Thermal design of heat-exchangeable reactors using a dry-sorbent CO2 capture multi-step process

Moon, Hokyu; Yoo, Hoanju; Seo, Hwimin; Park, Yong Ki; Cho, Hyung Hee

doi:10.1016/j.energy.2015.03.034

Cited by 22 publications

(4 citation statements)

References 28 publications

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“…The main alternative heat sources to drive the calcination process include chemical looping [19][20][21][22], which uses oxygen carriers to transfer oxygen from air to the fuel, and indirect heat transfer from a combustor via solid heat carriers [15,23], heat transfer wall [15,24] or heat pipes [25,26]. The combined calcium and chemical looping system includes an additional reactoran air reactorin which the oxygen carrier reacts with oxygen in the air, forming a metal oxide.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the net efficiency of the retrofit scenario based on such a system is claimed to be 2.2% points higher than that of the state-of-the-art CaL retrofit [15]. In order to avoid the need for solids segregation, heat for the sorbent regeneration can be supplied from an external source, such as an additional circulating fluidised bed combustor, via either a heat transfer wall [15,24] or heat pipes [25,26]. Recently, the latter option has been experimentally proven [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Calcium looping combustion for high-efficiency low-emission power generation

Hanak

2017

Journal of Cleaner Production

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High-temperature solid looping technologies, such as calcium looping and chemical looping combustion are regarded as emerging CO 2 capture technologies with potential to reduce the net efficiency penalties associated with CO 2 separation. Importantly, high-temperature operation of these technologies allows utilisation of the high-grade heat for power generation. Building on these emerging technologies, this study intended to establish a new class of high-temperature solid looping combustion technologies for high-efficiency low-emission power generation called calcium looping combustion. Such combustion technology comprises a combustor, as a primary source of heat for indirect heating in a calciner, and a carbonator where CO 2 is separated from flue gas leaving the combustor; hence high-grade heat, which can be used for power generation, and a concentrated CO 2 stream, which can be either utilised or permanently stored, are generated. The techno-economic performance of calcium looping combustion was comparable to a conventional coal-fired power plant. Depending on whether the concentrated CO 2 stream is utilised elsewhere or permanently stored, calcium looping combustion was characterised with a net efficiency gain of 0.7% HHV points or a net efficiency penalty of 2.4% HHV , respectively. Additionally, the cost of CO 2 avoided for calcium looping combustion was estimated to be 10.0 €/tCO 2 and 33.9 €/tCO 2 , respectively. Therefore, similarly to chemical looping combustion, calcium looping combustion introduced in this study is a viable high-efficiency low-emission power generation technology that produces a concentrated CO 2 stream with no efficiency penalty associated with CO 2 separation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calcium looping combustion for high-efficiency low-emission power generation

Hanak

2017

Journal of Cleaner Production

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“…This introduces the main source of the parasitic load in the process, as O2 production is usually conducted in a cryogenic air separation unit that is characterised with a specific power requirement of 184-230 kWelh/tO2 [22][23][24]. The main alternative options to drive the calcination process include chemical looping [25][26][27][28], which uses oxygen carriers to transfer oxygen from air to the fuel, and indirect heat transfer from a combustor via solid heat carriers [29,30], heat transfer wall [30,31] or heat pipes [32,33].…”

Section: Introductionmentioning

confidence: 99%

High-efficiency negative-carbon emission power generation from integrated solid-oxide fuel cell and calciner

Hanak

Jenkins²,

Kruger³

2017

Applied Energy

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Direct air capture of CO2 has the potential to help meet the ambitious environmental targets established by the Paris Agreement. This study assessed the techno-economic feasibility of a process for simultaneous power generation and CO2 removal from the air using solid sorbents. The process uses a solid-oxide fuel cell to convert the chemical energy of fuel to electricity and high-grade heat, the latter of which can be utilised to calcine a carbonate material that, in turn, can remove CO2 from the air. The proposed process was shown to operate with a net thermal efficiency of 43.7-47.7%LHV and to have the potential to remove 463.5-882.3 gCO2/kWelh, depending on the fresh material used in the calciner. Importantly, the estimated capital cost of the proposed process (1397.9-1740.5 £/kWel,gross) was found to be lower than that for other low-carbon emission power generation systems using fossil fuels. The proposed process was also shown to achieve a levelised cost of electricity of 50 £/MWelh, which is competitive with other low-carbon power generation technologies, for a carbon tax varying between 39.2 and 74.9 £/tCO2. Such figure associated with the levelised cost of CO2 capture from air is lower than for other direct air concepts.

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“…Indirect-fired rotary kilns are well known in industry [20] and indirectly heated calciners, as proposed by Abanades et al [21], are presently investigated using heat-pipe-designs [22][23][24][25]. In addition, Moon et al [26] developed a multistep process for CO 2 capture consisting of double fluidized-bed tube-in-tube reactors. Tube-in-tube heat exchangers are used for heating, ventilation, and air conditioning (HVAC), cryogenic processes, waste heat recovery, space applications, as well as chemical and food processing.…”

Section: Introductionmentioning

confidence: 99%

Stop Smoking—Tube-In-Tube Helical System for Flameless Calcination of Minerals

2017

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Mineral calcination worldwide accounts for some 5-10% of all anthropogenic carbon dioxide (CO 2 ) emissions per year. Roughly half of the CO 2 released results from burning fossil fuels for heat generation, while the other half is a product of the calcination reaction itself. Traditionally, the fuel combustion process and the calcination reaction take place together to enhance heat transfer. Systems have been proposed that separate fuel combustion and calcination to allow for the sequestration of pure CO 2 from the calcination reaction for later storage/use and capture of the combustion gases. This work presents a new tube-in-tube helical system for the calcination of minerals that can use different heat transfer fluids (HTFs), employed or foreseen in concentrated solar power (CSP) plants. The system is labeled 'flameless' since the HTF can be heated by other means than burning fossil fuels. If CSP or high-temperature nuclear reactors are used, direct CO 2 emissions can be divided in half. The technical feasibility of the system has been accessed with a brief parametric study here. The results suggest that the introduced system is technically feasible given the parameters (total heat transfer coefficients, mass-and volume flows, outer tube friction factors, and -Nusselt numbers) that are examined. Further experimental work will be required to better understand the performance of the tube-in-tube helical system for the flameless calcination of minerals.

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Thermal design of heat-exchangeable reactors using a dry-sorbent CO2 capture multi-step process

Cited by 22 publications

References 28 publications

Calcium looping combustion for high-efficiency low-emission power generation

Calcium looping combustion for high-efficiency low-emission power generation

High-efficiency negative-carbon emission power generation from integrated solid-oxide fuel cell and calciner

Stop Smoking—Tube-In-Tube Helical System for Flameless Calcination of Minerals

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