N2O emission under fluidized bed combustion condition

Shen, Boxiong; Mi, T.; Liu, D.C; Feng, Bo; Yao, Qiang; Winter, Franz

doi:10.1016/s0378-3820(02)00104-2

Cited by 52 publications

(43 citation statements)

References 13 publications

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“…Crelling et al (1993) concluded that variations both in lithotype and maceral composition gave rise to large variations in nitrogen content, char morphology and reactivity, i.e., that although the nitrogen content decreased in the order: vitrinite N semifusinite N inertinite, the conversion of the coal and char nitrogen to NO showed the reverse order: fusinite N semifusinite N vitrinite. Other authors also concluded that there could be other factors related to the structure and properties of the coal, in addition to the combustion conditions, such as rank and the degree of surface oxidation (Shimizu et al, 1992;Gavin and Dorrington, 1993;Pels et al, 1993), maceral composition (Gonzáles de Andrés and Wang et al, 1994), mineral matter (Zhao et al, 2003), char reactivity, and surface area (Kilpinen et al, 2002;Shen et al, 2003;Zhao et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

Combustion studies in a fluidised bed—The link between temperature, NOx and N2O formation, char morphology and coal type

Valentim

Sousa

Abelha

et al. 2006

International Journal of Coal Geology

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Five commercially available high volatile bituminous coals from different origins were studied with the objective of characterizing their petrographic nature with respect to emissions of NO x and N 2 O. The chars produced [at temperatures ranging from 700 to 1000°C] from these coals were also petrographically analyzed to assess the contribution of char to NO x and N 2 O formation during combustion.Vitrinite-rich coals produced higher porous chars (cenospheres and tenuinetworks) than those that are rich in inertinite. The former coals were, however, found to release lower concentrations of NO.Consistent with previous works, N 2 O emissions were observed to decrease significantly with temperature, however, on the whole, the N 2 O emissions from vitrinite-rich high volatile coals were less than those from inertinite-rich coals. Additionally, high porous chars were found to give rise to lower emissions of NO and N 2 O.

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Section: Discussionmentioning

confidence: 99%

Combustion studies in a fluidised bed—The link between temperature, NOx and N2O formation, char morphology and coal type

Valentim

Sousa

Abelha

et al. 2006

International Journal of Coal Geology

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“…It was found that SO2 emission was reduced linearly with the increase in biomass co-firing ratio; however, NO reduction percentage was less, and NO emission could be very high at a high air ratio. Shen et al (2003) investigated the effect of temperature and blending ratio on NOx emission in a laboratory-scale bubbling fluidized bed, indicating that co-combustion of biomass and coal was effective in lowering NOx emission. Lawrence et al (2009) reported a lower NOx emission when dairy biomass (DB) was co-fired with coal in a 29 kW furnace, even though DB fuels are higher in moisture, nitrogen, sulfur, and ash.…”

Section: Introductionmentioning

confidence: 99%

NO Emissions and Combustion Efficiency during Biomass Co-firing and Air-staging

Wang¹,

Wang²,

Hu³

et al. 2015

BioResources

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Experiments were carried out in a drop tube furnace to investigate the effects of biomass/coal co-firing and air staging on NO emission and combustion efficiency. NO and CO emissions along the height of the furnace were monitored by a gas analyzer, and the content of unburned carbon (UBC) in fly ash was also tested. Results showed that NO emission from straw or wood combustion only account for 1/3 or 1/2 that from coal combustion, respectively. Under the conditions of biomass co-firing, the increase in blending ratio had a positive effect on the reduction of NO emission and combustion efficiency. Moreover, results of air-staging combustion showed that for coal combustion, air staging notably reduced NO emission and combustion efficiency. For biomass combustion, the effect was slight. Synergetic analysis indicated that there was an optimum biomass co-firing ratio around 0.4, when the positive synergetic effects on reducing NO emission and UBC were the most significant. When the cofiring ratio exceeded this optimum value, further increasing the co-firing ratio had little influence on NO emission and combustion efficiency. After air staging was adopted, the degree of synergetic effect on NO emissions was reduced while that of UBC was increased.

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“…Heterogenous N 2 O decomposition in CFB boilers indicates that heterogenous reactions must happen between N 2 O and some components in solid fuels, ashes or catalysts [4,5]. In CFB power plants the ash consists of various sorts of oxides, such as SiO 2 , Al 2 O 3 , Fe 2 O 3 and CaO.…”

Section: Open Accessmentioning

confidence: 99%

“…Shen et al analyzed the promoting effect of char on N 2 O decomposition in the temperature range of 677-977 °C [4], and the results showed that N 2 O conversion rate was about 90% under the circumstance with the temperature 900 °C comparing with 60% in bare bed. Meanwhile, the authors analyzed the promoting effect of oxide and sulphate on N 2 O decomposition in the temperature range of 677-977 °C, and it was found that the sequence of levels of the promoting effect was: Fe 2 O 3 > CaSO 4 > Al 2 O 3 > SiO 2 > MgSO 4 > MgO > bare bed, with the conversion of N 2 O being 99%, 91%, 81%, 69%, 59%, 47% and 39%, respectively [4].…”

Section: Open Accessmentioning

confidence: 99%

“…Meanwhile, the authors analyzed the promoting effect of oxide and sulphate on N 2 O decomposition in the temperature range of 677-977 °C, and it was found that the sequence of levels of the promoting effect was: Fe 2 O 3 > CaSO 4 > Al 2 O 3 > SiO 2 > MgSO 4 > MgO > bare bed, with the conversion of N 2 O being 99%, 91%, 81%, 69%, 59%, 47% and 39%, respectively [4]. With respect to the catalytic effect of these oxides, the most important reaction of N 2 O was denoted as decomposition reaction, described as 2N 2 …”

Section: Open Accessmentioning

confidence: 99%

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Experimental Research on Heterogeneous N2O Decomposition with Ash and Biomass Gasification Gas

Zhang

Yang

et al. 2011

Energies

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Abstract:In this paper, the promoting effects of ash and biomass gas reburning on N 2 O decomposition were investigated based on a fluidized bed reactor, with the assessment of the influence of O 2 on N 2 O decomposition with circulating ashes. Experimental results show that different metal oxides contained in ash play distinct roles in the process of N 2 O decomposition with biomass gas reburning. Compared with other components in ash, CaO is proven to be very active and has the greatest promoting impact on N 2 O decomposition. It is also found that O 2 , even in small amounts, can weaken the promoting effect of ash on N 2 O decomposition by using biomass gas reburning.

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N2O emission under fluidized bed combustion condition

Cited by 52 publications

References 13 publications

Combustion studies in a fluidised bed—The link between temperature, NOx and N2O formation, char morphology and coal type

Combustion studies in a fluidised bed—The link between temperature, NOx and N2O formation, char morphology and coal type

NO Emissions and Combustion Efficiency during Biomass Co-firing and Air-staging

Experimental Research on Heterogeneous N2O Decomposition with Ash and Biomass Gasification Gas

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