The utility model discloses a coal industry hydrogasification equipment is with preventing that " grey bridge " forms structure, including waste heat boiler and over heater, waste heat boiler passes through high temperature connecting tube and over heater intercommunication, the shells inner wall of waste heat boiler, over heater and high temperature connecting tube is equipped with one deck integrated into one piece's dustproof heap breath protective layer. Lower extreme that dustproof piles the breath protective layer is the toper structure, its tapering >= 32. The inside whirl board that is used for the burble that is equipped with of waste heat boiler and over heater. The last center tube heat control valve that is provided with of waste heat boiler. Waste heat boiler still is equipped with the supersonic dust separation device outward. The over heater includes the shell, be equipped with the inner tube that supplies coarse coal gas to pass through in the shell. The utility model discloses the device can reduce each hookup location's of shells inner wall dead angle, prevents that the dust from piling up formation " grey bridge ".