How do the conventional submarines inhale and exhaust under water?
The water depth of 8 - 15 meters, the bridge in the submarine or submarine underwater air suction device - cylinder diesel engine combustion air supply. By the end of the bridge underwater exhaust exhaust. The two devices are unidirectional, preventing sea water from coming back
In addition to the intake and exhaust systems, the closed cycle diesel engine (CCD/AIP) has the same operating principle as the conventional diesel engines used by conventional power submarines. Its working principle is: use the submarine with oxygen instead of oxygen in the air, the carbon dioxide in the exhaust gas after cooling and absorbed back into the boat, CO2 as a refrigerant in the cycle; at the same time to replace the nitrogen in the air with hydrogen, improve the combustion quality of circulating gas. The specific work flow is: the cylinder of oxygen and hydrogen mixed in proportion into gas input to the diesel equivalent air components in diesel and then reacts to oxygen, generated heat to push the piston moves to drive the crankshaft, produce mechanical energy. The exhaust gas is discharged from the diesel engine at a temperature of about 350-400 DEG C, mainly consisting of carbon dioxide, water vapor, argon, and partial oxygen. The waste gases are cooled by spraying the cooler to about 100 DEG C, wherein the water vapor is cooled into water, and the residual gas is absorbed into an absorber. Carbon dioxide is absorbed and absorbed by the absorber's spray sea water and discharged from the boat by the sea water management system.
At present, the AIP system of conventional submarine can be divided into two major categories: thermal engine system and electrochemical system. The engine AIP system mainly includes the closed cycle diesel engine (CCD/AIP), Stryn (SE/AIP), closed cycle turbine (MESMA/AIP), nuclear power hybrid propulsion system (SSN/AIP); electrochemical AIP system is mainly for polymer electrolyte membrane fuel cell (PEM /AIP), including alkaline fuel cells, proton exchange membrane fuel cell. But at present the foreign technology is more mature, and has entered the practical stage, can greatly improve the submarine combat capability under the water AIP system is mainly the closed cycle diesel engine, Stryn, closed cycle turbine and fuel cell of the four. Some of these AIP systems have been successfully tested, and some have been equipped with new submarines
An air independent propulsion system (AIP) is an energy system in which the submarine does not depend on the outside air and provides propulsion and other power. Conventional submarine AIP (Air Independent Propulsion) system is mainly used to carry their own oxygen (usually oxygen), provide conditions for the combustion engine or electrochemical power generation device, energy conversion, propulsion power required to provide underwater navigation
