Graphite heat exchanger resistant to hydrofluoric acid corrosion
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We are a manufacturer of waste heat refrigeration equipment, and we are currently facing a difficult problem. We are designing a piece of equipment for a fiberglass company; since the flue gases generated during glass melting contain large amounts of hydrofluoric acid, traditional heat exchangers are unable to recover this waste heat. We plan to use graphite heat exchangers; I was wondering if any expert could offer some advice. For the heat exchanger, we want it to be able to withstand a pressure of 1.8 MPa; I’m not sure if there are any graphite heat exchangers that can meet this requirement. There really isn’t any, so we can use a heat exchanger with a pressure of 0.8 MPa for the conversion.
Hydrofluoric acid is highly corrosive and has a significant impact on glass. Graphite heat exchangers are also not very ideal. You can consider high-performance plastic heat exchangers made of fluorine materials. As long as the temperature does not exceed 200°C, it can withstand 0.8 MPa without issue. If you want to know more, I can help you design a plan. 13869142933
The concentration of hydrofluoric acid is very important; a pressure resistance of 0.8 MPa is sufficient.
Graphite cannot withstand high pressures; nickel-based materials can be used instead
Eight kilograms, 200 degrees – a graphite heat exchanger works fine for this. Just contact me – 13698674969.
The pressure resistance of graphite heat exchangers has always been a challenge. As far as I know, domestic manufacturers can currently achieve only 0.6 MPa; it’s possible that some manufacturers possess certain core technologies that allow them to reach 0.8 MPa, but this is not certain. Abroad, I’m aware of a company named Capron Roland that is an expert in graphite equipment; their graphite heat exchangers can withstand pressures of up to 1.6 MPa. In fact, whether graphite equipment can withstand pressure depends primarily on the particle size of the graphite. In China, particle sizes of φ2mm are commonly used, while graphite equipment manufactured by Capton Roland that can withstand a pressure of 1.6MPa uses particle sizes of φ0.8mm; there are even those with particle sizes as small as φ0.02mm. Graphite equipment made with this particle size experiences only a slight increase in weight when impregnated with phenolic resin; the small gaps between the graphite particles enable it to withstand higher pressures. Domestic graphite manufacturers use equipment made with φ2mm particles, and in such cases the weight increase during impregnation reaches 12-15%. Additionally, the choice of graphite equipment is also closely related to your HF concentration.
We have used plate heat exchangers made of Hastelloy B.
Graphite heat exchangers capable of withstanding such high pressures are probably not feasible to produce in China; there are very few manufacturers in the country that can make high-quality graphite heat exchangers. If the hot flue gas contains no moisture, carbon steel can be used directly
Is graphite equipment more cost-effective compared to equipment made from other materials?