner type ash melting furnace includes a circular rotary surface melting furnace and a square fixed surface melting furnace, but the rough functions of the square fixed surface melting furnace to which the present invention is applied are described. Will be explained.
As shown in FIG. 5, the square fixed surface ash melting furnace has an inclined furnace bottom 55 that descends obliquely, an ash supply part 53 provided on one end side of the furnace body, and a discharge provided on the other end side. It consists of an outlet 57 and a fixed burner 52 provided on the furnace ceiling 56. The ash supply unit 53 includes an ash storage unit 60 having an ash supply port 54 at the lower end, and the ash storage unit 60 stores an object to be melted such as incinerated ash and is an ash that is the material to be melted stored from below. 50 is directed to the discharge port 57 through the pusher 58, and the ash supply layer 59 is formed along the inclined surface of the furnace bottom 55.
[0003]
The fixed burner 52 is provided on the central axis of the furnace ceiling 56, and the liquid fuel pumped into the burner is atomized by high-pressure air or steam from the exhaust heat boiler and injected, and supplied together therewith. The atomized fuel is burned by mixing with the combustion air, and the flame radiant heat heats and melts the surface of the ash supply layer 59 to form the molten ash 25.
The ash on the outer surface of the ash supply layer 59 that continues to move toward the discharge port 57 is heated and melted to form the molten ash 25 and stored in the slag pond 65 as described above, and then is stored in the dam 63 as molten slag 25a. It is dripped to the lower part of the discharge port 57 through the provided slag tap port 64, and is discharged to the outside through a water seal conveyor (not shown).
[0004]
[Problems to be solved by the invention]
The weir 63 forming the slag pond 65 and the slag outlet 64 provided on the dam are as shown in FIG. 5 and FIG. 6 which is a view taken along the line IV-IV in FIG. The molten ash 25 formed in the shape of a rectangular reservoir and stored in the square slag basin 65 is discharged from a slag outlet 64 provided in the center. The movement of the molten ash 25 at the corners of the corner has a stag-like shape, and the stagnation portion enlarges with a decrease in temperature to narrow the flow path, thereby causing a decrease in the fluidity of the slag flow.
[0005]
The present invention has been made to solve such a problem, and has a high fluidity in the flow of molten slag made of molten ash stored in the slag pond to the slag discharge port, thereby improving the discharge rate of the molten slag. The purpose of the present invention is to provide an ash melting furnace , particularly a square fixed surface ash melting furnace .
[0006]
[Means for Solving the Problems]
Therefore, the ash melting furnace of the present invention is provided with an ash supply port on one end side of the furnace body, a discharge port for molten slag is formed on the other end side, and the ash supplied from the ash supply port is inclined to the bottom of the furnace. to together with heating and fusing the burner while moving to the discharge port side along, stored as a molten slag in slag pond formed by weir having a molten molten ash at the other end of the furnace bottom, and the reservoir In the ash melting furnace configured to discharge the molten slag provided at the furnace bottom end and discharged from the slag outlet provided in the center of the weir ,
Forming the bottom of the furnace of the slag pond in a direction toward the slag outlet,
And, forming both side walls of the weir provided on the other end side of the furnace bottom as a guide surface that converges on the tap hole provided at the furnace bottom end,
Both side walls forming the guide surface have a straight or curved surface shape in which the inflow width of the molten slag toward the slag outlet is gradually sandwiched .
[0007]
The guide surface may have a linear or curved surface shape in which the inflow width of the molten slag toward the slag outlet is gradually narrowed .
[0008]
The ash melting furnace according to claim 1 is heated and melted by a burner provided on a central axis of the furnace body, and the molten ash is provided in the center of a weir provided on the other end side of the furnace bottom. In the case of an ash melting furnace configured to be discharged from the slag outlet,
The slag tap outlet is provided at the center of the weir, and the bottom end of the furnace is preferably formed in a concave shape with its central shaft core portion directed toward the slag tap outlet, preferably gradually descending.
[0009]
[Action]
According to the above Symbol onset bright, due to the provision of the guiding surface in order to induce a smooth flow of the molten slag on the weir sidewall slag pond that stores the molten slag into the slag tapping port, is heated and melted by the burner The molten ash can move toward the slag outlet, which is the outlet of the slag pond, without stagnation without forming a stagnant part, and the molten ash can be efficiently concentrated at the slag outlet, Smooth discharge can be made possible.
[0010]
Further, according to the invention, in order the guide surface is a surface shaped to gradually narrow the width of the inlet breadth of molten slag toward the slag tapping port, toward the shape of the slag pool to slag tapping port It can be formed in a funnel shape, and the cause of stagnation can be eliminated by removing the two square corners on the weir side. Moreover, the flow velocity in the direction of hitting the wall is reduced, and erosion can be reduced.
[0011]
According to the invention described in claim 2, the ash melting furnace according to claim 1 is heated and melted by the burner provided on the center axis of the furnace body, and the molten ash is melted in addition to the furnace bottom. In the case of an ash melting furnace configured to be discharged from the slag tap outlet provided in the center of the weir provided on the end side, since the slag tap outlet is provided in the central portion of the weir, A smooth flow can be imparted to the flow of molten ash that is heated and melted by a burner provided on the center axis and forms the center of the flow on the center axis of the furnace bottom.
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 is easily directed and concentrated from a position away from the outlet. Can be made.
In addition, the notch shape of the slag outlet may be formed into a ship bottom shape so that the movement of the molten slag at the outlet is smooth.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the form of the Example of this invention is demonstrated with the example of illustration. However, the dimensions, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Absent. In addition, the same code | symbol is used about the same member as drawing which shows a prior art example.
[0013]
Figure 1 is a diagram showing the schematic structure of rectangular stationary surface ash-melting furnace to which the present invention is applied, the square fixed surface ash melting furnace of the present invention, at one end of the furnace body main ash supply unit 53 and an ash supply port 54 are provided below the ash supply port 54. The ash 50 is supplied from the ash supply port 54 onto a furnace bottom 55 provided below the ash supply port 54, and an ash supply layer 59 is formed along the inclined 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 molten ash 25 is stored as molten slag in the slag pond 10 formed by the weir 12 provided at the end of the furnace bottom 55 , and the stored molten slag is a slag outlet provided in the center of the weir 12. 11 to be discharged to the lower part of the discharge port 57.
[0014]
The slag pond 10 is provided at the end of the furnace bottom 55 as shown in the plan view seen from above shown in FIGS. 2 (A), (B), (C), and on the central axis YY of the weir 12. Is formed in a substantially funnel-like shape toward the slag outlet 11 provided on the slag, and is composed of, for example, a triangular slag basin 10a, a parabolic slag basin 10b, or a funnel-like slag basin 10c. 11a or a curved guide surface 11b or a funnel-shaped guide surface 11c is provided, and the flow width of the molten slag into the slag outlet 11 is gradually narrowed by the continuous guide surfaces 11a / 11b / 11c, so that the flow of the molten slag is natural. It is configured to converge to the slag outlet 11.
[0015]
Moreover, the structure seen from the side surface of the said slag pond 10 is shown in FIG.3 and FIG.4 which are the III-III views of FIG.
As shown in the figure, as shown in FIG. 3, the shape of the bottom is a ship bottom shape in which the minimum recess is formed at the center axis ZZ, and the center axis Y- It is constituted by a ship bottom type furnace bottom 13 (shown by a corner line) lowered for a while along Y (see FIG. 2). By the ship bottom furnace bottom 13, the flow of the molten slag is converged to the central axis YY.
In addition, the notch shape of the slag outlet may be formed into a ship bottom shape so that the movement of the molten slag at the outlet is smooth.
[0016]
【The invention's effect】
As described above, according to the rectangular fixed surface ash melting furnace of the present invention, the molten ash heated and melted by the burner forms a staying portion toward the slag outlet that is the outlet of the slag pond. It can be moved without stagnation, the molten ash can be efficiently converged at the slag outlet, the slag can be discharged smoothly, the molten slag discharge speed is increased, and Since the contact surface is small and the surface area is small, the heat loss is small.
[0017]
Further, according to the present invention, the shape of the slag pond is formed in a funnel shape toward the slag outlet, so the two square corners on the weir side are eliminated to eliminate the cause of stagnation, and the flow of molten slag Can be converged without difficulty toward the slag outlet. Furthermore, since the flow velocity toward the wall is small, the erosion of the refractory material in the weir is reduced.
[0018]
According to the invention described in claim 2 , since the slag outlet is provided in the central part of the weir, it is heated and melted by the burner provided on the central axis of the furnace body body, A smooth flow can be imparted to the flow of molten ash that forms the center of flow on the core.
Further, since the end of the furnace bottom is lowered for a while along the central axis of the furnace bottom and formed into a concave shape, the flow of molten ash to the slag outlet is easily directed from a position away from the outlet. And converge.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of an ash melting furnace according to the present invention.
2 is a diagram showing an example of a plan view seen from above the slag pond in FIG. 1, (A) shows a triangular slag pond, (B) shows a parabolic slag pond, and (C) a funnel shape. It is a figure which shows a slag pond.
FIG. 3 is a view taken along the line III-III in FIG.
4 is a longitudinal sectional view of the slag pond in FIG. 1. FIG.
FIG. 5 is a diagram showing a schematic configuration of a conventional ash melting furnace.
6 is a view taken along the line IV-IV in FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Slag pond 10a Triangular slag pond 10b Parabolic slag pond 10c Funnel-shaped slag pond 11 Slag outlet 11a Straight guide surface 11b Curved guide surface 11c Funnel-shaped guide surface 12 Weir 13 Ship bottom furnace bottom 25 Molten ash 25a Molten slag

Claims (2)

While providing an ash supply port on one end side of the furnace body, forming a discharge port for molten slag on the other end side, moving the ash supplied from the ash supply port to the discharge port side along the inclined furnace bottom The molten ash is heated and melted by a burner, and the molten ash is stored as molten slag in a slag pond formed by a weir provided at the other end of the furnace bottom , and the stored molten slag is provided at the furnace bottom end. And in the ash melting furnace configured to be discharged from the slag outlet at the center of the weir ,
Forming the bottom of the furnace of the slag pond in a direction toward the slag outlet,
And, forming both side walls of the weir provided on the other end side of the furnace bottom as a guide surface that converges on the tap opening provided at the furnace bottom end,
An ash melting furnace characterized in that both side walls forming the guide surface have a straight or curved surface shape with the inflow width of the molten slag toward the slag tap opening gradually sandwiched . A slag provided in the center of a weir provided in the other end side of the furnace bottom, wherein the ash melting furnace according to claim 1 is heated and melted by a burner provided on a central axis of the furnace body. In the case of an ash melting furnace configured to be discharged from the tap,
The slag tapping port provided in the center of the weir, the furnace bottom end according to claim 1, characterized in that the central axis portion are formed in a concave shape descending toward the slag tapping port Ash melting furnace.

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