循环流化床二段燃烧燃煤过程中NO和N_2O生成与控制研究

Study on Formation and Control of NO and N 2O during Coal Two Stage Combustion in CFB

在小型石英循环流化床燃煤装置上，进行ＮＯ和Ｎ２Ｏ生成与控制研究。研究结果表明：随着二次空气率的提高，ＮＯ明显下降，二次风口的位置高，ＮＯ的下降速率明显一些；随着二次空气率的提高，Ｎ２Ｏ开始升高，但升高到一定程度后，随着二次空气率的提高，反而开始下降。此外，二次风口的位置高，Ｎ２Ｏ随二次风变化曲线的上升段和下降段的斜率都略大。

Mechanism study of formation and control of nitric oxide (NO) and nitrous oxide (N 2O) during coal two stage combustion was made on a bench scale circulating fluidized bed (CFB). The experiment results show that: 1) NO emission decreases quickly with the second air ratio rising; when the position of second is higher, NO emission is lower. 2)With the second air ratio rising, N 2O emission distinctly increases until a flex point; then with the second air ratio rising again, N 2O emission decreases quickly; when the position of second air is higher, the rate of N 2O concentration up and down is higher.