（5）预热区（preheating zone）：指火灾透过輻射、对流及传导等热传方式，将火 灾热能不断往尚未燃烧之可燃物区延伸，不断加热未燃烧之可燃物，使未引燃之可燃物...
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炉体分为预热区、加热区、保温区、缓冷区。
It is divided into preheating zone, heating zone, heat preservation zone and natural cooling.
预热区使用加热器加热，温度可控，可满足各种绝缘需求。
Preheating zone with taper design, use heaters heating, temperature can control, can meet all kinds of insulation varnish requirements.
无氧化段由入口密封室，废气预热区，直接加热区，炉喉，废气排放系统组成。
The non-oxidizing zone is consisted of entry sealed room, waste gas preheating zone, direct heating zone, and furnace nozzle and flue gas exhausting system.
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