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

By Clarence Karr (Eds.)

ISBN-10: 0123999022

ISBN-13: 9780123999023

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H o w e v e r , for t h i s r e a s o n i n g to b e s o u n d , t h e s a m p l e s h o u l d b e i n s o m e s t a n d a r d c o n d i t i o n o f m o i s t n e s s . A t the s a m e t i m e , t h i s m a y n o t m a t t e r u n l e s s a s a m p l e is at the l o w e r e n d o f a r a n k class. O n t h e o t h e r h a n d , i f t h e calorific v a l u e is to b e u s e d i n r e s e a r c h d i r e c t l y as a n u m e r i c a l p a r a m e t e r , for e x a m p l e as a m e a s u r e o f t h e d e g r e e o f m e t a m o r p h i s m a g a i n s t w h i c h a n o t h e r p r o p e r t y is to b e plott F o r d e t a i l s o n m e t h o d s for d e t e r m i n a t i o n o f calorific v a l u e s e e V o l u m e I, C h a p t e r 6 , S e c t i o n V.

C o n s e q u e n t l y a s h y i e l d s w e r e v e r y l o w ( u s u a l l y 1 - 2 % ) , a n d total sulfur w a s also l o w ( 0 . 6 - 1 % ) , so t h a t m o s t o f it w o u l d h a v e b e e n o r g a n i c . In t h e s e c i r c u m s t a n c e s falsification o f o x y g e n - b y - d i f f e r e n c e w o u l d h a v e b e e n s m a l l , t h o u g h p r o b a b l y not n e g l i g i b l e . O b v i o u s l y , if o n e w i s h e s to e x p r e s s t h e c o n t e n t o f a f u n c t i o n a l g r o u p as a fraction o f total o x y g e n , a d m m f v a l u e for the latter s h o u l d b e u s e d .

S . c o a l s ; M i l l e r a n d G i v e n , 1 9 7 2 ) . T h e n a c o m b i n a t i o n o f t h i s a s s u m p t i o n w i t h E q s . (2) a n d (9) affords C0 = Ct ot ~ ( 0 . 0 1 4 A s h + 0 . 0 0 5 5 S P) (11) S i m i l a r l y , E q . (3) is s i m p l i f i e d to H 0 = H t ot - ( 0 . 0 1 3 A s h - 0 . 0 2 S P) (12) These equations require fewer analytical data than those presented earlier. A r e t h e y v a l i d ? The consistency of d m m f elemental analyses of coals, whether o b t a i n e d w i t h t h e u t m o s t r i g o r or w i t h t h e a i d o f a p p r o x i m a t i o n s , c a n b e v e r y usefully t e s t e d b y m e a n s o f a s e m i e m p i r i c a l f o r m u l a p r o p o s e d b y Mott and S p o o n e r (1938).

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