A dust reduction method and equipment for dry bulk port

Abstract

The invention discloses a dust reduction method and equipment for a dry bulk port, the dust reduction equipment comprises a base, a rotating plate is arranged on the base, a movable bottom plate is arranged on the rotating plate, a second connecting rod assembly capable of driving a nozzle to move back and forth is arranged on the movable bottom plate, a throttle valve and a third connecting rod assembly capable of driving the movable bottom plate to move up and down are arranged on the rotating plate, the nozzle comprises two parallel water pipes, and the inlet of the throttle valve is connected to a water supply device; the dust reduction method comprises S1, real-time monitoring of PM2.5 and PM10 concentrations through an air quality sensor, if any concentration of PM2.5 and PM10 exceeds the standard, the flow rate of the throttle valve is adjusted to the maximum, a strong spray mode is started, etc.; the beneficial effects of the invention are as follows: during dust reduction, the automatic and intelligent control of the spraying equipment can be realized through the setting of multiple sensors, manual labor is reduced, and while ensuring the dust reduction effect, the waste of water resources is also reduced.

Description

Technical Field

[0001] The invention relates to the technical field of port dust removal spraying, and in particular to a dust reduction method and equipment for a dry bulk material port. Background Art

[0002] The materials piled up in the dry bulk port are mainly sand and gravel and other construction materials. During use, the yard has the following characteristics: 1. Open-air: greatly affected by wind speed, light, temperature and weather; 2. Large area, basically more than 10,000 square meters; 3. The yard is large in size, about 3m in height, and manual operation is at risk of landslide; 4. The size, shape and volume of the material stacking area and the yard change dynamically, and dry bulk materials are concentrated in ships and shipped out by scattered trucks; 5. The port / wharf is close to living areas and waters, and has high environmental protection requirements; 6. Dry bulk materials, especially sand and gravel, have high water permeability and do not absorb water; 7. The spraying volume and spraying time are affected by the size of the reservoir. Long-term continuous use will cause the water to dry up and cannot continue spraying.

[0003] The patent with publication number "CN114832547A" discloses "an intelligent mobile spray dust reduction method and device". The device mainly uses a learning model to predict the dust situation in the construction area, and combines historical construction data and attribute data to more accurately formulate dust removal strategies and improve dust removal effects; however, for dry bulk ports, the working conditions are different every day and even every moment, and it is impossible to formulate dust removal strategies based on historical data. Summary of the invention

[0004] The purpose of the present invention is to provide a dust reduction method and equipment for a dry bulk port, which can timely adjust the spray intensity and spray angle according to the working conditions, thereby improving the dust reduction effect and saving water resources.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A dust suppression device for a dry bulk port, comprising a base, a rotating plate is arranged on the base, a movable bottom plate is arranged on the rotating plate, a second connecting rod assembly capable of driving a nozzle to move back and forth is arranged on the movable bottom plate, a throttle valve and a third connecting rod assembly capable of driving the movable bottom plate to move up and down are arranged on the rotating plate; The spray pipe comprises two parallel water pipes, the inlet of the throttle valve is connected to a water supply device, the outlet of the throttle valve is respectively connected to the inlets of the two water pipes through a three-way solenoid valve, and the outlets of the two water pipes are respectively provided with a spray nozzle and an atomizing nozzle.

[0006] Preferably, the dust reduction equipment further comprises a guide rail on which a base is placed, and the base is provided with a power device for driving the base to move along the guide rail.

[0007] Preferably, a first connecting rod assembly capable of driving the rotating plate to rotate is provided on the base.

[0008] Preferably, the first connecting rod assembly includes a first motor arranged on a base, the output shaft of the first motor is connected to one end of a first connecting rod, the other end of the first connecting rod is connected to one end of a second connecting rod through a fisheye bearing, and the other end of the second connecting rod is connected to the outer edge of the rotating plate through a fisheye bearing.

[0009] Preferably, the second connecting rod assembly includes a second motor arranged on the rotating plate, the output shaft of the second motor is connected to one end of the third connecting rod, the other end of the third connecting rod is connected to one end of the fourth connecting rod, and the other end of the fourth connecting rod is connected to the movable bottom plate.

[0010] Preferably, the third connecting rod assembly includes a telescopic rod and a connecting plate arranged on a movable bottom plate, the upper end of the connecting plate has a fixed plate, a third motor is arranged on the fixed plate, the output shaft of the third motor passes through the fixed plate and is connected to one end of the fifth connecting rod, the fixed plate is provided with a circumferential groove for the other end of the fifth connecting rod to rotate, the other end of the fifth connecting rod is also respectively connected to one end of the sixth connecting rod and the seventh connecting rod, the other end of the sixth connecting rod is connected to the movable end of the telescopic rod, and the other end of the seventh connecting rod is connected to the nozzle.

[0011] Preferably, an outer sleeve for accommodating the nozzle is provided on the movable end of the telescopic rod, and a space for the nozzle to reciprocate is formed in the outer sleeve; A guide groove is provided on the side wall of the outer sleeve, and the other end of the seventh connecting rod is provided with a claw which can extend into the guide groove and connect with the outer edge of the nozzle.

[0012] Preferably, the present invention further discloses a dust reduction method for a dry bulk port, using the aforementioned dust reduction equipment, the dust reduction method is as follows: S1, the throttle valve opens at a certain time interval, and the flow rate is adjusted to the maximum, starting the powerful spray mode; S2. The concentration of PM2.5 and PM10 is monitored in real time through the air quality sensor. If the concentration of either PM2.5 or PM10 exceeds the standard, the flow rate of the throttle valve is adjusted to the maximum and the strong spray mode is started; When S3, PM2.5 and PM10 do not exceed the standard, the system enters the dust suppression mode, monitors the wind speed and direction in real time through the wind sensor, and uses different spray modes on the windward and leeward sides according to the wind speed; S4. Real-time monitoring of the temperature of the leeward side of the bulk material is performed through a temperature sensor. When the wind speed is in a low speed range, a weak intensity spraying mode is performed on the leeward side of the bulk material in the high temperature area; S5. Real-time monitoring of bulk materials is performed through visual sensors to determine their dryness and wetness. When the wind speed is in the low wind speed range, the leeward side of the bulk materials in the low temperature area, if the bulk materials are in a dry state, is sprayed in a weak intensity spray mode; if the bulk materials are in a non-dry state, is sprayed in an atomized mode.

[0013] Preferably, in step S3, the spraying modes for different wind speeds are as follows: at high wind speed, the flow rate of the throttle valve is adjusted to the maximum, and the strong spraying mode is started; at medium wind speed, the flow rate of the throttle valve of the dust reduction equipment on the windward side is adjusted to medium, and medium-intensity spraying is performed, and the flow rate of the throttle valve of the dust reduction equipment on the leeward side is adjusted to the minimum, and weak-intensity spraying is performed; at low wind speed, the flow rate of the throttle valve of the dust reduction equipment on the windward side is adjusted to the minimum, and weak-intensity spraying is performed.

[0014] The beneficial effects of the present invention are: 1. The nozzle can be driven to rotate by the setting of the rotating plate, and the nozzle can be driven to swing up and down by the setting of the second connecting rod assembly. The nozzle can slide up and down and move forward and backward slightly by the setting of the third connecting rod assembly, so as to meet the needs of different spraying positions and spraying angles. At the same time, the spraying intensity of the nozzle can be adjusted by the throttle valve. When the flow rate increases, it enters the strong spray mode, and when it decreases, it enters the weak spray mode.

[0015] 2. By setting the guide rail, the moving distance of the dust suppression equipment can be greatly increased. By setting the telescopic rod, the aerial moving range of the nozzle can also be increased, thereby improving the spraying range and spraying efficiency.

[0016] 3. When this method is used to reduce dust in dry bulk ports, it can achieve automatic and intelligent control of the spraying equipment through the setting of multiple sensors, reducing manual labor. While ensuring the dust reduction effect, it also reduces the waste of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of the dust suppression equipment and guide rails of the present invention; Figure 2 A three-dimensional diagram of the dust suppression equipment of the present invention; Figure 3 It is a three-dimensional diagram of the dust suppression equipment of the present invention from another angle.

[0018] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings. Example

[0020] like Figure 1 — Figure 3 As shown, a dust suppression device for a dry bulk port includes a base 1 and a guide rail 100, a rotating plate 2 is arranged on the base 1, a fixed bottom plate 21 is arranged on the rotating plate 2, a movable bottom plate 22 is arranged on the fixed bottom plate 21, a second connecting rod assembly that can drive a nozzle 6 to move back and forth is arranged on the movable bottom plate 22, a throttle valve 7 and a third connecting rod assembly that can drive the movable bottom plate 22 to move up and down are arranged on the rotating plate 2, the nozzle 6 is composed of two parallel water pipes with the same structure, the inlet of the throttle valve 7 is connected to the water supply device, and the throttle valve 7 is connected to the water supply device. The outlet of valve 7 is connected to the inlet of two water pipes through three-way electromagnetic valve 71, and the outlets of the two water pipes are respectively provided with a spray nozzle and an atomizing nozzle; the on-off of the spray nozzle or the atomizing nozzle is controlled by controlling the on-off of the three-way electromagnetic valve 71 (when the spray nozzle is connected, the atomizing nozzle is disconnected, and vice versa). When the spray nozzle is started, according to the flow adjustment of the throttle valve 7, three modes of strong spray, medium-intensity spray and moderate-intensity spray can be started respectively; when the atomizing nozzle is started, the flow of the throttle valve 7 is adjusted to the minimum to start the atomizing mode. The throttle valve 7 is also provided with a moving rod that can control its flow. The moving rod can be connected to equipment such as a cylinder and a motor. By changing the distance that the moving rod extends into the throttle valve 7, the flow of the throttle valve 7 is adjusted, and then the spraying amount (i.e., the spraying intensity) of the nozzle is adjusted. The structure and principle of the throttle valve are conventional technologies and will not be described in detail in this embodiment. When in use, under the action of the water pump, water enters the nozzle along the throttle valve 7 and the nozzle 6 to spray the area to be dusted. Through the arrangement of the second connecting rod assembly, the third connecting rod assembly and the rotating plate 2, the operating range and spraying angle of the nozzle are increased, thereby improving the spraying effect.

[0021] The base 1 is placed on the guide rail 100. The base 1 is provided with a power device that drives it to move along the guide rail 100. The power device can be a motor, a cylinder, or other equipment. The bottom of the base 1 is also provided with a running wheel that cooperates with the guide rail 100 to make the moving process more stable. At the same time, a baffle can also be installed on the guide rail 100 to reduce the entry of sand and dust.

[0022] A first connecting rod assembly is provided on the base 1 for driving the rotating plate 2 to rotate. In this embodiment, a bearing is installed in the middle of the base 1. The rotating plate 2 is installed on the base 1 through the bearing and can rotate flexibly along the base 1.

[0023] The first connecting rod assembly includes a first motor 3 disposed on the base 1, the output shaft of the first motor 3 is connected to one end of the first connecting rod 31, the other end of the first connecting rod 31 is connected to one end of the second connecting rod 32 through a fisheye bearing, and the other end of the second connecting rod 32 is connected to the outer edge of the rotating plate 2 through the fisheye bearing. When the first motor 3 rotates, the first connecting rod 31 and the second connecting rod 32 will push the rotating plate 2 to rotate, and through the setting of the fisheye bearing, the second connecting rod 32 can move laterally along the rotation direction of the first connecting rod 31 to a certain extent, so that when the rotating plate 2 rotates, it can also maintain the connection with the second connecting rod 32. The structure and principle of the fisheye bearing are conventional technologies and will not be described in detail in this embodiment.

[0024] The second connecting rod assembly includes a second motor 4 disposed on the rotating plate 2, the output shaft of the second motor 4 is connected to one end of the third connecting rod 41, the other end of the third connecting rod 41 is connected to one end of the fourth connecting rod 42, the other end of the fourth connecting rod 42 is connected to one end of the movable bottom plate 22, and the other end of the movable bottom plate 22 is connected to the fixed bottom plate 21. When the second motor 4 rotates, it can drive the third connecting rod 41 and the fourth connecting rod 42 to move back and forth, thereby driving the movable bottom plate 22 and the nozzle 6 disposed thereon to swing up and down, so as to adjust the spraying position.

[0025] The third connecting rod assembly includes a telescopic rod 23 and a connecting plate 24 arranged on the movable bottom plate 22, the upper end of the connecting plate 24 has a fixed plate 51, the fixed plate 51 is provided with a third motor 5, the output shaft of the third motor 5 passes through the fixed plate 51 and is connected to one end of the fifth connecting rod 52, the fixed plate 51 is provided with a circumferential groove for the other end of the fifth connecting rod 52 to rotate, the other end of the fifth connecting rod 52 is also connected to one end of the sixth connecting rod 53 and the seventh connecting rod 54 respectively, the other end of the sixth connecting rod 53 is connected to the movable end of the telescopic rod, and the other end of the seventh connecting rod 54 is connected to the nozzle 6. In this embodiment, the lower end of the telescopic rod 23 is fixed on the movable bottom plate 22, and the upper end can be telescopic in the lower end.

[0026] An outer sleeve 61 for accommodating the nozzle 6 is provided on the movable end of the telescopic rod 23, and a space for the nozzle 6 to reciprocate is formed in the outer sleeve 61; A guide groove 62 is provided on the side wall of the outer sleeve 61, and the other end of the seventh connecting rod 54 has a claw 55 that can be inserted into the guide groove 62 to connect to the outer edge of the nozzle 6. When the third motor 5 rotates, the fifth connecting rod 52 rotates accordingly, which can drive the sixth connecting rod 53 and the seventh connecting rod 54 to move accordingly. The movement of the sixth connecting rod 53 can drive the telescopic rod 23 to extend and retract, thereby driving the outer sleeve 61 and the nozzle 6 to move up and down to adjust the spraying angle. The movement of the seventh connecting rod 54 can drive the nozzle 6 to move in the outer sleeve 61, thereby driving the nozzle to move.

[0027] In addition, this embodiment also discloses a dust reduction method for a dry bulk port, using the aforementioned dust reduction equipment, the dust reduction method is as follows: S1. Every 3 hours, the throttle valve is opened and the flow rate is adjusted to the maximum, and the strong spray mode is started, each time lasting 15 minutes; S2. The concentration of PM2.5 and PM10 is monitored in real time by an air quality sensor. If any of the concentrations of PM2.5 and PM10 exceeds the standard, the flow rate of the throttle valve is adjusted to the maximum, and the strong spray mode is started. In this embodiment, the standard value adopted is: PM2.5 is greater than 67μg / m³ or PM10 is greater than 135μg / m³. In some embodiments, different standard values ​​can also be formulated according to local environmental protection standards and different sizes of nozzles, throttle valves and nozzles.

[0028] S3. If PM2.5 and PM10 do not exceed the standard, the system enters the dust suppression mode, monitors the wind speed and direction in real time through the wind sensor, and performs different spraying modes on the windward and leeward sides of the bulk material according to the different wind speeds; in this embodiment, the targeted bulk material is sand; in some embodiments, the targeted bulk material may also be solid particulate bulk material such as ore and coal.

[0029] In this embodiment, when the wind speed reaches level 8 or above, it is determined to be a high wind speed, at which time the flow of the throttle valve is adjusted to the maximum, and the strong spray mode is started; when the wind speed is level 4-7, it is determined to be a medium wind speed, at which time the throttle valve flow of the windward dust suppression equipment is adjusted to medium, and medium-intensity spraying is performed, and the throttle valve flow of the leeward dust suppression equipment is adjusted to the minimum, and weak-intensity spraying is performed; when the wind speed is level 3 or below, it is a low wind speed, and the throttle valve flow of the windward dust suppression equipment is adjusted to the minimum, and weak-intensity spraying is performed. In some embodiments, different standard values ​​for wind speed can also be set according to different sizes of nozzles, throttle valves, and nozzles.

[0030] S4. When the wind speed is in the low wind speed range of level 3 or below, the temperature of the leeward side of the bulk material can also be monitored in real time through a temperature sensor. 30°C or above is considered high temperature, and below 30°C is considered low temperature. Under high temperature conditions, a weak intensity spray mode is applied to the leeward side of the bulk material to prevent water from evaporating too quickly. S5. When the wind speed is in the low wind speed interval of level 3 or below, and the temperature sensor determines that the temperature on the leeward side of the bulk material is a low temperature below 30°C, the bulk material can also be monitored in real time by a visual sensor, and the area of ​​the shadow part and the degree of illumination can be visually judged. The higher the reflectivity, the drier the sand. The judgment principle is as follows: first, a visual photograph of the standard humidity sand is taken, and the brightness of the photograph is recorded as a standard photograph. The comparison relationship between the brightness of the photograph and the humidity is established through an algorithm. Then, the photographed photograph is compared with the standard photograph to identify the humidity of the sand. The research on this algorithm is a prior art. This embodiment only uses visual photography to measure the humidity of the stockpile material, and the judgment process is not described in detail.

[0031] If the bulk material is in a dry state, that is, the humidity is less than or equal to 70%, the leeward side of the bulk material will be sprayed in a weak-intensity spray mode; if the bulk material is in a non-dry state, that is, the humidity is greater than 70%, the leeward side of the bulk material will be sprayed in an atomization mode.

[0032] It should be noted that in the aforementioned step S5, the visual sensor is mainly used during the day when the lighting conditions are good. When the use conditions are not met, a weak-intensity spray mode can be performed on the leeward side of the bulk material in a low wind speed range and low temperature conditions.

[0033] In the above-mentioned dust reduction method, the criteria for determining high and low temperatures, and the criteria for determining the dryness and wetness of sand can also be changed according to specific dust prevention requirements and the different sizes of nozzles, throttle valves and nozzles, and can also be dynamically adjusted according to changes in the season and weather of the yard materials.

[0034] After use, this embodiment can realize automatic, intelligent and efficient dust reduction for dry bulk materials. According to the storage and operation scenarios of the dry bulk terminal, a reasonable sensor layout is designed to accurately detect the surrounding environmental data (such as PM2.5, PM10, temperature, humidity, wind speed and wind direction, etc.); develop an intelligent dust reduction algorithm based on the operation process, environmental weather, material form, and dust pollution parameters, and automatically adjust the dust reduction strategy according to the data to achieve targeted and efficient dust reduction effects; the dust reduction equipment of this embodiment includes a spray and atomization device, and the spray nozzle can be rotated and adjusted in all directions, and can also be intelligently controlled according to environmental monitoring data. A variety of working strategies are combined to meet different dust reduction needs.

[0035] The above embodiments do not impose any formal limitations on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

[0036] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0037] If the words "first", "second", etc. are used in this document to limit components, those skilled in the art should know that the use of "first" and "second" is only to facilitate the description of the present invention and simplify the description. Unless otherwise stated, the above words have no special meaning.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dust suppression device for a dry bulk port, comprising a base, characterized in that: The base is provided with a rotating plate, the rotating plate is provided with a movable bottom plate, the movable bottom plate is provided with a second connecting rod assembly capable of driving the nozzle to move back and forth, the rotating plate is provided with a throttle valve and a third connecting rod assembly capable of driving the movable bottom plate to move up and down; The spray pipe comprises two parallel water pipes, the inlet of the throttle valve is connected to a water supply device, the outlet of the throttle valve is respectively connected to the inlets of the two water pipes through a three-way solenoid valve, and the outlets of the two water pipes are respectively provided with a spray nozzle and an atomizing nozzle.

2. The dust suppression equipment for dry bulk ports according to claim 1, characterized in that: It also includes a guide rail for placing the base, and the base is provided with a power device for driving the base to move along the guide rail.

3. The dust suppression equipment for dry bulk port according to claim 1, characterized in that: The base is provided with a first connecting rod assembly which can drive the rotating plate to rotate.

4. The dust suppression equipment for dry bulk ports according to claim 3, characterized in that: The first connecting rod assembly includes a first motor arranged on a base, the output shaft of the first motor is connected to one end of the first connecting rod, the other end of the first connecting rod is connected to one end of the second connecting rod through a fisheye bearing, and the other end of the second connecting rod is connected to the outer edge of the rotating plate through a fisheye bearing.

5. The dust suppression equipment for dry bulk port according to claim 1, characterized in that: The second connecting rod assembly includes a second motor arranged on the rotating plate, the output shaft of the second motor is connected to one end of the third connecting rod, the other end of the third connecting rod is connected to one end of the fourth connecting rod, and the other end of the fourth connecting rod is connected to the movable bottom plate.

6. The dust suppression equipment for dry bulk port according to claim 1, characterized in that: The third connecting rod assembly includes a telescopic rod and a connecting plate arranged on a movable bottom plate, the upper end of the connecting plate is provided with a fixed plate, a third motor is arranged on the fixed plate, the output shaft of the third motor passes through the fixed plate and is connected to one end of the fifth connecting rod, a circular groove is provided on the fixed plate for the other end of the fifth connecting rod to rotate, the other end of the fifth connecting rod is also connected to one end of the sixth connecting rod and the seventh connecting rod respectively, the other end of the sixth connecting rod is connected to the movable end of the telescopic rod, and the other end of the seventh connecting rod is connected to the nozzle.

7. The dust suppression equipment for dry bulk port according to claim 6, characterized in that: An outer sleeve for accommodating the nozzle is arranged on the movable end of the telescopic rod, and a space for the nozzle to reciprocate is formed in the outer sleeve; A guide groove is provided on the side wall of the outer sleeve, and the other end of the seventh connecting rod is provided with a claw which can extend into the guide groove and connect with the outer edge of the nozzle.

8. A dust reduction method for a dry bulk port, characterized in that: Using the dust suppression equipment according to claim 1, the dust suppression method is as follows: S1, the throttle valve opens at a certain time interval, and the flow rate is adjusted to the maximum, starting the powerful spray mode; S2. The concentration of PM2.5 and PM10 is monitored in real time through the air quality sensor. If the concentration of either PM2.5 or PM10 exceeds the standard, the flow rate of the throttle valve is adjusted to the maximum and the strong spray mode is started; When S3, PM2.5 and PM10 do not exceed the standard, the system enters the dust suppression mode, monitors the wind speed and direction in real time through the wind sensor, and uses different spray modes on the windward and leeward sides according to the wind speed; S4. Real-time monitoring of the temperature of the leeward side of the bulk material is performed through a temperature sensor. When the wind speed is in a low speed range, a weak intensity spraying mode is performed on the leeward side of the bulk material in the high temperature area; S5. Real-time monitoring of bulk materials is performed through visual sensors to determine their dryness and wetness. When the wind speed is in the low wind speed range, the leeward side of the bulk materials in the low temperature area, if the bulk materials are in a dry state, is sprayed in a weak intensity spray mode; if the bulk materials are in a non-dry state, is sprayed in an atomized mode.

9. A dust reduction method for a dry bulk port according to claim 8, characterized in that: In the step S3, the spraying modes for different wind speeds are: at high wind speed, the flow rate of the throttle valve is adjusted to the maximum, and the strong spraying mode is started; at medium wind speed, the flow rate of the throttle valve of the dust reduction equipment on the windward side is adjusted to medium, and medium-intensity spraying is performed, and the flow rate of the throttle valve of the dust reduction equipment on the leeward side is adjusted to the minimum, and weak-intensity spraying is performed; at low wind speed, the flow rate of the throttle valve of the dust reduction equipment on the windward side is adjusted to the minimum, and weak-intensity spraying is performed.

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