Insitu gasification – chemical looping combustion of large coal and biomass particles: Char conversion and comminution

Pragadeesh, K. Sekar; Iyyaswami, Regupathi; Sudhakar, D. Ruben

doi:10.1016/j.fuel.2021.120201

Cited by 6 publications

(3 citation statements)

References 57 publications

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“…Primary fragmentation affects the rate of fuel conversion, emissions, and fine particulates generation in an FR, thus constituting a critical design input. Two specific works were focused on the investigation of the char conversion rate and the attrition of various fuel particles under fluidized bed CLC conditions. , Fragmentation of fuel particles immediately after the introduction into a combustion environment was attributed to the thermal shock created by the temperature gradient, which often results in a large number of fragments. During the later stages of devolatilization, fragmentation occurred due to the mechanical stresses created by the evolution of volatile matter at high temperatures.…”

Section: Effect Of Volatiles On Bio-clcmentioning

confidence: 99%

Chemical Looping for Combustion of Solid Biomass: A Review

Coppola¹,

Scala

2021

Energy Fuels

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Chemical looping combustion of solid biomass has the unique potential to generate energy with negative carbon emissions, while entailing an energy penalty compared to traditional combustion that is lower than that of the competing carbon capture technologies. In spite of these attractive features, research is still needed to bring the technology to a fully commercial level. The reason relies on a number of technological challenges mostly related to the oxygen carrier performance, its possible detrimental interaction with the biomass ash components, and the efficiency of the gas–solid contact with the biomass volatiles. This review is focused on these specific challenges which are particularly relevant when firing biomass rather than coal in a solid-based chemical looping combustion process. Special attention will be given to the most recent findings published on these aspects. Related performance evaluation by modeling, system integration, and techno-economic analysis will also be briefly reviewed.

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Section: Effect Of Volatiles On Bio-clcmentioning

confidence: 99%

Chemical Looping for Combustion of Solid Biomass: A Review

Coppola¹,

Scala

2021

Energy Fuels

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“…Several innovative ways of utilizing fossil fuels and reducing their impact on the environment have been explored and are still being investigated [3]. Some of the methods are fluidized bed combustion [4], oxy-fuel combustion [5], chemical looping combustion [6], etc., which aim at reducing the pollutants at the combustion stage itself. In addition, the application of fossil fuels is being investigated in high-end thermal power plants such as ultra super-critical power plants [7].…”

Section: Introductionmentioning

confidence: 99%

System Design, Optimization and 2nd Law Analysis of a 100 MWe Double Reheat s-CO2 Power Plant at Full Load and Part Loads

Manavalla,

M.,

Daniel

et al. 2023

Sustainability

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Super-critical Carbon dioxide (s-CO2) power plants are considered to be efficient and environmentally friendly compared to the traditional Rankine cycle-based steam power plants and Brayton cycle-based gas turbine power plants. In this work, the system design of a coal-fired 100 MWe double reheat s-CO2 power plant is presented. The system is also optimized for efficiency with turbine inlet pressures and the recompression ratio as the variables. The components needed, mass flow rates of various streams and their pressures at various locations in the system have been established. The plant has been studied based on 1st and 2nd laws at full load and at part loads of 80%, 60% and 40%. Operating parameters such as mass flow rate, pressure and temperature have considerably changed in comparison to full load operation. It was also observed that the 1st law efficiency is 53.96%, 53.93%, 52.63% and 50% while the 2nd law efficiency is 51.88%, 51.86%, 50.61% and 48.1% at 100%, 80%, 60% and 40% loads, respectively. The power plant demonstrated good performance even at part loads, especially at 80% load, while the performance deteriorated at lower loads. At full load, the highest amount of exergy destruction is found in the main heater (36.6%) and re-heaters (23.2% and 19.6%) followed by the high-temperature recuperator (5.7%) and cooler (4.1%). Similar trends were observed for the part load operation. It has been found that the recompression ratio should be kept high (>0.5) at lower loads in order to match the performance at higher loads. Combustion and heat exchange due to finite temperature differences are the main causes of exergy destruction, followed by pressure drop.

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“…Most previous works on the CLC of biomass have been conducted experimentally. The OC properties, − interaction between OC and biomass ash, − effect of high volatility on combustion efficiency, , and overall performance evaluation and economic analysis have been reported. Experimental measurements normally have the disadvantages of high costs and harsh operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Impact of Particle Size Polydispersity on Chemical Looping Combustion of Biomass under a Continuous Injection Mode

Wang

Lin

et al. 2022

Energy Fuels

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Particle size polydispersity considerably influences the chemical looping combustion (CLC) of solid fuels. In the present work, a three-dimensional multiphase particle-in-cell (MP-PIC) method was established and applied to study the full-loop CLC of biomass under a continuous injection mode. After model validation, the gas−solid flow characteristics, solid circulation rate (SCR), particle mixing in a fuel reactor (FR), and biomass leakage at different oxygen carrier (OC) particle size distribution (PSD) widths and biomass densities were systematically explored. The results showed that OC particles significantly stratified within the FR and both loop seals. Moreover, the fluctuation amplitude of the SCR decreased as the OC PSD width increased. Small biomass particles were more likely to leak. The number fraction of total leaked biomass particles first decreased and then increased as the OC PSD width increased. In the FR, small OC particles were primarily distributed in the upper part of the bed, and large particles were mainly distributed in the lower part. In addition, within the test range, the magnitude of the density difference between biomass and OC particles positively correlated with the likelihood of biomass leaking. These observations are all beneficial for the design and optimization of the CLC process of biomass.

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Insitu gasification – chemical looping combustion of large coal and biomass particles: Char conversion and comminution

Cited by 6 publications

References 57 publications

Chemical Looping for Combustion of Solid Biomass: A Review

Chemical Looping for Combustion of Solid Biomass: A Review

System Design, Optimization and 2nd Law Analysis of a 100 MWe Double Reheat s-CO2 Power Plant at Full Load and Part Loads

Impact of Particle Size Polydispersity on Chemical Looping Combustion of Biomass under a Continuous Injection Mode

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