Energy requirements in both urban and rural areas are increasing giving added stress to the power generators and energy sources, thus blackouts are becoming common scenarios. Renewable energy from tree biomass is bein...Energy requirements in both urban and rural areas are increasing giving added stress to the power generators and energy sources, thus blackouts are becoming common scenarios. Renewable energy from tree biomass is being eyed to provide solution to insufficient energy supply. A component of the green energy generation project is to assess the biomass potential of major industrial tree plantation species in the region at various ages, to determine the sustainability of a biomass-based green energy generation. Actual field measurements of biomass in selected plantations were conducted. In the field inventory, a plot measuring 10 × 50 meters was laid out randomly on the sampling site. For all trees inside the plot, the basal diameter and diameter at breast height for ages 1 to 2 years old and 3 to 5 years old, respectively were recorded. The results revealed that the biomass of major industrial tree species in Year 1 followed the order: Mangium (Acacia mangium) > Ipil-ipil (Leucaena leucocephala) > Falcata (Paraserianthes falcataria) > Bagras (Eucalyptus deglupta). However, as the trees mature, the biomass generation changed with Falcata overtaking Mangium. The order then was: Falcata (Paraserianthes falcataria) > Mangium (Acacia mangium) > Ipil-ipil (Leucaena leucocephala) > Bagras (Eucalyptus deglupta). Of the major industrial tree species, Falcata (Paraserianthes falcataria) and Mangium (Acacia mangium) are noted to have the biggest potential in supplying the biomass requirement of the green energy plant.展开更多
The paper presents a reliability evaluation method based on fault tree analysis with set theory and minimal cut set as core algorithm, which can be used to evaluate the reliability for industrial grids with wide appli...The paper presents a reliability evaluation method based on fault tree analysis with set theory and minimal cut set as core algorithm, which can be used to evaluate the reliability for industrial grids with wide application of variable frequency drives. The working principle is introduced firstly, based on which the method development considering different system topology designs, backup solutions and redundancy mechanisms are analyzed in details. In the end the proposed method is applied to two cases to show the reliability performance of system with variable frequency drives. The proposed method is also suitable for analyzing the reliability performance of industrial grids with other types of power electronic converter technology.展开更多
In this work, we have focused on the risks emanating </span><span style="white-space:normal;font-family:"">from</span><span style="white-space:normal;font-family:"&qu...In this work, we have focused on the risks emanating </span><span style="white-space:normal;font-family:"">from</span><span style="white-space:normal;font-family:""> the steam production process in a thermal production department with a view to reducing the occurrence of unwanted events. The practical aspect of this study is to ensure the well-being of production actors and the surrounding population.</span><span style="white-space:normal;font-family:""> </span><span style="white-space:normal;font-family:"">Subsequently, we opted for fault tree analysis and HAZOP, which are tools for studying the probabilities of occurrence of unwanted events in the operation of industrial thermal installations.</span><span style="white-space:normal;font-family:""> </span><span style="white-space:normal;font-family:"">In addition, in the process of steam production, it emerges that pressure and temperature remain the most important parameters to monitor in order to reduce the risks associated with chemicals but especially with steam circuits.展开更多
文摘Energy requirements in both urban and rural areas are increasing giving added stress to the power generators and energy sources, thus blackouts are becoming common scenarios. Renewable energy from tree biomass is being eyed to provide solution to insufficient energy supply. A component of the green energy generation project is to assess the biomass potential of major industrial tree plantation species in the region at various ages, to determine the sustainability of a biomass-based green energy generation. Actual field measurements of biomass in selected plantations were conducted. In the field inventory, a plot measuring 10 × 50 meters was laid out randomly on the sampling site. For all trees inside the plot, the basal diameter and diameter at breast height for ages 1 to 2 years old and 3 to 5 years old, respectively were recorded. The results revealed that the biomass of major industrial tree species in Year 1 followed the order: Mangium (Acacia mangium) > Ipil-ipil (Leucaena leucocephala) > Falcata (Paraserianthes falcataria) > Bagras (Eucalyptus deglupta). However, as the trees mature, the biomass generation changed with Falcata overtaking Mangium. The order then was: Falcata (Paraserianthes falcataria) > Mangium (Acacia mangium) > Ipil-ipil (Leucaena leucocephala) > Bagras (Eucalyptus deglupta). Of the major industrial tree species, Falcata (Paraserianthes falcataria) and Mangium (Acacia mangium) are noted to have the biggest potential in supplying the biomass requirement of the green energy plant.
文摘The paper presents a reliability evaluation method based on fault tree analysis with set theory and minimal cut set as core algorithm, which can be used to evaluate the reliability for industrial grids with wide application of variable frequency drives. The working principle is introduced firstly, based on which the method development considering different system topology designs, backup solutions and redundancy mechanisms are analyzed in details. In the end the proposed method is applied to two cases to show the reliability performance of system with variable frequency drives. The proposed method is also suitable for analyzing the reliability performance of industrial grids with other types of power electronic converter technology.
文摘In this work, we have focused on the risks emanating </span><span style="white-space:normal;font-family:"">from</span><span style="white-space:normal;font-family:""> the steam production process in a thermal production department with a view to reducing the occurrence of unwanted events. The practical aspect of this study is to ensure the well-being of production actors and the surrounding population.</span><span style="white-space:normal;font-family:""> </span><span style="white-space:normal;font-family:"">Subsequently, we opted for fault tree analysis and HAZOP, which are tools for studying the probabilities of occurrence of unwanted events in the operation of industrial thermal installations.</span><span style="white-space:normal;font-family:""> </span><span style="white-space:normal;font-family:"">In addition, in the process of steam production, it emerges that pressure and temperature remain the most important parameters to monitor in order to reduce the risks associated with chemicals but especially with steam circuits.