Adjustable intake and exhaust device of marine medium-speed diesel engine

Abstract

The invention discloses an adjustable intake and exhaust device of a marine medium-speed diesel engine. The adjustable intake and exhaust device of the marine medium-speed diesel engine comprises a compressor air supply system, a pressurized air bypass system and a waste gas bypass system, the compressor air supply system comprises a first electromagnetic switch valve, a three-way valve A, a second electromagnetic switch valve and a pressure-adjustable one-way valve, the pressurized air bypass system comprises a three-way valve B, a pressure sensor, a first electric control ball valve, a firstone-way valve and a three-way valve C, and the waste gas bypass system comprises a second electric control ball valve, a second one-way valve, a third one-way valve and a three-way valve E. Accordingto the adjustable intake and exhaust device of the marine medium-speed diesel engine, the air supply amount can be increased, and the black smoke emitting problem of the marine medium-speed diesel engine is solved; when a ship runs in cold regions such as an ice region, the waste gas bypass system can prevent a pressurizer from surging, and the running efficiency of the diesel engine is greatly improved; and meanwhile, when the diesel engine is loaded by 20%-80%, the pressurized air can be bypassed in real time according to the air-fuel ratio condition, and the partial load performance of thediesel engine is further improved.

Description

technical field [0001] The invention relates to an intake and exhaust device for a diesel engine, especially an intake and exhaust device for avoiding surge of a turbocharger and improving the operating efficiency of a marine medium-speed diesel engine (rotating speed 300≤n≤4000r / min), which belongs to diesel engine technology field. Background technique [0002] Ship transportation is favored by the majority of users for its large load capacity and low transportation cost. As the most important material transportation tool, it brings great convenience to people's production and life. As the heart of the ship, the marine medium-speed diesel engine has also been greatly developed. At present, all marine engines adopt turbocharging technology to increase the air intake of the diesel engine, thereby increasing the power and torque of the diesel engine. However, under normal circumstances, the supercharger is mainly aimed at the matching optimization of certain fixed operating...

AI Technical Summary

Problems solved by technology

However, under normal circumstances, the supercharger is mainly aimed at the matching optimization of certain fixed operating conditions. When the diesel engine is in low-load and starting conditions, it often causes black smoke from the diesel engine; at the same time, when the external temperature is low (such as ice area), the energy of the exhaust gas is too high, causing the supercharger to overspeed and surge, which seriously affects the performance of the diesel engine and poses a safety hazard

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