We have developed new technologies to improve particle classification performance of vertical roller mills using a rotary nozzle ring with reverse swirling flow and a louver separator. A rotary nozzle and a louver are installed in primary and secondary classification sections of the mill, respectively. A series of tests using a pilot scale mill showed that these technologies reduce the fraction of coarse particles, power consumption of the mill and mill differential pressure. For an industrial scale-up, we conducted a demonstration test using a vertical roller mill equipped in a 700MW thermal power plant consisting of a pulverized coal firing boiler and six mills with approx. 70t/h nominal grinding capacity in each. In this paper, we discuss demonstration test results on the viewpoint of decreasing coarse particle fractions, power consumption and mill differential pressure. Under normal operating conditions, the coarse particle fraction in pulverized coal was reduced more than 50%, power consumption was reduced 7% and differential pressure was reduced approx. 50%. Additionally, power consumption was reduced approx. 15% under high coal feed conditions. We confirmed that these new technologies effectively improved performance in higher mill loading rates. These results provide a prospect of upgrading the plant performance, especially in reducing unburned carbon in fly ash and power consumption of auxiliary equipment.
Skip Nav Destination
ASME 2011 Power Conference collocated with JSME ICOPE 2011
July 12–14, 2011
Denver, Colorado, USA
Conference Sponsors:
- Power Division
ISBN:
978-0-7918-4459-5
PROCEEDINGS PAPER
A Demonstration Study on a High Performance Vertical Roller Mill for a Pulverized Coal Firing Boiler
Yutaka Takeno,
Yutaka Takeno
Babcock-Hitachi K.K., Kure, Hiroshima, Japan
Search for other works by this author on:
Hiroaki Kanemoto,
Hiroaki Kanemoto
Babcock-Hitachi K.K., Kure, Hiroshima, Japan
Search for other works by this author on:
Hideo Mitsui
Hideo Mitsui
Babcock-Hitachi K.K., Kure, Hiroshima, Japan
Search for other works by this author on:
Yutaka Takeno
Babcock-Hitachi K.K., Kure, Hiroshima, Japan
Hiroaki Kanemoto
Babcock-Hitachi K.K., Kure, Hiroshima, Japan
Hideo Mitsui
Babcock-Hitachi K.K., Kure, Hiroshima, Japan
Paper No:
POWER2011-55365, pp. 125-130; 6 pages
Published Online:
February 28, 2012
Citation
Takeno, Y, Kanemoto, H, & Mitsui, H. "A Demonstration Study on a High Performance Vertical Roller Mill for a Pulverized Coal Firing Boiler." Proceedings of the ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASME 2011 Power Conference, Volume 1. Denver, Colorado, USA. July 12–14, 2011. pp. 125-130. ASME. https://doi.org/10.1115/POWER2011-55365
Download citation file:
11
Views
Related Proceedings Papers
Related Articles
The Combusting Properties of Anthracite in a 410 t/h CFB Boiler
J. Energy Resour. Technol (September,2004)
The Performance of a Compact Oil-Designed Utility Boiler When Firing Coal-Water Fuel
J. Eng. Gas Turbines Power (January,1990)
On-Line Determination of Unburned Carbon in Airborne Fly Ash
J. Eng. Gas Turbines Power (October,1990)
Related Chapters
Combined Cycle Power Plant
Energy and Power Generation Handbook: Established and Emerging Technologies
The Context of Thermal Power Plant Water Usage
Thermal Power Plant Cooling: Context and Engineering
Development of Nuclear Boiler and Pressure Vessels in Taiwan
Companion Guide to the ASME Boiler and Pressure Vessel Code, Volume 3, Third Edition