marine engine gauge set marine exhaust temperature gauge

• 2022-11-25

It is necessary to install an exhaust temperature gauge on the marine engine gauge set to check whether the exhaust temperature of the diesel engine is high at any time. The high exhaust temperature of single cylinder of marine diesel engine is caused by leakage of exhaust valve or inaccurate valve timing. The air storage clearance of the cylinder is too large or the compression pressure is too low. The injection angle is too late. The working load of diesel engine is too heavy. The exhaust temperature gauge is inaccurate.

The marine main engine works at full load most of the time, sometimes at variable load. Ships often navigate in turbulence, so marine diesel engines should be able to work reliably under the conditions of trim 15 °~25 ° and heel 15 °~35 °. Most ships use supercharged diesel engines (see internal combustion engine supercharging), and low-power non supercharged diesel engines are only used on small boats. Low speed marine diesel engines are mostly two-stroke engines, medium speed diesel engines are mostly four stroke engines, and high-speed diesel engines are both. Heavy oil is widely used as fuel in high-power medium and low-speed diesel engines, while light diesel is still used in high-speed diesel engines.

If add marine exhaust temperature gauge can be used to know the exhaust temperature at any time: 400~500 degrees for normal idling and 800~900 degrees for full open acceleration; Some ships need to install this exhaust thermometer to monitor after refitting the turbine. If the temperature exceeds 900 degrees, it indicates that there is a problem with refitting.

According to the calculation theory of the chemical formula, the mixing ratio (weight ratio) is 15,12:1, and the excess air theory that is the result of combustion is equal to zero. The most economical fuel saving A/F value is 14.7, which is the central benchmark for engine tuning. The air fuel ratio of NA car is roughly adjusted between 12.5 and 13.8 under minor modification. The A/F of TURBO car is adjusted between 10.5 due to high intake air and high combustion temperature; Gas oil is used to reduce combustion temperature and excess oxygen supply, so as to protect the engine and obtain reliable safety. However, the setting of air-fuel ratio does not have a certain standard, which is generally within a range. With the various combinations of exhaust temperature meters, the A/F value suitable for the maximum power output of the engine can be found.