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《中国测试》2018,(11)
为减少环境污染,我国已经针对污染气体实施新的超低排放控制法规,要求燃煤电厂SO_2、NO、NO_2排放浓度分别低于30×10–~6,75×10–6,55×10–~6。为解决监测低浓度SO_2和NO的混合气体时,传统差分光学密度法(differential optical absorption spectroscopy,DOAS)对NO和SO2的检测不能满足新要求的问题,该文使用SO2的另一个吸收谱段,信噪比相比之前(290~320 nm)提高10倍,而且不受NO的影响,可以精确计算SO_2的浓度。采用新的混合光谱分离方法,实现传统DOAS不能实现的功能。该方法对SO_2的检测限为0.1×10–6/m,NO浓度在(0~5)×10–6时,相对误差绝对值低于5%,浓度在(6~60)×10–6之间,相对误差绝对值低于2%。SO2浓度在(0~4)×10–6时,相对误差绝对值低于5%,SO_2浓度在(4~27)×10–6时,相对误差绝对值低于2%,实验结果表明:该方法能检测低浓度下NO和SO_2的混合气体,检测限和误差均优于传统DOAS处理方法。 相似文献
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于2001年国庆期间对北京市大气污染物SO2、CO、NOx与O3进行了连续监测,分析了各污染物浓度的变化特点及污染物之间的关系,评价了监测期间北京市的空气质量状况。结果表明:SO2、CO、NOx、O3体积分数均有明显的日变化特征。SO2体积分数日变化特征与冬季采暖期相比差异较大;NOx、CO体积分数的日变化趋势相近,低值区均出现在白天11:00~17:00;O3体积分数日变化特征显著,最大值出现在午后14:00左右,局地光化学反应生成是白天低层O3的主要来源。由相关性分析可知,O3与NOx呈负相关,相关系数为-0.53;CO与NOx呈正相关,相关系数为0.85。 相似文献
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采用浸渍法制备了Mn-Cu-La/TiO2催化剂,研究了其组分配比、焙烧温度等制备条件和NO进口浓度、空速、O2含量、NH3/NO摩尔比等操作条件对Mn-Cu-La/TiO2上NH3低温还原NO活性的影响;探讨了H2O、SO2对Mn-Cu-La/TiO2活性的影响.结果表明,该催化剂具有很好的低温SCR活性,空速为10 000h-1,反应温度为150℃下时NO转化率接近99.6%.180℃下同时通SO2、H2O后的360min内,活性始终保持在95%以上;单独通入SO2时,该催化剂较容易中毒;单独通入体积分数10%的H2O对催化剂活性基本没有影响,转化率始终保持在98%以上. 相似文献
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以北票市环境空气质量数据为依据,对北票区域内大气环境中SO2、NO2、TSP这三项主要污染物的指标变化与污染成因进行分析探讨,提出进一步改善北票市大气环境质量对策与措施,为北票市的可持续发展、环境综合治理提供科学依据。 相似文献
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机动车尾气的道边在线实时监测(上) 总被引:1,自引:0,他引:1
全文报道我们近年来利用调谐二极管激光器吸收光谱(TDLAS)和紫外差分吸收光谱(DOAS)原理研制的道边实时监测机动车尾气仪及部分路边测试实验结果,详细讨论了该仪器对几种主要有害气体如CO,CO2,NOx,和HC(分别用NO和丁二烯代表)的测试及校正原理,以及各种环境因素如天气、车型、季节、车速、路况等对测试结果的影响及校正,全文分上、下两部分,本部分(上)介绍了监测仪5个组成单元:①用TDLAS技术测量CO和CO2;②用DOAS技术测量NOx和HC;③机动车速度加速度的自动测量;④机动车牌照的获取及存储;⑤数据采集软件的原理、参数性能的设计及实现。 相似文献
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晏伯武 《功能材料与器件学报》2008,14(3):651-655
为探索PZT压电陶瓷材料的损耗机理,对Pb0.9Ba0.05Sr0.05(Sn1/3Nb2/3)0.06(Zn1/3Nb2/3)0.06Ti0.44Zr0.4403分别进行Co2O3、Sb2O3掺杂,Mn(NO3)2、Sb2O3掺杂的实验,以及陶瓷的不同成型工艺的比较实验.该PBSZT体系在相同烧结条件下,一定量的Sb2O,Mn(NO3)2掺杂下,体系机械损耗与介电损耗之比为0.09左右;而一定量的Co2O3、Sb2O3掺杂时,则其值在0.55左右.表明一定的材料组成下,机械损耗和介电损耗有较好的相关性,但同时不同成型方法也对同一组成的两种损耗的比值影响较大. 相似文献
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A. D. Bolychevtsev 《Measurement Techniques》1993,36(6):629-632
Conclusions Consideration has been given to the general notion of technical monitoring as a generic procedure in devising a conceptual framework for ongoing function monitoring that enables its investigation to be undertaken in a language embodying rigorous terminology. The fundamental principles of technical monitoring that underlie its variants have been identified. It has been hypothesized and verified that an adequate representation of ongoing function monitoring can be obtained by numerical monitoring of a quantity that is a modification of the time at which the function in question attains a norm bound. This made it possible to construct a probabilistic mathematical model of ongoing monitoring, reducing the problem of investigating it to the scheme already worked out for investigating numerical monitoring.Translated from Izmeritel'naya Tekhnika, No. 6, pp. 13–15, June, 1993. 相似文献
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Tahir Abbas Zhengming Qian Shabbir Ahmad Muhammad Riaz 《Quality and Reliability Engineering International》2017,33(8):1783-1812
Process monitoring is an essential element for an improved quality of final products. A variety of tools are used for it; control charts are one of these choices. Classical and Bayesian thoughts are 2 main aspects of statistics used in different areas of application. This study introduces an approach to existing theories in applied quality control: Bayesian double exponentially weighted moving average (DEWMA) control charts for monitoring the profiles of products and processes. Three novel univariate Bayesian DEWMA charting structures for the Y intercepts, slopes, and error variances are designed under phase 2 procedures. The performance of the designed structures of control charts is evaluated based on different run length measures. The comparative analysis revealed that Bayesian DEWMA control charts are efficient at identifying the sustainable shifts in the process parameters. Moreover, DEWMA control charts are more effective under classical and Bayesian methodologies for detecting smaller value shifts compared with exponentially weighted moving average charts. We have examined that acquiring extra information in the form of prior's about process parameters comes up with tangible benefits and enhances the detection potential of DEWMA charts for profiles monitoring. An example and case studies are provided to justify the above findings. 相似文献
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G. N. Makarov 《Measurement Techniques》1990,33(6):530-533
Translated from Izmeritel'naya Tekhnika, No. 6, pp. 4–6, June, 1990. 相似文献
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