Comprehensive treatment system and method of sludge

Abstract

The invention discloses a comprehensive treatment system and method of sludge. The comprehensive treatment system of the sludge comprises a drying device, a gas-liquid separation device, a first dry distillation device, a second dry distillation device and a mixed gas reuse device, wherein the gas-liquid separation device comprises a dry cold flue gas inlet, a first mixed gas inlet, a separated gas outlet, a water outlet and a tail gas outlet; the first dry distillation device comprises a first sludge inlet, a first dry distillation hot flue gas inlet, a first sludge outlet, a first dry distillation flue gas outlet and a second mixed gas outlet; the second dry distillation device comprises a second sludge inlet, a second dry distillation hot flue gas inlet, a second dry distillation cold flue gas outlet and a pyrolytic carbon outlet; the mixed gas reuse device comprises a second mixed gas inlet, a vapor outlet and a pyrolysis gas outlet. The comprehensive treatment system of the sludgecan perform two-stage dry distillation treatment after to-be-treated sludge is dried, so that a high-quality dry distillation product can be obtained. Meanwhile, a high-temperature medium produced inthe system can be reasonably distributed, , and therefore, the thermal efficiency of the system is improved and energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of harmless treatment and resource utilization of sludge, in particular, the invention relates to a comprehensive sludge disposal system and method. Background technique [0002] Sludge pyrolysis is a process of decomposing organic matter in sludge to produce pyrolytic carbon, pyrolysis gas and trace tar in an anaerobic atmosphere. It has the advantages of harmlessness and thorough reduction, environmental friendliness and high degree of resource utilization. . The pyrolytic carbon (or biochar) obtained by sludge pyrolysis has more micropores and specific surface area, and contains high fixed carbon content and rich N, P, K and other nutrients, and has good water retention and slowing down. The effect of releasing and increasing soil fertility, the potential of soil resource utilization is huge. However, the high water content in sludge leads to high energy consumption in the sludge pyrolysis process, and ...

AI Technical Summary

Problems solved by technology

However, the high water content in the sludge leads to high energy consumption in the sludge pyrolysis process, and the process of sludge pyrolysis biochar for soil remediation needs further improvement

[0003] At the same time, the separation of tar and water produced by sludge pyrolysis is difficult, and the recovery cost is high. If it is directly discharged into the sewage pipeline, it will have a great impact on the subsequent sewage treatment, especially in the membrane sewage treatment process, which is easy to cause damage to the membrane. damage

Therefore, the existing sludge treatment methods still need to be improved

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