Compression feed screws are commonly used in biorefineries for the continuous feeding of biomass feedstock into reactors. Developing methods to assess the feasibility of feeding granular materials in a compression feed screw is critical for reducing solids handling issues during operation. A laboratory-scale compression feed screw has been built to measure …

measurements in the gasification reactor. The validated model is further used to investigate the feed rate with different combinations of transport screw parameters and the results are compared and discussed. Keywords: Biomass, Screw Feeder, Open-source LIGGGHTS, CPFD, Simulation 1. Introduction Feeding the biomass to the gasification reactor ...

Here, in this work, we developed a predictive computational model for biomass screw feeders that capture the highly viscous, non-Newtonian and compressible behavior of biomass slurries. Biomass compressible behavior is formulated by an equation of state and the non-Newtonian rheology is represented by a density-dependent viscosity model.

Most of the researches have focused on the screw performance while much less on the screw and the mechanistic of material properties. Metcalf (Metcalf, 1965) theoretically analyzed the conveying volume and torque required for screw feeders.To verify the reliability of the torque model, the coal was used as experimental material to investigate the effects of …

DOI: 10.1016/j.ces.2023.119117 Corpus ID: 260324769; Simulations of biomass compression-screw feeding using a compressible non-Newtonian constitutive model @article{Rahimi2023SimulationsOB, title={Simulations of biomass compression-screw feeding using a compressible non-Newtonian constitutive model}, author={Mohammad J. Rahimi and …

In this work, we developed a predictive computational model for biomass screw feeders that capture the highly viscous, non-Newtonian and compressible behavior of biomass slurries. …

Physical experiments and discrete element model (DEM) simulations are conducted to evaluate particle characteristics and operation parameter effects on screw feeding performance for rotary shear ...

Two parameters are employed in this model to describe stress in screw pockets in the hopper and to analyze compression in the choke section. The model extends previous models by considering effects of all boundaries on torque, and allowing for compression in the choke section. ... aimed to understand the mechanism of biomass screw feeding and ...

three-dimensional model that simulates the feeding of biomass by a pilot-scale screw feeder. The governing equations are continuity, @⇢ @t + r · ⇢u =0, (1) and conservation of momentum, @ @t (⇢u)+r · ⇢uu = rP + r · . (2) Here, ⇢ represents the overall biomass density, u is the velocity field, P is the pressure, and is the stress ...

DEM simulations were conducted to simulate the mixed feeding process of coal and cylindroid biomass particles in a screw feeder with the coal particles being treated as a spherical shape, while the cylindroid biomass particles being constructed by the multi-sphere model (MSM). The feeding ratio of cylindroid biomass particles, feeding rate and ...

Dai, J., & Grace, J. R. (2008). A model for biomass screw feeding. Powder Technology, 186(1), 40–55. doi:10.1016/j.powtec.2007.10.032

Biomass screw feeders operate in a manner similar to piston feeders, but have a somewhat lower pressurization range (0.5–1.5 MPa). In a screw feeder, an auger compresses the feedstock into a compact plug, aided by tapering the feed channel, or by gradually reducing the pitch of the screw.

A model for biomass screw feeding. Powder Technol. (2008) F.J.C. Rademacher Some aspects of the characteristics of vertical screw conveyors for granular material. Powder Technol. ... Mass flow and variability in screw feeding of biomass powders — Relations to particle and bulk properties. Powder Technology, Volume 276, 2015, pp. 80-88.

Successful feeding is critical to biomass utilization processes, but difficult due to the heterogeneity, physical properties and moisture content of the particles. The objectives of the present study were to find the mechanisms of blockage in screw feeding and to determine the effects of particle mean size (0.5–15 mm), size distribution, shape, moisture content (10–60%), …

Dai, J.J. and Grace, J.R., "A model for biomass screw feeding," Powder Technology, 186, 40-55, 2008. has been cited by the following article: Article. ... The results show that the stress concentration is at the root of screw blades; the screw blades with the thickness of 10 mm, whose service life is around 35 years, are the optimum in ...

The specific model of the screw feeder system was developed and validated in the previous studies [5,23,24,31]. This work takes a bin as the container and the system is shown in Fig. 1, including a flat bottom container (here referred to as the bin) and three different screws. ... The effects of biomass feeding ratio, feeding rate, and screw ...

Interest in biomass fuels is increasing worldwide to produce heat, power, liquid fuels and hydrogen with reduced greenhouse gas emissions. Thermochemical biomass processes are relatively well developed, e.g. for direct combustion, gasification and pyrolysis.However, critical problems often arise when attempting to feed biomass into reactors, preventing continuous …

a model for biomass screw feeding for the torque requirement of a screw feeder by considering the bulk solid mechanics of a material element within a pocket. Screw or piston operated plug feeders, common in feeding coal, have also been tested with biomass3-10. In screw feeders, lacks of flow is a common phenomenon and have serious solids ...

Simulations of Biomass Compression-Screw Feeding Using a Compressible Non-Newtonian Constitutive Model, Chemical Engineering Science (2023) Memory Access Optimization for Particle Operations in Computational Fluid Dynamics-Discrete Element Method Simulations, Particuology (2023)

1 1 Particle size and shape effect of Crumbler® rotary shear-milled granular 2 woody biomass on the performance of Acrison ® screw feeder: A 3 computational and experimental investigation 4 Ahmed Hamed a,, Yidong Xia †, Nepu Saha, Jordan Klinger. a, David N. Lanning. b, James H. 5 . Dooley. b. 6. a . Energy and Environmental Science & Technology Directorate, Idaho National …

Developed a new compressible non-Newtonian fluid flow solver in Open for biomass applications. The constitutive model and rheology parameters used in this model are derived …

Roberts [14], [15], Roberts and Manjunath [16], and Roberts [17] analyzed the volumetric characteristics and mechanics of screw feeders in relation to the bulk solid draw-down characteristics of the feed hopper. Distribution of throughput along screw and uniform draw-down patterns was investigated. Yu and Arnold [18] proposed a theoretical model for torque …

A model, extended from previous models in the literature, is proposed to delineate what limits screw feeding in terms of the mechanisms of blockage and to predict torque …

A new model is proposed to predict blockage and torque requirements of screw feeding of biomass materials. Predictions for wood pellets, sawdust, hog fuel and wood shavings in a screw feeder/lock hopper system are in good agreement with experimental findings. The choke section and seal plug are shown to play important roles in determining torque requirements.

We employ a single-fluid continuum approach to model the flow of biomass in the screw feeder. The biomass feedstock is treated as a single isothermal compressible non …

The article examines a method of loading biomass waste into a boiler unit, which ensures the gas tightness of the boiler's working chamber by forming a "plug" of biomass as it moves through the…

Biorefineries which seek to convert biomass into ethanol face many different challenges, and among them, mechanical failure of equipment is common. Unfortunately, the resulting downtime can significantly reduce the profitability and the viability of bioethanol plants. One important piece of mechanical equipment in this setting is the compression screw feeder, …

The present study developed a new theoretical model with consideration of compression, aimed to understand the mechanism of biomass screw feeding and to predict torque requirements to …

Semantic Scholar extracted view of "Biomass screw feeding with tapered and extended sections" by Jianjun Dai et al. Skip to search form Skip to main content ... On the base of analyzing the parametric design model of the screw feeder with variable diameter and screw pitches, a parametric design model of screw shaft was given in this paper. By ...

One of the main challenges in the operation of screw feeder is plugging and jamming of compressed biomass with high concentration of insoluble solids. The focus of this paper is to numerically investigate the screw feeder at these challenging operating conditions and help with the optimization of the screw feeder design to avoid operation failure.