Optimization of Screw Mixer to Improve Drying Performance of Livestock Manure Dryer Using CFD Analysis

Gunyoung Park,Hyoseo Kwak,Chul Kim,Taejin Eom

doi:10.3390/app12062872

Gunyoung Park, Hyoseo Kwak + Show 2 more

Open Access

https://doi.org/10.3390/app12062872

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Journal: Applied sciences	Publication Date: Mar 10, 2022
Citations: 2	License type: CC BY 4.0

Affiliation: Pusan National University, Dong-Eui University

Abstract

Scarcity of fossil fuels and their emissions of fossil fuel pollutants, such as carbon dioxide, into the atmosphere, and the resulting consequences, have led energy policymakers to look for alternative renewable and clean energy sources. The use of animal wastes is one of the very promising renewable energy alternatives paving the way for a more sustainable energy network. Animal manure produced by livestock farms has a moisture content of about 80%, and such livestock manure is dehydrated to a moisture content of 20–25% and solidified to be used as biomass and fuel for thermal power plants. Previous studies on manure dryers have been concentrated on convection-type dryers, but this type of dryer has the disadvantage of inadequate processing capacity per hour because it cannot agitate manure. In this study, to deal with the drawbacks of conventional livestock manure drying methods, a screw-type dryer was proposed. CFD analysis of the dryer was performed by selecting the viscosity of livestock manure and design parameters of the screw using Ansys Workbench. Through the response surface method, optimal design of the screw shape for the improvement of drying efficiency and smooth discharge of residual manure was carried out.

Highlights

Scarcity of fossil fuels and their emissions of fossil fuel pollutants, such as carbon dioxide, into the atmosphere, and the resulting consequences, have led energy policymakers to look for alternative renewable and clean energy sources
World trends toward the modern dairy intensification on large production units cause massive animal manure production and accumulation, which can be a source of contamination of land, water, and air
Animal manure is considered very attractive for the production of renewable energy since it is a natural resource that can replace industrial fertilizers and improve soil fertility [2–4]

Summary

Introduction

Scarcity of fossil fuels and their emissions of fossil fuel pollutants, such as carbon dioxide, into the atmosphere, and the resulting consequences, have led energy policymakers to look for alternative renewable and clean energy sources. World trends toward the modern dairy intensification on large production units cause massive animal manure production and accumulation, which can be a source of contamination of land, water, and air In this sense, there are many efforts to transform these wastes into clean and renewable energy, such as the use of anaerobic digestion to produce biogas. The oil-drying method, which is the method of rapidly evaporating moisture by using oils with a smaller specific heat capacity than water, needs continuous consumption of waste oil during the drying process If these conventional drying methods for livestock manure are used, manure is not sufficiently dried due to low drying performance, which causes odor, deteriorating the working conditions of workers and causing great inconvenience and annoyance to local residents. The livestock manure dryer with screw-type manufactured in the field

Configuration of the Screw-Type Dryer

Analysis Conditions

Findings

Analysis Parameters