Improvement of ammonia mixing in an industrial scale selective catalytic reduction De-NOx system of a coal-fired power plant: A numerical analysis

Sohn, Jung-Ho; Hwang, In Sik; Hwang, Jungho

doi:10.1016/j.psep.2020.09.043

Cited by 19 publications

(6 citation statements)

References 19 publications

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“…Today, the main global trend in the development of energy is to reduce the number of toxic substances and greenhouse gases emissions into the atmosphere. Much research has been devoted to investigating the issue of reducing emissions of harmful substances from the power generation units [14][15][16][17][18][19]. Many emission reduction methods are successfully used at the existing thermal power plants.…”

Section: Oxy-fuel Combustion Technology For the Combined Production O...mentioning

confidence: 99%

Research and Development of the Oxy-Fuel Combustion Power Cycle for the Combined Production of Electricity and Hydrogen

et al. 2023

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Modern trends in improving environmental safety have determined the urgency in creating innovative technologies that allow the production of electricity and hydrogen without the emission of harmful substances. However, at the moment, there are not so many technical solutions offering the combined production of these useful products with a high degree of efficiency and environmental friendliness. The transition to oxy-fuel combustion power cycles for the co-production of electricity and hydrogen is a prospective way to decrease carbon dioxide emissions into the atmosphere from the energy sector. To achieve zero emissions, the semi-closed oxy-fuel combustion cycle is combined with a steam methane reformer, which has a high energy efficiency through reducing losses in the steam turbine condenser. The modeling methodology has been described in detail, including the approaches to defining the working fluid properties and mathematical models of the different steam methane reforming plants and the oxy-fuel combustion power plant. According to the results of the thermodynamic analysis of the steam methane reforming plant, it was found that an increase in the temperature from 850 to 1000 °C leads to a decrease in the mass flow fuel by 16.3% due to the shift towards a direct reaction. Moreover, the optimal temperature in the reformer lies in the range of 900–950 °C. A comparison of the energetic and ecological characteristics of various steam methane reformer units showed that the scheme with oxy-fuel combustion is better compared to the scheme with CO2 capture by absorption in monoethanolamine; the efficiency is 6.9% higher and emissions of carbon dioxide are 22 times lower. According to the results of the thermodynamic analysis of a novel oxy-fuel combustion power cycle, it was found that its performance varied regarding the range of electricity production (123.6–370 MW) and hydrogen production (0–10.8 kg/s). The efficiency of the oxy-fuel combustion power cycle varies in the range of 47.2–70.1%. Based on the results of the operation regimes analysis, the energy complex performance map has been developed, allowing identification of the efficiency and working fluid massflow by net power and produced hydrogen massflow.

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Section: Oxy-fuel Combustion Technology For the Combined Production O...mentioning

confidence: 99%

Research and Development of the Oxy-Fuel Combustion Power Cycle for the Combined Production of Electricity and Hydrogen

et al. 2023

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“…Meanwhile, the catalyst layer pressure drop is simulated using porous media to produce a pressure loss comparable to the actual operating value. The governing equations were introduced in the references [14,15,17].…”

Section: Solver Settingsmentioning

confidence: 99%

“…Additionally, the in-line arrangement of static mixers could strengthen the disturbance of the fluid and promote the mixing of reductant NH 3 with the flue gas [16]. Sohn et al also suggested placing the AIG and mixer away from the catalyst layer to enhance the NH 3 mixing and flow uniformity together [17]. Moreover, Kim et al used a computational analysis technique to improve the uniformity of the NH 3 /NO molar ratio by controlling the flow rate of the ammonia injection nozzle according to the flow distribution of the nitrogen oxides in the inlet exhaust gas of the denitrification facility [18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Optimization of SCR-DeNOx Systems for Coal-Fired Power Plants Based on a CFD Method

Wang

Sun

et al. 2022

Processes

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In order to solve the problem of the uneven distribution of the flow and ammonia concentration field in the selective catalytic reduction (SCR) denitrification system of a 660 MW coal−fired power plant, a three−dimensional computational fluid dynamics (CFD) model was established at a scale of 1:1. The existing flow guide and ammonia fume mixing device were then calibrated and optimized. The relative standard deviation of the velocity field distribution upstream of the ammonia injection grid (AIG) was optimized from 15.4% to 9.9%, with a reasonable radius of the deflector at the inlet flue elbows, and the relative standard deviation of the velocity field distribution above the inlet surface of the first catalyst layer in the reactor was optimized from 25.4% to 10.2% by adjusting the angle between the deflector and the wall plate of the inlet hood. Additionally, with the use of a double−layer spoiler ammonia fume mixing device, the relative standard deviation of the ammonia mass concentration distribution above the inlet surface of the first catalyst layer in the reactor was optimized from 12.9% to 5.3%. This paper can provide a valuable reference with practical implications for subsequent research.

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“…Release of NOx among these gases has a significant impact on environmental degradation. The cause of NOx pollution is automotive exhausts, exhaust gases generated in industries like turbines, power plants and cement kilns (Amoatey et al 2019, Sohn et al 2021. When combustion occurs at high temperature, NOx is likely to be formed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis And Parameter Optimization On The Reduction of NOx From Diesel Engine Using RSM And ANN Model

Chenniappan

Ramya²,

Rajoo

et al. 2021

Preprint

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The feasibility of the Non-thermal Plasma (NTP) process is examined by four operating parameters including NOx concentration (300-400 ppm), gas flow rate (2-6 lpm), voltage (20-30 kV) and electrode gap (3-5 mm) using a Dielectric Barrier Discharge (DBD) reactor for removing NOx from diesel engine exhaust. Based on the NTP study, the NOx removal efficiency and energy efficiency of the NTP reactor are measured. Optimization of process parameters have been carried out using response surface-based Box Behnken Design (BBD) method and Artificial Neural Network (ANN) method. ANN based optimization is carried out using feed-forward network algorithm which has 4 input nodes, 10 hidden nodes and 2 output nodes. Based on the RSM and ANN model study, R2 value are obtained as 0.98 and 0.99 respectively. These models demonstrates that they have strong agreement with the experimental results. The results are indicated that the RSM model's optimum conditions resulted in a maximum NOx reduction of 60.5% and an energy efficiency of 66.24 g/J. The comparison between the two models confirmed the findings, whereas this ANN model displayed a stronger correlation to the experimental evidence.

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Improvement of ammonia mixing in an industrial scale selective catalytic reduction De-NOx system of a coal-fired power plant: A numerical analysis

Cited by 19 publications

References 19 publications

Research and Development of the Oxy-Fuel Combustion Power Cycle for the Combined Production of Electricity and Hydrogen

Research and Development of the Oxy-Fuel Combustion Power Cycle for the Combined Production of Electricity and Hydrogen

Numerical Simulation and Optimization of SCR-DeNOx Systems for Coal-Fired Power Plants Based on a CFD Method

Experimental Analysis And Parameter Optimization On The Reduction of NOx From Diesel Engine Using RSM And ANN Model

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