LNG接收站冷排水的温降及余氯对水环境影响的数值模拟——以湄洲湾东吴港区为例

摘要: LNG接收站运行过程中将冷排水排放到海域水体中,冷排水的温降及余氯对附近海域水环境的温度场和生物环境产生影响。为掌握冷排水在海域水体中的扩散规律,利用二维水动力-水质数值耦合模型(MIKE21),采用模型嵌套的方式精细化模拟了湄洲湾东吴港区LNG接收站冷排水对水环境的影响,在模型验证可靠的基础上,计算得到了LNG接收站冷排水在冬季、夏季的温降包络线及余氯包络线,从而判断该工程位置选取的合理性。结果表明:在温降大于0.5 ℃条件下,LNG接收站的冷排水影响范围为0.202 km²,距离湄洲岛生态系统重点保护区约2.81 km,距离最近的养殖区约0.53 km;在余氯浓度为0.01 mg/L条件下,LNG接收站的冷排水中余氯影响范围为0.434 km²,最大影响距离为0.628 km;LNG接收站冷排水的温降及余氯均未对周边敏感目标产生直接影响,该排水口位置选择合理。
- LNG接收站 /
- 冷排水 /
- MIKE21 /
- 温降 /
- 余氯
Abstract: During the operation of LNG receiving station, the cold water is discharged into the sea. The temperature drop of the cold water and the residual chlorine have an effect on the temperature field of the water environment and the biological environment of the nearby sea area. In order to understand the diffusion law of cold water discharge in sea water, the effects of LNG cold water discharge on water environment in Dongwu port area of Meizhou Bay were simulated by means of two-dimensional hydrodynamics-water quality numerical coupling model (MIKE21) and nested models. On the basis of reliable model verification, the temperature drop envelope and residual chlorine envelope of LNG cold drainage in winter and summer were calculated,so as to judge the rationality of selecting the project location. The results showed that under the condition of temperature drop greater than 0.5 ℃, the cold drainage influence range of LNG receiving station was 0.202 km², which was about 2.81 km from Meizhou Bay ecosystem reserve and 0.53 km from the nearest breeding area. When the residual chlorine concentration was 0.01 mg/L, the residual chlorine influence range was 0.434 km² and the maximum influence distance was 0.628 km. The temperature drop and residual chlorine of cold water from LNG receiving station had no direct influence on the sensitive targets around the receiving station, and the location of the water outlet was reasonable.
- LNG receiving station /
- cold drainage /
- MIKE21 /
- temperature drop /
- residual chlorine

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