CN106907055A - A kind of dust suppression anti-wind net for realizing self adaptation wind direction adjustment - Google Patents

Abstract

The invention discloses a dust-suppressing and wind-proof net for self-adaptive wind direction adjustment. On the track, a motor is arranged at one end of the arc-shaped dust-proof net, and the rotating shaft of the motor is fixedly connected with the roller shaft of a corresponding rolling pulley through the transmission structure to drive the roller to move on the circular track through the motor. A wind direction sensor is installed in the center of the top of the arc-shaped dust-proof net or a wind-direction sensor is installed symmetrically on the top of the arc-shaped dust-proof net. The adoption of the device reduces the layout area of the windproof net and improves the effective space for storing and retrieving materials.

Description

A dust-suppressing and wind-proof net that realizes intelligent adjustment of adaptive wind direction

technical field

The invention relates to a dust-suppressing and wind-proof net, in particular to a dust-suppressing and wind-proof net for realizing adaptive wind direction intelligent adjustment.

Background technique

my country's energy consumption is mainly based on coal ore. With the rapid growth of the national economy, the consumption of coal and ore in my country has increased year by year, and the dust brought by the storage and operation of the storage yard has become increasingly serious in air pollution. , so the environmental protection of the port should start from the dust prevention and control of the storage yard. At the same time, the dust will cause a large amount of material loss and bring huge economic losses to the port bulk storage yard. In addition, due to the generally small particle size of the dust and the large pollution radius, the concentration of sensitive indicators such as PM2.5 in the atmospheric environment around the stockyard often exceeds the standard by dozens of times, seriously affecting the health of the stockyard staff and surrounding residents. . In order to effectively prevent and control this kind of environmental pollution, it is very necessary to study the dust generation and dust suppression technology in bulk cargo yards.

The windproof net mainly has an obvious dust suppression effect on the coal pile in the shelter area by reducing the wind speed behind the net. The range of the shelter area is related to the height of the net. According to the results of wind tunnel tests, it is generally believed that the effective shelter area of the windproof net is within the range of about 20 times the height of the net in the downwind direction. Within the effective shelter area, the amount of dust generated by the coal pile can be reduced by 80%. The greater the wind speed, the more significant the effect of the windproof net on reducing the wind speed. The windproof net has a good restrictive effect on the dust generation and diffusion of coal, and its dustproof effect has been widely recognized. Relevant monitoring shows that the dustproof effect of the windproof net can reach 50%-70%, and the highest can reach 90%.

The dust problem of windproof nets to open dust sources has always been the focus of research by scholars at home and abroad. The dust problem is essentially the mass migration of dust particles under the action of natural wind. On the premise of effectively controlling the wind speed field around the dust, the windproof net can effectively suppress the dust-generating power of the dust, thereby effectively reducing the amount of dust generated by the dust. Regarding the research on the wind-proof net, Geng Yu [Geng Yu. Experimental research on wind speed and turbulence in the wake area of the wind-proof net [D]. Tianjin: Tianjin University, 2002.] conducted a study on the wind speed and turbulence intensity in the wake area of the wind-proof net Experimental research has obtained the control efficiency of the air flow state in the wake area of different windscreens on the amount of dust generated. Shen Xi [Shen Xi. Application status of wind-proof net and dust-proof technology in open-pit coal yards and suggestions for the development of wind-proof net and dust-proof technology in my country [J]. Traffic Environmental Protection, 1995, 16(3): 22～25.] for The application status of windproof net technology in open pit coal yard and the development status of windproof net in my country are studied, and corresponding technical suggestions and opinions are put forward. However, the above-mentioned studies on the windproof net mainly focus on the dustproof mechanism of the windproof net (wind speed, wind energy and wind turbulence intensity), the structure of the windproof net (shape, number of layers, opening ratio), the setting of the windproof net (height, width, Distance), etc., few people have conducted in-depth analysis and research on the dynamic windproof net that adjusts its orientation with the wind direction.

Contents of the invention

The purpose of the present invention is to overcome the defects of the prior art, to provide a windproof net that reduces the layout area, improves the effective space for accessing and stacking materials, saves the storage yard space, improves the use efficiency of the storage yard, and saves dust suppression. Cost-effective dust-suppression and wind-proof nets with intelligent adjustment of self-adaptive wind direction.

A dust-suppressing and wind-proof net for adaptive wind direction adjustment, comprising an arc-shaped dust-proof net, a plurality of rolling pulleys are installed at the bottom of the arc-shaped dust-proof net, and the plurality of rolling pulleys are slidably connected to the On the circular track, a motor is arranged at one end of the arc-shaped dust-proof net, and the rotating shaft of the motor is fixedly connected with the roller shaft of a corresponding rolling pulley through the transmission structure to drive the roller through the motor. Moving on a circular track, a wind direction sensor is installed in the center of the top of the arc-shaped dust net or a wind direction sensor is installed symmetrically on the top of the arc-shaped dust net, and the wind direction The windward side of the sensor is set parallel to the tangential direction of the arc-shaped windproof net. The surface of the wind direction sensor can sense the wind direction of the incoming wind speed, and process the read wind direction change angle signal, and then output the rotation angle to the drive motor The signal drives the rolling wheel to slide until the incoming wind received by the wind direction sensor is perpendicular to the sensor again.

The beneficial effects of the present invention are as follows: the windproof net can intelligently adjust the position of the windproof net according to the wind direction to control the stacking of dust, which overcomes the problem that the windproof net needs to be built around the stacking, reduces the layout area of the windproof net, and improves the access to the pile. The effective space for materials improves the efficiency of the storage yard and saves the cost of dust suppression.

Description of drawings

Fig. 1 is a schematic top view of the structure of a dust-suppressing and wind-proof net that realizes self-adaptive wind direction adjustment in the installation and use state of the present invention;

Fig. 2 is the structural representation when the opening angle of the dust suppression and windproof net of the present invention is 150°;

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1 and Figure 2, a dust-suppressing and wind-proof net that realizes adaptive wind direction adjustment includes an arc-shaped dust-proof net 1, and a plurality of scrolls are installed at the bottom of the arc-shaped dust-proof net 1. Pulley 2, the plurality of rolling pulleys 2 are slidably connected on the circular track 5, a motor 3 is arranged at one end of the arc-shaped dust-proof net 1, and the rotating shaft of the motor 3 is respectively passed through the transmission The structure (transmission structure such as gears can be used) is fixedly connected with the roller shaft of a corresponding rolling pulley 2 to drive the roller to move on the circular track 5 through the motor, and install it in the center of the top of the arc-shaped dust-proof net 1 There is a wind direction sensor 4 or a wind direction sensor 4 is symmetrically installed on the top of the arc-shaped dustproof net 1 . The windward surface of the wind direction sensor 4 is arranged parallel to the tangential direction of the arc-shaped windproof net, and the surface of the wind direction sensor can sense the wind direction of the incoming wind speed, and change the angle (positive or negative) of the read wind direction. Signal) signal is processed, then to the drive motor 3 output rotation angle signal to drive the rolling wheel 2 to slide until the incoming wind received by the wind direction sensor is perpendicular to the sensor again.

The wind direction sensor is available on the market.

Through the arrangement of the circular windproof net, the influence of different wind directions on the dust suppression effect of the windproof net can be eliminated, so that the windproof net is always in the optimal dust suppression position.

Preferably, the central angle of the arc-shaped dustproof net 1 is 120°-240°.

The preferred porosity of the arc-shaped dust-proof net 1 is 40%-50%. Porosity is one of the main structural indicators of the windproof net, which is the ratio of the ventilation area of the windproof net to the total area. When the porosity is around 20%, the turbulence intensity and drag coefficient of the air around the void are unstable, and the windproof net bears a relatively high pressure, which is also unfavorable for the structural setting of the windproof net. When the porosity is between 40% and 50%, the turbulence intensity of the wind field in the wake area behind the windproof net is reduced, and it can be a long and stable one, effectively increasing the dust shielding area. When the porosity is greater than 50%, the windproof net will not have a good shelter effect.

Preferably, the height of the arc-shaped dustproof net 1 is 1.1 to 1.5 times the height of the pile. The height of the windproof net should mainly depend on the height of the stacking material. When the height of the windproof net is less than 1.1 times the height of the stacking material, the effect of windproof and dust suppression is not ideal; The windproof and dust suppression effect of the net has little influence, and at this time also causes the waste of the windproof net material.

Preferably, the stacking pitch of the arc-shaped dust-proof net 1 is 1.0 to 1.5 times the stacking height. The stacking net spacing refers to the shortest distance from the bottom of the windproof net to the bottom edge of the stacking material. When the stacking distance is less than 1.0 times the stacking height, the wind will form a pressure difference between the bottom and the top of the stack after passing through the windproof net. When the mesh spacing is greater than 1.5 times the stacking height, not only the windproof and dust suppression effect is not obvious, but also the area of the stacking operation site will be increased, resulting in a waste of land resources.

Example

Taking the amount of dust generated by typical air pollution particles PM2.5 and PM10 as an example, a typical annual average wind speed of 4.1m/s in a port area is selected as the wind speed at a monitoring height of 10m. Due to the simulation of the stockyard conditions where the wind direction is constantly changing, a typical circular frustum-shaped stockpile is selected as the geometric object of the numerical simulation. The bottom radius of the circular truss is 50m, the top radius is 29.5m, and the height is 17m.

Due to the different opening sizes of the windproof net, the material consumption of the windproof net is different. In the case of ensuring a high dust suppression efficiency, in order to save the consumption of building materials for the windproof net, and avoid the drastic change in the dust suppression effect of the windproof net due to the shortening of the net length. In the worst case, here is a comparison of the dust suppression effect of circular windproof nets with different opening sizes. Select no windproof net and five other circular windproof nets as a comparison. The angles between the five windproof nets and the center of the circle are 90°, 120°, 150°, 240° and 270° respectively, and PM2.5 and PM10 The dust suppression effect is measured by the intensity of the emission source under different water content conditions, and the results are shown in Table 1.

Table 1 Intensity of typical pollutant particle emission sources with different opening sizes

According to the above calculation results, the following conclusions can be drawn:

(1) Combined with better sprinkler and dust suppression measures, the circular windproof net with an opening size of 90° can reduce the dust emission of PM2.5 and PM10 by more than 96%; % above PM2.5 and PM10 dust generation; the circular windproof net with an opening size of 150° can reduce the dust emission of more than 98% PM2.5 and PM10; the circular windproof net with an opening size of 240° can reduce 98% % of PM2.5 and PM10 dust emissions; the circular windscreen with an opening size of 270° can reduce more than 96% of PM2.5 and PM10 dust emissions.

(2) The emission source intensity of typical pollutant particles decreases gradually with the increase of water content and decreases with the decrease of wind speed. Moreover, judging from the dust suppression effect of windscreens with different lengths, it is not that the longer the windscreen, the better the dustproof performance. The dust suppression effect of the circular windscreen is the best when the opening angle is 150°-240°. Effect.

(3) Since the circular windproof net can ensure that the windproof net is always perpendicular to the incoming wind, the opening size of the windproof net will affect the emission of particulate matter when the windproof net basically covers the stockpile.

Considering economic factors and dust suppression effect comprehensively, it is determined that the circular dust suppression and windproof net with an opening angle in the range of 120°-240° is the best circular dust suppression net, and the opening angle can be determined according to the change of local wind direction. Choose windproof nets with large opening angles where the wind direction is variable. The length and height of the net are determined according to factors such as the height of the bulk pile, and the number of rolling pulleys is determined according to actual needs. It is recommended to arrange a pair (front and rear of the net) every 30° opening angle.

Claims (5)

1. A dust-suppressing and wind-proof net that realizes adaptive wind direction adjustment is characterized in that: it comprises an arc-shaped dust-proof net, and a plurality of rolling pulleys are installed at the bottom of the arc-shaped dust-proof net. Two rolling pulleys are slidably connected on the circular track, and one end of the arc-shaped dust-proof net is provided with a motor, and the rotating shaft of the motor is respectively fixed to the roller shaft of a corresponding rolling pulley through the transmission structure. Connected so that the motor drives the rollers to move on a circular track. A wind direction sensor is installed in the center of the top of the arc-shaped dust-proof net or a wind direction sensor is installed symmetrically on the top of the arc-shaped dust-proof net. sensor, the windward side of the wind direction sensor and the tangential direction of the arc-shaped windproof net are arranged in parallel, the surface of the wind direction sensor can sense the wind direction of the incoming wind speed, and process the read wind direction change angle signal, and then Output the rotation angle signal to the drive motor to drive the rolling wheel to slide until the incoming wind received by the wind direction sensor is perpendicular to the sensor again. 2. The dust-suppressing and wind-proof net for self-adaptive wind direction adjustment according to claim 1, characterized in that: the central angle of the arc-shaped dust-proof net is 120°-240°. 3. The dust-suppressing and wind-proof net for self-adaptive wind direction adjustment according to claim 1 or 2, characterized in that the arc-shaped dust-proof net has a porosity of 40% to 50%. 4. The dust-suppressing and wind-proof net for self-adaptive wind direction adjustment according to claim 3, characterized in that the net height of the arc-shaped dust-proof net is 1.1 to 1.5 times the stacking height. 5. The dust-suppressing and wind-proof net for self-adaptive wind direction adjustment according to claim 4, characterized in that: the stacking distance of the arc-shaped dust-proof net is 1.0 to 1.5 times the stacking height.