定容式粉体静电在线监测仪的设计

介绍了一种可实现与DCS系统通讯的粉体静电在线监测仪。它利用定容式法拉第筒原理，即在管道旁路中放置法拉第筒结构的定容电荷室。通过控制装在定容电荷室下面的电磁阀，实现对粉体的在线采样。通过建立粉体荷质比和静电监测仪输出电压之间的关系，实现对粉体荷质比的直接测量。该粉体静电监测仪能够实现对粉体静电的实时、在线、远程监测。这种方法比直接测量静电电压和静电电场的方法具有更高的精度，同时它弥补了DQJ-2粉体静电监测器需要手动操作的不足。定容式粉体静电在线监测仪和静电消除器配套使用，可以有效地对静电电量进行监测和消除，减少燃爆事故的发生，保证企业的安全生产。

Designing of Fixed-capacity and On-line Measuring Instrument for Electrostatic Charge of Particles

On-line measuring instrument for electrostatic charge of particles which can communicate with DCS system was introduced.It makes use of the principles of fixed-capacity faraday pail,a fixed-capacity charge chamber which adopts faraday pail structure was mounted in the bypass of the pipeline.By controlling the on-off of the electromagnetism valve which is under the fixed-capacity charge chamber,the on-line sampling of the particles can be implemented.The establishment of the relation between the charge density of mass and the output voltage of measuring instrument for electrostatic charge helps us to measure particles' charge density of mass directly.This measuring instrument for electrostatic charge of particles can realize the real-time ,on-line and remote detection of electrostatic charge of particles.This method has a higher accuracy than that of measuring the electrostatic voltage or electrostatic field.Meanwhile,it remedies the shortage of DQJ-2 measuring instrument for electrostatic charge of particles which needs manual operations.The using of fixed-capacity and on-line measuring instrument for electrostatic charge of particles together with electrostatic eliminator can monitor and eliminate the electrostatic charge effectively.So it can reduce the happening of fires and explosions and ensure the safety in production.