There are many high-dust operation sites in coal preparation plants, and in the process of crushing, conveying, stacking and processing, the materials move relative to the air, resulting in fine particles flying into the air and forming dust. These dusts have a negative impact on the environment and human health, so coal preparation plants need to take a series of dust removal measures. The following are some common dust removal measures in each link of coal plants:
1. Dust removal of raw coal bunker
The raw coal bunker is generally located in a higher position, the drop is larger, and the raw coal enters from the silo, and the amount of dust generated by impact crushing during the falling process and after falling is larger. Most coal preparation plants are equipped with air cannons at the mouth of the raw coal bunker, and due to the rapid ejection of air cannon gas in use, the coal dust flies seriously, and the dust rises from the bottom to the silo, resulting in a large concentration of coal dust on the raw coal bunker, and a large amount of dust will be produced when the raw coal is discharged from the silo, so it is necessary to install the spray dust removal equipment of the Jiujiu cloud environment when feeding coal under the silo, such as intelligent fog cannon or dry fog dust suppression system.
2. Dust removal from the crusher
The method of dust removal of the crusher is to close the crusher, control the source of the dust, install a dust collector and water spray device, and clean and collect coal dust in time. After that, the dust is discharged by a dust removal fan. The substructure of the crusher will carry some air into the coal chute because of the fall of the coal, which will form a high wind pressure at the outlet, so that the dust will gush out quickly.
3. Dust removal of belt conveyor
Causes of dust in belt conveyor: on the one hand, the main reason is that the working face of the raw coal belt is not completely scraped under the action of the cleaner, resulting in the coal sticking to the working face, and the friction between the sticky coal and the roller leads to the generation of dustOn the other hand, when the instantaneous large flow of the coal conveying tape or the belt deviates, and the skin of the guard plate has problems, it will also cause some materials to spill.
The dust control of belt conveyor should strengthen the maintenance of the conveyor cleaner to reduce the coal sticking on the conveyor working face, so as to reduce the amount of dust generated by the friction between the coal sticking on the conveyor working face and the idlerA sealing device is installed at the coal falling point at the tail of the conveyor, and the buffer bed is used instead of the triple idler to reduce the vibration caused by the coal falling in the tail chute of the conveyor and prevent the coal dust from escapingStrengthen the maintenance of the roller to prevent serious eccentricity due to the non-rotation of the roller or the uneven wear of the rubber surface, resulting in continuous and rapid vibration of the belt in operationDust the conveyor frame regularly.
4. Dust removal of plant and equipment
Coal preparation plant equipment maintenance is not in place and the efficiency of dust removal facilities is low, will cause serious dust accumulation of plant and equipment, the secondary dust formed under the action of equipment vibration and related impact airflow further increases the dust pollution, so it is very important to control the secondary dust in dust control, and the dust must be cleaned up regularly, and the method of regularly washing the dust parts of the plant and cleaning the equipment can be used to reduce the dust accumulation.