Predictions of NOx/N2O emissions from an ultra-supercritical CFB boiler using a 2-D comprehensive CFD combustion model
Publication date: Available online 26 June 2019Source: ParticuologyAuthor(s): Jieqiang Ji, Leming Cheng, Yangjun Wei, Junfeng Wang, Xinyu Gao, Mengxiang Fang, Qinhui WangAbstractNOx and N2O emissions from an ultra-supercritical circulating fluidized bed (CFB) boiler were predicted using a two dimensional (2-D) comprehensive computational fluid dynamics (CFD) combustion model. This model was developed from a three dimensional model for a supercritical CFB boiler previously constructed by our group. Based on an analysis of the NOx and N2O conversion processes in a CFB boiler, the primary formation and destruction reactions w...
Source: Particuology - June 27, 2019 Category: Science Source Type: research
Construction of hierarchical functional nanomaterials for energy conversion and storage
We describe several typical reaction processes, such as the gas-phase flame-combustion method, the vapor-phase deposition technique, and the solid–liquid interface reaction process, to investigate the properties of fluid flow, mixing, transport, and chemical reaction. We also study the formation mechanism, structural evolution and control methods for hierarchical nanomaterials by using combined experimental and simulation methods. These well-designed and prepared hierarchical functional materials can be used in energy storage and conversion fields. Valuable information is provided for the structural design and performanc...
Source: Particuology - June 27, 2019 Category: Science Source Type: research
A numerical assessment of two geometries for reducing elbow erosion
Publication date: Available online 24 June 2019Source: ParticuologyAuthor(s): Carlos Antonio Ribeiro Duarte, Francisco José de Souza, Diego Nei Venturi, Martin SommerfeldAbstractElbows in pneumatic conveying systems are normally prone to the erosive effects of conveyed particles. There are a number of solutions available to reduce such damage. A widely used geometric alternative for replacing the 90° elbow and reducing erosive wear is the plugged tee. Another option, although less commonly used, is the vortex-chamber elbow. In both cases, the effective reduction in erosion brought about is unclear, as it strongly depends...
Source: Particuology - June 25, 2019 Category: Science Source Type: research
Potential emission reductions by converting agricultural residue biomass to synthetic fuels for vehicles and domestic cooking in China
Publication date: Available online 25 June 2019Source: ParticuologyAuthor(s): Xiaoliang Wang, S. Kent Hoekman, Yang Han, Judith C. Chow, John G. Watson, Xiaomeng Wu, Ye Wu, Dennis Schuetzle, Robert SchuetzleAbstractVehicle exhaust and transported biomass burning emissions are important air pollution sources in many urban areas, and domestic cooking with biomass fuels causes indoor air pollution in many rural areas. Using agricultural waste-generated synthetic fuels can reduce emissions both from vehicles and biomass burning. To estimate the potential benefits of synthetic diesel in Beijing, the emission factor model for th...
Source: Particuology - June 25, 2019 Category: Science Source Type: research
Estimation of solids circulation rate and char transfer rate from gasifier to combustor in a dual fluidized-bed pilot plant for biomass steam gasification
Publication date: Available online 22 June 2019Source: ParticuologyAuthor(s): M. Hafizur Rahman, Lius Daniel, Ujash Shah, Xiaotao Bi, John R. Grace, C. Jim LimAbstractOperation of a dual fluidized bed, consisting of a riser as combustor and bubbling bed as gasifier, for synthesis gas production from a solid fuel requires determination of the solids circulation rate and char transfer rate. The performance relies on supplying sufficient heat from the combustor to the gasifier by circulation of solids between these two reactors. The flow rate of char is required to track the heat generated in the combustor, which supports end...
Source: Particuology - June 24, 2019 Category: Science Source Type: research
