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煤磨推力瓦温度高是什么原因?

2024-04-13

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影响煤立磨推力瓦温度的因素主要有以下几种:

1、润滑油压力及油质润滑油压力低会使磨煤机减速机内部供油量减少,推力盘和瓦之间形成的油膜较薄,磨煤机运行中发生振动时,因部分瓦与盘面产生接触性摩擦导致瓦温超温甚至烧损。润滑油脏污或变质后,运行中如有脏物镶嵌在瓦面上,会因瓦面磨损致使瓦面温度升高。

2、磨煤机的热风温度如果进入磨煤机的热风温度过高,会引起磨煤机整体温度上升并通过磨盘传热给润滑油,导致油温、瓦温升高。

3、密封风压力磨煤机的密封风压力低,会导致密封风无法密封驱动盘密风室内的热一次风,使传动盘受热后油温、瓦温升高。

4、磨煤机磨盘与磨辊间的煤层厚度磨煤机磨盘与磨辊间的煤层过薄容易引起磨煤机整体振动,导致推力瓦和推力盘之间油膜波动,瓦和盘面接触摩擦,导致瓦温升高。

5、稀油站冷却器冷却效果如果稀油站冷却器冷却效果不好,磨煤机减速机推力瓦和磨盘之间的润滑油因润滑升温后无法冷却或冷却效果不好,导致油温升高;温度逐步升高后,油质粘度变小,油膜变薄,使盘和瓦之间产生摩擦发热,更加快了温度上升的速度,形成恶性循环,导致瓦面烧损。另外,出现稀油站加热器无法停运的情况时,润滑油会因连续受热直接导致油温升高。

6、推力瓦材质磨煤机减速机推力瓦材质大部分是巴氏合金,抗磨性能较好、造价高,适用于重载、中高速场合;如果推力瓦材质是聚四氟乙烯,耐腐蚀性、密封性、耐温性(能在-180—250℃长期工作)等性能优异,造价低,但材质线胀系数大且随温度发生不规律的变化,在长时间连续载荷作用下容易发生塑性变形。相比而言,巴氏合金瓦较耐用,磨损后一般能自动磨去高点恢复正常,但价格昂贵。

7、减速机内部供油方式油质不合格或供油方式不合理容易造成瓦面局部温度过高,在长时间载荷作用下易使瓦面产生麻点或变形,甚至损坏推力瓦。

以上回答仅供参考。

来源:备件网

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