How is the working pressure of the pressure swing adsorption nitrogen generator precisely adjusted?
The precise adjustment of the working pressure of the pressure swing adsorption nitrogen generator mainly relies on advanced control systems, high-precision valves, and stable gas sources. The specific methods are as follows:
Based on precise control by the control system.
Precise pressure sensor monitoring: High-precision pressure sensors are installed at key parts of the nitrogen generator, such as the inlet, adsorption tower, and outlet. These sensors can accurately detect pressure changes in real time, with an accuracy of ±0.01 MPa or even higher. The sensors convert pressure signals into electrical signals and transmit them to the control system.
PID control algorithm: The control system uses the Proportional-Integral-Derivative (PID) control algorithm. It calculates and outputs control signals based on the deviation between the actual pressure value and the set pressure value, precisely adjusting the opening degree of relevant valves or other control parameters to keep the pressure near the set value. For example, when the actual pressure is lower than the set value, the PID controller will output signals to increase the opening degree of the inlet valve or reduce the opening degree of the outlet valve, causing the pressure to rise; conversely, it performs the opposite operation. Through continuous adjustment and optimization, precise pressure control is achieved, with a control accuracy of ±0.05 MPa or less.
Intelligent control system: Some advanced nitrogen generators are equipped with intelligent control systems, which have self-learning and self-adaptive functions. They can automatically optimize control parameters based on historical operation data and current pressure change trends, improving the accuracy and response speed of pressure regulation. For example, the system can automatically adjust parameters such as adsorption time and desorption time according to different gas usage conditions to adapt to pressure changes and ensure precise pressure control under various conditions.
Realizing precise adjustment through high-precision valves
Inlet pneumatic regulating valve: An inlet pneumatic regulating valve is installed on the inlet pipeline. These valves have high-precision regulating performance and can precisely control the inlet gas flow according to the signals from the control system. The flow regulation accuracy of these valves can reach ±1%, allowing for precise adjustment of the system pressure by precisely controlling the inlet gas volume. For example, when a slight pressure adjustment is needed, the valve can precisely open or close to a certain angle, increasing or decreasing the inlet gas volume precisely, thereby achieving precise pressure regulation.
Electronic proportional regulating valve: An electronic proportional regulating valve is installed on the outlet pipeline. It can precisely control the output flow of nitrogen gas according to the instructions from the control system. This valve can achieve continuous and precise flow regulation with an accuracy of ±2%. By precisely controlling the output gas volume, it maintains the stability of the system pressure and precise regulation. For example, when the system pressure fluctuates slightly, the electronic proportional regulating valve will respond quickly, adjust the valve opening degree, and precisely change the output flow to maintain the pressure at the set value.
Self-acting pressure regulating valve: Self-acting pressure regulating valves are installed at key parts of the nitrogen generator. They do not require external energy and can automatically adjust the valve opening degree according to the pressure changes in the system. When the pressure exceeds the set value, the valve opens to relieve pressure; when the pressure is lower than the set value, the valve closes or reduces the opening degree to maintain pressure stability. This valve has the characteristics of rapid response and stable regulation, and can be used as an auxiliary means for precise pressure regulation, further improving the accuracy and reliability of pressure control.
Stable gas source for precise regulation
Stable operation of the air compressor: Ensuring the stable operation of the air compressor is the basis for precise pressure regulation of the nitrogen generator. Selecting a stable-performance air compressor with small pressure fluctuation output, such as an advanced variable-frequency speed control air compressor, can automatically adjust the speed according to the actual gas usage of the nitrogen generator, keeping the output pressure stable. The pressure fluctuation range of the air compressor can be controlled within ±0.05 MPa, providing a stable gas source pressure for the nitrogen generator, which is conducive to subsequent precise regulation. Optimization of gas source treatment system: The gas source is subjected to meticulous treatment. Through efficient dryers, filters and other equipment, moisture, oil and impurities in the air are removed to prevent these contaminants from affecting the normal operation of valves and the performance of adsorbents. The dew point of the dried air can reach below -40℃, and the filtration accuracy can reach 0.01μm. This ensures the stable quality of the gas source entering the nitrogen generator, thereby creating favorable conditions for precise pressure regulation. At the same time, regular maintenance and replacement of filter elements, adsorbents and other components in the gas source treatment equipment are carried out to ensure the stable operation and treatment effect of the gas source treatment system.
