Boiler fan is the main power consumption device in thermal power units and the induced draft fan accounted for the largest proportion. Reducing the energy consumption rate of induced draft fan is the main path to redu...Boiler fan is the main power consumption device in thermal power units and the induced draft fan accounted for the largest proportion. Reducing the energy consumption rate of induced draft fan is the main path to reduce the power consumption rate of thermal power units. The induce fan driven by small turbine is greatly effective for reducing the power consumption rate and the supply coal consumption rate in large thermal power plant. Take 1000 MW power units for example, the selection of steam source for steam turbine were discussed and economic performance of the unit under different steam source was compared in this paper. The result shows that compared with the motor driven method, there is about 1.6 g/kWh decrease in supply coal consumption rate driven by the fourth stage extraction steam;whereas there is about 2.5 g/kWh decrease in supply coal consumption rate driven by the fifth stage extraction steam.展开更多
在颗粒流动的动理学理论(Kinetic Theory of Granular Flow,KTGF)基础上,采用双流体模型(Two-Fluid Model,TFM)模拟风扇旋转作用下气体和颗粒的流动行为,分析摩擦应力模型和摩擦起始体积分数对颗粒携带效率的影响。结果表明,流场依据颗...在颗粒流动的动理学理论(Kinetic Theory of Granular Flow,KTGF)基础上,采用双流体模型(Two-Fluid Model,TFM)模拟风扇旋转作用下气体和颗粒的流动行为,分析摩擦应力模型和摩擦起始体积分数对颗粒携带效率的影响。结果表明,流场依据颗粒速度与体积分数分布被划分为诱导上流区、自由流动区和尾迹流动区。降低摩擦起始体积分数导致颗粒整体压力减小了3.9%。在摩擦起始体积分数分别为0.4和0.5的条件下,与Schaffer摩擦模型相比,Johnson-Jackson(JJ)模型预测风扇携带的颗粒质量分别增加了4.06 kg和1.08 kg。Johnson-Jackson模型下摩擦起始体积分数的影响要高于Schaffer模型,目前的数值模拟证实了气固双流体模型与颗粒动理学理论以及多重参考系法可以有效地应用于分析旋转风力驱动引起的颗粒夹带现象。展开更多
文摘Boiler fan is the main power consumption device in thermal power units and the induced draft fan accounted for the largest proportion. Reducing the energy consumption rate of induced draft fan is the main path to reduce the power consumption rate of thermal power units. The induce fan driven by small turbine is greatly effective for reducing the power consumption rate and the supply coal consumption rate in large thermal power plant. Take 1000 MW power units for example, the selection of steam source for steam turbine were discussed and economic performance of the unit under different steam source was compared in this paper. The result shows that compared with the motor driven method, there is about 1.6 g/kWh decrease in supply coal consumption rate driven by the fourth stage extraction steam;whereas there is about 2.5 g/kWh decrease in supply coal consumption rate driven by the fifth stage extraction steam.
文摘在颗粒流动的动理学理论(Kinetic Theory of Granular Flow,KTGF)基础上,采用双流体模型(Two-Fluid Model,TFM)模拟风扇旋转作用下气体和颗粒的流动行为,分析摩擦应力模型和摩擦起始体积分数对颗粒携带效率的影响。结果表明,流场依据颗粒速度与体积分数分布被划分为诱导上流区、自由流动区和尾迹流动区。降低摩擦起始体积分数导致颗粒整体压力减小了3.9%。在摩擦起始体积分数分别为0.4和0.5的条件下,与Schaffer摩擦模型相比,Johnson-Jackson(JJ)模型预测风扇携带的颗粒质量分别增加了4.06 kg和1.08 kg。Johnson-Jackson模型下摩擦起始体积分数的影响要高于Schaffer模型,目前的数值模拟证实了气固双流体模型与颗粒动理学理论以及多重参考系法可以有效地应用于分析旋转风力驱动引起的颗粒夹带现象。
