Analytical Methods for Coal and Coal Products. Volume II by Clarence Karr (Eds.)

By Clarence Karr (Eds.)

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H. Given and Richard F. Yarzab t e d , t h e n all s a m p l e s s h o u l d b e e i t h e r d r y or i n t h e e q u i l i b r i u m m o i s t u r e c o n d i t i o n , a n d a b e t t e r d m m f or m i n e r a l - c o n t a i n i n g b a s i s u s e d . T h e d a t a so far d i s c u s s e d are k n o w n as " g r o s s calorific v a l u e s , " a n d refer to t h e c o m b u s t i o n p r o c e s s c a r r i e d o u t at c o n s t a n t v o l u m e , w i t h p r o d u c t s at 2 5 - 4 0 ° C a n d w a t e r i n the l i q u i d s t a t e .

T h e w a y i n w h i c h t h e s e d a t a are u s e d w a s set o u t i n S e c t i o n III as a m e a n s o f d e f i n i n g a d m m f e l e m e n t a l (or u l t i m a t e ) a n a l y s i s , a n d n e e d n o t b e repeated here. S o m e of the steps, however, require comment. E q u a t i o n (2) is e x a c t as a c o r r e c t i o n for t h e c o n t r i b u t i p n o f c a r b o n a t e C 0 2 to o r g a n i c c a r b o n , a n d t h e p r e c i s i o n is d e p e n d e n t s o l e l y o n t h e p r e c i s i o n o f t h e e x p e r i m e n t a l m e a s u r e m e n t s .

H. Given and Richard F. Yarzab The equation w a s originally derived b y Leighton and Tomlinson (1960) i n a s o m e w h a t m o r e e l a b o r a t e f o r m H 0 = H t ot - 0 . 0 1 4 A s h + 0 . 0 1 8 S P + 0 . 0 1 9 C O 2 + 0 . 0 1 4 S O 3 (3a) T h e last t e r m r e p r e s e n t s sulfate i n a s h , c a l c u l a t e d as S 0 3 p e r 1 0 0 p a r t s b y w e i g h t of dry coal. For B r i t i s h c o a l s t h i s rarely e x c e e d s 0 . 5 % , a n d so t h e B r i t i s h s t a n d a r d o m i t s t h e w h o l e t e r m as h a v i n g a n e g l i g i b l e effect o n t h e c o r r e c t i o n .

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