To save energy raising heat efficiency of furnace is an important measure.

为了节约能源，提高加热炉的热效率是一项重要的措施。

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Flue gas can also beset up waste heat recovery system to increase the thermal efficiency of furnace.

也可以设置烟气余热回收系统来提高加热炉的热效率。

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Its design concept is to recuperate flue gas and increase heat efficiency of furnace at a maximum extent.

其设计指导思想是，最大程度地回收炉子的烟气余热，提高炉子热效率。

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"The efficiency and sustainability of the new furnace will also make a major contribution to our efforts to create an 'all-weather' company in Europe, " said Mr Kohler.

BBC: Wales