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Suspension Burning
Published in Kenneth M. Bryden, Kenneth W. Ragland, Song-Charng Kong, Combustion Engineering, 2022
Kenneth M. Bryden, Kenneth W. Ragland, Song-Charng Kong
Large electric power plants with suspension burning boilers can co-fire biomass with coal, provided the biomass is ground or pulverized. Bales of switchgrass or other grasses are broken apart and pulverized or ground to fibers with a mass average length of 25 mm or less and with a fiber thickness of about 1 mm. Biomass is harvested relatively close to the power plant to minimize transportation costs if transported by truck, but if barge or rail transport is used, distance from the power plant is not as important. Co-firing pulverized agricultural residues or grasses can be done up to 10% on a heat replacement basis without changing burner design. Excess air is maintained at 2–3% oxygen in the flue gas. Wood can be co-fired by adding woodchips to the coal pulverizers at up to 5% replacement without degrading the coal pulverizers. The moisture content of the woodchips should not exceed 25%.
Environmental Impacts of Biofuel-Fired Small Boilers and Gasifiers
Published in Mateusz Szubel, Mariusz Filipowicz, Biomass in Small-Scale Energy Applications: Theory and Practice, 2019
Jozef Viglasky, Juraj Klukan, Nadezda Langova
In practice, woodchip characterized by moisture content can be divided into two bands: 15%–35% moisture content; and 40%–65% moisture content. A wide range of boilers, with low levels of ceramic lining and rated at up to 500 kW, is available to burn woodchips up to a maximum of 35% moisture content, while more thermally massive boilers are required to burn woodchips with a moisture content of 40% or above. Beyond 65%, moisture content combustion is very difficult to maintain.
Electricity generation
Published in Sven Ruin, Göran Sidén, Small-Scale Renewable Energy Systems, 2019
Woodchips are the simplest fuel for large-scale use of biomass. Woodchips are finely shredded wood treated in a wood-chipper. The raw material can be logging residues but also wood from forest clearing, pulpwood of bad quality or farmed willow. Even residues from the sawmill industry are used.
Hybrid input-output analysis to evaluate economic impacts of biomass energy
Published in International Journal of Green Energy, 2020
Cholapat Jongdeepaisal, Seigo Nasu
When a new technology is introduced to a community, it brings economic growth (Aslan 2016; Rosenburg 2004; Rúa and Lech 2016), but on the other hand, it certainly causes some economic impacts on the local economy. The biomass power plant consumes wood and woodchip to generate electricity. These resources are taken away from the existing economic sectors resulted in the loss in some economic sector consumption. On the contrary, these additional demands for resources of the biomass power plant encourage the competitive procurement for the resources so that these specific resource prices tend to increase higher than the existing market price. These impacts might as well be the benefit or drawback of the local economy.
Techno-economic evaluation of biomass drying in moving beds: The effect of drying kinetics on drying costs
Published in Drying Technology, 2019
Tiina Myllymaa, Henrik Holmberg, Pekka Ahtila
Woody biomass is mainly gained from forest harvesting, wood processing and short-rotation forest. Typical wood-based biomasses are, for example, woodchips, sawdust, and bark. Woodchips are formed in forest harvesting by chopping branches, roots, and the small top ends of logs. In the wood processing industry, biomass is generated from various unit processes (e.g. timber sawing and debarking). The properties of woody biomass, such as particle size and moisture content, vary significantly. For example, the typical moisture content of wood-based biomass (woodchips, wet/moist sawdust and bark) is in the range of 40–60% (wet basis).[1]
Energy savings in a rotary dryer due to a fuzzy multivariable control application
Published in Drying Technology, 2022
Modesto P. Júnior, Moisés T. da Silva, Frederico G. Guimarães, Thiago A. M. Euzébio
A schematic diagram of the rotary dryer process under study is shown in Figure 1. The fertilizer to be dried is fed in a rotating drum with a length of 24 meters and a diameter of 3.5 meters. The drum rotates at 3.93 RPM with an inclination of 6∘. The air is supplied by a fan and is heated by burning gases in a furnace. Wood chip biomass is used as fuel. The dried fertilizer is sent to the cooling and screening steps. A portion of this product, in the range of 2–4 mm, is sent to the stock warehouse, and the remaining portion is returned to the process for the granulation stage, which is the step prior to the drying process.