氧化铝生料浆配料过程自动控制系统设计.docVIP

编号 毕业设计(论文) 氧化铝生料浆配料过程自动 控制系统的设计 The Design of Automatic Control System for The Blending Process In Alumina Production 学院名称 专业名称 学生姓名 学号 指导教师 摘 要 随着我国铝工业的发展和电解铝产量的增加，我国氧化铝产量多年来处于供不应求的局面，进口氧化铝逐年增加，因此，近年来我国氧化铝工业发展迅猛。仅中国铝业公司所属六大氧化铝厂，几乎每年增产80万吨的产量，另外，还有多个100万吨左右规模的氧化铝厂正在建设。 本文氧化铝生料浆配料过程自动控制碱粉由皮带秤运送到化碱池，赤泥浆由赤泥浆泵输送到化碱池，两者在化碱池中充分混合后形成碱赤泥浆。碱赤泥浆由碱赤泥浆泵输送至磨机中，混矿和石灰石通过皮带秤运送到球磨机中，碱赤泥浆、混矿和石灰石在磨机里经充分的混合、研磨后形成碱比、钙比、水分指标符合生产要求的生料浆，输送至生料浆槽。 硬件设计包括I/O地址分配，变频器，流量计，传感器，水泵，皮带秤的选型。氧化铝生料浆配料过程自动控制系统的设计主要包括逻辑控制，回路控制等。通过逻辑控制完成设备的启停及设备间的连锁保护功能，增强配料过程的安全性、连续性；通过回路控制完成各物料的准确的计量。尽量按照给定的配比准确配料，提高生料浆一次性出磨的合格率。监控画面使用MCGS，包括整体工艺流程图，加碱系统监控，球磨机系统监控，设备运行状态监控。 关键词：化碱；混合；逻辑控制；回路控制 Abstract With the development of Chinas aluminum industry and electrolytic aluminum production increased, and Chinas alumina production for many years in the supply situation, alumina imports increased year by year. Therefore, in recent years, Chinas alumina industry development is swift and violent. Aluminium Corp belongs to the six largest alumina plant, almost every year to increase production of 800 thousand tons, in addition, there are more than 1 million tons of scale alumina plant is being built. The alumina raw slurry blending process automatic control alkali powder conveyed to the alkali pool by the belt weigher, red mud from red mud pump delivery to alkali pool, both in the alkali tank is fully mixed form alkali red mud. Red alkali slurry by red alkali slurry is pumped to the mill and mixed limestone mine and through belt weigher transported to the mill, alkali red mud, mixed ore, limestone in the mill after fully mixing and grinding forming alkali ratio, calcium ratio, water indicators in line with the requirements of the production of raw slurry, conveying to the raw slurry tanks. The hardware design includes I/O address assignment, frequency converter, flow meter, sensor, water pump and belt scale. Design of automatic control system of alumina blending