Controlling NOx emission from boilers using waste polyethylene as reburning fuel

Oluwoye, Ibukun; Zeng, Z.; Mosallanejad, Sara; Altarawneh, Mohammednoor; Gore, Jeff; Dlugogorski, Bogdan Z.

doi:10.1016/j.cej.2021.128427

Cited by 19 publications

(6 citation statements)

References 62 publications

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“…In boilers that operate at non-high temperatures, fuel NOx accounts for most of the boiler emissions (fuel NOx accounts for 95% in the fluidized bed, and the corners are generally rounded about 75%). Volatile NOx accounts for 60%-80% of the final NOx emission of the boiler, while coke NOx only accounts for a small part [5][6][7][8].The main purpose of the low-nitrogen burner modification is to control the amount of NOx generated by the fuel type and the thermal type NOx. The main method is to control the airfuel ratio in the local area of the boiler and the maximum temperature of combustion in the furnace.Domestic low-nitrogen burners reduce NOx by realizing pulverized coal concentration separation, air graded combustion, and large burn-out air rate [9][10].…”

Section: Introductionmentioning

confidence: 99%

Research on boiler test and combustion optimization control after low-nitrogen burner transformation

Jiang,

Wang,

Han

et al. 2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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This paper analyzes the principle of low-nitrogen burner modification and discusses the impact of low-nitrogen burner modification on boiler operation. The target unit underwent a low-nitrogen burner retrofit. The testers tested the cold and hot performance, analyzed the operating characteristics of the unit after transformation, and pointed out the direction of operation optimization. This paper summarizes the operation characteristics of dozens of low-nitrogen burners after transformation, analyzes the problems and corresponding optimization measures of low-nitrogen burners of different capacity units, and provides suggestions for the optimal operation of low-nitrogen burners after transformation.

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Section: Introductionmentioning

confidence: 99%

Research on boiler test and combustion optimization control after low-nitrogen burner transformation

Jiang,

Wang,

Han

et al. 2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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“…This technology mainly increases the concentration of reducing groups by injecting fuels containing hydrocarbons into the combustion zone of the kiln, thus increasing the reduction rate of NO x and achieving emission reduction. These fuels are generally natural gas, coal, biomass fuels [17][18][19], and even waste such as garbage [20]. Barraza [21] studied the combustion characteristics and pollutant emissions of natural gas mixed with bio-oil in a cyclone burner.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Selective Non-Catalytic Reduction Denitrification Process in Precalciner and the Effect of Natural Gas Injection on Denitrification

Yang

Wang

et al. 2023

Processes

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Cement production is the third largest source of nitrogen oxides (NOx), an air pollutant that poses a serious threat to the natural environment and human health. Reducing NOx emissions from cement production has become an urgent issue. This paper aims to explore and investigate more efficient denitrification processes to be applied in NOx reduction from precalciner. In this study, firstly, the flow field, temperature field, and component fraction in the precalciner are studied and analyzed using numerical simulation methods. Based on this, the influence of the reductant injection height and amount on the SNCR was studied by simulating the selective non-catalytic reduction (SNCR) process in the precalciner. The effect of natural gas on the NOx emissions from the precalciner was also investigated. The simulation results showed that, with the increase in height, the NOx concentration in the precalciner decreased, then increased, then decreased, and then increased again. The final NOx concentration at the exit position was 531.33 ppm. In the SNCR denitrification process, the reductant should be injected in the area where the precalciner height is 26–30 m so that the reductant can fully react with NOx and avoid the increase of ammonia escape. The NSR represents the ratio of reductant to NOx, and the results show that the larger the NSR is, the higher the denitrification rate is. However, as the NSR approaches 2, the denitrification rate slows down and the ammonia escape starts to increase. Therefore, according to the simulation results, the NSR should be kept between 1 and 1.6. The denitrification rate reached the maximum value of 42.62% at the optimal condition of 26 m of reductant injection height and 1.6 of NSR. Co-firing of natural gas with pulverized coal can effectively reduce the NOx generation in the furnace. The denitrification rate reached the maximum value of 32.15% when the natural gas injection amount was 10%. The simulation results of natural gas co-combustion and SNCR combined denitrification showed that combined denitrification was better than natural gas co-combustion or SNCR denitrification. Under the condition of NSR of 1 and natural gas injection of 10%, the denitrification rate increased by 29.83% and 31.64% compared to SNCR-only or co-combustion-only denitrification, reaching 61.98%, respectively. Moreover, less reductant is used in co-denitrification, so the problem of excessive ammonia emissions can be avoided. The results of this study provide useful guidance for denitrification process development and NOx reduction in cement production.

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“…As a result, waste plastics such as polyolefins, which release a large amount of hydrocarbon gas during devolatilization, may hold a potential as reburning fuels. While a comprehensive understanding of the reburning performance and kinetics of waste plastics is still lacking, a recent laboratory study by Oluwoye et al has demonstrated an NO x removal efficiency of up to 82 % through the reburning of recycled polyethylene (PE) [11].…”

Section: Introductionmentioning

confidence: 99%

Plastics as a Reburning Fuel: Pyrolysis at Reburning Temperatures and No-Reburning by Simulated Pyrolysis Gas

Du,

Solène,

Glarborg

et al. 2023

Preprint

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Controlling NOx emission from boilers using waste polyethylene as reburning fuel

Cited by 19 publications

References 62 publications

Research on boiler test and combustion optimization control after low-nitrogen burner transformation

Research on boiler test and combustion optimization control after low-nitrogen burner transformation

Numerical Simulation of Selective Non-Catalytic Reduction Denitrification Process in Precalciner and the Effect of Natural Gas Injection on Denitrification

Plastics as a Reburning Fuel: Pyrolysis at Reburning Temperatures and No-Reburning by Simulated Pyrolysis Gas

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