JPH11287558A - Method and device for drying garbage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the drying efficiency of garbage, discharged out of a town, and make an air stream drying means compact. SOLUTION: A garbage drying device is provided with a garbage transfer conveyor 11, transferring garbage 10, from which iron constituent, aluminum constituent or the like is separated, a hopper 12, charging the transferred garbage and, thereafter, crushing the same, a constant amount of garbage supplying means 13, supplying the constant amount of crushed garbage, a vertical type air stream drying means 14, drying the garbage, supplied by the constant amount of garbage supplying means 13, a hot air generating furnace 15, sending the hot air having a temperature of 200 deg.C from the lower end unit of the air stream drying means 14, a cyclone 16, separating the garbage, heated and burnt by the hot air, into waste gas and solid constituents, a hot air circulating blower 17, sending the waste gas, discharged out of the cyclone 16, into the hot air generating furnace 15, and a heat recovery route 19, sending a part of the waste gas into the hopper 12 through a hot air supplying blower 18 as the hot air 19a of the waste gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for drying garbage, which improve the drying efficiency of garbage discharged from cities and reduce the size of flash drying means.

[0002]

2. Description of the Related Art Conventionally, raw garbage discharged from cities has been separated into exhaust gas and solids after metal components are separated and dried by flash drying means, and then used as garbage solidified fuel. FIG. 4 shows an outline of a drying step in solidifying the dust.

The garbage discharged from the city is separated into iron and aluminum by a magnetic separation device and an aluminum separation device (not shown). Then, as shown in FIG. The garbage is supplied, and after being cut, the garbage is supplied to the vertical flash drying unit 04 by the garbage quantitative supply unit 03. The flash drying means 0
4 is about 2 which is sent from the lower end by the hot air generating furnace 05.
The hot air of about 00 ° C. is introduced, and the garbage supplied by the hot air is sent to the cyclone 06, while the garbage falling in the flash drying means 04 is treated as incombustible by the incombustible material collecting means 07 separately. Have been. In the cyclone 06, the exhaust gas is separated into solids and the exhaust gas is sent to the hot air generating furnace 05 by the hot air circulation blower 08, and a part of the exhaust gas is discharged to the outside via the wet deodorizing means 09. Solids discharged from cyclone 06 include:
After the lime is supplied by the lime supply means 010, it is used as refuse solidified fuel (RDF).

[0004]

However, in the conventional garbage solidifying means, drying in an air stream requires a large-sized dryer due to poor drying efficiency, resulting in a high running cost. ing.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a refuse drying method and apparatus for improving the drying efficiency of garbage discharged from cities and reducing the size of a flash drying means.

[0006]

Means for Solving the Problems According to the invention of claim 1 of the present invention which solves the above-mentioned problems, the garbage is flash-dried by hot air supplied from a hot-air generating means by a flash drying means and the flash drying is performed. In the garbage drying method, in which the garbage dried after being dried on the downstream side of the means is separated into solid and gas, the warm air after the solid and gas separation is supplied to the airflow drying means to supply the garbage to the supply system, and the raw material supplied by the heat is supplied. The garbage is pre-dried.

According to a second aspect of the present invention, the garbage is supplied to the flash drying means via the trash supply means, and the garbage is flash dried by the hot air supplied from the hot air generating means. In the refuse drying method in which the refuse dried on the downstream side of the drying means is separated by solid-gas separation and taken out, the heat recovery path for introducing the garbage into the supply system with the hot air after the solid-gas separation is provided in the flash drying means. It is characterized by.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the refuse drying method and apparatus of the present invention will be described, but the present invention is not limited thereto.

In the method and apparatus for drying garbage according to the present invention, the exhaust gas from the cyclone is introduced into a hopper to give residual heat in advance, and the sensible heat In this way, the garbage is dried to reduce the size of the airflow drying means and to reduce the running cost of the plant.

FIG. 1 schematically shows a drying apparatus according to the present embodiment. As shown in FIG. 1, a garbage transport conveyor 11 for transporting garbage 10 from which iron, aluminum and the like are separated.
And a hopper 12 that pulverizes the conveyed garbage after being thrown in, garbage quantitative supply means 13 for supplying a fixed amount of crushed garbage, and garbage supplied by the garbage quantitative supply means 13 is dried. A vertical flash drying means 14, a hot air generating furnace 15 for supplying hot air (200 ° C.) from the lower end of the flash drying means 14, and the dried garbage is removed by the hot air into exhaust gas and solids. A hot air circulating blower 17 for feeding exhaust gas discharged from the cyclone to the hot air generating furnace 15, and a hot air 19 a of the exhaust gas through a hot air supply blower 18. And a heat recovery path 19 for feeding into the hopper 12. The reference numeral 15a in the drawing indicates a feed blower. The solids discharged from the cyclone 16 are supplied with lime by the lime supply means 20 as in the related art,
Solid waste fuel (RDF). What has fallen in the flash drying means 14 is separately treated as incombustible material by incombustible material collecting means 21.

The garbage dried by the flash drying means is separated into solid and gas by the cyclone 16 while being accompanied by the air flow. A part of the separated exhaust gas is introduced into the hopper 12 as hot air (about 150 ° C.) 19 a by the heat recovery path 19, and a part of the garbage is dried in the hopper 12, and moisture in the flash drying means is removed. The amount of drying is reduced. Exhaust gas from the hopper 12 is discharged to the outside via the wet deodorizing device 22. In FIG. 1, warm air 19
Although a is introduced from the lower part of the hopper main body, any form may be used as long as the raw garbage 10 is preheated by using the exhaust heat, and there is no particular limitation.

FIG. 2 shows another embodiment, in which hot air 19a introduced from the vicinity of the lower part of the hopper 12 through the heat recovery path 19 preheats the garbage 10, and the preheated garbage 10 is transferred to the hopper. From the upper opening 12a of the main body, the screw is gradually dropped onto the screw 12b.

[0013] The sensible heat of the drying gas, which was conventionally discarded as waste heat, is sent to the hopper 12 to perform pre-drying by utilizing the sensible heat, thereby reducing the load on the flash dryer and consequently reducing the load on the flash drying means. Compactness can be achieved. Conventionally, garbage (water 40 to 6) introduced into the hopper 12
(0%) is room temperature, which was dried only in the flash drying means 14 and introduced into the cyclone. However, according to the present invention, the water content was greatly reduced before the cyclone was introduced. The size of the drying means can be reduced.

<Embodiment> In order to simulate the apparatus configuration shown in FIG.
Trial calculations were performed with 45% and 41%. As shown in FIG. 3, if the water content at the time of introduction was low, the water content after the cyclone recovery was low, and good drying was possible. The numbers on the horizontal axis in FIG. 3 correspond to the respective drying parts shown in FIG. In FIG. 3, the first pass and the second pass are defined as the first pass when the system is passed once and the second pass when the system is passed.

[0015]

As described above, according to the drying method of the present invention, the garbage is flash-dried by the hot air supplied from the hot-air generating means by the flash drying means, and the garbage is dried downstream of the flash drying means. In the garbage drying method of removing the garbage by solid-gas separation, the warm air after the solid-gas separation is fed to the flash drying means to feed the garbage to the supply system, and the garbage supplied by the heat is preliminarily dried. The drying efficiency of the garbage discharged from the garbage can be improved, and the flash drying means can be made compact.

Further, in the refuse drying apparatus of the present invention, the garbage is supplied to the flash drying means via the trash supply means, and the refuse is dried by the hot air supplied from the hot air generating means. In a refuse drying method in which garbage dried on the downstream side of the flash drying means is separated by solid-gas separation and taken out, a heat recovery path is provided in which the hot air after the solid-gas separation is supplied to the flash drying means to supply garbage to a supply system. Therefore, since the garbage supplied by the heat is pre-dried, the drying efficiency of the garbage discharged from the city can be improved, and the flash drying means can be made compact.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a refuse drying system of the present invention.

FIG. 2 is a schematic diagram of a hopper according to the embodiment.

FIG. 3 is a graph showing the test results.

FIG. 4 is a schematic view of a conventional refuse drying apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 garbage 11 garbage transport conveyor 12 hopper 13 garbage quantitative supply means 14 airflow drying means 15 hot air generator 16 cyclone 17 hot air circulation blower 18 hot air supply blower 19 heat recovery path 19a hot air 20 lime supply means 21 incombustibles recovery Means 22 Wet deodorizer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yama ▲ Saki ▼ Ayumu Nishikicho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd. Yokohama Works

Claims (2)

[Claims] 1. A dust drying method in which garbage is flash-dried by hot air supplied from a hot-air generating means by a flash drying means, and the dried trash is separated by solid-gas separation at a downstream side of the flash drying means. A garbage drying method, characterized in that garbage is introduced into the supply system with the hot air after gas separation into the flash drying means, and the garbage supplied by the heat is pre-dried. 2. The garbage is supplied to the flash drying means via the trash supply means, and is dried by the hot air supplied from the hot air generating means by the flash drying means, and is dried downstream of the flash drying means. A refuse drying method for removing the separated refuse by solid-gas separation, wherein a heat recovery path is provided for supplying the garbage to the supply system with the hot air after the solid-gas separation in the flash drying means. .