Abstract
We in order to study the influence of intake parameters on the combustion and emission of natural gas-diesel dual-fuel Marine engine, AVL_FIRE simulation software was used to build a high pressure cycle model of combustion chamber based on 4190ZLC-2 Marine medium-speed diesel engine. The accuracy of the model was verified by comparing the simulation data with the cylinder pressure curve obtained from bench test. The influence of intake parameters on combustion and emission performance was studied by model simulation. The results show that the combustion quality can be improved by increasing the intake temperature, and the power performance and economy can be improved by appropriate intake temperature. Increasing the intake pressure has the effect of supercharging, appropriately increasing the intake pressure can obtain better power and emission, and can also avoid the rough operation of dual-fuel diesel engine and reduce the noise
Highlights
We in order to cope with the worsening global environment and the continuous shortage of fossil resources, the emission of Marine diesel engine has caused global environmental problems, so people turn to the gas-diesel dual-fuel engine [1]
Gas-diesel dual fuel engines have been widely used on ships [3]
German MAN Diesel & Turbo in 2012 launched the ME - GI type natural Gas - Diesel dual fuel engine, the circulating high pressure direct injection Diesel technology, replacement rate is as high as 97%, using
Summary
We in order to cope with the worsening global environment and the continuous shortage of fossil resources, the emission of Marine diesel engine has caused global environmental problems, so people turn to the gas-diesel dual-fuel engine [1]. The dual-fuel diesel engine of Wartsila of Finland adopts low-pressure direct injection in cylinder and "micro-ignition" technology, which can realize full-load operation, with the replacement rate of natural gas reaching 95%-99% and HC emission greatly reduced [6]. Domestic pan jianfeng et al [7] Established a two-dimensional simulation calculation model by using FLUENT, and studied the influence of fuel injection duration and natural gas substitution rate on the combustion process of dual-fuel diesel engines. Wang limin et al [8] Studied the influence of different loads, natural gas substitution rate and excess air coefficient on combustion characteristics of dual-fuel engines by using test bench. Zhang ning et al [9] Built a CFD Computational Fluid Dynamics three-dimensional jet model for dual-fuel diesel engines and studied the influence of EGR rate on the comprehensive performance of high-pressure direct jet engines. This paper starts with the main operating parameters of dual-fuel diesel engines, and adopts model simulation to study the combustion variation characteristics and pollutant generation rules in cylinder under different operating parameters, so as to provide a basis for the development of dual-fuel diesel engines
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