| 摘要 |
A method of treating an air stream that is contaminated with organic substances, comprising irradiating the contaminated air stream with UV-light emitted from UV-lamps, wherein the UV-lamps have a given length of life (T1) which is determined by the decrease of the set UV-radiation in accordance with a first function (F1) from a starting state when setting the method into operation (E1) to a smallest theoretically acceptable value (E2). The UV-lamps shall be cleaned at a time interval (T2) that is determined by the reduction of the actual set radiation to a smallest desired value (E3). The lamps are cleaned at time intervals (T2) calculated with the aid of-the value of the UV-radiation at the initial starting state (E1),-the value of the smallest desired actual UV-radiation (E3),-the first function (F1) for reduction of the UV-radiation during the working period (T); and-a second function (F2) for reducing the UV-radiation due to dirtying of the UV-lamps. |
