Comparison of chimney schemes

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The first option has never been used in our construction projects. As for the second option, many of the chimneys we’ve built utilize this approach. Therefore, we recommend going with the second option. The application of fireproof lining paint proves to be more advantageous than the first option, both during construction and in actual use

Actually, if you have the money, it’s best to use a titanium inner-chamber chimney. Other construction methods tend to have problems to some extent, as it is difficult to control the construction quality during implementation.

The first solution proposed by the original poster, which involves using a fiberglass inner cylinder, does not exist in practice. If a pre-made fiberglass inner cylinder can withstand corrosion, heat, and sudden temperature changes, then why use a concrete outer cylinder? Moreover, what about the installation of a pre-made fiberglass inner cylinder as a whole? I wonder if the original poster meant a concrete cylindrical wall with a fiberglass lining. If that’s the case, then it depends on what kind of chimney it is—information such as the range and frequency of temperature changes must be considered. Not every chimney can be fitted with a fiberglass lining. Fiberglass does have its advantages, but its disadvantages and drawbacks are also hard to avoid. In the field of corrosion protection for chimneys today, there are a wide variety of methods available; titanium, which is very expensive, is used in some cases, while cheaper coating solutions are also employed. It depends on what kind of chimney you have, how long its service life needs to be, and what other requirements there are. Sometimes, it is indeed necessary to use expensive titanium for the inner cylinder. Briefly discuss the most commonly used solutions in the market today: 1) Metal inner cylinder + organic anti-corrosion coating. Note that the metal used here is not expensive titanium; if it were titanium, there would be no need for an organic anti-corrosion layer at all. Most of the organic anti-corrosion coatings here are made of acid- and temperature-resistant mortar ； 2) Direct clay lining corrosion protection ； 3) Underlayment + barrier layer + acid-resistant block material + mortar grouting – this is the method most commonly used these days, right? ； 4) KPI putty – there are also many types available on the market ； 5) Anti-corrosion coatings applied in thin layers can also be useful, but they are mostly suited for applications where a long service life is not required, and where low tolerance to temperature and sudden temperature changes is sufficient. Those interested in participating in the discussion on this topic are invited to join the thermosetting resin section of the professional anti-corrosion forum www.51fangfu.com to engage in the discussions.

What was said upstairs is correct, but it’s somewhat one-sided in some aspects; I won’t go into detail about the points that are worth acknowledging. The installation of fiberglass-reinforced plastic linings inside chimneys first originated in Sweden, using vinyl resin composite materials. Several prefabricated modules are used for this purpose; each module is about 12 meters tall. These modules are lowered into the chimney using cranes and fitted around the entire chimney. The upper and lower parts of each fiberglass module are equipped with mating connectors that allow them to be connected together. The sockets are fixed using high-temperature adhesive, and then welded by skilled welders. I’m a professional in chimney anti-corrosion, and I’m glad to discuss and learn from everyone!

It depends on whether your chimney handles flue gas that has been desulfurized, and whether there is a device for heating the flue gas before it is released; if so, then it’s fine. If not, fiberglass is the best choice, but measures to reduce the temperature of the flue gas as it enters the chimney via a bypass need to be considered.

It’s great to see such expert and knowledgeable remarks. It’s too high; lifting and bonding can be done in China, I mean done with 100% safety, but only large companies like yours can do that. As far as I know, in either 2005 or 2006, there was an accident in China where a fiberglass chimney being lifted caused a fatality. I’m not exactly sure of the details; at that time I wasn’t in China, and I only heard about it from friends back home. Therefore, lifting such a heavy and tall structure is indeed no easy task at all.

If the company has the funds, titanium alloy is still the recommended choice. To be honest, with other methods, once wet flue gas desulfurization is implemented, it’s only a matter of time before corrosion occurs in the chimney.

Reply to 5# Ouyang2018: Hello. First of all, thank you for your participation. However, the first solution is indeed already in use – it’s being applied at the Fuchunjiang Thermal Power Plant as well as in Tongling. In Tongling, it’s used in that double-flashing project, and the fiberglass used is one that can withstand temperatures of 120 degrees.

Reply to 8# Ouyang2018: Thank you for your comment. I hope we’ll have the chance to meet and discuss learning together, so as to make progress together