| 摘要 |
PROBLEM TO BE SOLVED: To recover waste heat from exhaust gas involving a large quantity of water, and hence improve a heat transfer coefficient of a heat transfer surface in a heat exchanger and further suppress a corrosion phenomenon of a heat transfer pipe. SOLUTION: An exhaust gas waste heat recovery heat exchanger comprises a trunk structure 1 including on an upper portion thereof an exhaust gas exhaust outlet 8 communicated with a flue, including therein heat exchange heat transfer pipes 2, 2... and a water droplet removal filter 4, and including in a bottom thereof a porous plate 3, and comprises an outer trunk structure 1a including a bottom thereof communicated with the trunk structure 1 and including in a side thereof an exhaust air stream inlet 6 communicated with a boiler. In the heat exchanger, a water pool layer is formed in the trunk structure 1 and in a bottom layer portion of the outer trunk structure 5, and the water is pushed up to the heat exchange heat transfer pipes 2, 2... with the aid of exhaust gas to form a water fluidized layer. Further, a bypass pipe 8 is coupled with an upper portion of the outer trunk structure 1a for directly feeding part of the exhaust gas flowing from the exhaust air stream inlet 6 to the exhaust gas exhaust outlet 8, and further for joining high temperature exhaust gas to the exhaust gas brought into a water saturated state after passage through the water fluid layer and the water droplet removal filter 4, and reheating those gases and feeding them to the flue. |
