【Daily Question】What are the factors that affect the ash fusion point? (Participation +2, Correct answer +5 wealth)
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This post was last edited by Yamei on 2020-6-7 at 13:41. The main factors affecting the ash fusion temperature are as follows: (1) Composition factors – The components that make up the ash and the proportions of these components have a significant impact on the ash fusion temperature. The general rule is that when the content of components with high melting points (such as SiO and ALO) is high, the ash melting point is also high ； Components with low melting points (such as high contents of CaO, FeO, and MgO) result in a low ash melting point. …）（1）Medium factors: The melting point decreases when ash is in an atmosphere containing reducing gases (CO, H, CH…). This is mainly because reducing gases can take away the oxygen from the high-valent oxides in the ash, converting them into low-valent oxides and thereby lowering the melting point. Therefore, when a boiler experiences incomplete combustion due to a lack of oxygen, the likelihood of slag formation increases. (2) Concentration factor: A high ash content leads to more opportunities for contact and collision, thereby enhancing the fluxing effect and reducing the melting point. Therefore, when boilers burn coal with high ash content, the likelihood of slag formation increases.
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The main factors affecting the ash fusion temperature are as follows: (1) Composition factors – The components of the ash and the proportions of these components have a significant impact on the ash fusion temperature. The general rule is that when the content of components with high melting points (such as SiO and ALO) is high, the ash melting point is also high ； Components with low melting points (such as high contents of CaO, FeO, and MgO result in a low ash melting point). (2) Medium factors: The melting point decreases when the ash is in an atmosphere containing reducing gases (CO, H2, CH4, etc.). This is mainly because reducing gases can take away the oxygen from the high-valent oxides in the ash, converting them into low-valent oxides and thereby lowering the melting point. Therefore, when a boiler experiences incomplete combustion due to a lack of oxygen, the likelihood of slag formation increases. (3) Concentration factor: A high ash content leads to more opportunities for contact and collision, enhancing the fluxing effect and thereby reducing the melting point. Therefore, when boilers burn coal with high ash content, the likelihood of slag formation increases.
The main factors affecting the ash fusion temperature are as follows: (1) Composition factors – The components of the ash and the proportions of these components have a significant impact on the ash fusion temperature. The general rule is that when the content of components with high melting points (such as SiO and ALO) is high, the ash melting point is also high ； Components with low melting points (such as high contents of CaO, FeO, and MgO) result in a low ash melting point. …) (1) Medium factor: The melting point decreases when ash is in an atmosphere containing reducing gases (CO, H, CH…). This is mainly because reducing gases can take away the oxygen from the high-valent oxides in the ash, converting them into low-valent oxides and thereby lowering the melting point. Therefore, when a boiler experiences incomplete combustion due to a lack of oxygen, the likelihood of slag formation increases. (2) Concentration factor: A high ash content leads to more opportunities for contact and collision, thereby enhancing the fluxing effect and reducing the melting point. Therefore, when boilers burn coal with high ash content, the likelihood of slag formation increases.