Details

Autor(en) / Beteiligte

• Kluska, Jacek
• Kazimierski, Pawei
• Ochnio, Mateusz
• Kardas, Dariusz

Titel

Influence of Bed Movement and Amount of Supplied Air on Updraft Gasification of Hardwood Pellet/Utjecaj pomaka tepiha materijala i dobave zraka na protusmjerno rasplinjavanje peleta od drva listaca

Ist Teil von

• Drvna industrija, 2018-12, Vol.69 (4), p.339

Ort / Verlag

Sveuciliste U Zagrebu

Erscheinungsjahr

2018

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• This work presents the results of hardwood pellet gasification with different amounts of air as a gasification medium. The effects of bed movement and the equivalence ratio (ER) on the temperature profile, gas composition, carbon conversion efficiency and the energy balance were taken into account. Slow movement of the bed promotes high combustion and reduction zones, while fast bed movement leads to high pyrolysis zones and higher caloric values of syngas. When the amount of air increased from 12 to 23 N[m.sup.3]/h, the gas yield increased from 1.4 to 1.6 N[m.sup.3]/[kg.sub. biomass] for slow bed movement, and from 1.0 to 1.3 N[m.sup.3]/[kg.sub. biomass] for fast bed movement. These results show that in both Cases similar specific energy values were obtained. However, in Case 1 lower fuel consumption was reached. Chemical energy in the syngas represents 80% of the output energy for slow bed movement (265 MJ/h) and 75% for fast bed movement (295 MJ/h). A significant effect of bed movement in the reactor suggests that the gasifier could be considered as a flow reactor, and additionally the fast movement of the bed with 20 N[m.sup.3]/h of supplied air yielded the highest-quality gasification process. Moreover, fast bed movement in the reactor leads to a high amount of generated char with high energy potential. Keywords: gasification, updraft gasifier, hardwood, carbon conversion, bed movement U radu su prikazani rezultati rasplinjavanja peleta od drva listaca razlicitim kolicinama zraka kao sredstvom za rasplinjavanje. U ispitivanju je uzet u obzir utjecaj pomaka tepiha materijala i omjera ekvivalencije (ER) na temperaturni profil, sastav plina i ucinkovitost pretvorbe ugljika te na energetsku ravnotezu. Usporeni pomak tepiha materijala pospjesuje zone dobrog izgaranja i redukcije, dok brzi pomak tepiha materijala rezultira visokim zonama pirolize i visim kalorijskim vrijednostima sintetskog plina. Kada je kolicina zraka porasla s 12 na 23 N[m.sup.3]/h, prinos plina povecao se s 1,4 na 1,6 N[m.sup.3]/[kg.sub.biomase] pri laganom pomaku tepiha materijala, a od 1,0 do 1,3 N[m.sup.3]/[kg.sub.biomase] pri brzom pomaku tepiha materijala. Ti rezultati pokazuju da su u oba primjera dobivene slicne vrijednosti specificne energije. Medutim, u prvom je primjeru postignuta niza potrosnja goriva. Kemijska energija u sintetskom plinu cini 80% izlazne energije pri laganom pomaku tepiha materijala (265 MJ/h) i 75% pri brzom pomaku tepiha materijala (295 MJ/h). Znatan ucinak pomaka tepiha materijala u reaktoru sugerira da se rasplinjac moze smatrati protocnim reaktorom, a dodatno brz pomak tepiha materijala s 20 N[m.sup.3]/h dobave zraka omogucio je najkvalitetniji proces rasplinjavanja. Stovise, brzi pomak tepiha materijala u reaktoru dovodi do nastanka velike kolicine pougljenjenog materijala s visokim energetskim potencijalom. Kljucne rijeci: rasplinjavanje, protusmjerni rasplinjac, drvo listaca, pretvorba ugljika, pomak tepiha materijala