Design of an agitator in the anaerobic digester for mixing of biomass slurry
| Autor: | Alok Kumar, Anand Ramanathan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Hydraulic motor Stuffing box 02 engineering and technology 021001 nanoscience & nanotechnology Pulp and paper industry 01 natural sciences Substrate concentration Agitator Anaerobic digestion Homogeneous 0103 physical sciences Slurry Environmental science 0210 nano-technology Anaerobic exercise |
| Zdroj: | Materials Today: Proceedings. 46:9678-9682 |
| ISSN: | 2214-7853 |
| DOI: | 10.1016/j.matpr.2020.08.011 |
| Popis: | Anaerobic digestion is a process through which degradation of biomass can be accomplished. This degradation is generally carried out in anaerobic digester. The digester for anaerobic digestion purpose requires agitation in order to achieve the uniform dispersal of biomass slurry. Agitation provides uniformity in temperature substrate concentration, and different environmental factors. Moreover, agitation also helps in preventing the deposition of solid at the bottom of the anaerobic digester. So, the agitation of biomass slurry provides biological, chemical and physical uniformity in the anaerobic digester. The main aim of this paper is to design an agitator for a small portable anaerobic digester in order to minimize scum formation and stratification during the anaerobic digestion process. This design of an agitator for a small portable anaerobic digester can be helpful in homogeneous mixing of various types of biomass slurry. This paper provides the theoretical design of agitator having straight blades attached with a hub. The design of an agitator in anaerobic digester is carried out with the concept of Reynolds number as well as using experimental relation provided by Dave and John. The selected number of the straight blade is six. The calculated power is 20 W and 25 W, while assumed power for designing the agitator is 100 W. The calculated shaft diameter is 13.02 mm while hub diameter and hub length are 26.04 mm and 32.55 mm respectively. Further, internal diameter of stuffing box is 16.62 mm and thickness of stuffing is 6.0014 mm. The motor used in the design is hydraulic motor because it is convenient to mount directly on a vertical shaft which eliminates the need for gearboxes. This hydraulic motor can also provide a wide range of speed. The power transmission efficiency for the motor is considered as 95% and gland loss is 5%. |
| Databáze: | OpenAIRE |
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