adj. underfired
所有的燃煤都是从燃烧床的下部进入燃烧炉。
火区下部空区和燃烧中心区的勘探在煤田火区环境治理过程中十分重要，常规的勘探方法难以解决。
The detection of cavities and burning hotspots under the fire zone are very important during the coal fire fighting process, which could hardly be solved by the conventional detection technologies.
燃烧室的最高壁温出现在凹腔前壁面下部或凹腔上壁面中部；
The hot spot temperature of combustor appeared in the lower of fore-wall or in the middle of upper-wall.
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