Evaluation on nitrogen conversion during biomass torrefaction and its blend co-combustion with coal

Yang, Xudong; Luo, Zhongyang; Yan, Bichen; Wang, Yinchen; Yu, Cunjiang

doi:10.1016/j.biortech.2021.125309

Cited by 29 publications

(6 citation statements)

References 29 publications

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“…This limits the air available for coke burning, thereby reducing unburned coke reaching the SOFA region. , Consequently, the NO emission concentration decreases with the increased cocombustion ratio ξ across all types of biogases. The fact that the NO emission is inversely proportional to the cocombustion ratio is consistent with the findings of Yang’s work. , …”

Section: Resultssupporting

confidence: 91%

“…The fact that the NO emission is inversely proportional to the cocombustion ratio is consistent with the findings of Yang's work. 27,28 Figure 8 depicts the cross-sectional temperature distribution along the height of the boiler furnace for cocombustion ratios at ξ = 0, 0.04, and 0.1. Throughout the entire furnace, flame temperatures remain within a safe operating temperature range.…”

Section: Resultsmentioning

confidence: 99%

“…The fact that the NO emission is inversely proportional to the cocombustion ratio is consistent with the findings of Yang’s work. 27 , 28 …”

Section: Resultsmentioning

confidence: 99%

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Numerical Study on Combustion Characteristics of Biogas Cocombustion in a 300MW Coal-Fired Boiler Furnace

Shang,

Xie,

Chen

et al. 2024

ACS Omega

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To further explore cocombustion technology with biogas and coal, a series of numerical simulations have been carried out to analyze the effects of the cocombustion ratio ξ, height of biogas nozzle H GN , and tilt angle of burner θ BN on combustion characteristics in a 300 MW four-corner tangential boiler furnace. Three types of biogas are gasified from straw, sawdust, and raw wood when air serves as the gasification agent. The velocity field, temperature field, and NO emissions have been comprehensively analyzed when the values of ξ, H GN , and θ BN range, respectively, from 0.02 to 0.12, from 17.3 to 20.3 m, and from −15°to +15°. Results showed that the NO concentration at the furnace outlet monotonously decreased with ξ. The injection of biogas reduces both the peak temperature of the entire boiler furnace and the NO concentration at the furnace outlet. The NO emission concentration decreases with the increased ξ value for all types of biogases. The cocombustion with sawdust biogas indicates the least NO emission at a fixed cocombustion ratio. Furthermore, reducing the furnace height at H GN = 17.3 m or titling down the burner at θ BN = −15°contributed to a greater NO concentration at the furnace outlet.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

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Numerical Study on Combustion Characteristics of Biogas Cocombustion in a 300MW Coal-Fired Boiler Furnace

Shang,

Xie,

Chen

et al. 2024

ACS Omega

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“…XPS analysis was employed in this study to clarify the change in behavior of structural nitrogen in wheat straw particles after undergoing various torrefaction conditions. According to the specific assignment of each typical nitrogen-containing functional group, the XPS N1s spectra could be deconvoluted into four peaks (N-5, N-6, N-A and N-Q) [ 34 ]. Due to the participation of oxidizing agents in the thermal conversion process of carbonaceous materials, the microstructure and the occurrence form of typical elements was altered significantly.…”

Section: Resultsmentioning

confidence: 99%

Effects of Torrefaction Pretreatment on the Structural Features and Combustion Characteristics of Biomass-Based Fuel

Zhao

Zhang

et al. 2023

Molecules

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Wheat straw, a typical agricultural solid waste, was employed to clarify the effects of torrefaction on the structural features and combustion reactivity of biomass. Two typical torrefaction temperatures (543 K and 573 K), four atmospheres (argon, 6 vol.% O2, dry flue gas and raw flue gas) were selected. The elemental distribution, compositional variation, surface physicochemical structure and combustion reactivity of each sample were identified using elemental analysis, XPS, N2 adsorption, TGA and FOW methods. Oxidative torrefaction tended to optimize the fuel quality of biomass effectively, and the enhancement of torrefaction severity improved the fuel quality of wheat straw. The O2, CO2 and H2O in flue gas could synergistically enhance the desorption of hydrophilic structures during oxidative torrefaction process, especially at high temperatures. Meanwhile, the variations in microstructure of wheat straw promoted the conversion of N-A into edge nitrogen structures (N-5 and N-6), especially N-5, which is a precursor of HCN. Additionally, mild surface oxidation tended to promote the generation of some new oxygen-containing functionalities with high reactivity on the surface of wheat straw particles after undergoing oxidative torrefaction pretreatment. Due to the removal of hemicellulose and cellulose from wheat straw particles and the generation of new functional groups on the particle surfaces, the ignition temperature of each torrefied sample expressed an increasing tendency, while the Ea clearly decreased. According to the results obtained from this research, it could be concluded that torrefaction conducted in a raw flue gas atmosphere at 573 K would improve the fuel quality and reactivity of wheat straw most significantly.

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“…Customarily the presence of volatile chunk in the biomass is much higher when compared to that of coal. Existence of volatile matter within the biomass readily clouts their combustion demeanour (Yang et al., 2021). The range of volatile matter content of the studied biomass varied between 65%–75% which complies with the other previously established literature reports (Mohan et al., 2006).…”

Section: Resultsmentioning

confidence: 99%

Screening and characterization of waste lignocellulosic biomass as a potential substrate for energy recovery

Kumari,

Gupta

2023

Environmental Quality Mgmt

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The world is facing a severe energy crisis due to rapid industrialization, population explosion, and modern lifestyle. Conventional energy sources are running out of stock and accordingly, an ardent need for the search for alternative feedstock for energy recovery has been the research focus for the past few decades. In context to this energy turmoil, the lignocellulosic biomasses have emerged as an excellent surrogate antecedent for energy procreation in this present scenario of the energy crisis. Among numerous feasible biomass energy recovery methods, the biochemical route and the thermochemical route are the most prevailing. Accordingly, several biomass characteristics require well understanding to access the extent of possible energy recovery. The compositional features assessed (in terms of cellulose, hemicellulose, extractives, and lignin content) as well as the ultimate analysis carried out (in terms of the carbon, hydrogen, oxygen, sulfur, and nitrogen content) as one of the major parameters for evaluating the energy recovery potential and subsequently, a Van Krevelen diagram was obtained to define their energy recovery potential. The calorific value of the three biomass specimens obtained by using an adiabatic bomb calorimeter and subsequently, their oil equivalence was presented. A tariff and budgetary analysis evaluated to define their respective economic incentives and their potential scope to meet the energy crisis scenario. Finally, a scoring matrix analysis conducted parallelly by evaluating the various parameters by adopting the rank correlation method to screen out the best biomass category. The overall scheme of study adopted for screening a particular waste biomass category from three widely available agriculture waste biomass samples (rice husk, corn cob, and nutshell) through multiple criteria and thereby evaluating the most ideal biomass as the surrogate source to meet the ever‐increasing energy demand which are prevalent in the state of Jharkhand, India.

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Evaluation on nitrogen conversion during biomass torrefaction and its blend co-combustion with coal

Cited by 29 publications

References 29 publications

Numerical Study on Combustion Characteristics of Biogas Cocombustion in a 300MW Coal-Fired Boiler Furnace

Numerical Study on Combustion Characteristics of Biogas Cocombustion in a 300MW Coal-Fired Boiler Furnace

Effects of Torrefaction Pretreatment on the Structural Features and Combustion Characteristics of Biomass-Based Fuel

Screening and characterization of waste lignocellulosic biomass as a potential substrate for energy recovery

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