Abstract
Gas injection in the flue gas entrance of the cyclone as a means of reducing nitrous oxide (N{sub 2}O) emissions from circulating fluidized-bed (CFB) boilers was investigated in full-scale experiments. The investigation was conducted at the 12 MW CFB boiler at Chalmers University of Technology, with Liquified Petroleum Gas (LPG) as injection fuel. Reduction ratios of about 90% were reached at injection fuel ratios (i.e. energy in injection fuel divided by energy in primary fuel) of 12%, provided that the excess-air ratio from the bed corresponded to an oxygen concentration of O{sub 2}<3.5%. For O{sub 2} = 5% about 60% reduction was achieved at 12% injection fuel ratio. The N{sub 2}O emission approaches zero as gas injection causes the cyclone outlet temperature to reach 950-1000 deg. C, depending on the excess-air ratio. No negative impact on NO emissions was found. Instead, the NO emission decreased slightly with higher injection fuel ratios. CO emissions decreased significantly with higher injection fuel ratio, provided that additional air was introduced after the gas injection in cases with low excess-air. Under normal operating conditions, gas injection did not influence desulphurization negatively. At high bed temperature combined with a high injection fuel ratio, somewhat increasing SO{sub
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Citation Formats
Gustavsson, L, and Leckner, B.
Reduction of N{sub 2}O from combustion in circulating fluidized beds with afterburning of gas.
Denmark: N. p.,
1992.
Web.
Gustavsson, L, & Leckner, B.
Reduction of N{sub 2}O from combustion in circulating fluidized beds with afterburning of gas.
Denmark.
Gustavsson, L, and Leckner, B.
1992.
"Reduction of N{sub 2}O from combustion in circulating fluidized beds with afterburning of gas."
Denmark.
@misc{etde_10121250,
title = {Reduction of N{sub 2}O from combustion in circulating fluidized beds with afterburning of gas}
author = {Gustavsson, L, and Leckner, B}
abstractNote = {Gas injection in the flue gas entrance of the cyclone as a means of reducing nitrous oxide (N{sub 2}O) emissions from circulating fluidized-bed (CFB) boilers was investigated in full-scale experiments. The investigation was conducted at the 12 MW CFB boiler at Chalmers University of Technology, with Liquified Petroleum Gas (LPG) as injection fuel. Reduction ratios of about 90% were reached at injection fuel ratios (i.e. energy in injection fuel divided by energy in primary fuel) of 12%, provided that the excess-air ratio from the bed corresponded to an oxygen concentration of O{sub 2}<3.5%. For O{sub 2} = 5% about 60% reduction was achieved at 12% injection fuel ratio. The N{sub 2}O emission approaches zero as gas injection causes the cyclone outlet temperature to reach 950-1000 deg. C, depending on the excess-air ratio. No negative impact on NO emissions was found. Instead, the NO emission decreased slightly with higher injection fuel ratios. CO emissions decreased significantly with higher injection fuel ratio, provided that additional air was introduced after the gas injection in cases with low excess-air. Under normal operating conditions, gas injection did not influence desulphurization negatively. At high bed temperature combined with a high injection fuel ratio, somewhat increasing SO{sub 2} emissions were recorded. (au) (15 refs.).}
place = {Denmark}
year = {1992}
month = {Nov}
}
title = {Reduction of N{sub 2}O from combustion in circulating fluidized beds with afterburning of gas}
author = {Gustavsson, L, and Leckner, B}
abstractNote = {Gas injection in the flue gas entrance of the cyclone as a means of reducing nitrous oxide (N{sub 2}O) emissions from circulating fluidized-bed (CFB) boilers was investigated in full-scale experiments. The investigation was conducted at the 12 MW CFB boiler at Chalmers University of Technology, with Liquified Petroleum Gas (LPG) as injection fuel. Reduction ratios of about 90% were reached at injection fuel ratios (i.e. energy in injection fuel divided by energy in primary fuel) of 12%, provided that the excess-air ratio from the bed corresponded to an oxygen concentration of O{sub 2}<3.5%. For O{sub 2} = 5% about 60% reduction was achieved at 12% injection fuel ratio. The N{sub 2}O emission approaches zero as gas injection causes the cyclone outlet temperature to reach 950-1000 deg. C, depending on the excess-air ratio. No negative impact on NO emissions was found. Instead, the NO emission decreased slightly with higher injection fuel ratios. CO emissions decreased significantly with higher injection fuel ratio, provided that additional air was introduced after the gas injection in cases with low excess-air. Under normal operating conditions, gas injection did not influence desulphurization negatively. At high bed temperature combined with a high injection fuel ratio, somewhat increasing SO{sub 2} emissions were recorded. (au) (15 refs.).}
place = {Denmark}
year = {1992}
month = {Nov}
}