| 摘要 |
A thermal postcombustion device (1) comprises, in a conventional manner per se, a housing (2, 3, 4), which comprises an inlet (28) for the exhaust air that is to be purified and an outlet (29, 30) for clean air. A combustion chamber (11) is located inside the housing (2, 3, 4), and inside this combustion chamber, a heating device (9) generates a temperature at which the pollutants carried by the exhaust air burn. In order to reduce the energy requirement, a heat exchanger (50a, 50b) is provided over which the exhaust air coming from the inlet (28) is guided to the combustion chamber (11), and the clean air coming from the combustion chamber (11) is guided to the outlet (29, 30). In order to also be able to process exhaust air, which is loaded with adherent residues, for example, pitch vapors, a device (33 to 38) is provided with which, during a purification mode, at least a portion of the clean air can be optionally fed past a section (50a) of the heat exchanger (50a, 50b) located closer to the combustion chamber (11) and into another section (50b) of the heat exchanger (50) located further from the combustion chamber (11). Deposits, which have formed in the vicinity of the cold end of the heat exchanger (50a, 50b), can be removed in this manner, particularly oxidized.
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