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2. 发明授权

EP2285739B1 SPERRUNG DES NO-KOMPRESSORS UND DES RESTGASEXPANDERS IN EINER SALPETERSÄUREANLAGE 有权转让
标题翻译：无压缩机阻塞和气体膨胀的REST在硝酸厂
公开(公告)号：EP2285739B1
公开(公告)日：2012-07-04
申请号：EP09757168.1
申请日：2009-05-15
申请人： ThyssenKrupp Uhde GmbH
发明人： MAURER, Rainer , BIRKE, Daniel , JOCHMANN, Egon
IPC分类号： C01B21/28 , C01B21/40
CPC分类号： C01B21/28
摘要： Method for sealing the NO compressor (3) and the residual gas expander (11) in a plant for producing nitric acid by the dual pressure process, containing a low-pressure part (1), an NO compressor (3), wherein the shafts of the NO compressor (14, 15) are sealed from the gas-bearing parts by means of at least 2 sealing chambers, a high-pressure part with oxidation and absorption (5), at least one heat exchanger (7), a residual gas expander (11), wherein the shafts of the residual gas expander (12, 13) are sealed from the gas-bearing parts by means of at least 2 sealing chambers, and the sealing chambers all have labyrinth seals. In this method ammonia and compressed air are passed into the low-pressure part (3) of the nitric acid plant and there ammonia is oxidized to NO and water by means of a catalyst, and the resultant NO is in part oxidized to NO
2 . The resultant NO- and NO
2 -saturated gas (2) is passed into the NO compressor (3), the compressed NO- and NO
2 -saturated gas (4) is passed into the high-pressure part (5) of the nitric acid plant where an oxidation of the remaining NO to NO
2 proceeds, followed by an absorption of nitrogen dioxide to give nitric acid, the residual gas of the high-pressure part (6) is passed via at least one heat exchanger (7) into the residual gas expander (11), wherein the first sealing chamber (22) is situated in each case next to the gas-bearing rotor (27) of the compressor (3) or the expander (11), a part of the residual gas (8) is taken off downstream of the heat exchanger (10) and divided into 2 substreams (17, 21) of which the first substream (21) is passed into the respective first sealing chambers (14, 15) of the NO compressor (3), and of which the second substream (17) is passed into the respective first sealing chambers (12, 13) of the residual gas expander (11), and the majority of the residual gas of the substreams, owing to the higher pressure level, passes through the labyrinth seal (25) separating the gas-bearing rotor (27) from the first sealing chamber (22) to the gas-bearing rotor (27), and the residual gas (18 or 19) passing, owing to leaks of the labyrinths, from the respective first sealing chamber (22) into the respective second sealing chamber (23) into the exhaust gas stream (20) of the residual gas expander (11).

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