JP2008290045A - Quantitative feeder, apparatus for preparing slurry and method for preventing adhesion of powder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent limestone from absorbing moisture and the moisture-absorbed limestone from sticking to the inside of a quantitative feeder of limestone. <P>SOLUTION: The quantitative feeder 11 is provided with an air supply means 29 for sending dried air so that the dried air flows from the inside of the quantitative feeder toward the outside through a chute 28 through which limestone is discharged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a slurry production apparatus that produces limestone slurry by mixing limestone and water, and a quantitative supply device that quantitatively supplies limestone to the slurry production apparatus.

Conventionally, desulfurization devices have been provided in power plants to remove sulfides contained in exhaust gas. In this desulfurization apparatus, desulfurization is performed by bringing a limestone slurry containing limestone into contact with exhaust gas (see, for example, Patent Document 1). Limestone slurry is produced by quantitatively supplying limestone to a slurry production device from a discharge port of a powder quantitative supply device called a feeder, and mixing the supplied limestone and water in the slurry production device.
JP 2001-190928 A

  Thus, since water is used for the production of limestone slurry, moisture from the water enters the quantitative supply device from the discharge port side of the quantitative supply device, and limestone adheres to the vicinity of the discharge port of the quantitative supply device. In other words, it may cause clogging. In such a case, there is a problem that the apparatus must be stopped and the inside of the apparatus must be cleaned.

  The present invention has been made in view of the above problems, and its purpose is to prevent limestone from absorbing moisture and adhering to the apparatus in a device that quantitatively supplies limestone to produce limestone slurry. It is to be.

  The quantitative supply device of the present invention is a quantitative supply device that quantitatively supplies hygroscopic powder, and is dried so that the powder flows from the inside of the device to the outside through the discharge port from which the powder is discharged. An air supply means for feeding air is provided.

Further, the quantitative supply device of the present invention includes a cylindrical powder container into which hygroscopic powder is charged from above and a discharge port at the bottom, and a plurality of partition plates attached to the upper surface. Each of the spaces formed by the partition plate adjacent to the turntable and the inner wall of the powder container. The powder supply device sequentially discharges the powder stored in each space from the discharge port by rotating the turntable, and passes through the discharge port from the inside of the powder container. An air supply means for sending dry air so as to flow toward the outside is provided.
In the above quantitative supply apparatus, the powder may be limestone.

  Moreover, the slurry manufacturing apparatus of this invention is equipped with said quantitative supply apparatus and the water supply apparatus which supplies water to the limestone supplied by the said quantitative supply apparatus, It is characterized by the above-mentioned.

  Also, the powder adhesion preventing method in the quantitative supply device of the present invention comprises a cylindrical powder container in which hygroscopic powder is charged from above and a discharge port at the bottom, and a plurality of partition plates attached to the upper surface. A turntable rotatably disposed on the lower surface of the powder container, and the powder charged in the powder container is adjacent to the partition plate of the turntable and the inner wall of the powder container In the quantitative supply apparatus that sequentially discharges the powder stored in each space from the discharge port by rotating the turntable, the powder is adsorbed inside the apparatus. The dry air is sent out from the inside of the powder container so as to flow toward the outside through the discharge port.

  According to the present invention, since dry air is sent out through the discharge port to the outside, it is possible to prevent the wet external air from flowing into the apparatus and to dry the wet powder inside the apparatus. be able to. Thereby, it can prevent that powder adheres to the inside of an apparatus.

Hereinafter, an embodiment of a quantitative supply device for limestone according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a slurry production apparatus 1 in which a limestone quantitative supply apparatus 11 according to this embodiment is incorporated. As shown in the figure, the slurry production apparatus 1 includes a silo body 10, a quantitative supply device 11 provided below the silo body 10, an air slide conveyor 12 that carries limestone discharged from the quantitative supply device 11, A water supply device 13 for supplying water, a bag filter 15, and a limestone slurry tank 14 for producing limestone slurry are provided.

The silo body 10 is a container for storing limestone, and limestone is introduced from an inlet provided above. Then, the silo body 10 temporarily stores the limestone input from this input port, and inputs it to the quantitative supply device 11 from the lower discharge port.
The quantitative supply device 11 quantitatively discharges the limestone input from the silo body 10 to the air slide conveyor 12.

Limestone discharged from the quantitative supply device 11 is carried by the air slide conveyor 12 and supplied to the limestone slurry tank 14.
The water supply device 13 supplies water to the limestone slurry tank 14 in accordance with the amount of limestone supplied from the quantitative supply device 11.
The limestone slurry tank 14 produces and stores a limestone slurry by mixing the supplied limestone and water.
The bag filter 15 collects the scattered limestone dust and cleans the air.

2A and 2B show a configuration of the quantitative supply device 11 of the present embodiment, where FIG. 2A is a vertical sectional view and FIG. 2B is a sectional view taken along line AA ′ in FIG. As shown in the figure, the quantitative supply device 11 includes an upper cylindrical portion 20, a lower cylindrical portion 21, a turntable 22, a chute 28, a shaft member 25, an upper stirring body 23, and a lower stirring body 24. , An impeller 27, a grinding plate 26, and an air supply unit 29. Limestone is introduced from the silo body 10 into the upper cylindrical portion 20.
As shown in FIG. 2 (A), the upper cylindrical portion 20 and the lower cylindrical portion 21 are cylindrical members having different diameters connected in the vertical direction so that the central axes coincide with each other. The cylinder portion 21 communicates with an opening 31 provided on the joint surface.

The shaft member 25 is provided at the center of the upper cylindrical portion 20 and the lower cylindrical portion 21 so that the upper end reaches the upper cylindrical portion 20 and is driven to rotate by a drive mechanism (not shown). A turntable 22, an upper stirring body 23, and a lower stirring body 24 are attached to the shaft member 25, and the turntable 22, the upper stirring body 23, and the lower stirring body 24 are driven by rotating the shaft member 25. Rotates.
A cylindrical threshold plate 33 and a plurality of impellers 27 are attached to the turntable 22 at equal intervals radially around the threshold plate 33. The front end surface of the impeller 27 is opposed to the inner surface of the lower cylindrical portion 21 with a slight clearance, whereby a plurality of spaces 32 are formed by the threshold plate 33, the adjacent impeller 27 and the inner surface of the lower cylindrical portion 21. Has been.

The upper stirring body 23 is attached to a position corresponding to the upper cylindrical portion 20 of the shaft member 25, and the limestone in the upper cylindrical portion 20 is stirred by the rotation of the shaft member 25. As a result, the limestone in the upper cylindrical portion 20 is loosened and dropped into the lower cylindrical portion 21 from the opening 31.
The lower stirring body 24 is attached at a position where it does not interfere with the cover member 30 provided above the chute 28 of the shaft member 25, and the limestone in the lower cylindrical portion 21 is stirred by the rotation of the shaft member 25. Limestone in the cylindrical portion 21 is dropped into a space defined by the adjacent threshold plate 33, the adjacent impeller 27, and the inner surface of the lower cylindrical portion 21.

The ground plate 26 is attached so as to extend from the side surface of the lower cylindrical portion 21 toward the center so that the lower portion thereof has a height substantially equal to the upper surface of the impeller 27 of the turntable 22. By passing the limestone into the space between the impellers 27 and passing below the grinding plate 26, the limestone above the lower surface height of the grinding plate 26 is removed, and the amount of limestone between the impellers 27 is substantially reduced. Will be equal.
The air supply unit 29 is provided outside the apparatus and supplies dry air into the lower inner cylinder portion 21 from above the chute 28. A cover member 30 is attached above the chute 28, and the direction of wind of the dry air supplied from the air supply unit 29 is changed by the cover member 30, and passes through the chute 28 to the outside as indicated by arrows in the figure. It flows out.
Thus, since dry air blows in from the air supply part 29 through the chute | shoot 28 toward the exterior, it can prevent that the air containing external moisture flows into the inside of an apparatus. At the same time, when the limestone passes through the chute, the limestone can be dried by applying dry air to the limestone.

Hereinafter, the process which manufactures a limestone slurry with the slurry manufacturing apparatus 1 is demonstrated.
First, the limestone charged into the silo body 10 is charged into the upper cylindrical portion 20 of the quantitative supply device 11 from the discharge port below the silo body 10.
The limestone charged into the upper cylindrical part 20 is loosened by the upper stirring body 23 and charged into the lower cylindrical part 21.

  The limestone charged into the lower cylindrical portion 21 is accommodated in a space formed by the impeller 27 and the inner surface of the lower cylindrical portion 21 as the lower stirring body 24 rotates. Then, when the turntable 22 rotates and passes below the grinding plate 26, the limestone overflowing above the space formed by the impeller 27 is removed. Thereby, the amount of limestone remaining in each space divided by the impeller 27 becomes substantially equal.

Next, the limestone transported to the vicinity of the chute 28 by the rotation of the turntable 22 passes through the chute 28 by the air supply unit 29, passes through the chute 28, and is discharged to the air slide conveyor 12. The
Thus, since dry air blows in from the air supply part 29 through the chute | shoot 28 toward the exterior, it can prevent that the air containing external moisture flows into the inside of an apparatus. Moreover, since limestone dries when it hits with dry air, it can prevent adhering in the fixed amount supply apparatus 11.

  Limestone discharged from the quantitative supply device 11 is supplied to the limestone slurry tank 14 by the air slide conveyor 12. And water is supplied with the water supply apparatus 13, and a limestone slurry can be manufactured by mixing water and limestone.

  According to the quantitative supply device 11 of the present embodiment, since dry air is sent to the chute 28 in the discharge direction by the air supply unit 29, moisture can be prevented from flowing into the chute 28 from the inside, and the limestone is dried. be able to. Thereby, it is possible to prevent limestone from containing moisture and adhering to the inside of the apparatus, that is, causing clogging.

  In this embodiment, in order to produce a limestone slurry, the case where limestone is quantitatively supplied has been described as an example. However, the present invention is not limited thereto, and moisture is supplied from a chute when quantitatively supplying powder by a quantitative supply device. If the contained air flows in and there is a possibility that the powder absorbs moisture and adheres to the apparatus, the quantitative supply apparatus of the present invention can be used.

It is a figure which shows the structure of the slurry manufacturing apparatus with which the fixed supply apparatus of the limestone of this embodiment was integrated. The structure of the fixed_quantity | feed_rate supply apparatus of this embodiment is shown, (A) is vertical direction sectional drawing, (B) is AA 'sectional drawing in (A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Slurry manufacturing apparatus 10 Silo main body 11 Fixed supply apparatus 12 Air slide conveyor 13 Water supply apparatus 14 Slurry tank 15 Bag filter 20 Upper cylindrical part 21 Lower cylindrical part 22 Turntable 23 Upper stirring body 24 Lower stirring body 25 Shaft member 26 Grinding plate 27 Impeller 28 Chute 29 Air supply part 30 Cover member 31 Opening part 32 Space 33 Threshold plate

Claims (5)

A quantitative supply device for quantitatively discharging hygroscopic powder from an outlet,
A quantitative supply device comprising air supply means for sending dry air so as to flow from the inside of the quantitative supply device to the outside through the discharge port. A cylindrical powder container in which hygroscopic powder is introduced from above and a discharge port is provided below,
A plurality of partition plates are attached to the upper surface, and a turntable rotatably installed on the lower surface of the powder container,
The powder charged in the powder container is accommodated in each space formed by the partition plate adjacent to the turntable and the inner wall of the powder container, and the turntable rotates to thereby each of the spaces. A quantitative supply device that sequentially discharges the powder contained in the discharge port,
A quantitative supply device comprising air supply means for sending dry air so as to flow from the inside of the powder container to the outside through the discharge port.   The quantitative supply device according to claim 1, wherein the powder is limestone. A quantitative supply device according to claim 3;
A water supply device for supplying water to the limestone supplied by the quantitative supply device;
A slurry production apparatus comprising: A turn in which hygroscopic powder is introduced from above, a cylindrical powder container having a discharge port below, and a plurality of partition plates attached to the upper surface, and rotatably installed on the lower surface of the powder container A powder, and the powder charged in the powder container is accommodated in each space formed by the partition plate adjacent to the turntable and the inner wall of the powder container, and the turntable rotates. In the quantitative supply device that sequentially discharges the powder stored in each space from the discharge port, the powder is prevented from adsorbing inside the device,
A method for preventing powder adhesion in a quantitative supply device, characterized in that dry air is sent out from the inside of the powder container so as to flow outward through the discharge port.