Abstract
In the present investigation, we used semidried banana leaves to produce biogas through anaerobic digestion where the methane content in biogas reached up to 87% via a scrubber fabricated with packed bed iron chips for removal of carbon dioxide and hydrogen sulphide. The diesel engine was converted to run in dual-fuel mode under variation of biogas flow rate at different engine loads. Yttria stabilized zirconia was used as thermal barrier coating (TBC) on piston crown and valves to improve the performance of dual-fuel engine. It was observed that engine with TBC has shown an improved combustion and performance characteristics for dual-fuel operation with reduction in exhaust emissions. The brake thermal efficiency at full load operation is decreased by 23, 29 and 34% for uncoated engine with induction of biogas at 0.6, 0.8 and 1 kg h− 1, respectively, while this decrease is minimized to 10, 12 and 19% for coated engine at the corresponding flow rates with respect to base result. In uncoated engine the carbon monoxide emission at highest engine load is increased by 35, 35 and 40% of the respective biogas flow rates, while in coated engine, the percentage of increase is reduced to 25, 28 and 33% as compared to diesel mode operation. Similar trends were observed for unburnt hydrocarbon emissions, while nitric oxide emissions increased for coated engine in both modes of operation.
Highlights
Developing countries in the world including India are currently facing three important problems; increasing energy demand, increased environmental pollution and waste disposal
In the present scenario most of the compression ignition (CI) engine runs with fossil fuel which is depleting at a faster rate, leading to researchers for development and dissemination of renewable energy resources to incorporate as a substitute for fossil fuel [4]
Engine with thermal barrier coating (TBC) showed a reduction in brake specific energy consumption (BSEC) in comparison with uncoated engine, because of increased combustion temperature leading to enhanced energy conversion rate, ensuring the diminution in the energy consumption as compared to uncoated dual-fuel engine [13]
Summary
Developing countries in the world including India are currently facing three important problems; increasing energy demand, increased environmental pollution and waste disposal. In the present scenario most of the CI engine runs with fossil fuel which is depleting at a faster rate, leading to researchers for development and dissemination of renewable energy resources to incorporate as a substitute for fossil fuel [4]. Duc and Wattanavichien [5] conducted an experiment to understand the consequence of biogas induction on the performance and emission parameters of CI engine They found higher carbon monoxide (CO), unburnt hydrocarbon (HC) emissions with increased specific energy consumption in dual-fuel mode. BTE increased with increase in compression ratio or 20.0, 18.3, 17.1 and 16.4% at compression ratios of 18, Jena and Acharya Sustainable Environment Research (2019) 29:24
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