• Title/Summary/Keyword: 화학적 공법

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Recent Trends and Prospects of Chemical Enhanced Oil Recovery (석유회수증진을 위한 화학적 공법 연구 동향 및 전망)

  • Choi, Youngil;Kang, Pan-Sang;Lim, Jong-Se
    • Journal of the Korean Society of Mineral and Energy Resources Engineers
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    • v.55 no.6
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    • pp.660-669
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    • 2018
  • Enhanced oil recovery (EOR) is a method used to improve the recovery factor of remaining hydrocarbon in reservoir. Polymer and surfactant EOR techniques have limitations depending on reservoir or production conditions (temperature, salinity, etc.) because the polymer and surfactant are highly affected by the reservoir conditions. In this study, analysis of the current improvements to chemical substances and application technologies was performed based on recent research data. Conventional polymer is readily degraded by the conditions of high temperature and high salinity. Therefore, new polymers and injection techniques have been developed to remediate such problems. In addition, surfactant applicable to shale and carbonate reservoirs is developed as petroleum recovery expands to unconventional reservoirs. However, these chemical substances are not widely used in the current oil fields due to high costs. Therefore, further studies must be conducted to reduce the cost and thus increase the effectiveness of EOR techniques.

PEO공법을 적용한 마그네슘 합금의 공정 변수에 따른 산화 피막의 특성

  • Nam, Seok-Hyeon;Lee, Jae-Eun;Na, Il-Chae;Kim, Yong-Gyun
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2016.11a
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    • pp.125.1-125.1
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    • 2016
  • 마그네슘 합금은 소재 특성상 표면처리가 필수불가결하다. 금속의 다양한 표면처리 방법 중 마그네슘 합금은 크게 화학적 반응을 이용해 산화막을 생성해 피막을 올리는 화성처리법과, 전해액 내에 침지시켜 전기를 걸어주어 금속 표면에 플라즈마 아크를 통해 산화막을 생성하는 PEO공법 두 가지 방법이 있다. 본 연구에서는 마그네슘 합금 소재에 PEO공법을 적용한 산화피막의 공정 변수에 따른 특성을 SEM, EDS, SST, potentiodynamic polarization 등으로 분석하였다.

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Management and Remediation Technologies of Contaminated Sediment (오염퇴적물 관리방향 및 처리공법)

  • Kim, Geon-Ha;Jeong, Woo-Hyeok
    • Journal of Soil and Groundwater Environment
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    • v.12 no.3
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    • pp.1-9
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    • 2007
  • As Total Maximum Daily Load program is being implemented, needs for the management and treatment of contaminated sediment are rising to attain cleaner water resources. In this paper, impacts and management methods of contaminated sediment were reviewed. Remediation technologies for contaminated sediment including dredging, natural attenuation, in situ solidification/stabilization, in situ biological remediation, in situ chemical remediation and capping were reviewed. Integrated remediation scheme was presented as well.

오키나와현의 토양유실 현황과 저감대책

  • 정상옥
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.41 no.6
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    • pp.6-12
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    • 1999
  • 오키나와 지방의 심각한 문제가 되고 있는 토양유실에 대하여 알아보았다. 먼저 오키나와의 자연적 사회적 현황을 소개하였으며, 이어서 오키나와 지방의 토양유출 현황과 토양유출 저감방법에 대하여 소개하였다. 농지에서의 토양유실 저감기법으로는 물리적, 화학적, 영농관리실행 등으로 구분할 수 있으며, 개발현장에서의 토양유출 저감공법으로는 표토보호공, 유출억제공, 탁수처리공, 확산처리공으로 구분할 수 있다. 오키나와 지방에서는 농지와 개발사업지역에서 토양유출을 방지하기 위하여 최선의 노력을 경주하고 있다. 우리 나라에서도 토양보전을 위하여 노력하여야 할 것이며 특히 토양유실이 심각한 북한의 토양보전공법에 대하여 많은 관심과 투자가 필요할 것으로 사료된다.

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RC조 보수에 사용되는 폴리머시멘트 몰탈의 철근 부착특성 평가

  • Park, Dong-Cheon
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2013.10a
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    • pp.247-249
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    • 2013
  • 열화한 철근콘크리트 구조물에 대하여 성능회복을 위하여 전기화학적 방식, 단면복구공법, 균열보수공법, 표면마감공법 등이 상용되고 있다. 본 연구에서는 단면복구공법의 적용과 성능예측을 위한 해석 모델의 입력값으로 사용될 보강철근과 단면복구재의 부착특성을 평가하기 위하여 철근인발실험을 실시하였다. 폴리머시멘트몰탈이 사용되었으며 부착요소의 강성과 강도를 구하여 비선형 해석을 실시하여 상당한 정확도의 예측값을 도출하였다.

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전남 이양-능주간 국도변 비탈면녹화 설계 및 시공 잠정지침 적용 사례연구

  • Park, Bong-Ju;No, Jae-Hyeon
    • Proceedings of the Korean Environmental Sciences Society Conference
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    • 2008.11a
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    • pp.551-553
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    • 2008
  • 식생피복율, 병충해, 출현종수 등의 항목으로 평가를 실시하였다. 리핑암과 발파암에서는 녹화공법 C와 녹화공법 C-1이 가장 높은 식생피복율을 보였다. 절토부의 경우에는 녹화공법 D의 식생피복율 녹화공법 E보다 상대적으로 높은 것으로 나타났으며, 성토부의 경우에는 녹화공법 D가 녹화공법 F보다 높은 것으로 나타났다. 목본종의 출현종수는 암지역(리핑암, 발파암), 토사지역(절토부, 성토부)에 적용한 모든 녹화공법에서 상급으로 평가되었으나, 전체종의 출현종수의 비율에 있어서는 다소의 차이가 나타났다. 식생기반의 물리화학적 특성 분석에서 토사지역 절토부의 녹화공법 E와 성토부의 녹화 공법 D의 경우는 토양경도가 다른 공법들에 비해 낮게 나타났다. 암지역의 리핑암과 발파암에 사용된 모든 공법은 토양산도와 토양경도가 식물의 근계생육에 영향을 미치지 않는 범위 이내로 조사되었다. 리핑암과 발파암에 적용된 각 공법의 경우 식생상태가 양호하였으며, 향후 주변 지역의 자연식생의 침입과 천이과정을 거치면서 식생상태가 역시 정상적으로 변화될 것으로 예상된다. 토사지역의 절토부와 성토부에서는 중간 정도의 식생상태를 유지하고 있었으나, 향후 주변의 산림지역으로부터의 식생 구성종의 침투로 인해 식생천이가 역동적으로 변화될 것으로 예상된다.

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Corrosion Protection of Steel by Applying a Zn-Sn Metal Spray System (Zn-Sn 합금을 이용한 강구조물의 금속용사공법 방식성능평가 연구)

  • Ryu, Hwa-Sung;Jeong, Dong-Geun;Lee, Han-Seung
    • Journal of the Korea Institute of Building Construction
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    • v.14 no.6
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    • pp.505-513
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    • 2014
  • The purpose of this study is to evaluate the corrosion protective properties of a Zn-Sn metal spray method according to the contents of Zn and Sn by a CASS test and the electrochemical theory. In the experiment, the CASS test and the electrochemical test were conducted to investigate the corrosion protective property of the Zn-Sn Metal Spray system, the Zinc galvanizing system, and the heavy duty coating system. As a result, it was confirmed that the Zn-Sn (65:35) Metal Spray system had very high corrosion protective property through the electrochemical characteristic as comparison with the other anti-corrosion systems and was very effective to prevent steel products from corrosion.

Studies on the Desertification Combating and Sand Industry Development(IV) - Technology Development for Sanddune Fixation and Sandy Land Conservation in China - (사막화방지(沙漠化防止) 및 방사기술개발(防沙技術開發)에 관한 연구(硏究)(IV) - 중국(中國)의 사구고정(沙丘固定) 및 방사공법분석(防沙工法分析) -)

  • Woo, Bo-Myeong;Lee, Kyung-Joon;Choi, Hyung-Tae;Lee, Sang-Ho;Park, Joo-Won;Wang, Lixian;Zhang, Kebin;Sun, Baoping
    • Journal of Korean Society of Forest Science
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    • v.90 no.3
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    • pp.277-294
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    • 2001
  • This study is aimed to analyze and to evaluate the technology development for sanddune fixation and sandy land conservation in China, resulting from the project of "Studies on the desertification combating and sand industry development". There are various types of sanddunes, including shrub-bunch type, dendritic, honey combed lattice, crescentic, parabolic, pyramid, complex and irregular types, domed, and so on. The height distribution ratios of these sanddunes are 13% of less than 5m, 17% of 6~10m, 18% of 11~25m, 14% of 26~50m, 28% of 51~100m, 10% of more than 100m, and so on. In dry land of China, shifting direction of the sanddune is mainly varying with main direction of wind, but types of shifting sanddunes have many differences in accordance with region, topography, size and shape of sanddunes. The main sanddune fixation technologies could be divided into the bio-ecological measures, physical measures and chemical measures. The bio-ecological measures include such vegetation measures as shrub-grasses measures, sandbreaks between sand dunes, sand fixation shelterblets and establishment of farmland shelterbelts, etc. The physical measures include establishment of high-sanddune stabilization walls and low-sanddune stabilization walls, sanddune fixation levees and coverage method with sediment clay, etc. The chemical measures include fixation-materials spraying and synthetical liquid spraying methods, etc. Besides, irrigation and sand settlement measures, shifting sand trapping channel, ditchsand fixation measures, etc. have been effectively applied.

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A Study on Applicability of Mercury-contaminated Tailing and Soil Remediation around abandoned Mines using Washing Process (세척공법을 이용한 광산주변 수은 함유 오염물질 처리 적용성 평가)

  • Kwon, Yo Seb;Park, So Young;Koh, Il Ha;Ji, Won Hyun;Lee, Jin Soo;Ko, Ju In
    • Economic and Environmental Geology
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    • v.53 no.4
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    • pp.337-346
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    • 2020
  • This study was carried out to evaluate the applicability of the soil washing process to remediation mercury-contaminated mine tailing or solid material (soil and sediments etc.) around abandoned mines. First, the physicochemical characteristics of mine tailing were analyzed through particle size analysis and sequential extraction. Secondly, laboratory scale washing experiments were performed using hydrochloric acid, nitric acid, potassium iodide and sodium thiosulfate. As a results of particle size analysis, mine tailing particle were concentrated below 40 mesh and the particle size below 200 mesh was the most analyzed. As a result of sequential extraction, elemental mercury fraction was analyzed as the highest with 69.12%, with strongly bound fraction 15.25% and residual and HgS fractions 11.97%, respectively. Laboratory scale washing experiments showed low applicability for nitric acid and sodium thiosulfate solutions. In case of hydrochloric acid solution, it was analyzed that mercury removal was possible at particle size of 200 mesh or more. Therefore, it is considered to be performed together with the physical sorting process. Potassium iodide solution was analyzed to have high washing efficiency at all concentrations and particle sizes. In particular, the mercury removal efficiency is high in the micro particles, and thus the applicability of the washing technology is the highest.

Performance Evaluation of Various Concrete Repair Materials to Corrosion Prevent of Rebar (철근의 부식 방지를 위한 다양한 콘크리트 보수재료들의 성능평가)

  • Tae-Kyun Kim;Jong-Sub Park
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.11 no.4
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    • pp.458-466
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    • 2023
  • Structures in our surroundings deteriorate over time due to environmental and chemical factors, resulting in a decrease in their performance. The primary causes of degradation in concrete structures are carbonation, salt damage, and freeze-thaw cycles. Various maintenance methods exist to address these degradation issues. However, research and technological development for existing maintenance methods have been ongoing, but the accuracy and effectiveness of repair materials and techniques have not been extensively validated. Therefore, in this study, we conducted a material performance evaluation of various manufacturers' repair materials. Based on this evaluation, we applied corrosion inhibitors and epoxy, which are the methods most closely related to crack repair, to assess the durability performance against carbonation, salt damage, and freeze-thaw cycles. The results show approximately a two-fold performance improvement against carbonation and salt damage, and a 5% enhancement in repair performance against freeze-thaw cycles. Thus, it is considered effective in preventing rebar corrosion when appropriate maintenance is carried out according to environmental and chemical factors during structural repairs.