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Multi-criteria evaluation of slurry fuels based on coal and organic waste

Abstract

The applicability of slurry fuels for power generation by direct combustion was assessed using multi-criteria decision making (MCDM). Slurry fuels based on coal slime and water with 5 % additive of biomass waste (rice husk, sawdust and sewage sludge) were studied. was experimentally established that the use of biomass waste in the composition of slurry fuel improves the characteristics of sedimentation stability by 2.5-4.2 times, atomization parameters by 1.5-2.0 times and environmental indicators of the combustion process by 1.5-2.4 times. A multi-criteria assessment of the efficiency of using slurry fuels in comparison with widely used solid fossil fuels in thermal power engineering was carried out based on the obtained experimental results. The indicators of the highest relative efficiency for slurry fuels with additives of sewage sludge and rice husk in the temperature range of 700-900 degrees C are 10-12 % higher than for the composition without additives.

article Article

date_range 2024

language English

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Belonogov Maxim

Dorokhov Vadim

Glushkov Dmitrii

Kuznechenkova Daria

Paushkina Kristina

Romanov Daniil

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Fuel slurry

Droplet

High temperature air

Combustion

Emission

MCDM

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Abstract

An experimental study was performed to investigate the effects of polypropylene fibers on uncorroded and corroded reinforced concrete beams. Three different volume fractions of polypropylene fibers having 0, 0.5, and 1.5%, were tested at four corrosion levels of 0% and approximately 5, 7, and 9%. A full scale of an accelerated corrosion pool was used for the accelerated corrosion process. Reinforced concrete beams were used for an under monotonic bending test. The contribution of the actual corrosion levels of transverse and longitudinal reinforcement bars to the total corrosion levels were obtained from reinforcement bars fully extracted from concrete. Flexural strength, bond-slip, and moment-curvature relationships were examined for uncorroded and corroded reinforced concrete beams. A new model was developed to predict the flexural strength of corroded reinforced concrete beams. The proposed model for predicting the residual flexural strength of corroded beams was compared with test data published in previous studies. Furthermore, a novel model is presented for improved predictions between the actual and theoretically estimated corrosion mass losses, based on Faraday’s law, with the aid of fully extracted reinforcement bars. The model used to predict the flexural strength of corroded reinforced concrete beams with large sizes demonstrated good agreement with current and previously published literature data. In the case of corroded beams comprising differing amounts of polypropylene fibers, the performance of the corroded beams was limited by a fiber volume fraction of 1.5% at low corrosion levels.

article Article

date_range 2018

language English

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