Diesel and methanol dual-fuel engine system for inland river offshore ship

The invention relates to an inland river offshore ship diesel oil and methanol dual-fuel engine system which comprises a cylinder body, a methanol box, a methanol filter, a brushless alcohol-resistant pump, a methanol ECU (Electronic Control Unit) control module, a methanol sprayer, a diesel oil nozzle and an exhaust gas recirculation device, the methanol box is connected with the methanol filter, the methanol filter is connected with the brushless alcohol-resistant pump, and the brushless alcohol-resistant pump is connected with the methanol ECU control module. The brushless alcohol-resistant pump is connected with the pressure limiting valve, the pressure limiting valve is connected with the alcohol sprayer, the methanol ECU control module is connected with the exhaust gas recirculation device, the brushless alcohol-resistant pump and the alcohol sprayer, the methanol box is used for storing methanol, the methanol filter is used for filtering impurities in the methanol, the brushless alcohol-resistant pump