Problems with wet flue gas desulfurization slurry pipelines
Thread Content
Is it possible to use PVC chemical pipes? Currently, the temperature of the slurry is 30 degrees in winter; if it reaches 60 degrees in summer, it’s hard to say how well PVC pipes will perform
For wet flue gas desulfurization, I’ve never seen PVC being used for the slurry pipelines to date. PVC pipes become too brittle in cold regions during winter, and they vibrate whenever the pipelines are in operation; over time, the welds on plastic pipes crack. In the past, the requirements for wet flue gas desulfurization weren’t strict, and carbon steel was used for the circulation pipelines, but these pipes would deteriorate over time. Eventually, steel-lined pipes were used, but installing such pipes requires high standards and results in higher costs； What I come into contact with most often these days are fiberglass-reinforced plastic pipes; both the calcium method and the ammonia method use such pipes. They have a low density, high strength, good corrosion resistance, and most importantly, a long service life ；
Either rubber-lined carbon steel or stainless steel is acceptable
There are many rubber-lined pipes, and they offer good cost-performance. PVC can’t be used; it will cause problems when in use.
In our company, fiberglass is the most commonly used material in construction, followed by rubber-lined pipes. The reason for this is probably what was mentioned on the first floor! Because I work in instrument installation and don’t understand process design
Fiberglass is still more common, as most manufacturers approve of it; steel is also an option. Now, with the drop in steel prices, more people might choose the former
Fiberglass reinforced plastic pipes are the preferred choice, followed by carbon steel pipes lined with rubber or plastic. FRP pipes have few flanges, while pipes with rubber or plastic linings have many flanges; the design dimensions must be highly precise, otherwise large dimensional differences after lining will prevent proper installation
Using corrosion-resistant materials such as PVC for the lining is fine, but the framework still needs to be made of high-strength carbon steel or fiberglass! PVC is extremely brittle at low temperatures.
Generally, rubber lining is used more often for carbon steel; at least that’s how I make my choices. As for PVC, it’s better to avoid it; if it has to be used, then UPVC should be chosen, as it’s suitable for use in environments with acids and chemicals
Fiberglass is the preferred choice~~~~~~~~~