Devolatilization of a single fuel particle in a fluidized bed under oxy-combustion conditions. Part A: Experimental results

Bu, Changsheng; Leckner, Bo G; Chen, Xiaoping; Pallarès, David; Liu, Daoyin; Gómez–Barea, Alberto

doi:10.1016/j.combustflame.2014.08.015

Cited by 68 publications

(15 citation statements)

References 31 publications

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“…The fuel used to feed the combustion chamber of the steam boiler was lignite with a lower heating value of 9960 kJ/kg and the following mass composition: carbon (c)-28.6%; hydrogen (h)-2.2%; sulfur (s)-0.95%; nitrogen (n)-0.25%; oxygen (o)-8%; ash (a)-17.5%; and water (w)-42.5%. It was assumed that the oxygen content in the oxidizer was 30% [57,58,72,73] and the excess oxidant ratio was 1.2. The flue gas flow rate was split in two to OH and NH-fed heat exchangers.…”

Section: Variant V1-steam Boiler and Description Of The Asumentioning

confidence: 99%

The Characteristics of a Modern Oxy-Fuel Power Plant

2019

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This paper presents the thermodynamic and economic analyses of four variants of a supercritical oxy-type plant. These variants differed in terms of air separation units (ASU, variants: V1—cryogenic; V2—hybrid; equipped with a three-end (V3a) or four-end (V3b) high-temperature membrane) and boilers (V1 and V3a—lignite-fired fluidized-bed; V2 and V3b—hard-coal-fired pulverized-fuel). The gross power of steam turbine unit (STU) was 600 MW. The live and reheated steam parameters were 650 °C/30 MPa and 670 °C/6.5 MPa, respectively. The influence of the ASUs’ operating parameters on the ASUs’ auxiliary power rate and boiler efficiency (V3a and V3b only) was studied. The ASUs’ operating parameters for maximum net efficiency were then determined. The decrease in the net efficiency compared to a reference plant (with a classic fluidized-bed or pulverized-fuel boiler) fluctuated in the range 7.2 (V3b)–11.2 (V1) p.p. An analysis of the waste heat utilization was performed (fuel drying—V1 and V3a; STU steam-water heat exchangers replacing). Thus, the efficiency decreases fluctuated in the range 4.3 (V3b)–10.2 (V1) p.p. The economic analysis showed that in order for the variants to be economically viable, the unit CO2 emission cost should be greater than 42.2 (V1) or 22.0 (V3b) EUR/MgCO2.

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Section: Variant V1-steam Boiler and Description Of The Asumentioning

confidence: 99%

The Characteristics of a Modern Oxy-Fuel Power Plant

2019

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“…Bu et al studied the devolatilization characteristics of a single fuel particle and the factors influencing the process, including atmosphere (air and oxy‐fuel mode), ignition, flame temperature, flame duration and devolatilization time in a quartz FB unit. Four different ranks of coal (lignite, sub‐bituminous, bituminous and anthracite) as well as wood were evaluated.…”

Section: Design and Operational Issuesmentioning

confidence: 99%

A review of oxy-fuel combustion in fluidized bed reactors

Mathekga

Oboirien

North

2016

Int. J. Energy Res.

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“…However, heterogeneous combustion was not included in the model and the combustion of volatiles was only considered as a source term to heat up the particle, and the fraction of the heat released from volatiles combustion, transferred to the particle, was determined by fitting to the experimental data. Part A of the present work [11] presents experimental results of devolatilization (ignition, flame temperature, flame life-time, devolatilization time) of a single fuel particle in O 2 /N 2 and O 2 /CO 2 atmospheres in a transparent and electrically heated FB, measured by thermocouples, color video camera, and two-color pyrometry. Five types of fuel in the form of nearly spherical particles with a diameter of 6 mm were investigated, including lignite coal (LC), sub-bituminous coal (SBC), bituminous coal (BC), anthracite coal (AC), and Schima wood (SW).…”

Section: Introductionmentioning

confidence: 99%