A simulation test method for tier III performance of marine low-speed diesel engine

Abstract

The invention provides a simulation test method of Tier III performance of a marine low-speed diesel engine. The marine low-speed diesel engine comprises a parent form machine and a sub-type machine,wherein the exhaust gas of the sub-type machine directly enters a supercharger through an exhaust manifold, a throttling orifice plate is arranged in a pipeline of the exhaust manifold connected withthe supercharger for replacing and simulating a "throat" function of an HPSCR device so as to perform a performance simulation test under a Tier III condition and diesel engine performance parameter verification under the Tier III condition, and a diameter of a throttling orifice of the throttling orifice plate is calculated according to the diesel engine thermodynamic principle and diesel engineperformance data under the Tier III condition. According to the simulation test method provided by the invention, the diesel engine performance data under the Tier III condition are simulated by usingthe throttling orifice plate, so hat the performance parameter simulation test of the diesel engine under the Tier III condition and the performance parameter verification of the diesel engine can becompleted without installing the HPSCR device, thereby avoiding a lot of adverse effects brought by the installation of the HPSCR device, and the simulation test method is suitable for bench tests ofsub-type machines of marine low-speed diesel engines in which the HPSCR devices are installed.

Description

technical field [0001] The invention relates to a test method for the performance of a marine low-speed diesel engine, in particular to a simulation test method for the Tier III performance of a marine low-speed diesel engine, and belongs to the technical field of diesel engines. Background technique [0002] With the implementation of Tier III emission regulations, new marine low-speed diesel engines must meet Tier III emission regulations in emission control areas after January 1, 2016. It is a general trend that marine low-speed diesel engines must meet Tier III emission regulations. HPSCR (High Pressure Selective Catalytic Reduction) is a very effective technical measure to solve Tier III emission standards for marine low-speed diesel engines, and is currently widely used in Tier III emission marine low-speed diesel engines. [0003] For marine low-speed diesel engines installed with HPSCR devices, such as figure 1 As shown, when the diesel engine 4 needs to meet Tier I...

AI Technical Summary

Problems solved by technology

Since the HPSCR device is bulky and takes up a lot of space, the installation and commissioning cycle is relatively long, and the HPSCR device needs to be dismantled and sent to the shipyard for installation after the bench test in the workshop, which will consume a lot of money and time

In addition, due to its large size, the arrangement of the HPSCR device will also affect the debugging and testing of diesel engines in other relevant workshop test benches. Therefore, if the sub-type machine is also installed with a complete HPSCR device during the bench test in the workshop, it will definitely affect the normal operation of other diesel engines. debugging

[0006] Therefore, for marine low-speed diesel engine units installed with HPSCR devices, how to verify the performance parameters of their sub-type engines without installing HPSCR devices during the workshop bench test of their sub-type engines has become a major issue for marine use. A difficult problem and challenge in the production process of low-speed diesel engine

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