LNG storage tank flash vapor volume
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Gentlemen, the 5000-capacity LNG storage tank uses pearlescent sand for insulation; its main component is methane at 74%, with the remainder being ethane and other substances. The inlet temperature is around -165. How much flash vapor can such a storage tank produce per hour, and is there much variation throughout the four seasons?
The evaporation rate of a storage tank is influenced by many factors and is not a fixed value. Generally speaking, when the liquid level is moderate, with neither liquid entering nor leaving the tank, the evaporation rate is usually sufficient to meet the design requirements. For a tank with a capacity of 5,000 cubic meters, the evaporation rate should be around 2,000 to 3,000 cubic meters per day. Both too low and too high liquid levels increase the rate of evaporation; loading and unloading operations also increase evaporation. Compared to unloading, loading has a lesser impact on the rate of evaporation. If 30 to 30 trucks of liquid are loaded and unloaded per day, the evaporation volume should be around 20,000 cubic meters.
The liquid level in the storage tank is currently stable at around 2 meters; there is no inflow or outflow of liquid, and no loading takes place. The theoretical flash volume calculated based on the process parameters is around 2000 cubic meters, but I don’t think it will be that much.
The daily flash evaporation rate is generally around 0.1%. 5000 * 0.1% = 5 cubic meters of LNG, which is equivalent to 3000 standard cubic meters of natural gas; 2000 cubic meters seems to be an underestimate