Process Design Features of Hydrogen-based Shaft Furnace Demonstration Project of ZXHT
The process design features of the hydrogen-based shaft furnace of ZXHT.are summarized.This shaft furnace takes COG fully as its reducing gas source,and COG undergoes in-situ reforming inside the shaft furnace,where CH4 is de-composed catalytically to CO and H2 with the H2/CO ratio up to over 8.This direct reduction process is the one which can obtain the highest percentage of H2 in the industrial production.MDEA-based CO2 removal technology is adopted in the cir-culation of the furnace process gas,which enables the top gas recycled,and can further reduce carbon emissions while impro-ving the reduction efficiency and increasing the output.The"Three Injections"technology(passivator spary on pellets to re-duce the pellet bonding during the reduction process,sulfide injection to protect the high temperature alloy pipe of the heat-er,and oxygen injection to burn the process gas partially)not only solves the operation safety problem,but also effectively increases the operating temperature,improves the reaction efficiency,and reduces the energy consumption of the system.
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