Abstract
The purpose of this work was to examine if phase diagrams could be of any help when evaluating the sintering risk of different biofuel ashes. In the work was also included to make some judgements about corrosion risks connected with the ashes. Important parameters for the sintering mechanisms are mineral contents and mineral composition of the biofuel but also the environment when the ash is formed. It is for instance important if it is a reducing or oxidizing atmosphere and the type of sand used in FB-boilers. The mineral contents are depending on the type of biofuel, locality of the plant, size and age of the plant and sometimes even harvest time. The most important components of wood ashes are CaO, SiO2, K2O and MgO. In the report a large number of binary and ternary phase diagrams are presented built up by components frequent in biofuel ashes. From the diagrams it is seen that it is mostly Na2O and K2O which cause low melting temperatures. A low melting temperature increase the risk for an ash to sinter. The lowest melting temperature, approximately 700 deg C, is found in the ternary phase diagram CaO-K2O-SiO2 at the composition 70% SiO2, 28% K2O
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Citation Formats
Ryding, B.
The sintering properties of biofuel ashes, estimation with help of phase diagrams; Biobraensleaskas sintringsegenskaper, bedoemning med hjaelp av tillstaandsdiagram.
Sweden: N. p.,
1991.
Web.
Ryding, B.
The sintering properties of biofuel ashes, estimation with help of phase diagrams; Biobraensleaskas sintringsegenskaper, bedoemning med hjaelp av tillstaandsdiagram.
Sweden.
Ryding, B.
1991.
"The sintering properties of biofuel ashes, estimation with help of phase diagrams; Biobraensleaskas sintringsegenskaper, bedoemning med hjaelp av tillstaandsdiagram."
Sweden.
@misc{etde_10133888,
title = {The sintering properties of biofuel ashes, estimation with help of phase diagrams; Biobraensleaskas sintringsegenskaper, bedoemning med hjaelp av tillstaandsdiagram}
author = {Ryding, B}
abstractNote = {The purpose of this work was to examine if phase diagrams could be of any help when evaluating the sintering risk of different biofuel ashes. In the work was also included to make some judgements about corrosion risks connected with the ashes. Important parameters for the sintering mechanisms are mineral contents and mineral composition of the biofuel but also the environment when the ash is formed. It is for instance important if it is a reducing or oxidizing atmosphere and the type of sand used in FB-boilers. The mineral contents are depending on the type of biofuel, locality of the plant, size and age of the plant and sometimes even harvest time. The most important components of wood ashes are CaO, SiO2, K2O and MgO. In the report a large number of binary and ternary phase diagrams are presented built up by components frequent in biofuel ashes. From the diagrams it is seen that it is mostly Na2O and K2O which cause low melting temperatures. A low melting temperature increase the risk for an ash to sinter. The lowest melting temperature, approximately 700 deg C, is found in the ternary phase diagram CaO-K2O-SiO2 at the composition 70% SiO2, 28% K2O and 2% CaO. Phase diagrams can however not alone predict if sintering will occur or not, but they can give you a good understanding of possible melting points intervals that can be of good help. Fuels from Salix and straw from cereals have lower melting points than fuels from wood. The risk for sintering will consequently increase if Salix or straw is mixed with wood fuels. The ashes from biofuels contain no or little sulphur. When thinking of corrosion this is advantageous as sulphur in other types of ashes is the dominant corrosion factor. For biofuel ashes the most critical components are instead sodium and chlorine. In general you can however say that biofuel ashes are not corrosive.}
place = {Sweden}
year = {1991}
month = {Aug}
}
title = {The sintering properties of biofuel ashes, estimation with help of phase diagrams; Biobraensleaskas sintringsegenskaper, bedoemning med hjaelp av tillstaandsdiagram}
author = {Ryding, B}
abstractNote = {The purpose of this work was to examine if phase diagrams could be of any help when evaluating the sintering risk of different biofuel ashes. In the work was also included to make some judgements about corrosion risks connected with the ashes. Important parameters for the sintering mechanisms are mineral contents and mineral composition of the biofuel but also the environment when the ash is formed. It is for instance important if it is a reducing or oxidizing atmosphere and the type of sand used in FB-boilers. The mineral contents are depending on the type of biofuel, locality of the plant, size and age of the plant and sometimes even harvest time. The most important components of wood ashes are CaO, SiO2, K2O and MgO. In the report a large number of binary and ternary phase diagrams are presented built up by components frequent in biofuel ashes. From the diagrams it is seen that it is mostly Na2O and K2O which cause low melting temperatures. A low melting temperature increase the risk for an ash to sinter. The lowest melting temperature, approximately 700 deg C, is found in the ternary phase diagram CaO-K2O-SiO2 at the composition 70% SiO2, 28% K2O and 2% CaO. Phase diagrams can however not alone predict if sintering will occur or not, but they can give you a good understanding of possible melting points intervals that can be of good help. Fuels from Salix and straw from cereals have lower melting points than fuels from wood. The risk for sintering will consequently increase if Salix or straw is mixed with wood fuels. The ashes from biofuels contain no or little sulphur. When thinking of corrosion this is advantageous as sulphur in other types of ashes is the dominant corrosion factor. For biofuel ashes the most critical components are instead sodium and chlorine. In general you can however say that biofuel ashes are not corrosive.}
place = {Sweden}
year = {1991}
month = {Aug}
}