JPS6054589B2 - Method for drying high water content sludge or high water content dust - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for dewatering and drying high water content sludge or high water content dust.

Conventionally, high water content sludge or high water content dust (hereinafter referred to as
It is called dried material.

), a combination of various dehydration and filtration methods and a natural drying method for the entire drying chamber were used. The problem with all of these methods was that the equipment and maintenance costs were too high. In contrast, the earlier Japanese Patent Application Publication No. 53-7
891 Sae proposes a drying method using a stirring blade as a combination means with the solar drying method, and further using equipment provided with an auxiliary heating zone on the floor of the drying chamber. However, even with this improvement plan, heat dissipation loss from the bottom surface of the heating panel cannot be avoided, and due to variations in the manufacturing accuracy of the stirring blade or deformation of the stirring blade, a layer of the material to be dried that is not stirred remains on the heating panel. The disadvantage is that the thermal efficiency of the drying equipment is low because of the Solving the above problems and drawbacks of the present invention,
The present invention provides a drying method for dehydrating, drying, and reusing dried materials, or for easily performing post-processing.

That is, in order to effectively utilize solar drying, the material to be dried is spread out to an appropriate uniform thickness on the floor of a room equipped with lighting and moisture drainage functions, and is dehydrated while being stirred with a stirring blade. In contrast to known means of drying, the feature of the present invention is that the heat supplied for dehydration and drying is most efficiently used by blowing hot air toward the material to be dried which is being stirred by a stirring blade. It's there for you to use. The apparatus used in the method of the present invention will be explained below using illustrated examples.
Figure 1 is a schematic plan view of the dehydration and drying chamber, Figure 2 is a schematic plan view of the stirring and conveying machine equipped with a hot air generator, Figure 3 is a schematic sectional view of the stirring and conveying machine, and Figure 4 is a schematic plan view of the stirring and conveying machine equipped with a hot air generator. The figure is a sectional view taken along the line AA in FIG. 3.

1 is a dehydration and drying room made of lightweight steel, and its ceiling and walls are 2
Covered with a sun-permeable vinyl membrane.

3 is the rail, 4 is the trolley of the stirring and conveying machine, 5 is its wheels, 6 is the gear fixed to the same axis of the wheel 5, 7 is the conveyance drive source, 8 is the chain and the output of the conveyance drive source 7'' Gear 6
The information is transmitted to the wheels 5 via the agitation/conveyor trolley 4.
be transported.

Further, reference numeral 9 denotes a horizontal stirring shaft, 10 a support column for the horizontal stirring shaft 9 which is vertically installed from the cart 4, and 11 a stirring horizontal shaft 9 which is disposed at an appropriate position on the horizontal stirring shaft 9 and fixed to the horizontal stirring shaft 9. The blades 12 and 13 are a stirring drive source for rotating the horizontal stirring shaft 9, and 13 is a chain that transmits the output of the stirring driving source 12 to the horizontal stirring shaft 9 and rotates it, thereby rotating the horizontal stirring shaft 9. The stirring blades 11 fixed to are rotated. 14 indicates the floor of the dehydration and drying room.

Reference numeral 15 denotes a material to be dried, which is stirred by a stirring blade 11 .

On the other hand, 16 is a hot air generator mounted on the trolley 4. As a heat source for the hot air generator, it is preferable that the hot air generator be integrated with the trolley 4, such as by providing an electric heater in conjunction with a stove using liquid or other fuel, or a driving source for agitation and transportation. A duct 17 is connected to the hot air generator 16 and is mounted on the truck 4.

Reference numeral 18 indicates a hot air outlet which is disposed at an appropriate position in the duct 17 and is capable of blowing uniform and high-velocity hot air toward the portion of the material to be dried 15 that is being stirred; This shows an airtight hood with a heat insulating structure that prevents the residual heat of hot air blown at high speed from radiating directly into the dehydration and drying chamber 1.

Furthermore, limit switches are installed at both ends of the rail 3.
Furthermore, a timer is attached to the transport drive source 7 and the stirring drive source 12, so that the transport speed and the stirring speed can be arbitrarily set. After setting the speed, when both of the driving sources 7 and 12 are activated, the material moves back and forth through the dewatering and drying chamber 1 while stirring and conveying at a constant speed. In addition to the above-described case, the present invention also allows the apparatus to fix the position of the stirring blade 11 and move the floor surface 14. The most effective point of dehydration and drying using the above-mentioned apparatus is the means for supplying an artificial heat source.

That is, as shown in FIG. 4, the relative positions of the grains of the dried material 15'' being stirred by the stirring blade 11 are dynamically disrupted, and during this time the moisture contained in them is released into the surrounding atmosphere. Taking advantage of this opportunity, hot air is blown toward the material to be dried 15'' while it is being stirred. In this case, it is easy to understand that the faster the hot air blows, the higher the heat transfer coefficient to the material to be dried 15, and the higher the hot air temperature, the larger the amount of heat transfer. On the other hand, the residual heat from the blown hot air stays in the airtight hood 19 with a heat insulating structure and raises the ambient temperature, and heat transfer to the material to be dried 15 around the agitation area is achieved, further increasing the thermal efficiency. be enhanced. As an example of the present invention, the present invention is based on a device in which rails are installed in a dewatering and drying chamber made of a plastic greenhouse with a fixed floor surface, and a trolley for stirring and conveying is arranged so that it can move on its own. The hot air generator, which is part of the invention, uses a method of burning white kerosene.

The combustion gas thus obtained was introduced into the duct and blown from the hot air outlet at a wind speed of about 15 m/s from in front of the stirring blade toward the water-containing sludge being stirred. A glass fiber curtain was placed around the cart holding the stirring blades to form an airtight hood. By implementing the auxiliary heating method of the present invention, it has become possible to obtain high thermal efficiency and to perform extremely economical drying.

The present invention is applicable not only to the dehydration and drying of high water content sludge or high water content dust, but also to the dewatering and drying of various materials such as sand, clay, earth and sand, and ores.

[Brief explanation of drawings]

The drawing schematically shows one embodiment of the present invention.
The figure is a schematic plan view of the dehydration and drying chamber, Figure 2 is a schematic plan view of the stirring and conveying machine equipped with a hot air generator, Figure 3 is a front sectional view of the stirring and conveying machine, and Figure 4 is a schematic plan view of the stirring and conveying machine equipped with a hot air generator. A-A in Figure 3
FIG. 1...Dehydration, drying room, 2...vinyl membrane, 3...rules, 4...stirring, trolley of conveyor, 5... ... Wheels, 6 ... Gears, 7 ... Conveyance drive source, 8 ... Chain, 9 ... Stirring horizontal shaft, 10 ... ... Support column, 11 ... Stirring blade, 12 ... Stirring drive source, 13 ... Chain, 14 ... Dehydration and drying room floor, 15... Material to be dried, 15''
...Dried material being stirred, 16...Hot air generator, 17...Duct, 18...Hot air outlet, 19...Sealing of heat insulating structure Hood.

Claims (1)

[Claims] 1. When drying the material to be dried in a layered manner in a room through which sunlight can pass, and stirring the material with a stirring blade,
A method for drying high water content sludge or high water content dust, characterized by blowing hot air toward the material to be dried while stirring.