Cascade control of the outlet temperature of the reformation furnace
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Regarding the method for regulating the outlet temperature of the reforming four-in-one furnace, is it better to use cascade control based on both the furnace outlet temperature and the furnace chamber temperature, or is cascade control based on the furnace outlet temperature and the fuel gas flow rate better? In the case of cascade control, how are the primary and secondary controllers determined, and how are they put into use?
I’m using cascade control based on the furnace outlet temperature and fuel pressure; it seems impossible to get good control over the furnace temperature
So what is the typical pressure level before and after the fuel pressure valve?
I’m using cascade control for the furnace outlet temperature and fuel pressure here. The furnace temperature is greatly influenced by the composition of the fuel gas, weather conditions, the amount of circulating hydrogen, and the aromatic potential of the feed material; it is therefore difficult to control. The pressure in the fuel gas buffer tank here is 0.33 MPa
The fuel composition must be the factor with the greatest impact! By the way, I would like to ask what factors affect the oxygen level monitored in your four-in-one furnace
The fuel gas has the greatest impact, followed by the feed aromatic vapor; weather changes such as wind also have an effect, with the first two furnaces being more affected than the latter two, and the furnace temperature fluctuates by around 10 degrees. Then, the combustion condition of the burner also has a significant impact
So, what is the typical oxygen level maintained in your four-in-one furnace? How much oxygen will be left in the flue gas after combustion? The thermal efficiency of the furnace as calculated by us is likely to be around that level
The oxygen content should be maintained between 2.7 and 2