• Proceedings of the KSME Conference
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• 2000.04b
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• pp.264-269
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• 2000

As a part of the ongoing effort towards commercial application of high-temperature fuel cell power generation systems, we have recently built a pilot-scale molten carbonate fuel cell power plant and tested it. The stack test system is composed of diverse peripheral units such as reformer, pre-heater, water purifier, electrical loader, gas supplier, and recycling systems. The stack itself was made of 40cells of $6000cm^2$ area each. The stack showed an output higher than 25kW power and a reliable performance at atmospheric operation. A pressurized performance was also tested, and it turned out the cell performance increased though a few cells have shown a symptom of gas crossover. The pressurized operation characteristics could be analyzed with numerical computation results of a stack model.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2004.05a
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• pp.128-132
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• 2004

알루미늄 폐드로스 내에 잔류하는 금속 알루미늄을 수산화나트륨용액으로 침출, 분리시켜서 수산화알루미늄으로 제조하는 과정에서 침출잔사가 발생된다. 본 연구에서는 이 침출잔사를 세척, 건조, 배소하여 알루미나질 캐스타블 내화물과 같은 세라믹 원료로 재활용하는 연구를 수행하였으며, 상용화를 위하여 파일롯트 플랜트 시험을 수행하였다. 시험 생산라인은 년간 1,000톤의 폐드로스를 처리하여 약 700톤의 세라믹 원료를 생산할 수 있는 규모이다. 생산라인의 시운전 결과 상용화를 위해서는 건조기의 개선이 필요하고, Na, Fe 등 불순 성분들이 시료에 유입되는 것을 줄여야 하는 문제점들을 파악할 수 있었으며, 개발한 기술의 상용화 적용 가능성을 확인할 수 있었다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2003.05a
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• pp.49.2-53
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• 2003

This paper reports the application of high strength concrete designed as 800kg/$cm^2$ on the columns and belt wall of Tower Palace III. The concrete should meet or exceed the requirements of slump of 23cm, ${\sigma}$18H of 100kg/$cm^2$, ${\sigma}$91th of 800kg/$cm^2$. The concrete mixings with 4 different domestic Silica fumes were investigated. Laboratory tests, the pilot productions of batcher plant and the full-scale mock up tests were performed As results of site application, all test results are satisfied with the requirements of columns and belt wall.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2001.05a
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• pp.187-191
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• 2001

In the paper, an approach to the development of the selective catalytic reduction process of NOx is presented. The reduction process can be efficiently controlled using a conventional combination of feed-forward and feed-back control structures. The aim of this paper is to test and verify an approach to the SCR process which is based on an industrial pilot plant of combustion and nitric oxide formation. The systems are based on measurements of a NOx removal ratio and the fuel flow rate, and NH$_3$slip which are usually available as a part of de-NOx control system.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2005.05a
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• pp.97-102
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• 2005

본 연구에서는 국내 재생 알루미늄업체에서 발생된 알루미늄 폐드로스를 수산화나트륨 용액으로 침출하여 폐드로스 중의 잔류 알루미늄을 용액 상으로 침출, 분리시키고, 침출용액 중에서 알루미늄 성분을 수산화알루미늄으로 회수하였으며 침출이 안 된 폐드로스 잔사는 수세, 건조, 배소 과정을 거쳐 알루미나질 내화물 원료로 재활용하는 연구를 수행하였다. 그리고, 1일 4톤의 알루미늄 폐드로스를 처리할 수 있는 규모의 파일롯트 플랜트를 건설, 시운전함으로써 연구결과의 상용화 가능성을 제시하였다.

• Journal of the Korea Organic Resources Recycling Association
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• v.14 no.4
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• pp.113-120
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• 2006

Wastewater generated through the food waste recycling process have known high concentration, BOD 20,000~150,000 mg/L, which has to treat to the proper level because of a ban on reclamation. But it is impossible to treat less than 10 days by existing water treatment plant. Ecodays Ltd. is to treat this wastewater during 2~4 days by ER-1, which can simultaneously induce the modified PFR(Plug Flow Reactor) of the oxygen transfer rate, MLVSS concentration, and influent concentration to top from bottom of reactor. We tested the pilot test about low concentration food wastewater(BOD 16,500 mg/L) and high concentration food wastewater(64,431 mg/L) at the food waste recycling plant of H-Gun(20t/d). Hydraulic retention time(HRT) of ER-1 for low concentration food wastewater is 2.5day. In low concentration conditions, ER-1 treatment efficiency is to appear BOD 99%, COD 98%, TN 97%, and TP 96%. While ER-1 process for high concentration food wastewater treatment is composed 2 stages, which are to be HRT 2.5day for law wastewater and HRT 1.5 day for secondary treatment. In high concentration conditions, ER-1 treatment efficiency is to appear BOD 97%, COD 84%, TN 66%, and TP 95%. It is treated without temperature control about high temperature($50^{\circ}C$) to appear low treatment efficiency in high concentration conditions.

• The KSFM Journal of Fluid Machinery
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• v.18 no.3
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• pp.60-65
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• 2015

This paper deals with performance characteristics and efficiencies of Pelton turbine can be applied as one of ERDs (Energy Recovery Devices) of PRO (Pressure Retarded Osmosis) system for desalination. The objective of this study is experimentally estimating the performance of micro-scale Pelton turbine for PRO pilot plant. Especially the performance characteristics with variations of jet nozzle diameter of Pelton turbine are discussed in detail. In order to do this, lab scale test rig of Pelton turbine was made for performance test, which includes water tank, Pelton wheel with buckets, jet nozzle and torque brake and so on. The parameter effects related on Pelton turbine's efficiency were investigated and discussed on the influence of the variations of load and speed ratio.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.4
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• pp.23-29
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• 2011

We try to build the base for implementation of smart water treatment plant through identifying status by data acquisition such as temperature, humidity, flow, level, pump status and CCTV by using USN terminal such as Zigbee, Wi-Fi, UHF at the center of the flowmeter calibration center in K-water institute. The data obtained from various sensors is transmitted to data processing device through different types of USN network, the processed data is implemented to monitor by smart phone and we try to perform low cost and high efficient USN-based pilot project by implementing remote monitoring system using network performance analysis and mobile devices.

• Journal of the Society of Disaster Information
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• v.9 no.2
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• pp.206-213
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• 2013

The paper presents the field applications and evaluation results of solid epoxy asphalt mixture for steel bridge deck. The material was developed in Japan. The material properties of epoxy asphalt mixture were evaluated through various literature review, and the mix design and mixture evaluation were conducted. According to the research results, the application of epoxy asphalt mixture for steel bridge deck was noticeable compare to the conventional ones. In addition, results from 3D finite element analysis showed that the performance of epoxy asphalt mixture for steel bridge deck was proved to be satisfied. As a result, a pilot test section was constructed using the epoxy asphalt mixture produced from conventional batch plant system. BPT test results showed that friction of the epoxy asphalt mixture was higher than the requirements compare to that of the conventional one.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.38 no.4
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• pp.547-553
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• 2018

An integrated iron and steel mill uses a large amount of water and produces wastewater which contains various contaminants such as iron, manganese, etc. Especially, in some regions of Southeast Asia, the concentration of silica in iron and steel mill wastewater is higher than in other countries. Silica is known to be one of the main causes for fouling in the membrane processes for water reuse. In cases of high concentrations of silica in iron and steel mill wastewater, the ferrous silicate tends to be formed. This could lead to higher fouling tendency depositing on the membrane surface. Therefore we conducted a pilot test to investigate the effect of silica and iron on the fouling tendency of reverse osmosis (RO) membrane for treating two types of wastewater from an integrated iron and steel mill. In this case of treated wastewater from iron and steel mill, RO pilot plant was operated with the fluxes 15.9LMH and 18.8LMH for 112 days to investigate the fouling characteristics. The results found that the fluctuation of flux was much wider than the average flux and the minimum permeability was low at 78%. In the case of treated runoff from an integrated iron and steel mill, the average concentration of iron was lower than in wastewater. RO pilot test was conducted with the flux 18.8LMH for 46 days. The results found that runoff had a lower fouling tendency and pre-treatment using microfiltration (MF) could minimize the fouling problem of RO.