| 摘要 |
A heat exchanger for cooling hot crude gas containing aggressive components and for heating the pure gas obtained from the crude gas has a housing (1) formed by two lateral walls (2, 3) and upper and lower tubular bottoms (4, 5) . Partitions (8, 9) are linked to the lateral walls (2, 3) in order to form an inner cavity. In the upper and lower tubular bottoms (4, 5) are inserted the ends of a plurality of mutually parallel exchanger tubes (10) that extend parallel to the lateral walls. The hot crude gas flows through the exchanger tubes (10) and the pure gas flows through the housing (1) transversely to the exchanger tubes (10). The invention should ensure that the lateral walls of the heat exchangers are better protected against corrosion. For this purpose, an underpressure is applied to the cavities (6) formed between the lateral walls and the partitions, and the noxious gases of the pure gas that diffuse through the partitions into the cavities are fed by a duct into the stream of pure gas. Alternatively, an overpressure can be applied in the cavities formed between the lateral walls and the partitions. |
