Gasification Daily Question: 2016-12-10 Process Analysis Question (5 points for participation, 10 points for a correct answer)
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Gasification Daily Question: 12-10-2016 – Process analysis question (5 points for participation, 10 points for a correct answer). What material should be used for the oxygen pipelines in the burner section of a fluidized bed gasifier? Why is this material chosen? What are the reasons behind it?
The material of oxygen pipelines should be selected based on factors such as the pressure and temperature of the oxygen, as well as its flow rate within the pipeline. For oxygen pipelines with a working pressure greater than 3 megapascals, brass or copper tubes are used, while for those with a pressure less than 3 megapascals, seamless steel tubes are generally employed
According to the oxygen station specifications, copper pipes and stainless steel pipes can be used
304h, high-temperature resistant, corrosion-resistant
CO50, whose full name is UMCo 50, is a cobalt-based alloy that boasts heat resistance. It is suitable for applications where oxidation resistance is required, along with certain high-temperature strength, as well as resistance to thermal corrosion, thermal shock, and wear. In sulfur-containing oxidizing atmospheres, it exhibits excellent resistance to thermal corrosion in media resulting from the combustion of heavy oil or other fuels. It is widely used in nozzles for coal chemical processes, as well as as heat-resistant sliders and protective sleeves for high-temperature measuring instruments.
Inconel 625, a high-nickel alloy with high strength and heat resistance
Compressed high-pressure oxygen is characterized by high purity, high temperature, and fast gas flow rates; it tends to react chemically with elements such as hydrogen, iron, and carbon present in ordinary carbon steel. Therefore, high-pressure oxygen pipelines must be made of stainless steel, especially those used for transporting high-pressure, high-purity oxygen. In China, it is stipulated that the flow rate of oxygen in these pipelines should be below 10 m/s, primarily because high flow rates can cause pipelines made of materials less resistant than stainless steel to oxidize or even burn. For high-purity oxygen pipelines with flow rates above 10 m/s, materials more resistant than stainless steel must be used.