Coal vertical mills are designed to achieve the maximum rated capacity grinding a design coal with a grindability of 55 HGI and 8-12 percent moisture and achieving a discharge fineness of 70 per cent passing a 200 mesh screen (74 micron) and 99.5 per cent passing a 50 mesh screen. Variation of the coal hardness and/or moisture content will effect, up or down, the discharge capacity or the discharge fineness.
To achieve these design considerations it is essential that the grinding elements are in good condition and they maintain a consistent profile. The loss of the grinding profile results in a loss of grinding efficiency, meaning the pulveriser must work harder to achieve an equal result.
Ultimately a point will be reached in which either a loss of capacity or a loss of fineness will result under uniform conditions. Longer lasting, more consistent grinding elements are crucial to pulveriser operation yielding longer operating campaigns, reduced maintenance and a lower overall invested cost.
1. Force-Feed Lubrication. System Force-feed lubrication system extends the service life of bearing by 2.5 times.
2. Maximum Particle Fineness. Traditional roller mill either uses a static separator or dynamic separator to separate fine powder from coarse particles.Vertical coal mill brings together both types of separators for more efficient, adjustable material separation.
3. 20-40% Electricity Savings. Vertical coal mill uses 20% to 40% less electricity than a traditional air-swept ball mill for the same amount of grinding task.
4. Great Drying Performance. Air-swept milling method allows our mill to handle coals of up to 10% moisture content via varying its air flow rate and temperature.
|ZKRM Specification and technical parameter of pulverized coal vertical mill|
|Model||Capacity (t/h)||Geometric diameter of grinding disc (mm)||Grinding disc track diameter(mm)||Feeding size(mm)||Raw coal moisture(%)||Coal fineness(%.R0.08)||Moisture of pulverized coal(%)||main motor power(kW)|
Remarks: Raw coal hastelloy coefficient 50-90