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Standards Development
This document specifies the methods for determination of thermal stability and thermal fragmentation of coal. It is applicable for the brown coal and lignites, anthracites and the bituminous with the caking index of zero (determined by ISO 15585).
1. Gasification is the cleanest of all commercial coal-based technologies and provides a feasible and economical route to produce hydrogen from abundant coal reserves. In the 21st century, coal gasification will be the heart of a new generation of energy plants possessing product flexibility, nearzero emissions, low production of solid wastes and waste water, high thermal efficiency and ability to capture CO2.
2. The worldwide gasification capacity has continued to grow for the past several decades and is at 70,817 megawatts thermal (MWth) of syngas output at 144 operating plants with a total of 412 gasifiers in 2010. The use of gasification in more than 27 industrialized countries, as well as the diversity of its products, illustrates the enormous potential for the continued growth of the gasification industry (cited from the website of ENERBY.GOV).
3. The choice of appropriate gasification technology depends on many diverse factorswhich include coal availability, type and cost, the syngas production rate and its enduse, and turndown requirements. Among them, the physical and chemicalproperties of the coal such as char reactivity, volatile matter, ash and moisturecontents, and swelling propensity, are the most important factors that influence the design and performance of a gasification plant, so a complete and detail characterization of coal is importantto make right decisions of the technical and economical.
4.The thermal stability or thermal fragmentation of coal is a property index to be considered when selecting raw materials for fixed bed gasification technologies, which is of great significance for rational utilization of coal resources, selection of appropriate gasification technology and optimization of production process.
5.This proposal will provide testing methods for coal on the determination of thermal stability and thermal fragmentation ,which would help the both parties of trade to evaluate if the coal character is suitable for a kind of fixed bed gasification technology and instruct to rational utilization of coal resources, selection of appropriate gasification technology and optimization of production process.
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