Multi-temperature particle heat source drying device and method

The invention provides a drying device and method. According to the drying device and method, one or more different-temperature particle heat carriers serve as heat sources and are sequentially added into a fluidized bed in a segmented mode to dry substances such as sludge. The problems that a current device and method for drying the substances such as the sludge are complex and high in running cost are mainly solved. All the heat sources of the drying device come from the particle heat carriers, most of the heat for heating the particle heat carriers is provided by the heat generated in a burning hearth in the burning process, and particles can be heated by the heat to be higher than 600 DEG C to be high-temperature particle heat carriers; a small amount of the heat is obtained by heat exchange with exhaust gas leaving the hearth, the temperature of the particles is lower than 600 DEG C, and the particles are the medium-temperature particle heat carriers. Due to changes in heat carrier media, the heat transferring process and the mass transferring process which are required by drying the substances such as the sludge are enhanced; the device structure is simplified; the device investment and the running cost are remarkably reduced.