Alkali/chloride release during refuse incineration on a grate: Full-scale experimental findings

Publication: Research - peer-reviewJournal article – Annual report year: 2008

Standard

Harvard

APA

CBE

MLA

Vancouver

Author

Bibtex

@article{ce9050011f934867811ae049afe98fde,
title = "Alkali/chloride release during refuse incineration on a grate: Full-scale experimental findings",
keywords = "corrosion, chlorine, waste, grate, incineration, boiler, alkali, volatilisation",
publisher = "Elsevier BV",
author = "Martin Bøjer and Jensen, {Peter Arendt} and Flemming Frandsen and Kim Dam-Johansen and Madsen, {Ole Hedegaard} and Kasper Lundtorp",
year = "2008",
doi = "10.1016/j.fuproc.2007.10.003",
volume = "89",
number = "5",
pages = "528--539",
journal = "Fuel Processing Technology",
issn = "0378-3820",

}

RIS

TY - JOUR

T1 - Alkali/chloride release during refuse incineration on a grate: Full-scale experimental findings

A1 - Bøjer,Martin

A1 - Jensen,Peter Arendt

A1 - Frandsen,Flemming

A1 - Dam-Johansen,Kim

A1 - Madsen,Ole Hedegaard

A1 - Lundtorp,Kasper

AU - Bøjer,Martin

AU - Jensen,Peter Arendt

AU - Frandsen,Flemming

AU - Dam-Johansen,Kim

AU - Madsen,Ole Hedegaard

AU - Lundtorp,Kasper

PB - Elsevier BV

PY - 2008

Y1 - 2008

N2 - Waste to energy (WtE) plants are utilised for the production of heat and electricity. However, due to corrosion at super heater surfaces a relatively low 25% of the waste lower heating value can with the present technology be converted to electricity. High contents of Cl, Na, K, Zn, Pb and S in waste cause relatively high super heater corrosion rates. The Cl-content in waste is one of the key-factors for volatilisation of alkali and heavy metals in WtE plants. Little is known about the release of Cl, Na, K, Zn, Pb, and S along grate of waste incineration plants. The 26 t h(-1) WtE plant Vestforbraending unit S in Denmark was used for measurements of temperature, gas-concentration (O-2/CO/CO2), and sampling of gas phase Cl, Na, K, Pb, Zn, and S. Unit 5 has 6 ports distributed along the 13 in long grate between 1.5-1.8 in above the grate. Five of these ports were used for measurements. Two aqueous absorption systems containing a solution of NH3 or a solution of H2O2/HNO3 were used to collect the gaseous samples. Tar was found to condense in the sampling system at the ports near the fuel inlet. The experiments showed the majority of Cl, Na, and K to be volatilised during the early stages of combustion. The maximum release of Cl, Na, and K was measured in port 2 as 177 ppm(nu), 71 ppm(nu) and 44 ppm(nu) respectively. The maximum average gas temperature of 1140 was measured in port 3 compared to the temperatures at ports 2 and 4 of 816 and 551 respectively. It has been suggested to use flue gas from the area of the grate near port 3 with a high temperature, that contains relatively low amounts of corrosive elements, and lead to a separate high temperature super heater and thus increase the electrical efficiency.

AB - Waste to energy (WtE) plants are utilised for the production of heat and electricity. However, due to corrosion at super heater surfaces a relatively low 25% of the waste lower heating value can with the present technology be converted to electricity. High contents of Cl, Na, K, Zn, Pb and S in waste cause relatively high super heater corrosion rates. The Cl-content in waste is one of the key-factors for volatilisation of alkali and heavy metals in WtE plants. Little is known about the release of Cl, Na, K, Zn, Pb, and S along grate of waste incineration plants. The 26 t h(-1) WtE plant Vestforbraending unit S in Denmark was used for measurements of temperature, gas-concentration (O-2/CO/CO2), and sampling of gas phase Cl, Na, K, Pb, Zn, and S. Unit 5 has 6 ports distributed along the 13 in long grate between 1.5-1.8 in above the grate. Five of these ports were used for measurements. Two aqueous absorption systems containing a solution of NH3 or a solution of H2O2/HNO3 were used to collect the gaseous samples. Tar was found to condense in the sampling system at the ports near the fuel inlet. The experiments showed the majority of Cl, Na, and K to be volatilised during the early stages of combustion. The maximum release of Cl, Na, and K was measured in port 2 as 177 ppm(nu), 71 ppm(nu) and 44 ppm(nu) respectively. The maximum average gas temperature of 1140 was measured in port 3 compared to the temperatures at ports 2 and 4 of 816 and 551 respectively. It has been suggested to use flue gas from the area of the grate near port 3 with a high temperature, that contains relatively low amounts of corrosive elements, and lead to a separate high temperature super heater and thus increase the electrical efficiency.

KW - corrosion

KW - chlorine

KW - waste

KW - grate

KW - incineration

KW - boiler

KW - alkali

KW - volatilisation

U2 - 10.1016/j.fuproc.2007.10.003

DO - 10.1016/j.fuproc.2007.10.003

JO - Fuel Processing Technology

JF - Fuel Processing Technology

SN - 0378-3820

IS - 5

VL - 89

SP - 528

EP - 539

ER -