Sensitivity analysis of oxy-fuel power plant system

Yan, Kai; Wu, Xiaojiang; Hoadley, Andrew; Xu, Xueyuan; Zhang, Jianwen; Lian, Zhang

doi:10.1016/j.enconman.2015.03.088

Cited by 29 publications

(11 citation statements)

References 20 publications

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“…In this study, flow models of the entire conventional and OC power generation systems were made. On the basis of the literature [10,14,15,19], as influencing factors, we selected four key operating parameters: oxygen purity (ϕ O 2 ), oxygen concentration (r O 2 ), recirculation rate of dry flue gas in boiler flue gas (χ 1 ), and the excess oxygen coefficient (α O 2 ). The single-factor and multifactor orthogonal influences of the above four operating parameters on the net standard coal consumption rate and the net electrical efficiency were analyzed.…”

Section: Resultsmentioning

confidence: 99%

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Sensitivity Analysis and Optimization of Operating Parameters of an Oxyfuel Combustion Power Generation System Based on Single-Factor and Orthogonal Design Methods

et al. 2020

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The main purpose of this paper is to quantitatively analyze the sensitivity of operating parameters of the system to the thermodynamic performance of an oxyfuel combustion (OC) power generation system. Therefore, the thermodynamic model of a 600 MW subcritical OC power generation system with semi-dry flue gas recirculation was established. Two energy consumption indexes of the system were selected, process simulation was adopted, and orthogonal design, range analysis, and variance analysis were used for the first time on the basis of single-factor analysis to conduct a comprehensive sensitivity analysis and optimization research on the changes of four operating parameters. The results show that with increasing oxygen purity, the net standard coal consumption rate first decreases and then increases. With decreasing oxygen concentration, the recirculation rate of dry flue gas in boiler flue gas ( χ 1 ) and an increasing excess oxygen coefficient, the net standard coal consumption rate increases. The net electrical efficiency was just the opposite. The sensitivity order of two factors for four indexes is obtained: the excess oxygen coefficient was the main factor that affects the net standard coal consumption rate and the net electrical efficiency. The influence of oxygen concentration and oxygen purity was lower than that of excess oxygen coefficient, and χ 1 has almost no effect.

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Section: Resultsmentioning

confidence: 99%

“…In this model, semi-dry flue gas recirculation was used. That is, the dry cycle was used for the primary gas flow, and the wet cycle was used for the secondary gas flow [10,11].…”

Section: Oc Power Generation Unitmentioning

confidence: 99%

Sensitivity Analysis and Optimization of Operating Parameters of an Oxyfuel Combustion Power Generation System Based on Single-Factor and Orthogonal Design Methods

et al. 2020

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“…RFG are heated up to 375 °C [21]. Similar layouts are found elsewhere [23][24][25]. Kakaras et al proposed the same idea for oxy-fuel retrofit power plants [32] but for new designed installations they included oxygen preheating with CO 2 of the CPU and flue gases before the mixing with RFG [27].…”

Section: Key Systems For Waste Energy Recoverymentioning

confidence: 87%

“…First studies quantified the penalty around 11-12 efficiency points [19][20][21]. For pulverized coal power plants efficiency improvement strategies have been focused on the flue gas recycle [22] comparing the differences between dry, semi-dry and wet recirculation to reduce the penalty to around 10 efficiency points [23] or designing optimum flue gas recycle process based on exergy analysis [24]. An exergy-based methodology was also proposed to assess the energy penalty of different first generation oxy-fired pulverized coal power plants [25].…”

Section: Introductionmentioning

confidence: 99%

An operational approach for the designing of an energy integrated oxy-fuel CFB power plant

Espatolero

Romeo

Escudero

et al. 2017

International Journal of Greenhouse Gas Control

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Oxy-fuel combustion is one of the key alternatives for coal power production with near-zero CO 2 emissions. Technology has been successfully proved in demonstration facilities and the next step is to improve its efficiency to facilitate the application to future commercial installations. The use of pure oxygen reduces the total volume of flue gases and concentrates CO 2 at boiler outlet. Nevertheless, there is an important energy penalty and efficiency of the power plant substantially decreases around 10-12 efficiency points. Increasing the oxygen concentration in the boiler up to 40% is a recent proposal to raise boiler efficiency and it is also an interesting solution to overcome the energy penalties of the kind of CCS system. Air separation unit (ASU) and compression and purification unit (CPU) are the main processes that reduce the efficiency. Heat integration results mandatory in order to improve the overall power plant efficiency by reducing the energy penalty. Many solutions have tried to show outstanding efficiency results but practical proposals are necessary to develop the technology. The use of flue gases waste energy to recycle flue gases heating up, oxygen preheating and increasing temperature of feedwater to steam cycle has been proposed to surpass the efficiency reduction. Nevertheless, care should be taken as potential problems would appear if only theoretical analysis is carried out. This work deals with a suitable and flexible design to increase the overall efficiency of a second oxy-fuel combustion power plant working with high O 2 concentration. Waste energy has been integrated avoiding any potential risk/damage into a new designed steam cycle. Finally, results are compared with a previously optimized power plant design without operational restrictions and just a slight reduction in power plant net efficiency (less than 1%) was observed between both concepts.

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“…They have also found that the increase in fuel humidity affected system efficiency under pressure operation (Gopan et al, 2020). Yan et al (2015) have compared three modes of flue gas recirculation: dry, semi-dry, and wet in the supercritical oxy-fuel combustion power cycle. They found that the optimized semi-dry process showed the highest efficiency and ease of operation.…”

Section: Introductionmentioning

confidence: 99%

The Oxy-Fuel Combustion Power Plant Model with Desulphurization Process and The Effect of Different Types of Coal on Operating Parameters

Erbaş¹,

Arat²

2021

European Journal of Science and Technology

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Clean coal technologies are defined as applications that improve environmental acceptability and efficiency in producing, preparing and using coal. With clean coal technologies, it is possible to increase the amount of energy obtained per unit ton by reducing emissions and wastes. However, today there are strict sanctions that must be followed due to the legal regulations on the protection of the environment and combating climate change. At this point, the clean coal-burning technologies in which the oxy-fuel combustion process (with the possibility of CO2 storage) takes place come to the fore. In this study, the method of burning fuel with oxygen in a thermal power plant with a gross electricity generation of 500 MW was discussed. This thermal power plant model also has a fluidized bed dryer, a desulphurization plant, and a CO2 storage process. The combustion results of different properties of coals were examined, and their effect on operating parameters was investigated.

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Sensitivity analysis of oxy-fuel power plant system

Cited by 29 publications

References 20 publications

Sensitivity Analysis and Optimization of Operating Parameters of an Oxyfuel Combustion Power Generation System Based on Single-Factor and Orthogonal Design Methods

Sensitivity Analysis and Optimization of Operating Parameters of an Oxyfuel Combustion Power Generation System Based on Single-Factor and Orthogonal Design Methods

An operational approach for the designing of an energy integrated oxy-fuel CFB power plant

The Oxy-Fuel Combustion Power Plant Model with Desulphurization Process and The Effect of Different Types of Coal on Operating Parameters

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