Energy-saving sludge drying treatment system

Abstract

The invention discloses an energy-saving sludge drying treatment system. The system comprises a vacuum heating unit, an incineration unit, a vacuum cooling unit and a fused salt heat exchange unit, the vacuum cooling unit comprises a high-temperature gas inlet, a condensed water outlet, a low-temperature gas outlet, a low-temperature liquid inlet and a medium-temperature liquid outlet, and the high-temperature gas inlet of the vacuum cooling unit is communicated with the vacuum heating unit; the incineration unit comprises an incinerator, an incineration gas inlet, a combustion-supporting gasinlet flue gas exhaust port, a cold molten salt inlet and a hot molten salt outlet, and the incineration gas inlet is communicated with the low-temperature gas outlet of the vacuum cooling unit; the molten salt heat exchange unit comprises a cold molten salt outlet, a hot molten salt inlet, a medium-temperature liquid inlet and a high-temperature liquid outlet; wherein the cold molten salt outletis communicated with the cold molten salt inlet of the incineration unit, the hot molten salt inlet is communicated with the hot molten salt outlet of the incineration unit, the medium-temperature liquid inlet is communicated with a medium-temperature liquid outlet of the vacuum cooling unit, and the high-temperature liquid outlet is communicated with the vacuum heating unit.

Description

technical field [0001] The invention relates to a sludge treatment system, in particular to a sludge drying treatment system. Background technique [0002] Sludge is the solid sediment produced in the process of water and sewage treatment. It can also be considered as sediment, particulate matter and floating matter produced when wastewater is treated by physical, chemical, physicochemical and biological methods. An extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc. The main characteristics of sludge are high water content (up to 99%), high content of organic matter, easy to rot and smell, and the particles are finer, the specific gravity is smaller, and it is in a colloidal liquid state. [0003] In the existing sludge drying process, the direct contact area between the internal sludge and the hot air is small, resulting in a slow drying speed of the sludge. Secondly, when the water in the sludge is evapora...

AI Technical Summary

Problems solved by technology

However, the sludge drying incineration system and its incineration process have the following disadvantages or deficiencies: (1) The preheater and the sludge drying bed require a large amount of heat energy provided by the outside; (2) The waste heat energy of the waste gas is not fully utilized

However, the disk sludge drying system based on energy cascade utilization has the following disadvantages or deficiencies: (1), the disk drying system requires extremely high temperature hot steam for sludge drying, and energy is consumed during sludge drying (2) The toxic and harmful gases in the exhaust gas from the dried sludge are not effectively separated

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