目的研究氮封拱顶化工储罐“大小呼吸”过程中的职业危害特征。
Objective To study the occupational hazards characteristics in the process of big and small breathing loss on nitrogen sealed vault tank.
建议更换同批管件，并应加强物料脱水工艺管理，停工期间对管道应进行氮封保护。
It is suggested that the pipe fittings be replaced in addition to the strengthened management of dewatering of process streams and nitrogen protection of the pipelines during the shutdown.
中石化南京某分公司加氢裂化原料罐区氮封系统多年来存在着氮耗量大、氮封效果差的问题。
The nitrogen-protecting system of the material tank farm for hydrogen-cracking-unit in one of Nanjing branch of Sinopec was unsatisfied in the protecting effect and more nitrogen-consuming.
封氮储存可明显抑制沥青质的增长。
The presence of nitrogen inhibits the increase of asphaltenes in slurry oil.
结果表明，对于同一封育年限的油松林地，土壤有机质、硝态氮、速效磷和脲酶含量随采样深度增加而减小；
The results show that in the same H & A, with depth of soil increasing, contents of organic matter(OM), NO-3-N, available phosphor(AP) and urease decreased respectively.
结果表明，对于同一封育年限的油松林地，土壤有机质、硝态氮、速效磷和脲酶含量随采样深度增加而减小；
The results show that in the same H & A, with depth of soil increasing, contents of organic matter(OM), NO-3-N, available phosphor(AP) and urease decreased respectively.
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