The required particle size of limestone powder for desulfurization is 250 mesh or 325 mesh (45μm) The desulfurization effect of 325 mesh limestone powder is better.
To prepare such fine limestone powder, basically, the mill mainly adopts Raymond Mill (pendulum mill), suspension roller mill, ball mill or European version mill.
In the past, Raymond mill, suspension roller mill and ball mill were widely used. In recent years, with the improvement of the requirements for the fineness of limestone powder and the needs of energy conservation and emission reduction, more and more power plants began to adopt the European version of mill for desulfurization and preparation of limestone powder.
MTW European grinding machine is a new type of grinding equipment developed by SMMVIK Machinery machine by absorbing European grinding technology and concept. This machine adopts many new technologies, such as bevel gear integral transmission, internal thin oil lubrication system, arc air duct, etc. Stable performance, easy operation and low energy consumption; Adjustable and controllable particle size of finished products and widely used for grinding materials; Equipped with a special dust collector, the dust emission concentration is lower than the national environmental protection regulations. At present, it has been widely used in desulfurization limestone pulverization projects of many subordinate home appliance plants such as Guodian, Huadian, Huaneng, Datang, etc.
Process flow for preparing limestone powder by European plate mill:
The pulverizing system generally includes equipment: crusher, elevator, electromagnetic vibrating feeder, European version pulverizer.As the European version mill is equipped with a powder concentrator inside, there is no need for an external powder concentrator, which makes the process simple.
After the massive limestone is crushed to the required particle size by the jaw crusher, it is sent to the storage hopper by the hoist, and then sent to the main machine grinding room of the European version mill for grinding by the vibrating feeder. The ground limestone powder is blown up by the wind and graded by the powder concentrator, limestone powder conforming to the fineness will flow through the pipeline with the gas and enter the new isolated cyclone powder collector for separation and collection. The collected limestone powder finished product is sent to the limestone powder silo through the discharge port and the conveying device for desulfurization. The unqualified particles are thrown to the cylinder wall after being separated by the powder concentrator, and then fall along the cylinder wall and return to the mill for grinding. The whole system operates under negative pressure, and the system dust does not overflow, so as to ensure the cleanness of the site.
