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Development of a High Pressure Dry Coal Feed System for a 100 kW_t Oxy-Coal Reactor

机译:100 kW_t氧式反应器的高压干煤系统的开发

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A design concept to feed dry coal from a hopper to a 100 kW, pressurized oxy-coal (POC) reactor using CO_2 at 2 MPa was developed using transient computational fluid dynamics (CFD) simulations and bench-scale measurements. The feed system was required to maintain a steady flow of gas and solids at a coalflowrate of approximately 3.8 g/s and a CO_2-to-coal mass ratio in the range 1-2. A 5.08-cm diameter vertical coal hopper feeding into a 0.635-cm diameter horizontal pipe was used to represent key elements of the feed system. A fluidized bed concept was found capable of providing the desired coal flowrate and CO_2-to-coal flow ratio. Use of separate fluidization and dilution flows allowed the coal flowrate and CO_2-to-coal flow ratio to be controlled independently. The amount of coal transported from the hopper was dependent on the net CO_2 flow in the hopper but independent of the CO_2 dilution flow. Pipe exit coal flowrates were found to fluctuate at levels acceptable for steady burner operation. Tests from a bench-scale apparatus using Pittsburgh 8 coal with a median particle diameter of 50 μm and moisture content of 6% confirmed the feasibility of the fluidization design. However, for a given CO_2 fluidization flowrate, experimental coal flowrates were lower than predicted coal flow, in part due to simplifying assumptions of dry, spherical coal particles and smooth piping in the simulations.
机译:使用瞬态计算流体动力学(CFD)模拟和台式测量,开发了使用2MPa的CO_2从料斗进入100kW,加压氧 - 煤(POC)反应器的设计概念。需要在1-2范围内保持约3.8g / s的煤辉芽段,在大约3.8g / s的煤开采中保持稳定的气体和固体流动。使用5.08厘米直径的垂直煤料斗进给0.635厘米直径的水平管,以表示进料系统的关键元件。发现流化床概念能够提供所需的煤流量和CO_2-煤流量。使用单独的流化和稀释流量使煤流量和CO_2对煤流量比以独立控制。从料斗运输的煤量依赖于料斗中的净CO_2流量,而是独立于CO_2稀释流。发现管道出口煤流量被发现在稳定燃烧器操作可接受的水平下波动。从使用匹兹堡8煤的台级装置测试,中间粒径为50μm,水分含量为6%,确认了流化设计的可行性。然而,对于给定的CO_2流化流量,实验煤流量低于预测的煤流量,部分原因是简化了干燥,球形煤颗粒和模拟中平滑管道的假设。

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