MXA81A-004-503-00自动化
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日立的“下风式”设备指的是什么
而日立的差异化战略则表现在风车的工作方式上。此次日立从富士重工获得的风力发电设备属于全球罕见的“下风式”,这种类型的风力发电站十分适合海上风力发电。下面就详细介绍一下这种方式。
风力发电设备是在塔架上设置装有发电机及动力传输机等的名为“机舱”(Nacelle)的壳体,并在其前方(上风向)安装发电桨叶。这被称为“上风(UpWind)式”。风力发电普遍采用这种方式的原因是,风首先会吹向风车,然后再吹向机舱和塔架,因此风车转动时很少会受到塔架干扰气流的影响。
而下风式设备的机舱位于上风向,风车在塔架的后侧转动。虽然风车会受到塔架干扰气流的影响,但该方式也有很大的优点,那就是可有效利用在崎岖的山地经常刮起的自下而上风。
为了避免桨叶在被强风刮弯时相互碰撞,上风式风车的桨叶旋转面需要稍微朝向上方。下风式风车不存在这种问题,所以风车的旋转面可以正对着来风方向设置。富士重工为了开发出适合日本(山地较多)的风车,选择了全世界使用较少的下风式。通过流体力学方面的改进,克服了塔架造成的气流干扰。
日立认为,这种下风式设备能够在浮体式海上风力发电方面发挥优势。浮体式海上风力发电是指在漂浮在海面的设备上设置风车的方式。水深超过40m时,这种方式与在海底建造底座的“着床式海上风力发电”方式相比,成本方面比较有利。浅海区域较少的日本主要采用浮体式风力发电。已启动发电项目的福岛海域的水深达到了100m,只能选择浮体式。
海上刮起的风是与海面平行的。但采用浮体式时,被强风一吹,塔架会稍向下风向倾斜。因此,采用上风式设备时,风叶的旋转面会稍朝向上方。但采用下风式设备的话,可正对着来风方向设置,能够提高将风能转换为电能的效率。海上风力发电的设备利用率比陆上风力发电高出10个百分点左右。因此,效率稍高一点就能对提高发电量作出巨大贡献。
以欧洲为中心,海上风力发电主要采用着床式。旋转的风车全部由西门子等欧洲厂商生产。如果日本在投资回报率较高的浮体式风力业务方面获得成功,主要采用日本产风车的日本市场就会扩大,甚至有可能逆转欧洲市场的情况。目前,亚洲也纷纷上马海上风力发电项目。如果海上风力发电成本降低,市场扩大至全世界,浮体式发电的潜在市场就会超过着床式。
在日本处于领先地位的太阳能电池领域,技术方面的差异化很难实现,日本企业在中国企业强大的成本竞争力面前被迫陷入苦战。要避免在风力发电领域重蹈覆辙,就要坚持贯彻其他公司无法模仿的技术差异化战略。
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