JP5296040B2 - Waste ash heating system for waste gasification and melting equipment - Google Patents

Description

  The present invention relates to a dust ash heating apparatus for removing dioxins from dust ash in a waste gasification and melting treatment facility.

Various proposals have been made regarding dust ash heating devices in waste gasification and melting treatment facilities.
For example, Japanese Patent Laid-Open No. 2002-147739 proposes a method in which combustible gas containing ash generated from a gasification melting furnace is sent to a combustion chamber for combustion, and the ash that has dropped to the bottom in the combustion chamber is discharged by an ash removal conveyor Has been.
However, in the method described in Japanese Patent Application Laid-Open No. 2002-147739, the dioxins in the dust collection ash are volatilized and decomposed in the combustion gas. In the ash, only the surface layer is heated by the combustion gas and uniform heating is difficult, and since it is difficult to control the heating temperature, there is a possibility that the ash is insufficiently heated or melted due to overheating.

Japanese Patent Laid-Open No. 2003-221111 proposes an apparatus that efficiently and uniformly volatilizes and separates dioxins contained in fly ash and the like by continuous treatment by electromagnetic induction heating of a screw conveyor.
However, since the apparatus described in Japanese Patent Application Laid-Open No. 2003-221111 is a local heating method by induction heating, only the surface layer of the ash in the screw conveyor is heated, and uniform heating is difficult. Since it was difficult to control the temperature, there was a risk that the ash was insufficiently heated or melted due to overheating.

JP 2002-147739 A JP 2003-221111 A

  DISCLOSURE OF THE INVENTION The present invention solves the problems of the prior art as described above, and can dispose dust collected ash in a waste gasification melting treatment facility that gasifies and melts waste at a predetermined temperature. It is an object of the present invention to provide a dust ash heating device for a product gasification and melting treatment facility.

The present invention has been made as a result of intensive studies in order to solve the above-mentioned problems, and the gist of the present invention is the following contents as described in the claims.
(1) A dust collection ash heating device for heat treating dust collection ash in a waste gasification melting treatment facility for gasifying and melting waste , wherein the dust collection ash heating device is used in a waste gasification melting treatment facility. In addition to being provided in the ash extraction unit of the combustion chamber, the ash extraction device has a rotary scraper, and the dust ash is supplied from one side of the combustion chamber and rotated once by the rotary scraper, and then the bottom discharge port. Waste gas ash heating device for waste gasification and melting treatment facility, characterized by being discharged more .
(2) The dust ash heating apparatus for a waste gasification and melting treatment facility according to (1), wherein a cone portion is provided at a central portion of the rotary scraper.

ADVANTAGE OF THE INVENTION According to this invention, the dust ash heating of the waste gasification melting processing equipment which can heat-process the dust ash in the waste gasification melting processing equipment which gasifies and melts waste at a predetermined temperature uniformly An apparatus can be provided, and specifically, the following industrially useful remarkable effects are produced.
1) A rotating scraper and side wall protrusions are provided in the dust ash combustion chamber to widen the heating area and agitate the dust ash to efficiently heat to a uniform temperature.
2) Since the heat treatment of dust collection ash is provided in the ash extraction part of the combustion chamber, a heating source is unnecessary, and dioxins volatilized by the heat treatment are decomposed by the high-temperature gas in the combustion chamber. It is unnecessary.
3) Since the heating method is a solid radiation method from a refractory, the heating temperature is remarkably stabilized, and there is no contact between the heating body and the ash, so there is no problem of ash melt adhesion.

It is a longitudinal cross-sectional view of the ash heating apparatus of this invention provided in the combustion chamber lower part. It is a horizontal sectional view of AA shown in FIG. It is a horizontal sectional view of BB shown in FIG. It is detail drawing of the heating chamber shown in FIG.

  The best mode for carrying out the present invention will be described in detail with reference to FIGS. FIG. 1 is a longitudinal sectional view of the ash heating apparatus of the present invention provided at the lower part of the combustion chamber. FIG. 2 is a horizontal sectional view taken along line AA shown in FIG. FIG. 3 is a horizontal sectional view taken along line BB shown in FIG. FIG. 4 is a detailed view of the heating chamber shown in FIG. 1 to 4, 1 is a burner, 2 is a side wall, 2 'is a ring refractory material, 3 is a heat insulating refractory material, 4 is a rotating scraper, 4' is a shaving blade, 5 is a rotary drive device, and 6 is a heating chamber. , 7 are side wall protrusions, 8 is a dust collecting ash supply conveyor, 9 is a cooling gas blow-in port, 10 is a discharge port, 11 is a thermometer, and 14 is a cone part.

Conventionally, a screw conveyor system is generally used as a dust ash ash removal conveyor in waste gasification and melting processing equipment that gasifies and melts waste. In this method, the heating surface is narrow and only the surface layer is heated. There was a problem that heating could not be performed uniformly. Therefore, in the present invention, a rotary scraper system is adopted that can take a wide heating area, and the dust ash charged from one place on the outer wall is heated while rotating almost once and discharged from the discharge hole 10 at the bottom.
That is, the present invention is a dust collection ash heating device for heat treating dust collection ash in a waste gasification melting treatment facility for gasifying and melting waste, and in the combustion chamber 6 for heating the dust collection ash, An ashing device having a rotating scraper 4 is provided.

As shown in FIG. 2, the rotary scraper 4 is provided with a large number of radial shaving blades 4 '. The dust collecting ash is pushed by the shaving blades 4' to move in the rotational direction and rotates to the outer peripheral side. Also move. As shown in FIG. 4, the dust ash that has moved to the outer periphery is pushed back toward the center by the side wall projection 7 provided on the outer peripheral wall. By repeating this during rotation, the ash is stirred and uniform heating becomes possible.
Further, as a heating means, the ring-shaped refractory protrusion 2 'provided immediately above the rotating scraper is heated by the furnace gas, not directly from the high-temperature furnace gas having a large temperature fluctuation, and the solid from the refractory protrusion 2' is heated. By adopting a method of heating by radiation, stable heating can be realized.
Specifically, as shown in FIG. 1, a rotary scraper 4 is provided at the lower part of the combustion chamber 6, and a large number of shaving blades 4 'are connected thereto.
Dust ash is supplied from a dust ash supply conveyor 8 from one side of the combustion chamber 6, and the ash is moved in the circumferential direction by the scraper 4 ′ and rotated almost once. It is discharged outside.

  The dust ash is not only moved in the circumferential direction by rotation but also moved to the outer peripheral portion, but the ash that has moved to the outer peripheral portion is pushed back to the center side by the side wall projection 7 as shown by the arrow in FIG. By repeating this operation during one rotation, the ash is stirred and uniform heating becomes possible. On the other hand, regarding the heating method, the combustion gas from the combustion burner 1 is about 1000 to 1100 ° C., the combustion chamber lower side wall 2 and the ring-shaped refractory projection 2 ′ are heated by gas radiation and heat transfer, and the heating chamber 6 is heated. It acts as a solid radiation source for heating. In this case, silicon carbide refractories having a high emissivity and a high thermal conductivity are preferable for 2,2 ′. Further, in order to keep the temperature of the heating chamber 6 at an appropriate temperature (400 to 500 ° C.), as shown in FIG. 3, a cooling gas that forms a swirling flow in the furnace at the lower portion of the combustion chamber 6 and cools the refractory surface. Is supplied from the cooling gas inlet 9, and the temperature of the heating chamber 6 measured by the thermometer 11 is controlled by controlling the air volume by, for example, the TIC shown in FIG. It can be maintained at an appropriate temperature between 400-500 ° C. Note that the layer thickness and heating time of the dust ash at the bottom of the combustion chamber 6 can be freely controlled by changing the rotational speed of the rotary drive device 5.

DESCRIPTION OF SYMBOLS 1 Burner 2 Side wall 2 'ring-shaped refractory material 3 Thermal insulation refractory material 4 Rotating scraper 4' Shaving blade 5 Rotating drive device 6 Heating chamber 7 Side wall protrusion 8 Dust collection ash supply conveyor 9 Cooling gas inlet 10 Exhaust port 11 Thermometer 14 Cone Part

Claims (2)

A dust ash heating device for heat treating dust ash in a waste gasification and melting treatment facility for gasifying and melting waste,
The dust collection ash heating device is provided in the ash extraction portion of the combustion chamber of the waste gasification and melting treatment facility, and the ash extraction device has a rotating scraper,
The dust ash is supplied from one side of the side surface of the combustion chamber, is rotated once by the rotating scraper and then discharged from the bottom discharge port. Heating device. The dust ash heating apparatus for a waste gasification and melting treatment facility according to claim 1, further comprising a cone portion at a central portion of the rotary scraper.

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