Thermal and Kinetic Analyses of the Pyrolysis of a Northern Great Plains Lignite

<p>The pyrolysis of Indian Head lignitic coal in argon, carbon monoxide and hydrogen was studied to obtain a kinetic model of the process and to determine heat effects . A Du Pont 910 differential scanning calorimeter and a Du Pont 951 therm ogravim etric analyzer were utilized to measure heat effects and weight loss respectively.</p><p>N eith er the s in g le - r e a c t io n nor the d is tr ib u te d a c t iv a tio n energy p y r o ly s is models generated k in e tic parameters o f general valu e, although both models p red icted p y r o ly s is weight loss adequately. A procedure to determine the heat o f p y r o ly s is was d evised , re q u irin g the c o l l e c t i o n and ma n ip u la tio n o f c o a l, char, blank and c e l l c a lib r a t io n c a l o r i metry thermograms and a p y r o ly s is mass thermogram fo r each heat o f p y r o ly s is determ ination. The heat o f p y r o ly s is in an in e rt atmosphere was determined to be exothermic in the range o f 70 to 110 j/ g over a range o f 350 to 550 C. L ig n ite subjected to 400 psig atmospheres o f carbon monoxide and hydrogen e x h ib ite d thermograms with d is t in c t exothermic c h a r a c te r is tic s above 460 C, which were not observed under in e r t atmospheric co n d itio n s. P y r o ly t ic heat e f f e c t s had l i t t l e in flu en ce on the in te rn a l heat balance o f the U n iver s i t y o f North Dakota Energy Research Center's fixed-bed slagging gasifier.</p><p>No d e f i n i t i v e heat o f p y r o ly is valu e was determined under any con d ition . However, with experim ental refinem ents, c h a r a c t e r is tic heats o f p y r o ly s is o f d i f f e r e n t coals may be d e f i n i t i v e l y measured. A lso, i t is suggested that d i f f e r e n t i a l ca lo rim e try and mass thermograms, used in tandem, may be o f value in determ ining v o l a t i l e mass tr a n s fe r rates, which would be o f b e n e fit in c o a l p y r o ly is modeling.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Chemical Engineering

Year

1984

Author dc:creator

• Hefta, Ross Steven

Repository record dc:identifier

https://commons.und.edu/theses/1142

OAI identifier oai:identifier

oai:commons.und.edu:theses-2144