Technical Overview of Recent and Ongoing Developments

1999 Conference on Unburned Carbon in Fly Ash

William Ellison ; Fred E. Preik

Others  :  http://www.netl.doe.gov/publications/proceedings/99/99flyash/ellison.pdf
PID  :  47774

来源: CEUR

【 摘 要 】

Excessive unburned carbon (UBC) loss in boiler operations is largely the result of the mandating of low-NOx burner retrofits so as to lower primary NOx emissions. But industry deregulation will bring unrelenting competitive pressure for lower busbar costs and will lead increasingly to corrective actions so as to be achieved with cost-effective monetary and manpower outlay! This challenge is spawning numerous and diverse new developments in application of hardware, the "bricks and mortar" of the power generation business …. and in use of advanced process control methodologies. Moreover, the press for controlling UBC is resulting in a “raising of the bar” in effective management of boiler operations and maintenance activities. An example is the narrowing of tolerable ranges for inter and intra-burner coal and air and fuel flow balancing and in mechanical tolerancing of the equipment components that play a part in this difficult to maintain flow balance. The uniqueness of each operational aspect must be understood, and this includes the hardware of the combustion system as well as feasible control opportunities– and the human factors – in devising and implementing the best mix of abatement measures for each unit.