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高温电除尘器+SCR脱硝技术路线是目前水泥行业氮氧化物超低排放的有效途径之一,在SCR反应器前设置高温电除尘器,将含尘浓度降低至20~30 g/Nm3以下,解决窑尾烟气中含尘量大的问题,方便选取更为可靠的催化剂形式和规格。本文结合国内首台水泥SCR脱硝项目的成功应用对脱硝前置高温除尘器选型及技术特点进行详细论述,提出了高温环境下电除尘器稳定运行应采取的应对措施,为以后的设计者提供经验借鉴。 相似文献
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高温电除尘器+SCR脱硝技术路线是目前水泥行业氮氧化物超低排放的有效途径之一,在SCR反应器前设置高温电除尘器,将含尘浓度降低至20g/Nm~3~30g/Nm~3以下,解决水泥炉窑尾烟气中含尘量大的问题,方便选取更为可靠的催化剂形式和规格。文中结合国内首台水泥SCR脱硝项目的成功应用对脱硝前置高温除尘器选型及技术特点进行详细论述,提出了高温环境下电除尘器稳定运行应采取的应对措施,为以后设计提供经验借鉴。 相似文献
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高温电除尘器+SCR脱硝技术路线是目前水泥行业氮氧化物超低排放的有效途径之一,在SCR反应器前设置高温电除尘器,将含尘浓度降低至20~30 g/Nm3以下,解决窑尾烟气中含尘量大的问题,方便选取更为可靠的催化剂形式和规格。本文结合国内首台水泥SCR脱硝项目的成功应用对脱硝前置高温除尘器选型及技术特点进行详细论述,提出了高温环境下电除尘器稳定运行应采取的应对措施,为以后的设计者提供经验借鉴。 相似文献
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水泥行业已成为继火力发电、机动车后氮氧化物的第三大排放来源,控制水泥行业氮氧化物的排放将有效改善大气环境质量.文章根据水泥行业的现状,就如何对新型干法旋窑水泥企业降氮脱硝提出探讨意见. 相似文献
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在"高温电除尘器+SCR脱硝"一体化技术中,SCR反应器设置在窑尾预热器C1和余热锅炉之间,预热器的废气温度大约为280~350℃,废气经由高温预除尘后由反应器上部导入,与喷氨格栅喷入的还原剂均匀混合,借助反应塔器内催化剂的催化作用,将NOx转化为氮气和水,完成NOx的脱除。该技术对高温电除尘器运行工况及效率要求与窑头窑尾除尘器有很大不同,烟气温度高、粉尘颗粒细、比电阻高,还不能增湿调质。尽管如此,只要对除尘器选型合理、设计科学、制作精良、安装精细,可大幅度提高催化剂的机械及化学寿命,增大催化剂选型空速,显著降低催化剂体积,降低水泥企业的投资成本。随着氮氧化物深度治理工作的持续铺开,"高温电除尘器+SCR脱硝"一体化技术将在水泥行业超低排放中得到广泛应用。 相似文献
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本刊讯2020年4月12日~13日,“河北省水泥行业超低排放改造技术交流现场观摩会”在河北省武安市成功召开。河北省生态环境系统及水泥行业企业代表70余人出席会议并参观了武安新峰水泥公司SCR氮氧化物超低排放工程。武安新峰水泥公司SCR氮氧化物超低排放工程由中国建材集团成都建材工业设计研究院有限公司总包建设,该工程采用了当今世界水泥行业最先进可靠的“高温中尘”SCR脱硝工艺技术,化解了窑尾高粉尘浓度、高有害成分含量烟气对脱硝催化剂寿命和效率的不利影响。项目自2019年11月建成投产以来,各项技术指标优异,氮氧化物排放浓度保持稳定且低于30 mg/Nm3,氨逃逸小于3 ppm。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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A refined nonlinear value of the main parameter of a material, i.e., the elongation modulus versus the instant temperature value, was suggested for introduction into the computational algorithm of tempering stresses. 相似文献
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