Vertical roller mill and method for operating a vertical roller mill

Patent metadata

Field	Value
Publication number	US-9643188-B2
Application number	US-201314380684-A
Country	US
Kind code	B2
Filing date	Jan 22, 2013
Priority date	Feb 24, 2012
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

The invention relates to a vertical roller mill and a method for operating a vertical roller mill, wherein the grinding assemblies thereof, consisting of a grinding table and at least one grinding roller, interact such that material to be ground is comminuted in the grinding bed between the grinding table and the at least one grinding roller, wherein at least one grinding assembly is driven and at least one grinding assembly is pulled, and the pulled grinding assembly is braked in order to increase the flow of energy through the grinding bed between the grinding table and the at least one grinding roller.

First claim

The invention claimed is:

1. A method of operating a vertical roller mill having a grinding plate and at least one grinding roller that are together configured to comminute material-to-be-ground by grinding the material there between, wherein the grinding plate is a grinding assembly and the at least one grinding roller is a grinding assembly, wherein one of the grinding assemblies is driven and another of the grinding assemblies is trailed, the method comprising:
conveying the material-to-be-ground onto the grinding plate of the vertical roller mill to form a grinding bed of the material-to-be-ground;
driving the driven grinding assembly so as to move the grinding bed between the grinding plate and the at least one grinding roller and comminute the material-to-be-ground in the grinding bed;
braking the trailed grinding assembly to effect an increase in an amount of slippage between the grinding plate and the at least one grinding roller, and an increase in a flow of energy and shear load through the grinding bed between the grinding plate and the at least one grinding roller.

2. The method of claim 1 , wherein the at least one grinding roller is the grinding assembly that is driven and the grinding plate is the grinding assembly that is braked.

3. The method of claim 1 , wherein the grinding plate is the grinding assembly that is driven and the at least one grinding roller is the grinding assembly that is braked.

4. The method of claim 1 , further comprising generating energy from said braking step to be used in said driving the driven grinding assembly.

5. The method of claim 1 , wherein the flow of energy through the grinding bed is regulated in a prespecified range by an amount of slippage occurring between the grinding plate and the at least one grinding roller.

6. The method of claim 5 , further comprising determining a rotational speed of the trailed grinding assembly that is braked so as to regulate the amount of slippage between the grinding plate and the at least one grinding roller.

7. The method of claim 5 , wherein the amount of slippage between the grinding plate and the at least one grinding roller is regulated in a range of about 3% to about 10%.

8. The method of claim 5 , wherein the amount of slippage between the grinding plate and the at least one grinding roller is regulated based on the fines content of the comminuted material to be ground.

9. The method of claim 5 , wherein the amount of slippage occurring between the grinding plate and the at least one grinding roller is increased by between 15% and 100%, as compared to an amount of slippage occurring in a trailed grinding assembly that is not braked.

10. A vertical roller mill comprising:
a grinding plate, wherein the grinding plate is a grinding assembly;
a grinding roller disposed opposite the grinding plate and defining a grinding bed disposed there between, wherein the grinding roller is a grinding assembly, the grinding plate and the grinding roller being configured to comminute material-to-be-ground that passes between said grinding plate and said grinding roller in the grinding bed, wherein one of the grinding assemblies is driven and another of the grinding assemblies is trailed;
a drive unit connected to and configured to drive the driven grinding assembly; and
a brake unit connected to and configured to brake the trailed grinding assembly so as to increase a flow of energy through the grinding bed between said grinding plate and the grinding roller.

11. The vertical roller mill of claim 10 , wherein said drive unit is in communication with said grinding roller and configured to drive said grinding roller, and wherein said brake unit is in communication with said grinding plate and configured to brake said grinding plate with respect to said grinding bed and said driven grinding roller.

12. The vertical roller mill of claim 10 , wherein said drive unit is in communication with said grinding plate and configured to drive said grinding plate, and wherein said brake unit is in communication with said grinding roller and configured to brake said grinding roller with respect to said grinding bed and said driven grinding plate.

13. The vertical roller mill of claim 10 , wherein said brake unit is formed by a generator.

14. The vertical roller mill of claim 10 , further comprising a regulator unit for regulating the slippage between said grinding plate and said grinding roller in a prespecified range.

Assignees

• Thyssenkrupp Resource Tech Gmbh
• Thyssenkrupp Ind Solutions Ag

Inventors

• Berger Markus

Classifications

• B02C15/14 Primary

  Edge runners, e.g. Chile mills · CPC title

• B02C15/00 Primary

  Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs {(high-speed drum mills B02C19/11)} · CPC title

• B02C15/006

  Ring or disc drive gear arrangement · CPC title