• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1994년도 가을 학술발표회 논문집
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• pp.211-216
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• 1994

This study dealt with the properties for fly ash of conbined heat power plant and application for concrete industry. For this purpose, fly ash sampled Ulsan conbined heat power plant and analyzed for physical and chemical properties. As analyzed results of fly ash, contents of $SiO_ and Al_O_ $in the fly ash of Ulsan were less than those of Thermo-electric power plant(Boryuing), but contents of CaO were tem times as much as those of Boryung, because of these differences, it is expected that pozzolanic activity of concrete using fly ash of Ulsan will be different from another fly ash. Concrete specimens were tested to evaluate concrete preformance when 10 to 50 percent of the portland cement by weight in the concrete mix was replaced with fly ash of conbined heat power plant. As test results, workability and consideration in the fresh concrete were increased and concrete strength was showed more than 400kg/$\textrm{cm}^2$ for the required age. This study would be provided valuable data for the practical utilization of fly ash(conbined heat power plant). In the future, properties of fly ash concrete including long term strength, elapsed time, pozzolanic activity, modulus of elasticity, sulfate resistance, shrinkage, freeze-thaw durability and so on will be studied.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 추계 학술논문 발표대회
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• pp.101-102
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• 2015

Significant amount of bottom ash has been stored in the pond site of Hadong coal power plant located at southeast region of Korea. In order to address strong environmental regulation that is going to be enforced in the near future, it is necessary to consume waste bottom ash stored in the pond site in a sustainable manner. In this research, the chemical and mineral characteristics of various sized bottom ash samples from Hadong coal power plant were analyzed using XRF, XRD, and particle size analyzer. According to the experimental results, the chemical compositions of bottom ash was slightly changed in terms of Al and Fe content. As the size of the bottom ash increased, cristobalite was observed as a result of crystallization. The mineralogical composition and its size distribution of powder type bottom ash indicated that significant amount of fly ash is included together with small sized bottom ash.

• 유기물자원화
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• 제27권4호
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• pp.83-90
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• 2019

본 연구에서는 중유회의 고형연료로써 활용 가능성을 평가하기 위해 첨가제별 성형 특성과 조성을 분석하고, 제조한 SRF(Solid Refuse Fuel)의 발열량을 비교하였다. SRF 성형을 위해 함께 첨가한 첨가제는 귤박, 폐목재, 석탄이었으며, 함수율 30%를 기준으로 각각의 첨가제를 혼합하여 압출방법을 통해 펠렛 형태로 제조하였다. 실험결과, SRF의 성형성은 중유회와 석탄 또는 귤박을 혼합한 조건에서 우수하였으며, 발열량은 석탄을 혼합한 SRF가 4,274 kcal/kg 으로 가장 높았다. 따라서 중유회를 활용한 고형연료의 합성 조건은 20 wt%의 석탄을 혼합하여 함수율 30%로 제어하였을 때, 높은 성형성과 발열량의 향상을 나타내는 것을 확인하였다. 이 결과로부터 J 화력발전소의 중유회를 활용하여 첨가제(귤박, 폐목재, 석탄)를 일정 비율로 주입하였을 때 고형연료의 제조 가능성을 확인할 수 있었다.

• 에너지공학
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• 제27권3호
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• pp.57-62
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• 2018

The development of coal-fired power plants to ensure energy security and electricity consumption is a matter for the Vietnam economy. However, the huge amount of ash discharged is a major environmental challenge. It is estimated that by the end of 2017, the amount of ash in the country is about 40 million tons and annually emitted over 16.4 million tons. While the quantity of coal-fired power plant is rising, the ash content will increase year by year if the ash doesn't treat well. The ash will be increased from 61 million tons in 2018 to 109 million tons in 2020, 248 million tons in 2025 and 422 million tons in 2030. The difficulties of coal-fired power plants are the problem of ash handling, some plants are at risk of closure because there are not enough dump capacity to storage. Therefore, Vietnam is in need of urgent measures to treat a large amount of waste from coal-fired power plants. The specific objectives of this study were as follows: (1) provide an overview of coal ash situation produced by coal-fired power plants in Vietnam; (2) study about regulations related to coal ash treatment; (3) comprehend the literature review of the cement sector status.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 1996년도 춘계학술발표회 초록집
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• pp.88-96
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• 1996

The characteristic analysis of fly ash generated from a fired power plant using bunker-C oil has been investigated. Ash size distribution by an optical microscopy with image processing technique, morphological shape by a scanning electron microscope(SEM) and microscope, chemical composition by the inductively coupled plasma emission spectrometry(ICP), and resistivity measurement as a function of temperature and moisture content by the resistivity meter are performed. A study of physical, chemical and electrical characteristics of bunker-C fly ash plays an important role of improving the performance of an electrostatic precipitator and protecting air pollution. The samples of bunker-C fly ash for analysis were collected from the electrostatic precipitator hopper of Ulsan Power Plant Unit 1 and Pusan Power Plant Unit 1. Mass median diameter(MMD) of bunker-C fly ash was measured 12.7${\mu}{\textrm}{m}$, while MMD of fly ash generated from the mixture of bunker-C oil(40%) and domestic anthracitic coal(60%) was 25.7${\mu}{\textrm}{m}$. The morphological structure of bunker-C fly ash consisted of fine particles of non-spherical shape. The primary chemical components of bunker-C fly ash were composed of SiO2(2.36%), Al2O3(4.91%), Fe2O3(14.33%) and C(11.84%). Resistivity of bunker-C fly ash was found to be increased with increasing temperature at the range of 100~15$0^{\circ}C$ and was measured 103~104 ohm-cm.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1996년도 가을 학술발표회 논문집
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• pp.276-282
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• 1996

This study dealt with the properties for fly ash of combined heat power plant and application for concrete industry. For this purpose, fly ash of ulsan combined heat power plant was analyzed for physical and chemical properties and tested the properties of the super flowing concrete. As results of fly ash, contents of SiO2 and Al2O3 in the fly ash of Ulsan were less than those of thermal power plant(Boryung), but contents of CaO were ten times as much as those of Boryung. In order to satisfy the properties of the Super Flowing Concrete using class C fly ash, mixing conditions were determined the optimum water-binder(w/b), volume ratio of fine aggregates(Sr) and coarse aggregates(Gv).

• 플랜트 저널
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• 제11권1호
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• pp.50-57
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• 2015

연구에서는 국내 D 석탄 화력발전소에서 비회 이송량 35,800 kg/h의 용량으로 운전 중인 비회 이송설비를 대상으로 최대 비회 이송량을 예측하였다. 수평거리 550 m, 수직거리 40 m, 엘보우 9개소, 직경 0.254 m의 이송관으로 구성된 비회 이송관로와 트립(trip) 정압 1,163 mmH2O, 풍량 5,040 m3/h인 용적식 비회 이송 송풍기로 이루어진 비회 이송 시스템에서 최대 비회 이송량은 비회 이송량의 증가에 따른 비회 이송 시스템의 압력 손실과 용적식 비회 이송 송풍기의 트립 정압이 같아질 때이며, 이 조건 하에서 가능한 최대 비회 이송량은 52,600 kg/h로 예상되었다.

• 자원환경지질
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• 제31권6호
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• pp.509-518
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• 1998

Fly ashes have been deposited around Youngwol power plant until electrostatic precipitator was installed in 1981. Fresh fly ash samples from electrostatic precipitator and weathered fly ash from ash disposal site were collected from Youngwol power plant, along with 65 soil samples of nearby area to look into the influence of PFA deposit on the soils in surrounding area. In chemistry, EPA does not contain high level of toxic elements and there is no notable concentration of toxic elements in soil near power plant. Total concentrations of Co, Cr, Cu, V, and Zn are 13 ppm, 89 ppm, 73 ppm, 157 ppm and 57 ppm in PFA. Concentrations of theses elements in ash-rich soils are 15 ppm, 78 ppm, 60 ppm, 133 ppm and 68 ppm, and those in ash-poor soils are 19 ppm, 70 ppm, 38 ppm, 91 ppm and 97 ppm. But these metal elements are highly concentrated in magnetic fractions of EPA (Co, 129 ppm; Cr, 217 ppm; Cu, 210 ppm; V, 197 ppm; Zn 90 ppm). Considering the process of long-term weathering of PFA, potentially toxic substances from the ash could be leached into soils and groundwater.

• 대한기계학회논문집B
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• 제22권12호
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• pp.1691-1701
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• 1998

Fly ash produced in coal combustion is a fine-grained material consisting mostly of spherical, glassy, and porous particles. A study on the formation mechanism of the fly ash from coal particles in the pulverized coal power plant is investigated with a physical, morphological, and chemical characteristic analysis of fly ash collected from the Samchonpo power plant. This study may contribute to the data base of domestic fly ash, the improvement of combustion efficiency, fouling phenomena and ash collection in the electrostatic precipitator. The physical property of fly ash is determined using a particle counter for the measurement of ash size distribution. Morphological characteristic of fly ash is performed using a scanning electron micrograph. The chemical components of fly ash are determined using an inductively coupled plasma emission spectrometry(ICP). The distribution of fly ash size was bi-modal and ranged from 12 to $19{\mu}m$ in mass median diameter. Exposure conditions of flue gas temperature and duration within the combustion zone of the boiler played an important role on the morphological properties of the fly ash such as shape, particle size and chemical components. The evolution of ash formation during pulverized coal combustion has revealed three major mechanisms by large particle formation due to break-up process, gas to particle conversion and growth by coagulation and agglomeration.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1997년도 봄 학술발표회 논문집
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• pp.129-135
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• 1997

Recently, discarding of reuse of fly ashes produced from combined heat power plant of thermal power plant as a by-product causes several problems. Esepecially, the fly ash from Ulsan Pertrochemical Serviec Co, classified as class C is the first by-product to be reused or discarded. For the reuse of the class C fly ash, it is necessary to prepare and provide domestic specifications because there is no specifications on the fly ash of class C from combined heat power plant. Therefore, this study dealt with a scheme of introducing class C fly ash to the korean industrial standard.