The large chimney of a nuclear power plant is not a real chimney, but a cooling tower. Large power plants generate a huge amount of heat, but can only use about half of it.
The power plant must dissipate the remaining heat to avoid melting, so it dissipates heat to the external environment. If there is a large enough river nearby, use river water.
Alternatively, dissipate the heat by building large chimney-like cooling towers and then vaporizing the water. Yes, these chimneys produce steam and humidity, but not smoke or radiation. Cooling towers are built so that this steam can be cooled and then recovered for future use in machines and turbines.
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Then the main circulation pump transports the coolant to the reactor for recycling, thus forming a loop. This process is the energy conversion process of converting nuclear fission energy into thermal energy.
The thermal energy released by the enthalpy drop of the steam is converted into mechanical energy of rotation of the steam turbine rotor. The steam that did the work is condensed into condensed water in the condenser and returned. to the steam generator to form an aother cycle.
Baidu Encyclopedia - Hyperbolic Cooling Tower
Baidu Encyclopedia - Nuclear Power Plant
The ventilation of the diesel generator room includes two parts, normal ventilation and work ventilation.
Daily ventilation: the number of ventilations in the engine room of air-cooled and water-cooled generators should be 6 times, and the number of ventilations in the oil storage room should not be less than 3 times. For computer rooms that use gas fire suppression systems, after a fire, this ventilation system is responsible for exhausting indoor exhaust gases, but it is not accidental ventilation. To ensure personal safety, it is recommended to set the start button for accidental ventilation.
Working ventilation: water-cooled diesel generators must consider the quantity of air required for oxygen consumption in operation; Air-cooled generators have a large volume of cooling air and generally use a natural air intake. Diesel engines have their own fan. pressure emissions, but diesel generators The pressure height of the built-in fan is only about 150 Pa. When the shaft resistance is large, a fan should be added to overcome the shaft resistance. the air inlet shaft is large, an air inlet fan is added; if the exhaust shaft resistance is large, an exhaust fan is added.
The diesel generator room uses a gas fire extinguishing system. Solenoid valves should be installed on the air inlet and exhaust channels. When a fire occurs in the diesel generator room and gas fire extinguishing is triggered, these valves will be closed. in a stringto ensure the extinguishing effect.
Diesel generator exhaust is a pressurized exhaust with high combustion gas temperature and high air flow velocity. Combustion gases must be vented at high altitude. The flue must be thermally insulated and fitted with a shock-absorbing support. should be installed.
The diesel generator room should pay attention to ventilation and smoke exhaust, otherwise it will affect the use of the generator. Damage to the generator is a very bad thing for an enterprise that cannot not afford a power outage.