Abstract A new technique to preheat pulverized coal in a circulating fluidized bed was adopted. This technique consists of two stages: the pulverized coal is first self-preheated in a circulating fluidized bed, and then the preheated fuel gas and char particles are burned out in a down-fired combustor under air-staging conditions. Experiments were conducted with two types of coals, two air ratios in the circulating fluidized bed and different air distributions in the combustor. The preheating and combustion processes ran stably under all experimental conditions. For both types of coals, the preheating temperatures in the circulating fluidized bed could be adjusted broadly within 800–950 °C, and the ratios of primary air could be lowered to 0.15. The combustion efficiency and nitrogen conversion were remarkably influenced by the air distribution, and were controlled above 98% and below 10% respectively, although the two targets could not be simultaneously achieved.

中文翻译：

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循环流化床预热煤粉燃烧特性试验研究

摘要 采用循环流化床预热煤粉新技术。该技术包括两个阶段：煤粉首先在循环流化床中自预热，然后预热的燃气和炭颗粒在空气分级条件下在下燃燃烧器中燃烧。使用两种煤、循环流化床中的两种空气比和燃烧器中的不同空气分布进行了实验。预热和燃烧过程在所有实验条件下运行稳定。对于这两种煤，循环流化床预热温度可在800-950℃范围内大范围调整，一次风比可降低到0.15。燃烧效率和氮转化受空气分布的显着影响，