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高压甲铵冷凝器是我公司尿素装置中重要的高压设备之一,它是一个卧式釜型U形管式换热器,管程为高压系统。氨和二氧化碳在列管中发生反应,生成甲铵,同时放出大量的热,热量被低压壳侧沸腾着的水吸收,产生0.34MPa的低压蒸汽,供系统使用。1发现问题高压甲铵冷凝器(E-104)自1990年开 相似文献
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1 故障经过中原大化集团有限责任公司尿素装置高压甲铵冷凝器 (E1 0 4 ) ,由意大利新比隆制造 ,是一个卧式釜型U型管式换热器 ,管程是高压系统 ,氨和二氧化碳在列管中反应生成甲铵 ,同时放出大量的热量 ,热量被低压壳侧沸腾着的水吸收 ,产生0 .34MPa的低压蒸汽 ,供系统使用。自 1 990年开始投用 ,运行至 1 998年 8月大修时涡流探伤发现1— 8管缺陷 ,堵管 ;1 999年 9月大修时涡流探伤发现 4— 2 6管缺陷 ,堵管 ;2 0 0 1年 8月 2 2日利用合成停车机会检查发现 31— 47管泄漏 ,堵管后 ,投用不到一天又开始泄漏 ,蒸汽中氨含量达 2 0 0× 1 0 … 相似文献
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The energy-dispersive spectroscopy (EDS), X-ray diffraction analysis (XRD) and differential thermal analysis (DTA) were used to analyze the melting, spreading process, and reaction mechanism of non-corrosive flux on the surface of aluminum. The result indicates that the whole process can be divided into three stages. In the first stage, flux is heated from room temperature to its melting point, which is called the endothermic stage, mainly absorbs heat and generates a small amount of liquid flux. When the temperature exceeds the melting point of flux, a large amount of liquid flux is generated and reacts with oxide films on the surface of aluminum. This stage is called the reaction stage. The third stage is a spreading and cleaning process, in which residues and reaction products quickly flow out from the center with liquid flux. The different compositions of flux perform different functions in brazing. K3AlF6 can remove oxide film as a cleaner. Only in liquid or molten state can flux remove oxide film on the substrate. 相似文献
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