Device for burner hearth heat transfer of circulating fluidized bed boiler

The utility model discloses a device for burner hearth heat transfer of circulating fluidized bed boiler, including preceding wall water-cooling wall, back wall lower part water-cooling wall, ceiling water-cooling wall, both sides wall water-cooling wall, its characterized in that: being equipped with in back wall lower part water-cooling wall top and expanding the water-cooling screen, expand the water-cooling screen including the water-cooling evaporation screen that sets up and be on a parallel with the back wall more than two along back wall width direction interval, every water-cooling evaporation screen is divided equally and is do not linked to each other with export collection case with the outer entry collection case of brickwork including several heat exchange tubes, the both ends of all heat exchange tubes, separator entry flue -Offset on each water-cooling evaporation screen and the back wall the utility model discloses can improve burner hearth cigarette temperature and distribute, regulation boiler soda side heat absorption proportion improves the boiler output, improves the feature of environmental protection ability of boiler and the security of operation