Dual-fuel engine combustion system and method based on switchable type oil sprayer

Abstract

The invention discloses a dual-fuel engine combustion system and method based on a switchable type oil sprayer. The dual-fuel engine combustion system is characterized in that an electronic control common-rail diesel supply device, a premix natural gas supply device and the switchable type oil sprayer are connected with an electronic control system ECU, and the switchable type oil sprayer is installed on a dual-fuel engine and further connected with the electronic control common-rail diesel supply device. The dual-fuel engine combustion system and method have the advantages that the mixed gas flow, the mixed gas concentration, the diesel supply pressure and spraying timing of two spraying nozzles are controlled through an electronic control system, the sprayer covers the whole substitution rate range of the dual-fuel engine, the diesel spraying atomization quality of the dual-fuel engine is improved, and the overall performance of the dual-fuel engine is optimized.

Description

technical field [0001] The invention belongs to the technical field of dual-fuel engines, and in particular relates to a dual-fuel engine combustion system and method based on a switchable fuel injector. Background technique [0002] In recent years, with the increasingly stringent emission regulations and excessive energy consumption, natural gas as an alternative fuel has attracted more and more attention due to its advantages in emissions and reserves. Compared with ignited natural gas engines, diesel ignited natural gas engines can increase the combustion speed without sacrificing emissions and ensure power performance, which is an important application direction of natural gas engines. [0003] The technical scheme of the dual-fuel engine is: in the late stage of the compression stroke, a small amount of diesel oil is pre-injected as an ignition source, and after the diesel jet is ignited, multiple fire nuclei are formed at different positions in the combustion chamber,...

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Problems solved by technology

Therefore, the amount of diesel oil varies greatly under different working conditions, especially in the pure diesel mode and the working condition with high replacement rate, it is necessary for the injector to adapt to a wider flow range and achieve a better injection effect in the entire operating range , there is currently no injector that can cover the entire operating range, resulting in the replacement rate of natural gas being limited by the injector and cannot be too low, so the current dual-fuel engine performance optimization has limitations

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