Disclosed are exemplary method and system for manufacturing cement in a vertical roller mill (VRM) using humidity sensor readings. This enables adjustment of operational variables such as material feed, water, grinding additives, air flow, temperature, and their combinations. Exemplary embodiments allow manufacturers to predict and to improve cement properties, such as strength and setting time, by monitoring and managing humidity of air in the VRM and/or its air flow system.

The object of the is A fine grinding apparatus and a method for grinding granular material includes a grinding plate rotating on the horizontal plane around a vertical rotation axis, onto the top surface of which grinding plate the material to be ground can be fed, and on the top surface (of which grinding plate is a plurality of grinding discs, which rotate from the effect of the rotating motion of the grinding plate and compress the material to be ground against the grinding plate. The apparatus has one or more refiner elements pressing against the top surface of the grinding plate and rotatable around their vertical center axes, by means of which elements the material to be ground is kneaded on the top surface of the grinding plate.

An enhanced retractable flow discharge extension is configured for use in a coal pulverizer having a classifier system including a feedpipe to deliver from above raw coal to a pulverizing structure and a classifier cone positioned around the feedpipe to collect oversized coal for the pulverizing structure. The enhanced retractable flow discharge extension is configured to deliver oversized coal to the pulverizing structure and has a conical extension portion having an inlet end configured to be contiguous with the classifier cone outlet, a fixed cylindrical portion having an upper end contiguous with an outlet end of the conical extension portion, a movable cylindrical portion having a circumference larger than a circumference of the fixed cylindrical portion, the movable cylindrical portion being movably attached to the fixed cylindrical portion, and a distal portion movably attached to the movable cylindrical portion, the distal portion having a straight portion and a tapered portion.

A vertical roller mill comprising a grinding table and a grinding roller having a rotational axis, each having a grinding surface and arranged to define a grinding zone between the grinding surfaces grinds particulate material. A feeder feeds the particulate material to the vertical roller mill, with the grinding roller arranged to roll around a grinding path on said grinding table. The feeder receives a supply of the particulate material and directs that material to flow to the grinding zone of the vertical roller mill. The feeder can constrain the flow of material to a defined cross-section by applying a momentum to and/or pushing, or to compact the flow of material prior to directing the material, or combinations thereof. In particular, the disclosure is applicable to grinding particulate materials like mining ores, industrial minerals and chemicals, sand, slag, ash, clay, pigments for coatings, pharmaceuticals and cement raw materials.

Disclosed are exemplary method and system for manufacturing cement in a vertical roller mill (VRM) using humidity sensor readings. This enables adjustment of operational variables such as material feed, water, grinding additives, air flow, temperature, and their combinations. Exemplary embodiments allow manufacturers to predict and to improve cement properties, such as strength and setting time, by monitoring and managing humidity of air in the VRM and/or its air flow system.