PDF Publication Title:
Text from PDF Page: 072
Chapter 1 Biomass and technologies for its exploitation less wet (maximum accepted moisture content is generally about 20%). Nevertheless, on the other hand, low tar content makes possible to couple these gasifiers with ICEs or GTs (directly or after some treatments, that however are much less onerous than those which would be required in the updraft case), and this is a crucial point that makes these plants more suitable for power generation plants feeding. The size of the biomass pieces must be sufficiently large (at least 10 mm), because the bed is self-supported on the throat, and regular, in fact pieces having oblong or irregular shape may cause phenomena of bridging, i.e. the formation of an obstruction in the descent of the material resulting in temperature fluctuations, and channelling, i.e. the fall of non-pyrolysed biomass in the reduction zone, causing high production of tars and non reacted material (for these reasons, gasifiers are generally equipped with vibrating or mixing systems). Another disadvantage of this configuration is the limitation in the scaling-up of plants, that is due to the injection method of the oxidiser, that can not reach the centre of the biomass bed if the throat diameter is too wide. The open-core configuration has been developed to plug these gaps, essentially eliminating the throat. As visible in the figure, both biomass (that now can have a smaller size) and air/oxygen enter in the gasifier from the top and proceed together downwards. Therefore the oxidiser mixes uniformly with the solid material from the very beginning, thus solving the problems related to the difficult penetration of the jet from the nozzles (and thus to the plant scaling, at least partially). After the drying phase, right thanks to this early mixing, there is a zone in which pyrolysis and combustion occur together as a matter of fact (the phenomenon is called “flaming pyrolysis”), since the volatile products freed by the pyrolysis are immediately burnt by the oxidiser. However, a part from this point, the whole process is analogous to the throated case. Crossdraft gasifiers (Figure 1.16) are a middle way solution between the two previously described: biomass is still charged from the top, while the oxidiser is injected at high velocity through a nozzle from one side and syngas leaves the reactor by the other one. The reaction volume is very small, surrounded by layers of ash, charcoal and biomass: this is advantageous in terms of thermal dissipation and allows the use of inexpensive materials for the gasifier walls, that are subject to lower thermal stress. Their main quality is however the low inertia, yielding good response to load changes and quick starting, due to the small biomass quantity involved in the reactions: for this 44PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
PDF Search Title:
SMALL-SCALE BIOMASS POWER GENERATIONOriginal File Name Searched:
PhD_thesis_Samuel_Carrara.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |