Measuring method and device for CO2 gas emission of marine diesel engine

Abstract

The invention discloses a measurement method and apparatus used for CO2 gas discharge of a ship diesel engine. At various operation states during a full operation period of the diesel engine, a total fuel consumption amount, an unburned fuel amount, a cylinder oil consumption amount and an air consumption amount of the diesel engine are obtained through measurement, and a total CO2 gas discharge amount of the diesel engine is obtained according to the following calculation formulas: qmc=(QMin / 0.273)*99%*F, QMin=(QF-QR)*FC%+QC*CC%+QA*AC%, F=(qmcl*H / 1000) / [(QMin / 0.273)*99%], qmcl=ugas*cgas*qmew, and qmew=qmaw+qmf. According to the invention, the method and apparatus break limitations of an E3 test cycle type, specified by an MARPOL convention, additionally measure the cylinder oil consumption amount and the air consumption amount, provide a brand new diesel engine CO2 gas discharge amount calculation mode, improve the accuracy of an obtained result, realize testing of the CO2 gas discharge amount at various operation states in the whole work process of the diesel engine, can be applied to an engine test running-in period and a load-varying process, and have a guidance effect for reducing and controlling the greenhouse gas discharge amount of the diesel engine.

Description

technical field [0001] The invention relates to a method for measuring the performance of marine diesel engines, in particular to a CO 2 A method and device for measuring gas emission belong to the technical field of diesel engines. Background technique [0002] In order to maintain a good ecological environment of the ocean by eliminating pollution caused by dumping pollutants into the ocean, discharging oil, and discharging harmful gases into the atmosphere, countries around the world have jointly concluded the International Convention for the Prevention of Pollution from Ships (MARPOL73 / 78), In order to achieve the lowest level of pollution caused by the discharge of such harmful substances. The MARPOL Convention stipulates the limit standards for ships to discharge harmful waste gas to the environment, including NOx, SOx, COx and THC. The main source of harmful emissions from ships is marine diesel engines, so marine diesel engines are required to hold the Internationa...

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Problems solved by technology

[0024] Since the existing measurement scheme is established according to the MARPOL convention, the diesel engine exhaust gas measurement and calculation method of the convention is only suitable for the measurement and calculation of diesel engine emissions under steady load conditions, but the load of diesel engines in actual operation is constantly changing, for example The diesel engine has a run-in period, a load-up period and a load-down period, and the run-in period also has two operating states, stable and unstable. Therefore, the existing diesel engine greenhouse gas measurement cannot adapt to the measurement of exhaust emissions during the entire operation of the diesel engine. At the same time, the current calculation of exhaust emissions is not accurate enough, and only involves a single factor of fuel consumption. In fact, CO in diesel engine exhaust 2 The source of gas is not only fuel, but also cylinder oil and air

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