Method for adjusting and controlling melting temperature of coal ash by combining coal blending with auxiliary agent

Abstract

The invention discloses a method for adjusting and controlling the melting temperature of coal ash by combining coal blending with an auxiliary agent, belonging to methods for adjusting the melting temperature of the coal ash. The method comprises the following steps of: uniformly mixing two or more types of coals with different ash melting temperatures according to different mass ratios, and preliminarily adjusting the melting temperature of the coal ash; and selecting an appropriate auxiliary agent, putting the auxiliary agent into the mixed coal, and adjusting the flowing temperature of the coal ash by changing the mass ratio of (Al2O3+SiO2) / (CaO+MgO+Fe2O3). The flowing temperature of the coal ash is raised or lowered by using a combined adjusting and control technology of blending of coals with different ash melting points and adding of auxiliary agents. Firstly, the sulfur content is adjusted by mixing different coals and the flowing temperature of the coal ash is preliminarily adjusted, and then a small quantity of auxiliary agent is used for adjusting the flowing temperature (FT) of the coal ash to reach a designed temperature. The auxiliary agent is added according to the following standards: (1) when (Al2O3+SiO2) / (CaO+MgO+Fe2O3) is more than 0.5 and less than or equal to 3.5, the FT is less than 1,300 DEG C; (2) when (Al2O3+SiO2) / (CaO+MgO+Fe2O3) is more than 3.5 and less than or equal to 5.5, FT is more than 1,300 DEG C and less than 1,400 DEG C; (3) when (Al2O3+SiO2) / (CaO+MgO+Fe2O3) is more than 5.5 and less than or equal to 10, FT is more than 1,400 DEG C and less than 1,500 DEG C; and (4) when (Al2O3+SiO2) / (CaO+MgO+Fe2O3) is more than 10, FT is more than 1,500 DEG C. By adopting the method, the sulfur content of the mixed coal can be adjusted while the melting temperature of the coal ash is adjusted and controlled, so that the utilization market of coals is well optimized and expanded.

Description

technical field [0001] The invention relates to a method for adjusting the melting temperature of coal ash, in particular to a method for jointly adjusting the melting temperature of coal ash with coal blending and additives. Background technique [0002] my country is rich in coal resources, and there are great differences in the ash composition of different coal types and coal seams, resulting in different ash melting properties of different coals. The melting temperature of coal ash is the temperature required for coal ash to reach a molten state at high temperature. The melting characteristics of coal ash are an important indicator of power coal and gasification coal. When coal is burned in a boiler, a large amount of ash is generated. scum. Ash slag may melt at high temperature and adhere to the heating surface of the boiler, causing slagging. Slagging not only affects the heating of the boiler, consumes heat, and causes heat loss; it also destroys the water circulati...

AI Technical Summary

Problems solved by technology

Coal blending is limited by the existing coal types in the coal yard, and the blended coal may not completely reach the ideal ash melting temperature. In addition, because many coal blending processes also need to consider the sulfur content of the blended coal, a single adjustment method is very difficult. Difficult to achieve the desired effect

A single addition of flux will not only reduce the calorific value, but also increase the ash content

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