Combined stirring means and apparatus in high solid anaerobic digestion biogas production

Abstract

The invention discloses a combined stirring method and a device in the production of high-solid anaerobic digestion marsh gas. The lower part of the wall of a cylindrical closed reactor is provided with a radial stirrer and a tangential stirrer; four to twenty sand pipes are connected with the wall of the reactor and tightly adhered to the bottom side of the reactor equantly; the upper part of the wall of the reactor is connected with a feeding pipe; the bottom of the reactor is connected with a large discharge pipe. A material in-and-out cycle is divided into two stages, in which the material is stirred tangentially and radially; after being fed in, the material is stirred in the radial direction, and then in stirred in the tangential direction, so that the sand is collected around the bottom of the reactor under the centrifugal effect; next, the sand pipes are opened, the sand is discharged as the jet flow formed by the centrifugal effect, and the material discharge and sand removal are completed at the same time; the sand pipes are then closed, the tangential stirring is stopped, the material is fed in, the two stirring methods are used alternately in a circulating way to form two different stirring flow fields which mutually remove stirring dead corners, prevent the material from incrusting and the sand from accumulating, so as to ensure the stably operation of the system. The invention is mainly used in producing marsh gas.

Description

technical field [0001] The invention relates to a biogas production method, in particular to a combined stirring method and device for high-solid anaerobic digestion biogas production. Background technique [0002] Stirring and shell breaking are the key links in the process of high solids anaerobic digestion to produce biogas. When the solid concentration exceeds 10%, the completely mixed anaerobic reactor (CSTR) is an ideal choice. The energy consumption required for stirring is one of the main operating costs of the complete mixing anaerobic digestion process, so adopting energy-saving and efficient stirring methods is an effective way to reduce system operating costs. At the same time, stirring also directly affects the anaerobic digestion effect of solid materials. In a reactor, the uniform distribution and close contact of solid materials and functional microorganisms are the necessary basis for efficient anaerobic digestion. At present, a single stirring method is ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a combined stirring method and device in the production of biogas from high-solid anaerobic digestion, so as to solve the problem that there is a single stirring mode in the high-solid anaerobic digestion biogas production process, so that the material utilization rate is low and the material is easy to be on the liquid surface. Crust hardening, lack of sand removal function and sand accumulation in the reactor and other technical problems

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