| 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 |
