Mixed-rank coal
Mixed-rank coal describes coal seams or coal blends that do not fit neatly into a single coal rank category. These deposits or mixes can contain material ranging from lignite and…
Premium blended anthracite
Premium blended anthracite is a carefully formulated form of high-rank coal designed to meet strict performance and quality specifications. By blending anthracite from different seams and processing streams, producers create…
Ultra-low-nitrogen coal
This article explores the characteristics, occurrence, mining, economic significance and industrial applications of ultra-low-nitrogen coal. It describes where such coals are typically found, why they matter for air quality and…
Low-nitrogen coal
Low-nitrogen coal is a class of thermal coals whose nitrogen content is notably lower than typical coals used in power generation and industrial processes. The presence of less fuel-bound nitrogen…
Advanced supercritical coal fuel
This article examines the role, distribution, economics and industrial importance of coal used for advanced supercritical and ultra‑supercritical power plants — commonly referred to here as advanced supercritical coal fuel.…
Oxyfuel-grade coal
This article examines the properties, occurrence, extraction, economic role and industrial importance of oxyfuel-grade coal — coal types most suitable for combustion in an oxyfuel environment aimed at facilitating post-combustion…
Coal for circulating fluidized bed
Circulating fluidized bed (CFB) boilers have become an important technology for burning a wide variety of fuels, especially lower-quality coals that are abundant but challenging for conventional combustion systems. This…
CFB-grade coal
This article examines CFB-grade coal—a category of solid fuel optimized for use in circulating fluidized bed combustion systems—and explores where it occurs, how and where it is mined, its economic…
FBC-grade coal
This article examines FBC-grade coal in depth: what it is, its characteristic properties, where it is found and mined, how it is used in industry, and the economic and environmental…
Coal for fluidized-bed combustion
This article examines coal used specifically for fluidized-bed combustion (FBC) — a versatile coal-combustion technology well suited to a wide range of fuels, especially low-grade coals. We will describe the…
