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The hydrogen cooling unit does not use carbon dioxide as a coolant. The hydrogen cooling unit uses water or pure hydrogen as the primary cooling medium to reduce the temperature of the generator set. Carbon dioxide is a common greenhouse gas and it is not possible to use it as a direct substitute for water or pure hydrogen to cool generators. Under high temperature and pressure conditions, carbon dioxide exhibits instability and poor thermal conductivity.
What impact does the ventilation and cooling method of the hydroelectric power station generator set have on the layout of the generator stage of the factory building?
There are two cooling methods for diesel generator sets. : air cooling and water cooling.
1. Mewind cooling method:
The wind cooling method uses air as a cooling medium to transfer heat from the heated parts of the diesel engine. This cooling method consists of cooling. fan and guide cover, etc.
In order to increase heat dissipation neps, many corrugated fins are usually cast on the outer walls of the cylinder block, cylinder head and each radiator. During operation, the fan rotates to circulate air along the air guide cover to the surface of the cylinder block and cylinder head. As cold air passes through the heat sink, it carries away heat from the cylinder block and cylinder head.
The air-cooled cooling system has a simple structure and small weight, but the cooling effect is poor. It is mainly used in small diesel engines and is suitable forx areas lacking water.
2. Water Cooling Method:
The water cooling method uses water as a cooling medium to transfer heat from the heated parts of the diesel engine. The characteristic of this cooling method is that it is easy to adjust the cooling intensity when the temperature or workload changes.
There are two types of water cooling methods: open type and closed type. In an open cooling system, the circulating water is directly connected to the atmosphere and the steam pressure in the cooling system is always maintained at atmospheric pressure. In a closed system, water circulates in the closed system and the vapor pressure of the cooling system is greater than atmospheric pressure. As the temperature difference between the cooling water temperature and the outside air temperatureieur increases, the heat dissipation capacity of the assembly. the cooling system is improved.
The cooling of synchronous generators is divided into two types: external cooling and internal cooling.
1. External cooling: including air cooling and hydrogen cooling.
Air Cooling: The cooling medium is air, i.e. air is used to carry away the heat generated due to losses in the generator. This method has a simple structure, but the cooling efficiency is not high. The maximum installed capacity can reach around 100 MW.
Hydrogen cooling: The cooling medium is hydrogen, that is, hydrogen is used to remove heat. High cooling capacity compared to air. The ventilation loss is low, but the structure is complex and requireshydrogen storage equipment. The maximum installed capacity can reach around 200 MW.
2. Internal cooling: including stator internal water cooling, rotor internal hydrogen cooling, etc.
Internal cooling (direct cooling method): the cooling medium is water, oil or hydrogen, that is, hydrogen, Water or oil passes through the inside of the wire to carry heat away directly from it. the two surface cooling methods mentioned above. High cooling capacity can reduce the size of the generator, save materials and facilitate the manufacturing of large capacity generators. However, the generator structure is complex and made of copper. The loss is larger, the iron loss and mechanical loss are smaller, and the total loss is almost the same.