• Title/Summary/Keyword: heavy oil fly ash

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Preparation and characterization of SRF(Solid Refuse Fuel) using heavy oil fly ash (중유회를 활용한 고형연료 제조 및 특성)

  • Min, Hong;Cho, Sung-su;Seo, Minhye;Lee, Soo-Young;Choi, Changsik
    • Journal of the Korea Organic Resources Recycling Association
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    • v.27 no.4
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    • pp.83-90
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    • 2019
  • In this study, the characteristics of the SRF (Solid Refuse Fuel) prepared by blending each of the additives (citrus peel, waste wood, coal) in the heavy oil fly ash, evaluating the heavy oil fly ash recyclability. Recycling SRFs were fabricated by pellet extruding method after blending the heavy oil fly ash and additives based on 30% moisture content. As a result, the formability of the SRFs was excellent under condition of blending heavy oil fly ash with coal or citrus peel and the highest calorific value was 4,274 kcal/kg at heavy oil fly ash mixed with coal. Therefore, the formability and calorific value were improved when the heavy oil fly ash was mixed with coal(20 wt%) at 30% moisture content. From these results, the applicability of SRFs with additives was confirmed by using the heavy oil fly ash from J thermal power plant.

Study on Incineration Behavior of Heavy Oil Fly Ash for Valuable Metal Recovery (유가금속(有價金屬) 회수(回收)를 위한 중유회(重油灰)의 연소거동(燃燒擧動)에 관한 연구(硏究))

  • Choi, Young-Yeon;Nam, Chul-Woo;Kim, Byoung-Gyu
    • Resources Recycling
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    • v.18 no.1
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    • pp.22-29
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    • 2009
  • To design and construct a moving bed stoker incinerator for incineration treatment of the domestic oil fly ash, operating condition and moving bed area of incinerator were determined by performing incinerate experiment of the oil fly ash in the muffle furnace which simulates moving bed stoker incinerator in all conditions. Incineration process of the oil fly ash could be divided into 3 stages, every stage needs the appropriate operating condition for effective incineration. The optimum content of water in the heavy oil fly ash was found to be 20 wt% to prevent the ash from flying and reduce the volume. Science combustion rate of oil fly ash depends on the oxygen content, the incinerator must have a equipment to control the oxygen content in the combustion air. The optimum temperature was $750{\sim}800^{\circ}C$ in order to prevent adhesion to the stocker and evaporation of metal compounds of low melting point. Uniform combustion reaction and acceleration of combustion rate required agitation during the combustion of oil fly ash. The incineration rate was $12.53kg/m^2hr$ and the working area of moving bed incinerator was found to be $60m^2$ to incinerate 18 tons of oil fly ash per day.

Use of Heavy Oil Fly Ash as a Color Ingredient in Cement Mortar

  • Mofarrah, Abdullah;Husain, Tahir
    • International Journal of Concrete Structures and Materials
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    • v.7 no.2
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    • pp.111-117
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    • 2013
  • Heavy oil fly ash (HOFA) is a byproduct generated by the burning of heavy fuel oil. Chemical analysis showed that HOFA is mainly composed of unburned carbon with a significant amount of heavy metals. Due to toxicity, management of this waste poses a challenge to the industry personal. The present study investigates the possible use of HOFA as a black pigment or admixture in cement mortar aiming to produce ornamental brick. In order to investigate the change of cement mortar strength when HOFA is added, the standard compressive strength test with 50 mm cubes was performed. The results showed that the addition of 2-5 % of HOFA in cement mortar does not affect its strength. The leaching behavior of trace elements within HOFA and HOFA mixed mortar were investigated through laboratory batch leaching experiments. The results confirmed that HOFA can be utilized as a black pigment in ornamental brick, which is environmentally safe and provides good balance between color and brick properties.

Manufacture of Vanadium pentoxide and nickel sulfate from heavy oil fly ash

  • Park, Gyeong-Ho
    • Resources Recycling
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    • v.2 no.4
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    • pp.23-26
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    • 1993
  • This work is carried out to develop the recovery process of vanadium as vanadium pentoxide and nickel as nickel sulphate from the leaching solution of heavy oil fly ash. First, sodium chlorate solution was added to the leaching solution to oxidize vanadium ions. With adjusting pH of the solution and heating, vanadium ions(V) is hydrated and precipitated as red cake of $V_2O_5$ from the solution. After recovering vanadium, nickel is recovered as ammonium nickel sulfate with crystallization process. From this nickel salt, nickel sulfate which meets the specifications for the electroplating industry can be produced economically. More than 85% of vana-dium and nickel in the fly ash are recovered in this process.

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Reduction of Fluorine, Boron and Heavy Metals Leaching from Coal Ash by Adding Fixation Chemicals

  • Iwasaki, Makoto;Inoue, Kaori;Ikeshima, Kazuya;Ishizuka, Tadashi
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • 2006.06a
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    • pp.105-110
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    • 2006
  • In order to utilize coal fly ash (hereafter : coal ash ) discharged from coal boiler as a material for civil engineering usage such as snow melter or soil improver, we have to prevent leaching hazardous elements such as fluorine boron and heavy metals from the coal ash because the leaching concentrations of some elements in the ash exceed the Japanese standards for environmental soil quality. Through the laboratory experiments and mill trials we confirmed that the leaching concentrations of fluorine, boron and heavy metals were maintained below their environmental standards by mixing with fixation chemicals and curing for a short time.

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Pyrolysis oil refining by Fly-ash absorption (Fly-ash 흡착기법을 이용한 열분해유 정제)

  • Im, EunJung;Kim, SungHyun;Chun, ByungHee;SunWoo, Hwan;Jeong, IckCheol
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.222-222
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    • 2011
  • Plastic product is increasing by the growth of its demand and most of refused plastics are incinerated or reclaimed. However, the refused plastic is not easily decomposed and has the environmental problem with its various toxic gas in case of incineration. Therefore, many countries such as USA, Japan, Germany and other developed industrial countries as well as Korea are interested in studying the recyclable resource of refused plastic. The macromolecular waste pyrolysis has the advantage of collecting of raw materials in high price and can at least get fuel gas or oil with high heat capacity. It also discharges low waste gas and low toxic gas including SOx, NOx and HCl heavy metals. However, pyrolyzed oil includes enough excess unsaturated hydrocarbons to form tar, which can cause the nozzle of engines to plug when pyrolyzed oil is used as fuel. Activated carbon was proven to have prominent adsorption capability among the other adsorbents that were mainly composed of carbon. This study examined the possibility of application in activated charcoal of its solid formation by analysing the feature of pyrolysis which is one of the chemical recycling methods and getting chemical analysis of the product and activated energy. Analyze the element of the oil produced by pyrolysis using GC-MS. The experiment of tar adsorption using fly-ash showed that fly-ash improved the optical intensity of pyrolyzed oil and decreased oxygen compounds in the pyrolyzed oil.

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Effect of Activated Carbon and Diatomite on Deodorant Efficiency of Recycled Fly Ash Panel (중유회 탈취패널에 있어서 활성탄과 규조토의 탈취성능 영향평가)

  • Kim, Min-Ho;Kim, Young-Kyu;Han, Kenneth N.;Kim, Se-Jung;Kim, Nam-Soo;Hong, Seong-Yeup;Han, Hyea-Chul
    • Journal of Korean Society of Environmental Engineers
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    • v.32 no.6
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    • pp.625-630
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    • 2010
  • This study aims to examine the possible use of heavy oil fly ash as raw material for deodorization panels by adding additives such as activated carbon and diatomite during deodorization panel manufacturing process and improving the performance of formaldehyde and toluene elimination.The recycled heavy oil flyash deodorization panel to be used either of them as additives removed more than 93% of formaldehyde and more than 97% of toluen but the compressive strength was decreased 27 to 63%. In an experiment to be used both additives, Whereas, the panel to include activated carbon 5% and diatomite 5% removed 84% against formaldehyde and 96% against toluen, and the compressive strength was increased 32% better than standard panel. Therefore it could be confirmed that the recycled heavy oil flyash deodorization panel is increased the compressive strength and the removal efficiency against harmful chemical substances by using the additives mixture.

A Study on the Leaching of Vanadium and Nickel from Heavy Oil Fly Ash (중유회로부터 바나듐과 니켈 침출에 관한 연구)

  • 박경호
    • Resources Recycling
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    • v.1 no.1
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    • pp.29-36
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    • 1992
  • The extration of vanadium and nickel from heavy oil fly ash was carried out by using water ans sulfuric acid as leaching agent. In the leaching with water, vanadium and nickel were extracted 86% and 88% respectively under pulp density of 25g/l, room temperature and leaching time of 60 minutes, but extraction of vanadium decreased with increasing leaching time. Addition of oxidant decreased the extractions of vanadium and nickel, and roasting of fly ash at temperature higher than $300^{\circ}C$ before water leaching decreased the vanadium extraction to about zero. In the leaching with 1N sulfuric acid, the extractions of vanadium and nickel both increased to 96% and the addition of oxidant did not affect the extraction of these metals.

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Study of heavy fuel oil fly ash for use in concrete blocks and asphalt concrete mixes

  • Al-Osta, Mohammed A.;Baig, Mirza G.;Al-Malack, Muhammad H.;Al-Amoudi, Omar S. Baghabra
    • Advances in concrete construction
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    • v.4 no.2
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    • pp.123-143
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    • 2016
  • Use of heavy fuel fly ash (HFFA) (diesel and cracked fuel) for power generation in Saudi Arabia has generated and accumulated large quantities of HFFA as a byproduct. In this research, HFFA is studied with the emphasis on the utilization of this waste material in concrete blocks and asphalt concrete mixes. Two types of mixes, one with low and other with high cement content, were studied for concrete blocks. Different mixes having varying percentages of HFFA (0% to 25%), as cement/sand replacement or as an additive, were studied. The performance of concrete blocks is evaluated in terms of compressive strength, water absorption, durability and environmental concerns. The results showed that blocks cannot be cast if more than 15% HFFA is used; also there is a marginal reduction in the strength of all the mixes before and after being exposed to the sulfate solution for a period of ten months. HFFA is studied in asphalt concrete mixes in two ways, as an asphalt modifier (3&5%) and as a filler (50%) replacement, the results showed an improvement in stiffness and fatigue life of mixes. However, the stability and indirect tensile strength loss were found to be high as compared to the control mix due to moisture damage, indicating a need of using antistripping agents. On environmental concerns, it was found that most of the concerned elements are within acceptable limits also it is observed that lower concentration of barium is leached out with the higher HFFA concentrations, which indicates that HFFA may work as an adsorbent for this leaching element.