JPH04110512A - Refuse incinerator - Google Patents

Abstract

PURPOSE:To prevent blockages of a grate and nozzles and abnormal combustion caused by covering over combustion flames by providing upper buffer shelves which take the impact of refuse falling into a furnace. CONSTITUTION:Upper buffer shelves 18 are located below the upper ends of water tubes 14 in a furnace so as not to interfer the gas vent path function of the water tubes 14. A first shelf water tube 18a, a constitutional member of the buffer shelves 18, is laid though the center of the furnace and both ends are connected to the wall of a water jacket, and a second shelf water tube 18b is laid parallel to the first shelf water tube 18a, located at a lower level than the first one 18a and connected to the wall of the water jacket by a shelf rising pipe 18c so that it is capable of sufficiently bearing the impact of falling refuse and the generated steam is allowed to being easily discharged. The first shelf water tube 18a is held by a shelf rising pipe 18d. When a heavy roll 19 of plastic sheet or the like is fed from a feed port 20, the roll strikes against the buffer shelves 18 and its impact to an ash pile on a grate 6 is diminished. Moreover, as the roll does not fall directly on the ash pile, blockages of the grate 6 and combustion air nozzles are prevented.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to waste incinerators, particularly small incinerators, which are capable of reducing in-furnace abnormal combustion and loss of waste that may occur in the furnace when waste is incinerated in the furnace. The present invention provides a structure for a waste incinerator that prevents clogging of combustion air nozzles.

<Prior art and its problems> Figures 5 and 7 show the structure of a waste incinerator that was previously proposed and implemented by the inventor.

Conventionally, this type of incinerator was operated only during the daytime for 8 to 10 hours by incinerating waste by inputting it through the waste input port 5.The operator would input a large amount of incinerated material before leaving work and set the fan to continuous operation. I left the company. However, due to the accumulation of unburned materials on the rosdol or the occurrence of a phenomenon of blockage in the upper part of the deposits, the ash discharged the next morning contains a large amount of unburned materials. Therefore, if unburned gas remains in the furnace at this time, there is a risk of an explosion within the furnace. Furthermore, to describe the structure of the conventional device in front of FIGS. 5 and 7 with reference to FIGS. 9 and 10, the waste incinerator 1
Usually, a furnace with a circular cross section is adopted, and the inner wall of the furnace is formed by a water jacket 3 including an air supply pipe 2, and the combustion air is supplied from a plurality of nozzles 4 of the air supply pipe that penetrates the inner wall surface of the water jacket 3. The materials to be incinerated are fed into the furnace from the supply port 5. At the bottom of the furnace, there is provided a rosdol 6 formed of a water pipe or the like, and the ash is taken out from an ash basin 7 at the bottom with a shovel or the like. The combustion residue on the Rosdol is taken out from the takeout port 8. Cooling water 9 is supplied to the water jacket 3 from the nozzle 10, receives heat in the water jacket, and becomes a steam/water mixture 1.
It is sent out from the second nozzle 11. Also, air supply pipe 2
Air is supplied from pipes 13a and 13b.

This small-sized incinerator experienced abnormal combustion in the furnace, which does not normally occur in large-scale equipment or models that transport waste horizontally, due to the accumulation of unburned gas due to bridging of the materials to be incinerated. In that case, the only problem was the scattering of incinerated ash, but countermeasures must be taken to ensure safe driving. When we examine the cause of the accident, we find that the records of the handlers show that it is due to co-combustion of materials such as paper and vinyl materials, which generate a large amount of heat, and the amount of incineration per unit time is also large. Understood. The melted vinyl material and the bags made of the same material adhere to the furnace wall to hold the semi-melted unburned paper that is to be incinerated, forming a lid over the inside of the furnace and steaming the waste thrown in. As a result, unburned gas accumulates between the material being incinerated at the bottom and the material used as the lid, and incomplete combustion continues, and at that time, fresh outside air is released by accidentally removing the ash. It is estimated that when the gas flows in, the flammable gas ignites and abnormal combustion occurs.

Therefore, a need has arisen for an apparatus having a structure that prevents this type of flammable gas from accumulating in the furnace.

For this reason, the inventor first proposed a countermeasure for this problem in Japanese Patent Application No. 2-135.
I have filed application No. 278. A device according to one embodiment is shown in FIGS. 5 and 6, in which a water pipe 14 is provided in the furnace parallel to the water wall, and combustion gas accumulates in the vicinity of the lower rostrum 6. A combustion gas vent passage 15 is formed to prevent an explosion within the combustion chamber. As a result of operating the apparatus shown in the above drawings according to an embodiment of the present invention, combustion was carried out suitably, and when inspected during suspension of operation, the number of nozzle blockages was approximately 1/8 of that in the case of the conventional apparatus, and combustion ash was observed. There were no solidified lumps and the color of the ash was white, indicating good combustion.

However, on the other hand, when a roll of synthetic resin sheet or a roll of synthetic resin-covered paper is put into the furnace as incineration material, the molten resin before combustion combines with the combustion ash, and When the introduced roll falls onto the ash pile, the compacted mass mixed with the ash and molten resin causes clogging of the lower rosdol due to the impact of the fall, and at the same time, the level near the level of the lower rosdol is clogged. This caused a problem in that the nozzle in the water wall located in the area became clogged and the operation of the combustion equipment had to be stopped. Therefore, it is important not to drop the roll directly onto the ash pile, and it has become necessary to propose a device to prevent this.

FIGS. 7 and 8 are cross-sectional views of a waste incinerator in which the furnace described as the second embodiment of the patent application has a membrane wall structure.

<Purpose of the Invention> The present invention provides a method for preventing incineration from occurring in the furnace by blocking the upper part of the combustion flame even if more than a specified amount of material to be incinerated is accidentally thrown into the furnace, or even if a large bag-like object is thrown into the furnace. To provide a structure of a waste incinerator that does not pose the risk of abnormal combustion and does not cause clogging of loss dollars or combustion air supply nozzles even when heavy rolls such as synthetic resin-covered sheets are introduced. The purpose is to

Overview of Means for Combustion> In summary, the present invention is characterized in that, in a waste incinerator surrounded by a water wall and having a plurality of combustion air supply nozzles, an upper shelf for buffering thrown objects is provided in the furnace. This is a waste incinerator.

<Example 1> FIGS. 1 and 2 are cross-sectional views of a waste incineration apparatus in which the apparatus of FIGS. 5 and 6 is provided with the apparatus of the present invention. As shown in the figure, an upper shelf 18 for buffering is provided below the upper end of the water pipe 14 so as not to impair the function of the combustion gas vent passage through the water pipe 14 in the furnace.
It is intended to provide

As shown in the figure, this buffering upper shelf 18 has a first shelf water pipe 18 which is a component thereof, which passes approximately through the center of the furnace and connects the wall surfaces of the water jackets, and is approximately 15 mm horizontally.
It is intended to provide a good outlet for the steam generated by tilting it.

Furthermore, the second shelf water pipe 18b is similarly provided substantially parallel to the first shelf water pipe 18a, and its horizontal level is lower than this. The second shelf water pipe 18b is connected to the wall of the water jacket by a shelf rising pipe 18c so as to sufficiently withstand the impact of falling objects such as heavy rolls, and to facilitate the delivery of generated steam.

The first shelf water pipe 18a is a shelf rising pipe 18 as shown in FIG.
It can be held at d.

In addition, it is preferable that the hole diameter of the combustion air nozzle located at a level near the level of the Rosdol 6 and the shelf water pipe is made large to prevent clogging by lumps of molten synthetic resin and combustion ash.

<Embodiment 2> FIGS. 3 and 4 are cross-sectional views of an apparatus in which an upper buffer shelf is provided in an apparatus in which a furnace is surrounded by a membrane wall. The upper buffer shelf 18 is a first shelf water pipe 18a.

They consist of a second shelf water pipe 18b and a shelf rising pipe 18cs18d. In this case, these water tubes are connected at their ends with water tubes forming the membrane wall to facilitate the discharge of the steam generated in the tubes.

Effect> When the heavy roll 19 of synthetic resin sheet etc. is introduced into the supply port 2o, it collides with the buffer shelf 18, weakening the impact force on the ash accumulation on the rosdol, and directly hitting the ash accumulation. Since it does not fall, there is no chance of clogging of the loss dollar 6 or the combustion air nozzle.

Also, as shown in the figure, when the weight roll 19 is placed on the upper buffer shelf 18, the high temperature combustion gas from the combustion gas venting passage 15 and sufficient combustion air are supplied to the heavy roll on the shelf and the weight roll is combusted. The melt will not clog the loss dollar or combustion air nozzle.

By implementing the present invention, the continuous operation time of the waste incinerator could be significantly extended. In addition, because the combustion is good, the incineration ash is white and burns well, and the quantity is also high! I was able to confirm that the amount of water has decreased significantly.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the device according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ of FIG. 1, and FIG. 3 is a longitudinal cross-section of the device according to the second embodiment of the present invention. 4 is a sectional view taken along IV-rV in FIG. 3, FIG. 5 is a vertical sectional view of the waste incinerator proposed earlier by the inventor, and FIG. 6 is a sectional view taken along I-I in FIG. 5. , FIG. 7 is a vertical cross-sectional view of another embodiment of the proposal, FIG. 8 is a cross-sectional view taken along the line ■-■ of FIG. 7, and FIG. 9 is a vertical cross-section of the device showing problems with the conventional device before the proposal. The plan view and FIG. 10 are partial cross-sectional views showing the relationship between the water jacket and the combustion air supply nozzle. 1...Waste incinerator 3...Water jacket 6...Rosdol 14...Water pipe 18
...Buffering upper shelf 18a...First shelf water pipe 18b...Second shelf water pipe xsc, isa...Rising pipe for shelf Fig. 1, Fig. 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A waste incinerator surrounded by a water wall having a plurality of combustion air supply nozzles, characterized in that an upper shelf for buffering thrown materials is provided in the furnace. Incinerator. 2. The waste incineration apparatus according to claim 1, wherein the buffer shelf extending inside the furnace is formed of a plurality of shelf water pipes inclined with respect to the horizontal. 3. The waste incineration device according to claim 1 or 2, characterized in that the water pipe of the buffer shelf and the water wall are connected by a riser pipe for the shelf.