Pressurized oxy-combustion is a promising technology for low-carbon, fossil fuel utilization. It has the potential of improved efficiency and economics compared with conventional atmospheric pressure oxy-combustion. Washington University in St. Louis has proposed a new pressurized oxy-combustion process, namely Staged Pressurized Oxy-Combustion, which has the potential to improve further the plant efficiency, operational flexibility, and economics. This process burns pulverized coal in a pressurized, oxy-combustion environment, which has not been demonstrated in a pilot-scale system before. To address this gap, a 100 kW_th pressurized oxy-combustion facility was designed and constructed. This facility has a unique burner and furnace design featuring a co-axial, low-mixing flow field, which is drastically different from conventional coal-fired boiler designs where strong mixing is sought by introducing swirl or recirculating flows. This work aims to present the first pilot-scale experimental results of a dry-feed, pressurized oxy-combustion system. The tests focused on exploring flame stability and shape, char burnout, and fine particulate matter formation. Testing results suggest that the burner has excellent flame stability. The flame shape is consistent with the design philosophy and agrees with large eddy simulations. Importantly, complete char combustion can be achieved with an oxygen mole fraction in the flue gas of only 0.8%, as opposed to a required value of ~3% for conventional atmospheric pressure air-fired or oxyfuel combustion, which reduces the costs of both oxygen generation upstream and oxygen removal downstream. The testing results show promise for dry-feed, pressurized oxy-combustion, and the new burner and furnace design.

加压氧燃烧是一种用于低碳，化石燃料利用的有前途的技术。与常规的大气压氧燃烧相比，它具有提高效率和经济性的潜力。位于圣路易斯的华盛顿大学提出了一种新的加压氧燃烧工艺，即分段加压氧燃烧，它有可能进一步提高工厂效率，运营灵活性和经济性。此过程在加压的氧气燃烧环境中燃烧煤粉，这在中试规模的系统中尚未得到证明。为了解决这个间隙，一个100千瓦_第设计并建造了加压氧气燃烧设施。该设施具有独特的燃烧器和熔炉设计，具有同轴的低混合流场，这与传统的燃煤锅炉设计大不相同，在传统的燃煤锅炉设计中，通过引入旋流或再循环流来寻求强力混合。这项工作旨在介绍干式进料加压氧燃烧系统的首批中试规模的实验结果。测试的重点是探索火焰的稳定性和形状，炭烧尽和细小颗粒物质的形成。测试结果表明该燃烧器具有出色的火焰稳定性。火焰形状与设计理念一致，并与大型涡流模拟相符。重要的是，仅烟道气中的氧气摩尔分数仅为0.8％，即可完全燃烧碳，与传统的大气压空气燃烧或含氧燃料燃烧所需的〜3％的值相反，这降低了上游氧气产生和下游氧气去除的成本。测试结果显示了干式进料，加压氧燃烧以及新的燃烧器和熔炉设计的希望。