The product is mainly composed of skeleton, heat pipe packing plate, external components. Soft water walking jacket heat pipe and casing. The upper part of the flue gas go, header at the lower part of the heat pipe, heat pipe medium in the evaporation and condensation heat exchange is completed. Product features: 1 single point welding, heat pipe, heat pipe thermal expansion and contraction deformation is not constrained, avoid stress damage; 2, heat two fluid travel out of the tube, can fin; 3, heat pipe wall temperature controlled. Can effectively avoid the low-temperature dew point corrosion.