Statistical key variable analysis and model-based control for the improvement of thermal efficiency of a multi-fuel boiler☆

Shieh, Shyan-Shu; Chang, Yu-Teng; Jang, Shi-Shang; Ma, Ming; Huang, Tianyu

doi:10.1016/j.fuel.2009.07.001

Cited by 20 publications

(5 citation statements)

References 20 publications

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“…(2) Although advanced control has been recognized as an effective and feasible approach to the operation of fired heaters, and also model-based control strategies have been developed [7][8][9] for the purpose of optimal on-line operation of fired heaters. However, it still needs "upper-layer" optimization component to decide the best operating condition for the controller.…”

Section: Fig 1 the Thermal Efficiency As A Function Of The Excess Amentioning

confidence: 99%

RIMER and SA based thermal efficiency optimization for fired heaters

Gao

Lyu

et al. 2017

Fuel

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Section: Fig 1 the Thermal Efficiency As A Function Of The Excess Amentioning

confidence: 99%

RIMER and SA based thermal efficiency optimization for fired heaters

Gao

Lyu

et al. 2017

Fuel

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“…Some literatures have report mixing fuel systems such as BFG/coal [16], BFG/NG [17] and BFG/COG [18,19]. In steel industry, the low calorific value residual gases generated both in ironmaking and steelmaking process, such as BFG, COG and Linz Donawitz Gas (LDG), are utilized as supplemental fuels by furnaces within the steel plant especially boilers to generate steam to provide mechanical energy, thermal energy and electrical energy [15,18,19].…”

Section: Introductionmentioning

confidence: 99%

Numerical study of a tangentially fired boiler for reducing steam tube overheating

Tang

Johnson

et al. 2016

Applied Thermal Engineering

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A comprehensive numerical and experimental study on a 200 MW tangentially fired boiler firing metallurgical gases was conducted. A three-dimensional Computational Fluid Dynamics (CFD) model was developed to simulate the flow characteristics and combustion process inside the boiler. The Eddy Dissipation Concept combustion model was applied to take into account detailed turbulent interactive reacting chemical reactions. Field experiments were also conducted on the original tangentially fired boiler under different operation conditions. Flame profiles videos were captured during experiments. A quick comparison of the experimental flame profile with numerical simulation results shows good agreement. Wall steam tubes overheating problem was observed, and the hot spots were identified based on a wide range of typical operation conditions. The effect of total fuel input and natural gas percentage on the furnace wall temperature were investigated.

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“…Blast furnace gas (BFG) and coke oven gas (COG), which are byproducts of the iron and steel manufacturing processes in the iron and steel industries, are important secondary energy sources. − The BFG mainly contains N 2 , CO 2 , and CO and slight amounts of H 2 . It is a typical low-heating-value gaseous fuel, with a lower heating value of ∼3700 kJ Nm –3 .…”

Section: Introductionmentioning

confidence: 99%

“…Multifuel combustion is usually used to improve the economic performance by increasing the fuel flexibility, improving combustion behavior, mitigating operation problems, and decreasing gaseous pollutant emissions. The subject has been discussed in some studies, − in which most of them focused on two-fuel combustion systems. Among the existing use methods for using BFG and COG, co-firing BFG and/or COG with pulverized coal in boilers is the most common method. − It is flexible in boiler operating when the parameters of the BFG and/or COG stream are unstable, because the pulverized-coal feed rate can be increased to ensure the boiler load when the flow rate of BFG and/or COG decreases.…”

Section: Introductionmentioning

confidence: 99%

“…The subject has been discussed in some studies, − in which most of them focused on two-fuel combustion systems. Among the existing use methods for using BFG and COG, co-firing BFG and/or COG with pulverized coal in boilers is the most common method. − It is flexible in boiler operating when the parameters of the BFG and/or COG stream are unstable, because the pulverized-coal feed rate can be increased to ensure the boiler load when the flow rate of BFG and/or COG decreases. COG is also able to serve as a reburning fuel for NO reduction in the power plant.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Multifuel Combustion in a 200 MW Tangentially Fired Utility Boiler

et al. 2011

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A computational fluid dynamics (CFD) model of a 200 MW multifuel tangentially fired boiler has been developed using Fluent 6.3.26, which is able to model the three-fuel combustion system of coal, blast furnace gas (BFG), and coke oven gas (COG) with an eddy-dissipation model for simulating the gas-phase combustion. A level of confidence in the current CFD model has been established by carrying out a mesh independence test and validation against the experimental data obtained from the boiler for case study. The validated CFD model is then applied to investigate the effects of different BFG and COG flow rates on the boiler performance. It is found that increasing the BFG flow rate brings negative effects on the ignition of primary air and pulverized-coal mixture, pulverized-coal burnout, and heat transfer in the furnace and, consequently, decreases the thermal efficiency. However, increasing the COG flow rate can increase the thermal efficiency via improving the pulverized-coal burnout and heat transfer. Increasing both the BFG and COG flow rates is favorable for reducing NO emissions. The results also indicate that co-firing pulverized coal with BFG of about 20% heat input and COG of about 10% heat input is an optimal operating condition for improving the boiler performance at 180 MW load. The present study provides helpful information for understanding and optimizing the multifuel combustion of the boiler.

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Statistical key variable analysis and model-based control for the improvement of thermal efficiency of a multi-fuel boiler☆

Cited by 20 publications

References 20 publications

RIMER and SA based thermal efficiency optimization for fired heaters

RIMER and SA based thermal efficiency optimization for fired heaters

Numerical study of a tangentially fired boiler for reducing steam tube overheating

Numerical Simulation of Multifuel Combustion in a 200 MW Tangentially Fired Utility Boiler

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