伟大的LR是怎么了？明明是烧的LNG，还说是柴油发电机组？

阅读模式 · 发表于 2016-7-28 13:37

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labilaoxin · 发表于 2016-7-28 13:43

双燃料吧，还是柴油机，只不过换成了LNG
这种机器应该叫什么？LNG发电机组？

offshoretech · 发表于 2016-7-28 14:26

不用柴电也可以的，用涡轮。

江海直达 · 发表于 2016-7-28 17:00

本帖最后由江海直达于 2016-7-28 17:01 编辑

The diesel engine (also known as a compression-ignition or CI engine) is an internal combustion engine in which ignition of the fuel that has been injected into the combustion chamber is caused by the high temperature which a gas achieves when greatly compressed (adiabatic compression). This contrasts with spark-ignition engines such as a petrol engine (gasoline engine) or gas engine (using a gaseous fuel as opposed to petrol), which use a spark plug to ignite an air-fuel mixture. In diesel engines, glow plugs (combustion chamber pre-warmers) may be used to aid starting in cold weather, or when the engine uses a lower compression-ratio, or both.
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A Diesel engine built by MAN AG in 1906

The diesel engine has the highest thermal efficiency (engine efficiency) of any practical internal or external combustion engine due to its very high expansion ratio and inherent lean burn which enables heat dissipation by the excess air. A small efficiency loss is also avoided compared to two-stroke non-direct-injection gasoline engines since unburnt fuel is not present at valve overlap and therefore no fuel goes directly from the intake/injection to the exhaust. Low-speed diesel engines (as used in ships and other applications where overall engine weight is relatively unimportant) can have a thermal efficiency that exceeds 50%.[1][2]
Diesel engines are manufactured in two-stroke and four-stroke versions. They were originally used as a more efficient replacement for stationary steam engines. Since the 1910s they have been used in submarines and ships. Use in locomotives, trucks, heavy equipment and electricity generation plants followed later. In the 1930s, they slowly began to be used in a few automobiles. Since the 1970s, the use of diesel engines in larger on-road and off-road vehicles in the US increased. According to the British Society of Motor Manufacturing and Traders, the EU average for diesel cars accounts for 50% of the total sold, including 70% in France and 38% in the UK.[3]
The world's largest diesel engine is currently a Wärtsilä-Sulzer RTA96-C Common Rail marine diesel, which produces a peak power output of 84.42 MW (113,210 hp) at 102 rpm.[4][5]

江海直达 · 发表于 2016-7-28 17:04

Spark Ignition (SI) engine can be compared with Compression Ignition (CI) engine system in 7 aspects. Those 7 aspects are engine speed, cycle efficiency, fuel used, time of knocking, cycle operation, pressure generated and constant parameter during cycle.

S.no	Aspect	Spark Ignition Engine	Compression Ignition Engine
1	Engine speed	SI engines are high speed engines.	CI engines are low speed engines.
2	Cycle efficiency	SI engines have low thermal efficiency	CI engines have high thermal efficiency.
3	Fuel used	Petrol is used as fuel, which has high self ignition temperature.	Diesel is used as fuel, it has low self ignition temperature.
4	Time of knocking	Knocking takes place at the end of combustion.	Knocking takes place at the beginning of combustion.
5	Cycle operation	SI engine works on otto cycle.	CI engine works on diesel cycle.
6	Pressure generated	Homogeneous mixture of fuel, hence high pressure is generated.	Heterogeneous mixture of fuel, hence low pressure is generated.
7	Constant parameter during cycle	Constant volume cycle.	Constant pressure cycle.

江海直达 · 发表于 2016-7-28 17:06

A gas turbine, also called a combustion turbine, is a type of internal combustion engine. It has an upstream rotating compressor coupled to a downstream turbine, and a combustion chamber in between.
The basic operation of the gas turbine is similar to that of the steam power plant except that air is used instead of water. Fresh atmospheric air flows through a compressor that brings it to higher pressure. Energy is then added by spraying fuel into the air and igniting it so the combustion generates a high-temperature flow. This high-temperature high-pressure gas enters a turbine, where it expands down to the exhaust pressure, producing a shaft work output in the process. The turbine shaft work is used to drive the compressor and other devices such as an electric generator that may be coupled to the shaft. The energy that is not used for shaft work comes out in the exhaust gases, so these have either a high temperature or a high velocity. The purpose of the gas turbine determines the design so that the most desirable energy form is maximized. Gas turbines are used to power aircraft, trains, ships, electrical generators, and tanks.[1]

江海直达 · 发表于 2016-7-28 18:48

其实就是漏标注双燃料发电机组。

[轮机] 伟大的LR是怎么了？明明是烧的LNG，还说是柴油发电机组？