Fuel oil/gas control and switching system of dual-fuel internal combustion engine

Abstract

The invention discloses a fuel oil / gas control and switching system of a dual-fuel internal combustion engine. The fuel oil / gas control and switching system of the dual-fuel internal combustion engine comprises a fuel oil / gas control valve, a fuel gas automatic pressure adjustment valve and intake manifolds, wherein the fuel oil / gas control valve and the fuel gas automatic pressure adjustment valve are connected by a control pipe line; the intake manifolds are communicated with an inlet header pipe and used for providing each cylinder of the internal combustion engine with fuel gas; each intake manifold is provided with a single-cylinder fuel gas control valve; each single-cylinder fuel gas control valve is connected with a single-cylinder fuel gas spray nozzle; the inlet header pipe is connected with a fuel gas pipe through the fuel gas automatic pressure adjustment valve; the fuel oil / gas control valve enables the relative position of a spool to be changed under the push-pull action of a fuel oil control rod of a high pressure oil pump of the internal combustion engine; through the control pipe line, the slow-opening quick-closing type on-off action of the fuel gas automatic pressure adjustment valve is realized; and therefore, the automatic adjustment and the switching of fuel oil and the fuel gas in the situations of load increase or sudden shutdown of the internal combustion engine, stable load, fuel gas interruption and fuel gas supply recovery are achieved.

Description

technical field [0001] The invention relates to the control technology of two fuels of a dual-fuel internal combustion engine, in particular to a fuel oil and gas control and conversion system of a dual-fuel internal combustion engine. Background technique [0002] At present, due to the rising price of light fuel oil and the requirements of environmental protection, the country actively promotes alternative fuels that are environmentally friendly and energy-saving, and especially advocates the use of dual-fuel internal combustion engines to replace light fuel internal combustion engines in the future to reduce the operating costs of ships and generator sets. Reduce NOx emissions. Major shipping companies also urgently need to adopt dual-fuel internal combustion engines in order to strive to meet national environmental protection requirements. [0003] Judging from the current development status of various internal combustion engine companies, most of them adopt the pre-mix...

AI Technical Summary

Problems solved by technology

This mixing method has great disadvantages: firstly, this mixing method has a great potential safety hazard, because there is a large amount of mixed gas stored in the intake box, and the mixed gas and the combustion chamber are separated by the intake valve, for multi-cylinder internal combustion engines , it is difficult to ensure that each intake valve is sealed during operation. If individual intake valves are not tightly sealed, flames will flow backward into the intake box, causing the entire intake box to explode, which may threaten the turbine. life of persons and safety of ships

The use of Heinsmann's control system has several weaknesses: 1. Since Heinsmann's control system is in a monopoly position in China, its price remains high, which adds a high cost to the development of dual-fuel engines

2. The gas-controlled high-speed solenoid valve has a short service life, and generally only needs to be replaced after one and a half years of use, which will add a lot of burden to future use and maintenance

3. The replacement rate of gas does not meet the requirements. At present, it can only replace 80%, and it is difficult to achieve a replacement rate of more than 90%.

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