Method suitable for online cleaning and descaling of oxide absorption tower of MTO (Methanol To Olefins) device

The invention belongs to the field of coal chemical industry, and particularly relates to a method suitable for online cleaning and descaling of an oxide absorption tower of an MTO device. The method comprises the following steps: (1) injecting fuel oil into an oxide absorption tower, slowly injecting desalted water from the bottom of the oxide absorption tower, increasing the liquid level, and soaking trays with the fuel oil one by one; and (2) after soaking in a diesel oil solution, judging the cleaning degree of the tray by observing the water sample. According to the method, only a new temporary pipeline needs to be added, diesel oil is used for online cleaning of the oxide absorption tower of the MTO device, operation is convenient and fast, the use amount of the diesel oil can be adjusted according to the paraffin precipitation degree, and cost can be saved. Therefore, the wax in the tower is removed under the condition of not influencing normal production operation, the problem of poor washing effect o