• Journal of ILASS-Korea
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• v.11 no.1
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• pp.30-38
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• 2006

High temperature furnaces such as power plant and incinerator contribute considerable part of NOx generation and face urgent demand of De-NOx system. Reducing agent is injected into the flue gas flow to activate do-NOx system. Almost SCR system adopt vaporized ammonia injection system. Vaporizer, dilution system and additional space are needed to gasify and inject ammonia. Liquid spray injection system can simplify and economize post-treatment system of flue gas. In this study, mixing caused by gas or liquid injection of reducing agent into flue gas duct was investigated experimentally. Carbonated water was used as tracer and simulated agent and mixing of liquid spray in a duct flow was studied. To achieve that, the angle of attack of static mixer is simulated and $CO_2$ concentration is measured.

• 한국연소학회:학술대회논문집
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• 2000.12a
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• pp.132-139
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• 2000

Oxygen enriched incineration can increase the incineration capacity for wastes and dramatically reduce air pollutant emissions such as CO and dioxine by the allowing complete combustion of wastes in incinerator. Furthermore, this technology is proven to have many benefits including an energy-saving, cost-effective, and versatile application for diverse wastes compared with the conventional air incineration technology. The reduced pollutant emissions in flue gas and higher incineration efficiency are also available when the oxygen enriched air is used for the high temperature incineration systems. On the basis of the experimental results the oxygen enrichment system is successfully applied to the rotary kiln incinerator for industrial wastes. The oxygen enriched incineration system could be allowed more compact design of incinerator and flue gas treatment system due to both increasing incineration capacity and reducing flue gas volume. Therefore, oxygen enriched incineration technology is becoming highlighted in the waste incinerator which strongly require more stable efficiency and environmentally friendly and safe operationPut Abstract text here.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.11
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• pp.3246-3252
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• 2009

The interest on the recovery of thermal energy using the waste has been rising to solve the problems of continuous increase of waste generation and the depletion of the fossil fuel recently. The incineration has been used most popularly as a treatment process of the waste for the energy recovery. However, it is expected that incineration and design cost will increase in the treatment of air contaminant emitted from incinerator. This research has simulated the actual incinerator and the flue gas treatment system using the Aspen plus which is the software to simulate the chemical process. The incineration process is composed of the 1st and 2nd combustor to burn the waste, SNCR process to reduce the $NO_x$ using the urea, and the steam generation process to save the energy during incineration. The $Ca(OH)_2$ slurry was used as an acid gas (HCl, $SO_2$) treatment materials and the removal efficiency for the products from the neutralization of acid gas in SDA and combustion ash was simulated at the bag filter. The simulation result has been corresponded with the treatment efficiency of emitted gas from the actual industrial waste incinerator and it is presumed to be used to forecast the efficiencies of flue gas treatment system in the future.

• Korean Chemical Engineering Research
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• v.45 no.2
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• pp.197-202
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• 2007

This research was basically carried out to extend the application of $CO_2$ absorption processes for flue-gas system, which are mainly applied to a reforming process in petro-chemical industries. In general, MEA absorbent has some problems in flue-gas treatment, such as, degradation, regeneration energy and absorption capacities. As we known, sterical hindered amine, typically AMP (2-amino 2-methyl 1-propanol), have a good potential to improve these problems. In this paper, the characteristics of $CO_2$ absorption in aqueous AMP solution were measured and compared with that of MEA. It has been found that the $CO_2$ absorption capacity in AMP is double than that of MEA in the low $CO_2$ partial pressure system such as flue-gas. Also, the equilibriums of $CO_2$-AMP system were partially suggested, which are essentially needed to design the absorption process.

• 한국연소학회:학술대회논문집
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• 2003.05a
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• pp.231-239
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• 2003

In this study, the waste of landfill was treated using advanced enriched oxygen combustion system. The oxygen concentration of this study was 21%, 25%, 30% and 40% and the operating capacity was 200 g/min and the residence time was 10 minutes. As increased the oxygen concentration of combustion air. temperature of the incinerator was increased and the temperature was increased rapidly when the oxygen concentration was 30%. As increased the oxygen concentration, the NOx (ppm) of flue gas increase d for thermal NOx, however the CO (ppm) of flue gas decreased according to the increase of combustion efficiency . The optimum operation condition of incineration was obtained when the oxygen concentration is 30%${\sim}$40%. The unburned carbon of ash decreased from 10% to 4% when the oxygen concentration was increased from 21% to 30%, therefore the high combustion efficiency can be obtained if used the oxygen enriched combustion system.

• Proceedings of the KIEE Conference
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• 1998.07e
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• pp.1806-1808
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• 1998

Tests of pilot-scale plasma DeSOx-DeNOx system using pulsed streamer corona were carried out. The system consists of the reactor with wire-plate electrodes the $30kW_{max}$. MPC type pulse generator, and $1MW_{th}$ pulverized coal combustor as a flue gas source. $NH_3$ and $C_2H_4$ were used to enhance the removal rate. The experimental result on the removal efficiency of SOx/NOx and on the effect of the additives was presented in this paper.

• Journal of Environmental Science International
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• v.18 no.7
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• pp.755-765
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• 2009

Some sections of the exhaust system to determine the shape of the duct is to suffer the difficulties by space constraints to install new equipment of the environment post-treatment for existing operation of the power plants. In this paper the large duct in flue gas desulfurization equipments of the 500MW coal-fired power plant on the current operation is numerically analyzed from induced draft fan exit to booster up fan inlet section which is in the narrow space of the exhaust system with four times bending and is connected to emergency duct to bypass the exhaust gas on the emergency operation. The procedure and method using computational fluid dynamics are proposed to maintain the stability of the guide vane with the uniform flow and a minimum pressure loss of exhaust gas in the case of normal and emergency operation between the direction of the flow of exhaust gas duct at different.

• Applied Chemistry for Engineering
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• v.21 no.3
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• pp.243-251
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• 2010

Nitrogen oxides (NOx) in combustion flue gas are currently mitigated by chemical processes such as catalytic reduction, absorption and adsorption. However, development of environmentally sustainable biological processes is necessary in the near future. In this paper, the up-to-dated R&D trend of biological methodologies regarding NOx removal was reviewed, and their advantages and disadvantages were discussed. The principles and applications of bacterial system including nitrification and denitrification and photosynthetic microalgae system were compared. In order to enhance biological treatment rate and performance, the insoluble nitric oxide (NO) should be first absorbed using a proper solubilization agent, and then microbial degradation or fixation is to be followed. The use of microalgal system has a good prospect because it can fix $CO_2$ and NOx simultaneously and requires no additional carbon for energy source.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.23 no.11
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• pp.1464-1472
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• 1999

Design and operation of $1MW_{th}$ pulverized coal combustion testing facility are described. Also the influence of air staging on NOx emission and burnout of coal flames was investigated in this facility. The test facility consisted of coal feeding system, firing system and flue gas treatment system. A top-fired externally air staging burner was adopted in order to avoid influence of gravity on the coal particles and for easy maintenance. Distribution of temperature and chemical species concentration of coal flames could be measured in vertical pass of furnace. Main fuel was pulverized (83.4% less than $80{\mu}m$) Australian high bituminous coal. From variety of test conditions, overall excess air ratio was selected at 1.2(20% excess air). Tho study showed that increasing the staged air resulted in lower NOx omission, and it was suggested to be more than 40% of the total combustion air for the substantial NOx reduction. Sufficient burnout was not achievable when NOx emission was less than 500ppm. Also, the amount of core air did not influence tho NOx reduction.

• Journal of Korean Society for Atmospheric Environment
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• v.8 no.4
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• pp.262-268
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• 1992

The trend of international concerns on environmental conservation and domestic demand of ambient air quality improvement, specially on sulfur dioxide level has resulted in the establishment of mid-term strategy of environmental improvement and stepwise strengthening of emission regulations in this decade in Korea. Development of flue gas desulfurization(FGD) process is becoming an essential task to be accomplished especially for the power plants and large industrial facilities. This study is an initial stage researc focusing on the mass transfer principles in wet type FGD process and the effects of operating variables of a jet bubbling scrubber utilizing limestone slurry on sulfur dioxide removal efficiency. Experimental results showed this type of scrubbing system has some advantages in terms of mass transfer mechanism and removal efficiency. More rigorous research is needed for the reaction system and the comparison with existing FGD processess for the possible development of a process which is compatative in view of installation cost and treatment of by-products.