The power combustion characteristics and introduction of biogas in biogas generator units. The reason why biogas can be used as fuel is because it contains more than 50% methane. Generally, biogas contains 60-70% methane. The low calorific value of biogas per cubic meter is about 5000 to 6000 kcal, which has a high calorific value. Due to the presence of carbon dioxide in biogas, its flame propagation speed is reduced, resulting in good anti explosion performance in internal combustion engines. Methane has an octane number between 105 and 115, while biogas has a higher octane number, up to 135. Due to its excellent anti riot performance, the engine can choose a higher compression ratio. Therefore, an internal combustion engine with the same working volume can achieve power not lower than the original engine when using biogas. For example, a large number of agricultural diesel engines owned in rural areas can obtain equivalent power when operating on biogas or dual fuel.

这就使得在配套机具上带来方便，以S195型马力柴油机为例，有二种以上水泵，以及手扶拖拉机、打米、饲料粉碎、发电等作业机具，其配套转速与功率均已定下多年，如要变动，重新为沼气发电机组研制这么一大套新产品，势必事倍功半，难以推广。

This brings convenience in supporting equipment. Taking the S195 horsepower diesel engine as an example, it was originally equipped with two or more types of water pumps, as well as walking tractors, rice threshing, feed crushing, and power generation equipment. Its supporting speed and power have been set for many years. If there is a change, developing such a large new product for the biogas generator set will inevitably result in twice the effort and difficult to promote.

二、柴油内燃机用沼气的改装方法

2、 Modification method for biogas used in diesel internal combustion engines

柴油机和点燃型发动机（汽油发动机）是经济的内燃机。这两种发动机用沼气作为燃料之前必须进行改装，为燃烧室提供适合的混合气，即在化油器前增加一个沼气—空气混合器。

Diesel engines and spark ignition engines (gasoline engines) are economical internal combustion engines. Before using biogas as fuel, these two engines must be modified to provide a suitable mixture for the combustion chamber, that is, adding a biogas air mixer in front of the carburetor.

沼气发动机一般分为压燃式和引燃式两种。

Biogas engines are generally divided into two types: compression ignition and pilot ignition.

压燃式发动机采用柴油—沼气双燃料，通过压燃少量的柴油以点燃沼气进行燃烧做功。这种发动机的特点是可调节柴油/沼气比，当沼气不足甚至停气时，发动机仍能正常工作。缺点在于系统复杂，所以大型沼气发电工程往往不采用这种发动机。而多采用引燃式沼气发动机也称全烧式沼气发动机，其特点是结构简单，操作方便，而且无需辅助燃料，适用大中型沼气工程下工作。柴油机改装为引燃式沼气发动机，除了在化油器前增加一个沼气—空气混合器之外，还需加装一个电点火系统，同时增加火花塞。{$page}

The compression ignition engine uses a dual fuel of diesel and biogas, which ignites a small amount of diesel to ignite biogas for combustion and work. The characteristic of this type of engine is that it can adjust the diesel/biogas ratio, and can still operate normally when the biogas is insufficient or even stopped. The disadvantage is that the system is complex, so large-scale biogas power generation projects often do not use this type of engine. And most of them use pilot ignition biogas engines, also known as full combustion biogas engines, which are characterized by simple structure, convenient operation, and no need for auxiliary fuel, suitable for working in large and medium-sized biogas projects. The modification of a diesel engine to a pilot ignition biogas engine requires not only the addition of a biogas air mixer in front of the carburetor, but also the installation of an electric ignition system and the addition of spark plugs. {$page}

三、沼气—柴油双燃料发动机的操作方法及注意事项

3、 Operating methods and precautions for biogas diesel dual fuel engines

使用方法

Usage method

1、起动：关闭沼气阀，按柴油机的起动方法，用柴油起动操作方法与未改装前一样。

1. Starting: Close the biogas valve, follow the starting method of the diesel engine, and start with diesel using the same method as before.

2、起动后的操作：起动后带上负荷，将柴油机油门放在合适的位置（一般放在中间偏低一点位置），待发动机运转正常后，慢慢地打开沼气阀门输入沼气。通入沼气后，在调速器作用下供油量自动减少，发动机转速稳定。若沼气输入量过多，发动机会出现瞬间供油中断现象，产生断续的工作声。遇到这种情况，应随时即将沼气阀略微关小，直到正常运转为止。

2. Operation after starting: After starting, load the diesel engine and place the throttle in a suitable position (usually slightly lower in the middle). After the engine runs normally, slowly open the biogas valve to input biogas. After introducing biogas, the fuel supply automatically decreases under the action of the governor, and the engine speed stabilizes. If there is too much biogas input, the engine will experience an instantaneous fuel supply interruption, producing intermittent working sounds. In this situation, the biogas valve should be slightly turned down at any time until it operates normally.

在运转过程中，调整转速的方法与改装前用柴油工作时一样，通过改变油门手柄位置来进行。随着双燃料发动机转速或负荷大小的改变，也要相应的开大或关小沼气阀门，以保证双燃料发动机正常运转和较好的节油效果。当沼气—柴油机冷却水温较低已及小负荷运行时，节油效果差。

In the process of operation, the method of adjusting the speed is the same as that of working with diesel before modification, by changing the position of the throttle handle. As the speed or load of the dual fuel engine changes, the biogas valve should also be opened or closed accordingly to ensure the normal operation and good fuel saving effect of the dual fuel engine. When the cooling water temperature of biogas diesel engines is low and they are operating at low loads, the fuel saving effect is poor.

有了管道警示带上面的小总结，希望对广大客户有所帮助，如果有什么不理解的或者寻求帮助的请点击我们的网站：http://www.binzhouhengtong.com或者来电咨询，我们会尽全力为您解决

With the small summary on the pipeline warning tape, I hope it can be helpful to our customers. If you have any questions or need help, please click on our website: http://www.binzhouhengtong.com Or call for consultation, and we will do our best to solve it for you