• 전기학회논문지
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• 제59권9호
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• pp.1663-1672
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• 2010

The boiler feed-water pump controllers which can be applied to 500MW class coal fired power plants was developed. The validity of the developed controllers was shown via the applied test result in a power plant. It is expected that the developed controllers are used to retrofit the existing controllers that have surpassed their expected service life and have limited spare parts, and contributes to the stable operation of plants. Based on the collected data and analysis, new control schemes were developed and implemented during the overhaul period in the new control systems. During normal operation, feed water could be supplied to the boiler with the capability of the 1600t/h flow without any problems in automatic mode of controllers. In this study, the feed-water pump controllers were developed successfully. In addition, it is expected that the developed controllers can make the plant operation more stable and can be applied to a lot of power plants.

• 한국연소학회지
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• 제22권1호
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• pp.14-22
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• 2017

Co-firing of renewable fuel in coal fired boilers is an attractive option to mitigate $CO_2$ emissions, since it is a relatively low cost option for efficiently converting renewable fuel to electricity by adding biomass as partial substitute of coal. However, it would cause reducing plant efficiency and operational flexibility, and increasing operation and capital cost associated with handling and firing equipment of renewable fuels. The aim of this study is to investigate the effects of biomass co-firing on $CO_2$ emission and capital/operating cost. Wood pellet, PKS (palm kernel shell), EFB (empty fruit bunch) and sludge are considered as renewable fuels for co-firing with coal. Several approaches by the co-firing ratio are chosen from previous plant demonstrations and commercial co-firing operation, and they are evaluated and discussed for $CO_2$ reduction and cost estimation.

• 한국연소학회지
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• 제15권2호
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• pp.1-11
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• 2010

Power generation systems based on the oxy-coal combustion with carbon dioxide capture and storage (CCS) capability are being proposed and discussed lately. Although a large number of lab scale studies for oxy-coal power plant have been made, studies of pilot scale or commercial scale power plant are not enough. Only a few demonstration projects for oxy-coal power plant are publicized recently. The proposed systems are evolving and various alternatives are to be comparatively evaluated. This paper presents a proposed approach for performance evaluation of a commercial 100 MWe class power plant, which is currently being considered for 'retrofitting' for the demonstration of the concept. The system is configurated based on design and operating conditions with proper assumptions. System components to be included in the discussion are listed. Evaluation criteria in terms of performance are summarized based on the system heat and mass balance and simple performance parameters, such as the fuel to power efficiency and brief introduction of the second law analysis. Also, gas composition is identified for additional analysis to impurities in the system including the purity of oxygen and unwanted gaseous components of nitrogen, argon and oxygen in air separation unit and $CO_2$ processing unit.

• 청정기술
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• 제20권3호
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• pp.298-305
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• 2014

석탄에 포함되어 있는 회분은 환경오염을 유발시킬 수 있으며, 고온에서 운전되는 발전 설비에 융착되어 열전달 효율을 저하시키는 문제점을 가지고 있다. 이러한 문제를 해결하기 위해서 알칼리나 산, 또는 유기 용매를 이용하여 석탄 내의 회분을 제거하기 위한 연구와 함께 무회분 석탄을 이용한 석탄화력 발전 및 석탄가스화 복합발전에 대한 타당성 연구가 활발히 진행 중이다. 따라서 본 연구에서는 200 ppm급 무회분 석탄을 석탄가스화 발전에 이용하기 위해서 필요한 가스화기 운전조건을 ASPEN $Plus^{(R)}$ 공정모사의 민감도 해석을 바탕으로 도출하였다. 특히 석탄가스화 공정은 열분해, 휘발분 연소, 촤 가스화 공정으로 나누어 해석을 진행하였으며, 1.5 톤일급 비용융(non-slagging) 가스화기의 크기 및 운전 조건을 반영하여 모델링 하였다.

• 에너지공학
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• 제8권2호
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• pp.317-324
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• 1999

This study suggests the effectiveness of an "extended" power system evaluation methodology based on LCA and energy input-output analysis techniques. This "extended" evaluation methodology is designed to incorporate total energy system costs through fuel cycle and external costs, including CO$_2$abatement cost. As an empirical test, we applied the methodology to orimulsion-fired power generation technology and found that orimulsion could be considered as in attractive base-load power generation fuel in terms of economic and environmental aspects, compared to conventional coal-fired power plant.

• 한국연소학회지
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• 제17권3호
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• pp.30-45
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• 2012

An existing unit of power plant is considered to refurbish it for possible application of carbon capture and storage(CCS). Conceptual design of the plant includes basic considerations on the national and international situation of energy use, environmental concerns, required budget, and time schedule as well as the engineering concept of the plant. While major equipment of the recently upgraded power plant is going to be reused, a new boiler for air-oxy fired dual mode operation is to be designed. Cryogenic air separation unit is considered for optimized capacity, and combustion system accommodates flue gas recirculation with multiple cleaning and humidity removal units. The flue gas is purified for carbon dioxide separation and treatment. This paper presents the background of the project, participants, and industrial background. Proposed concept of the plant operation is discussed for the possible considerations on the engineering designs.

• 플랜트 저널
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• 제13권1호
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• pp.44-50
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• 2017

500 MW급 석탄화력발전소를 대상으로 연료분석법 및 연속측정법을 사용하여 이산화탄소 배출량을 산정하고 특성을 알아보았다. 연료분석법은 산정방법 중 배출량이 가장 낮게 산정되는 것을 확인하였다. 이는 순발열량이 낮게 분석되기 때문으로 저열량탄을 사용하는 경우 연료분석법을 활용하는 것이 유리하다. 또한 입하탄 보다 소비탄을 시료로 사용하였을 때 배출량이 낮게 산정되는 특성을 보인다. 하지만 차이는 2% 미만으로 미미하여, 분석 인력 및 장비가 한정된 현 여건에서는 입하탄을 연료분석에 사용하여도 적정하다고 판단된다. 연속측정법은 연료분석법 대비 배출량이 다소 높게 산정되지만 국내외 제시된 배출계수를 사용한 산정량보다 낮게 산정된다. 따라서 석탄 탄종 변화로 연료분석법에 의한 산정량이 증가할 경우, 유량 측정방법을 보완하여 사용한다면 배출량 산정 시 유리할 것이다.

• 플랜트 저널
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• 제17권2호
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• pp.32-41
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• 2021

최근 미세먼지 등 대기환경 문제가 국가적 이슈로 급부상 하고있는 추세이며 특히 석탄화력발전소에 대한 강도높은 환경규제치가 적용되고 있는 실정이다. 본 연구는 석탄화력발전소 주요 대기오염 배출물질인 황산화물과 먼지 제거를 위한 탈황설비 성능개선 사례에 대해 소개하고 있으며 현재 운영중인 1,000 MW 발전소의 성능개선을 위한 네가지 Case Study를 수행하고 공사를 하였다. 탈황설비 흡수탑 개조를 통해 액기비를 증대시켰으며 산화공기 유량을 증대시켜 기액 반응을 촉진하였다. 또한 가스가스히터 누설률을 개선하여 최종 탈황설비 효율을 향상시켰다. 기존 설비와 조화를 고려한 성능개선 공사를 통해 2023년부터 적용될 규제치(황산화물 25ppm, 먼지 5mg/Sm³)를 만족할 것으로 예상되며 타 화력발전소에 검토 및 적용하는데 참고될 수 있다고 기대된다.

• 한국결정성장학회지
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• 제23권4호
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• pp.201-206
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• 2013

화력발전소에서 배출되는 석탄 바닥재 및 잔사회는 재활용이 힘든 폐자원이어서 주로 매립 처분되고 있다. 본 연구에서는 국내 화력발전소에서 배출된 석탄 잔사회, 바닥재 그리고 준설토를 혼합하여 인공골재를 제조하고, 실험인자가 골재의 발포거동 및 물성에 미치는 영향을 분석하였다. 특히 미연탄소가 많이 포함되어 있는 잔사회에 대하여 하소 처리를 한 뒤, 인위적으로 활성탄소를 첨가함으로서 하소유무 및 활성탄소 첨가량이 인공골재의 발포특성에 미치는 영향을 조사하였다. 이를 위해 인공골재의 부피비중 및 흡수율 값을 시편의 미세구조 관찰 결과와 연계하여 고찰함으로서, 잔사회의 재활용율 제고에 일조하고자 하였다.

• 한국연소학회지
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• 제19권3호
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• pp.8-17
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• 2014

The aims of this research were to evaluate effects of biomass co-firing to pulverized coal power plants and the variation of co-firing ratios on the plant efficiency related to power consumption of auxiliary system and flue gas characteristics such as production and component by process simulation based on the existing pulverized coal power plant. In this study, four kinds of biomass are selected as renewable fuel candidates for co-firing: wood pellet(WP), palm kernel shell(PKS), empty fruit bunch(EFB) and walnut shell(WS). Process simulation for various biomass fuels and co-firing ratios was performed using a commercial software. Gas side including combustion system and flue gas treatment system was considering with combination of water and steam side which contains turbines, condenser, feed water heaters and pumps. As a result, walnut shell might be the most suitable as co-firing fuel among four biomass since when 10% of walnut shell was co-fired with 90% of coal on thermal basis, flue gas production and power consumption of auxiliary systems were the smallest than those of other biomass co-firing while net plant efficiency was relatively higher than those of other biomass co-firing. However, with increasing walnut shell co-firing ratios, boiler efficiency and net plant efficiency were expected to decrease rather than coal combustion without biomass co-firing.