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第709章 做不出来也是白搭

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    第709章做不出来也是白搭(第1/2页)
    这个电站是河口核电站,位于河流入海口潮间带生态与咸淡水混合的敏感区。受潮汐和径流双重影响,盐度、水温波动大,生态系统复杂且脆弱。
    还有滨海核电站,直接临海,取水和排水均与开阔海域连通,受洋流和潮汐影响较大。
    甚至有近岸核电站,位于人口密集的近岸区域,常毗邻城市或港口,受陆源污染和航运干扰较大。取水容易受城市污水、农业径流等陆源污染影响。
    程时:“你们能想到这一点,真的很有超前意识。首先,核电站温排水对海洋生态的影响具有复杂性和累积性,是一个长期的过程。不仅体现在生物个体层面,也不仅仅是影响局部和表层,而是会通过食物链传递和生态系统功能退化影响很大范围,多层次、多维度,长时间的影响。”
    “比如水温升高会显著改变海洋生物的酶活性和代谢速率,导致鱼死亡和畸形,影响繁殖能力,寄生虫感染率变高。”
    “冬天,核电站温排水形成的“暖池”虽吸引鱼类越冬,但是夏天却会因为水温过高而导致产卵率下降,珊瑚死亡,浮游生物的种类减少。单个品种藻类泛滥。还可能吸引外来物种入侵和聚集。”
    “这些都会导致生物群落结构的改变,食物链改变,鱼类变小。而且因为珊瑚这些具有碳汇能力的生物死亡减少,导致海洋酸化加剧,溶解氧饱和度下降,富营养化加速。水质恶化。”
    “反过来,海洋生物也会影响核电站的运行。”
    “比如水母、海藻、贝类大规模聚集可能导致取水口过滤设备失效,引发冷却系统故障。单次清理成本修复高,还可能威胁电网稳定性。生物如藤壶、牡蛎的附着,会形成生物膜,加速金属管道腐蚀。这跟远洋游轮外壳附着生物造成的影响相似。”
    那人说:“这个我听说过。漂亮国的核电站就因为蛤蜊堵塞安全冷却水管路,导致含铜壳体腐蚀泄漏,修复费用超过千万美刀。”
    程时说:“既然是两个问题那就有两套方法。我先讲这个生物防治。因为明年夏天,你们说不定就会遇见这个问题了。而水温造成的生态影响会慢一点显现。”
    “你们的取水口防护网设计是什么样的。”
    立刻有人递了图纸过来,介绍说:“我们的取水口参考火电行业经验,设置了取水涵管、联接井、闸门、栏污栅、取水隧道、旋转滤网。旋转滤网作为核心防护设备来拦截大型杂物如树枝、渔网和防止海生物堵塞管道。”
    火电厂为了冷却的需求也会修在海边或者河边湖边。
    程时看了看,说:“如果海浪大,水压大,浮冰冲击。泥沙堆积等情况下,可能会出现缝隙,让海洋生物进入管道和渠道。这个设计就没有充分考虑我提的这些情况。这也是水泵里泥沙多,导致循环水泵断轴、叶轮冲刷等问题的原因。”
    (本章未完,请点击下一页继续阅读)第709章做不出来也是白搭(第2/2页)
    那人点头:“是,一般淡水流域的泥沙,浪潮没有那么大。”
    程时:“所以我有个改造建议,实施起来也不难。现在你们选的取水口在海湾里,本来是为了避开风浪,同时也避免被敌对分子破坏。但是离河流入海口太近,属于泥沙富集区。增加了防泥沙淤积的难度。而且河流会带来大量富营养物质。比如工厂城市排出的污水,农田里山林冲下来的腐殖质。这些都会造成藻类繁生。”
    “所以我建议你们,有条件的话,把取水口深入到更开阔的海域去,远离近岸淤积带。”
    那人:“主要是安全问题。如果设在离核电站太远的地方,不能24小时看到,就怕有人往里面加什么东西。你知道的,核电站要发生爆炸,后果不堪设想。”
    程时想了想:“也是。”
    现在没有24小时监控,纯靠人眼睛盯着。
    他说:“那就只能利用潮流设计导流结构,借助自然水流带走部分泥沙。这个可以结合数学和物理模型,来模拟漂浮物轨迹,优化取水明渠导流堤结构,减少进入管道的生物。增加一道滤网。还有定期用吸沙船、高压水枪冲洗来清除取水口周边和内部沉积泥沙。”
    “还有就是在设备上增加过滤网差压、水泵振动等参数变化触发自动报警。”
    “关于这个滤网上附着泥沙藻类,生物的问题,其实可以定期反向冲洗。选择其他材质的滤网。甚至考虑柔性滤网。”
    “说回到刚才的那个生物堵塞富集防治。其实可以用化学抑制。用氧化性杀虫剂和非氧化性杀生剂结合。非氧化性杀生剂,比如次氯酸钠,能快速杀灭浮游生物。非氧化性杀生剂,有异噻唑啉酮,可以杀灭藤壶幼虫等宏观生物,这些都是海洋友好型杀虫剂,不会影响别的生物。”
    有人疑惑地说:“这个也跟机械有关系?”
    程时:“造船和一些长期在海里停留的金属构件时,也要考虑这些的。还有好几种方法,能减小生物附着。比如在外壳表面涂上有机硅自释放涂层。有机硅本身比较光滑,让海洋生物难以附着,即便附着也能被浪冲下来,或者后期轻松脱离。而且有机硅跟沙子的结构相似,不会污染海洋。不容易被海水腐蚀,有效期长。”
    有人问:“这个有机硅涂层该去哪里买。”
    程时叹息:“你又问到最让我痛苦和伤脑筋的问题了。”
    会场里的人忍不住笑了起来。
    东西再好,知道原理,做不出来也是白搭。
    程时等大家笑完了才说:“那我们就一步一步来分析可行性。有机硅自释放涂层的基础材料为聚二甲基硅氧烷简称为PDMS。首先以二甲基二氯硅烷为主要原料,在酸性或碱性条件下水解生成硅醇中间体。中国已经有化工厂能做到万吨级甲基氯硅烷单体生产。所以这一步没有问题。”

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