Process parameters at the outlet of the atmospheric pressure furnace
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This post was last edited by 691855517 on 2013-1-3 at 10:30. The exit temperature of a furnace under normal pressure is usually around 360 degrees, with a pressure of around 0.2 MPa. The equilibrium gasification fraction of the outlet, as calculated using Aspen, corresponds to a mass gasification fraction of approximately 0.37. What is the typical flow rate at the outlet of the heating furnace?
950-1500kg/m2×s
Thank you. The parameter for mass flow rate can be found, but I’m not sure if there are any reference values available for velocity. The value I obtained by calculating it based on the vaporization rate seems a bit high; a gas-liquid mixing velocity of 60 m/s doesn’t seem reasonable. Additionally, the volume fraction is also quite high. I wonder if there are any reliable values available for reference in industry.
This post was last edited by zhai*aoh on 2013-1-3 01:22. An exit speed of 60 m/s is available in large-scale installations. The quality flow rate specified by the old domestic standards is too low, resulting in extremely low furnace temperatures in traditionally designed atmospheric and vacuum distillation furnaces in China, at around only 600°C. The manager, who didn’t understand the situation, still praised it, saying that operating at such a temperature was safe: lol. He had no idea how much more expensive each furnace was as a result The previous 2 million tons per year atmospheric and vacuum distillation units could have their capacity increased to 3.5 million tons per year with just a few modifications! How much wealth has been silently wasted on the ground for over a decade or two! Conversely, such furnaces are indeed unsafe, as they form coke quickly and have a short coke removal cycle. At present, domestic atmospheric-pressure furnaces with a capacity of 10 million tons per year generally use foreign processes; the temperature at the bridge and wall areas is around 830°C, the mass flow rate is approximately 1650 kg/(m2·s), and the exit flow velocity is about 60 m/s, as mentioned by the original poster.
What is the flow rate of the mixture at the outlet of the pressure reduction furnace? Thank you!
I’m not familiar with this either; it can be estimated based on mass flow rate and vaporization rate. You can take a look at the paper titled “Simulation of Gas-Liquid Two-Phase Flow Characteristics and Structural Optimization of the Pressure-Reduction Oil Transfer Line”; the inlet of this oil transfer line is the outlet of the pressure-reduction furnace.