Sludge drying system based on gradient utilization of energy

Abstract

The invention relates to a sludge drying system based on gradient utilization of energy. The sludge drying system comprises a disc drying system and a pressing filtration drying system, wherein the disc drying system comprises a shell, a stirring shaft is installed in the shell, disc sheets are separately installed on the stirring shaft, the top of the shell is provided with a sludge inlet and a vapor outlet, the bottom is provided with a dried sludge outlet, the stirring shaft is driven by a motor at one end, the stirring shaft is of a hollow structure, one end of the stirring shaft is a heat vapor inlet, and a condensated water export tube is inserted on the end. The pressing filtration drying system comprises a pressing filtration system, a sludge feed system connected with the pressing filtration system, a vacuumizing system, a heat water circulating system, and a sludge output system, wherein the sludge feed system is connected with a sludge feed end of the pressing filtration system, the sludge output system is connected with a sludge discharge end of the pressing filtration system, the vacuumizing system is used for keeping the pressing filtration system to be at a negative pressure state when the pressing filtration system presses and filters the sludge, and the heat water circulating system is connected with the vapor outlet of the disc drying system.

Description

technical field [0001] The invention relates to the field of sludge treatment equipment, in particular to the technical field of sludge drying, in particular to a sludge drying system based on energy cascade utilization. Background technique [0002] A large amount of sludge will be produced after urban domestic sewage treatment. If the sludge cannot be treated in a timely, effective and stable manner, it will bring great hidden dangers to the urban environment and the safety of people's lives. In addition, industrial processes such as papermaking, chemical industry, tanning, printing and dyeing, and dredging of rivers and lakes will also produce a large amount of sludge. [0003] The reduction and harmlessness of sludge has become a major environmental protection problem that must be solved in the process of urban scientific development. The moisture content of the sludge produced in the sewage treatment plant is still as high as 80% after dehydration, and the volume and q...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the low energy utilization rate of the existing sludge drying system and the disc-type sludge drying equipment, after a long period of research, the applicant found that there is still a fatal shortcoming in that the disc dryer is of high temperature (100 -180°C), high dust (dust generated by sludge drying and rotating propulsion, dry sludge dust is combustible) air environment, and in a frictional state, there is a greater risk of explosion. Therefore, the present invention provides an energy utilization rate Sludge drying system based on energy cascade utilization with high safety and high performance

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