ADVANCED HETEROGENEOUS REBURN FUEL FROM COAL AND HOG MANURE

Jensen, Melanie D. ; Timpe, Ronald C. ; Laumb, Jason D.

University of North Dakota

关键词: Plugging;    Mixtures;    Hydroxides;    01 Coal, Lignite, And Peat;    Processing;   

DOI  :  10.2172/822908
RP-ID  :  NONE
RP-ID  :  FG26-02NT41551
RP-ID  :  822908

美国|英语

来源: UNT Digital Library

【 摘 要 】

This study was performed to investigate whether the nitrogen content inherent in hog manure and alkali used as a catalyst during processing could be combined with coal to produce a reburn fuel that would result in advanced reburning NO{sub x} control without the addition of either alkali or ammonia/urea. Fresh hog manure was processed in a cold-charge, 1-gal, batch autoclave system at 275 C under a reducing atmosphere in the presence of an alkali catalyst. Instead of the expected organic liquid, the resulting product was a waxy solid material. The waxy nature of the material made size reduction and feeding difficult as the material agglomerated and tended to melt, plugging the feeder. The material was eventually broken up and sized manually and a water-cooled feeder was designed and fabricated. Two reburn tests were performed in a pilot-scale combustor. The first test evaluated a reburn fuel mixture comprising lignite and air-dried, raw hog manure. The second test evaluated a reburn fuel mixture made of lignite and the processed hog manure. Neither reburn fuel reduced NO{sub x} levels in the combustor flue gas. Increased slagging and ash deposition were observed during both reburn tests. The material-handling and ash-fouling issues encountered during this study indicate that the use of waste-based reburn fuels could pose practical difficulties in implementation on a larger scale.