Calcium and magnesium additive for improving coal slagging performance and application

An additive, calcium and magnesium technology, which is applied in the field of coal chemical industry, can solve the problems of large amount of addition and high economic cost of coal blending, and achieve the effects of improving slagging, avoiding furnace flameout accidents, and reducing boiler slag formation

CN108676601APending Publication Date: 2018-10-19NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-10-19

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Abstract

The invention discloses a calcium and magnesium additive for improving the coal slagging performance and application, and belongs to the technical field of coal chemical industry. The calcium and magnesium additive is a mixture of carbide slag and magnesium-containing waste slag; when the addition amount of the calcium and magnesium additive is within a suitable range, the ash melting point can beincreased by 100-150 DEG C, and calcium oxide in the carbide slag is produced into calcium-containing aluminosilicate having a melting point higher than that of sodium aluminosilicate through a competitive reaction so as to increase the ash melting point and solve the slagging problem; meanwhile, calcium carbide in the carbide slag reacts with water in air to produce acetylene gas, so that a combustion-supporting effect is achieved and flameout of a hearth is avoided; magnesium oxide in the magnesium-containing waste slag reduces the viscosity and avoids large slag formation in a boiler through prevention of aggregation of a polymer; the used carbide slag and the used magnesium-containing waste slag are industrial wastes, and the purchase cost thereof is much lower than that of kaolin, diatomite and bauxite, so that low-cost improvement on the slagging performance can be achieved, and thus the operating cost of a power plant is greatly reduced.
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Description

technical field

[0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a calcium and magnesium additive for improving coal-fired slagging performance and its application. Background technique

[0002] China is a major country that uses coal as its resource, and it is of great significance to use the existing coal resource cleanly and efficiently. In thermal power plants, the boiler heating surface is prone to serious slagging, contamination and corrosion problems during the burning process of high-sodium coal, which not only reduces the heat transfer efficiency of the boiler, but also affects the safe operation of the boiler, seriously limiting Large-scale use of high-sodium coal.

[0003] The slagging problem of coal ash has an important relationship with the melting property of coal ash, and the ash melting temperature is usually used to characterize the melting characteristics of coal ash. The melting temperature of c...

Examples

Embodiment 1

[0079] Add calcium carbide slag and ethyl maltol magnesium waste slag with different contents and fully ground to the high-sodium coal, wherein calcium hydroxide content in calcium carbide slag is 85%, and magnesium oxide content in ethyl maltol magnesium waste slag is 60% ; Since the activity of CaO is the highest at about 900°C-1000°C, and the activity of MgO reaches the maximum at 700°C, therefore, according to the temperature distribution above the combustion boiler, the nozzles for carbide slag, the nozzles for ethyl maltol magnesium-containing waste residue, and the nozzles for carbide slag and ethyl maltol The different injection temperature of base maltol magnesium-containing waste slag makes the activities of calcium carbide slag and ethyl maltol magnesium-containing waste slag reach the highest.

[0080] Add different contents of calcium carbide slag, and conduct SEM analysis on the coal ash obtained by burning at 1200°C, the results are as follows: figure 1 The data s...