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김정훈 ( Kim J. H. ),성환인 ( H. I. Sung ),최규성 ( K. S. Choi ),김종진 ( J. J. Kim ),원창오 ( C. O. Won ),송기선 ( K. S. Song ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2020 강원 농업생명환경연구 Vol.32 No.1
This study was conducted to survey the germination characteristics of the seeds of Larix kaempferi, which is a major plantation species in Korea, according to the storage period. The germination experiment was conducted at 25°C, targeting seeds collected in 1996, 2004, 2008, 2009, 2010, and 2011. Prior to the germination experiment, seeds were subjected to different soaking treatments for 1, 2, 3, and 7 days including non-treatment. The germination rate in L. kaempferi seeds was observed to be higher in those that were collected recently; that is, the seeds that were stored for a shorter period of time. The germination rate of the seeds collected in 2011, which were stored immediately after collection, was 20.7%. The seeds from 1996 and 2004 did not germinate at all. The seeds from the year 2008 showed the lowest germination rate at 2.7%. The whole T50 of the test-subjected seeds was observed to be 3-7 days. Germination uniformity tended to decrease with shorter storage period. Soaking treatment lowered the mean germination time and uniformity, except for the stored seeds (collected in 1996 and 2004), which did not germinate. Based on the results of these experiments, such as a reduction in germination rate according to the seed storage period, it seems likely that more detailed investigations into the changes in seed viability and storage management are needed with respect to L. kaempferi seeds.
체인스토커 방식 목재펠릿 증기보일러의 부하 별 연소 특성
장준환(J.H. Jang),김종진(J.J. Kim),최규성(K.S. Choi),강새별(S.B. Kang),심봉석(B.S. Sim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The goal of the present study is to develop a 1 ton/h-class chain stoker type wood pellet steam boiler. A series of investigations regarding combustion load characteristics of chain stoker type wood pellet steam boiler has been conducted. We have considered the load from 60% to 120%. The results show that a high temperature zone is at the entrance of the 2nd chamber for all combustion loads considered. The flame is stretched to the top of the 2nd chamber. The maximum efficiency is 85.1% at 100% load. The CO concentration in this case is 234 ppm. The exhaust gas oxygen concentration, the higher the exhaust gas temperature tends increased.