The flow and temperature distributions of coke oven gas (COG) in the salt-bath structure heat exchanger were investigated by numerical simulation and actual dynamic test. The variations of the temperature in the heat exchanger and the velocity of COG were obtained. The results showed that the COG was in the entrance region of laminar flow. The temperature of COG decreased sharply near the inner cylinder wall and the straight fins which welded on the wall

and the temperature gradient was small in the center of the heat exchanger along the radial direction. The temperature of the straight fins presented the higher tendency at the bottom and lower at the upper part along the axial direction

higher at the fin-top and lower at the fin-root along the radial direction at the same height. The temperature of inner cylinder wall in the heat exchanger could be controlled during the test

which could avoid a large amount of condensation from tar vapor in COG.