Sludge pyrolysis recycling system and pyrolysis method

Abstract

The embodiment of the invention provides a sludge pyrolysis recycling system, which adopts solid porcelain balls or quartz sand as a heat carrier to rapidly transfer heat to sludge according to the material and pyrolysis characteristics of the sludge, and comprises a specially designed spiral pyrolysis reactor capable of achieving forced mixing and rapid heat transfer of the sludge. According to the invention, the solid heat carrier and the sludge are mixed and directly heated, compared with an indirect heating mode, the heat efficiency is high and the heating is uniform; spiral blades and stirring blades which are reasonably arranged in the pyrolysis reactor can achieve full mixing and rapid heat transfer of the sludge and the heat carrier, the pyrolysis reaction speed is high, the systemtreatment capacity is strong, the coking problem caused by uneven stirring of the sludge is effectively solved, and the long-term stable operation of the system is achieved; the waste heat flue gas is recycled to pre-dry the sludge, so that the energy grading utilization is achieved, the energy consumption can be effectively reduced, and the energy utilization efficiency of the system is improved. The embodiment of the invention also provides a method for pyrolyzing the sludge by adopting the sludge pyrolysis recycling system.

Description

technical field [0001] The invention belongs to the technical field of harmless and resourceful utilization of sewage treatment by-product sludge, and in particular relates to a sludge pyrolysis resource recovery system. The present invention also provides a sludge pyrolysis method using the sludge pyrolysis resource recovery system. Background technique [0002] Sludge is a by-product of sewage treatment production, and its composition is extremely complex. In addition to a large amount of water, it also contains nutrients such as nitrogen and phosphorus, heavy metals, and organic matter. If the sludge is directly discharged into the environment, it will cause environmental damage. Harmful, and the organic matter contained in the sludge is not utilized, which is a serious waste. The current sludge treatment technologies mainly include landfill, composting, dry incineration and pyrolysis. Among them, sludge pyrolysis is an important means of sludge resource utilization. S...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of uneven heating, low thermal efficiency, and insufficient system processing capacity in the existing sludge pyrolysis technology, and provides a new type of sludge pyrolysis reaction system and pyrolysis method, which adopts internal heat heating technology, Using solid heat carrier as the reaction heat transfer carrier, based on the optimized pyrolysis reactor design, it has the characteristics of uniform heating, high efficiency and low price, and easy industrialization

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