Raw material field (workshop) is one of the pollution sources of iron and steel plant, but also one of the environmental protection management difficulties in iron and steel enterprises, its main pollutant is dust produced in the production process.

Dust with an original mass concentration of 5-15 g/m3 will be produced in the process of raw material unloading, stacking and retaking, open-air stock yard, screening, mixing and mixing, and transportation. When no control measures are taken, dust is mostly disorganized discharge, causing quite serious pollution to the surrounding environment.

 

 

 

 

 

At present, the bulk materials of many iron and steel enterprises are transported by train. When the materials are transported into the enterprise material yard by train, they are generally unloaded by dumper. Therefore, the dumper room is taken as an example.

In the process of turning over, a lot of dust is produced, which causes environmental pollution and serious deterioration of workers' working environment.
 

Traditional dust removal and dry fog dust suppression techniques are used in the unloading process of dumper.
 

The traditional dust removal is mainly dry dust removal and wet dust removal two categories, dry dust removal (negative pressure dust removal) including cyclone dust removal, bag dust removal, electrostatic dust removal;
 

Wet dust removal includes cleaning tower dust removal, negative pressure dust removal), spray dust removal, agent dust removal.

 

 

The principle of dry fog dust suppression is that when the size of water fog particles is similar to that of dust particles, dust particles will collide, adsorb and condense with water fog particles along with the movement of air flow, and the dust group formed will fall under the action of gravity, so as to achieve the purpose of filtering dust.
 

Dry fog dust suppression device is characterized by the introduction of spray dust suppression technology widely used in Europe and The United States to save energy and reduce emissions, dust suppression rate ≥ 90%;

Using the principle of dust condensation, the suspended dust in the air, especially the diameter of inhalable dust under 5 μm, has a strong ability to inhibit, so that the dust condensation, and settling under the action of its own gravity, so as to achieve dust suppression;

The equipment adopts high-tech sprayer, can produce micron level dry fog, nozzle is not blocked, and has self-cleaning function;

It can produce fog drops with a diameter of 80 μm.Can use clear or medium water;

 

With heat preservation and anti-freezing measures to ensure that the equipment can be used normally in winter;

Less investment, easy operation, full automatic control, small footprint, small water consumption, low operating cost;

Product dust suppression ability is strong, no secondary pollution;

The water content of material hardly increases.

 

 

 

 

 

The main work of the storage yard of iron and steel enterprises is to be responsible for the concentration of raw fuel into the plant, storage and management, and responsible for part of the user's inter-plant raw fuel transport and iron and steel production part of the consumption of iron containing waste, is the raw fuel logistics management center of iron and steel enterprises.

The main storage materials are ore raw materials (ore powder).

The bulk materials stacked in the storage yard have the following characteristics: covers an area of large amount of accumulation;

The material particle size distribution is relatively broad, which contains a lot of dust easily raised by the wind;

A lot of powder is produced under the action of wind

 

Dust, its harm area is wide, serious pollution to the environment, and cause a lot of material loss, many ore dust mineral content is very high, 10% of the dust is actually equivalent to 20%, or even higher, material loss can generally reach 3% of the total amount of material stacking;

Dust spot is a large area, it is difficult to comprehensively collect the dust raised, difficult to control.

The key of environmental protection measures for storage yard is to take dust suppression measures for the dust generated in storage yard. According to the dust classification and movement characteristics, the dust of 150μm or so can easily account for 10% of the total dust generated.

 

Therefore, the main object of dust control in storage yard is the dust particles below 150 μm.

In particular, the diameter of inhalable dust particles below 10 μm, although it accounts for less than 1% of the total material, but it is very harmful to the human body, is the main source of occupational diseases such as silicosis, a serious threat to human health and life.

 

At present, our country into the iron and steel industry is given priority to with the structural adjustment stage of development, adhere to environmental protection, implement the policy of paying equal attention to pollution control and ecological protection, in line with the clean production of using new craft, new technology and large-scale, continuous and efficient equipment, can reduce consumption of information and resources from the sources, each production working procedure is equipped with complete environmental protection facilities, collect pollutants effectively,

Minimize pollutant emissions to achieve enterprise and environmental friendliness.
 

The effect of pollution prevention in steel production is far better than that of end pollution control.
 

The traditional end treatment method is extended to the source implementation of clean production technology, combined with the adoption of end pollution treatment measures to reduce the flow of raw materials and energy into the production process, thus reducing the generation, discharge and treatment of waste, to achieve "less investment, low pollution and high benefit.
 

At the same time, it can also achieve a blue sky and the purpose of designing a clean raw material field.