A Combustion Process Optimization and Numerical Analysis for the Low Emission Operation of Pulverized Coal-Fired Boiler

Madejski, Paweł; Janda, Tomasz; Modliński, Norbert; DanielNabagło,

doi:10.5772/64442

Cited by 9 publications

(11 citation statements)

References 49 publications

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“…This technology (Acoustic gas temperature measurement system) became possible with the use of acoustic methods of temperature measurement. So in the papers [10,17,19] detailed application of acoustic temperature sensors in combustion chambers of real power plants was described. The operating principle of this system is based on the realization of the functional dependence of the speed of sound on the temperature of the medium through which it propagates.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of heat and mass transfer processes in the combustion chamber of industrial power plant boiler. Part 1. Flow field, temperature distribution, chemical energy distribution

Аскарова

Maximov

Bolegenova

et al. 2017

ACM

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In the present paper, the furnace chamber of the BKZ-160 boiler of Almaty TPP-3 (Kazakhstan) has been calculated. The thermal characteristics of the process were studied in the form of the distribution of temperature fields and chemical energy, and the aerodynamics of the combustion chamber was also calculated. The type of fuel, its elementary and fractional composition, exerts the greatest influence on the course of heat-mass exchange processes and aerodynamics. The computational experiment was carried out with two models of particle size distribution: a polydisperse fuel flame (the particle diameter varies from 10 to 120 μm) and monodisperse fuel flame (particle size identical and equal to d p = 60 μm). Based on the results of the computational experiments, the main regularities in the distribution of heat fluxes in the combustion chamber volume and flow aerodynamics were obtained. It is shown that the greatest thermal load falls on the central region of the walls of the combustion chamber and the location of the burner devices, which is typical for both mono-and polydisperse fuel flames. The temperature data obtained as a result of the computational experiment showed better convergence with the empirical data obtained directly at TPP-3. Aerodynamics of the flow for the two selected models of particle size distribution has insignificant differences, but how they affect other characteristics of the process is one of the following tasks in view of the authors. It should be noted that the calculation of the polydisperse fuel flame takes much more calculation time.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of heat and mass transfer processes in the combustion chamber of industrial power plant boiler. Part 1. Flow field, temperature distribution, chemical energy distribution

Аскарова

Maximov

Bolegenova

et al. 2017

ACM

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show abstract

“…Insufficient steam flow causes temperature increase and thermal stresses in turbine stages. It is important to revise all of the control loops and measuring devices in case the of power unit operation at low loads to avoid exploitation and performance problems [7,17]. The steadystate simulation analysis of the power unit model shows a good accordance to reference operating data throughout the power unit operating range.…”

Section: Discussionmentioning

confidence: 99%

“…However, it does not give any information about the effects of dynamic changes in power system operation. This type of thermodynamic modelling is a perfect engineering tool to give a global view of the thermal cycle performance [5][6][7]. Table 4.…”

Section: Thermodynamic Analysis Of Power Unit In Off-design Conditionsmentioning

confidence: 99%

Analysis of Coal-Fired Power Unit Operation in Reduced Minimum Safe Load Regime

Żymełka¹,

Żyrkowski²,

Bujalski³

2018

Thermal Power Plants - New Trends and Recent Developments

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Large coal-fired power plants were typically designed as a base load units. Any changes in load level, as well as start-up time, are noticeably slow on that kind of units. However, in order to adapt to changing market conditions with increasing number of renewable energy sources, coal-fired power plants need to improve their flexibility. In the paper, 200 MWe class unit has been taken into consideration. During the test campaign, a minimum safe load of the unit was decreased from 60 to 40%. Paper presents results of a model that was made using Ebsilon ® Professional software. The simulation model is comprised of boiler and turbine part of the power unit. Obtained results were validated using measurements collected from the test campaign. Parameters important from the technical and economical point of view were investigated. Results revealed that simulation model can be utilised successfully to scrutinise coal-fired units under off-design operation conditions. As the outcome of the performed analysis, a number of issues related to low load operation of the coal-fired unit are presented and discussed. Paper indicates sensitive areas that need to be addressed when operation in decreased safe load is considered. Finally, overall potential for flexibility improvement for 200 MWe class coal-fired units has been evaluated.

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“…Usually the combustion of coal is divided into two stages of pyrolysis and char combustion . For the simulation of pyrolysis process, the bis parallel reaction model was used.…”

Section: Model Formulationmentioning

confidence: 99%

Experimental research and numerical analysis on thermal dynamic characteristics of rotary kiln

Wang

Cheng

2019

Can J Chem Eng

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The rotary kiln is a piece of equipment that consumes an extensive amount of energy. The thermal dynamic characteristics of the rotary kiln include conduction, convection, radiation, and combustion characteristics, which are closely bound up with the energy consumption of the kiln. In this paper, both experimental and numerical studies are performed to understand the relationship between the thermal dynamic characteristics of the rotary kiln and the factors that affect them. In the experimental section, the shell temperature and coating thickness of the kiln cylinder were measured, which shows the thermal dynamic characteristics of the rotary kiln. In the numerical section, a three-dimensional numerical model with ANSYS software is set up to research the fluid flow, combustion, and heat transfer characteristics of the rotary kiln under different working conditions. The numerical simulation results presented reasonable agreement with the experimental data. The results indicate that coating thickness affects the heat transfer conduction of the kiln and the burner structure affects the combustion and convection heat transfer in a kiln. Fugitive constituents of coal, pulverized coal concentration, excess air ratio, and oxygen content can influence the characteristics of the combustion and heat transfer processes.

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A Combustion Process Optimization and Numerical Analysis for the Low Emission Operation of Pulverized Coal-Fired Boiler

Cited by 9 publications

References 49 publications

Numerical investigation of heat and mass transfer processes in the combustion chamber of industrial power plant boiler. Part 1. Flow field, temperature distribution, chemical energy distribution

Numerical investigation of heat and mass transfer processes in the combustion chamber of industrial power plant boiler. Part 1. Flow field, temperature distribution, chemical energy distribution

Analysis of Coal-Fired Power Unit Operation in Reduced Minimum Safe Load Regime

Experimental research and numerical analysis on thermal dynamic characteristics of rotary kiln

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