本文运用欧拉多相流模型对该设计旋流气浮装置内两相流流体动力学实施数值模拟,实际中旋流气浮过程中油滴和气泡相互作用,通过碰撞黏附形成油气混合相,本文简化油–气–水三相流动为油气混合相和水相流动,在给定油气混合相密度700 kg/m...本文运用欧拉多相流模型对该设计旋流气浮装置内两相流流体动力学实施数值模拟,实际中旋流气浮过程中油滴和气泡相互作用,通过碰撞黏附形成油气混合相,本文简化油–气–水三相流动为油气混合相和水相流动,在给定油气混合相密度700 kg/m3条件下进行浓度场、速度场分析,探究操作参数处理量和分流比对该装置分离效率的影响,模拟结果显示:在含油污水处理量1 m3/h~2.2 m3/h范围内,处理量为1 m3/h时,除油效果最佳,之后随着处理量增加,除油效率下降;当出油口分流比在(0.04~0.16)范围内时,装置的除油效率随着出油口分流比增大而提高,但顶部出油口液体中的含油体积分数下降,综合考量出油口分流比为(0.12~0.16)时,该装置的除油效果较好。This article uses the Euler multiphase flow model to numerically simulate the two-phase fluid dynamics in the designed cyclone air flotation device. In practice, the interaction between oil droplets and bubbles during the cyclone air flotation process forms an oil gas mixed phase through collision adhesion. This article simplifies the oil gas water three-phase flow into an oil gas mixed phase and a water phase flow. Under the given oil gas mixed phase density of 700 kg/m3, the concentration field and velocity field analysis are carried out to explore the influence of operating parameters, processing capacity, and diversion ratio on the separation efficiency of the device. The simulation results show that in the range of 1 m3/h~2.2 m3/h for oily wastewater treatment, the oil removal effect is optimal when the processing capacity is 1 m3/h, and then decreases with the increase of processing capacity;When the oil outlet diversion ratio is within the range of (0.04~0.16), the oil removal efficiency of the device increases with the increase of the oil outlet diversion ratio, but the volume fraction of oil in the liquid at the top oil outlet decreases. Taking into account the oil outlet diversion ratio of (0.12~0.16), the oil removal efficiency of the device is better.展开更多
能源消费是碳排放的主要来源。根据IPCC碳排放计算指南缺省值计算了哈萨克斯坦共和国1992-2010年的碳排放量,并对哈萨克斯坦近20a来碳排放进行阶段划分,采用对数平均迪氏指数法(Logarithmic Mean Divisia Index),对碳排放量进行因素分解...能源消费是碳排放的主要来源。根据IPCC碳排放计算指南缺省值计算了哈萨克斯坦共和国1992-2010年的碳排放量,并对哈萨克斯坦近20a来碳排放进行阶段划分,采用对数平均迪氏指数法(Logarithmic Mean Divisia Index),对碳排放量进行因素分解,定量分析能源结构、能源效率和经济发展对不同阶段碳排放的影响。结果表明:(1)1992-2010年,哈萨克斯坦一次能源消费的碳排放量整体呈先下降后上升的"U"型曲线,拐点在1999年。煤炭消费仍然是碳排放的主要来源,这是受长期以煤为主能源供应政策影响的一种必然结果;(2)碳排放不同阶段各影响因素的作用程度不同。总体来看,经济增长是碳排放量增加的主要推动因素,能源强度降低是抑制碳排放量增长的主要贡献因子。并以此提出哈萨克斯坦未来能源战略的一些政策建议。展开更多
文摘本文运用欧拉多相流模型对该设计旋流气浮装置内两相流流体动力学实施数值模拟,实际中旋流气浮过程中油滴和气泡相互作用,通过碰撞黏附形成油气混合相,本文简化油–气–水三相流动为油气混合相和水相流动,在给定油气混合相密度700 kg/m3条件下进行浓度场、速度场分析,探究操作参数处理量和分流比对该装置分离效率的影响,模拟结果显示:在含油污水处理量1 m3/h~2.2 m3/h范围内,处理量为1 m3/h时,除油效果最佳,之后随着处理量增加,除油效率下降;当出油口分流比在(0.04~0.16)范围内时,装置的除油效率随着出油口分流比增大而提高,但顶部出油口液体中的含油体积分数下降,综合考量出油口分流比为(0.12~0.16)时,该装置的除油效果较好。This article uses the Euler multiphase flow model to numerically simulate the two-phase fluid dynamics in the designed cyclone air flotation device. In practice, the interaction between oil droplets and bubbles during the cyclone air flotation process forms an oil gas mixed phase through collision adhesion. This article simplifies the oil gas water three-phase flow into an oil gas mixed phase and a water phase flow. Under the given oil gas mixed phase density of 700 kg/m3, the concentration field and velocity field analysis are carried out to explore the influence of operating parameters, processing capacity, and diversion ratio on the separation efficiency of the device. The simulation results show that in the range of 1 m3/h~2.2 m3/h for oily wastewater treatment, the oil removal effect is optimal when the processing capacity is 1 m3/h, and then decreases with the increase of processing capacity;When the oil outlet diversion ratio is within the range of (0.04~0.16), the oil removal efficiency of the device increases with the increase of the oil outlet diversion ratio, but the volume fraction of oil in the liquid at the top oil outlet decreases. Taking into account the oil outlet diversion ratio of (0.12~0.16), the oil removal efficiency of the device is better.
文摘能源消费是碳排放的主要来源。根据IPCC碳排放计算指南缺省值计算了哈萨克斯坦共和国1992-2010年的碳排放量,并对哈萨克斯坦近20a来碳排放进行阶段划分,采用对数平均迪氏指数法(Logarithmic Mean Divisia Index),对碳排放量进行因素分解,定量分析能源结构、能源效率和经济发展对不同阶段碳排放的影响。结果表明:(1)1992-2010年,哈萨克斯坦一次能源消费的碳排放量整体呈先下降后上升的"U"型曲线,拐点在1999年。煤炭消费仍然是碳排放的主要来源,这是受长期以煤为主能源供应政策影响的一种必然结果;(2)碳排放不同阶段各影响因素的作用程度不同。总体来看,经济增长是碳排放量增加的主要推动因素,能源强度降低是抑制碳排放量增长的主要贡献因子。并以此提出哈萨克斯坦未来能源战略的一些政策建议。