The invention discloses a
latent heat recoverable multi-
phase change sludge drying method and a
latent heat recoverable multi-
phase change sludge drying device, which are designed for solving the technical problems that the
energy consumption is high, the
latent heat of the
sludge vapor cannot be recovered and reused, the dried
tail gas pollutes the environment, the
operating cost is high and the like in the conventional sludge
drying technology. Due to the combination of a low-temperature vapor turntable dryer, a sludge waste vapor latent heat recover
heat pump and a
tail gas purification device, and the use of indirect
phase change heat exchange for low-temperature vapor, the heat exchange is improved, and the loss of organic components of the sludge is low. The latent heat of the sludge drying
tail gas is recovered by using the latent heat recover
heat pump, and the recovered
heat energy is reused for sludge drying. Therefore, the heat efficiency is improved, the
operating cost is reduced, and the problems that the heat utilization ratio is low, the
operating cost is high and the like in the sludge drying process are better solved. The dried products meet the requirement of baking light and energy-saving bricks and producing
cement laminated products, and over 90 percent of heat value of the original sludge is maintained. Therefore, the
resource utilization value of the sludge is maximized.