Abstract
In the previous study, CFD simulation had been developed to predict combustion characteristic on the Fluidized Bed Boiler and Pulverized Boiler. The high demand on coal used for stoker-fired boilers in Indonesia the power plants provide challenge due to low thermal efficiency problem. In this study, CFD simulation is observed to predict the temperature distribution, heat of reaction, CO and CO 2 mass fraction on the stoker-fired boiler. Boiler geometry is modelled as the combustion chamber until the area before economizer. The selection of boundary conditions is set according to the governing equations available in the ANSYS Fluent software. Parameter design of coal which are particle size and properties of coal is determined to investigate the effect of the observed values. Four models are set to provide a combination of particle size and properties of coal. The solution strategy is developed to reduce instability of the simulation process. Coal combustion modelling includes several physical processes that could result in numerical stability issue when all processes are solved at once. The three stages were used to run the solution of the model. Plot of temperature distribution, heat of reaction, CO 2 and CO mass fraction is generated. The maximum temperature in the 1st to 4th model is 1440.95, 1473.85, 1347.72 and 1617.17 [ o K]. The amount of CO produced from each model tends to increase; respectively from the 1 st to 4 th model is 2.314E-07, 5.878E-07, 5.678E-07 and 7.904E-07. Based on the simulation results, it can be seen that the particle size of coal affects the combustion characteristic in the Stoker Coal-Fire Boiler.
Highlights
Stoker-fired boilers had been used for the combustion of coal in the power plant low thermal efficiency
Higher domestic demand for coal in Indonesia for power generation occurs due to adopted coal as it is inexpensive and readily available [1]
The influence of characteristic zones temperature of coal combustion in a stoker-fired boiler was investigated during the process of drying, degassing, and burn-out on changes in physical and chemical parameters of bituminous coal and slags [2]
Summary
Stoker-fired boilers had been used for the combustion of coal in the power plant low thermal efficiency. The influence of characteristic zones temperature of coal combustion in a stoker-fired boiler was investigated during the process of drying, degassing, and burn-out on changes in physical and chemical parameters of bituminous coal and slags [2]. The temperature distribution and particle residence time calculated incorporated with operating conditions and coal properties were used for the predictions. One of the most significant coal characteristics affecting UC content in coal combustion ashes is the particle-size effect [5]. Several parameters on the boiler performance problems in operating conditions can be predicted more easy and faster than experiment setting and measurement. CFD analysis for stoker fired boiler on the effect of particle size and properties of coal is investigated
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