Online circulation cleaning device for anti-corrosion flue gas waste heat exchanger

The utility model discloses an online circulation cleaning device for an anti-corrosion flue gas waste heat exchanger, and belongs to the technical field of energy saving in flue gas waste heat recovery. The online circulation cleaning device is formed in a way that a cleaning agent spray device, a cleaning agent and ash collecting and separating device, a heat exchanger running and cleaning function switching baffle plate and a cleaning agent circulating pump are connected by adopting pipelines. Due the adoption of an integrated design, a complete set of cleaning devices and a heat exchange device are integrated into a whole. The heat exchanger running and cleaning function switching baffle plate can be manually or automatically controlled, manual or automatic switching of two modes of flue gas waste heat recovery running and flue gas heat exchanger cleaning can be realized, ash on the surface of the heat exchanger can be removed by utilizing a liquid cleaning agent under the situation that a heat exchanger main body and attached pipelines are not needed to the disassembled, the removed ash can be collected and separated through an ash hopper, the liquid cleaning agent can be recycled, and a disassembly-free online cleaning mode can be realized.