What is the function of the Texaco oxygen high-value selector?

Does it mean to use a higher value for the oxygen flow rate? This is done to ensure system safety and prevent excess oxygen in the system. Using a higher value for oxygen allows the coal slurry flow rate to be increased, thereby avoiding situations where a low coal slurry flow rate could lead to excessive oxygen in the system.

What was said upstairs is absolutely correct; using a higher value for the oxygen flow rate and a lower value for the slurry flow rate are both aimed at preventing excess oxygen. In the cross-coupling control of oxygen-to-coal ratio, if the oxygen flow rate increases, a higher coal slurry flow rate is applied accordingly ； As the coal slurry flow decreases, the oxygen flow follows with a lower value.

High-value selection is a type of selection method for control systems; it mainly refers to the level of the signal sent by the regulating mechanism, which should be related to the state of the actuator – whether it is air-operated or pneumatically closed – and selection and control are carried out in conjunction with the process requirements

The Texaco software package contains detailed instructions, and the operating procedures should also have specific explanations

The high-value selector is intended to ensure the accuracy of oxygen flow detection. The ultimate goal is to prevent peroxides.

The high-value selector mentioned by the poster should be one that controls the load crossover force. The current volume flow rate of oxygen, after being adjusted for temperature and pressure as well as purity, is divided by the set value of the oxygen-to-coal ratio; this calculation yields the corresponding slurry flow rate at that oxygen flow rate. This value, along with the load signal (which is actually a value representing the slurry flow rate), is fed into the high-value selector, which outputs a high value that serves as the remote setpoint for adjusting the slurry flow rate. In other words, when the oxygen flow rate is high and the calculated slurry flow rate is also greater than the slurry flow rate specified by the load, the higher value is sent to the slurry pump speed controller, which increases the speed of the slurry pump and thereby raises the flow rate to prevent excess oxygen. In addition, there is a low-value selector; among the three values obtained from the slurry measurement, the middle value is selected along with the load signal and fed into this selector, from which the low value is output. This low value is then multiplied by the oxygen-to-coal ratio in a multiplier to determine the oxygen value corresponding to the current slurry flow rate, which serves as the remote setpoint for regulating the oxygen flow rate. In other words, the reduction in load value is achieved through high-value and low-value selectors: to increase the load, coal is added first followed by oxygen; to decrease the load, oxygen is reduced first followed by coal

What was said upstairs is absolutely correct; it’s mainly to prevent peroxides.

When loading a gasifier, should coal slurry be added first or oxygen first?

Loading the load is done by first adding coal slurry and then oxygen； To reduce the load, oxygen is reduced first, followed by coal slurry.

This post was last edited by Comrade Lao Li on 2009-6-20 at 18:26. What is the function and principle of the high selector in the Texaco oxygen pipeline? Please give me some advice!