Oxidant control and air-oxy switching concepts for CFB furnace operation

Hultgren, Matias; Ikonen, Enso; Kovács, Jenö

doi:10.1016/j.compchemeng.2013.10.018

Cited by 24 publications

(11 citation statements)

References 8 publications

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“…In that research, the simulation results were consistent with findings in experiment (Weigl, 2009) and literature (Hultgren et al, 2014). It was also found that switching time is related to plant type, selected control strategy and switching strategy, and requirement for stable operation, and may be various under the same control and switching strategies.…”

Section: Limitations and Improvementssupporting

confidence: 91%

“…Then, owing to part of flue gas recycled to boiler for moderating the flame temperature, flexibility of control options and dependence on oxygen measurement and control (McDonald and Zadiraka, 2007) are increased than those of air-combustion. Different from air combustion, flue gas O 2 control and/or oxidant O 2 control (Hultgren et al, 2014) can be used to gain a reasonable combustion process. Like air combustion, flue gas O 2 control can be realized via the secondary pure O 2 or oxidant flow.…”

Section: Introductionmentioning

confidence: 99%

“…Like air combustion, flue gas O 2 control can be realized via the secondary pure O 2 or oxidant flow. For oxidant O 2 control, the first method (Hultgren et al, 2014) is the primary and secondary pure O 2 flows are used to control the respective O 2 content. Another one (Terushita et al, 2008) is the signal of boiler-brought-in oxygen concentration, which is an oxygen concentration for a total amount gases entered into boiler and calculated from measurements of composition and flow rates, can be sent to a flow control on RFG to keep this concentration within a prespecified range (25-30 wt.%).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic modeling and control for pulverized-coal-fired oxy-combustion boiler island

Jin

Chen²

2014

International Journal of Greenhouse Gas Control

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Section: Limitations and Improvementssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic modeling and control for pulverized-coal-fired oxy-combustion boiler island

Jin

Chen²

2014

International Journal of Greenhouse Gas Control

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“…Flowsheets are heavily interconnected, and plants are run close to their operational boundaries. Increased boiler sizes and technologies such as carbon capture and storage (CCS) have also introduced new design requirements for fluidized beds. − …”

Section: Introductionmentioning

confidence: 99%

Once-through Circulating Fluidized Bed Boiler Control Design with the Dynamic Relative Gain Array and Partial Relative Gain

Hultgren

Ikonen

Kovács

2017

Ind. Eng. Chem. Res.

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Combustion power plants currently face major performance challenges, which require robust control design methods. Extensive relative gain analysis was conducted in this paper to generate plantwide control structures for a full-scale once-through circulating fluidized bed boiler. No such study has been reported before for steam boilers. The partial relative gain was employed to generate decentralized control structures based on integral controllability with integrity. The approach provided feasible control structures and verified that basic turbinefollowing boiler control is preferable in terms of controllability. The steady-state results were extended with the dynamic relative gain array for higher frequencies, which revealed that boiler-following control becomes feasible for faster disturbances. The results highlight the complex interactions between steam pressure and output electrical power control, as well as the loop interactions caused by the feedwater flow in the once-through steam path.

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“…The process of transition between air-and oxy-fuel modes is currently being investigated by few research groups (Duan et al, 2014;Hultgren et al, 2014;Jia et al, 2012;Lupion et al, 2013;McCauley et al, 2009;Mine et al, 2013;Tan et al, 2012). Usually, researches focused on the transition rate.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Transition Time From Air to Oxy-Combustion

Lasek¹,

Lajnert²,

Głód³

et al. 2015

Chemical and Process Engineering

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In this paper some issues of the transition process from air-to oxy-combustion were investigated. Advantages of flexible combustion were described. Flexible combustion tests carried out at four European plants and five plants outside Europe of different scales of process and test parameters were presented. An analysis of the transition time from air to oxy-combustion of different laboratory and pilot scale processes was carried out. The "first-order + dead time" approach was used as a model to describe transition process. Transitional periods between combustion modes and characteristic parameters of the process were determined. The transition time depends not only on the facility's capacity but also it is impacted by specific operational parameters.

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Oxidant control and air-oxy switching concepts for CFB furnace operation

Cited by 24 publications

References 8 publications

Dynamic modeling and control for pulverized-coal-fired oxy-combustion boiler island

Dynamic modeling and control for pulverized-coal-fired oxy-combustion boiler island

Once-through Circulating Fluidized Bed Boiler Control Design with the Dynamic Relative Gain Array and Partial Relative Gain

Analysis of the Transition Time From Air to Oxy-Combustion

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