Selection of pipeline materials for gas stations
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For the current two-stage coal-to-gas project, the design temperature of the gas pipeline is 560°; what material should be used? According to the pipe grade table available now, 1.6k2 (06Cr18Ni11Ti) can only be used based on the design temperature; are there any other options? ? Since I’m not very familiar with coal-to-gas projects, I would appreciate some guidance from those who are experienced in this area. Thank you very much
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The pressure in these pipelines is generally very low; cast iron pipes are used in many projects, as it would be wasteful to use high-alloy steel.
What is the diameter, what is the flow rate, and what is the pressure? Gas pipelines are generally quite thick. I have worked with furnaces having a diameter of 2600. The most cost-effective approach is to use welded carbon steel pipes – that is, ordinary carbon steel with a refractory lining on the inside and insulation material on the outside. I hope this helps you
Diameters ranging from DN500 to 1400 are available. The temperature of the gas coming out from the bottom of the gas generator is around 550°C. Is there any relevant design basis for what you mentioned, namely using ‘rolled and welded carbon steel pipes, lined with refractory material and covered with insulation material’? ? Could you explain it in detail?
However, the temperature of the gas coming out of the bottom of the gas generator is 550°C – can ordinary carbon steel pipes withstand such high temperatures? ?
Carbon steel definitely cannot withstand 550°C; it can’t even handle 450°C. The method on the 4th floor works; in fact, many people do it this way. But actually, 321 is also a good choice; since the temperature is below 600, it’s not necessary to use refractory lining materials. I haven’t compared the investments between the two; construction and maintenance are definitely easier for 321.
There should be a basis for it; I haven’t paid attention to checking information on this aspect. You can check it out – cast steel requires a temperature of 425°C, and it’s difficult to ensure the same conditions for pipes. Take a look at other stainless steels and alloy steels as well. I still recommend doing a cost estimate to see which option is more economical and cost-effective, as your demand is high, so the costs are likely to be significant.
15CRMO or 15CRMOG will do; 304H is also acceptable.
It is feasible to line the interior of carbon steel pipes with refractory bricks; for specific details, refer to the rising pipes in the coke oven roof. The temperature of the coke oven gas before cooling should be around 700 degrees
Well, thank you for your reply; I’ve learned something new!