Oxy-fuel combustion in pulverized coal (PC) and fluidized bed (FB) boilers is being increasingly investigated due to its potential use for carbon dioxide capture. The combustion conditions in the two types of unit differ significantly because of fuel size, furnace temperature, and fluid dynamics. These differences affect the change of combustion characteristics from air (O₂/N₂) to oxy-fuel (O₂/CO₂) conditions in PC and FB in different ways. In this paper, the oxy-fuel combustion behavior of a single sub-bituminous coal particle in PC is compared with that in FB conditions. The FB data were measured in our bench-scale FB test rig, whereas the PC data were collected from literature. The FB tests were performed at 1088 K with 0%_vol < O₂ < 40%_vol, using sub-bituminous coal with a diameter of 6 mm. An extensive list of parameters is compared, including the ignition-delay time, volatiles’ flame temperature, devolatilization time, burnout time and peak temperature of the coal particle. Results indicate that the impact of shifting from air-firing to oxy-firing affects the devolatilization, burnout times, and peak temperature in PC and FB differently: PC particles require higher concentration of oxygen than coarse particles for FB to attain similar results as in air-firing. However, the impact on the volatile flame temperature of shifting to oxy-fuel flame is similar in PC and FB. In general, the CO₂ atmosphere delays ignition compared to air-firing, particularly for coarse particles at low O₂ concentration.

由于粉煤（PC）和流化床（FB）锅炉中的含氧燃料燃烧潜在地用于捕获二氧化碳，因此正在对其进行越来越多的研究。由于燃料尺寸，炉温和流体动力学，两种类型的单元中的燃烧条件差异很大。这些差异会以不同的方式影响PC和FB中从空气（O ₂ / N ₂）到含氧燃料（O ₂ / CO ₂）的燃烧特性的变化。本文将PC中单个亚烟煤颗粒的氧燃料燃烧行为与FB条件下的氧燃料燃烧行为进行了比较。FB数据是在我们的台式FB测试装置中测量的，而PC数据是从文献中收集的。FB测试是在1088 K和0％的条件下进行的_vol <O ₂ <40％_vol，使用直径为6 mm的次烟煤。比较了大量参数，包括点火延迟时间，挥发物的火焰温度，脱挥发分时间，燃尽时间和煤颗粒的峰值温度。结果表明，从空气燃烧转变为氧燃烧对PC和FB的脱挥发分，燃尽时间和峰值温度的影响不同：PC颗粒需要比粗颗粒更高的氧浓度才能使FB获得与空气中相似的结果-射击。但是，在PC和FB中，转变为含氧燃料火焰对挥发性火焰温度的影响相似。通常，CO ₂与空气点火相比，大气会延迟点火，特别是对于O ₂浓度低的粗颗粒而言。