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首页> 外文会议>International Conference on Pressure Vessel Technology >Numerical Analysis and Structure Improvement for the Corrosion and Cracking of the Mixing Tee for the Quenching Gas of Hydrogen from Coal
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Numerical Analysis and Structure Improvement for the Corrosion and Cracking of the Mixing Tee for the Quenching Gas of Hydrogen from Coal

机译：煤中氢气淬火气体腐蚀和开裂的数值分析及结构改进

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The gully shape thinning due to corrosion often occurs in the cold and hot syngases mixing tee and its downstream straight pipe used in the gas quenching system of the coal gasification process, and leads to leakage and cracking of the pipe which endangers the system safety. Analysis indicates that droplets in the cold syngases turn out to be corrosive droplets when absorbing H2S and CO2 at working pressure and temperature. In this paper, the flow, aggregation and evaporation of the corrosive droplets are simulated with the k-e turbulence model, the species transport model and the discrete phase model by FLUENT. It reveals that the corrosive droplets would aggregate to the downstream of the mixing tee at 0° orientation. The distance of the downstream aggregation is 1.5 m. The aggregation and evaporation of corrosive droplets causes the corrosion thinning of the droplet aggregation region, which leads to tear cracking under high stress. An improved structure is proposed to avoid the corrosive droplet aggregation, in which a fluid guidance is conically flared and welded before the branch entrance. The fluid guidance is made of Inconel8825. The cold syngases flow inside the fluid guidance, and the hot syngases flow outside the fluid guidance. The cold and hot fluid exchanges heat through the guidance but without mixing. The mixing is postponed to the downstream. It shows that the aggregation of the corrosive droplet is effectively eliminated and droplet concentration at the downstream wall is less an order of magnitude of the upstream, which is helpful to avoid the corrosion and cracking of the structure.
机译：由于腐蚀而导致的沟壑变薄通常发生在煤气化工艺的气体淬火系统中使用的冷热系统和下游直管，并导致管道的泄漏和开裂，危及系统安全。分析表明，当在工作压力和温度下吸收H2S和CO2时，冷的Syncis中的液滴将变成腐蚀性液滴。在本文中，用K-E湍流模型，物种传输模型和分立相位模型模拟腐蚀性液滴的流动，聚集和蒸发。揭示腐蚀性液滴将在0°定向上汇集到混合三通的下游。下游聚集的距离为1.5米。腐蚀液滴的聚集和蒸发导致液滴聚集区域的腐蚀变薄，这导致高应力下的撕裂裂纹。提出了一种改进的结构以避免腐蚀性液滴聚集，其中流体引导在分支入口之前呈锥形突出和焊接。流体引导由Inconel8825制成。冷的Syngase在流体引导内流动，并且热的Syngase在流体引导之外流动。冷热流体通过引导进行热量，但不混合。混合被推迟到下游。结果表明，腐蚀性液滴的聚集在下游壁上有效地消除，并且下游壁的液滴浓度较少，上游的级别较小，这有助于避免结构的腐蚀和破裂。

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