| 摘要 |
1,134,840. Reactors. GUTEHOFFNUNGSHUTTE STERKRADE A.G. 17 Nov., 1967 [7 Dec., 1966], No. 52431/67. Heading G6C. In a process for removing contaminants from a cooling gas, e.g. helium, of a nuclear reactor plant, the gas is cooled before it enters an adsorption plant including activated charcoal filters by being adiabatically expanded in an expansion motor. A gas-cooled nuclear reactor plant has a relatively slight pressure gradient across the gas circuit if the gas heated in the reactor produces steam via a heat exchanger, and with such plant the energy obtained from adiabatic expansion of the gas is used to drive a compressor in which the expanded gas is recompressed after purification. In spite of the loss of energy incurred, the existing pressure gradient is sufficient to obtain the desired cooling effect if the cooling gas is first cooled in a pre-cooler in contra-flow with purified cooling gas to a temperature of 20 to 25‹ C. above the lowest temperature of the cooling gas within the adsorption plant. The latter temperature may be as low as -220‹ C. Where the pressure gradient across the gas circuit is relatively high, e.g. in a plant including a gas turbine, recompression of the purified gas may not be necessary and the mechanical energy obtained from adiabatic expansion of the cooling gas may be used in some other way. |
