Advances in Fine Particles Processing

Advances in Fine Particles Processing
Author: John Hanna
Publisher: Springer Science & Business Media
Total Pages: 449
Release: 2012-12-06
Genre: Science
ISBN: 1468479598

Processing of fine particles has presented numerous challenges to scientists and engineers for many years. Considerable progress has al ready been made in meeting these challenges across various fields of applications around the world. Research on every aspect of fine particle processing has gained momentum in recent years, resulting in the development of new processes, improved products, and better understanding of the science and engineering fundamentals of fine particles. This symposium addressed the recent progress in fine particles processing, particularly in the production of minerals for chemicals, pigments and metal production, ceramic materials, and fossil fuels. This book represents the edited proceedings of the International Symposium on Advances in Fine Particles Processing, where selected peer-reviewed papers describe current practices, review the state of the art and report original fundamental and applied research on fine particle production, sizing, characterization of the interface, fluid flow, and interparticle colloidal interactions, leading to dispersion, flocculation and flotation. Processing of fine particles by multi-chemical, physical and biological phenomena has also been addressed. Accordingly, the book consists of seven parts, with each part addressing a specific topic. Part One deals with production of fine particles by comminu tion methods where different milling practices, mathematic modeling and physical chemical control methods are reported. Part Two covers particle flow properties in various fluids. Part Three addresses surface and colloidal phenomena in fine particle processing, while Part Four continues this topic but with emphasis on clay minerals.

Low-Rank Coal Grinding Performance Versus Power Plant Performance

Low-Rank Coal Grinding Performance Versus Power Plant Performance
Author:
Publisher:
Total Pages:
Release: 2008
Genre:
ISBN:

The intent of this project was to demonstrate that Alaskan low-rank coal, which is high in volatile content, need not be ground as fine as bituminous coal (typically low in volatile content) for optimum combustion in power plants. The grind or particle size distribution (PSD), which is quantified by percentage of pulverized coal passing 74 microns (200 mesh), affects the pulverizer throughput in power plants. The finer the grind, the lower the throughput. For a power plant to maintain combustion levels, throughput needs to be high. The problem of particle size is compounded for Alaskan coal since it has a low Hardgrove grindability index (HGI); that is, it is difficult to grind. If the thesis of this project is demonstrated, then Alaskan coal need not be ground to the industry standard, thereby alleviating somewhat the low HGI issue (and, hopefully, furthering the salability of Alaskan coal). This project studied the relationship between PSD and power plant efficiency, emissions, and mill power consumption for low-rank high-volatile-content Alaskan coal. The emissions studied were CO, CO2, NO(subscript x), SO2, and Hg (only two tests). The tested PSD range was 42 to 81 percent passing 76 microns. Within the tested range, there was very little correlation between PSD and power plant efficiency, CO, NO(subscript x), and SO2. Hg emissions were very low and, therefore, did not allow comparison between grind sizes. Mill power consumption was lower for coarser grinds.