JP4073380B2 - Moisture removal device - Google Patents

Description

The present invention relates to a moisture removing apparatus for removing moisture from earth and sand having a high moisture content and reducing the moisture content.

The muddy water-like earth and sand generated at the construction site and the earth and sand dredged from the bottom of the lake are treated as industrial waste with a water content ratio exceeding 100%. However, the earth and sand that originally constituted the ground can be reused by, for example, refilling it by removing water to some extent.
On the other hand, conventionally, as a method of drying earth and sand to adjust the moisture content of the embankment, a method of adjusting the moisture content by blowing hot air on the surface of the earth and sand to evaporate moisture from the outside, or a cement-based improving material or lime, etc. A method of reducing the water content ratio by chemical reaction, etc. has been implemented.

The conventional methods for drying earth and sand have the following problems.
<1> In the method of forcibly drying with hot air, the inside cannot be sufficiently dried unless hot air is blown for a long time. For this reason, it takes a long time to dry, and in order to increase the processing capacity, it is necessary to use a large-scale apparatus and burn a large amount of fuel. As a result, the cost for drying is increased, and combustion products such as nitrogen oxides are generated during the combustion operation, which may contaminate the atmosphere.
<2> In the method of mixing cement-based improving materials and lime, it is necessary to give sufficient consideration to the safety of chemical substances and the like during mixing work. In addition, when earth and sand mixed with chemical substances are used for embankment or landfill, there is a risk of adverse effects on the surrounding environment.

In order to solve the above-described problems, the moisture removing device of the present invention is a moisture removing device that removes moisture from earth and sand having a high water content ratio, and includes a conveyor that continuously conveys the earth and sand, A shield container having an opening for projecting the front end and the rear end, a magnetron for generating a microwave, a waveguide for transmitting the microwave generated from the magnetron, and the progress of the conveyor within the shield container A plurality of irradiation openings provided at intervals in the direction, an exhaust device for exhausting moist air in the shield container, and a front end of the conveyor protruding from the shield container, with a predetermined distance from the upper surface of the conveyor consists of a thickness adjusting plate disposed in a position opened, was also characterized by adjusting the thickness of less than the predetermined thickness of the sediment to be transported by the conveyor It is. Here, the earth and sand having a high water content ratio refers to earth and sand that needs to be removed, and moisture removal objects such as sludge corresponding to the earth and sand.
Moreover, the shape of the said irradiation port can also be made into the shape which spreads toward the downward direction.

The moisture removing apparatus of the present invention can obtain at least one of the following effects by means for solving the above-described problems.
<1> By using microwaves, the moisture of earth and sand can be efficiently removed. In particular, by adjusting the thickness of the earth and sand so that moisture can be effectively removed, the moisture of the earth and sand can be uniformly removed.
<2> Sediment can be continuously conveyed by a conveyor, and moisture in the sediment can be removed continuously. For this reason, even if it does not use a large-scale installation, the water | moisture content of earth and sand can be removed economically.
<3> Since a large amount of fuel is not burned, the atmosphere is not polluted with combustion gas. Further, the evaporated water can be collected through the exhaust device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1> Microwave Generator A microwave generator includes a magnetron 11 that generates a microwave 1, a waveguide 12 that transmits the microwave 1 generated from the magnetron 11, and an irradiation port 13 that irradiates the microwave 1. , And other known devices for supplying the microwave 1.
The microwave 1 generated from the magnetron 11 is transmitted by the waveguide 12. However, by branching the waveguide 12 in the middle, the flow of the microwave 1 generated from one magnetron 11 is changed into a plurality of It can be divided into microwave 1 flows. An irradiation port 13 is provided at the tip of the branched waveguide 12 so that the microwave 1 can be irradiated to the earth and sand 3 at a plurality of locations. That is, in the present invention, the moisture of the earth and sand 3 is gradually removed while being conveyed by the conveyor 2, and therefore, it is necessary to provide a plurality of irradiation ports 13 of the microwave 1 at intervals in the traveling direction of the conveyor 2. There is.
It is preferable that the microwave 1 irradiated from the irradiation port 13 is widely dispersed within a range where the heating effect is not reduced, and is irradiated to a wide range of the earth and sand 3 carried by the conveyor 2. For this reason, it is preferable that the shape of the irradiation port 13 be a shape that widens toward the bottom. Although the angle which spreads downward can be set arbitrarily, it is preferable to set the installation interval and the angle of spread of the irradiation port 13 so that the irradiated microwave 1 is evenly irradiated to the earth and sand 3. .

<2> Shield container The range irradiated with the microwave 1 needs to be surrounded by the shield container 5 so that the irradiated microwave 1 does not leak. On the other hand, when removing moisture while transporting the earth and sand 3 using the conveyor 2 such as a belt conveyor, the front end portion where the earth and sand 3 is loaded on the conveyor 2 and the earth and sand 3 from which moisture has been removed in the shield container 5 are discharged. The rear end portion needs to protrude from the shield container 5. For this reason, the shield container 5 is formed in a tunnel shape by providing two openings 51 on the front and rear sides.
On the other hand, the opening 51 causes the microwave 1 to leak to the outside. Therefore, in order to prevent leakage of the microwave 1, for example, a leakage prevention unit 52 that absorbs the microwave 1 is provided around the opening 51. As a member that absorbs the microwave 1, a material that is mainly made of ferrite, carbon powder, iron oxide, or the like and is kneaded with cement or plastic can be used.

<3> Conveyor The conveyor 2 that passes through the shield container 5 is made of a material that does not easily deteriorate even when the microwave 1 is irradiated. For example, a known material such as a belt made of glass fiber as a core and coated with tetrafluoroethylene or silicon rubber can be used.
Moreover, the conveyance speed of the conveyor 2 can be adjusted with the distance through which the earth and sand 3 pass the shield container 5, the desired moisture removal amount, etc.

<4> Thickness adjusting plate The thickness adjusting plate 6 is disposed so that the thickness of the earth and sand 3 conveyed on the conveyor 2 does not become thicker than a predetermined thickness. For example, it is preferable to adjust the thickness of the earth and sand 3 to about 30 to 50 mm.
For example, the thickness adjusting plate 6 is attached to the outside of the opening 51 serving as the entrance of the shield container 5 at a predetermined distance from the upper surface of the conveyor 2. The earth and sand 3 are configured to pass through the gap. With this configuration, the earth and sand 3 exceeding the predetermined thickness is cut, and only the earth and sand 5 that has penetrated the lower end of the thickness adjusting plate 6 is supplied into the shield container 5. The thickness of the earth and sand 5 can be arbitrarily adjusted while comparing the water content ratio of the supplied earth and sand 3, the water content ratio of the earth and sand 3 discharged after removing moisture, and the target water content ratio. For example, if the thickness adjusting plate 6 is configured to be variable up and down, the thickness of the earth and sand 3 entering the shield container 5 can be changed. However, considering the effective thickness of the microwave 1, the thickness of the earth and sand 3 is preferably 50 mm or less. Moreover, in order to perform thickness adjustment reliably, the thickness adjusting plate 6 can also be arrange | positioned at intervals in the advancing direction of the conveyor 2 (refer FIG. 1).
Further, the thickness adjusting plate 6 can be provided inside the shield container 5. For example, if it is set as the structure which passes the thickness adjustment board 6 before the earth and sand 3 arrives at the irradiation port 13, it can be set as the thickness which can remove a water | moisture content efficiently.

<5> Exhaust device When the inside of the shield container 5 is filled with moist air evaporated from the earth and sand 3, the efficiency of removing moisture decreases. For this reason, an exhaust device for exhausting the moist air in the shield container 5 is provided.
The exhaust device includes, for example, an exhaust pipe 41 disposed in the shield container 5 and a water storage tank 43 that stores air and water discharged from the exhaust pipe 41. It is preferable that a plurality of suction ports of the exhaust pipe 41 are arranged in the shield container 5. Evaporated water vapor will be filled in the shield container 5, so it is more efficient to inhale moist air than to be configured to exhaust at a single location and to have a plurality of locations with suction ports. Is. Further, a fan 42 is attached to the inside of the exhaust pipe 41 so as to send out moist air toward the water storage tank 43. The moist air is cooled while being transported inside the exhaust pipe 41 or in the water storage tank 43 to generate water.

A method for removing moisture from the earth and sand 3 by the moisture removing apparatus of the present invention will be described with reference to the drawings.
First, the earth and sand 3 having a high water content ratio that needs to remove moisture is carried into the hopper 22 by the belt conveyor 21 or the like. The earth and sand 3 having a high water content refers to earth and sand that needs to be removed in addition to muddy water-like earth and sand generated at a construction site, dredged from the bottom of a lake, and the like. Moreover, the sludge-like thing which needs to remove a water | moisture content is also contained in the earth and sand of this invention. For example, the moisture content of earth and sand 3 generated from construction sites as industrial waste exceeds 100%. The earth and sand 3 thrown into the hopper 22 is discharged from the lower opening of the hopper 22 to the front end of the conveyor 2.
The earth and sand 3 piled up at the front end of the conveyor 2 is sent toward the shield container 5 by the operation of the conveyor 2. And it is shape | molded by the thickness adjustment board 6 to the thickness of about 30-50 mm, for example, and it sends out in the shield container 5. FIG. In the shield container 5, the microwave 1 is supplied by using two magnetrons 11 each having an output of about 30 kW. The length of the conveyor 2 that passes through the shield container 5 is, for example, about 20 to 25 m, and the width is about 1 m. When the microwaves 1 are evenly irradiated to the earth and sand 3 from the irradiation ports 13 arranged at about eight positions at intervals in the traveling direction of the conveyor 2, moisture is gradually removed from the earth and sand 3 exposed to the microwaves 1 and the shield. Steam stays in the container 5. For this reason, moist air is sucked from the suction ports arranged at about five positions with intervals in the traveling direction of the conveyor 2 and is exhausted by the exhaust pipe 41.
The earth and sand 3 discharged from the opening 51 of the shield container 5 is sent to a predetermined place by the belt conveyor 23 for carrying out. Here, for example, if the water content of the earth and sand 3 after removing moisture is reduced to about 40%, it can be used as a raw material for fluidized soil, backfill soil, or the like. That is, even if the water content of the earth and sand 3 is not completely removed, the water content ratio of the earth and sand 3 that had a high water content ratio is reduced, so that what has to be treated as waste can be recycled as a high-quality construction material. Can be used.

Explanatory drawing of the Example of the water | moisture-content removal apparatus of this invention. A sectional view of FIG. B sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Microwave 11 ... Magnetron 12 ... Waveguide 13 ... Irradiation port 2 ... Conveyor 3 ... Earth and sand 41 ... Exhaust pipe 5 ... Shield container 51 ... Opening 52 ... Leakage prevention part 6 ... Thickness adjustment plate

Claims (2)

A moisture removal device for removing moisture from earth and sand having a high water content,
A conveyor for continuously conveying the earth and sand;
A shield container having an opening for projecting the front and rear ends of the conveyor;
A magnetron that generates microwaves,
A waveguide for transmitting microwaves generated from the magnetron;
A plurality of irradiation ports provided at intervals in the traveling direction of the conveyor inside the shield container,
An exhaust device for exhausting moist air in the shield container;
It is the front end of the conveyor protruding from the shield container, and comprises a thickness adjusting plate arranged at a position spaced from the upper surface of the conveyor by a predetermined interval,
The thickness of the earth and sand conveyed by the conveyor is adjusted to a predetermined thickness or less,
Moisture removal device. The water removal apparatus according to claim 1 ,
A moisture removing apparatus characterized in that the shape of the irradiation port is a shape that expands downward toward the bottom.

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