A comprehensive mass balance model of a 550 MWe ultra-supercritical CFB boiler with internal circulation

Li, Dong Fang; Ke, Xiwei; Zhang, Man; Yang, Hairui; Jung, Sungmook; Ahn, Seok-Gi; Jeon, Chung-Hwan

doi:10.1016/j.energy.2020.117941

Cited by 16 publications

(5 citation statements)

References 33 publications

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“…124 The average flow through these was 464 kg/s, corresponding to 3 kg MW −1 s −1 . 125 If the data from Wu et al based on pressure drops are excluded, the estimated circulation in the boilers is in the range of 15−60% of the needed flow.…”

Section: Actual Circulation In Gasifiers Andmentioning

confidence: 99%

“…Li et al used the temperature difference over external Intrex fluidized bed heat exchangers combined with temperature measurements, giving the ratio of internal and external circulation flows, to estimate the circulation flow through four of the total eight cyclones of a 550 MW e CFB boiler . The average flow through these was 464 kg/s, corresponding to 3 kg MW –1 s –1 . If the data from Wu et al based on pressure drops are excluded, the estimated circulation in the boilers is in the range of 15–60% of the needed flow.…”

Section: Actual Circulation In Gasifiers and Circulating Fluidized Be...mentioning

confidence: 99%

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Achieving Adequate Circulation in Chemical Looping Combustion─Design Proposal for a 200 MW_th Chemical Looping Combustion Circulating Fluidized Bed Boiler

et al. 2022

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Chemical looping combustion (CLC) has unique potential for avoiding the large costs and energy penalties of existing CO 2 capture technologies. Oxygen is transferred to the fuel using an oxygen carrier, thus avoiding contact between air and fuel. Consequently, the combustion products, CO 2 and H 2 O, come in a separate stream, and more or less pure CO 2 is obtained after condensation of H 2 O. CLC is normally conceived as a dual fluidized bed process, with high gas velocities in an air reactor driving the circulation, similar to circulating fluidized beds (CFBs), except that the material is led to a fuel reactor before being returned to the air reactor. Crucial for the process is the properties of the oxygen carrier and that circulation is sufficient to transfer needed oxygen and heat to the fuel reactor. Comprehensive literature shows successful use of many oxygen carriers in sustained pilot operation. In contrast, the need for reaching adequate circulation in an industrial-scale system has been given little consideration. Normally, a system similar to CFB boilers is assumed to give sufficient circulation. However, literature data indicate that circulation in CFB boilers is 5−50% of what is needed. Measures to provide sufficient circulation may cause difficulties, such as erosion or bed material loss in the cyclone. Here, a circulation system based on collection of the downflow of particles along the walls is proposed, and a design of a 200 MW th combined CLC−CFB boiler based on this principle is presented. Further, operational strategies and the need for flexibility are discussed. The design is focused on making an industrial-scale demonstration boiler, which can be used in CLC operation with different oxygen carriers and different fuels and that can explore different operational strategies to find optimal conditions. It is recommended that the upscaling of the technology aims directly at the industrial scale.

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Section: Actual Circulation In Gasifiers Andmentioning

confidence: 99%

Section: Actual Circulation In Gasifiers and Circulating Fluidized Be...mentioning

confidence: 99%

Achieving Adequate Circulation in Chemical Looping Combustion─Design Proposal for a 200 MW_th Chemical Looping Combustion Circulating Fluidized Bed Boiler

et al. 2022

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“…The combustion technology of a circulating fluidized bed (CFB) is a clean coal combustion technology that makes full use of inferior fuel resources. 1 In recent years, China has made breakthroughs in the power generation technology of supercritical CFB boilers, leading the world's development in this field. 2,3 With the increasing capacity of the CFB boilers, the conflict between heat transfer from combustion in the furnace and heat distribution in the boiler has become increasingly prominent.…”

Section: Introductionmentioning

confidence: 99%

“…The combustion technology of a circulating fluidized bed (CFB) is a clean coal combustion technology that makes full use of inferior fuel resources 1 . In recent years, China has made breakthroughs in the power generation technology of supercritical CFB boilers, leading the world's development in this field 2,3 .…”

Section: Introductionmentioning

confidence: 99%

Experimental study and safety analysis on the heating surfaces in the 660 MW supercritical CFB boiler under sudden electricity failure

Xie

et al. 2022

Energy Science & Engineering

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The necessity of equipping with an emergency water supply system in a supercritical circulating fluidized bed (CFB) boiler has long been a controversial topic in the industry. In this study, the heating surface of a 660 MW supercritical CFB boiler at the Pingshuo Power Station of China Coal Group is taken as the research object. And a boiler electricity failure experiment was accomplished at the power plant, and the variations of thermal parameters during electricity failure were obtained from power plant distributed control system. By analyzing the physical process of the heating surfaces during electricity failure, a mathematical model of heat transfer to the heating surface was established and a calculation program in Fortran language was developed. In this study, the effect of different flow rates and operating times of the supply pumps on the safety of the heating surfaces were then investigated. The numerical simulation results show that an emergency supply pump with a flow rate of 250 t/h, activated within 120 s, ensures the safety of the heating surface. The results of this study have important implications for the selection of emergency supply pumps and the determination of flow rates and pressures for supercritical CFB boilers with external beds.

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“…A full system approach based on zero-dimensional heat balance was preferred over a detailed 2 D-3D modelling of the only CFB boiler, as the latter is more popular in scientific papers. 29,[30][31][32] Model validation: Łagisza power plant as a case study…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of a supercritical circulating fluidized bed boiler for power generation under flexible operation

Bruzzone

Ravelli

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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It is well known that the Łagisza power plant in Poland is the world’s first supercritical circulating fluidized bed (CFB) boiler, whose commercial operation started on June 2009. It has attracted a great deal of interest and operational data are publicly available, therefore it has been chosen as the object of the present study aimed at assessing load and fuel flexibility of supercritical CFB plants. First, the thermal cycle was modelled, by means of the commercial code Thermoflex®, at nominal and part load conditions for validation purposes. After having verified the validity of the applied modelling and simulation tool, the advantage of having supercritical steam combined with CFB boiler over subcritical steam and pulverized coal (PC) boiler, respectively, was quantified in terms of electric efficiency. As a next step, the designed fuel, i.e. locally mined hard coal, was replaced with biomass: 100% biomass firing was taken into account in the case of subcritical CFB boiler whereas the maximum share of biomass with coal was set at 50% with supercritical CFB boiler, consistently with the guidelines provided by the world leading manufacturers of CFB units. A broad range of biomass types was tested to conceive mixtures of fuel capable of preserving quite high performance, despite the energy consumption in pretreatment. However, the overall efficiency penalty, due to biomass co-firing, was found to potentially undermine the benefit of supercritical steam conditions compared to conventional subcritical power cycles. Indeed, the use of low-quality biomass in thermal power generation based on steam Rankine cycle may frustrate efforts to push the steam cycle boundaries.

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A comprehensive mass balance model of a 550 MWe ultra-supercritical CFB boiler with internal circulation

Cited by 16 publications

References 33 publications

Achieving Adequate Circulation in Chemical Looping Combustion─Design Proposal for a 200 MW_th Chemical Looping Combustion Circulating Fluidized Bed Boiler

Achieving Adequate Circulation in Chemical Looping Combustion─Design Proposal for a 200 MW_th Chemical Looping Combustion Circulating Fluidized Bed Boiler

Experimental study and safety analysis on the heating surfaces in the 660 MW supercritical CFB boiler under sudden electricity failure

Performance evaluation of a supercritical circulating fluidized bed boiler for power generation under flexible operation

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A comprehensive mass balance model of a 550 MWe ultra-supercritical CFB boiler with internal circulation

Cited by 16 publications

References 33 publications

Achieving Adequate Circulation in Chemical Looping Combustion─Design Proposal for a 200 MWth Chemical Looping Combustion Circulating Fluidized Bed Boiler

Achieving Adequate Circulation in Chemical Looping Combustion─Design Proposal for a 200 MWth Chemical Looping Combustion Circulating Fluidized Bed Boiler

Experimental study and safety analysis on the heating surfaces in the 660 MW supercritical CFB boiler under sudden electricity failure

Performance evaluation of a supercritical circulating fluidized bed boiler for power generation under flexible operation

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Achieving Adequate Circulation in Chemical Looping Combustion─Design Proposal for a 200 MW_th Chemical Looping Combustion Circulating Fluidized Bed Boiler

Achieving Adequate Circulation in Chemical Looping Combustion─Design Proposal for a 200 MW_th Chemical Looping Combustion Circulating Fluidized Bed Boiler