JPS6134045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an incinerator suitable for treating municipal waste, particularly polymeric substances. When incinerated, polymeric substances have a high calorific value, some of them have the property of melting and dripping or clumping, and large amounts of black smoke, decomposition gas, etc. are generated, making them difficult to process in conventional incinerators. It is a material to be incinerated that has many problems, such as the fact that it can be incinerated, or even if it can be incinerated, the life of the furnace will be shortened. The present inventor completed the present invention as a result of intensive research to develop an incinerator suitable for processing such polymeric substances.

The present invention provides an incinerator having an inclined hearth 2 with an upper part directly below an incineration material inlet 6 and an ash outlet 7 as a lower part, and the hearth 2 has a continuous curved surface or a flat surface and is arranged in a staggered manner. The side wall of the furnace has many air inlets 9' along the surface of the hearth, and the material to be incinerated inlet 6 has a large number of air inlets 9 facing downward.
has a downward protrusion 11 on the ceiling of the furnace on the ash outlet side, and the lower end thereof is located lower than the top of the inclined hearth,
The gap between the top of the inclined hearth and the ceiling of the furnace communicates with the secondary combustion chamber 3, and the gap between the top of the furnace and the downward protrusion 1
1 and a flue inlet 10' on the side wall of the furnace in the upper part of the primary combustion chamber 1 surrounded by the hearth 2 and the side wall of the furnace.
The flue inlet and the secondary combustion chamber 1 are connected by a flue 10, and the flue inlet is connected to the secondary combustion chamber 1 by the flue 10.
This incinerator is characterized by having a structure that introduces combustion gas into the secondary combustion chamber 3.

The present invention will be explained in detail below with reference to the drawings. FIG. 1 is a longitudinal sectional view of the furnace of the present invention, FIG. 2 is a plan view, and FIG. 3 is a perspective view of the hearth. 1st
In the figure, the hearth 2 of the primary combustion chamber 1 is a continuous curved surface with the top directly below the incineration material inlet 6 and the ash outlet 7 at the bottom, and the downward air is arranged in a staggered manner. It has a large number of air inlets 9. Additionally, an air inlet 9' is provided on the side wall of the furnace along the surface of the hearth.
is provided. The materials to be incinerated are put into the furnace from the incineration material input port 6 and slide down while burning on the sloping hearth toward the ash outlet 7. At that time, the combustion gas blowing up from below and the hearth Under the influence of the hot air blown in from the air inlets 9 and 9' provided on the side wall of the furnace, they meander (slalom) and slide down as shown by the arrows in FIG.
The most distinctive feature of the furnace of the present invention is the slalom effect of the material to be incinerated, and as a result, the furnace of the present invention exhibits an effect of significantly higher combustion efficiency than conventional furnaces. Some of the combustion gas blowing up along the hearth in the primary combustion chamber 1 goes over the upper part of the hearth and directly to the secondary combustion chamber 3, but most of it is sent to the ceiling of the furnace at the inlet 6. The ash is blocked by the downward protrusion 11 provided on the ash outlet side and circulated to the upper part of the primary combustion chamber.
A part of this recirculated gas enters the flue inlet 10' provided on the side wall of the furnace and passes through the flue 10 to the flue outlet 1.
0'' to the secondary combustion chamber 3. In the secondary combustion chamber 3, new air is supplied from the air inlet 9'', so that the incompletely combusted gas is completely combusted here. The combusted gas passes through the flue 4 and is released into the atmosphere from the chimney 5, but during this time there are various preheating chambers for air to be blown out from 9, 9' and 9'', although not shown in the figure. Install waste heat utilization equipment, dust removal equipment, flame extinguishing equipment, etc. as necessary.
On the furnace wall of the next combustion chamber, there is an auxiliary burner 8, a viewing window 13,
Depending on the type of material to be incinerated, it is preferable to provide an inspection port 12 or the like for breaking the bridge of slag generated at the ash outlet 7. Furthermore, it is also preferable to provide equipment such as a conveyor around the input port 6 to help input the material to be incinerated, and to provide an ash removal conveyor at the ash removal port 7 to assist in removing the ash.

Depending on the type of material to be incinerated, the shape and slope of the curved surface of the hearth may be convex upward, convex downward, S-shaped, inverted S-shape, etc., taking into account its specific gravity, combustion phenomenon, moisture content, etc. Selected appropriately.

In the furnace of the present invention, most of the combustion gas (90 to 70
%) is bypassed through the flue pipe 10 and routed to the secondary combustion chamber, the amount of combustion gas passing through the top of the inclined hearth is reduced (10 to 30%), and the incineration material input port 6
This controls the combustion of the materials to be incinerated that accumulate near the downward protrusion 11. In other words, when a large amount of combustion gas is applied to this accumulated material to be incinerated, intense combustion only occurs at the top of the inclined hearth, causing the balance in the furnace to collapse and incompletely combusted gas to exceed the incineration capacity of the secondary combustion chamber 3. This makes normal combustion difficult. Furthermore, by extracting most of the combustion gas from the upper part of the primary combustion chamber 1, circulation of the combustion gas occurs within the primary combustion chamber 1, and the combustion gas blows up along the hearth and the hearth and furnace. The materials to be burned on the hearth are fluidized by the air from the air inlets 9 and 9' provided on the side wall of the hearth, and the combustion materials on the hearth are subjected to an upward force due to the large amount of combustion gas blown up along the hearth. This prevents it from falling excessively and allows it to slide down the hearth slowly. As a result, the material to be incinerated swings from side to side due to the slight agitation of the airflow within the furnace, resulting in sufficient so-called meandering. In particular, when polymeric substances are burned, a flammable liquid is generated at the top of the inclined hearth and flows down the hearth, but it quickly flows down due to the wind that blows up along the hearth caused by the circulation of combustion gas. This prevents ripples on the liquid surface, causing it to sway and meander from side to side, making it possible to achieve uniform combustion, thereby increasing combustion efficiency.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view, FIG. 2 is a plan view, and FIG. 3 is a perspective view of the hearth.

Claims (1)

[Claims] 1. In an incinerator that has an inclined hearth with the top directly below the incineration material inlet and the ash outlet at the bottom, the hearth has a continuous curved surface or a flat surface and has downward air inlets arranged in a staggered manner. The furnace has a large number of air inlets along the surface of the hearth on the side wall of the furnace, and has a downward protrusion on the ceiling of the furnace on the ash outlet side of the incineration material input port, the lower end of which is sloped. It is located lower than the top of the hearth, and the gap between the top of the sloping hearth and the ceiling of the furnace communicates with the secondary combustion chamber, and is further connected to the ceiling of the furnace, the downward protrusion, the hearth, and the side walls of the furnace. A flue inlet is provided on the side wall of the furnace above the primary combustion chamber, and the flue inlet and the secondary combustion chamber are connected by a flue. An incinerator characterized by having a structure for introducing combustion gas into a secondary combustion chamber.