从混凝土烟道来的热脏烟气通过升压风机，再通过热交换器入口进入热交换器。
From the concrete ducting the hot dirty flue gas enters the booster fan and then passes the inlet of the GGH.
四角切圆燃烧锅炉炉膛出口气流的残余旋转，是形成炉膛出口和水平烟道两侧烟温偏差的重要原因，可造成高温受热面热偏差和超温爆管。
In circular firing system, residual rotation of airflow at furnace outlet is the main reason for gas temperature deviation between two sides of furnace outlet and horizontal gas duct.
外取热器位于热油泵房、再生器、催化剂罐、大型烟道的中间，所处位置给管束吊装带来了很大的难度。
External catalyst cooler is located between hot oil pump room, regenerator and catalyst tank, very difficult to be hoisted.
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