By R. B. Keey and P. V. Danckwerts (Auth.)

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Fuel, 1951. 2. BRYANT, W. H. , Ind. Eng. Chem. 25, 820 (1953). 3. , VEncyclopedic, ou Dictionnaire Raisonne des Sciences, des Arts et des Metiers, Le Breton, Paris (1751); facsimile edition, Friedrich Frommann Verlag, Bad Cannstadt. 4. GROSVENOR, W. , Trans. Am. Inst. Chem. Engrs. 1, 184 (1908). 5. HOUGEN, O. , WATSON, K. M. and RAGATZ, R. , 1, p. 123, Wiley, New York, 1954. 6. -Ing. Techn. 25, 575 (1953). 7. , Springer, Berlin/ Göttingen/Heidelberg, 1963. 8. LUIKOV, A. , Heat and Mass Transfer in Capillary-porous Bodies, Pergamon Press, Oxford, 1966.

Sei. 11, 183 (1959). 12. SPALDING, D. , Int. J. Heat Mass Transfer, 7, 3 (1964). 13. TOMLINSON, C. ), Cyclopaedia of Useful Arts and Manufacturers, Virtue, London and New York, 1854. 14. , Forsch. Gebiete Ing. 23 (1), 9 (1956). 15. , Drying by Means of Air and Steam, Scott, Greenwood & Son, London, 1901. CHAPTER 2 MOISTURE-SOLID RELATIONSHIPS THE way in which moisture is attached to its host material restrains the extent to which that material can be dried. Therefore a knowledge of the moisture-solid equilibria is an essential prerequisite in determining the ease of drying.

By mass balance, this air is given by gA = gG+gv+a-1. D. P. and P. 31) 14 Drying: Principles and Practice Values of a and gvare estimated from fuel analyses; the water vapour gvarises from both the moisture associated with the fuel and the hydrogen content of the latter. For very rough estimates Krischer(7) gives the following values for the mass change on combustion (gG— gA): + 0-5 kg/kg for solid fuels; no change for fuel-oils; —0-8 kg/kg for hydrogen-rich gases; and +0-8 kg/kg for hydrogen-lean gases.

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