导致120千瓦柴油发电机组启动困难原因

2025-03-16 19:29:38
推荐回答(2个)
回答1:

(1)摩擦阻力加大

柴油机曲轴旋转阻力矩和启动转速在低温条件下主要受机油黏度的影响。随着外界温度降低,机油黏度增加甚至凝结,流动性差,各摩擦副之间的阻力加大,从而加大了曲轴的旋转阻力矩,使柴油机启动转速降低。压缩终了时,汽缸内压缩空气若达不到柴油燃烧所需的压力和温度,柴油机难以启动。

(2)启动功率加大柴油机所选用的机油黏度等级越大,柴油机启动所需要的功率也越大。例如,某柴油机在-23.3°C温度下,使用SAE10W机油只需3.7KW的启动功率,使用SAE20W机油启动功率则需7.4KW,而使用SAE30W机油启动功率竟增加到11.8KW。 
(3)柴油的黏度和密度增大

随着外界温度的降低,柴油的黏度和密度均增大,表面张力加大。据测定,当气温从40°C降到-10°C时,柴油的黏度提高83%,密度增大8%。这样就使柴油的流动性变差,雾化不良,延长了着火滞后期,造成柴油机启动困难。

(4)蓄电池的输出功率减小

蓄电池的最佳工作温度在10°C~40°C范围。在低温条件下,蓄电池电动势变化不大,即环境温度有较大变化时,蓄电池的单格电压下降并不多。但是,随着温度的降低,蓄电池的电解液黏度增大,向极板的渗透能力下降,内阻增加;而为了防止电解液结冰,处界温度越低,越需加大电解密度。

同时,启动柴油机时,蓄电池的放电电流很大,蓄电池的端电压和容量下降明显。蓄电池输出能力在-30°C时,只有额定输出的34%左右。柴油机低温启动时本来就需要较大的启动功率,但是低气温使蓄电池的输出功率减小,无力拖动启动机带动柴油机旋转或不能过到最低启动转速,都将导致柴油机难以着火运转。

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回答2:

  导致柴油发电机启动困难主要原因有以下几个:
  一是低压油路出现故障;
  二是输油泵出现故障;
  三是供油传动系出现故障;
  四是喷油泵出现故障;
  五是喷油器出现故障等

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