Calculation of the air intake flow rate for deaerators
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“The temperature in the deaerator is continuously controlled by a temperature controller, with steam being injected into the feed water using installed spray nozzles. The steam flow to the feed water is restricted based on the actual temperature of the feed water in the tank, thereby preventing steam vibration, especially during tank heating. Therefore, the maximum opening degree of the injection valve is calculated based on the difference between the actual temperature and the saturation temperature. ” What is this algorithm supposed to do?? And what exactly is meant by steam vibration? Thank you all
The steam flow rate in the deaerator is calculated based on the saturated temperature at that control pressure. The water fed into the deaerator generally comes from several sources: some is return water from the condenser, some is return water from the high-pressure heater, and some is make-up water for desalination; there are also smaller amounts of water from other sources (such as return water from the slag cooler). The amount of steam required is determined by heating this water to its saturated state at the operating pressure.