Material selection for the inlet pipeline of the drying tower
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After purification and washing, the flue gas is sent to the drying tower; at the same time, sulfur dioxide is introduced back into the inlet of the drying tower via a fan. For production safety, what material should be used for the pipes at the inlet of the drying tower?
A steel-lined PO pipe will do. Features: Operating temperature of -20° to 85°, resistant to acids, alkalis, and salts of various concentrations, anti-static, non-toxic, high strength, pressure range of 0.25 MPa
Our carbon steel shell is lined with tiles.
Could you be more detailed? The temperature of the return gas from the sulfur dioxide fan is around 120–150°C; the gas contains acid mist, and fiberglass material is not resistant to corrosion by concentrated acids. The negative pressure at the inlet of the drying tower is approximately -20 kPa; the steel pipe is lined with fluorine, but there are bulges in the tetrafluoroethylene lining inside.
The bulging issue of PTFE that the poster is concerned about is likely to be uncommon; it can be considered a manufacturing defect. In my opinion, under the conditions mentioned by the poster – a temperature of 150 degrees and a negative pressure of around -20 kPa – there should be no problems with either PTFE or spraying techniques
Hard PVC pipes or fiberglass-reinforced plastic pipes can be used; however, for the gas pipes downstream of the drying tower, Q235 steel pipes are suitable, as the gas after drying, as well as the inlet and outlet pipelines of the SO2 fans, are all made of Q235 steel pipes.
We use fiberglass pipes here; they’ve been in use for 6 years. Last time they were cut open due to some issue, and they looked in good condition. PVC material is also acceptable.
You can just use carbon steel pipes directly