Additive for inhibiting alkali metal release in Zhundong high-sodium coal combustion and realization method thereof

Abstract

The invention relates to an additive for inhibiting alkali metal release in Zhundong high-sodium coal combustion and a realization method thereof. The additive comprises the following components and the corresponding mass percentages: 10-55% of kaolin, 0-15% of bentonite, 5-20% of diatomite, 15-60% of micalex, 10-50% of pyrophyllite, 0-15% of sepiolite, and 0-15% of quartz sand. The additive has the beneficial effects that the additive can effectively inhibit more than 70% of alkali metal release through being mixed with coal, and significantly improves the ash melting characteristics of the coal; with flexible use of some cheap inorganic minerals as effective ingredients of the additive, the slagging and corrosion problems produced during the high-sodium coal combustion process are solved; safe operation of combustion equipment is effectively ensured; and the additive is both economical and convenient, and can be widely applied to high-sodium coal combustion thermal power stations, coal chemical industry, blast furnace ironmaking and other industries.

Description

technical field [0001] The invention relates to an additive for inhibiting the release of alkali metals in Zhundong high-sodium coal combustion and its realization method. Background technique [0002] In recent years, my country has discovered a large number of coal resources in Xinjiang and other regions. Taking the Zhundong coalfield in Xinjiang as an example, its predicted reserves are 390 billion tons. Based on the calculation of my country's total coal consumption of 3.6 billion tons in 2013, the coal resources in the Zhundong region can guarantee the use of the country for more than 100 years, and it has an important energy strategic position. From the perspective of resource characteristics, Zhundong coal is a high calorific value, low ash, low sulfur coal with good combustion characteristics, but its alkali metal sodium content is high, which is more than 5 times that of common coal types. [0003] During the process of coal cracking, gasification and combustion, ...

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Problems solved by technology

[0004] At present, domestic and foreign research on alkali metal release inhibition in coal cracking, gasification and combustion processes is mainly limited to the understanding of alkali metal release process and release mechanism, and most of the reports seen are still at the level of theoretical research. There are few studies, and there are no reports on the additives and implementation methods for inhibiting the release of alkali metals during coal cracking, gasification and combustion.

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