固定床中煤粉及煤焦燃烧NO排放特性研究

Study on Characteristics of NO Emission in Pulverized Coal and Char Combustion in Fixed Bed

利用自制恒温热重测量实验台,测量了800℃下,煤粉及煤焦燃烧NO排放特性。结果表明:NO排放大都集中于燃烧前半段,在燃烧后期NO的排放基本停止;煤粉热解处理时,热解温度越高,其热解后煤焦燃烧NO排放总量逐渐减少;对于同一煤种,高温区间内热解析出的挥发分,燃烧NO排放率大;800℃下,煤粉燃烧过程中,挥发分NO占整体NO排放量的比例大致低于1/2。

Based on the heat transfer characteristics of the oxygen-enriched combustion boiler＇s convective heat surface, this paper established a dynamic mathematical model for signal-phase heat exchanger pipe under the oxygenenriched combustion , and an algorithms-library being built on the platform of Matlab/Simulink software integrated with Cmex-S function and module packaging etc. The simulation tests for the reheated steam system of a 300 MW boiler were made respectively in air and O2/CO2 = 30/70 atmosphere under the 5% disturbance of steam entrance flow and flue-gas flow. The results show that the reheated steam temperature dynamic change trend under oxygenenriched atmosphere is similar with air atmosphere, but due to the different flue-gas properties, the dynamic response time under oxygen-enriched condition is cutting short, the study will take a important rule to the reheat sys- tem optimization design and operation control under the oxygen-enriched combustion atmosphere.