Lignite upgrading
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Lignite drying (at temperatures of 100–200 degrees) can only remove some of the surface water, and its calorific value rarely exceeds 4500 kcal； Moreover, it is prone to spontaneous combustion and reabsorbing external moisture during transportation and storage. Lignite upgrading (low-temperature retorting at temperatures of 500–550 degrees) not only removes external and internal water but also eliminates some of the volatile components; its calorific value is approximately 5,500 kcal ； Modified and improved lignite (improved coal) is easier to store and transport.
American technology; currently, Datang Huayin is carrying out projects in Inner Mongolia, with the Fourth Research Institute handling the design work
This is also a technology for the comprehensive utilization of lignite; it should be an extension of the “coal stripping” process
This is definitely a key area for development, haha – mainly to improve the utilization rate and added value of low-quality coal
Similar to the fixed-bed gasification combined with fluidized-bed gasification approach, the hydrogen yield is relatively high