What are the dust prevention and dust reduction problems in dust control at the construction site?

1) Closed dustproof and dry dust removal.

Closed dust prevention and dry dust removal is to close the key dust-producing parts as much as possible, and at the same time assist some dust collection and dust removal devices and covering and compaction countermeasures, etc., which occupies a certain position in the dust prevention measures of China's port coal transit operation.

2) Wet dust removal.

Wet dust removal is mainly to spray water or chemicals on the dust source to increase the viscosity and weight of dust particles to eliminate or prevent dusting. The efficiency of wet dust collection is highly dependent on the amount of wine and the spraying device. Experience shows that a better spraying device can reduce respirable dust by about 30%, but its use is greatly limited for the northern coastal ports where fresh water resources are scarce and cold and frozen in winter.

In addition, wet dust removal also has the problem of secondary pollution of coal sewage and its disposal. Water as a dust-proof binder has only a temporary effect, and must be sprayed repeatedly at certain intervals, and natural meteorological conditions such as strong winds, evaporation, etc., often affect the sprinkling effect. Despite this, due to its low cost, simple and economical, and remarkable dust-proof effect, it has become the main technical means of dust prevention and dust removal in China's port coal transit operations.

3) Wind barriers such as windproof nets and dust suppression.

The windproof net dust suppression technology is a kind of wind barrier, which mainly reduces the wind speed and changes the airflow characteristics by setting up a windproof net in the upwind direction of the coal stockpile, so as to achieve the goal of reducing dust from the surface. Other wind barriers include windbreaks, green belts, artificially specific windbreak walls, etc.

In terms of coal dust control, many domestic coal mines have used spray dust reduction equipment, which has reached the national dust control standards, and the coal mine environment has taken on a new look. The high-pressure spray dust reduction equipment is based on the principle of high-pressure technology, which turns the water into mist water particles after spraying treatment, and quickly condenses with various dust particles floating in the air, so that the dust particles are aggravated and settled.

The spray dust suppression equipment of coal yard shed has the characteristics of large dust removal area, economy and practicality, and provides a good solution for dust control for construction, coal mines, power plants and other industries that produce serious dust.

On the one hand, the high-pressure spray dust removal system is equipped with an intelligent frequency conversion energy-saving system, so its energy consumption is much lower than that of other dust suppression systems. On the other hand, the high-pressure spray dust suppression equipment is well-equipped and has quality assurance, so it can be used for a long time and reduce the purchase cost of dust suppression equipment.

There are a variety of control systems inside the high-pressure spray dust reduction system, and customers can choose the appropriate way to spray dust reduction according to their needs. For example, dust control can be carried out through manual control on site; It can also remotely receive the dust situation through the PLC** monitoring and control system, so as to code and control the dust; In addition, through time control, the time of water mist opening and closing can be set in advance to achieve accurate dust control.

High-pressure spray dust removal equipment has the following characteristics:

1) Fine fog: The high-pressure spray nozzle can produce 5 billion fog droplets per second, and the diameter of the fog droplets is only 5 30 m, and the dust suppression effect is excellent.

2) Energy saving: Atomizing 1 kg of water only consumes 6w power, which is one-tenth of the soda mixed spray, and the efficiency is as high as 95%.

3) Reliable: The main engine of the high-pressure spray dust suppression system adopts imported industrial piston pump, which can run continuously for 24 hours.

4) Automatic pressure relief and drainage: When the sprayer stops working, the body automatically releases the pressure of the high-pressure nozzle to prevent the sprinkler from dripping, and can automatically force the discharge in winter.

5) Large coverage area: The pipeline conveying distance of a single high-pressure spray host can reach 150-180 meters, and each nozzle can cover 5-8 square meters.

6) Constant pressure water supply: The output flow rate of the pumping station of the high-pressure spray system is from 100kg h to 32400kg h, and the spray head can be arbitrarily configured within the flow range.

7) Water shortage protection: prevent the pump from running dry when there is no water, and improve the life of the pump.

8) Hygiene: The water of the high-pressure spray dust suppression system is sealed and non-recycled, which will not lead to the reproduction of bacteria.

<> dust reduction measures on the construction site are very important, the impact of dust on the construction site is not only the health of the construction personnel, but also the construction efficiency and quality, and the treatment of every detail is very important. Zhongda Consulting will introduce to you the dust reduction measures at the construction site.

1. Carry out hardening treatment on the on-site road, arrange a special person to be responsible for the on-site sprinkling work, and stipulate that the water is sprinkled three times a day in summer and twice a day in winter, and no water accumulation is required. In case of rain, stop sprinkling and clean up the stagnant water on the site.

2. Construction garbage must be transported to the garbage station in woven bags, and it is strictly forbidden to use the elevator shaft or throw garbage on the floor to the ground.

3. Cement and other fine-grained bulk materials that are easy to fly should be arranged to be stored in the warehouse or tightly covered. During transportation and loading and unloading, it is necessary to prevent spillage and flying.

4. When transporting cement and other fine-grained bulk materials and construction residue that are easy to fly, they must be closed, bandaged, covered, and must not leak or spill along the way.

5. A special person should be set up at the construction site to manage the transportation of vehicles and materials to prevent spillage. Before the earthwork transport vehicle drives out of the scene, the earthwork must be photographed, and the vehicle groove and wheels must be washed clean to prevent mud from being on the road and spilling.

6. For cleaning and decorating small machines and mortar mixers, the dust generated by the use of water should be sprinkled with water and dust reduction.

7. Enclose the construction site.

The measures for dust control and closure at the construction site are: the construction of the pure rolling field must be set up with a hard fence, and the height of the fence on both sides of the main road in the urban area is not less than meters, and the height of the general road section is not less than meters. The entrances and exits of the construction site and the main roads, processing areas, office areas, and living areas in the site must be hardened concrete, and the entrances and exits of the construction site must be equipped with vehicle washing facilities.

Article 68 of the Air Pollution Prevention and Control Law.

Local people at all levels should strengthen the management of construction and transportation, keep roads clean, control the stacking of materials and muck, expand the area of green space, water surface, wetland and ground pavement, and prevent and control dust pollution. Housing and urban-rural construction, city appearance and environmental sanitation, transportation, land and resources and other relevant departments shall, in accordance with the responsibilities determined by the people at the same level, do a good job in the prevention and control of dust pollution.

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Vehicles transporting coal, garbage, muck, sand, earthwork, mortar and other bulk and fluid materials shall take airtight or other measures to prevent dust pollution caused by the scattering of materials, and drive in accordance with the prescribed routes. Loading and unloading materials shall be closed or sprayed to prevent and control dust pollution. Urban people should strengthen the cleaning and cleaning management of roads, squares, parking lots and other public places, and promote low-dust operation methods such as mechanized cleaning of clean power to prevent and control dust pollution.