鹽基性 炭酸 마그네슘의 熱分解

全相文 大田工業專門大學 1983 論文集 Vol.33 No.-

The thermal decomposition of basic magnesium carbonates, hydromagnesite 4 MgCO_3·Mg(OH)_2·4H_2O and nesquchonite MgCO_3·3H_2O, was Studied 353 function Of temperature by a differential thermal gas analysis technique under various partial pressures of carbon dioxide(Pco_2). The decarbonation was strongly affected by Pco_2. Only one peak was observed in helium atmosphere for the avolution of carbon dioxide. At higher Pco_2 (Pco_2≥0.20 atm) three distinct decomposition stages were evident on DTGA curves at approximately 400-500, 520 and 530-650℃. The second stage corresponded to a rapid gas evolution (approximately, 5-10% of the totally evolved carbon dioxide) occurred coincidently with a sharp exothermic phenomenon. Its peak temperature was not affected by Pco_2 . The other stages involved' slow gas evolutions (endothermic phenomena) whose peak temperatures increased with increasing Pco_2. Power X-ray diffraction showed an amorphous pattern at 500℃ and MgCO_3 pattern at 525℃. It was concluded that the crystallization of MgCO_3 from the amorphous phase was responsible for the evolution of heal. by which the crystallized MgCO_3 became decomposed to cause the rapid gas evolution.

영어 회화 학습을 위한 스마트폰 기능성 게임 설계 및 구현

전상문(Sang-Moon Jeon),김경수(Kyoung-Su Kim),이갑형(Gap-Pyoung Lee) 한국디지털콘텐츠학회 2013 한국디지털콘텐츠학회논문지 Vol.14 No.2

Sodium imidobis (Sulfate) and Potassium imidobis (Sulfate)의 熱分解에 관한 硏究

全相文 大田工業專門大學 1982 論文集 Vol.31 No.-

태양열 온수급탕 시스템에 관한 연구

전상문,김종식 啓明大學校 産業技術硏究所 1997 産業技術硏究所 論文報告集 Vol.19 No.2

To develop hot water generating system using solar energy. The collectors, black crome plating and carbonblack have been applied in cheaper and simpler processes, and sillicon oil has coated for the double glass effect as well as the absorption of radiant heat. The wood, processed with special chemicals, not Aluminum, has been used for the cases of collectors without any welding between copper plates and copper pipes. The thermal energy storages, cheap polyethyllene tank of over 3 drum volume, have been used instead of the current expensive thermal energy storages, and heat carriers have been circulated forcefully by both check values and low power pumps. Na₂SO₄·10H₂O has been packed with special plastic materials and put into the thermal energy storages, which has brought about the thermal energy storage effect.

熱擴散管에 의한 黃化水素의 分解와 生成水素의 濃縮

全相文 大田開放大學 1986 論文集 Vol.5 No.-

By using a thermal diffusion column a; a reactor, catalytic decomposition of hydrogen sulfide and enrichment of the produced hydrogen by one process were attempted. We expected that a reaction accompanied with continuous separation of the products, i.e., hydrogen and sulfur, could increase the hydrogen yield in comparison with the reaction carried out in an ordinary reactor having homogeneous temperature distribution. Three thermal diffusion columns made of pyrex glass tubes and equipped with a quartz pipe heater were used (Fig.1 and Table.1) suface of the hot wail was coated with catalysts us chromiun sulfide, cobalt sulfide, nickel sulfide or iron sulfide. Measurement was carried out in a batch system, maximum presure reaching ca. 1.5 atm. The initial activity of tile catalysts at the hot wall temperature (Th) of 500℃ in column C was in the following order: chromium sulfide > cobat sulfide > nickel sulfide > iron sulfide (Fig.3). Catalytic activity did not decrease during a 30 - 40 hrs operation. Separation of hydrogen from hydrogen / hydroge sulfide mixture (fig.2) and effects of the hot wall temperature and the wall distans (Fig.4) were also studied. In addition, the distribution of hydrogen concentration along the column was determined on column A (Fig.5). The results agreed with the expectatior: e.g, 40% hydrogen sulfide was decomposed and 90% hydrogen was obtained from the top of the thermal diffusion column in the best operating conditions (column A, Th=500℃, catalyst=chromium sulfide).

HEAD LOSSES IN PIPE FITTINGS AT LOW REYNOLDS NUMBERS

全相文 大田工業大學 1989 한밭대학교 논문집 Vol.6 No.2

Newtonian 및 비 Newtonian 범위에 있는 유체가 elbows, valves, Contrations판을 통하여 흐를 때 나타나는 마찰 수두 손실이 측정되었다. 그 결과, 모든 데이타는 손실계수와 일반화한 Reynolds number의 관계로 표현하는 것이 가능하였다. 층류 영역에서는 손실 계수는 Reynolds number에 반비례하였으며, 높은 Reynolds number에서는 손실 계수가 일정해지는 영역에서 바른 전이가 관찰되었다. 층류와 전이 영역 실험 데이타는 설계목적에 사용될 수 있으나 산업현장에서 사용하는 관 부속의 범위에 적용을 위해서는 더욱 많은 데이타가 필요한 것으로 판단된다. Measurement are reported of the frictional head loss which is in curred when a range of Newtonian and non-Newtonian fluids flow through elbows, valves contractions. It is shown that it is possible to present all the data as relationships between the loss coefficient and a generalised Reynolds number. In the laminar region the loss coefficient is inversely proportional to the Reynolds number, at higher Reynolds numbers a rapid transition is oberved to a region in which the loss coefficinal becomes constant. The experimental data presented in the laminar and transition region can be used for design purposes. However, more data are required to cover the full range of fittings encountered in industry.

忠州市를 中心으로 한 水質分析

全相文 忠州大學校 1974 한국교통대학교 논문집 Vol.7 No.-

The auther has analyzed water sampling from the following locations; the upper part of the Han river and the Dalcheon river in the Chung Ju District. The analytical results are as the following: 1) The contents of Calciumk ion and Magnesium ion in the limestone zone are higher than those in the granite zone. 2) The pH value of water in the limestone zone was higher than that of water in the granite zone. 3) Water of the Dalcheon river is wable for the textile plants. 4) Water for all the industrial factories should be pruified by the Zeolite softening process, the ionic exchange method of the lime-soda process.

수화물을 사용한 축열 연구

全相文 大田産業大學校 1995 한밭대학교 논문집 Vol.12 No.1

In view of the shortage of the energy resource in this country and efficient use of the energy, it is important to develop a system of the chemical heat storage. Ca(OH)_2/CaO used as the specimen of the reversible thermochemical reaction cycle, in this study, thermochemical reaction cycle were studied form a fundamental point of view with various kinds of limestone. The reaction rate of the thermochemical reaction cycle was measured using a micro-thermobalance equipped with steam generator. In the present study, it was found that the magnesium oxide of the calcilned dolomite was not hydrated during the hydration process under the studied experimental conditions. The magnesium oxide of the calcined dolomite was regarded as an inert material for modelling reaction kinetics. It is necessary to select the optimal type of heat recovery device using the reversible thermochemical reaction cycle of Ca(OH)_2/CaO and to improve the production process of Ca(OH)_2. The experimental apparatus is a packed bed shape which is suitable to optimal type of heat recovery device. The heat and mass transfer of heat stoage process in the regenerative heat exchanger of the packed bed can be applied to the development of dying process etc... The reaction Characteristics of heat release process for the hydration of CaO can be used to improve the process of Ca(OH)_2.

PAN계 활성탄소 섬유의 제조 및 물성에 관한 연구

全相文 大田工業大學 1992 한밭대학교 논문집 Vol.9 No.1

Thermogravimetric analysis (TGA) measurement have been carried out to investigate the stbilization, carbonization and activation under H_2O(30%)-N_2 Atomsphere of copolymer of acrylonitrile(95 w%) and methyl acrylate (5 w%) at various heating rates. The cyclization and dehydrogenation during the stabilization were important factors to determine physical properties of activated carbon fiber. The pore volime and the specific surface area during the carbonization began to develope at the temperature higher than 400℃. The kinetic equation {f=1-exp(-a △ T b)} which was derived for the non-isothermal activation process of carbon fiber-H_2O(30 w%)-N_2 system showed good agree- ment whth the experimental results and the apparent activation energy based on the parameters of a and b was 95-127KJ/mo1. The pore volume upon conversion was in good agreement with the model of theoreti- cal pore volume, and the pore structure of the activated carbon fiber were influenced by the heating rate, activation temperture and internal and external conversion.

태양열 건조기에 관한 연구

전상문 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.1

To develop heating water that is high efficiency and lower price, natural conveclive soalr energy system which is puling onmarkt modiket convectire solar energy system. For the cast down of maunfacture and increasing of the system efficency, brazen pipe in heat exchanger of rediation correction system switched to smaller size, collector with brazen switched to aluminum film which is 70μ thickness, and doped with silicon carbonblack high priced heat storage thak subsituted to low priced polyethylene drum, and reconstructed heat exchanger with staituted to low priced polyethylene drum, and reconsrucbed heat exchanger with stainless steel which is attached fins and check valve for forced convection of heat transfer media. For enhancement of heat storage efficiency poly propylene bag with Na_2SO_4 hydration heat. The solar energy system which is improved in this research was simple manufactring porcess and increase of heat efficiency due to forced convection system. In this results, it can be conclude that this system is move valuable in economically than conventional solar energy system.