Three-dimensional Analysis of the Combustion and Fluid Flow in a Carbon Monoxide Boiler

• Main Authors: Guo-Tsai Jian, 簡國財
• Other Authors: Chun-Lang Yeh
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/an5m74

碩士 === 國立虎尾科技大學 === 航空與電子科技研究所 === 100 === Carbon Monoxide (CO) boiler plays an important role in the oil refinery process. It can retrieve the thermal energy of CO from the regenerator for application. CO boiler utilizes the burning gas (CO) from the regenerator as fuel. Then CO reacts form CO2 and release large amount of heat. The hot flue gas then flows through the superheater section and exchanges heat with water in the tubes to produce superheated steam which can be used by other equipments. The operating temperatures in a CO boiler can be as high as 1200℃. This can lead to the interior or exterior problems of a CO boiler. The loss caused by product loss of a CO boiler can be as high as one million US$ per day. Furthermore, the potential threats of safety and environment protection can not be ignored. In this study, the influences of refractory thickness, guide cone angle, inlet air flow rate and flue gas flow rate on the combustion and fluid flow as well as NOx formation in a CO boiler are discussed. From the simulation results, it is found that refractory thickening can reduce the temperature and the skin friction in the DeNOx section. Furthermore, the NOx formation is also alleviated by refractory thickening. Installation of a guide cone can reduce the temperature, the skin friction and the NOx formation in the DeNOx section. With higher air flow rate and lower flue gas flow rate, the temperature in the DeNOx section can be reduced. On the other hand, with lower air flow rate and flue gas flow rate, the skin friction in the DeNOx section can be reduced. Finally, with lower air flow rate and higher flue gas flow rate, the NOx formation and CO concentration can be alleviated.