The digesters may be heated with direct or indirect steam and, in some cases, an outside liquor circulating system is used.
蒸煮锅可以采用直接加热或间接加热方式，有时也使用外部液体循环系统加热。
Effect of furnace wall emissivity on surface heat flux of heated stock is analyzed for direct firing furnace and indirect heating furnace.
分析了炉壁黑度对炉膛辐射换热流的影响，分别对火焰直接加热炉和间接加热炉进行了讨论。
The paper introduces a continuous car type furnace for direct reduction of iron ore. Coal-containing iron ore pellets are laid on cars and carried to pass through furnace to be heated and reduced.
介绍一种用于铁矿直接还原的台车连续炉，含碳球团料层铺在台车上并通过炉膛进行焙烧和还原。
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