JP2738808B2 - Indirect ash melting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indirect melting device for incinerated ash.

[0002]

2. Description of the Related Art Volatile components are contained in components such as incineration ash, which foam at a high temperature, and thus need to be degassed. Conventionally, the incineration ash is sequentially melted from the surface of the incineration ash by a burner, and there are various apparatuses for performing this method, such as an inclined reflection furnace, a rotating melting furnace, and an electric melting furnace.

[0003]

In the furnace described above, dust often scatters to the outside due to exhaust gas or the like. In addition, since the melting depends only on the radiation heat transfer, the equipment has to be enlarged due to the necessity of the area of the ash surface and the like. Further, in the electric melting furnace, although scattering of dust can be suppressed, the melting energy cost is extremely high, and the consumption of electrodes and the like is severe.

[0004]

In order to solve the above problems, the present invention provides a heating burner in a tangential direction of a furnace body,
The furnace body was charged with an indirect ash melting indirect heating cylinder, the lower part of the indirect melting furnace was configured into a tapered shape, and an ash forcible charging insertion device was provided in the upper part of the ash melting indirect heating cylinder. It is characterized by the following.

Further, the present invention is characterized in that a burner for preventing molten ash solidification is provided at an outlet of the ash fusion indirect heating cylinder.

Further, the present invention is characterized in that a plurality of ash melting indirect heating cylinders are charged in a furnace.

Further, the present invention is characterized in that the ash forcibly charging device comprises a vibration hopper and an ash pushing device.

Further, the present invention is characterized in that the ash forcing device supplies the material under gas pressure.

Further, the present invention is characterized in that an alternating combustion burner for alternately burning two burners having a heat storage unit is installed in a furnace body as a heating burner.

[0010]

The inside of the furnace is heated to 1200 to 1600 ° C. by the combustion gas ejected tangentially from the heating burner. The ash melting indirect heating cylinder charged in such a furnace,
The material is heated from the outside by the high temperature, and indirectly heats the material to be melted therein. The material to be melted, ie, the ash,
It gradually melts from the surface and liquefies completely at the lower part of the ash fusion indirect heating cylinder and falls into the melt receiver. Since the melt solidification prevention burner is provided at the outlet of the ash melting indirect heating cylinder, it can be dropped into the melt receiver as a complete melt without any trouble. The ash is supplied to the ash melting indirect heating cylinder by, for example, a vibration hopper and a pushing device under a gas pressure. At this time, the inside of the ash melting indirect heating cylinder has a function of insulating the upper part of the ash forcing device by the powdery ash layer before melting. Melting under pressure by the above-mentioned gas can suppress the rise of volatile components such as harmful metals, and can solidify them while keeping them contained in the molten material. Can be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 denotes a furnace body, and 2 denotes the furnace body 1.
Is a heating burner installed in the tangential direction. The furnace body 1
Inside, the ash fusion indirect heating cylinder 3 is inserted, and the lower part of the ash fusion indirect heating cylinder 3 is configured as a tapered portion. Ash melting indirect heating cylinder 3
An ash forcing device 4 is provided on the upper part of the device. An outlet 5 of the ash fusion indirect heating cylinder 3 is provided with a melt solidification prevention bar.
A nut 6 is provided. The ash forcing device 4 comprises, for example, a vibration hopper 7 and an ash pushing device 8.

As the heating burner 2, a so-called alternating combustion burner can be installed. The conventional furnace melts the ash by direct heating, so that an alternating combustion burner cannot be used.However, since the apparatus of the present invention has the above-mentioned unique configuration, the thermal efficiency is improved by using the alternating combustion burner. I can do it. When installing an alternating combustion burner,
It does not have to be tangential. The alternating combustion burner refers to a burner in which two burners each having a heat storage unit are alternately switched to burn.

The inside of the furnace body 1 is heated to 1200 to 1600 ° C. by a combustion gas jetted tangentially from a heating burner 2. The ash melting indirect heating cylinder 3 charged in the furnace body 1 is heated from the outside by the high temperature, and indirectly heats the material 9 to be melted therein. The material 9 to be melted, that is, the ash gradually melts from its surface, and is completely liquefied at the lower part of the ash fusion indirect heating tube 3 and falls into the melt receiver 10. Since the melt solidification prevention burner 6 is provided at the outlet portion 5 of the ash fusion indirect heating cylinder 3, it can be completely dropped into the melt receiver 10 without any trouble. The ash is supplied to the ash melting indirect heating tube 3 by, for example, a vibration hopper 7 and a pushing device 8 under a gas pressurization. At this time, the inside of the ash fusion indirect heating cylinder 3 has a function of insulating the ash forcing device 4 by the powder ash layer 11 before melting. In addition, it is possible to suppress the rising and discharging of harmful metals and the like under pressurization by gas, and to solidify them while keeping them contained in the melt, so that the amount of discharged substances can be extremely reduced.

[0014]

Since the present invention is as described above, the following effects can be obtained. Because of the indirect heating method in which the combustion products do not come into contact with the ash, scattering of dust can be minimized. Since the heat transfer area can be increased with respect to the amount of ash charged, the furnace can be made more compact.
Since the upper part in the ash fusion indirect heating cylinder forms an insulating layer of undissolved ash, there is no thermal influence on the supply system, and there is no need to provide a special device for heat insulation. The throughput can be easily controlled by adjusting the furnace temperature. An alternating combustion burner can be used, and the thermal efficiency can be improved. Even if the basic unit is small, 1000 units
The operation cost is as low as ２０００2000 kcal / kg, which is about half that of the electricity bill. Harmful metals and the like can be solidified while being contained in the material to be melted, and the emission amount of the substance can be extremely reduced.

[0015]

[Brief description of the drawings]

FIG. 1 is an overall detailed explanatory diagram.

FIG. 2 is an explanatory sectional view of a main part.

[Description of Signs] 1 Furnace 2 Heating burner 3 Ash melting indirect heating cylinder 4 Ash forcing charging device 5 Outlet 6 Burner for preventing solidification of melt 7 Vibration hopper 8 Push-in device 9 Melted material 10 Melt receiver

Claims (6)

(57) [Claims] 1. A heating burner is installed in a tangential direction in a furnace body, and an ash fusion indirect heating cylinder is inserted into the furnace body, and a lower portion of the fusion indirect heating cylinder is formed into a tapered shape. An indirect ash melting device characterized in that an ash forcing device is provided at the upper part of the indirect melting tube. 2. The indirect ash melting apparatus according to claim 1, wherein a burner for preventing solidification of the melt is provided at an outlet of the indirectly heating ash melting cylinder. 3. The indirect ash melting apparatus according to claim 1, wherein a plurality of ash melting indirect heating cylinders are charged in the furnace. 4. The indirect ash melting and heating apparatus according to claim 1, wherein the ash forcing device comprises a vibration hopper and an ash pushing device. 5. The indirect ash melting and heating apparatus according to claim 1, wherein the ash forcing device supplies the material under pressure. 6. An alternating combustion burner which alternately burns two burners having a heat storage section is provided in a furnace body as a heating burner.