| Customization: | Available |
|---|---|
| Type: | Cone Crusher |
| Motor Type: | AC Motor |
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Project Site: Gansu, China
Equipment: 1 LM220 Vertical Mill, dust collector, fan, nitrogen protection system, fire extinguishing device and intelligent centralized control device
Material: Coal Input Size: ≤40mm
Output Size: 200meshes (0.074mm), D80
Capacity:300,000TPY
On-site Photo
In 2016, a state-owned energy company in Gansu, Chian entered business relationship with SAINTWAH to build an efficient and clean coal powder preparation production line. The annual output is 300,000 tons. Currently, the project becomes the model of efficient coal powder industrial boilers in local and surrounding areas. This energy-saving and environment-friendly project is deemed to have a promising future.
Through years of research, the new clean coal produced by this company is of low cost, low dust, low sulfur content but high heat efficiency. The target of product for this project is the power-supply companies in the city and neighboring towns.
Since 2015, the air pollution has been a headache in northern China. Coal combustion deepens the environment pollution and damage of ecosystems because of a great deal of emission of dust, SO2 and nitric oxides. For coal combustion, both the thermal power plant and industrial coal-fired boiler are the two main application fields.
So, in 2015, China National Energy Bureau launched the Action Plan of Efficient& Clean Use of Coal (2015-2020) and required every province to boost the transformation and upgrading of industrial coal-fired boilers. Meanwhile, release and revise of some other related policies stipulated the responsibility of government on environment protection and punishments once there is some company trying to discharge pollutants at random.
In response to environmental protection, this customer has been adjusting its operation structure in recent years and started to march to the market of clean coal powder.
Efficient industrial coal powder boiler is the new energy saving technology which supported strongly by China. Based on the absorption of advanced foreign technologies, the efficient coal powder boiler has been developed by China Coal Research Institute. The new boiler can save coal by 30% and reduce dust emission by 95%. The emission of SO2 is one ninth of the national standard. The coal ash formed can be cycled as building material so that the problems of waste gas and residues can be avoided.
Considering the actual situations, we recommended our vertical mill to the customer. And the efficient coal powder preparation system we customized mainly consists of coal pre-homogenization system, coal conveying system, grinding system, hot-air system and anti-explosion system, etc.
To keep the quality of coal powder, the raw coal must be pre-homogenized first. When the raw coal is transported into the coal storage yard, earthmover is used to stratify the coal, achieving the effect of pre-homogenization.
Raw coal at the storage yard is sent into the storage bin of production plant along the underground hopper, vibrating feeder, conveyor belt and elevator. Under the coal storage bin, there is a weighing coal feeder and plunger valves. The raw coal is sent to mills after being weighed.
When the raw coal enters to the vertical mill, the hot air would enter into the mill, too. The material falls on to the center of grinding plate and under the action of eccentric force, the material starts to move towards the fringe of grinding plate evenly. When moving to the grinding roller bed, the bulky coal would be crushed by the grinding roller while the fine coal would form a material bed where fine coal crushes each other. The crushed material would move toward the fringe of the grinding plate continuously until it is blown away by the strong airflow. The larger particle falls to the grinding plate again for another grinding. The materials in the airflow would be divided into two parts under the rotor blade --- coarse particle falling to the grinding plate, the qualified fine material sent out from mill with the airflow.
In light of the characteristics of coal powder, the coal conveying system takes the dense phase transportation by using fluidizing transporter which can help reduce energy. The inert gas (N2) used in this system guarantees the safe and reliable operation.
Using coal powder as the fuel, the hot wind system can generate high heat efficiency but low operation costs, meeting customer's demand on energy reduction and environment protection.
Mill's air inlet and outlet, body and ash bucket of dust collector are monitored dynamically. Once the content and temperature of CO, O2 is beyond the set value, the fire extinguishing system works automatically to dilute content and lower temperature. If smoke or fire occurs, the system can start to put out the fire. This system integrates the monitoring, dilution and fire-proof protection, keeping safe operation.
Vertical mill is the ideal mill integrating crushing, drying, grinding, classification and conveying. The features are as follows:
The mill is characterized by simple structure but compact layout. Thus, the investment costs are reduced greatly.
The hot wind mixes with the powdery materials in the mill fully and repeatedly. By adjusting the temperature of hot wind, the materials can meet different demands on humidity.
The mill can be monitored and controlled remotely, which makes the operation easy.
The short longing time of materials inside the mill makes the monitoring and control of granularity and chemical components easier.
The maintenance tasks including checking oil cylinder, overturning the movable arms, replacing the roller covers and plates are easy. So the unnecessary costs brought by downtime can be avoided.
Slight vibration reduces noises; enclosed design ensures no fly powder.
With the rapid growth of coal powder boilers in Gansu province, the target market of coal powder products presents a tendency of increase by years. Because the quality of products is reliable and the future of this market is promising, the customer is confident to recover costs quickly and earn more money.
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