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样气预处理系统技术是冷干直抽法CEMS系统的核心和关键技术.在线样气预处理技术的重点和难点是样气的除湿和除尘处理.不同于传统的冷凝除湿,Nafion管除湿具有其独特的特点,是对现有除湿技术的一大补充.而以Nafion管为核心的GASS样气预处理系统,则集取样、二次过滤除尘、除酸雾除氨气、Nafion管干燥为一体,是一种创新的冷干直取法CEMS样气预处理技术,可彻底解决冷干直抽法CEMS中冷凝水和铵盐结晶问题. 相似文献
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气射流的射流束特征与预处理效果密切相关,而喷射压力是影响射流束特征的主要因素.为确定合适的喷射压力,建立气相流场三维模型,对气射流进行仿真模拟,研究不同喷射压力下气相流场的分布情况和磨粒的运动规律.实验结果表明,当喷射压力为0.3 MPa时,对CFRP进行首次涂装表面预处理能满足涂装要求. 相似文献
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为提升航空发动机气路系统状态监测的有效性,提出一种采用深度学习并结合独立分量分析(independent component analysis,简称ICA)的新方法,对航空发动机气路系统的健康状态进行了监测技术研究。首先,对实际采集的航空发动机气路系统健康监测参数进行预处理,对预处理后的参数数据采用独立分量分析方法进行处理,提取代表当前状态的特征系数矩阵;其次,由提取的特征矩阵创建深度学习状态监测模型;最后,由创建的状态监测模型对航空发动机气路系统健康状态进行监测。为验证所提方法的有效性,采用典型神经网络与支持向量机分别对由主成分分析(principal components analysis,简称PCA)和ICA构建的特征矩阵进行了状态监测研究。结果表明,采用ICA和深度学习相结合的状态监测方法,可以更好地实现对航空发动机气路系统的状态监测,有良好的应用与推广前景。 相似文献
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潘波 《工业仪表与自动化装置》2019,(5)
通过对焦化电捕焦油器煤气含氧量分析仪在线预处理装置工作效率低下和连续运行时间较短问题的分析研究,查找预处理系统的不足与缺陷,分析其原因,提出有效的优化改造方案。采用组合式"轻负荷"三级预处理技术方法,解决了困扰公司多年的焦煤氧含量分析取样传输管线被焦油和萘造成的气路堵塞,氧分析气室被硫污染腐蚀严重等问题。 相似文献
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烧结烟气超低排放改造后,具有湿度高、SO_(2)浓度低、存在氨逃逸的特点,给冷干直抽法CEMS造成SO_(2)检测值偏低或为“0”,全程通SO_(2)标气响应时间和示值误差超标的问题。问题的来源在于冷凝水析出,溶解SO_(2);逃逸氨在CEMS中发生二次脱硫,且生成的铵盐能吸附SO_(2)。对目前成熟应用的滴加液体磷酸技术,及高温固态填料除氨+Nafion管干燥器除湿技术进行了研究,最终确认并使用了PreGASS除氨、除湿预处理系统。在某钢铁厂烧结排口CEMS进行了长时间应用,彻底解决了监测数据偏低、全程通标气不达标问题,预处理系统的效果完全符合国标和地方标准的要求,确保了在线监测数据的“真、准、全”。 相似文献
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采用自主研制的在线超低温预浓缩设备,连续在线采集大气样品或者连续采集苏玛罐离线样品,对样品进行超低温捕集浓缩和二次超低温冷冻聚焦,采用全二维气相色谱-飞行时间质谱联用技术分离检测浓缩后的挥发性有机物,实现对大气中C2~C12共100多种挥发性有机物的浓缩富集和定性定量分析。本研究对该方法的线性、重复性、加标回收率、检出限等性能进行表征,并与常规一维气相色谱-四极杆质谱联用系统的定性定量结果进行比较。结果表明,该方法不仅满足大气中挥发性有机物检测的性能指标要求,且组分定性定量的准确性、灵敏度等指标均优于一维气相色谱-四极杆质谱联用技术,在挥发性有机物成分较复杂的大气样品检测中具有明显优势。 相似文献
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To obtain data for experiments and applications of HPR20PLUS on-line mass spectrometer in low pressure. The gas, standard gas, and breath gas of low pressure cabin were analyzed respectively in unman and manned experiments under different low pressure. The accuracy and stability of HPR20PLUS On-line Mass Spectrometer in unman experiments under different low pressure were conformed to the requirements of HPR20PLUS on-line mass spectrometer, and the changes of breath gas in manned experiments were accorded with the laws of human experiments . Performance tests of HPR20PLUS on-line mass spectrometer in low pressure is excellent , and HPR20 PLUS on-line mass spectrometer can be used for human experiments under low pressure . 相似文献
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A simple PVT quantitative method of Kr in the high pure N2 was studied. Pressure, volume and temperature of the sample gas were measured by three individual methods to obtain the sum sample with food uncertainty. The ratio of Kr/N2 could be measured by GAM400 quadrupole mass spectrometer. So the quantity of Kr could be calculated with the two measured data above. This method can be suited for quantitative analysis of other simple composed noble gas sample with high pure carrying gas. 相似文献
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The international monitoring system (IMS) station transport noble gas sample is analyzed by quadrupole mass spectrometer. The sample is composed by absolute majority of xenon and nitrogen, therefore, it can be calculated by the method of equation of state of ideal gas (PTV). The relatively expanded uncertainty of the xenon quantity is 4.5% in 95% confidence level. 相似文献
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Scanning mass spectrometer for quantitative reaction studies on catalytically active microstructures
Roos M Kielbassa S Schirling C Häring T Bansmann J Behm RJ 《The Review of scientific instruments》2007,78(8):084104
We describe an apparatus for spatially resolving scanning mass spectrometry which is able to measure the gas composition above catalytically active microstructures or arrays of these microstructures with a lateral resolution of better than 100 mum under reaction conditions and which allows us to quantitatively determine reaction rates on individual microstructures. Measurements of the three-dimensional gas composition at different vertical distances and separations between active structures allow the evaluation of gas phase mass transport effects. The system is based on a piezoelectrically driven positioning substage for controlled lateral and vertical positioning of the sample under a rigidly mounted capillary probe connecting to a mass spectrometer. Measurements can be performed at pressures in the range of <10(-2)-10 mbars and temperatures between room temperature and 450 degrees C. The performance of the setup is demonstrated using the CO oxidation reaction on Pt microstructures on Si with sizes between 100 and 300 mum and distances in the same order of magnitude, evaluating CO(2) formation and CO consumption above the microstructures. The rapidly decaying lateral resolution with increasing distance between sample and probe underlines the effects of (lateral) gas transport in the room between sample and probe. The reaction rates and apparent activation energy obtained from such measurements agree with previous data on extended surfaces, demonstrating the feasibility of determining absolute reaction rates on individual microstructures. 相似文献
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本文介绍了在线质谱仪和在线气相色谱仪的原理及结构,并根据各自的特点对其应用进行简单总结和比较。由于两者工作原理的差异,在线质谱仪具有更快的分析速度和定性能力,而在线气相色谱仪对成分复杂的气体可达到更好的分离效果,在日常维护中,两者也存在较大的差别。因此,在实际应用中,要考虑现场监测的需要来选择合适的仪器。 相似文献
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