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针对磷酸二铵装置造粒尾气处理存在的旋流洗涤塔的温度偏高、尾气氨含量高和造粒尾气风机带液结疤等问题,通过调整造粒尾气风机位置、增加风管管径、增加文丘里洗涤器的级数等措施,优化了尾气处理工艺流程。改造后,尾气中氨质量浓度平均值由3.0 mg/L下降至1.091 5 mg/L,每年回收氨量提升2 000余吨。 相似文献
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1原有氨贮槽弛放气氨回收情况
原弛放气氨回收塔为填料塔,通过循环氨水及软水2次洗涤,回收气体中的氨。外部水冷器为U形管式换热器,换热面积为100m2。由于循环水水质差,列管结垢,导致换热效果不理想(循环水进出口压差达0.04MPa),出塔氨水温度高、浓度低,氨回收效果差,出塔尾气中氨含量偏高, 相似文献
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对传统中和尾气吸收装置进行改造,利用磷酸吸收中和尾气中的气氨,循环吸收液重新返回混酸系统使用。通过改造,排放中和尾气中的氨含量由175 mg/m3下降至67mg/m3,使尾气排放达标。 相似文献
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The increase in refractoriness referred to here is usually termed freezing. The study was undertaken to overcome the tendency of pyrometric cones to set or freeze when subjected to prolonged heat treatment when the temperature is more or less fluctuating. The work includes a study of the freezing tendency of some natural clays, of several pottery bodies, and of pyrometric cones. A body was developed that does not freeze under the treatment that produces the phenomenon in the other materials tested but the cause is not established. 相似文献
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介绍煤化工装置空分氧泵变频器的电气控制原理,分析氧泵变频器因系统晃电而导致跳停的原因,通过对变频器增加直流支撑装置,确保空分氧泵变频器稳定运行。 相似文献
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本文介绍了日本在煤气化联合循环发电、煤加氢热解,煤加氢液化和水煤浆等煤转化技术方面是最新进展及中度厂部分试验结果,同时也介绍了日本最近提出的煤气化联合燃料电池新转化工艺的方案。 相似文献
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《Journal of aerosol science》1999,30(3):279-288
A technique based on fluorescence scattering by microdroplets has been shown to be capable of measuring instantaneous rates of photochemical reactions in microdroplets. The technique has been applied to study trans -to-cis photoisomerization of thioindigo dye in single solution droplets suspended in an electrodynamic balance. Through an analysis it is shown that the concentration distributions of isomers remain uniform in a droplet under the experimental conditions; thus, the scattered fluorescence intensity from the droplet is proportional to the concentration of solely fluorescent trans isomer molecules. The steady-state scattered fluorescence intensity versus incident laser power data have been used to interpret the kinetics of the reaction. The results show that the rate constants can be determined from the scattered fluorescence intensity versus time data. The technique is particularly suitable when only one species fluoresces in the photo-reactive wavelength range while other species present in a droplet do not. 相似文献
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介绍了美国近年来在水泥应用方面的研究动态。其基本方针是从材料科学,尤其是脆性材料理论出发,通过改变水泥基材料的组成和改进成型方法,使硬化水泥石的结构趋于合理,从而大幅度提高水泥的各种性能,最终达到部分取代陶瓷、金属、塑料和木材等其它材料的目的。这种新型的水泥材料被称为ACBM(Advanced Cement Based Materials)。美国已建立了ACBM研究中心,并出版了名为“Cementing The Future”的专门刊物来介绍这方面的科技新信息。 相似文献