• Title/Summary/Keyword: mine feasibility study

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Evaluation of Field Feasibility and Efficiency of Hydraulic Ram Pump (수격펌프의 효율성 및 현장 적용성 평가)

  • Lee, Soo-Hyoung;Yoon, Heesung;Kim, Dong-Hun;Shin, Esther;Kim, YongCheol;Ko, Kyung-Seok;Ha, Kyoochul
    • Economic and Environmental Geology
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    • v.49 no.3
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    • pp.243-248
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    • 2016
  • This study was conducted to evaluate the applicability and efficiency of water supply using hydraulic ram pump. Study area is the Imgok-ri, Hwanam-myeon, Sanju-si, Kyeongsangbuk-do. There is an abandoned coal mine, where groundwater is discharged from its entrance with a flow rate of approximately $260m^3/day$. Hydraulic ram pump uses the waterhammer phenomenon and utilizes the power of falling water for pumping part of that water to a higher elevation than the water sources without electric power. To determine the efficiency of hydraulic ram pump, the flow rate was measured at three points according to the altitude difference (${\Delta}h=19m$ (point 1), 30 m (point 2), 40 m (point 3)). Flow rate measured at 1, 2, and 3 were about $8.6{\sim}10.8m^3/day$, $3.98{\sim}4.39m^3/day$, and $2.35{\sim}2.59m^3/day$, respectively. The current results suggested that, hydraulic ram pump could be applicable for the water supply system in mountain areas without external power supply.

Estimating the Investment Value of Fuel Cell Power Plant Under Dual Price Uncertainties Based on Real Options Methodology (이중 가격 불확실성하에서 실물옵션 모형기반 연료전지 발전소 경제적 가치 분석)

  • Sunho Kim;Wooyoung Jeon
    • Environmental and Resource Economics Review
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    • v.31 no.4
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    • pp.645-668
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    • 2022
  • Hydrogen energy is emerging as an important means of carbon neutrality in the various sectors including power, transportation, storage, and industrial processes. Fuel cell power plants are the fastest spreading in the hydrogen ecosystem and are one of the key power sources among means of implementing carbon neutrality in 2050. However, high volatility in system marginal price (SMP) and renewable energy certificate (REC) prices, which affect the profits of fuel cell power plants, delay the investment timing and deployment. This study applied the real option methodology to analyze how the dual uncertainties in both SMP and REC prices affect the investment trigger price level in the irreversible investment decision of fuel cell power plants. The analysis is summarized into the following three. First, under the current Renewable Portfolio Standard (RPS), dual price uncertainties passed on to plant owners has significantly increased the investment trigger price relative to one under the deterministic price case. Second, reducing the volatility of REC price by half of the current level caused a significant drop in investment trigger prices and its investment trigger price is similar to one caused by offering one additional REC multiplier. Third, investment trigger price based on gray hydrogen and green hydrogen were analyzed along with the existing byproduct hydrogen-based fuel cells, and in the case of gray hydrogen, economic feasibility were narrowed significantly with green hydrogen when carbon costs were applied. The results of this study suggest that the current RPS system works as an obstacle to the deployment of fuel cell power plants, and policy that provides more stable revenue to plants is needed to build a more cost-effective and stable hydrogen ecosystem.

Application of Laser Distance Measurer to measure ground surface displacement in slopes (사면의 지표변위 측정을 위한 레이저 거리측정기의 활용)

  • Cho, Yong-Chan;Song, Young-Suk
    • Journal of the Korean Geosynthetics Society
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    • v.13 no.1
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    • pp.23-31
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    • 2014
  • In this study, the method to measure effectively the ground surface displacement of slope was proposed using the Laser Distance Measurer (LDM). Applying the proposed technique is more simple and easier than the complicated and high-priced instrument to measure the ground surface displacement. LDM is an instrument that the red laser aimed at the target and then the reflected laser used for calculating the distance. The advantages of LDM are easy operating method, high measurement precision and lower in price. To check the feasibility, the proposed method applied to the real site that the ground surface displacement of slope was occurred continuously. The ground surface displacements were occurred in various points of the natural and cut slopes located at the lower part of coal mine waste heap due to the load of waste heap. To measure directly the ground surface displacement in this site, 6 measurement sections and 26 measurement points were selected. As the result of the displacement measured by the proposed technique within a certain period time, the accumulative ground surface displacement could be measured as well as the velocity of displacement could be estimated. Also, the progress direction of ground surface displacement can be confirmed and predicted through the analysis of all measured result.

Transfer of Arsenic and Mercury from Stabilized Farmland Soil to Lettuce using Calcium Sulfate Fertilizer with Different Physical Properties as a Stabilizing Agent (안정화제로 사용된 황산칼슘비료의 물리적 형태에 따른 토양 비소 및 수은의 안정화와 식물체 전이특성)

  • Il-Ha Koh;Yo Seb Kwon;Min-Hyeon Lee;Jung-Eun Kim;So-Young Park;Ju In Ko;Won Hyun Ji
    • Economic and Environmental Geology
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    • v.56 no.5
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    • pp.619-628
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    • 2023
  • In this study, we investigated the feasibility of calcium sulfate fertilizer as a stabilizing agent for As and Hg contaminated farmland soil and its stabilization characteristics in 3 different physical forms (particulate, powder, and solution) through a pot experiment including 34 days of lettuce growth. As and Hg contents of the lettuce grown in the stabilized soils were decreased by at least 70%. However the lettuce yield of the soil stabilized with the solution agent was decreased by 46% due to the overabundance of the nutrients from the solution agent. Thus, if a solution-type agent is planned for agricultural farmland soil stabilization, additional tests for optimal dosage are needed to preserve vegetation growth. In Hg fractionation, a lower concentration of elemental fractions and a higher concentration of residual/sulfide fractions were identified in the soils stabilized with the solution, powder, and pariculate agents in descending order while there were no significant changes in As fractionation. Overall results suggest that calcium sulfate fertilizer can be used as a stabilizing agent, and a solution-type agent could be used when the operation of heavy machinery for the soil stabilization process is impossible.