Pilot-scale investigation of the influence of coal-biomass cofiring on ash deposition. Robinson, A., L., Junker, H., & Baxter, L., L. Energy Fuels, 16:343-355, 2002. abstract bibtex Cofiring biomass with coal is a promising short-term
option for reducing the net CO2 emissions from existing coal-fired
power plants. This paper examines the effects of cofiring biomass
and coal on ash deposition under conditions representative of those
found in the superheater region of pulverized-coal boilers.
Experiments were conducted with blends of eight different
fuels-three types of bituminous coal, sub-bituminous coal, two
types of straw, switchgrass, and wood. For each fuel, reference
tests of unblended fuel establish a baseline against which to
compare the results from the cofiring tests. The deposition rates
for the cofire blends are between the measured deposition rates of
the unblended fuels. Therefore, blending straw with coal reduces
the high deposition rates observed while firing unblended straw,
and cofiring coal with wood results in slightly lower deposition
rates than those that occur while firing unblended coal. The
primary interaction between the biomass and coal during cofiring is
the reaction of the sulfur from the coal with the alkali species
from the biomass. This sulfation reduces the stickiness of the
deposit, which substantially reduces the deposition rate of the
coal-straw blends in comparison to expectations based on the
performance of the unblended fuels. Sulfation also reduces the
chlorine content of the deposits, potentially reducing the
corrosion potential of the deposits. A scaling parameter is
proposed to estimate the deposit chlorine content on the basis of
the properties of the cofire blend; the ratio of fuel-S to
available alkali must be in excess of 5 times the S-to-alkali
stoichiometric ratio to eliminate chlorine from the deposit. The
results demonstrate that cofiring can mitigate some of the fouling
difficulties associated with combustion of high-fouling biofuels.
C1 Sandia Natl Labs, Combust Res Facil, Livermore, CA 94550 USA.
@article{
title = {Pilot-scale investigation of the influence of coal-biomass cofiring on ash deposition},
type = {article},
year = {2002},
pages = {343-355},
volume = {16},
id = {64582a65-e442-3e31-96e5-f19d8b3cd0fb},
created = {2014-10-08T16:28:18.000Z},
file_attached = {false},
profile_id = {363623ef-1990-38f1-b354-f5cdaa6548b2},
group_id = {02267cec-5558-3876-9cfc-78d056bad5b9},
last_modified = {2017-03-14T17:32:24.802Z},
read = {false},
starred = {false},
authored = {false},
confirmed = {true},
hidden = {false},
citation_key = {Robinson:EF:2002a},
source_type = {article},
private_publication = {false},
abstract = {Cofiring biomass with coal is a promising short-term
option for reducing the net CO2 emissions from existing coal-fired
power plants. This paper examines the effects of cofiring biomass
and coal on ash deposition under conditions representative of those
found in the superheater region of pulverized-coal boilers.
Experiments were conducted with blends of eight different
fuels-three types of bituminous coal, sub-bituminous coal, two
types of straw, switchgrass, and wood. For each fuel, reference
tests of unblended fuel establish a baseline against which to
compare the results from the cofiring tests. The deposition rates
for the cofire blends are between the measured deposition rates of
the unblended fuels. Therefore, blending straw with coal reduces
the high deposition rates observed while firing unblended straw,
and cofiring coal with wood results in slightly lower deposition
rates than those that occur while firing unblended coal. The
primary interaction between the biomass and coal during cofiring is
the reaction of the sulfur from the coal with the alkali species
from the biomass. This sulfation reduces the stickiness of the
deposit, which substantially reduces the deposition rate of the
coal-straw blends in comparison to expectations based on the
performance of the unblended fuels. Sulfation also reduces the
chlorine content of the deposits, potentially reducing the
corrosion potential of the deposits. A scaling parameter is
proposed to estimate the deposit chlorine content on the basis of
the properties of the cofire blend; the ratio of fuel-S to
available alkali must be in excess of 5 times the S-to-alkali
stoichiometric ratio to eliminate chlorine from the deposit. The
results demonstrate that cofiring can mitigate some of the fouling
difficulties associated with combustion of high-fouling biofuels.
C1 Sandia Natl Labs, Combust Res Facil, Livermore, CA 94550 USA.},
bibtype = {article},
author = {Robinson, A L and Junker, H and Baxter, L L},
journal = {Energy Fuels}
}
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This paper examines the effects of cofiring biomass\nand coal on ash deposition under conditions representative of those\nfound in the superheater region of pulverized-coal boilers.\nExperiments were conducted with blends of eight different\nfuels-three types of bituminous coal, sub-bituminous coal, two\ntypes of straw, switchgrass, and wood. For each fuel, reference\ntests of unblended fuel establish a baseline against which to\ncompare the results from the cofiring tests. The deposition rates\nfor the cofire blends are between the measured deposition rates of\nthe unblended fuels. Therefore, blending straw with coal reduces\nthe high deposition rates observed while firing unblended straw,\nand cofiring coal with wood results in slightly lower deposition\nrates than those that occur while firing unblended coal. The\nprimary interaction between the biomass and coal during cofiring is\nthe reaction of the sulfur from the coal with the alkali species\nfrom the biomass. This sulfation reduces the stickiness of the\ndeposit, which substantially reduces the deposition rate of the\ncoal-straw blends in comparison to expectations based on the\nperformance of the unblended fuels. Sulfation also reduces the\nchlorine content of the deposits, potentially reducing the\ncorrosion potential of the deposits. A scaling parameter is\nproposed to estimate the deposit chlorine content on the basis of\nthe properties of the cofire blend; the ratio of fuel-S to\navailable alkali must be in excess of 5 times the S-to-alkali\nstoichiometric ratio to eliminate chlorine from the deposit. The\nresults demonstrate that cofiring can mitigate some of the fouling\ndifficulties associated with combustion of high-fouling biofuels.\nC1 Sandia Natl Labs, Combust Res Facil, Livermore, CA 94550 USA.","bibtype":"article","author":"Robinson, A L and Junker, H and Baxter, L L","journal":"Energy Fuels","bibtex":"@article{\n title = {Pilot-scale investigation of the influence of coal-biomass cofiring on ash deposition},\n type = {article},\n year = {2002},\n pages = {343-355},\n volume = {16},\n id = {64582a65-e442-3e31-96e5-f19d8b3cd0fb},\n created = {2014-10-08T16:28:18.000Z},\n file_attached = {false},\n profile_id = {363623ef-1990-38f1-b354-f5cdaa6548b2},\n group_id = {02267cec-5558-3876-9cfc-78d056bad5b9},\n last_modified = {2017-03-14T17:32:24.802Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Robinson:EF:2002a},\n source_type = {article},\n private_publication = {false},\n abstract = {Cofiring biomass with coal is a promising short-term\noption for reducing the net CO2 emissions from existing coal-fired\npower plants. This paper examines the effects of cofiring biomass\nand coal on ash deposition under conditions representative of those\nfound in the superheater region of pulverized-coal boilers.\nExperiments were conducted with blends of eight different\nfuels-three types of bituminous coal, sub-bituminous coal, two\ntypes of straw, switchgrass, and wood. For each fuel, reference\ntests of unblended fuel establish a baseline against which to\ncompare the results from the cofiring tests. The deposition rates\nfor the cofire blends are between the measured deposition rates of\nthe unblended fuels. Therefore, blending straw with coal reduces\nthe high deposition rates observed while firing unblended straw,\nand cofiring coal with wood results in slightly lower deposition\nrates than those that occur while firing unblended coal. The\nprimary interaction between the biomass and coal during cofiring is\nthe reaction of the sulfur from the coal with the alkali species\nfrom the biomass. This sulfation reduces the stickiness of the\ndeposit, which substantially reduces the deposition rate of the\ncoal-straw blends in comparison to expectations based on the\nperformance of the unblended fuels. Sulfation also reduces the\nchlorine content of the deposits, potentially reducing the\ncorrosion potential of the deposits. A scaling parameter is\nproposed to estimate the deposit chlorine content on the basis of\nthe properties of the cofire blend; the ratio of fuel-S to\navailable alkali must be in excess of 5 times the S-to-alkali\nstoichiometric ratio to eliminate chlorine from the deposit. The\nresults demonstrate that cofiring can mitigate some of the fouling\ndifficulties associated with combustion of high-fouling biofuels.\nC1 Sandia Natl Labs, Combust Res Facil, Livermore, CA 94550 USA.},\n bibtype = {article},\n author = {Robinson, A L and Junker, H and Baxter, L L},\n journal = {Energy Fuels}\n}","author_short":["Robinson, A., L.","Junker, H.","Baxter, L., L."],"bibbaseid":"robinson-junker-baxter-pilotscaleinvestigationoftheinfluenceofcoalbiomasscofiringonashdeposition-2002","role":"author","urls":{},"downloads":0},"bibtype":"article","biburl":null,"creationDate":"2014-09-11T15:28:59.275Z","downloads":0,"keywords":[],"search_terms":["pilot","scale","investigation","influence","coal","biomass","cofiring","ash","deposition","robinson","junker","baxter"],"title":"Pilot-scale investigation of the influence of coal-biomass cofiring on ash deposition","year":2002}