| 摘要 |
<p>Purifying a gas stream by condensing and/or freezing out impurities by passing the gas stream successively through two heat exchangers in thermal contact with a coolant comprises heating the coolant before supplying it to the first heat exchanger. An independent claim is also included for apparatus for purifying gases, comprising a first heat exchanger (2) with a gas inlet (4), a gas outlet (5), a coolant inlet (17) and a coolant outlet (18), a second heat exchanger (3) with a gas inlet (6), a gas outlet (7), a coolant inlet (13) and a coolant outlet (14), and a heater (25) for the coolant supply to the first heat exchanger and/or a heater (27) for the gas stream leaving the first heat exchanger.</p> |
