• Title/Summary/Keyword: Methanol absorber

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An Experimental Study on Absorber with Spiral Tube in Absorption Heat Pump (흡수열펌프에서 나선형 관이 설치된 흡수기의 실험적 연구)

  • Min, Byong-Hun
    • Applied Chemistry for Engineering
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    • v.21 no.1
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    • pp.71-75
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    • 2010
  • The efficient performance of absorber is of great importance for the absorption heat pump cycle. The experimental study of absorber with spiral tube of tangential feeding of liquid phase has been investigated using methanol-glycerine as a working fluid. The effect of change in absorber operating conditions was analyzed to improve the performance. The increase in solution flow rate and cooling flow rate positively affects the absorber performance while an increse in the solution concentration negatively affects the absorber performance. The results showed that mass absorption flux was in the range of $0.2{\sim}0.6kgm^{-2}sec^{-1}$, the solution heat transfer coefficient between 1.6 and $4.2kwm^{-2}K^{-1}$, the absorber thermal load from 0.9 to 1.5kw and the mass transfer coefficient from 0.9 to 1.7 m/sec.

A Study on Improvement of Performance of Absorber in Absorption Heat Pump (흡수열펌프에서 흡수기의 성능 개선 연구)

  • Min, Byong-Hun
    • Applied Chemistry for Engineering
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    • v.19 no.3
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    • pp.338-344
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    • 2008
  • The improvement of energy conservation is mandatory to decrease consumption of fossil fuels and to minimize negative impacts on the environment which originates from large cooling and heating demand. The absorption heat pump technology has a large potential for energy-saving in this respect. Absorption heat pump is a means to upgrade waste heat without the addition of extra thermal energy. The higher performance of absorber is of great importance for absorption heat pump cycle. In this study, in order to improve the performance of absorber, the absorber of tangential feed of a liquid phase with spiral tube has been investigated using methanol-glycerine as a working fluid. The spiral tube and tangential feeding generate the turbulence into the liquid flow while increasing the mass and heat transfer coefficients. The simultaneous heat and mass transfer were found to take place in a liquid turbulent film in the absorber with the spiral tube during the process of gas absorption. By calculating mass and heat transfer coefficients by measurement of the concentration and the temperature of each position in the absorber, the entrance was found to be more effective in enhancing mass and heat transfer.

A Study on Absorber in Absorption Heat Pump with Methanol-Glycerine System as a Working Fluid (메탄올-글리세린계를 작동유체로 하는 흡수열펌프에서 흡수기 연구)

  • Min, Byong-Hun
    • Applied Chemistry for Engineering
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    • v.17 no.1
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    • pp.111-117
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    • 2006
  • The improvement of energy conservation mandates decrease consumption of fossil fuels and minimize negative impacts on the environment, which originates from large cooling and heating demand. The absorption heat pump technology has a large potential for energy saving in this respect. Adsorption heat pump is a means to upgrade waste heat without addition of extra thermal energy. The increase of absorbed amount is of great importance for absorption heat pump cycle. In this study, in order to improve the performance of absorber, the absorbers of two different types have been investigated using methanol-glycerine as a working fluid. The former was tangential feed of liquid phase without spiral tube in the absorber and the latter was with spiral tube in the absorber. The latter was found to be more effective in enhancing the mass and heat transfer to increase the absorption performance.

The effects of Se evaporation temperature on CIS absorber layer fabricated by non-vacuum process (Se 증발온도가 비진공 공정으로 제조한 CIS 광흡수층에 미치는 영향)

  • Park, Myoung-Guk;Ahn, Se-Jin;Yoon, Jea-Ho;Yoon, Kyung-Hoon
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.441-443
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    • 2008
  • A non-vacuum process for fabrication of $CuInSe_2$ (CIS) absorber layer from the corresponding Cu, In solution precursors was described. Cu, In solution precursors was prepared by a room temperature colloidal route by reacting the starting materials $Cu(NO_3)_2$, $InCl_3$ and methanol. The Cu, In solution precursors were mixed with ethylcellulose as organic binder material for the rheology of the mixture to be adjusted for the doctor blade method. After depositing the mixture of Cu, In solution with binder on Mo/glass substrate, the samples were preheated on the hot plate in air to evaporate remaining solvents and to burn the organic binder material. Subsequently, the resultant CI/Mo/glass sample was selenized in Se evaporation in order to get a solar cell applicable dense CIS absorber layer. The CIS absorber layer selenized at $530^{\circ}C$ substrate temperature for 30 min with various Se gas evaporation temperature was characterized by XRD, SEM, EDS.

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Characteristics of CIGS film fabricated by non-vacuum process (비 진공으로 제작한 CIGS 박막 특성)

  • Park, Myoung-Guk;Ahn, Se-Jin;Yoon, Jea-Ho;Gwak, Ji-Hye;Kim, Dong-Hwan;Yoon, Kyung-Hoon
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.06a
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    • pp.19-22
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    • 2009
  • A non-vacuum process for fabrication of $CuIn_xGa_{1-x}Se_2$ (CIGS) absorber layer from the corresponing Cu, In, Ga solution precursors was described. Cu, In, Ga precursor solution was prepared by a room temperature colloidal route by reacting the starting materials $Cu(NO_3)_2$, $InCl_3$, $Ga(NO_3)$ and methanol. The Cu, In, Ga precursor solution was mixed with ethylcellulose as organic binder material for the rheology of the mixture to be adjusted for the doctor blade method. After depositing the mixture of Cu, In, Ga solution with binder on Mo/glass substrate, the samples were preheated on the hot plate in air to evaporate remaining solvents and to burn the organic binder material. Subsequently, the resultant CIG/Mo/glass sample was selenized in Se evaporation in order to get a solar cell applicable dense CIGS absorber layer. The CIGS absorber layer selenized at $530^{\circ}C$ substrate temperature for 1h with various metal organic ratio.

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SEPARATION AND PURIFICATION PROCESS OF DEMO PLANT FOR 10TON PER DAY DME PRODUCTION (일일 10톤 DME 생산 Demo Plant에서의 분리정제 공정)

  • Ra Young Jin;Cho Wonihl;Shin Dong Geun;Lim Gye Gue
    • 한국가스학회:학술대회논문집
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    • 2005.10a
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    • pp.141-145
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    • 2005
  • DME (Di-Methyl Ether) is a new clean fuel and an environmental-friendly energy resource, also is recently increasing with an alternative interest because of the industrial use. DME has been shown to have excellent properties as a diesel fuel giving emission level better than ULEV standard. So it has been attracting considerable as an alternative diesel fuel. In this study, we carried out simulation of separation and purification process of demo plant for 101on per day DME production, which cause the effect that is important in productivity, from operation results of pilot plant for 50kg per day DME production. The liquefied stream, which was separated by gas-liquid separator after DME reactor, includes $CO_2$, DME, Methanol and $H_2O$. We established three distillation columns for separation and purification of the stream. $CO_2$ was extracted from the stream by first distillation column, DME was extracted by second column and Methanol was extracted by third column. We investigated and analyzed the effect which the actual operation variables cause in efficiency of process and optimized process, finally we got the DME of purity $100\%$.

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A Study on Application of a Heat Pipe to an Evacuated Glass Tube Solar Collector (진공 유리관 태양열 집열기에 열파이프의 적용을 위한 기초 연구)

  • Kim, Chul-Joo
    • Solar Energy
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    • v.12 no.2
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    • pp.9-17
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    • 1992
  • This is an experimental work concerning about an application of a heat pipe to an evacuated-glass-tube solar collector system. A methanol heat pipe with length of 0.7 m and diameter of 8 mm was manufactured and tested to compare its performance with that of freon thermosyphon which was originally used in a solar collector system fabricated at Thermomax Co.. Then this methanol heat pipe was utilized to be one component, i.e. heat transfer element, of the present experimental model of a solar collector. This model was performed the operation test as its absorber plate was irradiated by infrared lamps. The following results were obtained. (1) The methanol heat pipe was showed a stable operation when the variation of axial heat transport was $0{\sim}40$ watts and that of inclination angle was $30{\sim}90^{\circ}$. (2) The heat transport capability of the heat pipe was proved to be higher than that of the thermosyphon, because the heat transport limitation of the latter was occured at about 30 watt. (3) The heat pipe in a solar collector was also showed good performance as it transmitted absorbed energy.

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A Study on the Thermodynamic Analysis and the Computer Simulation for the $CO_2$ and $H_{2}S$ Capture Process Using Methanol as a Solvent (메탄올 용매를 이용한 이산화탄소와 황화수소 포집공정의 열역학적 해석 및 전산모사에 관한 연구)

  • Cho, Jung-Ho;Lee, Ji-Hwan
    • Clean Technology
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    • v.14 no.4
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    • pp.287-292
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    • 2008
  • In this study, computer simulation works have been performed for the capture process of the $CO_2$ and $H_{2}S$ gases contained in the effluent stream using methanol aqueous solution. In order to increase the solubilities of the $CO_2$ and $H_{2}S$ in the methanol aqueous stream, the operating pressure of the absorber was raised to 30 bar and the feeding temperature of the solvent was lowered to $-20^{\circ}C$ by using refrigeration cycle. NRTL liquid activity coefficient model was used to estimate the liquid phase nonidealities for methanol and water. Soave-Redlich-Kwong equation of state was used for the vapor phase nonidealities. Henry's law option was also used to calculate the solubilities of the supercritical noncondensible gases into the methanol aqueous solvent stream.

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A Study on the Thermodynamic Analysis for the DME Separation Process (DME 분리공정의 열역학적 해석에 대한 연구)

  • Cho, Jung-Ho;Kim, Young-Woo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.2
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    • pp.590-596
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    • 2010
  • Through this study, we have attempted the thermodynamic analysis on the dimethyl ether (DME) separation process, which can be used for diesel alternative fuel, additive to LPG and natural gas. And we also have completed the simulation of DME separation process using PRO/II with PROVISION. As an appropriate thermodynamic models, we selected NRTL liquid activity coefficient model to describe the non-ideality between methanol and water. To estimate the vapor phase non-idealities, we have chosen the Peng-Robinson equation of state model. And we also use the Henry's law option to predict the solubilities of non-condensible gases like CO, $CO_2$, $H_2$, $CH_2$ and $N_2$ in methanol solvent. Case study showed that optimal solvent to feed molar ratio was 3.40

A Study for Carbon dioxide Removal Process Using Methanol Solvent in DME Manufacture Process (DME 생산공정에서 메탄올을 이용한 이산화탄소 제거 공정 연구)

  • Cho, Duhee;Rho, Jaehyun;Kim, Dong Sun;Cho, Jungho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.3
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    • pp.1502-1511
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    • 2013
  • In this study, simulation works have been performed for the modeling of $CO_2$ removal process contained in the DME production process through an absorber-stripper system using methanol aqueous solution. Aspen Plus release 7.3 in AspenTech company was utilized as a simulation tool and PC-SAFT modeling equation of state was used as a thermodynamic model. Fitting parameters built-in PC-SAFT model was determined by regressing experimental data, predicted results using PC-SAFT model were compared with experimental data in order to verify the exactness of the thermodynamic model. Optimization works have been performed to reduce the utility consumptions using solvent circulation rate, column operating pressure and feed stage location as manipulated variables.