浮碱和结晶的成长分散

在纯碱生产中悬浮床重碱结晶在长时间内不沉降,即产生浮碱。作者在参与联碱模试和工业化试验过程中关注浮碱现象,探讨结晶过程基础、OSLO结晶器分级操作时产品粒径的周期性变化、结晶成长的速度分散、固液分散体系、结晶的团聚对结晶成长的影响,总结出浮碱的产生是由重碱结晶晶胚的成长分散引起。

探讨联合制碱装置提产方案、碳化过程优化及降本增效前景展望

联碱装置由于其生产流程较长,设备较多的特性,一直以来存在设备生产能力与生产负荷匹配不协调的问题,导致在装置整体满负荷的情况下,一些设备却无法达到最佳的利用率,如何提高单台设备生产能力,成为公司增强市场竞争力的一项课题。在保证产品质量、节能降耗的同时,提高产品产量是企业今后的发展方向。笔者以天津渤化永利化工股份有限公司联碱装置实际运行情况为基础,对装置提产方案、碳化过程优化、节能降耗及管理模式进行简单阐述。

Analyses of Multiplicity and Stability Patterns of Agglomeration Controlled Precipitation with Both Primary and Secondary Nucleations

The possibility of multiplicity in an isothermal continuous mixed suspension-mixed product removalcrystallizer is explored using the bifurcation theory. A process involving agglomeration controlled precipitationis considered in which secondary nucleation occurs simultaneously with primary nucleation. The determinantequations for the existence of multiple steady states are developed and the multiplicity boundaries dependent on thephysical and kinetic properties and operational parameters of the process are obtained by resolving these determinantequations. The number of steady states in the precipitator for various multiplicity regions is determined and thelinear stability of these steady states is analyzed by using the Routh criterion.