计算型pH分析仪在核电厂的应用

介绍了常规pH分析仪测量纯水时的干扰因素,分析了核电厂低电导率水质pH值测量困难的原因。针对压水堆核电厂对pH分析仪的特殊要求,指出计算型pH分析仪完全可以适应压水堆核电厂化学监督的要求,最后总结了压水堆核电厂pH分析仪的使用现状及应用前景。

计算型pH分析仪在发电厂的运用浅析

根据常规pH分析仪测量纯水的干扰因素,分析了导致我国现阶段发电厂测量pH值困难的原因,介绍了计算型pH分析仪原理、结构、测点及应用,发现计算型pH分析仪可以完全适应我国目前发电厂化学监督的要求。

pH和电导率的在线校准仪

设计了一款应用于电厂水汽系统电导率及pH表检测仪表校准的pH和电导率的在线校准仪。本校准仪采用了计算型pH的检测方法,通过测量电导率间接测量pH值,可避免低电导率水pH测量干扰因素的影响。采用交流电阻箱,用数字电位器的方式实现交流电阻。通过自行设计数字的交流电阻箱模拟水中的电导率,用来对仪表进行校验。在线校准仪采用电脑端LabVIEW软件作为上位机控制软件,单片机为核心的嵌入式系统,可以实现采集、检测、二次表校准、数据处理和数据存储等功能控制。

Pole-placement self-tuning control of nonlinear Hammerstein system and its application to pH process control

By taking advantage of the separation characteristics of nonlinear gain and dynamic sector inside a Hammerstein model, a novel pole placement self tuning control scheme for nonlinear Hammerstein system was put forward based on the linear system pole placement self tuning control algorithm. And the nonlinear Hammerstein system pole placement self tuning control(NL-PP-STC) algorithm was presented in detail. The identi fication ability of its parameter estimation algorithm of NL-PP-STC was analyzed, which was always identi fiable in closed loop. Two particular problems including the selection of poles and the on-line estimation of model parameters, which may be met in applications of NL-PP-STC to real process control, were discussed. The control simulation of a strong nonlinear p H neutralization process was carried out and good control performance was achieved.

某燃机电站水汽系统在线化学仪表优化改造

某燃机电站对现场在线化学仪表进行了优化改造,改造后的氢电导率表无需更换再生树脂,提高了氢电导率在线监测的准确性和连续性,改造后的计算型pH表可以一路水样测量pH、电导率、氢电导率指标,大量节省了现场仪表运维人员的工作量。