The use of low concentration fuel in generator sets is to ensure the safety and efficiency of the combustion process. The following are several reasons:

1. 安全考慮：使用低濃度燃料可以降低爆炸的風險。高濃度燃料容易在系統中形成可燃氣體混合物，在某些情況下，如泄漏或故障，容易引發火災或爆炸。

1. Safety considerations: Using low concentration fuel can reduce the risk of explosion. High concentration fuel can easily form combustible gas mixtures in the system, and in some cases, such as leaks or malfunctions, it can easily cause fires or explosions.

2. 能：低濃度燃料的燃燒速度較快，可以更好地滿足大功率輸出的要求。此外，燃燒時產生的煙氣和污染物也相對較少，有利于環境保護。

2. High efficiency: Low concentration fuel has a faster combustion rate, which can better meet the requirements of high-power output. In addition, the smoke and pollutants generated during combustion are relatively less, which is beneficial for environmental protection.

3. 經濟性：低濃度燃料通常價格相對較低，使用低濃度燃料可以降低成本。

3. Economy: Low concentration fuels are usually relatively inexpensive, and using low concentration fuels can reduce costs.

綜上所述，使用低濃度燃料的發電機組在安全性、效率和經濟性方面都具備優勢。這也是為什么許多發電機組選擇使用低濃度燃料的原因之一。

In summary, power generation units using low concentration fuels have advantages in terms of safety, efficiency, and economy. This is also one of the reasons why many power generation units choose to use low concentration fuel.