A Cold Model Aerodynamical Test of Air-Staged Combustion in a Tangential Firing Utility Boiler

作     者：ZHANG Hui-juan HUI Shi-en ZHOU Qu-lan 

作者机构：School of Energy and Power Engineering Xi＇an Jiaotong University Xi＇an 710049 P. R. China 

出 版 物：《International Journal of Plant Engineering and Management》 (国际设备工程与管理（英文版）)

年 卷 期：2007年第12卷第1期

页      面：36-41页

学科分类：080802[工学-电力系统及其自动化] 080703[工学-动力机械及工程] 0808[工学-电气工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：This paper is supported by National Natural Science Foundation of China under Grant No50476050 Natural Science Basic Research Plan in Shaanxi Province of China under Grant No2005E221 

主　　题：air-staged combustion concentric firing system cold model 

摘      要：The purpose of this paper is to present the flow field in the 300MW tangential firing utility boiler that used the Low NOx Concentric Firing System （LNCFS）. Using the method of cold isothermal simulation ensures the geometric and boundary condition similarity. At the same time the condition of self-modeling is met. The experimental results show that the mixture of primary air and secondary air becomes slower, the average turbulence magnitude the relative diameter of the tangential firing enlarges of the main combustion zone becomes less and when the secondary air deflection angle increases When the velocity pressure ratio of the secondary air to the primary air （p2/p1） enlarges, the mixture of the secondary air and the primary air becomes stronger, the average turbulence magnitude of the main combustion zone increases, and the relative diameter of the tangential firing becomes larger. Because the over fire air （OFA） laid out near the wall has a powerful penetration, the relative diameter of the tangential firing on the section of the OFA is very little, but the average turbulence magnitude is great. When the velocity pressure ratio of the OFA to the primary air POFA/p1 increases, the relative diameter of the tangential firing on the section of the OFA grows little, the average turbulence magnitude becomes larger and the penetration of the OFA becomes more powerful.