The main fuel for diesel engines is diesel. Light diesel is used in high-speed diesel engines. Heavy diesel is used in medium and low speed diesel engines, and heavy fuel oil is used in large scale low speed diesel engines.
1 Air cooling uses wind as the cooling fluid. cooling and directly uses the wind for. cool the diesel generator. Water cooling uses water as a cooling medium. Then the heat is dissipated through a water tank and an electric fan. There isn't much difference in usage. suitable for plateaus or places where water is scarce or cold. You don't need to consider adding water, boiling point, freezing and other issues; When water cooling is used on trays, the boiling point of water decreases and it is easy to do so. freeze during arnot in high altitude locations. The boiling point and freezing point can be improved by adding a certain proportion of additives. In addition, the heat transfer performance of water is better. In fact, there are virtually no constraints on environmental conditions when using them.
2. The biggest advantage of air-cooled unit is its simple structure, easy maintenance, low failure rate, good starting performance, small amount of air required, easier shutdown, high thermal efficiency and its low fan power. consumption and low fuel consumption. Low, there is no risk of frost cracking or overheating and boiling, but it is subject to thermal load and mechanical load constraints, and the power is generally relatively small. The water cooling system problem accounts for more thanhalf of the total fault share of diesel generator set. Air-cooled units do better. The biggest advantage of a water-cooled generator is its high efficiency and rapid cooling. At the same time, the power conversion rate of the body itself is improved.
3. The air-cooled cylinder block and cylinder liner are integrated or assembled into one without gap. The interior is the working area where the piston slides, and the exterior is densely distributed heat sinks in a uniform and orderly manner, which are usually die-cast with materials with high thermal conductivity. The working heat of the piston is directly transmitted through the cylinder and is. carried away by the air flowing between the heat sinks, this method is generally used on two-stroke engines; the water-cooled engine has a complex cooling water channel (cooling linerdry cylinder) cast in the cylinder, or a cooling water channel (wet cylinder liner) is formed with the cylinder liner and the piston is in the cylinder liner. During operation, heat is transferred to the cooling water in the water channel through the cylinder liner for cooling. This method is generally used on four-stroke engines. Air-cooled generators are generally low power and do not generate large amounts of heat, so air cooling is sufficient; High power generators require water cooling due to their high calorific value.
4. The air-cooled generator from the generator manufacturer has high thermal efficiency and economy. Since the air-cooled diesel generator transfers less heat to the air, its cooling air volume is only about 2/3 ofthat of the water-cooled diesel engine. This is because when the gas temperature of an air-cooled diesel engine is constant, the higher the cylinder wall temperature, the less heat the diesel engine dissipates into the air, the higher the thermal efficiency, the lower the fuel consumption, the better. the economy. Generally, the cylinder wall temperature of an air-cooled diesel engine is tens of degrees higher than that of a water-cooled diesel engine, so its thermal efficiency is higher than that of a diesel engine. water cooled.
5. Air-cooled generators from the generator manufacturer have a long service life. The air-cooled diesel engine heats up quickly due to the high temperature of the cylinder walls, which greatly avoids acid corrosion and wear. the duration of operation of the diesel engine below the dew point. Therefore, the pAir-cooled diesel engine parts exhibit less corrosion, cavitation and rust, and there is no inconvenience of scale accumulation in the cylinder cover and radiator. Long service life. It can be seen that the air-cooled diesel engine has good drivability, short warm-up time and simple suggestions, eliminating the burden of increasing cooling water and releasing cooling water, and There is no need to worry about damage accidents of the cylinder block, cylinder head, radiator, etc. due to frost cracking, so it has high reliability in use, few defects, long service life, easy protection and maintenance.
How does hydrogen flow in a hydrogen cooled generator?
Dual water internal cooling generator uses water, water and air. The generator stator and rotor windingsuse water. internal cooling. , the stator core and end structure adopt air cooling. The cooling water for the stator windings has one water channel for each half-coil. The water inlet is at the excitation end of the stator and the water outlet is at the machine end. The stator connection pipe is also water-cooled, and the water inlet and outlet of each water channel are connected by polytetraethylene pipes. The rotor winding cooling water path has two rows per rotor slot. Each row of spools is a path of water that enters at the bottom of the thread bin and exits at the top of the bin. water channels are connected to insulated water pipes. The main inlet and outlet pipes are made of anti-corrosion and anti-magnetic stainless steel pipes. Cooling water enters the rotor through the excitation end andflows along the hollow axis in the center of the rotor. When the cooling water passes through the end water collection box and the water inlet pipe, it flows to the rotor winding and flows out. the rotor water outlet pipe and the water outlet device. Cooling air is supplied by a fan installed on the rotating shaft of the generator and forms a closed circulation system with the air cooler. Cold air is driven from the end cover air inlets at both ends by installed axial fans. at both ends of the rotating shaft and passes through the surface of the rotor and the stator. The iron core adopts a two-inlet, two-outlet radial ventilation method.
Which generator fan is used to dissipate. heat?
Hydrogen only circulates in the generator chamber. There are generally four cold air chambers and five hot air chambers (four inlets andfive outlets, cold air entering and hot air leaving, taking 200 MW as an example). to produce electricity. There is usually a powder-coated fan on the end of the generator rotor, which rotates with the rotor during operation. These two fans blow cold air (hydrogen) cooled by the hydrogen cooler to the four corners of the generator in the space. between the generator stator and the rotor cavity, then exits, passes through the hot and cold air chambers in sequence, and after reaching the middle hot air chamber, exits from outside the stator chamber, then is cooled by all four. -cooler corner to start a new cycle.
Hydrogen is produced by electrolysis of water in an electrolyser in a hydrogen station. If the generator leaks hydrogen or other factors cause low hydrogen pressure, the main hydrogen pipe of the hydrogen station can be refilled.viewed. If the purity of the hydrogen does not meet standards, the hydrogen is vented from the generator to the atmosphere.
Hydrogen-cooled generators use hydrogen gas to cool the generator rotor.
(1) in the picture is an expansion joint, and the muffler is connected to the expansion joint. This part is used to discharge high temperature and high pressure exhaust gas generated by the diesel engine. atmosphere;
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(2) Pictured is the air-cooled radiator of the diesel engine. If I read it correctly, this diesel generator should be the forced air cooled type. This type of diesel engine has a closed cooling water circulation system. When the diesel engine is running, the heat generated by the cylinder liner and other components as well as the lubricating oil system is cooled by the cooling water which absorbs the cooling wateris lying. the heat is cooled by the forced air cooling radiator. The cooled cooling water is then cooled by the cooling water to cool the machine, and so on. justIn normal operation, the cooling water temperature is stable between 75 and 85 degrees. If it exceeds 90 degrees, an alarm sounds. If it exceeds 95 degrees, it will stop, otherwise the diesel engine will be damaged.