JP2665309B2 - Powder humidifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder humidifier used for humidifying incineration ash of a fluidized incinerator or the like.

[0002]

2. Description of the Related Art When powder such as incineration ash obtained by incinerating sewage sludge in a fluidized incinerator is loaded on a truck, it is necessary to humidify it in advance to prevent generation of dust. For this reason, a batch type humidifier of the cement mixer type was conventionally used, but there is a waste time due to the batch type, and a large-scale facility was required to process a large amount of incinerated ash. .

[0003] Therefore, recently, a continuous humidifier has been developed in which two screw shafts for transferring powder into a casing and a sprinkling pipe are arranged. Since this humidifier has a processing capacity three to six times that of a conventional batch humidifier, the equipment capacity and power are both significantly reduced. However, when the particle size of the powder is small, the powder charged into the casing of the humidifier may pass through the upper space without stirring, and may be discharged as dust from the outlet. For this reason, dust is generated when the powder is loaded on the truck, which causes a problem that the working environment is deteriorated and that the cleaning operation requires much time.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and humidifies powder which can surely humidify powder having a small particle size such as incineration ash of a fluidized incinerator. It was made to provide a machine.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a powder humidifier having a screw shaft for transferring powder inside a casing and a water sprinkling pipe. A flexible shielding film having a lower end in contact with the powder is provided in an inner space of the casing between the water sprinkling pipe and the powder outlet.

[0006]

According to the powder humidifier of the present invention, powder is supplied from a powder supply port into a casing provided with a water sprinkling pipe, and is sprayed from the water sprinkling pipe while being transported toward a powder outlet by a screw shaft. The water and the powder are stirred and the humidified powder is discharged from the powder outlet as in the conventional case. However, in the present invention, since a flexible shielding film whose lower end is in contact with the powder is provided in the internal space of the casing between the sprinkler pipe and the powder outlet,
The blocking film surely prevents the powder charged into the casing from passing through the upper space without being stirred, and also prevents dust from leaking from the upper space. For this reason, it is possible to eliminate the possibility that the powder that has not been humidified is discharged from the powder outlet.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the illustrated embodiments. FIG. 1 is a longitudinal sectional view of the embodiment, and FIG. 2 is a plan view. In these figures, 1 is a casing, 2 is a powder supply port formed on the upper surface of one end, and 3 is a powder outlet formed on the lower surface of the other end of the casing 1. Two screw shafts 4, 4 are provided in parallel inside the casing 1, and are rotated in opposite directions by a motor 5. The screw shaft 4 is for transferring the powder supplied from the powder supply port 2 toward the powder outlet 3, and in the embodiment, a short rod 6 projecting in a spiral shape is used. However, a screw shaft having a single blade or a continuous blade can also be used.

[0008] At the center upper portion of the casing 1, several water sprinkling pipes 7 are installed to spray water. Watering pipe 7
In the internal space of the casing 1 between the and the powder outlet 3, a shielding film 8 whose lower end is in contact with the powder is provided. A flexible material such as rubber or cloth is used for the blocking film 8. The width of the shielding film 8 is made equal to the width of the internal space of the casing 1 so as to reliably prevent unhumidified powder from passing through the surface layer.

The incineration ash of the above fluidized incinerator has, for example, an average particle size of about 20 μm, and its particle size distribution is 10% of 5 μm or less, 10% of 5 to 10 μm, 10% of 20 to 20 μm.
%, 45% for 20-44μm, 10% for 44-53μm, 53
It is 10% of those with μm or more. In order to humidify the powder having such a fine particle diameter by the powder humidifier of the embodiment, the powder is introduced into the casing 1 from the powder supply port 2 and the screw shaft 4, The water is sprayed from the sprinkling pipe 7 while being transported toward the powder outlet 3 by 4. At this time, a part of the powder may slide toward the powder outlet 3 without being humidified and kneaded by sliding on the surface layer. Such a powder is blocked by the blocking film 8 whose lower end is in contact with the powder, and the surface of the powder is blocked. Through-passing of the layer is prevented. The blocked powder is kneaded and humidified by the screw shaft 4 and then discharged from the powder outlet 3.

[0010]

As described above, according to the powder humidifier of the present invention, it is possible to reliably prevent the powder that has not been humidified from passing through the surface layer. Such a powder having a small particle diameter can be reliably humidified. Therefore, even when such a powder is loaded on a truck, no dust is generated, so that the working environment can be prevented from deteriorating and the number of cleaning operations can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment.

FIG. 2 is a plan view of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 3 Powder outlet 4 Screw shaft 7 Sprinkler tube 8 Flexible barrier film

Claims (1)

(57) [Claims] 1. A powder humidifier having a screw shaft for transferring powder inside a casing and a water sprinkling pipe, wherein a lower end is provided in an internal space of the casing between the water sprinkling pipe and the powder outlet. A powder humidifier having a flexible barrier film in contact with powder.