Furnace No. 3 operated continuously for 128 days, setting a new record for the operation duration of ash pyrolysis gasification furnaces in China
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The gasification furnace at Yunnan Wenshan Aluminum Industry operated continuously for 128 days, once again setting a new record for the operation duration of ash fusion gasification furnaces in China. At 20:16 on November 1st, following the successful simultaneous operation of Furnaces #1 and #2, Furnace #3 in the gas production area was shut down for maintenance. This time, Furnace No. 3 operated continuously for 128 days, setting a new record for domestic ash fusion gasification furnaces once again. This demonstrates an further improvement in the maturity and reliability of industrial applications of ash fusion fluidized bed pulverized coal gasification systems. However, the 128-day record is not a coincidence; it is the result of the gas industry professionals overcoming repeated tests of their mental strength and wisdom, while also continuously learning from experience, organizing their thoughts, and striving for progress. (Source: http://ynwsly.net/news/6229.html)
Could you share some experience in operations or management?
Moderator, the carbon conversion rate is around 90%. In my opinion, low-rank coal has high reactivity; as long as its bonding index is not too high and its thermal stability is acceptable, fluidized beds can achieve high efficiency.
What is the operating temperature? Is any wastewater generated? How should the resulting waste be disposed of?
The operating temperature is around 850–900 degrees, and the wastewater produced contains very low levels of tar, so water treatment is not a major issue. During the initial operation of the gasification furnace, the main challenge was dealing with fine powder; the humidifiers did not perform well, and the working environment was messy. In subsequent modifications, the fine powder was transported over long distances to a filter press using silo pumps, where it was shaped and then mixed into a circulating fluidized bed boiler for combustion. This approach enabled the overall efficiency of the gasification furnace system to reach 95%, allowing for ultra-efficient operation of the lignite. In response to the ban on boiler systems in some areas, the Institute of Coal Chemistry under the Chinese Academy of Sciences is developing a small-scale fluidized bed process to centrally handle the fine powder generated by gasifiers, thereby achieving a system efficiency of 98% for ash-polymerized fluidized bed gasifiers.
Is there any operating procedure for the gray fused-bed fluidized-bed powder coal gasification unit that you can share with us?
It’s not difficult either – just dry the raw coal to keep the moisture content below 18%, and crush the particles to a size of 0-6 mm； The three-inlet system is operated in accordance with the process package provided by the Institute of Coal Chemistry, Chinese Academy of Sciences, for testing different coal types (distribution plate gas, annular tube gas, jet gas) ； As for the actual problems encountered in operation, experience needs to be accumulated; after all, research institutions focus primarily on scientific research and lack experience in long-term operations