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By Clarence Karr (Eds.)

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Extra info for Analytical Methods for Coal and Coal Products. Volume II

Example text

0 9 8 i f t h e t e r m i n S 0 3 is o m i t t e d ) . T h e h y d r o g e n c o n t e n t o f c o a l s is a r o u n d 5 % , so that t h e c o r r e c t i o n s j u s t c a l c u l a t e d a r e n e a r l y 2 % o f t h e v a l u e , a n d are l a r g e r t h a n t h e p r e c i sion of the experimental determinations. W i t h m a n y coals, the corrections will b e less than those calculated, and the whole matter m a y app e a r trivial. N e v e r t h e l e s s , t h i s c o r r e c t i o n h a s a c o n s i d e r a b l e i n f l u e n c e o n t h e o u t c o m e o f t h e M o t t - S p o o n e r t e s t (see later).

H o w e v e r , the m o d i f i e d f o r m u l a lent itself r e a d i l y to s o m e further a p p r o x i m a t i o n s , w h i c h h a v e p r o v e d significant. S u p p o s e t h a t d i r e c t d e t e r m i n a t i o n of t h e C 0 2 y i e l d is n o t a v a i l a b l e . Let us assume that carbonate minerals in coals have a m e a n molecular w e i g h t e q u a l to t h a t o f c a l c i u m c a r b o n a t e a n d t h a t t h e y r e p r e s e n t 1 0 % o f total m i n e r a l m a t t e r (as i n d i c a t e d b y a s t u d y o f 6 0 U .

2 H + 4 0 . 5 S o - ( 6 5 . 8 8 - 0 . 3 1 O d i f)fO d i ff ( 1 3 b ) For a large n u m b e r o f a n a l y s e s , t h e m e a n difference, c a l c u l a t e d minus t h e o b s e r v e d C V , is z e r o ( M o t t a n d S p o o n e r , 1 9 3 8 ; N e a v e l , 1 9 7 4 ; G i v e n a n d Y a r z a b , 1 9 7 5 ) . It s h o u l d b e n o t e d t h a t a c o m p a r i s o n o f o b s e r v e d a n d c a l c u l a t e d calorific v a l u e s i n v o l v e s a m a j o r p o r t i o n o f t h e b a s i c coal a n a l y s e s : C , H , N , f o r m s of sulfur, m o i s t u r e , m i n e r a l m a t t e r c o n t e n t , a n d calorific v a l u e (the v a l u e for N affects O b y difference, a n d S p affects S 0 b y difference).

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