JPS6029509A - Method of throwing waste into incinerator - Google Patents

Abstract

PURPOSE:To decrease the construction cost of an incinerator by making the height of the range of an equipment low by providing an inclined ceiling in the middle part of a free board so that waste can be charged into the center part of a furnace without letting the waste move along the wall of a furnace. CONSTITUTION:An inclined ceiling 11 is provided in the middle of a free board 1 in an incinerator 10, where a waste loader 6 is horizontally provided. The loader 6 is designed so that it can charge waste into the center part of a fluidized bed 2 from an opening 5 at the end of a loader 6, without moving along the wall of a furnace. The height ''h'' of an opening 5 is to be determined suitable for each equipment in accordance with the state of waste to be incinerated. The position of a loader opening 5 is to be determined to come to the center of a fluidized bed 2 by changing the inclination theta of an inclined ceiling in accordance with the change in the height ''h'' of a loader opening. with such an arrangement, the construction cost of an incinerator can be decreased, as well as to maintain the burning state at high efficiency, and to extend the lifetime of a refractories.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for charging materials to be incinerated into an incinerator, particularly a fluidized bed incinerator. In conventional fluidized bed incinerators, materials to be incinerated are fed through a chute from a feeder through an inlet provided at the center of the top of the furnace or at the side wall of the freebore P section. When the inlet is installed at the top of the furnace, the incineration material feeder, the inlet hopper, etc. must be placed at the top, which inevitably increases the height of the equipment such as the inlet crane. In addition, when two or more series of such equipment are installed, a column is required between the incinerator bodies to support the incineration material feeder installed at the top of the incinerator, and the columns can only have cross beams in one direction, which reduces structural strength. The incinerator had to be quite thick, which had the disadvantage of increasing the civil and construction costs and, by extension, the construction cost of the entire incinerator. From the viewpoint of combustion, in order to obtain efficient combustion conditions, it is better to change the height position of the inlet from the fluidized bed interface for each incinerator depending on the dry base calorific value and moisture content of the incinerated material. This is a good idea, but in reality, the ceiling heights of the incinerators were kept at the same level, which meant that efficient combustion conditions could not be achieved.

Next, if the input port is installed on the side wall of the 7-ribbon boat, the chute will need to be sloped, and the chute will be heated to 900℃.
Because it faces a nearby heated freeboard, it is protected by refractories, but it is still quite hot due to radiant heat. Since the materials to be incinerated are put in contact with this chute surface, there are problems such as spalling of refractories in the case of materials with a high moisture content, and burning on the chute surface in the case of plastics or other easily flammable materials. . For this reason, water cooling or indirect air cooling is required, and in order to achieve even more efficient combustion, the input port position and chute angle must be changed so that the incinerated material falls into the center of the fluidized bed, and secondary air cooling, etc. It was necessary to blow it away.

When blowing away with secondary air, there is a disadvantage that if the secondary air inlet is located too close to the fluidized bed interface, the temperature of the fluidized bed will be lowered, and the incineration material input port must be installed at the top of the freeboard. There were drawbacks.

This invention aims to eliminate these drawbacks, and relates to a charging method in which a slanted ceiling is provided in the middle of the freeboard, and the materials to be incinerated are charged into the center of the furnace without being placed along the furnace walls. be.

To explain the figures, FIGS. 1 to 6 show conventional fluidized bed incinerators. In FIG. The incinerated material is sent by the incinerated material feeder 6, and is sent to the chute 4.
After that, it is fed into the furnace through the inlet at the top of the furnace. Note that 6 indicates an exhaust gas outlet, and α indicates the flowing air blowing direction.

FIG. 2 shows an example in which the materials to be incinerated are supplied to the side wall of the furnace, and the materials to be incinerated are sent by the incineration material feeder 6 through the diagonal chute 4 and then from the input port 5 opened in the side wall of the free board 91 into the furnace. It is put inside. Reference numeral 8 denotes a secondary air inlet for blowing away the baked-on substances on the furnace wall.

Other same symbols as in FIG. 1 represent the same parts.

In FIG. 2, the incineration material feeder is shown as a screw set feeder, whereas in FIG. 6, the incineration material feeder 6 is shown as a rotary pulp type feeder.

Reference numeral 8 designates a secondary air inlet for air cooling the chute surface of the input chute 4 and for blowing off baked-on matter. The same reference numerals as in FIGS. 1 and 2 represent the same parts.

These conventional incinerators had various drawbacks as mentioned above. The present invention is intended to eliminate these drawbacks, and FIG. 4 shows an example of an incinerator for implementing the method of the present invention. A material to be incinerated feeder 6 is horizontally attached thereto, and the material to be incinerated is fed into the center of the fluidized bed 2 from an inlet 5 at the tip of the feeder without being placed along the furnace wall. Further, as mentioned above, it is desirable to set the input height to an appropriate height for each equipment depending on the properties of the incinerated material. Therefore, by changing the inclination θ of the sloping ceiling according to the change in h, the inclination θ is determined so that the position of the inlet 5 is at the center of the fluidized bed 2.

The other embodiment shown in FIG. 5 differs from that shown in FIG. 4 only in that the tip of the incineration material feeder 6 and the input port 5 of the inclined ceiling part 110 are connected by a vertical chute 4. The points are exactly the same as in the case of FIG.

The present invention provides a method for introducing materials to be incinerated as described above, in which a sloping ceiling section is provided in the middle part of the free board, and the materials to be incinerated are thrown into the center of the furnace without being placed along the furnace wall. It was possible to lower the height of a series of equipment, which had the effect of significantly lowering the construction cost of incineration equipment. In addition, the inlet position can be set appropriately for each piece of equipment according to the properties of the incinerated material, and a highly efficient combustion state can be obtained. Furthermore, since it does not come into contact with high-temperature refractories such as furnace walls, there is no need for special water cooling or indirect or direct air cooling, which is highly effective in solving problems such as spalling of refractories and burning of incinerated materials. have Furthermore, since there is no need to blow away the incinerated material by equal pressure of the secondary air, the secondary air port can be installed at an appropriate position for combustion.

As described above, this invention has produced great effects such as reducing the construction cost of incineration equipment, maintaining a highly efficient combustion state, and extending the life of refractories.

[Brief Description of the Drawings] Figures 1 to 3 are diagrams showing a conventional fluidized bed incinerator. 4 and 5 show different embodiments of fluidized bed incinerators implementing the method of the invention, respectively. Explanation of symbols 1...Free board 2...Fluidized bed 5...Input port 6...Incineration material feeder 7...Input hopper 8...
・Air inlet 10...Incinerator 11...Sloped ceiling agent Patent attorney (8107) Kiyotaka Sasaki (and 6 others) Figure 1 Figure 3

Claims (2)

[Claims] (1) An incinerator characterized in that a fluidized bed incinerator is provided with a sloping ceiling in the middle of the free board so that the materials to be incinerated are fed into the center of the furnace instead of along the furnace walls. How to put in the incineration material. (2) A patented method for introducing materials to be incinerated into a fluidized bed, which is characterized by changing the angle of the sloped ceiling so that the height from the fluidized bed interface can be adjusted to suit the properties of the materials to be incinerated.