JPS5928811B2 - melting furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a passage for discharging the melted material together with high-temperature exhaust gas from the downward opening of the melting chamber, and a device for cooling and taking out the melted material from the passage. The present invention relates to a melting furnace equipped with a flue for discharging high-temperature exhaust gas, and more particularly, to an improvement of a device for taking out a melted product.

That is, in order to cool and take out the molten product, a water tank is generally provided with a seal against high-temperature exhaust gas, the molten product is fed down into the water tank and solidified by water cooling, and the cooled and solidified product is One end is immersed in a water tank and collected by a conveyor or the like.

However, there is a problem in that the temperature inside the melting chamber decreases due to the steam generated during cooling, leading to a loss of thermal energy for melting, and a large amount of cooling water must be supplied, making it difficult to run. This increased costs and was extremely uneconomical overall.

Furthermore, as a result of rapidly cooling the molten material by water cooling, the treated material becomes finer as it cools, which is disadvantageous in terms of handling such as transportation and storage in post-processing and post-use as construction aggregate.

In view of the above points, the present invention makes it possible to cool a molten product while suppressing both thermal energy loss and running costs, and adds a simple structure to the structure for slow cooling. The purpose is to promote this process and to obtain a cooled solidified product that is advantageous in terms of handling in post-processing and post-use.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

A storage and supply section 1 is provided in the upper part of the melting chamber 2 for supplying and storing materials to be treated such as concentrated sludge obtained from water treatment systems such as urban sewage and industrial wastewater, urban dust and industrial waste, and a storage supply section 1 is provided in the upper part of the melting chamber 2. A passage 4 for discharging high-temperature exhaust gas through the downward opening 3 of the melting chamber 2 is provided, and a device 5 for cooling and taking out the melted material falling through the passage 4 is provided. A flue 6 is provided for discharging the material separately from the material to be treated, whereby the material to be treated is melted, odor components generated due to melting are incinerated and deodorized, and discharged as exhaust gas through the flue 6. The melting furnace is configured to cool and solidify the melting treatment plant and recover it as a solidified product.

The take-out device 5 includes a funnel-shaped filling tank that extends over the entire circumference of the cylindrical portion 8 constituting the fall path 7 for the melted material that connects to the passage 4 and has a gap formed at the bottom thereof. 9, and a supply section 10 for supplying sand as an example of a granular cooling medium to the filling tank 9, and a supply section 10 for supplying sand as an example of a granular cooling medium to the filling tank 9, and a supply part 10 for supplying sand as an example of a granular cooling medium to the filling tank 9. The conveying device 12 can be received in a blocking state.
The filling tank 9 is supplied with sand and sealed against high-temperature exhaust gas, and the molten material is dropped onto the filled sand and slowly cooled and solidified.
The structure is such that the cooled and solidified material is taken out together with the sand by a conveying device 12.

A separating device 13 is provided in series with the conveying device 12,
The cooled and solidified molten material is separated by sieving and collected in a recovery device 14, and the separated sand is transferred to the supply section 10 by a lifting device 15 and is configured to be used for circulation. be.

The upper part of the filling tank 9 is closed by a lid member 16 connected to the cylindrical part 8, and a water seal structure 17 is provided between the two parts 9 and 16, respectively.
, 17 are interposed therein, and a rotary member 18 is provided to be rotatable around the vertical axis 2, and a leveling plate 19 is provided at a predetermined interval in the circumferential direction from the rotary member 18. A motor 20 is interlocked with the rotating member 18 via a gear type transmission mechanism 20, and a supply provided at one location in the circumferential direction of the lid member 16 is provided, and a motor 20 is interlocked and connected to the rotating member 18 via a gear type transmission mechanism 20. The structure is such that the sand supplied to the filling tank 9 from the section 10 is leveled, and the entire inside of the filling tank 9 is uniformly filled with sand.

a first supply device 22a disposed on the upper side of the filling tank 9 in the conveyance direction to supply sand for slow cooling to the conveyance device 12;
A sand supply device 22 consisting of a second supply device 22b disposed on the lower side is provided, and the first supply device 22H supplies sand in a layered manner to the conveyance surface of the conveyance device 12, and a filling tank 9 is placed on top of the sand. The second supply device 22b supplies sand from above the discharged filling to cover the entire discharged filling with sand and promote slow cooling. It is.

Each of the first and second supply devices 22a and 22b is provided with a midway point of its conveying cylinder 23 in contact with the filling tank 9, and the sand to be supplied to the conveying device 12 is removed from the filling tank 9 before being supplied. The sand is preheated by heat transfer to reduce the temperature difference between the discharged filling and the sand supplied from both supply devices 22a and 22b, and is configured to better perform slow cooling of the molten material. .

It is preferable to use the sand that has been sized from about 4 to 5 rILm square to about 28 mesh from the sealing surface, or a mixture of these various particle sizes. It is not limited to the particle size.

In addition, the granular cooling medium is not limited to sand as mentioned above.
For example, various materials can be used, such as ceramic balls, as long as they are heat resistant and will not be melted when receiving the molten object and can be reused.

In the above embodiment, the first and second supply devices 22a and 22b are provided as the supply device 22 in order to cover the discharged filler from both upper and lower surfaces in order to supply sand as a granular cooling medium for slow cooling. However, in the present invention, only one of them may be provided.

The cooled and solidified product taken out during the above-mentioned melting process is used for various purposes, such as paving stones for roads and railways, aggregate for construction, and filter media for filling in filtration devices.

In summary, the present invention provides the above-mentioned melting furnace, in which the take-out device 5 is provided with a tank 9 filled with granular cooling medium for receiving the melted material and sealing against high-temperature exhaust gas, and At the bottom of the tank 9, there is a conveying device 1 that receives the filling material in a state where its natural outflow is prevented.
2, and the conveying device 12 is provided with a device 22 for supplying a slow cooling granular cooling medium for coating at least one of the upper and lower sides of the packed material to be taken out, and the packed material taken out by the conveying device 12 is The present invention is characterized in that it is provided with a device 13 that separates the liquid into a cooling medium and a processed material.

In other words, since the melted material is cooled by contact with the granular cooling medium, it is possible to avoid generation of steam during cooling and adversely affect the temperature inside the melting chamber 2, thereby suppressing loss of thermal energy, and As a cooling medium, sand and other inexpensive and easily available materials can be reused and running costs can be reduced.

In addition, the conveyance device 12 provided for taking out the molten material can be effectively used, and even though it is a simple addition of a device 22 for supplying the granular cooling medium for slow cooling, the conveyance device 12 that is provided for taking out the molten material can be transported. By suppressing atmospheric heat radiation during the process and promoting slow cooling, it is possible to obtain a cooled and solidified product of the desired size with the desired hardness, making it easy to handle in post-processing and post-use. I was able to do it to my advantage.

[Brief explanation of drawings]

The drawing is an overall vertical sectional view illustrating an embodiment of the melting furnace according to the present invention. 2... Melting chamber, 3... Downward opening, 4
...Aisle, 5...Takeout device, 6...
... Flue, 9 ... Filling tank, 12 ...
・Transport device, 13...Separation device, 22...
...Supplying device, 22a...First feeding device, 22
b...Second supply device.

Claims (1)

[Scope of Claims] 1. A passage 4 is provided for discharging the molten material together with high-temperature exhaust gas from the downward opening 3 of the melting chamber 2, and a device 5 is provided for cooling and taking out the molten material from the passage 4. The melting furnace is equipped with a flue 6 for discharging high-temperature exhaust gas from the furnace, and the take-out device 5 includes a tank 9 filled with granular cooling medium for receiving the melted material and sealing against the high-temperature exhaust gas. A conveying device 12 is provided at the lower part of the filling tank 9 to receive the filled material in a state that prevents its natural outflow, and the conveying device 12 is provided with at least one of the upper and lower sides of the taken-out filled material. A melting method characterized in that a device 22 for supplying a granular cooling medium for slow cooling for coating is provided, and a device 13 is provided for separating the filling taken out by the conveying device 12 into a cooling medium and a processed material. Furnace. 2. The supply device 22 is configured by providing a first supply device 22a that supplies the granular cooling medium in a layered manner to the conveyance surface of the conveyance device 12 before receiving the filling material, and also includes 2. The melting furnace according to claim 1, further comprising a second supply device 22b for supplying the cooling medium from above the filled material. 3. The supply device 22 is provided in contact with the filling tank 9 so that the cooling medium therein is preheated by heat transfer from the filling tank 9 before being supplied to the transport device 12. A melting furnace according to claim 1 or 2.