We conducted a transient experimental investigation of steam–water direct contact condensation in the absence of noncondensible gas in a laboratory-scale column with the inner diameter of 325 mm and the height of 104...We conducted a transient experimental investigation of steam–water direct contact condensation in the absence of noncondensible gas in a laboratory-scale column with the inner diameter of 325 mm and the height of 1045 mm. We applied a new analysis method for the steam state equation to analyze the molar quantity change in steam over the course of the experiment and determined the transient steam variation. We also investigated the influence of flow rates and temperatures ofcooling water on the efficiency ofsteam condensation. Our experimental results show that appropriate increasing of the cooling water flow rate can significantly accelerate the steam condensation. We achieved a rapid increase in the total volumetric heat transfer coefficient by increasing the flow rate of cooling water, which indicated a higher thermal convection between the steam and the cooling water with higher flow rates. We found that the temperature ofcooling water did not play an important role on steam condensation. This method was confirmed to be effective for rapid recovering ofsteam.展开更多
采用Aspen Plus V14建立了固定床煤气化炉的稳态流程模型,对脱矿胜利褐煤(SL^(+))及其加氢氧化钠样品(SL^(+)-NaOH)水蒸气气化过程进行模拟研究.依据实验数据对所建模型进行了准确性验证,证明该模型预测的合成气收率与实验值吻合较好....采用Aspen Plus V14建立了固定床煤气化炉的稳态流程模型,对脱矿胜利褐煤(SL^(+))及其加氢氧化钠样品(SL^(+)-NaOH)水蒸气气化过程进行模拟研究.依据实验数据对所建模型进行了准确性验证,证明该模型预测的合成气收率与实验值吻合较好.基于该模型,研究了汽煤比和气化温度对合成气组成和有效气(CO+H_(2))收率的影响.结果表明,SL^(+)气化合成气中有效气摩尔分数随汽煤比的增大先增大后减小,在汽煤比为0.74时达到最大值75.7%.气化温度对两种煤样的有效气组成影响较大.SL^(+)-NaOH中H2和CO_(2)的产量明显增加,而CO产量相较于SL+明显减少.展开更多
文摘We conducted a transient experimental investigation of steam–water direct contact condensation in the absence of noncondensible gas in a laboratory-scale column with the inner diameter of 325 mm and the height of 1045 mm. We applied a new analysis method for the steam state equation to analyze the molar quantity change in steam over the course of the experiment and determined the transient steam variation. We also investigated the influence of flow rates and temperatures ofcooling water on the efficiency ofsteam condensation. Our experimental results show that appropriate increasing of the cooling water flow rate can significantly accelerate the steam condensation. We achieved a rapid increase in the total volumetric heat transfer coefficient by increasing the flow rate of cooling water, which indicated a higher thermal convection between the steam and the cooling water with higher flow rates. We found that the temperature ofcooling water did not play an important role on steam condensation. This method was confirmed to be effective for rapid recovering ofsteam.
文摘采用Aspen Plus V14建立了固定床煤气化炉的稳态流程模型,对脱矿胜利褐煤(SL^(+))及其加氢氧化钠样品(SL^(+)-NaOH)水蒸气气化过程进行模拟研究.依据实验数据对所建模型进行了准确性验证,证明该模型预测的合成气收率与实验值吻合较好.基于该模型,研究了汽煤比和气化温度对合成气组成和有效气(CO+H_(2))收率的影响.结果表明,SL^(+)气化合成气中有效气摩尔分数随汽煤比的增大先增大后减小,在汽煤比为0.74时达到最大值75.7%.气化温度对两种煤样的有效气组成影响较大.SL^(+)-NaOH中H2和CO_(2)的产量明显增加,而CO产量相较于SL+明显减少.
