Babcock and Wilcox Type E Vertical Grinding Mill Products
Expert Mill Upgrades and Parts for Efficient Operation
Ram Cylinders for Babcock and Wilcox Type E Vertical Grinding Mills
We supply upgraded Ram Cylinders and air bags as well as replacement bellows and seal kits for the hydraulic ram cylinders on Babcock and Wilcox Type E Vertical Grinding Mills. The most common of these are models 7.2, 8.5, 10.8, 10.9, 10.10, 12.0 and 12.9.
Upgraded Cylinders
Vertical grinding mill ram cylinder units perform a vital role in the operation of the pulverizer. They maintain a contact load and automatically compensate operational wear to ensure optimum performance. As the seals on the cylinder degrade the performance of the cylinder, and therefore the pulverizer, degrades making it less effective.
Why upgrade from Hydraulic Ram Cylinders to Pneumatic “Air Bag” type?
A hydraulic ram, no matter how good the sealing and maintenance, will always be wet. This means that any ingress of dust to the extended, exposed portion of the ram can adhere to the ram, allowing the possibility of grit being transported back into the front oil seal. The result is premature wear, and subsequent oil leakage.
The ram cylinders in a vertical grinding mill / pulverizer ensure the correct grinding pressure is exerted on the material being ground. Older, hydraulic cylinders use a sophisticated hydro-pneumatic control system, which provides lubrication to the ram bearing, as well as providing a balanced pressure characteristic to the oil/gas interface.
This becomes an environmental as well as a fire hazard.
Records obtained from various clients, show that repair frequencies on the older hydraulic type cylinders can vary between 9 and 18 months.
Comparative results, show an average life expectancy of 4 years between repairs for bag cylinders.
Another benefit of the pneumatic bag cylinder installation, is the fact that the larger effective operating area, achieved by the configuration of the bag cylinder itself, allows for lower operating pressures in the system, thus reducing the stresses in the pipe work, panel and other components.
Note: We have had instances of pneumatic cylinders working for 8 and even as many as 10 years without maintenance, although we admit that this is not the expected norm.
Large coal grinding mills have been identified as one of the main systems responsible for lost steam generation capacity of large coal fired utility boilers1.
EPRI study on large coal fired utility boilers (greater than 600MW) using grinding mills with capacities greater than 50 tons per hour.
Upgrading is easy!
The operation of the pneumatic cylinders is, to all intents and purposes, similar to that of the older hydraulic cylinders. It is simply a case of removing the old cylinders, the old pipe work and control cabinet, and replacing the bag cylinders, new pipe work and new control cabinet.
Connect with our Experts for Babcock and Wilcox Type E Vertical Grinding Mills
Please complete the form below, call us or click on the link to send us an email.
CHASE International Ltd
+44(0) 1925 755221