The generator set is precisely a complete set of mechanical equipment that converts other forms of energy into electric energy. It is composed of power system, control system, silencing system, damping system and exhaust system. It is driven by water turbine, steam turbine, diesel engine or other power mechanical drives to convert the energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy and transmit it to the generator, Then it is converted into electric energy by the generator and output to the electrical equipment for use.

而发电机组又分为单燃料发电机组和双燃料发电机组。

The generator set is divided into single fuel generator set and dual fuel generator set.

单燃料发电机组：单燃料发电机组又称为全烧式发电机组，在沼气产量大的场合可连续稳定地运行，适合在大、中型沼气工程中使用，可以使用天然气发电机组，亦可由柴油机改装而成。由于气体燃料的组分、热值、物理性能、着火温度、爆炸极限、燃烧特性存在很大差异。

Single fuel generator set: single fuel generator set, also known as full fired generator set, can operate continuously and stably in occasions with large biogas output. It is suitable for large and medium-sized biogas projects. It can use natural gas generator set or be refitted from diesel engine. There are great differences in composition, calorific value, physical properties, ignition temperature, explosion limit and combustion characteristics of gaseous fuel.

当利用天然气发电机组燃烧沼气时，需对发电机组的相关部件进行必要的调整或改装，例如发电机组的空气-燃气混合器，在改装时，空气阀的通径需扩大1.4倍左右；此外，还应根据发电机组对空燃比和调节特性的要求，确定燃气阀芯的型号，设计若干组阀座与阀芯的配合方案，以备筛选。

When using natural gas generator set to burn biogas, it is necessary to adjust or refit the relevant components of the generator set, such as the air-gas mixer of the generator set. During refitting, the diameter of the air valve needs to be expanded by about 1.4 times; In addition, the model of gas valve core shall be determined according to the requirements of generator set for air-fuel ratio and regulation characteristics, and several groups of matching schemes of valve seat and valve core shall be designed for screening.

也就是说，单燃料发电机组只能用一种材料发电，而双燃料则能用两种燃料，这就是他们的区别。

In other words, a single fuel generator set can only use one material for power generation, while a dual fuel generator set can use two fuels, which is the difference between them.