Importance

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Abstract

, followed by absorption of nitrogen dioxide to nitric acid. The residual gas from the high-pressure section is routed to the residual gas expander via at least one heat exchanger. The shafts of the NO compressor are sealed by at least two sealing chambers against the gas-fed components and the shafts of the residual gas expander are sealed by means of at least two sealing chambers against the gas-fed components. All sealing chambers are provided with labyrinth seals, part of the residual gas is withdrawn downstream of the heat exchanger and subdivided into two partial flows, the first partial flow being passed into the respective first sealing chambers of the NO compressor, and the second partial flow being passed into the respective first sealing chambers of the residual gas expander, and the major part of the residual gas of the two partial flows reaches the gas-fed impeller through the labyrinth seal separating the gas-fed impeller from the first sealing chamber owing to the higher pressure level, and the residual gas escaping from the respective first sealing chamber into the respective second sealing chamber due to leaks in the labyrinth seals is passed into the off-gas flow of the residual gas expander.

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First Claim