Constant-pressure muggy gasification and pyrolysis conditioning method of sludge in sewage plant

Abstract

The invention discloses a constant-pressure muggy gasification and pyrolysis conditioning method of sludge in sewage plants, belonging to the technical field of sludge treatment for environment protection. In order to solve the problems of great operation pressure, high equipment requirement, low heat exchange efficiency and the like of the existing sludge conditioning technology, the invention discloses a constant-pressure muggy gasification and pyrolysis conditioning method of sludge in sewage plants. Under normal pressure, moist air (moisture percentage is 30-70%) of which the temperature is 200-900 DEG C is directly injected into sludge; after entering sludge, high-temperature air bubble rises in the form of a great amount of small air bubbles to directly contact and transfer heat anddoes not need a fixed heat transfer surface required by a dividing wall type heat exchanger, thus avoiding the influence of factors, such as crystallization, scaling and the like which hinder heat transfer. When the high-temperature air bubble in the sludge has the process of rapid cooling, the invention realizes local high-temperature atmosphere in the sludge at constant pressure, and the high-temperature environment accelerates sludge colloid to quickly break. The invention has the advantages of low operation pressure, high heat transfer efficiency and the like and has stronger application prospect in the sludge treatment field.

Description

technical field [0001] The invention relates to an atmospheric-pressure wet-heat aerolysis conditioning method for sewage plant sludge, in particular to an atmospheric-pressure wet-heat aerolysis conditioning method for urban sewage plant sludge and industrial wastewater treatment plant sludge, and belongs to the technical field of sludge treatment for environmental protection. Background technique [0002] As the country vigorously accelerates the pace of construction of urban sewage treatment facilities, the amount of sludge produced with sewage treatment has also increased sharply. Sludge contains a large amount of organic matter and is highly viscous, making it difficult to separate sludge from water. High water content and high organic matter content are notable features of sludge. Generally, the moisture content of gravity thickened sludge is about 98%, and the moisture content of mud cake after mechanical dehydration is still about 80%. The high moisture content brin...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of high operating pressure, high equipment requirements, discontinuous operation, and low heat exchange efficiency in traditional sludge thermal conditioning, the present invention provides a new sludge conditioning method based on direct gas-liquid contact heat transfer, which not only It can realize high-temperature cracking of sludge under normal pressure conditions, effectively improve the dehydration performance of sludge, and can also significantly improve the operating conditions of sludge thermal conditioning, which contributes to the realization of continuous operation of the process, the improvement of heat utilization rate, and the negative effects of fouling. Elimination of impact provides novel technical support

Since the operation is carried out under normal pressure, it can effectively avoid a series of problems caused by the high operating pressure of the traditional sludge hydrothermal treatment, and the heat transfer process is direct contact heat transfer, without the necessary fixing of the partition heat exchanger The heat transfer surface, thus avoiding the influence of crystallization, scaling and other factors that hinder heat transfer, can effectively avoid the problem of low system efficiency caused by scaling

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