外取热器传热管的缺陷分析及结构改进

介绍了外取热器的工作原理，对外取热器传热管的缺陷进行了分析，在扬子石油化工股份有限公司催化裂化装置外取热器的结构改造中，引用了新型传热管，解决了原传热管结构中联箱焊缝部位出现裂纹引起泄漏问题，从根本上消除这一设备隐患。这次改造不仅降低了成本，而且提高了外取热器的换热效果，减少了装置能耗，并获得了良好的经济效益，为装置平稳运行提供了保障。

Minimum sensing cell measurement in network domain based on PIR sensor array

To reasearch on the infrared target perception by pyroelectric infrared (PIR) sensor in network domain measurement,a closed sensing network domain composed of eight-PIR-sensor array is proposed for the minimum sensing cell measurement in network domain and to realize the moving target perception and trajectory prediction. Moreover,the feasibility and accuracy of the proposed method are verified through experiments. The experimental results demonstrate that the maximum error between the real trajectory and the predicted trajectory of the minimum sensing cell measurement method is 0.64 m,which can achieve infrared target perception and moving trajectory prediction.

Infrared Sensor with Liquid Crystal Chopper

An infrared sensor using the liquid crystal chopper is presented. The infrared sensor is designed to detect infrared rays with a pyroelectric element used as a liquid crystal chopper in such an infrared sensor or the like.