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首页> 外文会议>The proceedings of AD 2007: Process control amp; compliance: analytical solutions >TUNABLE DIODE LASER SENSORS FOR TRACE MO ISTURE MEASUREMENT IN OLEFINS PRODUCT STREAMS
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TUNABLE DIODE LASER SENSORS FOR TRACE MO ISTURE MEASUREMENT IN OLEFINS PRODUCT STREAMS

机译：可调谐二极管激光传感器，用于烯烃产品流中的痕量水分测量

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摘要

Moisture is an important contaminant in olefins product streams. The production of high-quality polymers requires the critical measurement of trace moisture. Moisture reduces the catalyst activity, reduces the overall reaction efficiency and degrades the quality of the final product. Diode laser absorption sensors offer significant opportunities and advantages for measurements of trace gas concentration due to their high sensitivity, high spectral resolution, fast time response and robustness. The TOLAS technology is advantageously used in the measurement of moisture in olefin product streams.rnThis paper will present the SpectraSensors SS2100 analyzer, which has been developed to measure trace moisture in Olefins product streams based on wavelength modulation spectroscopy. A water (H2O) transition line near 2.7um is selected due to its strong absorption strength, its relative isolation from background gases and the availability of laser sources. A differential measurement scheme is employed to eliminate the interference from background gases (e.g. ethylene). The sample system is mounted in an insulated and electrically heated (50 Deg. C) stainless steel enclosure to prevent condensation of moisture. The analyzer is calibrated using a NIST traceable chilled mirror hygrometer. A repeatability of less than 300 ppbvhas been demonstrated for a 0-3 ppmv measurement range. Demonstration experiments confirm the sensitivity and accuracy of the analyzer.
机译：水分是烯烃产物流中的重要污染物。高质量聚合物的生产要求对痕量水分进行严格测量。水分降低了催化剂的活性，降低了总反应效率并降低了最终产物的质量。二极管激光吸收传感器具有高灵敏度，高光谱分辨率，快速时间响应和耐用性，为痕量气体浓度的测量提供了巨大的机遇和优势。 TOLAS技术有利于烯烃产物流中水分的测量。本文将介绍SpectraSensors SS2100分析仪，该分析仪已开发用于基于波长调制光谱法测量烯烃产物流中的痕量水分。选择一条接近2.7um的水（H2O）过渡线，因为它具有很强的吸收强度，与背景气体的相对隔离以及激光源的可用性。采用差分测量方案消除背景气体（例如乙烯）的干扰。样品系统安装在绝缘且电加热（50摄氏度）的不锈钢外壳中，以防止水分凝结。使用NIST可追溯的冷镜湿度计对分析仪进行校准。在0-3 ppmv的测量范围内，重复性小于300 ppbv。演示实验证实了分析仪的灵敏度和准确性。

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