Oil-making method of double-bed interactive and circling type for pyrolyzing sludge

Abstract

The invention provides a method for making oil by double bed cross circulation type pyrolysis of sludge, belonging to the energy environmental protection technical field. Between double beds of a fluidized bed pyrolysis reactor(1) and a fluidized bed combustion reactor(2), inert solid particle bed materials are used as heat carriers for the cross circulation, and the heat generated by pyrolysis carbon residues and incondensable gases burning in the fluidized bed combustion reactor(2) is transferred to sludge in the pyrolysis reactor as the heat source for the pyrolysis of sludge; a high temperature non-mechanical valve (3) is used to control the flow rate of the high temperature inert solid particle bed materials entering the pyrolysis reactor from the combustion reactor and further control the temperature of the pyrolysis reactor; the fluidized bed pyrolysis reactor(1) discharges excessive solid particle materials in the overflow mode, and the inert solid particle bed materials, the pyrolysis carbon residues and incondensable gases are transferred to the combustion reactor in the pneumatic transport mode; the wet sludge is dried by an internal heating type fluidized bed(16); and pyrolysis gases are condensed into oil-water mixture and incondensable gases in a spray tower(7).

Description

technical field [0001] The invention relates to a method for producing oil by pyrolysis of sludge, belonging to the technical field of energy and environmental protection. Background technique [0002] With the rapid development of sewage treatment, the by-product sludge of sewage treatment has also increased enormously, and the traditional sludge treatment methods have been questioned more and more by people. Sewage sludge is a heterogeneous body composed of organic debris, microorganisms, inorganic particles, colloids, etc. Sludge contains toxic organic matter, pathogenic microorganisms and heavy metals, which will cause serious harm to the environment. [0003] Traditional sludge treatment methods mainly include landfill, dumping into the sea, composting for agricultural use, and direct agricultural use. Pouring sludge directly into the sea can easily cause large-scale pollution of seawater. This method has been banned in many countries; landfilling is gradually becoming...

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Problems solved by technology

[0008] Technical problem: Aiming at the increasingly severe sludge treatment problem, the present invention proposes a double-bed interactive circulation sludge pyrolysis oil production method, which can solve the problems caused by sludge treatment in sewage plants, urban lakes and rivers. Environmental issues, and high value-added oil products can be obtained to achieve effective recycling of resources

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