柴油發電機組是一種采用柴油作為燃料的發電機器，一般采用的是標準0#柴油。發電設備根據為其排放方面，可以分為國二以及國三系列。也可以這么說，是由之前國二排放升級到了國三的排放的，在柴油發動機的技術層面上的，有著較明顯的區別。
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.
柴油發電機組排放由國二升級到了國三之后，主要的變化就是排放更低，油耗更低。若是要說兩者的區別，發電機廠家可以參考一下下面的幾點：
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、國二的柴油發動機是有噴油泵(大泵)和噴油器(油頭)的。 而國三的柴油機是帶電噴系統的，有cpu電控盒。
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、發動機國三排放是什么?發動機排放是指從廢氣中排出的CO(一氧化碳)、HC+NOx(碳氫化合物和氮氧化物)、PM(微粒，碳煙)等有害氣體，它們都是發動機在燃燒做功過程中產生的有害氣體。
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、從發動機尾氣排放有害物質含量的高低來看，國三發動機要低于國二發動機;可從柴油發動機的結構來判斷兩者的不同，國三和國二發動機供油系統不同，發動機尾氣中有害物質的排放也不同。
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、目前發電機組采用了高壓共軌和EGR技術(EGR是英文Exhaust Gas Recirculation三個詞的縮寫，意思是廢氣再循環系統。它是針對引擎排氣中有害氣體之一的氮氧化合物NOx所設置的排氣凈化裝置)。國三排放的高壓共軌發動機相比國二排放的EGR發動機在價格上貴。以玉柴柴油發動機為例，一臺國三標準的玉柴發電機價格比國二標準的價格高約幾萬元。
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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