A marine dual-fuel/gas engine gas multi-point multi-stage injection system

Abstract

The invention relates to the field of fuel injection devices and control, in particular to a marine dual-fuel / gas engine multipoint multi-stage injection system. The marine dual-fuel / gas engine multipoint multi-stage injection system comprises an air cylinder, an intake valve, an intake manifold, an exhaust valve, an exhaust manifold, a gas collector, an injection valve block, a pressure stabilizing cavity, an air rail pipe, a gas pressure sensor, a gas temperature sensor, a pressure regulator, an on-off solenoid valve, a filter, a gas storage unit, a control system and a lambda sensor. The injection valve block can be used to solve problems about development, modification and matching of dual-fuel or gas engines, gas supply requirements for high flow under high load and high revolution speed and small flow under low load of the engines can be met, gas injection control precision of the dual-fuel / gas engines is increased, fuel distribution uniformity of different cylinders is improved, and thus dynamic property, economical efficiency and emission performance of the engines are improved.

Description

technical field [0001] The invention relates to the field of fuel injection devices and controls, in particular to a multi-point multi-stage fuel gas injection system for a marine dual-fuel / gas engine. Background technique [0002] With the depletion of traditional fossil energy, a high-quality alternative fuel - natural gas is gradually being valued by countries all over the world. The dual-fuel / gas multi-point injection engine is a form of technical application of alternative energy sources. At present, there are still many technical problems to be solved. First, due to the large number of diesel engine models and wide power ranges in existing ships, the existing diesel engine It is impossible to use the existing single jet valve in the market to match each type of engine when carrying out dual-fuel transformation; secondly, the dual-fuel / gas multi-point injection engine requires the gas supply system to be able to operate in a short time under high-load and high-speed con...

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Problems solved by technology

[0004] Compared with single-point injection, the above-mentioned patents have the advantages of high control accuracy, better economy and lower emissions. However, when using a separate injection valve for each cylinder to supply air, it is impossible to take into account both the high-speed and heavy-load conditions of the engine and the low-speed The gas injection flow rate and precision requirements in light load conditions make the engine economy and emission worse

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