Dynamic simulation of a circulating fluidized bed boiler system Part I: Description of the dynamic system and transient behavior of sub-models

Kim, Seong‐Il; Choi, Sangmin; Yang, Jongin

doi:10.1007/s12206-016-1148-8

Cited by 10 publications

(11 citation statements)

References 18 publications

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“…1 Additionally, the response times to reach the steady state can be evaluated from the time constant (τ) determined by the boiler thermal capacity and the material flow rate. 9 The simulated time to reach 63.2% of the final value of the temperature at the furnace exit is about 330 s as shown in Figure 2(a), and this value is comparable to 300 s of the time constant of the CFB loop in the target boiler system. Figure 2(b) presents how the oxygen concentration of mass fraction decreases due to the increased fuel feed with the constant airflow value.…”

Section: Dynamic Simulation Resultsmentioning

confidence: 82%

“…The time constant of the CFB furnace, which is determined by the solid thermal mass and flue gas flow rate, was calculated and compared with the simulated response time of the solid temperature, as in Kim et al. 9 The time constant of the CFB loop of the target boiler system is about 300 s (total mass 190 t, flue gas flow rate 600 kg/s). This time constant is used as the check parameter for the dynamic calculation in the next section.…”

Section: Simulation Strategymentioning

confidence: 99%

“…Kim et al. 9,10 developed a dynamic model of a CFB boiler system with a drum loop, where the gas-solid side is connected to the water-steam side. The simulated performance was discussed along with the plant level performance of the steam power generation.…”

Section: Introductionmentioning

confidence: 99%

“…For the general cases of the dynamic simulation of the CFB furnace as listed above, 8–13 immediate interest of the simulation codes was on the steam dynamics in association with the load control system of the generated power. From the point of steam generation, the furnace side was simplified as the source of energy to the water-steam side, reflecting the lack of interest or the modeling challenges on the specific behavior of the furnace solid dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic simulation of the circulating fluidized bed loop performance under the various operating conditions

Kim

Choi

Lappalainen

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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In a circulating fluidized bed boiler, the large thermal mass and flow characteristics of the solids strongly affect the transient response of the circulating fluidized bed loop temperature, which determines the heat transfer rate to steam flow. Therefore, it is essential to interpret the dynamic response of the solid behavior in the circulating fluidized bed loop for the stable and efficient operation of the circulating fluidized bed boiler. In this study, the dynamic simulation of the solid behavior along with the flue gas flow in a circulating fluidized bed loop was performed by applying the core-annulus approach for the solid-gas flow inside the furnace and selected models for other physical phenomena of the fluidized bed. The circulating fluidized bed loop of a commercial boiler was selected as the target system. Especially, the model simulates the characteristics of the solid behavior, such as the local solid mass distribution, and the solid flow inside the furnace and the circulating solid according to the various operating conditions. These aspects are difficult to measure and quantify in a real power plant. In this paper, the simulated furnace temperature behavior as the representative performance parameter of the circulating fluidized bed loop was discussed along with the qualitative operation experiences reported in the literature. The operating conditions include the feed rate of fuel and air, the particle size, the solid inventory and the solid circulation rate. Furnace temperature behavior was reproduced through the simulation for each operating case in the literature and was analyzed with the solid behavior along with the combustion rate and heat transfer rate of the circulating fluidized bed loop. The simulation enables quantitative evaluation of the effect of the solid behavior on the temperatures of the furnace and return part in the various operating conditions.

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Section: Dynamic Simulation Resultsmentioning

confidence: 82%

Section: Simulation Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic simulation of the circulating fluidized bed loop performance under the various operating conditions

Kim

Choi

Lappalainen

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…The coal and air inflow rates were changed and the transient response of the bed temperature was estimated; good agreement was found between the simulations and experimental data from the same boiler regarding the aforementioned transient variables as well as critical steady-state parameters during 30 and 50% load operation. Finally, Kim et al (2016Kim et al ( , 2019 extended the model of Kim et al (2014Kim et al ( , 2015 to perform dynamic simulations as well, by calculating the incremental difference from the previous time step, and progressing for the next time step. Two dynamic simulations were performed for a 340 MWe CFB boiler and one with 1500 t/h steam production capacity.…”

Section: Introductionmentioning

confidence: 99%

Simulation of a CFB Boiler Integrated With a Thermal Energy Storage System During Transient Operation

Stefanitsis¹,

Nesiadis²,

Koutita³

et al. 2020

Front. Energy Res.

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In the current work, a transient/dynamic 1-dimensional model has been developed in the commercial software APROS for the pilot 1 MW th CFB boiler of the Technical University of Darmstadt. Experiments have been performed with the same unit, the data of which are utilized for the model validation. The examined conditions correspond to the steady-state operation of the boiler at 100, 80, and 60% heat loads, as well as for transient conditions for the load changes from 80 to 60% and back to 80%. Fair agreement is observed between the simulations and the experiments regarding the temperature profiles in the riser, the heat extracted by the cooling lances, as well as the concentration of the main species in the flue gases; a small deviation is observed for the pressure drop, which, however, is close to the results of a CFD simulation run. The validated model is extended with the use of a thermal energy storage (TES) system, which utilizes a bubbling fluidized bed to store/return the particles during ramp up/down operation. Simulations are performed both with and without the use of TES for the load path 100-80-60-80-100%, and the results showed that the TES concept proved to be superior in terms of changing load flexibility, since the ramp up and down times proved to be much faster, and lower temperature drops between the loads are observed in this case.

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Dynamic simulation of the water-steam flow in a supercritical once-through boiler

Kim

Choi

2017

J Mech Sci Technol

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Dynamic simulation of a circulating fluidized bed boiler system Part I: Description of the dynamic system and transient behavior of sub-models

Cited by 10 publications

References 18 publications

Dynamic simulation of the circulating fluidized bed loop performance under the various operating conditions

Dynamic simulation of the circulating fluidized bed loop performance under the various operating conditions

Simulation of a CFB Boiler Integrated With a Thermal Energy Storage System During Transient Operation

Dynamic simulation of the water-steam flow in a supercritical once-through boiler

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