Pure countercurrent plate type gas-gas heat exchanger

The utility model relates to a pure countercurrent plate type gas-gas heat exchanger. The pure countercurrent plate type gas-gas heat exchanger is characterized by comprising a box body, a heat exchange component arranged in the box body, an upper header arranged above the box body, a lower header arranged below the box body, and an expansion joint arranged between the heat exchange component and the upper header, wherein the lower end of the heat exchange component is connected with the lower header; the heat exchange component consists of a plurality of plate beam modules; the plate beam modules are constructed by symmetrically overlapping a plurality of heat transfer plate sheets; air runners A-A' and flue gas runners G-G' with parallel-enclosed plate sheets and opposite flow directions are formed on the plate beam modules. The heat exchanger has the advantages of high heat exchange efficiency, small floor area, uniform gas distribution, freeness from dead areas and low resistance.