tag:blogger.com,1999:blog-555835656466815511.post6539381440240270496..comments2023-08-21T08:55:54.875-05:00Comments on Peter Reviews Products & Procedures: Fukushima: Gaseous Effluent Handling & Hydrogen ExplosionsPeter Melzerhttp://www.blogger.com/profile/10404231990274257867noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-555835656466815511.post-27913439050406045292014-09-27T02:12:33.120-05:002014-09-27T02:12:33.120-05:00I read your blog. Its simply superb. useful for PV...I read your blog. Its simply superb. useful for <b>PVC Pipes & Fittings Manufacturer </b> Thanks for sharing<br /><br /><a href="http://www.shandgroup.com/upvc_swrpipe.php%E2%80%9D%20title=" rel="nofollow">Plastic Pipe Exporters</a>Anonymoushttps://www.blogger.com/profile/17226890863498632822noreply@blogger.comtag:blogger.com,1999:blog-555835656466815511.post-19720898261747826042014-06-07T15:11:56.006-05:002014-06-07T15:11:56.006-05:00Too true and Count Zeppelin was aware of the poten...Too true and Count Zeppelin was aware of the potential risk. My father told me the Count had originally used helium in his dirigibles. However, because the allies had imposed an embargo on helium after WWI, he resorted to hydrogen instead with the known catastrophic consequences. My father concluded had it not been for the Kaiser's war, we might be traveling in dirigibles across the Atlantic today, :). Peter Melzerhttps://www.blogger.com/profile/10404231990274257867noreply@blogger.comtag:blogger.com,1999:blog-555835656466815511.post-18448305593950839562014-06-07T11:31:44.643-05:002014-06-07T11:31:44.643-05:00I agree Peter. A higher air change rate for the wh...I agree Peter. A higher air change rate for the whole building driven by natural convection would in deed help. Not because hydrogen is transported quicker but because the hydrogen-air mixture would be kept at a better - ideally non-inflammable - ratio.<br /><br />I think for the technical aspects a look to the old Zeppelin airships might be helpful. They also used internal stacks in the gas management system to prevent inflammable gas mixtures. The technology was already quite advanced in those old days. However there were still actidents (most famous: the Hindenburg) that showed that even these well designed venting systems could fail.<br /><br />The underlying issue is that however you design a gas management system - as long as you keep potentially inflammable gas mixtures within a closed room for a while there is the risk of a katastrophic event.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-555835656466815511.post-29240961081778386652014-06-07T10:13:03.266-05:002014-06-07T10:13:03.266-05:00Thanks for your insightful comments. My hypothesis...Thanks for your insightful comments. My hypothesis was that an improved draft in the tall stacks might passively increase the volume of air pulled through the reactor buildings’ HVAC systems up to the level otherwise maintained with power-driven fans and blowers, enhancing the rate of hydrogen diffusion and elimination from the buildings. <br />Peter Melzerhttps://www.blogger.com/profile/10404231990274257867noreply@blogger.comtag:blogger.com,1999:blog-555835656466815511.post-13142445186359639762014-06-06T19:03:30.621-05:002014-06-06T19:03:30.621-05:00Hydrogen does not generate a big draft in a stack ...Hydrogen does not generate a big draft in a stack like thermal convection because of its high diffusion speed. This results in hydrogen outflow not causing a significant lower pressure that could accelerate venting.<br />So, the thoughput is mainly driven by diffusion, that is a function of the cross-section. Hence the only thing that helps is increasing the smallest cross-section of the whole system. If that is the stack is not clear. Could also be some other tubing or even the filters...Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-555835656466815511.post-26444124586527775632013-11-22T09:33:19.979-06:002013-11-22T09:33:19.979-06:00Higher stack wouldn't help here. A shorter, wi...Higher stack wouldn't help here. A shorter, wider stack would have actually been better. (Though worse for the workers on site.)<br /><br />It's venting light gasses from a pressurised container, with no natural draught required or used at all. (There is no convection, nor intake of fresh air at the base of the stack.)Anonymousnoreply@blogger.com