1. Rough heat two-stage furnace gas process.
       2. Two-stage furnace gas removal process.
       3. Cold clean two-stage furnace gas process (using secondary water washing).
       4. Cold and clean two-stage furnace gas process.
       5. Cold and clean two-stage furnace gas process (using air cooling and intercooling).
       6. Cold and clean two-stage furnace gas process (using waste heat boiler, air cooling and intermediate cooling).
       7. Separation process of hot and cold furnace gas.
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