Optimization of air staging in a 1 MW tangentially fired pulverized coal furnace

Li, Sen; Xu, Tongmo; Suo, Hui; Zhou, Qulan; Tan, Houzhang

doi:10.1016/j.fuproc.2008.08.005

Cited by 51 publications

(38 citation statements)

References 16 publications

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“…This indicates that the reducing effect of fuel-rich zones in the primary combustion zone diminishes possibly due to a large amount of unburned char with high char-N entering into relatively higher localized oxygen concentrations (carbon burnout zone) converting char-N into more NO emission. Other studies [21][22][23] have also reported low NO x reduction efficiency at very low SR1.…”

Section: Effect Of Burner Dynamicsmentioning

confidence: 93%

Deep-staged, oxygen enriched combustion of coal

Daood

Nimmo

Edge

et al. 2012

Fuel

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Section: Effect Of Burner Dynamicsmentioning

confidence: 93%

Deep-staged, oxygen enriched combustion of coal

Daood

Nimmo

Edge

et al. 2012

Fuel

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“…Fuel bound nitrogen contributes to about 80% -95% towards the NO x formation in pulverized coal combustion while the balance is associated with the thermal and prompt NO x . Fuel bound nitrogen during coal combustion is generally split into volatile-N and char-N [11]. This division preferentially depends upon nitrogen content and volatility of coal along with the combustion conditions such as temperature, residence time, and heating rates [11].…”

Section: Effect On No Emissionsmentioning

confidence: 99%

“…Fuel bound nitrogen during coal combustion is generally split into volatile-N and char-N [11]. This division preferentially depends upon nitrogen content and volatility of coal along with the combustion conditions such as temperature, residence time, and heating rates [11]. In the case of sub bituminous coals, the volatile-N comprising of tarry compounds decay rapidly to hydrogen cyanide (HCN) or soot-nitrogen [12][13].…”

Section: Effect On No Emissionsmentioning

confidence: 99%

Fuel additive technology – NOx reduction, combustion efficiency and fly ash improvement for coal fired power stations

Daood

Ord²,

Wilkinson³

et al. 2014

Fuel

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11Fuel additive technology is based on the use of a solid, fuel additive (iron, aluminium, calcium and silicon 12 based oxides), to reduce NOx emission, improve the quality of fly ash and result in 1-3% coal savings for 13 pulverised coal combustion. The findings in this study have been mainly based on extensive 14 experimentation on 100kWth down fired-combustion test facility (CTF) and partially on a 260tons/hr 15 steam commercial producing water tube pf boiler. International Innovative Technologies (IIT) developed 16 this additive based technology for the combined effect of reducing NOx from the combustion of 17 hydrocarbon fuels (mainly coal) and more specifically to improve the combustion process of fossil fuels 18 resulting in an ash by product with improved loss on ignition and lower carbon content. The improvement 19 in the combustion thermal efficiency of the commercial 260tons/hr steam producing boiler has been 20 calculated as per the direct calculation method of EN BS12952-15:2003 standard. 22 23Keywords: Fuel, additive, NOx, fly ash, combustion efficiency, coal, boiler, BS EN12952-15 (2003). 24 * Corresponding author: Email:s.daood@iituk.com; speme@hotmail.co.uk 25 26 27 Introduction 28The consumption of coal is increasing continuously on a global scale and is likely to 29 increase in forthcoming years due to its cheaper pricing compared with other conventional fuels 30 and further economic expansion in developing countries. However, the environmental 31 regulations and legislation has enforced a rise in carbon floor pricing and heavy penalties 32 towards breaching caps on emissions. In USA, the environmental protection agency has 33 proposed to implement 1,100 pounds (499 kgs) of cap on CO 2 emissions generated for every 63The proof of the concept to utilise IIT's fuel additive that has already been tested on Experimental test facilities and methods 67The pilot scale combustion test facility (CTF) comprises of a down-fired pulverised coal steam air heater, flue gas recirculation or circulating pump arrangements. 95The following were the calculations utilized for the purpose of determining the Thermal 177Similarly in a separate study related to pyrolytic cracking of coal tar, the initial heavy tar in the volatile-N. The increase in the gas yield (Table 4) Effect on Loss on ignition (LOI) 254The United States of America, India, China and Australia are the major producers of fly freeze-thaw conditions. Similarly excessive carbon affects the optimum density and moisture 262 content for filling applications.

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“…Air-staged combustion is one of the most efficient technologies for reducing NO x emissions and it has been the most widely adopted technology in coal-fired power plants around the globe [185]. A lot of laboratory, pilot-scale and full-scale research work have been carried out on NO x generation under air-staged conditions [192,[148][149][150][151][152][153][154][155][156][157][158][159][160] and most tests show a continuing decrease in NO x emissions as long as the amount of combustion air is shifted away from the burner and added as overfire air / oxidant at different levels to the furnace. This oxidant staging effect can reduce the conversion rate of coal-N to NO x by more than 50 % [161].…”

Section: Air Staging Influencementioning

confidence: 99%

“…and is for that conducive to NO x destruction and therefore produce less NO x emissions until the furnace end [154,162,176]. The major problem regarding the residence time is that the temperature profiles inside a furnace cannot be calculated.…”

Section: Air Staging Influencementioning

confidence: 99%

Predictions of NOx emissions in pulverized coal combustion.

Hachenberg

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Optimization of air staging in a 1 MW tangentially fired pulverized coal furnace

Cited by 51 publications

References 16 publications

Deep-staged, oxygen enriched combustion of coal

Deep-staged, oxygen enriched combustion of coal

Fuel additive technology – NOx reduction, combustion efficiency and fly ash improvement for coal fired power stations

Predictions of NOx emissions in pulverized coal combustion.

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