What is the ramp curve of a valve?
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After changes occur in the important operating parameters of the reaction system, the ramp curve of the lock hopper compensation valve should be adjusted according to the operating conditions. The ramp curve of the lock hopper compensation valve referred to here is presumably part of the catalyst regeneration control system; I would like to know what exactly this ramp curve means Does it refer to the time it takes for the valve to reach a certain position? Are there 2D curves?
Are you referring to that in catalytic reforming? Is the ramp curve of the closed hopper compensation valve designed to close within 30 seconds? If so, it should be an interlocked valve closure; due to temperature changes, the valve does not close immediately, and there is a mathematical formula that takes into account the changes in the material.
Moderator **! As shown in the figure, there’s a sentence in the summary; I don’t understand what this sloping curve represents :(
Is the poster talking about the charring curve of the regeneration unit in the reforming unit? ! The charring curve determines the oxygen content based on the amount of catalyst coking and the maximum circulation rate, in accordance with the CCR general operating curve. The bed temperature is generally controlled at 490–565°C, with coking taking place in the coking zone. Assuming a constant oxygen concentration, a stable charring curve is established in accordance with UOP requirements. The figure below is a general curve chart for reference only.
Good idea. This curve determines the maximum cycling rate of the catalyst, that is, the number of cycles per unit time in the closed hopper; it can directly affect the valves. Our oxygen content is not set based on this curve – it is determined by the level of charring temperature and the position of the peak temperature, and is controlled through cascade control with the lower air valve. This charring curve is used solely to determine the maximum cycling rate