Fly ash is the fine ash collected from the flue gas after coal combustion. Fly ash is the main solid waste discharged from coal-fired power plants. If a large amount of fly ash is not treated, it will produce dust and pollute the atmosphere.
The fly ash processing system is composed of dryer, elevator, silo, grinding mill, fan, powder concentrator, dust collector, pipeline device, etc. The system structure is simple, the layout is compact, the process is smooth, and the negative pressure and closed cycle are used to avoid secondary pollution.
Process flow
The fly ash grinding process can be divided into open circuit and closed circuit systems.
Open circuit grinding process
The system takes the ash from the coarse ash silo, and after it is measured by the spiral electronic scale, the coarse ash is continuously and stably fed into the grinding mill by the elevator. The coarse ash fed into the mill is directly ground into Grade I and Grade II ash with fineness meeting the standard, without further screening or separation. The finished products from the mill are stored in the finished product ash silo.
Closed circuit grinding process
The grinding system feeds materials from the raw material warehouse. After quantitative feeding and metering by the speed regulating electronic belt weigher, the fly ash is fed by the elevator to the grinding mill for sorting, and the sorted fine ash enters the fine ash warehouse while the coarse ash is sent to the mill by the air conveyor for grinding. The pulverized fine powder is fed to the separator by the original ash elevator for separation, and then the pulverized fine powder is separated in the separator. The fine powder selected by the powder concentrator enters the fine ash silo, and the coarse powder is reground to form a loop flow mill system.
Fly ash grinding process
The fly ash processing system can be divided into the coal ash sorting system and grinding system.
In the sorting system, the coal ash is sorted by the separator to separate the qualified pulverized coal and large particles in the coal ash; in the grinding system, the grinding mill grind coarse fly ash into qualified fine powder.
According to different application fields of fly ash, fly ash processing equipment can be configured with different production processes:
Front stage
Raw material storage: the fly ash raw materials in the flue gas of the power plant are collected by the electrostatic dust collector or the pulse dust collector and transported to the powder tank for storage.
Grinding stage
The fly ash in the powder tank is sent to the fly ash grinding mill through the electromagnetic vibration feeder for grinding.
Collecting stage
The fine pulverized fly ash is collected by the dust collector and dust collecting device.
Finished product transportation stage
The collected finished products are sent to the downstream or finished product warehouse, and then the finished products are loaded and transported.
Features of fly ash grinding process
1, The fineness of finished fly ash is fine, which is a new type of grinding;
2, By adopting open flow production process, which can reach the fineness of commercial ash without further sorting;
3, The silo pump or jet pump can be used for conveying fly ash in and out of the mill. The layout is flexible and convenient. The fine ash silo is far away from the mill workshop and can also realize barrier free conveying;
4, Each dust raising point is equipped with a bag dust collector, which will not produce secondary pollution;
5, High automation of production management;
6, Compared with traditional cement grinding system, this system has high equipment configuration and more reliable operation;
7, Large production capacity.
The fly ash processing system is composed of dryer, elevator, silo, grinding mill, fan, powder concentrator, dust collector, pipeline device, etc. The system structure is simple, the layout is compact, the process is smooth, and the negative pressure and closed cycle are used to avoid secondary pollution.
Process flow
The fly ash grinding process can be divided into open circuit and closed circuit systems.
Open circuit grinding process
The system takes the ash from the coarse ash silo, and after it is measured by the spiral electronic scale, the coarse ash is continuously and stably fed into the grinding mill by the elevator. The coarse ash fed into the mill is directly ground into Grade I and Grade II ash with fineness meeting the standard, without further screening or separation. The finished products from the mill are stored in the finished product ash silo.
Closed circuit grinding process
The grinding system feeds materials from the raw material warehouse. After quantitative feeding and metering by the speed regulating electronic belt weigher, the fly ash is fed by the elevator to the grinding mill for sorting, and the sorted fine ash enters the fine ash warehouse while the coarse ash is sent to the mill by the air conveyor for grinding. The pulverized fine powder is fed to the separator by the original ash elevator for separation, and then the pulverized fine powder is separated in the separator. The fine powder selected by the powder concentrator enters the fine ash silo, and the coarse powder is reground to form a loop flow mill system.
Fly ash grinding process
The fly ash processing system can be divided into the coal ash sorting system and grinding system.
In the sorting system, the coal ash is sorted by the separator to separate the qualified pulverized coal and large particles in the coal ash; in the grinding system, the grinding mill grind coarse fly ash into qualified fine powder.
According to different application fields of fly ash, fly ash processing equipment can be configured with different production processes:
Front stage
Raw material storage: the fly ash raw materials in the flue gas of the power plant are collected by the electrostatic dust collector or the pulse dust collector and transported to the powder tank for storage.
Grinding stage
The fly ash in the powder tank is sent to the fly ash grinding mill through the electromagnetic vibration feeder for grinding.
Collecting stage
The fine pulverized fly ash is collected by the dust collector and dust collecting device.
Finished product transportation stage
The collected finished products are sent to the downstream or finished product warehouse, and then the finished products are loaded and transported.
Features of fly ash grinding process
1, The fineness of finished fly ash is fine, which is a new type of grinding;
2, By adopting open flow production process, which can reach the fineness of commercial ash without further sorting;
3, The silo pump or jet pump can be used for conveying fly ash in and out of the mill. The layout is flexible and convenient. The fine ash silo is far away from the mill workshop and can also realize barrier free conveying;
4, Each dust raising point is equipped with a bag dust collector, which will not produce secondary pollution;
5, High automation of production management;
6, Compared with traditional cement grinding system, this system has high equipment configuration and more reliable operation;
7, Large production capacity.
