Dust is one of the main factors that affect the efficient, safe and clean production of the ore dressing plant. It not only pollutes the environment, but also causes a loss to the raw material itself, which is extremely harmful to the health of the surrounding residents and workers. It also accelerates the wear of the equipment and makes the product quality. Falling, when certain dust particles reach a certain concentration, it will cause explosion.
The composition of dust in a coal preparation plant is mainly composed of pulverized coal and other powders. The characteristics of the material belong to viscous materials. From the point of view of existence, dry dust and wet dust can be classified. Once the dry dust breaks down, it will result in two. Secondary pollution.
Analysis of Dust Producing Point in Coal Preparation Plant
Coal produces a lot of coal dust at the points of screening, crushing, and tape transfer. Due to the inability to clean the falling coal dust, the coal dust re-emerged twice more. From the specific processing procedures for coal preparation, it was said that the dust generated by handling, crushing, smashing, sifting, and cleaning was the most. The causes of serious system pollution are: Low coal moisture content (When the coal moisture content is less than 6%, the coal dust is very serious); there is no dust and dust removal equipment, dust can not be effectively controlled; transfer point, bridge floor And some health dead corners of coal accumulation, resulting in secondary dust flying; tape machine operation is not normal (runaway, tightly sealed) caused by serious coal tape. From the above analysis, it can be seen that the key to generating coal dust is the large amount of dust generated by coal falling at each transshipment point, followed by the screen, the dust spillover and transfer point of the crusher body, the ground of the trestle bridge and some coals with dead corners resulting in secondary dust flying.
In view of the source of dust, the coal preparation plant adds a cover plate and a dust curtain on the transfer chute of the tape conveyor head and the tail end to maximize the closure of the dust source; by cleaning the sanitary corners, opening the windows for ventilation, and spraying water to reduce dust Reduce the concentration of dust in the air. However, these measures can not reduce the dust concentration below the national standard of 10mg/m3, and the sprinkling of water to reduce dust has increased the treatment capacity of the slime water system, increased the moisture content of the product and affected the product specifications. Based on this, the coal preparation plant decided to use a dust collector to treat the dust.
Precipitators are mainly divided into mechanical dust collectors, filter dust collectors, wet dust collectors, and electrostatic precipitators. Among them, the bag filter in filter dust collector has the highest efficiency (above 99%). Although the mechanical dust collector is simple in structure, low in cost and convenient in maintenance, the dust removal efficiency is not high. The main disadvantage of wet scrubbers is the generation of sewage that needs to be treated to eliminate secondary pollution. Electrostatic precipitators are often used for dust removal in large power plants with high initial investment. Combined with the actual situation of the coal preparation plant, the air bag pulse bag filter is finally adopted, which features high dust removal efficiency (above 99.9%) and no secondary pollution. It is suitable for small and medium air volume dust removal.
"Five laws for prevention and control of coal dust in coal preparation plants."
1, dust suppression
It is a cost-effective method to reduce the content of fine particles that can be dusted in raw coal, or to directly prevent the occurrence of dusting. Such as improving the process; reduce the content of fine particles in the raw coal; use watering or adding a suitable Wetting Agent to improve the moisture of the incoming wool.
2. Falling dust
The direct spraying of a dust-laden air stream generated by a primary dusting action allows more than 90% of newly formed coal dust or dispersed floating coal dust to settle from the air. Compared with local ventilation and dust removal, this method has a low energy consumption and a simple system, but it has a lesser effect on the collection of fine dust, and on-site sanitary conditions are also affected.
3, dust removal
That is, the local ventilation and dust removal method is to control and purify the dust-laden airflow that has been generated by a dusting action to prevent diffusion. It uses various kinds of gas gathering hoods to collect the dust-laden air at the dust collection source and send it to the dust collector for purification and emptying.
4, dust
The adoption of effective airtight measures in coal handling systems and their process equipment is a good way to prevent coal dust from spilling. For example, when the volume of the underground slotted coal pit is calculated, no less than 20% of the backfill coal can be retained so as to avoid coal dust spillage due to unloading of the empty bucket; in order to prevent the raw coal in the bucket from flowing out through the slit of the coal slot, it may be in the gap The chain or rubber curtain is installed at the place; for the point where the coal flow falls more than 4m, the buffer gas lock can be installed at the appropriate position of the coal pipe. For the dust problem caused by coal mining during operation, corresponding measures can be taken according to the reasons for different coal spraying.
5, dust emission
Dust removal measures are taken to flush the dust that is scattered on the floor of the building and the coal conveying corridor in the production process, and at the same time to collect and treat the formed slime water.
Henan Zhengzhou Jienengda Environmental Protection Equipment Co., Ltd. specializes in producing various types of dust removal equipment, such as: various filter cartridge dust collectors, various series bag filter, dust removal and desulfurization integration technology, various dust removal accessories, etc., through years of accumulated experience and Continuous development and innovation There is a unique set of technologies for the application of bag filter, including the improvement of bag filter and the handling of some problems are all experienced. Users are welcome to inquire and order. We will work together with you to bring our environment together.
The composition of dust in a coal preparation plant is mainly composed of pulverized coal and other powders. The characteristics of the material belong to viscous materials. From the point of view of existence, dry dust and wet dust can be classified. Once the dry dust breaks down, it will result in two. Secondary pollution.
Analysis of Dust Producing Point in Coal Preparation Plant
Coal produces a lot of coal dust at the points of screening, crushing, and tape transfer. Due to the inability to clean the falling coal dust, the coal dust re-emerged twice more. From the specific processing procedures for coal preparation, it was said that the dust generated by handling, crushing, smashing, sifting, and cleaning was the most. The causes of serious system pollution are: Low coal moisture content (When the coal moisture content is less than 6%, the coal dust is very serious); there is no dust and dust removal equipment, dust can not be effectively controlled; transfer point, bridge floor And some health dead corners of coal accumulation, resulting in secondary dust flying; tape machine operation is not normal (runaway, tightly sealed) caused by serious coal tape. From the above analysis, it can be seen that the key to generating coal dust is the large amount of dust generated by coal falling at each transshipment point, followed by the screen, the dust spillover and transfer point of the crusher body, the ground of the trestle bridge and some coals with dead corners resulting in secondary dust flying.
In view of the source of dust, the coal preparation plant adds a cover plate and a dust curtain on the transfer chute of the tape conveyor head and the tail end to maximize the closure of the dust source; by cleaning the sanitary corners, opening the windows for ventilation, and spraying water to reduce dust Reduce the concentration of dust in the air. However, these measures can not reduce the dust concentration below the national standard of 10mg/m3, and the sprinkling of water to reduce dust has increased the treatment capacity of the slime water system, increased the moisture content of the product and affected the product specifications. Based on this, the coal preparation plant decided to use a dust collector to treat the dust.
Precipitators are mainly divided into mechanical dust collectors, filter dust collectors, wet dust collectors, and electrostatic precipitators. Among them, the bag filter in filter dust collector has the highest efficiency (above 99%). Although the mechanical dust collector is simple in structure, low in cost and convenient in maintenance, the dust removal efficiency is not high. The main disadvantage of wet scrubbers is the generation of sewage that needs to be treated to eliminate secondary pollution. Electrostatic precipitators are often used for dust removal in large power plants with high initial investment. Combined with the actual situation of the coal preparation plant, the air bag pulse bag filter is finally adopted, which features high dust removal efficiency (above 99.9%) and no secondary pollution. It is suitable for small and medium air volume dust removal.
"Five laws for prevention and control of coal dust in coal preparation plants."
1, dust suppression
It is a cost-effective method to reduce the content of fine particles that can be dusted in raw coal, or to directly prevent the occurrence of dusting. Such as improving the process; reduce the content of fine particles in the raw coal; use watering or adding a suitable Wetting Agent to improve the moisture of the incoming wool.
2. Falling dust
The direct spraying of a dust-laden air stream generated by a primary dusting action allows more than 90% of newly formed coal dust or dispersed floating coal dust to settle from the air. Compared with local ventilation and dust removal, this method has a low energy consumption and a simple system, but it has a lesser effect on the collection of fine dust, and on-site sanitary conditions are also affected.
3, dust removal
That is, the local ventilation and dust removal method is to control and purify the dust-laden airflow that has been generated by a dusting action to prevent diffusion. It uses various kinds of gas gathering hoods to collect the dust-laden air at the dust collection source and send it to the dust collector for purification and emptying.
4, dust
The adoption of effective airtight measures in coal handling systems and their process equipment is a good way to prevent coal dust from spilling. For example, when the volume of the underground slotted coal pit is calculated, no less than 20% of the backfill coal can be retained so as to avoid coal dust spillage due to unloading of the empty bucket; in order to prevent the raw coal in the bucket from flowing out through the slit of the coal slot, it may be in the gap The chain or rubber curtain is installed at the place; for the point where the coal flow falls more than 4m, the buffer gas lock can be installed at the appropriate position of the coal pipe. For the dust problem caused by coal mining during operation, corresponding measures can be taken according to the reasons for different coal spraying.
5, dust emission
Dust removal measures are taken to flush the dust that is scattered on the floor of the building and the coal conveying corridor in the production process, and at the same time to collect and treat the formed slime water.
Henan Zhengzhou Jienengda Environmental Protection Equipment Co., Ltd. specializes in producing various types of dust removal equipment, such as: various filter cartridge dust collectors, various series bag filter, dust removal and desulfurization integration technology, various dust removal accessories, etc., through years of accumulated experience and Continuous development and innovation There is a unique set of technologies for the application of bag filter, including the improvement of bag filter and the handling of some problems are all experienced. Users are welcome to inquire and order. We will work together with you to bring our environment together.
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