Combustion performance of syngas from palm kernel shell in a gas burner

Insufficient and various environmental issues of fossil fuels as the current world dominated energy is now becoming a serious global issue. The rapidly increasing demand for alternative energy sources has contributed to the steady growth of renewable energy. Owing to the fact of the abundant presence of palm kernel shell (PKS) as one of palm biomass wastes in South East Asia region, this paper investigates syngas produced from gasified PKS. The investigation is regarding its composition and combustion performance in a gas burner system. It covers emissions analysis, temperature profile and flame length. The produced syngas from downdraft gasifier was burned in the combustion chamber in air-rich and fuel-rich combustion conditions. From the experiment, the results showed that the oxidation zone temperature of above 750°C for the downdraft gasifier is suitable for producing syngas. Produced syngas can be classified as pure-carbon monoxide (CO) syngas due to 94.9% CO content with no hydrogen (H2) content and low heating value (LHV) of 10.7 MJ/kg. The wall temperature profiles for burnt syngas produced via downdraft gasification was higher with longer pattern at fuel-rich condition, which signified higher energy of syngas produced from downdraft gasifier compared to fluidised bed gasifier. The associated flame length was also longer at fuel-rich condition. Produced emission of 56 ppm NOX, 37 ppm CO and 1 ppm SO2 can still be considered as acceptable to human. It can be concluded that syngas produced from PKS shown a high potential to serve as an alternative source of energy due to its high energy content

Strategy to Enhance the Low-Voltage Ride-Through in Photovoltaic System During Multi-Mode Transition

With the increasing capacity of distributed generation (DG) connected to the power grid, the future generation of photovoltaic (PV) systems are expected to provide a full range of voltage regulation during grid faults in order to enhance the low-voltage ride-through (LVRT) capability of a PV system. In such a condition, the DG should remain connected to the grid for reactive power support, thereby improving voltage profile. This paper aims to propose a control strategy of active and reactive power for a single-stage three-phase grid-connected PV system to enhance the LVRT. The dynamic behaviours of the system were investigated by considering various scenarios such as varying irradiance, local load disconnection, and short circuits, at different locations during the multi-DG operation. Results confirm that the grid-connected PV system is able to remain connected to the power grid during steady-state and transient-state conditions without violating the grid code requirements. The established dynamic behaviour analysis model of the proposed control for grid-connected PV systems can be used in planning an operational strategy for a practical system

Green IT in Digitized Society : How Green Is your Citizen?

A day without IT is like a day without sunshine, because IT plays a crucial role in human life and industry in the whole world especially towards industrial revolution 4.0. However, the evolution of IT became one of the contributors to the Carbon Dioxide (CO2) emission that cause global warming. Therefore, Green IT had being introduced; however, most of previous researches were focus more on the implementation of Green IT in an organization rather than IT user context. The objective of this paper is to identify the criteria to assess Green IT practice among IT user. Systematic literature approach which consists of seven phases had being used to identify the criteria. As the finding, three main criteria had being identified: IT sourcing, IT operation and IT disposal. Each of these main criteria had sub-criteria which can be used to identify how green is an IT user

Utilizing of biodiesel fuel for micro gas turbine combustion performance

Malaysia produces 0.5 tons of palm biodiesel per month, which has great potential to be transformed into valuable fuels for electricity generation by using a micro gas turbine (MGT). The MGT is an alternative power generation unit that is capable to generate the electricity in the range of 10 to above 50 Kilowatt. This unit comprises of automobile turbocharger with a combustion chamber connected in axial between its compressor and turbine. The MGT is able to achieve a maximum approximate temperature value, to 520 517.4°C by using diesel fuel. Next by using B20 Palm Methyl Ester (PME) a maximum approximate temperature is 500499.8°C, B15 Coconut Methyl Ester (CME) at 485.6°C and B30 Jatropha Methyl Ester (JME) at 439.7°C. The reduction percentage of biodiesel temperature at a maximum level compared to diesel was 11.4% for B30 JME, 6.1 % for B15 CME and 3.4 % for B20 PME. Significant aspect here, the knowledge about this reduction rate is established that can be help be help as a new technology in a future

Performance and emission characteristics of rice bran oil in an oil burner

The fossil fuels have been the most practical way to produce energy for industries, vehicles and homes due to their lower prices, good combustion properties and their availability compared to other types of fuels. However, in this era of modernization, one of the biggest challenges of humanity is depletion of fossil fuels may result the increasing of the price. Studies have found out that it is possible to improve physical and chemical characteristics of alternative fuel based biodiesel by using the transesterification process and hence act as an alternative to mineral diesel. Therefore, the study about the potentiality of the rice bran oil as biodiesel feedstock is explained in this paper. The aim of this study is determining the performance and emission characteristics of the rice bran oil biodiesel (RBOBD). In addition, the comparison is made for its combustion and emission characteristics to those of conventional diesel fuel (CDF). Results show that RBOBD is very good at minimizing emissions, especially CO and SO2 with the value 60 ppm and 10 ppm, respectively. The establish information may help Malaysia to recognize the potentiality of the rice bran oil in order to replace the conventional fuel in the future

Combustion and emission characteristics of palm-oil-based biodiesel in a liquid fuel burner

This paper presents an experimental investigation of the combustion characteristics of palm oil methyl ester (POME) or called as biodiesel (B), in an open-ended combustion chamber or called as open-ended liquid fuel burner. The performance of conventional diesel fuel (CDF) and various percentages of POME and CDF, which are B10 (10% biodiesel) and B30 (30% biodiesel) were studied to evaluate their performance. Combustion temperature profile in the combustion chamber and exhaust emission concentrations such as NOx, CO and SO2 have been carried out using five different equivalent ratios such as Φ = 0.6, 0.8, 1.0, 1.2 and 1.4. The results show that as the biodiesel content increased, the emission significantly increased except for the NOx emission. It was also found that higher biodiesel content resulting faster combustion rate at near burner region, especially for Φ = 1.0 due to higher Cetane Number (CN) although the lower overall temperature profile produced compared to CDF alone. This proved the suitability of biodiesel for an enhanced transportation engine performance in the near future

Public Awareness and Practices Towards Self-Medication with Antibiotics Among Malaysian Population: Questionnaire Development and Pilot Testing

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SARS-CoV-2 vaccination modelling for safe surgery to save lives: data from an international prospective cohort study

Background: Preoperative SARS-CoV-2 vaccination could support safer elective surgery. Vaccine numbers are limited so this study aimed to inform their prioritization by modelling. Methods: The primary outcome was the number needed to vaccinate (NNV) to prevent one COVID-19-related death in 1 year. NNVs were based on postoperative SARS-CoV-2 rates and mortality in an international cohort study (surgical patients), and community SARS-CoV-2 incidence and case fatality data (general population). NNV estimates were stratified by age (18-49, 50-69, 70 or more years) and type of surgery. Best- and worst-case scenarios were used to describe uncertainty. Results: NNVs were more favourable in surgical patients than the general population. The most favourable NNVs were in patients aged 70 years or more needing cancer surgery (351; best case 196, worst case 816) or non-cancer surgery (733; best case 407, worst case 1664). Both exceeded the NNV in the general population (1840; best case 1196, worst case 3066). NNVs for surgical patients remained favourable at a range of SARS-CoV-2 incidence rates in sensitivity analysis modelling. Globally, prioritizing preoperative vaccination of patients needing elective surgery ahead of the general population could prevent an additional 58 687 (best case 115 007, worst case 20 177) COVID-19-related deaths in 1 year. Conclusion: As global roll out of SARS-CoV-2 vaccination proceeds, patients needing elective surgery should be prioritized ahead of the general population