Which gasification method is the most cost-effective for brown coal gasification
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Which gasification method is the most economical and feasible for brown coal gasification? Such as dry gasification, like Shell and Space Furnace, etc ； For wet gasification methods such as water coal slurry and multi-nozzle systems, which one is the most suitable?
For brown coal gasification, the most widely used and successful method is probably pressurized coal gasification!
Is this the technology of Yunnan Coal Chemical Group?
The solid slag discharge technology for coal grinding is not from Yunnan Coal Chemical.
Oh, thank you. Where is that? There are solid slag discharge using crushed coal and liquid slag discharge using crushed coal – which units or companies are good at doing these? Is lignite easier to turn into crushed coal, or is it more difficult to convert it into coal powder?
Lignite has a high moisture content, and a large amount of energy is required to dry it in order to turn it into pulverized coal
In China, fluidized-bed gasification technology has already been used with lignite as raw material; the Datang Dolun coal chemical project employs Shell furnaces, while Inner Mongolia Cornell uses space-type furnaces.
Oh, have both of these systems been operating stably for a long period of time?
Saiding Engineering Company (formerly the Second Chemical Research Institute) has extensive experience in Lurgi and BGL coal gasification technologies using crushed coal, and both Yunnan Jiehua and Datang Keqi use lignite.
There are many factors that affect brown coal gasification. Firstly, the moisture content in the coal limits its thermal stability and the costs associated with drying it; Secondly, its slurry-forming properties also have a significant impact, and these factors place considerable constraints on the choice of gasification process. Currently, although both Shell and BGL are performing well, due to the characteristics of lignite, operations are not particularly easy. It has long been believed that the Ruchi process has the greatest impact on wastewater treatment, but thanks to ongoing efforts, wastewater can now meet the conditions for reuse; therefore, the most mature process at present remains the Ruchi process.
Oh, thank you, moderator. One more question: Lignite can be ground into a very fine powder. Then why is not the gasification technology using fluidized beds employed, but rather the gasification technology using pulverized coal?