Calcium looping CO2 capture system for back-up power plants

Criado, Yolanda A.; Arias, B.; Abanades, J.C.

doi:10.1039/c7ee01505d

Cited by 72 publications

(51 citation statements)

References 45 publications

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“…3). Moreover, the use of solids storage tanks in the CaL process integrated as a post-combustion CO 2 capture system could improve the plant efficiency and reduce CO 2 emissions by adapting the CaL operation to the power plant demand (Astolfi et al, 2019;Criado et al, 2017).…”

Section: Solids Storagementioning

confidence: 99%

Scaling-up the Calcium-Looping Process for CO2 Capture and Energy Storage

Ortíz

Chacartegui

Pérez‐Maqueda

et al. 2021

KONA

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The Calcium-Looping (CaL) process has emerged in the last years as a promising technology to face two key challenges within the future energy scenario: energy storage in renewable energy-based plants and CO 2 capture from fossil fuel combustion. Based on the multicycle calcination-carbonation reaction of CaCO 3 for both thermochemical energy storage and post-combustion CO 2 capture applications, the operating conditions for each application may involve remarkably different characteristics regarding kinetics, heat transfer and material multicycle activity performance. The novelty and urgency of developing these applications demand an important effort to overcome serious issues, most of them related to gas-solids reactions and material handling. This work reviews the latest results from international research projects including a critical assessment of the technology needed to scale up the process. A set of equipment and methods already proved as well as those requiring further demonstration are discussed. An emphasis is put on critical equipment such as gas-solids reactors for both calcination and carbonation, power block integration, gas and solids conveying systems and auxiliary equipment for both energy storage and CO 2 capture CaL applications.

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Section: Solids Storagementioning

confidence: 99%

Scaling-up the Calcium-Looping Process for CO2 Capture and Energy Storage

Ortíz

Chacartegui

Pérez‐Maqueda

et al. 2021

KONA

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“…The scope of this work is to perform an economic optimization of a CaL system with thermochemical energy storage and to find the economic optimal size of the storage silos and of the calciner for different carbon taxes and power plant load profiles. Compared with the work previously published on the same topic (Criado et al, 2017), the novelty of this work mainly consists in: (i) performing an economic optimization of the size of the storage silos and of the calciner and (ii) considering a CaL system with operating parameters relevant for daily/ weekly cycling and intermediate CFs (i.e. : storage of solids at temperatures close to CaL reactors one and moderate fresh limestone makeup flow rate) rather than for back-up systems with very low CF (i.e.…”

Section: Nomenclaturementioning

confidence: 99%

“…While waiting for conditions favorable for the scale-up of the technology, research on CaL process for post-combustion CO 2 capture recently focused on some specific topics, such as the operation of the calciner with high O 2 concentration to reduce fuel consumption and equipment size (Arias et al, 2018), the adoption of indirectly heated calcination to avoid the air separation unit (Martínez et al, 2016(Martínez et al, , 2011Reitz et al, 2016), the design of advanced configurations to transfer heat from the hot calcined solids to the colder carbonated sorbent (Martínez et al, 2012;Vorrias et al, 2013), techniques for improving the sorbent capacity by reactivation (Diego et al, 2016), the integration with renewables by solar assisted calcination (Matthews and Lipiński, 2012), the assessment and design of the process for application in cement plants (Arias et al, 2017;De Lena et al, 2017;Hornberger et al, 2017;Spinelli et al, 2018). Another research field on CaL for power plants which is attracting increasing interest is the exploitation of the calcined sorbent (CaO) as thermochemical energy storage medium, to improve the flexibility and reduce the cost of electricity of power plants in energy mixes with increasing share of intermittent renewable energy sources (Criado et al, 2017;Hanak et al, 2016). This paper, which derives from the research carried out in the RFCS project FlexiCaL (FlexiCaL, 2016), focuses on this last topic.…”

Section: Introductionmentioning

confidence: 99%

“…So, the idea assessed in this paper, Table 1 Representative yearly energy indicators of base-load pulverized coal power plant (PCPP) without CO 2 capture and with CO 2 capture by CaL process (PCPP + CaL). Capacity factor equal to 0.9. which was originally proposed for oxyfuel (Arias, 2016;Arias et al, 2014) and for CaL power plants (Criado et al, 2017), is to reduce the Capex associated to the oxyfuel calciner line by means of sorbent storage. According to this principle, the calciner line can be sized and operated at the average load of a target period (e.g.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved Flexibility and Economics of Calcium Looping Power Plants by Thermochemical Energy Storage

2018

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In this work, a Calcium looping (CaL) system including high temperature sorbent storage is presented, allowing to reduce the size of the calciner and the associated capital-intensive equipment (ASU and CPU). Reduction of the capital costs is particularly important for power plants with low capacity factors, which is becoming increasingly frequent for fossil fuel power plants in electric energy mixes with increasing share of intermittent renewables. The process assessment is performed by: (i) defining pulverized coal power plant (PCPP) with CaL capture system with and without sorbent storage and their mass and energy balances at nominal load; (ii) defining a simple method to predict the performance of the plant at part-load; (iii) defining the economic model, including functions for the estimation of the plant equipment cost; (iv) performing yearly simulations of the systems to calculate yearly electricity production, CO 2 emissions and levelized cost of electricity for different sizes of the calcination line and the storage system and (v) performing sensitivity analysis with different power production plans and carbon taxes. With this process, optimal size of the calciner and of the storage system minimizing the cost of electricity have been found. The optimal plant design was found to correspond to a solids storage system sized to manage the weekly cycling and a calciner line sized on the average weekly load. However, to avoid excessively large solids storage system, sizing the calciner on the average daily load and the storage system to manage the daily cycling appears more feasible from the logistic viewpoint and leads to minor economic penalty compared with the optimal plant design. For the selected case sized on the daily cycling, reduction of the cost of CO 2 avoided between 16% and 26% have been obtained compared to the reference CaL plant without solids storage, for representative medium and low capacity factor scenarios respectively.

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“…At present, only a few research studies have been done on energy storage technologies combined with CCS. Criado et al [25] designed a system for power plants operating with very low capacity factors and large load fluctuations, achieved by decoupling the operation of the carbonator and calciner reactors and connecting them to storage tanks filled with CaO or CaCO3 periods. Hanak et al [26] proposed three viable options for energy storage, including cryogenic O2 storage, CaO/CaCO3 solids storage, and CaO/Ca(OH)2 solids storage coupling the calcium looping system.…”

Section: Introductionmentioning

confidence: 99%

A calcium looping process for simultaneous CO2 capture and peak shaving in a coal-fired power plant

2019

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CO2 capture and peak shaving are two of the main challenges for coal-fired power plants in China. This paper proposed a calcium looping (CaL) combustion system with cryogenic O2 storage for simultaneous flue gas decarbonization and peak shaving for a 1000 MWe coal-fired power plant. The philosophy of this concept is that: 1) the boiler always operates at maximum continuous rating (MCR) to ensure the highest boiler efficiency; 2) during off-peak times, the excess energy output from coal combustion is used to provide heat for the calciner and produce pure oxygen for energy storage; 3) at peak times, the O2 produced is used to capture CO2 in the flue gas via the CaL process and reduce the CO2 abatement penalty; and 4) any excess O2 is treated as a by-product for commercial utilization. The whole system was simulated in Aspen Plus ® which shows that the net electric efficiency of the proposed system without cryogenic O2 storage system is 35.52%LHV (LHV, low heating value), while that of the conventional CaL system is 34.54%LHV. The proposed system can reduce the methane consumption rate by 38.5 t/h when methane is used as fuel in the calciner. Including the cryogenic O2 storage system, the peaking capability of the proposed system can range from 534.6

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Calcium looping CO₂ capture system for back-up power plants

Abstract: This work presents a highly flexible calcium looping CO2 capture system able to adapt to existing power plants forced to operate under very low capacity factors.

Cited by 72 publications

References 45 publications

Scaling-up the Calcium-Looping Process for CO<sub>2</sub> Capture and Energy Storage

Scaling-up the Calcium-Looping Process for CO<sub>2</sub> Capture and Energy Storage

Improved Flexibility and Economics of Calcium Looping Power Plants by Thermochemical Energy Storage

A calcium looping process for simultaneous CO2 capture and peak shaving in a coal-fired power plant

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