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预热炉为什么要维持负压?影响负压的因素是什么?

问答题
2021-12-28 15:07
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正确答案
预热炉维持负压,主要是燃烧气正常燃烧,这和我们烧炉子要有烟囱那样维持炉子,一定负压使燃烧气正常燃烧一样,如果不能维持炉膛负压,就从看火孔炉墙缝隙冒出来,消耗大量燃烧气,烟道气余热不能回收,对炉体结构也损失很大,影响负压因素:
(1)烟道蝶阀开度大小。
(2)在烟道蝶阀开度一定时,燃料气量和助燃空气量大小也可影响炉膛负压。
(3)炉体、炉顶或炉底有塌落现象也可影响负压。炉内盘管是否漏气也可影响负压。

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