Monitoring of 2-D Combustion Temperature Images in a 670 t/h Utility Boiler and Simulation of its Application in Combustion Control
✍ Scribed by Zhou, H.-C. ;Zhang, S.-S. ;Huang, Y.-L. ;Zheng, C.-G.
- Publisher
- Curtin University of Technology
- Year
- 2008
- Tongue
- English
- Weight
- 564 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0969-1855
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✦ Synopsis
Abstract
A simple method of monitoring 2‐D temperature images from monochromatic gray images of flames captured from utility boilers, and reference temperatures measured by two‐color pyrometry, are presented in this paper. In a 670 t/h utility coal‐fired boiler furnace, the magnitude of the combustion temperature fluctuation can reach as high as 180 K under normal conditions. Furthermore, a two‐loop combustion control strategy was proposed with steam pressure as its outer‐loop control variable and the radiant energy signal as the inner‐loop control variable. Simulation on the single‐and two‐loop control strategies clearly indicates that the two‐loop control strategy can realize a more economical utilization of fuel. It also ensures steady steam pressure and safer conditions for the superheater surface tubes (not to be overheated) making the boiler respond quickly to the load change.