The utility model relates to a heat energy conversion reduces discharging technical field, specifically indicates a device is used multipurposely to annealing kiln waste heat, including outer air exit, heat exchanger, steam cylinder and the generator of annealing kiln, the entry end and the outer air exit of heat exchanger are connected, are equipped with the fan on the exit end of heat exchanger, are connected with a plurality of heat exchange tubes on the steam cylinder and set firmly in the heat exchanger, during installation, be equipped with the moisturizing storehouse on the steam cylinder, the moisturizing storehouse is connected with outside water source, and is equipped with the check valve between steam cylinder and the moisturizing storehouse, the utility model discloses rational in infrastructure, hot type wind gets into the heat exchanger internal heating, and the output of high -pressure steam makes turbofan work and drives generator generate current stores, and the vapours can be collected by vapours application apparatus once more and utilized to effectively improving energy efficiency reduces the hot driving.