Online cleaning system and method for scaling of catalytic range hood

The invention discloses a catalytic range hood scaling online cleaning system and method, and relates to the technical field of petrochemical engineering, the system comprises a flue gas energy recovery device, a three-screw fine powder injection device and a double-acting slide valve, the three-screw fine powder injection device sequentially comprises a fine powder storage tank, a storage tank bottom valve, a sight glass and a flue wall valve according to a pipeline, the flue gas energy recovery device sequentially comprises a three-screw, an inlet butterfly valve, a range hood and an outlet butterfly valve according to a pipeline; the other path of the three-screw flue gas outlet is communicated with the double-acting slide valve, the three-screw inlet is communicated with a regenerator, and the outlet of the double-acting slide valve and the outlet of the outlet butterfly valve are combined and communicated with a subsequent flue gas waste heat boiler system. The device has the beneficial effects that the