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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.
Grit와 Air의 혼합비 최적화를 통한 블라스팅 효율 향상
배한진(Han-Jin Bae),백재진(Jae-Jin Baek),김을현(Eul-Hyun Kim),정몽규(Mong-Ku Chung),신칠석(Chil-Seok Shin),백광기(Kwang-Ki Baek) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Achieving the maximum blasting efficiency with minimum abrasive consumption is a critical concern in surface preparation stage of shipbuilding and offshore industry. Increasing the abrasive flow rate beyond the optimum point results in a major reduction in productivity even though the amount of abrasive used is larger. So, this study is intend to find out the optimum abrasive-to-air mixing ratio which can make a significant improvement in blasting efficiency and remarkably reduce the amount of abrasive used. From the test results, it can be identified that as the abrasive feeding rate is increased linearly, blasting efficiency is increased to a maximum point and then gradually decreased in the form of a bell-shaped.
박대원,박상욱,양삼석,이성수,백재진 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.2
회분식 고분자중합 반응기에서 Na₂S₂O₄ 수용액상과 CCl₄ 유기상 접촉계면을 통한 액-액 불균일상계에서 tricaprylmethyl-ammonium chloride 상이동촉매를 사용하여 25℃, 질소기류하에서 acrylonitrile과 methylmethacrylate 단량체의 공중합반응을 행하여 초기 공중합 반응속도를 측정하였다. 측정한 초기 공중합속도를 사용하여 액-액 불균일계 접촉계면을 통한 공중합 반응에서 공중합 반응기구를 해석하였으며, 이로부터 단량체의 반응성비를 구하였다. 재래적으로 사용하는 Kelen-Tu¨do¨s법 및 Fireman-Ross법으로 구한 값과 비교하였으며, M₁과 M₂에 대한 반응성비는 각각 0.11과 2.30이었다. The phase-transfer radical copolymerization of acrylonitrile with methylmethacrylate by tricaprylmethyl-ammonium chloride were investigated in a Na₂S₂O₄ aqueous-CCl₄ organic two-phase system at 25℃ and under nitrogen atmosphere. The monomer reactivity ratios, r₁ and r₂ were obtained by the copolymerization mechanism with a cyclic phase-transfer initiation step and compared with those obtained by using the Kelen-Tu¨do¨s method and Fineman-Ross method. Their values were 0.11 and 2.30, respectively.
박대원,박상욱,양삼석,이성수,백재진 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.2
회분식 고분자 중합반응기에서 Na₂S₂O₄ 수용액상과 CCl₄ 유기상 접촉계면을 통한 액-액 불균일상계에서 tricaprylmethyl-ammonium chloride 상이동촉매를 사용하여 25℃, 질소기류하에서 acrylonitrile과 methylmethacrylate 단량체의 공중합 반응 실험을 행하여 초기 공중합속도를 측정하였다. 초기 공중합속도는 상이동촉매와 Na₂S₂O₄의 초기 농도항으로 나타내기보다는 수용액상에 존재하는 상이동촉매와 S₂O₄^(-2) 이온농도가 결합된 항으로 나타낸 [Q^+]_w[S₂O₄^(-2)]_w^½와 CCl₄의 제곱근과 단량체의 공급농도비에 정비례하였다. 측정한 초기 공중합속도를 사용하여 액-액 불균일계 접촉계면을 통한 공중합 반응기구를 해석하였다. The phase-transfer radical copolymerization of acrylonitrile with methylmethacrylate by tricaprylmethyl-ammonium chloride were investigated in a Na₂S₂O₄ aqueous-CCl₄organic two-phase system at 25℃ and under nitrogen atmosphere. The initial rate of copolymerization was found to be proportional to the concentration of [Q^+]_w, [S₂O₄^(-2)]_w^½, [CCl₄]_φ^½ and the molar ratio of feed of monomers. The observed initial rates of copolymerization were used to analyzed the copolymerization mechanism proposed with a cyclic phase-transfer initiation step.