• Journal of Venture Innovation
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• v.5 no.2
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• pp.85-99
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• 2022

Dryers becoming commercially available for experimental and industrial use are classified to general drying oven, hot-air dryer, vacuum dryer, freezing dryer, etc. and kinds of them are various from the function, size and volume, etc. But the moisture measurement is not applied although it is important factor for the quality control and the performance improvement of products, and then now is very passive because the weight is weighed arbitrarily after dry-end. Generally the method for measuring moisture is divided by a direct measurement method and a indirect measurement method, and the former such as the change of weight or volume on the front and rear of separation of moisture, etc. is mainly used. Relatively a indirect measurement is very limited to apply due to utilize measurement apparatuses using temperature conductivity and micro-wave etc. In this research, we easily designed the moisture measurement system using the open-source based Arduino, and monitored moisture fluctuations and weight profiles in the real-time without the effect of external environment. Concretely the temperature-humidity and load cell sensors were packaged into a drying oven and the various change values were measured, and their sensors capable to operate 60℃ and 80℃ were selected to suitable for the moisture sensitive materials and the food dry. And also the performance safety using the organic samples of banana, pear, sawdust could be secured because the changes of evaporation rate as the dry time and temperature, and the measurement values of load cell appeared stable response characteristics through repeated experiments. Hereafter we judge that the reliability can be improved increasingly through the expansion of temperature-humidity range and the comparative analysis with CFD(Computational Fluid Dynamics) program.

• Journal of the Korean Ceramic Society
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• v.41 no.12 s.271
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• pp.873-879
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• 2004

In all major industries ranging from powder industries and advanced ceramics, to the food and pharmaceutical manufacture powder industries, the main production process is the spray dryers. In this paper, a systematic approach is used and six rules are obtained for the basis of the fuzzy model. A fuzzy model is based on the past behavior of the target system and expected to be able to reproduce the behavior of the target system. The output of the developed fuzzy model shows, graphically and statistically, a high level of face validity. Therefore, it is concluded that the developed fuzzy model mimics the actual process and can be considered, with confidence, as a reliable model to study, analyze, and improve the existing process.

• Proceedings of the KIEE Conference
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• 2008.05a
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• pp.171-172
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• 2008

원적외선 세라믹 건조기를 개발하기 위하여 탄화규소가 주원료로한 세라믹 발열판을 제작하여 건조기 내부에 설치하여 실험하였다. 발열판 장착위치에 따른 실험결과 위치는 큰 변수가 되지 않았고, 기존 5[kW]용량의 씨즈 히터를 2[kW]의 세라믹 발열판으로 대체하면서 에너지절약형 원적피선 세라믹 건조기를 제작할 수 있었다. 또한 발열판 자제 온도 분포를 측정한 결과 시간이 흐름에 따라 온도 분포는 약진의 차이가 있기는 하지만 대체적으로 근일한 분포를 나타내었다. 사용에 따른 경년변화를 측정하기 위해 90시간 동안 부하를 걸어 실험하였지만 발열판 자체의 저항이나 소비 전력의 변화는 나타나지 않았다.

• Journal of the Korean Ceramic Society
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• v.41 no.5
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• pp.353-358
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• 2004

Spray drying is a unique drying process for powder production. Spray dried product must be free-flowing in order to fill the pressing dies rapidly, especially in the ceramic production. The important powder characteristics are; the particle size distribu-tion and moisture content of the finished product that can be estimated and adjusted by the spray dryer operation, within limits, through regulation of atomizer and drying conditions. In order to estimate the moisture content of the resultant dried product, we modeled the control system of the drying process using two different Artificial Neural Network (ANN) approaches, namely the Back-Propagation Multiplayer Perceptron (BPMLP) algorithm and the Radial Basis Function (RBF) network. It was found out that the performance of both of the artificial neural network models were quite significant and the total testing error for the 100 data was 0.8 and 0.7 for the BPMLP algorithm and the RBF network respectively.

• Proceedings of the KAIS Fall Conference
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• 2005.05a
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• pp.321-323
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• 2005

중수숭급기 충진재의 부식원인인 염분 유입 및 열분해로 인한 산화물 형성 과정 조사를 위해 zeolite 의 열분해 및 염분 유입을 조사하였다. 그리고 원자력 발소의 dryer 모사 장치를 만들어 열분해 특성 조사 실험을 하였다. zeolite 열분해 특성 조사 결과 zeolite에 고온의 증기를 통과시키면 가수분해가 일어나 구조가 바뀌게 되며, $500\~700^{\circ}C$에서 완전히 열분해 된다. 그리고 열분해가 일어난 zeolite에 염분이 유입되면, zeolite의 $H^+$와 염분의 $Na^+$ 가 자리바꿈을 하게 되고, 수중에 $H^+$ 와 $Cl^-$ 가 존재하여 HCl이 형성될 것으로 조사되었고, 실험 결과 pH가 4.5, 4.53, 4.72, 4.64, 4.86, 5.03, 4.61로 낮게 측정되었다.

• Korean Journal of Materials Research
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• v.28 no.11
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• pp.627-632
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• 2018

Two dimensional(2D) crystals, composed of a single layer or a few atomic layers extracted from layered materials are attracting researchers' interest due to promising applications in the nanoelectromechanical systems. Worldwide researchers are preparing devices with suspended 2D materials to study their physical and electrical properties. However, during the fabrication process of 2D flakes on a target substrate, contamination occurs, which makes the measurement data less reliable. We propose a dry transfer method using poly-methyl methacrylate(PMMA) for the 2D flakes to transfer onto the targeted substrate. The PMMA is then removed from the device by an N-Methyl-2-pyrrolidone solution and a critical point dryer, which makes the suspended 2D flakes residue free. Our method provides a clean, reliable and controllable way of fabricating micrometer-sized suspended 2D nanosheets.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.6
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• pp.37-45
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• 2018

An electric vehicle is an environmentally friendly vehicle because there is no exhaust gas, unlike gasoline automobiles. On the other hand, because the electric vehicle is driven by electric power charged in batteries, the distance to go through a single charge depends on the energy density of the batteries. Therefore, a lithium-ion battery with a high energy density is a good candidate for batteries in electric vehicles. Because the electrode is an essential component that governs the efficiency of a lithium-ion battery, the electrode manufacturing process plays a vital role in the entire production process of lithium-ion batteries. In particular, the drying process during the electrode manufacturing process is a critical process that has a significant influence on the performance. This paper proposes an innovative process for improving the efficiency and productivity of the drying process in electrode manufacturing and describe the equipment design method and development results. In particular, the design procedure and development method for enhancing the electrode adhesion power, atmospheric pressure superheated steam drying technology, and drying furnace slimming technologies are presented. As a result, high-speed drying technology was developed for battery electrodes through the world's first turbo dryer technology for mass production using open/integrated atmospheric pressure superheated steam. Compared to the conventional drying process, the drying furnace improved the productivity (Dry Lead Time $0.7min{\rightarrow}0.5min$).

• Membrane Journal
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• v.20 no.4
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• pp.267-277
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• 2010

Gas separation membranes have been developed for decades in various areas to replace the conventional processes. Membrane processes for gas separation have many advantages of energy saving, compact size, and easy scale-up. Nowadays, gas separation processes is widely spreaded in nitrogen generating system, hydrogen generating system, membrane dryer, on board inert gas generating system, natural gas purification, biogas purification and fuel cells. Carbon dioxide separation process using membrane would be a strong candidate of carbon dioxide capturing process. In order to broaden the scope of application of gas separation membranes, development of new materials which can overcome the borderline of Robeson's plot should be necessary, so that many researchers and companies are trying to develop the new materials like polymers containing cardo and spiro group and PIMs (polymers for intrinsic microporosity).

• Journal of Biosystems Engineering
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• v.37 no.6
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• pp.385-397
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• 2012

Purpose: Drying characteristics of sawdust was studied under batch mode using lab scale microwave dryer. The objective of this study was to investigate the effect of material load and microwave output power on drying characteristics of sawdust. Methods: Material load and microwave output power were varied from 23 to 186 g and 530 to 370 W respectively. Different kinetic models were tested to fit the drying rates of sawdust. Similarly, the activation energy was calculated by employing the Arrhenius equation. Results: The drying efficiency increased considerably, whereas the specific energy consumption significantly decreased with increase in material load and microwave output power. The cumulative energy efficiency increased by 9%, and the specific energy consumption decreased by 8% when the material load was increased from 23 to 186 g. The effective diffusivity increased with decrease in material load and increase in microwave output power. The previously published model gave the best fit for data points with $R^2$ and RMSE values of 0.999 and 0.01, respectively. Conclusions: The data obtained from this study could be used as a basis for modeling of large scale industrial microwave dryers for the pellet production.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.39 no.3
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• pp.52-59
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• 2007

This paper confirms that high solid coating can increase coating speed and reduce drying cost. Low solid coating color with the synthetic thickener and high solid coating color with the rheology modifier and with higher ratio of GCC were prepared. Coated paper was then produced with an industrial coater, varying coating speed and dryer temperature in order to keep the moisture content of the coated paper constant. Coating color concentration was able to be increased from 66% to 69% and from 68% to 71% without an adverse effect on coating color rheology. With a help of the rheology modifier, the increased ratio of GCC in high solid coating did not show harmful effects on the coated paper quality.