Furnace bottom waste heat recovery device

The utility model discloses a furnace bottom waste heat recovery device which comprises a furnace body, a lower collecting box and a connecting rod, and a feeder is installed on one side of the furnace body. And the bottom of the lower header is connected with the furnace body. According to the boiler bottom waste heat recovery device, the lower collecting box, the annular collecting box and the membrane type wall pipe are installed at the bottom of the boiler body, an independent water circulation system is formed on the lower portion of the hearth, a certain amount of boiler radiant heat and ash heat energy are absorbed, and therefore the slag discharging temperature of the boiler body is reduced, and the production capacity of the boiler body is improved; the high-temperature ash can fall on the membrane type wall pipe when falling on the boiler, the membrane type wall pipe absorbs high-temperature heat energy of the high-temperature ash through circulating cold water, and therefore coke slag is prevented