Double-layer gas delivery system for multi-point intake dual-fuel engine

Abstract

The invention provides a double-layer fuel gas conveying system of a multipoint gas inlet dual-fuel engine. The double-layer fuel gas conveying system comprises a double-layer fuel gas main tube (3), a double-layer drainage tube (6) and a fuel gas injection valve (8). An inner layer tube and an outer layer tube of the double-layer fuel gas main tube (3) are in sealing connection with an inner layer tube and an outer layer tube at the inlet end of the double-layer drainage tube (6) respectively, an inner layer tube at the outlet end of the double-layer drainage tube (6) is disconnected or connected with a nozzle (9) through the fuel gas injection valve (8), the inner layer tube and the outer layer tube of the double-layer fuel gas main tube (3) are communicated with an inner layer tube and an outer layer tube of the double-layer drainage tube (6) respectively, and the inner layer tube and the outer layer tube of the double-layer fuel gas main tube (3) and the inner layer tube and the outer layer tube of the double-layer drainage tube (6) are both isolated from each other. By means of the double-layer fuel gas conveying system of the multipoint gas inlet dual-fuel engine, fuel gas leakage can be effectively avoided, the phenomenon that after leaked fuel gas is gathered to reach certain concentration, potential safety hazards happen is also avoided, so that the safety and reliability of the fuel gas conveying system of the dual-fuel engine are improved, and the security coefficient of the engine can be better improved.

Description

technical field [0001] The invention relates to the technical field of fuel engines, in particular to a double-layer gas delivery system for a multi-point intake dual-fuel engine. Background technique [0002] With the transformation of marine engine dual-fuel technology and the increasing use of liquefied natural gas (LNG) in domestic shipping, the market prospect of marine dual-fuel engines is very promising. Commonly used dual-fuel engines mainly have two main gas intake methods: single-point premixed intake and multi-point injection intake. Existing dual-fuel engines mostly adopt a single-point premixed air intake method, but the use of this air intake method will cause a large amount of gas wasted by scavenging, and the engine is prone to backfiring, etc., resulting in poor engine safety. The multi-point injection air intake method can effectively solve the above problems, greatly improving the economy and safety of the engine. [0003] However, the gas delivery syste...

AI Technical Summary

Problems solved by technology

[0003] However, the gas delivery system of the existing multi-point intake dual-fuel engine is a single-layer pipe gas delivery pipeline system, and gas leakage is easy to occur when using this single-layer pipe structure to deliver gas. The space is limited. In the limited cabin space, the leaked gas is easy to gather. When the gas in the cabin accumulates to a certain concentration, once it encounters a fire source or high temperature, it is very easy to cause a fire or even an explosion, which threatens the engine and the entire gas. Conveyor System Safety

Therefore, the gas delivery system of the existing multi-point intake dual-fuel engine has relatively large potential safety hazards, and cannot guarantee the safety and reliability of gas delivery.

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