A hybrid simulation of a 600 MW supercritical circulating fluidized bed boiler system

Wu, Haochuang; Yang, Chen; He, Hongyan; Huang, Sheng-Jie; Chen, Hao

doi:10.1016/j.applthermaleng.2018.07.102

Cited by 22 publications

(12 citation statements)

References 33 publications

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“…The calculated temperature distribution in the furnace was similar to the experimental results, the maximum error was less than 25 • C, and the porosity distribution and solid-phase velocity distribution in the furnace were correct. The distribution of gases was similar to that of other fluidized bed boilers [24]. The results show that the model has fairly high precision and can be used for further research.…”

Section: Discussionsupporting

confidence: 66%

“…In order to simulate those reactions, such as devolatilization, volatile and char combustion, desulfurization, NOx formation, and denitration, only the major reactions have been taken into consideration. The corresponding reaction rates were given in our previous research [24]. In order to calculate the gas-solid phase heterogeneous reaction (such as coke combustion, limestone decomposition, desulfurization, denitration reaction, etc.…”

Section: Chemical Reactionsmentioning

confidence: 99%

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Study on Powder Coke Combustion and Pollution Emission Characteristics of Fluidized Bed Boilers

Yang

Deng

et al. 2019

Energies

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The fluidized reactor is widely used in a number of chemical processes due to its high gas-particle contacting efficiency and excellent performance on solid mixing. An improved numerical framework based on the multiphase particle-in-cell (MP-PIC) method has been developed to simulate the processes of gas–solid flow and chemical reactions in a fluidized bed. Experiments have been carried out with a 3-MW circulating fluidized bed with a height of 24.5 m and a cross section of 1 m2. In order to obtain the relationship between pollutant discharge and operating conditions and to better guide the operation of the power plant, a series of tests and simulations were carried out. The distributions of temperature and gas concentration along the furnace from simulations achieved good accuracy compared with experimental data, indicating that this numerical framework is suitable for solving complex gas–solid flow and reactions in fluidized bed reactors. Through a series of experiments, the factors affecting the concentration of NOx and SOx emissions during the steady-state combustion of the normal temperature of powder coke were obtained, which provided some future guidance for the operation of a power plant burning the same kind of fuel.

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Section: Discussionsupporting

confidence: 66%

Section: Chemical Reactionsmentioning

confidence: 99%

Study on Powder Coke Combustion and Pollution Emission Characteristics of Fluidized Bed Boilers

Yang

Deng

et al. 2019

Energies

Self Cite

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“…The pole is shifted left from − 1 T to − K c K + 1 T when K c > 0. Also, both (13) and (14) have the same static gain K. Thus, the compensated burning carbon could be accelerated. Figure 7 shows the unit step response of the compensated burning carbon and throttle steam pressure model at different loads, in which K c = 0.03.…”

Section: Supercriticalmentioning

confidence: 99%

“…The research has been extended to the supercritical CFB unit. In [13] a hybrid dynamic model was developed to characterize the main physical and chemical processes in a supercritical CFB boiler. Steady-state verification was made to evaluate the accuracy of the model while step responses of different manipulate variables were tested.…”

Section: Introductionmentioning

confidence: 99%

On the Flexible Operation of Supercritical Circulating Fluidized Bed: Burning Carbon Based Decentralized Active Disturbance Rejection Control

Zhang

Xue

et al. 2019

Energies

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Supercritical circulating fluidized bed (CFB) is one of the prominent clean coal technologies owing to the advantages of high efficiency, fuel flexibility, and low cost of emission control. The fast and flexible load-tracking performance of the supercritical CFB boiler-turbine unit presents a promising prospect in facilitating the sustainability of the power systems. However, features such as large inertia, strong nonlinearity, and multivariable coupling make it a challenging task to harmonize the boiler’s slow dynamics with the turbine’s fast dynamics. To improve the operational flexibility of the supercritical CFB unit, a burning carbon based decentralized active disturbance rejection control is proposed. Since burning carbon in the furnace responds faster than throttle steam pressure when the fuel flow rate changes, it is utilized to compensate the dynamics of the corresponding loop. The parameters of the controllers are tuned by optimizing the weighted integrated absolute error index of each loop via genetic algorithm. Simulations of the proposed method on a 600 MW supercritical CFB unit verify the merits of load following and disturbance rejection in terms of less settling time and overshoot.

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“…17,18 Sachajdak 19 presented a USC-CFB boiler study in which cosimulation with Apros and Aspen Plus Dynamics was applied to simulate the full chain of a carbon capturing and storage capable power plant. Wu 20 presented a modeling description for a 600 MW USC-CFB boiler model, where it was indicated that a CFB loop model was used, although the interaction of the solid–gas flow with the supercritical steam flow was not explicitly described. In summary of the previous research in the field, very limited cases of simulating the steam dynamics in a boiler system have been reported.…”

Section: Introductionmentioning

confidence: 99%

Dynamic simulation study of the steam temperature in a ultra-supercritical circulating fluidized bed boiler system

Kim

Choi

Song

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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A dynamic simulation of a modern ultra-supercritical circulating fluidized bed (USC-CFB) boiler system was performed using a physics-based model, where the boiler system was composed of an integrated system of heat exchanger (HEX) blocks. In each of the discretized elements of the HEX blocks, supercritical steam flow interacted with the solid–gas flow via heat transfer, and conservation laws, and physical phenomena of the CFB, and the supercritical steam flow was modeled to obtain the flow properties of each material side. By utilizing this model, the dynamic behavior of the main steam temperature, which was selected as the representative performance parameter for achieving safe and fast load changes, was simulated in response to changes applied to the main operating parameters such as the feedwater and fuel flow rates. The dynamic characteristics of the USC-CFB boiler were demonstrated by presenting the temperature responses of the steam and the circulating solid–gas after a step change in the feedwater and fuel flow rates. In the case of a load change, the dynamic response of the steam temperature was quantitatively presented by showing the transient overshoot and undershoot behavior, depending on the selection of the ramp speed when changing the feedwater and fuel flow rates. The steam temperature was also shown to be controlled by manipulating the inlet solid mass flow rate into the final superheater section of the external HEX. The comprehensive set of plant performance data that was generated from the model simulation can be utilized in setting up the operation strategies and/or in determining the control parameters for achieving stable steam temperature behavior during a load change.

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A hybrid simulation of a 600 MW supercritical circulating fluidized bed boiler system

Cited by 22 publications

References 33 publications

Study on Powder Coke Combustion and Pollution Emission Characteristics of Fluidized Bed Boilers

Study on Powder Coke Combustion and Pollution Emission Characteristics of Fluidized Bed Boilers

On the Flexible Operation of Supercritical Circulating Fluidized Bed: Burning Carbon Based Decentralized Active Disturbance Rejection Control

Dynamic simulation study of the steam temperature in a ultra-supercritical circulating fluidized bed boiler system

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A hybrid simulation of a 600 MW supercritical circulating fluidized bed boiler system

Cited by 22 publications

References 33 publications

Study on Powder Coke Combustion and Pollution Emission Characteristics of Fluidized Bed Boilers

Study on Powder Coke Combustion and Pollution Emission Characteristics of Fluidized Bed Boilers

On the Flexible Operation of Supercritical Circulating Fluidized Bed: Burning Carbon Based Decentralized Active Disturbance Rejection Control

Dynamic simulation study of the steam temperature in a ultra-supercritical circulating fluidized bed boiler system

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A hybrid simulation of a 600 MW supercritical circulating fluidized bed boiler system