Abstract
In the Circulating Fluidized Bed (CFB) combustion the sulfur removal is carried out by adding limestone (CaCO{sub 3}) directly into the combustion chamber. The limestone is calcined to lime (CaO) in the hot zone of the combustion chamber and react with sulfur dioxide (SO{sub 2}) to form calcium sulfate (CaSO{sub 4}). The limestone consumption is affected by the sulphur content of fuel, the limestone reactivity and naturally the desired SO{sub 2} emission level. In practice part of the CaO remains unreacted in the combustion chamber and exits it with the flue gas flow through the cyclone. Ahlstroem Pyropower has foreseen the expected amendments of the SO{sub 2} emission regulations and developed a method where unreacted CaO from the CFB is utilized to capture the rest of the sulfur in flue gas. Calcium oxide is activated in the activation reactor by spraying water into the flue gas, when lime particles become moist and calcium hydroxide (Ca(OH)2) is formed. The ionic reactions with SO{sub 2} and Ca(OH){sub 2} are efficient. SO{sub 2} retention in the activation reactor depends on the amount of free lime in the flue gas input. CaO{sub free}/SO{sub 2} molar ratio is used to indicate the free lime amount.
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Citation Formats
Kuivalainen, R, and Peltola, K.
The intensify of SO{sub 2}-absorption in CFB combustion by the activation reactor; SO{sub 2}-absorption tehostaminen aktivointireaktorissa kivihiilen kiertoleijupoltossa.
Finland: N. p.,
1992.
Web.
Kuivalainen, R, & Peltola, K.
The intensify of SO{sub 2}-absorption in CFB combustion by the activation reactor; SO{sub 2}-absorption tehostaminen aktivointireaktorissa kivihiilen kiertoleijupoltossa.
Finland.
Kuivalainen, R, and Peltola, K.
1992.
"The intensify of SO{sub 2}-absorption in CFB combustion by the activation reactor; SO{sub 2}-absorption tehostaminen aktivointireaktorissa kivihiilen kiertoleijupoltossa."
Finland.
@misc{etde_10140362,
title = {The intensify of SO{sub 2}-absorption in CFB combustion by the activation reactor; SO{sub 2}-absorption tehostaminen aktivointireaktorissa kivihiilen kiertoleijupoltossa}
author = {Kuivalainen, R, and Peltola, K}
abstractNote = {In the Circulating Fluidized Bed (CFB) combustion the sulfur removal is carried out by adding limestone (CaCO{sub 3}) directly into the combustion chamber. The limestone is calcined to lime (CaO) in the hot zone of the combustion chamber and react with sulfur dioxide (SO{sub 2}) to form calcium sulfate (CaSO{sub 4}). The limestone consumption is affected by the sulphur content of fuel, the limestone reactivity and naturally the desired SO{sub 2} emission level. In practice part of the CaO remains unreacted in the combustion chamber and exits it with the flue gas flow through the cyclone. Ahlstroem Pyropower has foreseen the expected amendments of the SO{sub 2} emission regulations and developed a method where unreacted CaO from the CFB is utilized to capture the rest of the sulfur in flue gas. Calcium oxide is activated in the activation reactor by spraying water into the flue gas, when lime particles become moist and calcium hydroxide (Ca(OH)2) is formed. The ionic reactions with SO{sub 2} and Ca(OH){sub 2} are efficient. SO{sub 2} retention in the activation reactor depends on the amount of free lime in the flue gas input. CaO{sub free}/SO{sub 2} molar ratio is used to indicate the free lime amount. This study was designed to evaluate the effect of the sulfur content of fuel (high sulfur coals) and the effect of the limestone reactivity on the function of the activation reactor. Two limestones of different mineral compositions, crystalline and porous, were used. The long term tests on construct materials were made in the second part of the project. Especially five filter materials were tested in 2000 hours` tests. During the operation, an alkaline ash layer, the pH of which was 10, was formed on the filter bags. All filter materials were in acceptable condition after the tests. Generally the pulse cleaning cycle varied between 1.5 and 3 hours.}
place = {Finland}
year = {1992}
month = {Dec}
}
title = {The intensify of SO{sub 2}-absorption in CFB combustion by the activation reactor; SO{sub 2}-absorption tehostaminen aktivointireaktorissa kivihiilen kiertoleijupoltossa}
author = {Kuivalainen, R, and Peltola, K}
abstractNote = {In the Circulating Fluidized Bed (CFB) combustion the sulfur removal is carried out by adding limestone (CaCO{sub 3}) directly into the combustion chamber. The limestone is calcined to lime (CaO) in the hot zone of the combustion chamber and react with sulfur dioxide (SO{sub 2}) to form calcium sulfate (CaSO{sub 4}). The limestone consumption is affected by the sulphur content of fuel, the limestone reactivity and naturally the desired SO{sub 2} emission level. In practice part of the CaO remains unreacted in the combustion chamber and exits it with the flue gas flow through the cyclone. Ahlstroem Pyropower has foreseen the expected amendments of the SO{sub 2} emission regulations and developed a method where unreacted CaO from the CFB is utilized to capture the rest of the sulfur in flue gas. Calcium oxide is activated in the activation reactor by spraying water into the flue gas, when lime particles become moist and calcium hydroxide (Ca(OH)2) is formed. The ionic reactions with SO{sub 2} and Ca(OH){sub 2} are efficient. SO{sub 2} retention in the activation reactor depends on the amount of free lime in the flue gas input. CaO{sub free}/SO{sub 2} molar ratio is used to indicate the free lime amount. This study was designed to evaluate the effect of the sulfur content of fuel (high sulfur coals) and the effect of the limestone reactivity on the function of the activation reactor. Two limestones of different mineral compositions, crystalline and porous, were used. The long term tests on construct materials were made in the second part of the project. Especially five filter materials were tested in 2000 hours` tests. During the operation, an alkaline ash layer, the pH of which was 10, was formed on the filter bags. All filter materials were in acceptable condition after the tests. Generally the pulse cleaning cycle varied between 1.5 and 3 hours.}
place = {Finland}
year = {1992}
month = {Dec}
}