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신상룡(Sang-ryong Shin),이윤식(Yun-sik Lee),이지형(Ji-hyung Lee),노태양(Tae-yang Noh),염두식(Doo-sik Yeom),전병진(Byung-Jin Jeun) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
During the manufacturing process of a propeller for a large scale commercial ships, several times of turn-over process should be required. Propeller turn-over is a indispensible process but not easy because of its heavy weight and complicate shape. Recently, we developed a new type of turn-over system for a large scale propeller. The system consists of turning roller devices, sliding transfer system, clamping devices and so on. In this paper, we described the design process which includes mechanical structure design, dynamic analysis and assembly with a laser tracker.
해조류 첨가를 통한 음식물쓰레기의 혐기성소화 효율 증대
신상룡(Sang Ryong Shin),이모권(Mo Kwon Lee),권오태(Oh Tae Kwon),김지훈(Ji Hoon Kim),한규현(Gyu Hyeon Han),김동훈(Dong Hoon Kim) 유기성자원학회 2017 유기물자원화 Vol.25 No.3
본 연구는 해조류 첨가를 통한 음식물쓰레기의 소화효율 증대효과를 알아보기 위해 다양한 농도(2.5∼10.0 g VS/L)와 혼합비율(FW:SW=100:0, 75:25, 50:50, 25:75, 0:100, VS 농도 기준)에서 회분식 실험을 수행하였다. 음식물쓰레기의 단일소화의 경우 농도가 증가함(2.5∼10.0 g VS/L)에 따라 메탄전환율이 394, 377, 276, 49mL CH4/g VSadded로 감소하는 경향을 보였다. 음식물쓰레기에 해조류의 첨가 비율이 높아질수록 낮은 기질농도(2.5∼5.0 g VS/L)에서는 메탄전환율이 감소하였으나(최대 15% 감소) 높은 기질농도(7.5∼10.0 g VS/L)에서는 메탄전환율이 증가하였다(최대 240% 상승). 또한 음식물쓰레기와 해조류의 단일소화 시 발생된 메탄가스의 양을 기반으로 상승효과에 의한 메탄발생량을 계산한 결과, 2.5, 5.0 g VS/L에서는 상승효과가 없었고, 7.5, 10.0 g VS/L의 경우에는 해조류의 비율이 높아질수록 상승효과가 최대 25 % (= 상승효과에 의한 메탄발생량/혼합소화 시 실제 발생한 메탄발생량, 기질농도 10.0 g VS/L, 혼합비율 50:50)까지 상승하였다. 음식물쓰레기의 농도가 10.0 g VS/L로 높은 경우 단일소화 시(FW=SW=100:0) 유기산 축적량이 7,426 mg COD/L까지 증가하였고, 해조류를 첨가하면(FW:SW=50:50) 유기산 축적량이 2,346 mg COD/L로 감소하였다. 이는 비교적 생분해도가 낮은 해조류를 첨가함으로서 유기산 생산속도의 조절을 통해 유기산이 축적되는 것을 억제하여 상승효과가 발생한 것으로 판단된다. In this study, we investigated the effect of seaweed (SW) addition on the anaerobic digestion of food waste (FW). Anaerobic batch experiments were carried out at various substrate concentrations (2.5 to 10.0 g VS/L) and mixing ratios (FW:SW=100:0, 75:25, 50:50, 25:75 and 0:100 on VS basis) of FW and SW. The methane yield of FW alone was 394, 377, 276, 49 mL CH4/g VSadded at each substrate concentration (2.5 to 10.0 g VS/L). In cases of co-digestion, methane yield decreased (up to 15 %) with increasing mixing ratio of SW at low substrate concentration (2.5 to 5.0 g VS/L), while it increased (up to 240 %) at high substrate concentration (7.5 to 10.0 g VS/L). The synergistic effect was calculated based on the amount of methane generated from the single-feedstock digestion of FW and SW. The synergistic effect was not found at 2.5 and 5.0 g VS/L. However, the synergistic effect increased (up to 25% = synergistic increment/total methane production at 10.0 g VS/L, FW:SW=50:50) with increasing the ratio of seaweed at 7.5 and 10.0 g VS/L. At 10.0 g VS/L of FW alone, the accumulated amount of organic acids was 7,426 mg COD/L, which was decreased to 2,346 mg COD/L by seaweed (FW:SW=50:50) addition. The reason for the synergistic effect was to control the production rate of the organic acids by adding SW that has a relatively lower biodegradability compared to FW.
신상룡(Sang Ryong Shin),이모권(Mo Kwon Lee),김민균(Min Gyun Kim),홍성민(Seong Min Hong),김동훈(Dong Hoon Kim) 유기성자원학회 2017 유기물자원화 Vol.25 No.1
본 연구에서는 하수슬러지의 유기산 생산에 있어 해조류 첨가를 통한 상승효과를 확인하고자 새로운 접근을 시도하였다. 기질농도를 동일하게 20 g COD/L로 하고 하수슬러지와 해조류의 혼합비율을 COD 기준, 100:0, 75:25, 50:50, 25:75, 0:100으로 조절하여 실험하였다. 실험 온도는 35℃, 중온에서 이루어졌고 메탄생산균의 활성을 억제하기 위해서 90℃, 20분간 열처리된 혐기성소화슬러지를 식종균으로 이용하였다. 실험결과를 살펴보면, 해조류의 첨가량이 증가할수록 유기산의 농도도 증가하는 경향을 나타내었으며 혼합비율별 100:0, 75:25, 50:50, 25:75, 0:100 (하수슬러지:해조류) 유기산 생산량은 각각 1.45, 3.22, 4.28, 5.24, 4.82g COD/L이었다. 하수슬러지와 해조류만의 유기산 생산량을 기반으로 하여 상승효과를 계산한 결과, 혼합비율 75:25, 50:50, 25:75 에서 각각 0.92, 1.14, 1.26 g COD/L로 나타났다. 이는 해조류가 25% 비율로 첨가 시 전체 생산된 유기산의 40%가 상승효과에 의해 생산되었음을 의미하며, 해조류의 상대적인 높은 C/N비와 생분해도에 기인한다. In the present work, the synergistic effect of seaweed addition on organic acid production from sludge was investigated. The batch experiment was conducted at various mixing ratios of sewage sludge and seaweed (100:0, 75:25, 50:50, 25:75, 0:100 on a COD basis) under the substrate concentration of 20 g COD/L. The fermentation temperature was conducted under mesophilic condition (35℃) and a heat-treated (90℃ for 20 min) anaerobic digester sludge was used as a seeding source to suppress the methanogenic activity, The results showed that the amount of organic acid production increased as the content of seaweed increased: organic acids were 1.45, 3.22, 4.28, 5.24 and 4.82 g COD/L for the mixing ratio of 100:0, 75:25, 50:50, 25:75 and 0:100 respectively. The synergistic effect was calculated based on the organic acid production of individual sludge and seaweed, and was found to be 0.92, 1.14, 1.26 g COD/L at the mixing ratio of 75:25, 50:50 and 25:75, which indicates that 40% of synergy was obtained when 25% of seaweed was added. The synergistic effect could be ascribed to the high C/N ratio and biodegradability of seaweed.
음식물류폐기물 수소 발효액의 유변학적 특성과 교반강도 고찰
김민균(Min-Gyun Kim),이모권(Mo-Kwon Lee),임성원(Seong-Won Im),신상룡(Sang-Ryong Shin),김동훈(Dong-Hoon Kim) 유기성자원학회 2017 유기물자원화 Vol.25 No.4
점도, 임펠러 종류, 소비전력 등에 의해 영향을 받는 생물학적 폐기물 처리시설 및 에너지 생산 플랜트에서 적절한 교반 시스템의 설계는 필수적이다. 본 연구에서는 적절한 교반 시스템의 설계를 위해 음식물류폐기물을 이용하여 다양한 조건(운전 pH 및 농도)에서의 수소발효 시 유변학적 특성의 변화를 조사한 후, 이를 기반으로 교반강도를 설계하였다. 운전 pH에 따른 수소발효 실험에서 수소전환율은 0.51~1.77 mol H 2 /mol hexose added 였고, 가장 높은 수소전환율은 운전 pH 5.5에서 나타났다. 발효액은 전단속도가 증가함에 따라 점도가 감소하는 Shear thinning 거동을 보였다. 탄수화물이 분해되면서 발효 이후 점도는 초기 점도보다 감소하는 경향을 보였으나, 운전 pH의 변화에 따른 발효액의 점도 변화는 크지 않았다. 탄수화물 농도 10~50 g Carbo. COD/L에서 수소전환율은 1.40~1.86 mol H 2 /mol hexose added 로 운전 pH 조건이 수소전환율에 미친 영향과 비교했을 때 큰 차이는 없었다. 발효액의 Zero viscosity와 Infinite viscosity는 탄수화물 농도에 따라 각각 10.4~346.2 mPa‧s와 1.7~5.3 mPa‧s로 나타났는데, 10 g Carbo. COD/L와 20 g Carbo. COD/L에서 발효액의 점도 값은 거의 차이가 없었다. 실험 결과에 기초하여 교반강도를 설계한 결과, 기질농도 30 g Carbo. COD/L의 수소발효 초기 및 발효 후 교반강도는 각각 26.0, 10.0 rpm으로 약 2.5배 정도의 교반강도를 줄임으로써 에너지를 절약할 수 있을 것으로 사료된다. The design of proper agitation system is requisite in biological waste treatment and energy generation plant, which is affected by viscosity, impeller types, and power consumption. In the present work, hydrogen fermentation of food waste was conducted at various operational pHs (4.5~6.5) and substrate concentrations (10~50 g Carbo. COD/L), and the viscosity of fermented broth was analyzed. The H 2 yield significantly varied from 0.51 to 1.77 mol H 2 /mol hexose added depending on the pH value, where the highest performance was achieved at pH 5.5. The viscosity gradually dropped with shear rate increase, indicating a shear thinning property. With the disintegration of carbohydrate, the viscosity dropped after fermentation, but it did not change depending on the operational pH. At the same pH level, the H 2 yield was not affected much, ranging 1.40~1.86 mol H 2 /mol hexose added at 10~50 g Carbo. COD/L. The zero viscosity and infinite viscosity of fermented broth increased with substrate concentrations, from 10.4 to 346.2 mPa‧s, and from 1.7 to 5.3 mPa‧s, respectively. There was little difference in the viscosity value of fermented broth at 10 and 20 g Carbo. COD/L. As a result of designing the agitation intensity based on the experimental results, it is expected that the agitation intensity can be reduced during hydrogen fermentation. The initial and final agitation intensity of 30 g Carbo. COD/L in hydrogen fermentation were 26.0 and 10.0 rpm, respectively. As fermentation went on, the viscosity gradually decreased, indicating that the power consumption for agitation of food waste can be reduced.
백재진(Jae-Jin Baek),윤원준(Won-Jun Yun),이채석(Chae-seok Lee),정몽규(Mong-Ku Chung),신상룡(Sang-ryong Shin),권혁준(hyeog-jun kwon),이병헌(Byung-Hun Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
A significant amount of labor hour is being spent for clean up spent abrasives after blasting. So, for improving the efficiency of abrasive(grit) recovery process which acts as the neck of a battle in preceding coating stage, it was established the theoretical background for pneumatic transport technology in the abrasive recovery system as well as experimentally evaluated the effect of design parameters such as flow pattern, saltation<br/> velocity and pressure drop on the efficiency of the abrasive recovery system. And, by optimizing the operating parameter such as the length and diameter of suction hose, specification of recovery device, recovery mouth and hose connection method, a method which can dramatically increase the efficiency of abrasive recovery system, is derived.