柴油发电机组是一种采用柴油作为燃料的发电机器，一般采用的是标准0#柴油。发电设备根据为其排放方面，可以分为国二以及国三系列。也可以这么说，是由之前国二排放升级到了国三的排放的，在柴油发动机的技术层面上的，有着较明显的区别。
The diesel generator set is a power generation machine that uses diesel as fuel, and generally uses standard 0 # diesel. The power generation equipment can be divided into the second and third series according to its emission. It can also be said that the emission of the former country 2 has been upgraded to that of the third country. There are obvious differences in the technical level of diesel engines.
柴油发电机组排放由国二升级到了国三之后，主要的变化就是排放更低，油耗更低。若是要说两者的区别，发电机厂家可以参考一下下面的几点：
After the emission of diesel generator set has been upgraded from country 2 to country 3, the main change is lower emission and lower fuel consumption. For the difference between the two, the generator manufacturer can refer to the following points:
1、国二的柴油发动机是有喷油泵(大泵)和喷油器(油头)的。 而国三的柴油机是带电喷系统的，有cpu电控盒。
1. The diesel engine in the second stage of the country has fuel injection pump (large pump) and fuel injector (fuel head). However, the diesel engine of the third grade is equipped with an electric injection system, with a cpu electronic control box.

2、发动机国三排放是什么?发动机排放是指从废气中排出的CO(一氧化碳)、HC+NOx(碳氢化合物和氮氧化物)、PM(微粒，碳烟)等有害气体，它们都是发动机在燃烧做功过程中产生的有害气体。
2. What are the three emissions of the engine? Engine emissions refer to the harmful gases such as CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), PM (particulates and soot) emitted from the exhaust gas. They are all harmful gases generated by the engine during combustion.
3、从发动机尾气排放有害物质含量的高低来看，国三发动机要低于国二发动机;可从柴油发动机的结构来判断两者的不同，国三和国二发动机供油系统不同，发动机尾气中有害物质的排放也不同。
3. In terms of the content of harmful substances in engine exhaust emissions, the third engine is lower than the second engine; The difference between the two can be judged from the structure of the diesel engine. The fuel supply system of the third and second engines is different, and the emissions of harmful substances in the engine exhaust are also different.
4、目前发电机组采用了高压共轨和EGR技术(EGR是英文Exhaust Gas Recirculation三个词的缩写，意思是废气再循环系统。它是针对引擎排气中有害气体之一的氮氧化合物NOx所设置的排气净化装置)。国三排放的高压共轨发动机相比国二排放的EGR发动机在价格上贵。以玉柴柴油发动机为例，一台国三标准的玉柴发电机价格比国二标准的价格高约几万元。
4. At present, the generator set adopts high pressure common rail and EGR technology (EGR is the abbreviation of Exhaust Gas Recirculation, which means exhaust gas recirculation system. It is an exhaust purification device set for NOx, one of the harmful gases in the engine exhaust). The high pressure common rail engine with the third emission is more expensive than the EGR engine with the second emission. Taking Yuchai diesel engine as an example, the price of a Yuchai generator of the third national standard is about tens of thousands of yuan higher than that of the second national standard.
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