The relationship between the precision of thermal power generation and air quality flow rates
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Hello, friends! Good! Currently, there are many modifications made to steam power plants regarding the maintenance of vacuum in the condensers. It is often difficult to calculate the amount of air that leaks into the condensers. Apart from the parameters of the condensers, power plants can generally only provide information on the vacuum integrity, but they cannot specify the exact amount of air that leaks in. For example: Condenser volume: 1000 m3; Tightness (leak rate): 200 Pa/min; Vacuum level: -0.095 MpaG; Power generation capacity: 300 MW (for illustration). In the event of a leak, it is definitely an air leak, but it is not possible to calculate how many kilograms of air leak per hour. The formulas provided by the U.S. HEI standard and the methods found online yield significantly large discrepancies; how should I calculate the amount of air that leaks in, in kg/h?
Hello! For thermal power plants, air leakage is one of the key factors affecting the vacuum level of the condenser. Based on the information you provided, we can use the following formula to roughly calculate the amount of air that leaks in: Air flow rate = Volume × (pressure difference/absolute pressure) × 0.0417 × γ, where the volume is in cubic meters ； The pressure difference, expressed in Pa, can be calculated from the vacuum level of the condenser and atmospheric pressure ； Absolute pressure is equal to atmospheric pressure plus the vacuum level of the condenser, expressed in Pa ； γ is the density of air, in units of kg/m³. This formula is an approximate one, with a large error. You can use it for preliminary calculations first, but it’s better to employ other more accurate methods to determine the amount of air that has leaked in. If you have questions about the specific calculation methods, it is recommended that you consult engineers or technical advisors in the relevant field. -
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