scholarly journals Experimental Study of Entrainment and Mixing of Renewable Active Particles in Fluidized Beds

2020 ◽  
Vol 10 (12) ◽  
pp. 4268
Author(s):  
Botond Szucs ◽  
Mohamed Sobhi Alagha ◽  
Pal Szentannai
Keyword(s):  
Fluidized Bed ◽  
Fossil Fuels ◽  
High Mass ◽  
Experimental Facility ◽  
Low Velocity ◽  
Active Particles ◽  
Bottom Region ◽  
Refuse Derived Fuel ◽  
Mass Fractions ◽  
Opposite Tendency

Fluidized bed combustors were initially designed and built basically for the utilization of fossil fuels, mostly coal. The actual worldwide trend of transitioning from fossil fuels to renewables requires sufficient knowledge on the fluid mechanics of these new particle types because of the significant differences in their shapes, sizes, densities, and homogeneities. This article presents experimental results on the particle entrainment and mixing of some industrially relevant fuels such as solid refused fuel/refuse derived fuel (SRF/RDF), bark, sunflower shell, and wheat shell. The measurements were performed on a lab-scale fluidized bed experimental facility. The results show that sunflower shell is entrained in the highest degree; however, at very low velocity, the entrainment of wheat shell is the most intensive. The entrainment behaviors of the investigated SRF and bark samples are similar. On the other hand, the mixing results showed that the SRF has relatively high mass fractions in the bottom and centeral regions of the fluidized bed at low superficial velocities, while at elevated velocities, the entire mass of this fuel is shifted upwards. Interestingly, just the opposite tendency can be observed in cases of all other investigated biomass fuels. Finally, the nonspherical renewable active particles have markedly higher concentrations in the bottom region of the bed compared to spherical ones.

Response of Mild Steel Pipes Under High Mass Low Velocity Impacts

2014 ◽  
Author(s):  
Shamsoon Fareed ◽  
Ian May
Keyword(s):  
Finite Element ◽  
Mild Steel ◽  
Impact Energy ◽  
High Mass ◽  
Low Velocity ◽  
Element Analysis ◽  
Steel Pipes ◽  
Impact Tests ◽  
The Finite Element Analysis ◽  
The Impact

Accidental loads, for example, due to heavy dropped objects, impact from the trawl gear and anchors of fishing vessels can cause damage to pipelines on the sea bed. The amount of damage will depend on the impact energy. The indentation will be localized at the contact area of the pipe and the impacting object, however, an understanding of the extent of the damage due to an impact is required so that if one should occur in practice an assessment can be made to determine if remedial action needs to be taken to ensure that the pipeline is still serviceable. There are a number of parameters, including the pipe cross section and impact energy, which influence the impact behaviour of a pipe. This paper describes the response, and assesses the damage, of mild steel pipes under high mass low velocity impacts. For this purpose full scale impacts tests were carried out on mild steel pipe having diameter of 457 mm, thickness of 25.4 mm and length of 2000 mm. The pipe was restrained along the base and a 2 tonnes mass with sharp impactor having a vertical downward velocity of 3870 mm/sec was used to impact the pipe transversely with an impact energy of 16 kJ. It was found from the impact tests that a smooth indentation was produced in the pipe. The impact tests were then used for validation of the non-linear dynamic implicit analyses using the finite element analysis software ABAQUS. Deformations at the impact zone, the rebound velocity, etc, recorded in the tests and the results of the finite element analysis were found to be in good agreement. The impact tests and finite element analyses described in this paper will help to improve the understanding of the response of steel pipes under impact loading and can be used as a benchmark for further finite element modelling of impacts on pipes.

Fluidized-bed incineration of refuse-derived fuel pellets

1993 ◽  
Vol 7 (2) ◽  
pp. 273-278 ◽  
Author(s):  
S. C. Saxena ◽  
N. S. Rao
Keyword(s):  
Fluidized Bed ◽  
Fuel Pellets ◽  
Refuse Derived Fuel ◽  
Fluidized Bed Incineration

scholarly journals Experimental Studies on an Inclined Collector Divergent Chimney Pilot Plant

2021 ◽  
Vol 850 (1) ◽  
pp. 012008
Author(s):  
N Rajamurugu
Keyword(s):  
Renewable Energy ◽  
Fossil Fuels ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Experimental Studies ◽  
High Mass ◽  
Energy Sources ◽  
Solar Pv ◽  
Solar Chimney ◽  
Energy Agency

Abstract Renewable energy sources become suitable valid options to reduce the dependency on fossil fuels or petroleum products. The International Renewable Energy Agency reports that the world will harvest 40% of energy from renewable energy sources by 2030. Conventional technologies such as solar PV technology, consumes higher capital per unit (kWh) of electricity generation cost significantly higher than the traditional sources. Hence, solar chimney power generation system can be suitable option for generating low cost energy. Solar chimneys are developed and tested by different researchers in enhancing the performance of the system. Studies on the geometric modifications of the collector, and chimney are limited. The aim of this paper is to analyse the experimental data obtained from a divergent solar chimney. Experimentation is carried under sunlight in an open atmosphere. The airflow rates in the chimneys are tested under different collector outlet height. The experimental results showed that a chimney with higher collector openings was performed well than other models. The computational analysis is also carried out using ANSYS Fluent software package which shows that the collector opening of 2.5m is recommended for higher high mass flow rate and system efficiency.

Emission fluxes of heavy metals from the fluidized bed combustion of fossil fuels

1995 ◽  
Vol 26 ◽  
pp. S655-S656
Author(s):  
J Smolík ◽  
M Hartman ◽  
I Sýkorová ◽  
J Kučera
Keyword(s):  
Heavy Metals ◽  
Fluidized Bed ◽  
Fossil Fuels ◽  
Fluidized Bed Combustion ◽  
Emission Fluxes

scholarly journals Combustion Characteristics of Refuse-Derived Fuel by means of Circulating Fluidized Bed Test Furnace.

1993 ◽  
Vol 59 (565) ◽  
pp. 2666-2673
Author(s):  
Takaharu Toyoda ◽  
Yoshihisa Arakawa ◽  
Yukihisa Fujima ◽  
Takehiko Honda ◽  
Nobutika Koizumi ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Combustion Characteristics ◽  
Refuse Derived Fuel ◽  
Test Furnace

Investigation on the Combustion Properties of Refuse Derived Fuel in an Internally Circulating Fluidized Bed

2011 ◽  
Vol 354-355 ◽  
pp. 170-173
Author(s):  
Dian Fu Liu ◽  
Fang Qing Zhu ◽  
Xiao Lin Wei
Keyword(s):  
Fluidized Bed ◽  
Flue Gas ◽  
Circulating Fluidized Bed ◽  
Pollutant Emissions ◽  
Infrared Spectrometry ◽  
Environmental Standards ◽  
Refuse Derived Fuel ◽  
Combustion Properties ◽  
Refuse Derived Fuels ◽  
National Environmental

An internally circulating fluidized bed (ICFB) was applied to investigate the behavior of refuse derived fuels (RDF) incineration. The temperature distribution along bed height was measured by the thermocouple and the pollutant emissions in the flue gas were measured by Fourier transform infrared spectrometry Gasmet DX-3000. In the tests the concentrations of the species CO CO2 HCl N2O SO2 were measured online. The experimental results showed that the RDF could combust steadily in the fluidized bed. The concentrations of the CO HCl N2O in flue gas were higher than the values of national environmental standards.

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