The important index for selecting lignite to produce briquette for low-temperature dry distillation is mainly the lignite oil content. It is generally desirable to have a dry base oil content greater than 10%. The lignite-type coal refining type coke system adopts the vertical high-temperature coke oven developed by the former Democratic Germany. After the coal enters the coke oven, the moisture of the briquette is reduced to 2% to 3% by the upper drying belt of the lignite dryer. Entering the carbonization chamber. In order to meet the requirements of this type of coke ironmaking, a low-profile ironmaking furnace was also designed and built. The type of coke is also widely used in the manufacture of calcium carbide, colored smelting, sintered ore, and burnt lime. Its high-quality coke is used for steelmaking carbonation, non-ferrous metal smelting, preparation of activated carbon and adsorbent, baking fuel, etc., and is also exported to other countries.
The physical changes that occur when lignite dryers dry lignite are indicated by the following four points:
1. When the lignite temperature is higher than 150 degrees, the hydroxyl functional group is decomposed, and the CO2 gas is precipitated, and the bound water of the lignite is excluded. Further increase in temperature will result in the decomposition of more and more hydroxyl functional groups, causing a change in the surface properties of the lignite.
2. When lignite is heated to 100 degrees or more at normal temperature, most of the free water can be evaporated.
3. When the lignite continues to heat above 180 degrees under normal pressure, the lignite-bound water can be removed.
4. When the moisture of lignite is less than 15%, if it is necessary to continue drying and dehydration, that is, when the combined water is removed, since the lignite has a strong binding force with the bound water, higher temperature and energy are required to be carried out.
For the production of lignite briquettes for different purposes, the requirements for the crushing size of lignite are different. For the briquettes used for the production of high-temperature coking and low-temperature dry distillation, the lignite crushing granularity is required to be less than 1 mm and less than 3 mm, respectively, and the particle size may be coarser when used for power. Here, it is recommended to use a slime pulverizer for the crushing of lignite, which is suitable for the crushing of wet coal and large coal products such as lignite and slime.
For more information on the powerful dryer equipment, please visit the website of Henan Powerful Road and Bridge Engineering Co., Ltd.:
Lignite dryer: http://
Desulfurization gypsum dryer: http://Product-68.html
Tumble dryer: http://
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