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Hydrogen production by reaction of aluminum with water
Shmelev, V.,Nikolaev, V.,Lee, J.H.,Yim, C. Pergamon Press 2016 International journal of hydrogen energy Vol.41 No.38
<P>The hydrogen production by reaction of aluminum foils and powders with KOH aqueous alkaline solutions was studied. Effect of different physical factors on the specific hydrogen production rate was analyzed. The efficiency of activation of aluminum by copper was examined. Three variants of contacting copper with aluminum were considered: 1) preliminary chemical coating of the aluminum surface, 2) embedding copper into the melt of aluminum or pressing the aluminum - copper powder mixture, 3) continuous supplying copper to the aluminum surface during the reaction. The results showed that presence of copper on the surface or in the bulk of aluminum essentially increased the effective hydrogen production rate. The filtration corrosion in pressed aluminum powder was found. Hydrogen production at reaction of aluminum with NaCl + CuSO4 solutions was studied. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</P>
Hydrogen generation by reaction of molten aluminum with water steam
Shmelev, V.,Yang, H.,Yim, C. Pergamon Press 2016 International journal of hydrogen energy Vol.41 No.33
<P>Possibility of effective hydrogen generation by the water steam barbotage through the aluminum melt was demonstrated experimentally. The reactor was created and a burner device with the volumetric matrix was used for melting of aluminum and generation of water steam in the reactor. The hydrogen generation regimes were analyzed. The maximum hydrogen yield of 40% was reached for steam flow rate not above than 0.01 g/s. Admixture of 10wt % KOH in aluminum increased the hydrogen yield up to 100%. The comparative experiments with air bubbling through water were carried out and it was shown that the principal limitation on the hydrogen generation efficiency for higher steam flow rates was caused by development of the bubbling instability such as a coalescence of steam bubbles and occurrence of the steam breakthrough through the melt. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</P>
Plasma Discharge Initiation of Explosives in Rock Blasting Application
채재우(Jae-Ou Chae),푸치코프 발렌틴(Poutchkov V M),정영준(Jeong Young-Jun),바이쿤타차 라비(V Ravi),최인철(In-Chul Choi),이창민(Chang Min Lee),곽용환(Yong-Hwan Kwak),구형준(Hyung-Joon Koo),쉬멜레프(Shmelev V M),데니쉐프(Denicaev A.A),김남수(Kim 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The reliable plasma discharge initiation system for the explosive volumetric combustion charge has been designed, investigated and developed for the practical application. Laboratory scale experiments were carried out before conducting the large scale field tests. The resultant explosions gave rise to less noise, no seismic vibration and good specific explosive consumption for rock blasting. Importantly, the technique was found to be safe and environmental friendly.
금속분말 연소기의 slag 제거기법 개념 설계 및 Water Film 형성 조건 기초실험
김광연(Kwangyeon Kim),V. Shmelev,고현(Hyun Ko),이성웅(Sungwoong Lee),조용호(Yongho Cho) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
금속분말을 연료로 하는 연소기 개발에 있어 발생하는 문제점 중에 하나는 알루미나 slag 처리이다. 연소기 내부에 Water film을 형성시킴으로써 금속분말 연소기의 문제점을 해결할 수 있을 것으로 기대한다. 이를 위한 선행연구로 water film의 형성 조건에 대한 실험을 수행하였다. 실험 모델에 대하여 물 분사 속도가 증가할수록 원형 모델에 대한 water fim 각도가 작아져, 약 10 m/s이상에서 완전한 water film이 형성되는 것을 알 수 있었다. One of the issues that occurs in development of a combustor using Metal Powder as a fuel is an alumina slag processing. A water film formed inside the combustor is expected to be able to solve this issue. The experiments about the formation of a water film were carried out as a preliminary study. As the tangential velocity of water jet is increasing, the angle derivation from horizontal is decreasing for the test model. Results of the experiments showed that the thin water film on the inner surface appeared at the velocity of 10~15 m/s.