A question about salt dissolving
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This post was last edited by sunjl1981 on 2013-1-6 at 20:58. Here, I would like to ask some experts a question regarding the water temperature in the salt dissolution tank. During the initial testing with brine, salt dissolution was carried out using bottom-water distribution; since no steam was used for heating at the beginning, cold water was employed for this purpose. As a result, the feed pump couldn’t deliver water into the salt dissolution tank. As far as I understand, temperature only affects the speed of salt dissolution and the concentration of the brine, and it determines merely the amount of time required for the crystals to dissolve. What I want to know is whether temperature also has an impact on crystal deposition in the pipes Could you explain in detail why hot water doesn’t cause blockages while cold water does? ， ， -
The debugging season is winter; if there are any possible reasons that come to mind, you can also write them down
Your company is really creative – there’s no steam even, so what’s the point of using it? You need to check whether the valves along the way are open; it’s hard to tell with new installations whether some valves might not have been turned on. Also, check whether the pump is operating properly and what the temperature is Logically, it shouldn’t get clogged even with cold water; it can’t be that the water can’t get through
Reply to 1# Qingfeng Xulai0.0: Could it be that the water is too cold, causing the raw salt to recrystallize into large crystals that block the water pipes? Just joking, it’s unlikely. But it cannot be ruled out either. Heating the salt is done to increase the rate of salt dissolution, so that the brine can reach saturation within a limited time. If salt is dissolved using cold water, the dissolution rate of the raw salt is very slow, making it difficult to achieve saturation at the outlet of the salt-dissolving tank. If the brine solution is not heated, it is greatly affected by temperature, and the quality of the brine also becomes unstable. Carefully check the pipelines to see if they are blocked, if the valves are not open, or if the blind flanges have not been removed.
The last edit to this post was made by Qingfeng Xulai0.0 on 2011-1-12 at 12:23; reply to 3# flay0303: I didn’t attend the session where water was added. It seems that the water was heated, and once a tank was filled, the process stopped. Perhaps it cooled down later… and no more water could be added
Reply to 4# huawei: Both the pipelines and valves are in good condition. I managed to unclog them later by finding a solution, but it took a lot of effort. I’m wondering if there’s any quick way to deal with pipeline blockages, as if they get blocked during production, it could cause serious problems. The pipeline is a rubber-lined pipe and cannot be exposed to steam directly
The solubility of salt is little affected by temperature. A fellow sailor told me that hot saltwater tends to crystallize when cooled, which can lead to blockages; I’m not sure if this is the reason One more question: if the feed pump ahead stops or the flow rate is low, is it possible for salt to mix with brine and flow back into the pipes, causing blockages?
Reply to 7# Qingfeng Xulai0.0: I was right after all when I joked about it. It has crystallized. Although temperature has a minor effect on solubility, saltwater in a saturated state is in a solid-liquid phase; it will crystallize at the slightest drop in temperature, especially since you have left it for such a long time. It must crystallize, right? However, the crystals shouldn’t all become completely solidified. I’m not sure what the structure of the water distribution device in your salt dissolving tanks is like; if it has a bacterial cover, it’s unlikely that the crystals will solidify completely. I suspect you’ve created small spray holes in the water distribution pipes
Reply to 5# Qingfeng Xulai0.0: If that’s the case, it’s likely that the water pipe is blocked. Perhaps the outlet valve wasn’t closed or wasn’t closed properly during the pump shutdown; the sudden drop in pressure after shutdown caused the salt particles to be sucked back, leading to the blockage. We’ve encountered this issue when starting up the equipment as well, and it was resolved by using flushing water. Generally, several flushing pipelines are designed for such purposes. We always require that the outlet valve be closed slowly, and only after it’s fully closed should the pump be shut down. And after stopping, the pump is restarted every few hours to check for overflow; just in case, it’s a bit troublesome if this area gets blocked
Reply to 8# huawei: No bacteria growth, holes were made directly
Reply to 9# flay0303: Thanks for sharing your experience; we’ll pay more attention to it in the future