Method for increasing smelting point of coal ash

Abstract

Provided is a process for increasing the fusing point of coal ash, which is characterized in that low-melting-point coal acts as raw material and is blended with addition agent to realize the process. The content of the low-melting-point coal as the raw material is 85 percent to 95 percent, the content of sulfur S is controlled no more than 1 percent, and the content of the blended addition agent is 6 percent to 13 percent. The addition agent can be ganister sand, porcelain clay or kaolin. The process of increasing the fusing point of the coal ash which is introduced by the invention not only is simple and practical, but also can enable the fusing point of coal ash to be increased to proper value through regulating the content of the blended addition agent, which meets the application of fire coal in industry or in daily life.

Description

[technical field] [0001] The invention relates to a method for increasing the melting point of coal ash, which belongs to the technical field of coal combustion improvement. [Background technique] [0002] As we all know, coal ash is an extremely complex inorganic mixture, and the main component of coal ash is Al 2 o 3 , SiO 2 , CaO, MgO, Fe 2 o 3 、K 2 O, Na 2 O, TiO 2 , SO 3 wait. The ash melting point of coal is also different with different component contents. The coal ash melting point is an important indicator of the boiler fuel coal, especially the power plant boiler has very strict requirements on the ash melting point of the fuel coal. This is because coal with a low ash melting point burns in the furnace to produce molten ash that adheres to the furnace wall, which not only affects the thermal efficiency of the boiler, but more seriously causes potential safety hazards. Once an accident occurs, it will cause casualties. Therefore, coal ash melting point i...

AI Technical Summary

Problems solved by technology

This method improves the ash melting point of some coals to a certain extent, but because the serious influence of the sulfur content in coal on the ash melting point is not considered, the scope of application is very limited.

[0004] Those skilled in the art know that sulfur plays a role in lowering the melting point of ash in coal ash, and the sulfur content must be controlled in the boiler coal combustion, otherwise the coal must be desulfurized and additional desulfurization equipment is required, which not only costs more, but also There are many processes, which increases the labor intensity

For low-sulfur coal, due to the influence of the coal-forming environment, its coal ash melting point is relatively low and very unstable, which brings a lot of inconvenience to use