Project Generation (System Simulation) After establishing the preliminary analysis model of the air separation plant, it is necessary to verify whether the model can be consistent with the actual air separation equipment variable load conditions. So what method we use is the most effective? This is the simulation technology. Using simulation technology, not only can the model be validated and confirmed, but also the transient response and control performance of the air separation system can be further understood and verified. After the analysis model is established, what are the steps of simulation on the computer? The first is to prepare the simulation software, the analysis model is compiled into the program on the computer; the second verification and recognition model, the purpose of this step is to verify the simulation model and the actual Whether the system is consistent to confirm the correctness of the analytical model; the third operational simulation model, experimenting with the response of the system under different conditions and parameters or predicting the response of various decision variables. From the above simulation process, we can see that it is not a one-time calculation and solution process, but a repeated operation process. In addition, the process of validating and validating the model is actually continually modifying the model to make it more realistic, so the simulation is essentially a continuation of the modeling process.

The dynamic test analysis model performs dynamic test of the system on the target object of the air separation device, and uses the historical database of DCS to realize the record of the second level of dynamic test data. Through the effective analysis of a large number of dynamic test data, the system is modified as necessary until a variable load control technology that meets the process requirements is established.

In order to achieve variable load control, several significant measures must be taken on the design and instrumentation to ensure load adjustment: the performance of the air compressor can avoid entering the anti-surge zone during low load operation, and the inlet guide vanes should have good Controls speed and smoothness.

Since the full rectification argon extraction process requires a particularly high stability to the operating pressure of the main column, the nitrogen content at the argon fraction of the upper column is critical to the argon rectification conditions. For example, when the amount of process air fluctuates in a short period of time, the gas-liquid ratio of the lower tower changes, which will affect the liquid-liquid purity of the lower tower and the liquid air volume of the upper tower, thereby affecting the rectification conditions of the upper tower, so that The tapping of the argon fraction is shifted, resulting in a change in the nitrogen content of the argon fraction.

The relationship between the fraction content and the tray is to control the nitrogen content and ensure the extraction rate of argon. Generally, the outlet of the argon fraction is designed to be between 3,540 trays. When the operating conditions fluctuate, the outlet of the argon fraction may shift to the left or to the right. When the mouth is shifted to the right, although the nitrogen content is basically unchanged, the argon content of the argon fraction will decrease, which will affect the extraction rate of argon; when the mouth is shifted to the left, the nitrogen content will increase sharply. Nitrogen plugging is easy to occur. It can be seen that one of the keys to variable load control is to ensure the stability of the rectification working conditions when the load changes.

Then, when the load changes, how to ensure the stability of the rectification condition, a large number of process calculations must be carried out to find out the various units of the air separation process, such as air compressor, expander, heat exchange, main tower and argon tower. Operational response. Analyze the key factors affecting the rectification conditions and product purity, such as the amount of raw air, the amount of expanded air, the amount of air entering the tower, the amount of expanded air entering the tower, the purity of the liquid in the lower tower, and the amount of liquid in the lower tower. , upper tower pressure, lower tower pressure, upper tower liquid-gas ratio, lower tower liquid-gas ratio, upper tower composition, lower tower composition, etc. And these factors are fully analyzed to determine which factors must be effectively controlled when the load changes, otherwise it will destroy the working conditions, which is commonly referred to as the controlled amount.

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