• 한국산림과학회지
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• 제104권2호
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• pp.198-205
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• 2015

본 연구에서는, 수종별 벌채부산물의 압축 변형 특성을 규명함으로써 벌채부산물을 압축할 수 있는 장비의 개발을 위한 기초자료로 사용하고자 하였다. 만능재료시험기(Universial Testing Machine)를 이용한 압축재하 시험장치로 벌채부산물의 3회 반복 압축-변형 특성시험을 통해 수종별 벌채부산물의 목표밀도 압축에 필요한 소요압축력을 구하였다. 리기다소나무(Pinus rigida), 잣나무(Pinus koraiensis), 신갈나무(Quercus mongolica)의 반복 압축 시 응력-변형률 자료를 기반으로 지수함수 형태로 모델화한 것의 물리적 특성 값을 분석한 결과, 목표밀도 $350kg/m^3$과 $400kg/m^3$ 모두 벌채부산물 기계적 성질에 따른 응력계수는 압축횟수가 늘어나면서 줄어드는 경향을 나타냈으며, 반대로 변형율 계수는 늘어나는 경향을 나타냈다. 모델화를 통해 압축횟수가 증가할수록 압축에 요구되는 소요응력은 줄어들고, 변형율 변화에 비해 응력증가가 커지는 특성이 있으므로, 적절한 초기 압축력이 벌채부산물의 목표밀도 달성에 중요한 변수임을 확인할 수 있었다.

• Journal of Forest and Environmental Science
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• 제29권1호
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• pp.81-89
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• 2013

Nowadays, excessive using of fossil fuel contributes to global warming. Also, this phenomenon increases steadily. Therefore forest biomass from logging residues has received attention. The goal of this study was to determine the sustainability and economic feasibility of forest-biomass energy source. Accordingly, forest biomass resource was calculated, and harvesting and transporting machines which can be used in investing area were chosen, when using forest biomass as energy source. And then through these data, the harvesting cost was decided. The forest biomass resource calculated, thinned trees and logging residues, was 37,330.23 $m^3$ and 14,073.60 ton, respectively. When harvesting timber in each sub-compartment, the average thinned trees yield was 120.73 $m^3$, and tree logging residues was 402.80 ton. The use of tower yarder as harvesting and transporting equipments in study area was 85.4% and 66.7%, respectively, in up hill and down hill yarding. The average harvesting cost of biomass in the possibility area of timber yarding operation was expensive as 81,757 won/$m^3$, 85,434 won/m3 and 50,003 won/ton, respectively, in thinned trees and logging residue. If using data from this research analysis, tree could be felled by choosing sub-compartment.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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• pp.375-378
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• 2014

In this study, we carried out torrefaction experiment using PKS(Palm Kernel Shell), and Bagasse as a raw material of oversee of herbaceous biomass and using waste wood and logging residue as a raw material of domestic of woody biomass. And then, by analyzing the physical & chemical properties, we investigated the characteristics as a fuel. By using the result of thermo gravimetric analysis, the biomass residue was torrefied for 30 minutes at a temperature range of $250-350^{\circ}C$ in anaerobic condition. As a result, torrefied materials of moisture content are lower than raw, but of fixed carbon, calorific value and ash are higher than raw.

• 농업과학연구
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• 제49권2호
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• pp.317-330
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• 2022

Recently, the policy regarding climate change in Korea and overseas has been to promote the utilization of forest biomass to achieve net zero emissions. In addition, with the implementation of the unused forest biomass system in 2018, the size of the Korean market for manufacturing wood pellets and wood chips using unused forest biomass is rapidly expanding. Therefore, it is necessary to estimate the total amount of unused forest biomass that can be used as an energy source and to identify the capacity that can be continuously produced annually. In this study, we estimated the actual forest area that can be produced of logging residue and the potential amount of unused forest biomass resources based on GT (green ton). Using a forest functions classification map (1 : 25,000), 5th digital forest type map (1 : 25,000), and digital elevation model (DEM), the forest area with a slope of 30° or less and mountain ridges of 70% or less was estimated based on production forest and IV age class or more. The total forest area where unused forest biomass can be produced was estimated to be 1,453,047 ha. Based on GT, the total amount of unused forest biomass potential resources in Korea was estimated to be 117,741,436 tons. By forest type, coniferous forests were estimated to be 48,513,580 tons (41.2%), broad-leaved forests 27,419,391 tons (23.3%), and mixed forests 41,808,465 tons (35.5%). Data from this research analysis can be used as basic data to estimate commercial use of unused forest biomass.

• 한국산림과학회지
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• 제110권2호
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• pp.217-232
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• 2021

본 연구는 목재수확방법에 따른 단목수확시스템과 전목수확시스템으로 구분하여 벌채부산물 수집 및 가공작업의 생산성과 비용을 산출하고, 생산된 목재칩의 연료 특성을 비교 분석하여 목재칩 등급을 분류하고 에너지 시설에 연료 조건이 적합한지를 검토하였다. 벌채부산물 목재칩의 시스템 생산성 및 총 비용은 단목이 1.6 Gwt/SMH, 89,865 won/Gwt이었고, 전목은 2.9 Gwt/SMH, 72,974 won/Gwt로 단목에 비해 목재칩 생산성이 1.3배 높았고, 비용은 18.7% 절감되었다. 벌채 부산물 목재칩은 국제표준과 국내기준으로 단목의 목재칩은 등급에 적합하지 않았지만 선별처리를 통해 품질이 A2와 2급으로 향상되었다. 전목은 선별전 목재칩이 국내기준 2급이었으나 국제표준에 적합하지 않았고, 선별처리를 통해 A2 등급으로 향상 되었다. 또한 에너지 시설을 대상으로 Plant A는 단목의 선별전을 제외한 모든 목재칩이 건조처리를 통해 이용가능하였고, 전목 선별전 목재칩이 99,408 won/Gwt으로 가장 비용이 낮았다. 별도의 건조처리가 요구되지 않은 Plant B, C, D는 전목 선별전 목재칩이 57,204 won/Gwt으로 가장 비용이 낮았다. 따라서 벌채부산물을 이용하기 위해 전목수확시스템의 적용과 목재칩 품질 향상을 통해 에너지 이용시설에 적합한 목재칩을 생산할 수 있을 것으로 판단된다.