COAL CONVERSION PROCESSES AND THEIR MATERIALS REQUIREMENTS
The future trend in energy demand is expected to lead to greater emphasis on coal as a source. After reviewing the various coal conversion processes and representative modern techniques, the state of industrial development is described. The materials used in construction range from carbon steel to superalloys and include refractories and engineering ceramics; the selection depends on the operating conditions of each particular application together with the balance of properties required. Considering modern high efficiency processes some of the major problems concern the materials for high temperature components. When these materials are exposed to the aggressive, low oxygen coal conversion environment, they have to be corrosion resistant in the presence of erosive particles. Furthermore, where they form part of the pressure containing circuit, specific levels of mechanical properties are demanded. Relatively few data are available, up to the present, on the corrosion behaviour, or on the long time high temperature mechanical behaviour of materials exposed in the types of atmospheres relevant to modern coal conversion systems. However, from pilot plant experience it appears that mixed sulphidation - oxidation is the major degradation process and coatings may be necessary to overcome the conflicting demands for corrosion resistance and mechanical strength at high temperatures. Pointers are given for the direction of future developments, both for metallic and engineering ceramic classes of materials, to meet this growing technological challenge.
Bibliographic Reference: EUR 9182 EN (1984) FS, 113 P., BFR 400, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989122060200 / Last updated on: 1987-01-01
Available languages: en