Sludge segmented heat drying system

The invention discloses a sludge segmented heat drying system which is characterized in that a high-temperature drying machine is respectively provided with a wet sludge inlet, a steam inlet, a dried sludge outlet, an evaporated waste gas outlet and a steam condensate outlet, and the dried sludge outlet is connected with a dried sludge inlet of a low-temperature drying machine; the low-temperature drying machine is respectively provided with a hot water inlet pipe, a hot water outlet pipe, a cold water outlet pipe, a cold water inlet pipe, a wastewater outlet pipe and a dry sludge outlet; the cold water inlet pipe and the cold water outlet pipe are respectively connected with a cooling water supply pipe and a water return pipe of the closed cooling tower; an evaporation waste gas outlet and a steam condensate outlet of the high-temperature drying machine are respectively connected with the waste heat recycling assembly, the waste heat recycling assembly is respectively provided with a hot water supply port an