Reducing N<sub>2</sub>O Emission by Co-Combustion of Coal and Biomass

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

doi:10.1021/ef010108f

Cited by 32 publications

(17 citation statements)

References 9 publications

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“…A reasonable explanation for the decrease in NO emissions after the addition of biomass has been provided by Liu et al [32] in their study on conventional co-combustion of coal and biomass. These authors believe that lower NO x emissions may occur during cocombustion than with individual coals because most of the biomass is released as volatiles (about 75% at temperatures above 800 ºC) and the fuel-N in the biomass is predominantly liberated as NH 3 which may on the one hand form NO x , but also act as a reducing agent in further reactions with NO x to form N 2 .…”

Section: No Emissionsmentioning

confidence: 69%

Oxy-fuel combustion of coal and biomass blends

Riaza

Gil

Álvarez

et al. 2012

Energy

154

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The ignition temperature, burnout and NO emissions of blends of a semi-anthracite and a high-volatile bituminous coal with 10 and 20 wt.% of olive waste were studied under oxy-fuel combustion conditions in an entrained flow reactor (EFR). The results obtained under several oxy-fuel atmospheres (21%O 2 -79%CO 2 , 30%O 2 -70% CO 2 and 35%O 2 -65%CO 2 ) were compared with those attained in air. The results indicated that replacing N 2 by CO 2 in the combustion atmosphere with 21% of O 2 caused an increase in the temperature of ignition and a decrease in the burnout value. When the O 2 concentration was increased to 30 and 35%, the temperature of ignition was lower and the burnout value was higher than in air conditions. A significant reduction in ignition temperature and a slight increase in the burnout value was observed after the addition of biomass, this trend becoming more noticeable as the biomass concentration was increased. The emissions of NO during oxy-fuel combustion were lower than under air-firing. However, they remained similar under all the oxy-fuel atmospheres with increasing O 2 concentrations. Emissions of NO were significantly reduced by the addition of biomass to the bituminous coal, although this effect was less noticeable in the case of the semianthracite.

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Section: No Emissionsmentioning

confidence: 69%

Oxy-fuel combustion of coal and biomass blends

Riaza

Gil

Álvarez

et al. 2012

Energy

154

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“…Besides these differences in nitrogen content, most of the biomass is released as volatiles (about 75% at temperatures above 800 C) and the fuel-N is predominantly liberated as NH 3 , which may be oxidized to NO but also act as a reducing agent in further reactions with NO to form N 2 . On the other hand, coals released less volatiles and the fuel-N is mainly evolved as HCN, which has a lower potential to reduce NO to N 2 ( Alvarez et al, 2014;Houshfar et al, 2012;Glarborg and Jensen, 2003;Liu et al, 2002).…”

Section: Resultsmentioning

confidence: 99%

NOx and SO2 emissions of coals, biomass and their blends under different oxy-fuel atmospheres

Moroń

Rybak

2015

Atmospheric Environment

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“…Rice husk was found to have higher nitrogen contents than coal. Hence, the drop in NO x emission as increasing amount of rice husk might be due to the effects of nascent char from the rice husk and volatile matter on the reduction of NO x [11,12]. The NO x emissions during the combustion are between 80 and 150 ppm.…”

Section: -3 No X Emissionsmentioning

confidence: 99%

Co-combustion of coal and biomass in a circulating fluidized bed combustor

Prompubess

Mekasut

Piumsomboon

et al. 2007

Korean J. Chem. Eng.

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In this research, co-combustion of coal and rice husk was studied in a circulating fluidized bed combustor (CFBC). The effects of mixed fuel ratios, primary air and secondary air flow rates on temperature and gas concentration profiles along riser (0.1 m inside diameter and 3.0 m height) were studied. The average particle size of coal from Maetah used in this work was 1,128 mm and bed material was sand. The range of primary air flow rates was 480-920 l/min corresponding to U g of 1.0-2.0 m/s for coal feed rate at 5.8 kg/h. The recirculation rate through L-valve was 100 kg/hr. It was found that the temperatures along the riser were rather steady at about 800-1,000 degrees Celsius. The introduction of secondary air improved combustion and temperature gradient at the bottom of the riser, particularly at a primary air flow rate below 1.5 m/s. Blending of coal with biomass, rice husk, did improve the combustion efficiency of coal itself even at low concentration of rice husk of 3.5 wt%. In addition, the presence of rice husk in the feed stocks reduced the emission of both NO x and SO 2 .

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Reducing N₂O Emission by Co-Combustion of Coal and Biomass

Cited by 32 publications

References 9 publications

Oxy-fuel combustion of coal and biomass blends

Oxy-fuel combustion of coal and biomass blends

NOx and SO2 emissions of coals, biomass and their blends under different oxy-fuel atmospheres

Co-combustion of coal and biomass in a circulating fluidized bed combustor

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Reducing N2O Emission by Co-Combustion of Coal and Biomass

Cited by 32 publications

References 9 publications

Oxy-fuel combustion of coal and biomass blends

Oxy-fuel combustion of coal and biomass blends

NOx and SO2 emissions of coals, biomass and their blends under different oxy-fuel atmospheres

Co-combustion of coal and biomass in a circulating fluidized bed combustor

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Reducing N₂O Emission by Co-Combustion of Coal and Biomass