JP5380769B2 - Splash prevention watering method - Google Patents

Description

  The present invention relates to a scattering prevention sprinkling method for preventing dust from scattering from iron ore, coal, etc. deposited in a raw material yard provided outdoors in an ironworks, a thermal power plant, a cement factory, etc. is there.

  Normally, in ironworks, etc., iron ore, coal, etc. are deposited and stored (stacked) in a raw material yard provided outdoors. At that time, dust from the deposited iron ore etc. is blown around by the wind. It is necessary to prevent dust pollution caused by scattering.

  As a method of preventing dust from being scattered from the deposited iron ore (sediment), there is a method of solidifying the surface of the pile (sediment mountain) with a chemical. Since it is necessary to spray the medicine every time it is applied, the cost increases if the stacking-dispensing process is repeated in a short period of time.

  Therefore, in general, a method for preventing dust from scattering from being scattered by watering the sedimentary mountain has been taken, and several techniques relating to this have been proposed.

  For example, in Patent Document 1, precipitation and solar energy are measured over time, the moisture content of the surface layer of the deposit is calculated based on the measurement results, and the calculated moisture content is less than the scattering limit value. In this case, a method for preventing scattering is described in which watering is performed.

Patent Document 2 describes a scattering prevention sprinkling method in which a pile is monitored by a television camera, a dust generation state is determined by calculating the obtained image, and water is sprayed based on the determination result. Has been.
Japanese Patent Laid-Open No. 61-243707 JP-A-1-236105

  However, the scattering prevention sprinkling methods described in Patent Documents 1 and 2 have the following problems.

  First, in the scattering prevention sprinkling method described in Patent Document 1, the moisture content of the surface layer portion of the deposit is calculated from the precipitation measured over time, the amount of solar radiation energy, etc., and the necessity of watering is determined. Therefore, it is not easy to accurately calculate the moisture content of the surface layer of sediment from daily precipitation and solar radiation energy, etc., and the calculated moisture content differs from the actual moisture content. There is a possibility that dust will be scattered without watering, or on the contrary, excessive watering may increase the amount of moisture on the surface of the deposit and adversely affect product quality (for example, coke strength). Shortage).

  Further, in the scattering prevention watering method described in Patent Document 2, water spraying is performed when dust is generated, so that it is not completely prevented. In addition, monitoring with a TV camera is difficult at night, and detection of dust generation is difficult.

  The present invention has been made in view of the circumstances as described above, and accurately prevents dust from being scattered from piles (deposition mountains) of deposits such as iron ore and coal deposited outdoors. The object is to provide a method for preventing splashing.

  In order to solve the above problems, the present invention has the following features.

[1] A scattering prevention sprinkling method for preventing dust from splashing from a pile by sprinkling on a pile pile deposited outdoors. The moisture content on the surface of the pile is measured by a moisture meter. If the water content is below the predetermined splash prevention limit water content, water will be sprinkled on the sedimentary mountain, the target water content after watering will be determined in advance, and the watering time and sedimentation separately obtained A scattering prevention sprinkling method characterized by adjusting the watering time so that the target water amount is reached based on the relationship with the amount of water increase in the mountain .

[2] The scattering prevention limit according to the above [1], wherein the scattering prevention limit moisture content is set according to the type, brand, and particle size of the piles, based on the result of visual observation of dust generation in a wind tunnel experiment. Prevent watering method.

  [3] The scattering prevention sprinkling method according to [1] or [2], wherein the surface of the pile is divided into blocks, and the amount of water is measured for each block to spray water.

  In the present invention, water is sprayed on the sedimentary mountain based on the amount of water measured by the moisture meter, so that watering is performed at an appropriate timing, while suppressing adverse effects on product quality due to excessive watering. It is possible to prevent dust from being scattered accurately without taking a day and night.

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a scattering prevention watering system according to an embodiment of the present invention. This scattering prevention watering system includes a moisture sensor (moisture meter) 11, a control arithmetic device 12, a watering control device 13, and a plurality of watering control devices. A watering device 14 is provided. In addition, 10 in FIG. 1 is a pile (deposition mountain) of deposits such as iron ore and coal, and the surface of the pile 10 is divided into blocks for each watering range of the watering device 14. .

  Here, the moisture sensor 11 is of a non-contact type. For example, a near-infrared moisture meter that applies the principle that light having a specific wavelength of near-infrared is absorbed in proportion to the amount of moisture (moisture content) is used. It is used. Note that a movable device (not shown) is attached to the moisture sensor 11 so that the moisture content data of each block can be collected by scanning the pile 10 with one unit.

  The control arithmetic device 12 controls the movement of the moisture sensor 11 and calculates the moisture amount (average moisture amount) of each block based on the collected data from the moisture sensor 11. When there is a block in which the obtained moisture amount is below a predetermined scattering prevention limit moisture amount (for example, 8%), a signal for performing watering to the block is sent to the watering control device 13. It is like that.

  And the watering control apparatus 13 receives the signal from the control arithmetic unit 12, opens and closes the valve of the watering apparatus 14 installed in the block, and controls the start and stop of watering.

  At that time, in order to avoid excessive watering, a target water amount after watering (for example, 10%) is determined, and the relationship between the separately calculated watering time and the amount of increase in water content in the sedimentary mountain The watering time (time from the start of watering to the time of watering stop) is adjusted so that the target moisture amount is reached, and watering is performed.

  The above-mentioned scattering prevention limit moisture content is set according to the type of pile (coal, iron ore, etc.), brand, particle size, etc., based on the result of visual observation of dust generation in a wind tunnel experiment.

  The target water content after watering is a value determined so as not to adversely affect the quality of the product (for example, insufficient coke strength, heat load on the blast furnace, etc.).

  In the scattering prevention watering system comprised in this way, watering for scattering prevention is performed as follows.

  (1) First, according to an instruction from the control arithmetic unit 12, the moisture sensor 11 scans the middle of the pile 10 every predetermined time (for example, every three hours), and the moisture amount data of each block of the pile 10 is obtained. Collect.

  (2) Next, the control calculation device 12 calculates the average moisture content of each block based on the collected moisture content data.

  (3) When there is a block in which the obtained average moisture content is below a predetermined scattering prevention limit moisture content (for example, 8%), the control arithmetic device 12 applies to the water spray control device 13. Send a signal to the relevant block.

  (4) Upon receiving the watering execution signal from the watering control device 13, the control arithmetic device 12 opens the valve of the watering device 14 of the corresponding block and starts watering to the corresponding block.

  (5) Then, after performing watering for a watering time determined so as to become the target water content (for example, 10%), the control arithmetic device 12 closes the valve of the watering device 14 and the watering device 14 Stop watering.

  (6) The above steps (1) to (5) are repeated.

  In this way, in this embodiment, since water is sprayed to the pile 10 based on the amount of water measured by the moisture sensor 11, water is sprayed at an appropriate timing, and the product due to excessive water spraying. While suppressing adverse effects on quality, it is possible to accurately prevent dust scattering without taking a day or night.

  Examples of the present invention will be described.

  Here, water spray for scattering prevention was performed based on the above-described embodiment for a pile of iron ore. The water content was measured every 3 hours, the scattering prevention limit water content was set to 8%, and the target water content after watering was set to 10%.

  As a result, even during strong winds and at night, dust was not scattered from the piles, and dust generation could be prevented efficiently.

It is explanatory drawing of one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sedimentary mountain 11 Moisture sensor 12 Control arithmetic device 13 Watering control device 14 Watering device

Claims (2)

A scattering prevention sprinkling method for preventing dust from splashing by depositing water on a mountain pile deposited outdoors, and dividing the surface of the pile mountain into blocks for each watering range of the watering device, and for a predetermined time. Each time the sedimentary mountain is scanned by a moisture meter that can move independently of the watering device , moisture content data of each block is collected, and the average moisture content of each block is calculated from the collected moisture content data If the obtained average moisture content is below the predetermined scattering prevention limit moisture content, water is sprayed to the block on the surface of the pile, and the target moisture content after sprinkling is determined in advance. Based on the relationship between the separately obtained watering time and the amount of increase in the amount of moisture in the sedimentary mountain, the watering time is adjusted so that the target water amount is obtained, and then the watering is prevented. .   The scattering prevention watering method according to claim 1, wherein the scattering prevention limit moisture amount is set according to the type, brand, and particle size of the piles, based on the result of visual observation of dust generation in a wind tunnel experiment.

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