GGH heat exchanger on-line flushing device

The utility model discloses an on-line flushing device for a GGH heat exchanger, which relates to the technical field of flushing devices and comprises a GGH shell, a high-temperature flue gas inlet is arranged on the rear side of the GGH shell, a low-temperature flue gas outlet is arranged on the front side of the GGH shell, a low-temperature flue gas inlet is arranged on one side of the GGH shell, and a high-temperature flue gas outlet is arranged on the other side of the GGH shell. A plurality of heat exchange tubes are arranged in the GGH shell at equal intervals, and a cleaning device is arranged above openings of the heat exchange tubes. High-temperature flue gas exchanges heat with low-temperature flue gas in the process of flowing from top to bottom, dirt such as salt in the flue gas is mostly condensed in a low-temperature area at a lower tube opening of a tube pass, and the heat exchange tubes are arranged in the GGH shell at equal intervals. The cleaning operation area of the cleaning system is arr