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Calcium carbide furnace renovation project Sanming Chemical Plant # 4 (1987) is a provincial key project. The said furnace transformer holds a capacity of 20000kVA and a production capacity of 36,000 tons / year of calcium carbide. 4 # carbide furnace uses a semi-enclosed furnace, together with flue gas heat recovery equipment and a new flue gas dust removal device. It uses low energy consumption which is very effective at protecting the environment and has greatly improved working conditions and is the province’s (and even the country’s) energy saving and emission reducing design in terms of the calcium carbide industry.