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连续式咸淡水混合搅拌反应器混合性能研究
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作者 李杰 陈滇豫 +1 位作者 胡笑涛 何名淞 《农业机械学报》 EI CAS CSCD 北大核心 2024年第11期417-428,共12页
为合理开发利用咸水资源,优化农田灌溉设施前端连续式咸淡水混合搅拌反应器结构和运行参数,探究了搅拌转速和桨叶宽度对不同类型搅拌器咸淡水混合性能的影响。以直径为290 mm的双层桨叶搅拌器为研究对象,采用Realizable k-ε模型和欧拉... 为合理开发利用咸水资源,优化农田灌溉设施前端连续式咸淡水混合搅拌反应器结构和运行参数,探究了搅拌转速和桨叶宽度对不同类型搅拌器咸淡水混合性能的影响。以直径为290 mm的双层桨叶搅拌器为研究对象,采用Realizable k-ε模型和欧拉多相流模型进行数值模拟并利用试验结果对其进行验证。系统分析不同搅拌器结构在不同搅拌转速和桨叶宽度下的湍动能、速度流场、咸水体积分数分布、混合均匀所需时间及搅拌器功耗,发现随着搅拌转速和桨叶宽度增加,三叶开启式搅拌器与组合锚式搅拌器湍动能和液体流速均增加,反应釜内咸水体积分数也随之发生显著变化,到达混合均匀状态所需时间缩短,出口处咸水均匀度和搅拌器功率均呈上升趋势。整体来说,转速对上述指标的影响较桨叶宽度更为显著,另外,2种搅拌器类型中相关指标受转速和桨叶宽度变化的影响差异明显。与三叶开启式搅拌器相比,组合锚式搅拌器达到完全混合均匀状态所需时间最小值虽然低6.8%,但其搅拌功耗却高10%左右。综合考虑灌溉作物水量需求、混合效率和设备能耗等因素,推荐采用较低转速(90 r/min)、宽桨叶(50 mm)的三叶开启式搅拌器,该配置在咸淡水混合过程中能够有效保障混合效率,并在连续混合设备中有效控制能耗的同时满足实际应用需求。研究结果可为连续式咸淡水混合搅拌反应器设计优化提供参考。 展开更多
关键词 咸水灌溉 连续式搅拌反应器 数值模拟 搅拌 混合性能
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Temperature fault-tolerant control system of CSTR with coil and jacket heat exchanger based on dual control and fault diagnosis 被引量:2
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作者 WANG Zai-ying WANG Guo-xin 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第3期655-664,共10页
For the characteristics of the continuous stirred-tank reactor(CSTR) with coil and jacket cooling system,a CSTR temperature dual control solution based on the analysis of the CSTR exothermic reaction control character... For the characteristics of the continuous stirred-tank reactor(CSTR) with coil and jacket cooling system,a CSTR temperature dual control solution based on the analysis of the CSTR exothermic reaction control characteristic was proposed for an organic material polymerization production.The control solution has passive fault-tolerant ability for the jacket cooling water cutting off fault and active fault-tolerant potential for the coil cooling water cutting off fault,and it has good control ability,high saving energy and reducing consumption performance.Fault detection and diagnosis and fault-tolerant control strategy are designed for the coil cooling fault to achieve the active fault-tolerant control function.The CSTR temperature dual control,process fault detection and diagnosis and active fault-tolerant control were full integrated into the CSTR temperature fault-tolerant control system,which achieve fault tolerance control of CSTR temperature for any severe malfunction of jacket cooling or coil cooling cutting off,and the security for CSTR exothermic reaction is improved.Finally,the effectiveness of this system was validated by semi-physical simulation experiment. 展开更多
关键词 continuous stirred-tank reactor (CSTR) exothermic reaction dual control process fault diagnosis fault-tolerant control
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