Experimental characterization of pulverized coal MILD flameless combustion from detailed measurements in a pilot-scale facility

Weidmann, Max; Honoré, David; Verbaere, Vincent; Boutin, Guillaume; Grathwohl, Simon; Godard, Gilles; Gobin, Carole; Kneer, Reinhold; Scheffknecht, G.

doi:10.1016/j.combustflame.2016.01.029

Cited by 74 publications

(49 citation statements)

References 26 publications

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“…Saha et al [20][21][22][23] indicated that coal and biomass could both realize an efficient low NO x in a furnace supplied with a hot and vitiated coflow, which is supplied by a secondary burner with a turbulent nonpremixed swirl flame of natural gas. Moreover, Weidmann et al 24,25 summarized that diluting the reactants resulted in a low local heat release and low temperature increase in the reaction zone. Because a relatively low-temperature reaction environment could reduce the NO x generated from fuel-nitrogen combustion at a specific reaction rate, it is beneficial for realizing low-NO x emissions.…”

Section: Introductionmentioning

confidence: 99%

“…26,27 It should be noted that it is easier to reach low-NO x emissions by diluting the carrier gas than by diluting the combustion oxidant (air). 25 In previous studies, 28,29 we had conducted related experiments on diluting the combustion oxidant: hightemperature flue gas was generated by a precirculating fluidized bed (CFB), and the high-temperature flue gas from the CFB was used as the primary air for coal combustion in a rear CC. The results show that, compared with conventional combustion technologies, NO x emissions could be drastically reduced while maintaining high combustion efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, numerous numerical studies have proved that diluting the reactants contributes to reducing the combustion peak temperature and NO emissions 26,27 . It should be noted that it is easier to reach low‐NO x emissions by diluting the carrier gas than by diluting the combustion oxidant (air) 25 …”

Section: Introductionmentioning

confidence: 99%

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NO_x emissions of pulverized coal combustion in high‐temperature flue gas

Zhu

Lyu

2020

Asia-Pacific J Chem Eng

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An improved high-temperature flue gas combustion technology was developed and examined in this study. The high-temperature flue gas generator generated a flow of flue gas at a high temperature (720 C) with low oxygen content (10%), which flowed into the main combustion zone and acted as the carrier gas for pulverized bituminous coal (0-0.355 mm) in the combustion chamber. In the combustion chamber, the coal particles reached a higher combustion temperature (>1,100 C) in a short time, and the temperature difference was within 230 C, which showed that the local oxidation zone had been avoided. Furthermore, air-staging combustion technology was also adopted in combination with this technology. NO was the main nitrogen-containing compound, and the concentrations of other nitrogen-containing compounds (N 2 O, NH 3 , and HCN) were extremely low. The NO concentrations were reduced to 0 ppm twice when the volatiles released rapidly in the initial stage, and the volatiles burned violently in the intermediate stage, which are the main reasons for the significant reduction in NO x emissions. The original emissions of NO x were 187.2 mg/m 3 (@6% O 2), and the conversion ratio of fuel-nitrogen to NO x was 16.6%. High-temperature flue gas combustion technology has reached low-NO x combustion for pulverized coal.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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NO_x emissions of pulverized coal combustion in high‐temperature flue gas

Zhu

Lyu

2020

Asia-Pacific J Chem Eng

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“…MILD combustion is flameless, and it has the potential to offer ultralow pollutant emission, high thermal efficiency, enhanced combustion stability and fuel flexibility . MILD combustion has been successfully applied for gaseous fuels as well as pulverized fuels (with size 50‐120 μm) . Kiga et al successfully implemented the MILD combustion of high volatile pulverized coal using a drop tube furnace.…”

Section: Introductionmentioning

confidence: 99%

“…[21][22][23] MILD combustion has been successfully applied for gaseous fuels [24][25][26][27] as well as pulverized fuels (with size 50-120 μm). [28][29][30][31] Kiga et al 32 successfully implemented the MILD combustion of high volatile pulverized coal using a drop tube furnace. Suda et al 33 investigated the behavior of pulverized coal in high-temperature air combustion using a burner of 250 kW.…”

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confidence: 99%

Application of chemical looping air separation for MILD oxy‐combustion in the supercritical power plant with CO₂ capture

Chen

Sun

et al. 2018

Energy Science & Engineering

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Chemical looping air separation (CLAS) is a novel and promising technology for oxygen production. This paper presents the application of CLAS to the supercritical power plant for MILD oxy‐combustion. Compared with the reference conventional supercritical power plant, the power generation efficiency of the CLAS integrated MILD oxy‐combustion plant is only reduced by about ~1.37% points at the baseline case. CO2 compression process imposes additional ~3.97% points efficiency penalty, which is inevitable to all of the CO2 capture technologies. The net power efficiency of the CLAS integrated MILD oxy‐combustion plant is ~37.37%. Even though a higher reduction reactor temperature could boost the power efficiency and a higher oxidization reactor temperature reversely decreases the power efficiency, the influence of reactor temperature is marginal. The performance of CLAS integrated MILD oxy‐combustion plant is not sensitive to excess CO2 and O2 ratio. Different oxygen carriers have different suitable operating region, but possess similar power efficiency. The carbon capture rate of the CLAS integrated MILD oxy‐combustion plant is up to ~100%, resulting in a virtually carbon‐free fossil power plant.

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A complete review based on various aspects of pulverized coal combustion

Yadav

Mondal

2019

Int J Energy Res

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Summary Coal is the most abundant energy source, and around 40% of the world's electricity is produced by coal combustion. The emission generated through it put a constraint on power production by coal combustion. There is a need to reduce the emissions generated through it to utilize the enormous energy of coal for power production. Detailed understanding of various aspects of coal combustion is required to reduce the emissions from coal‐fired furnaces. The aim of present paper is to review various aspects of pulverized coal combustion such as oxy‐fuel combustion, co‐combustion of coal and biomass, emissions from pulverized coal furnaces, ash formation and deposition, and carbon capture and sequestration (CCS) technologies to outline the progress made in these aspects. Both experimental and numerical aspects are included in this review. This review also discusses the thermodynamic aspects of the combustion process. Furthermore, the effect of various submodels such as devolatilization models, char combustion models, radiation models, and turbulent models on the process of pulverized coal combustion has been investigated in this paper.

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Experimental characterization of pulverized coal MILD flameless combustion from detailed measurements in a pilot-scale facility

Cited by 74 publications

References 26 publications

NO_x emissions of pulverized coal combustion in high‐temperature flue gas

NO_x emissions of pulverized coal combustion in high‐temperature flue gas

Application of chemical looping air separation for MILD oxy‐combustion in the supercritical power plant with CO₂ capture

A complete review based on various aspects of pulverized coal combustion

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Experimental characterization of pulverized coal MILD flameless combustion from detailed measurements in a pilot-scale facility

Cited by 74 publications

References 26 publications

NOx emissions of pulverized coal combustion in high‐temperature flue gas

NOx emissions of pulverized coal combustion in high‐temperature flue gas

Application of chemical looping air separation for MILD oxy‐combustion in the supercritical power plant with CO2 capture

A complete review based on various aspects of pulverized coal combustion

Contact Info

Product

Resources

About

NO_x emissions of pulverized coal combustion in high‐temperature flue gas

NO_x emissions of pulverized coal combustion in high‐temperature flue gas

Application of chemical looping air separation for MILD oxy‐combustion in the supercritical power plant with CO₂ capture