How is the working pressure of the pressure swing adsorption(PSA) 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 system regulation
Pressure sensor precise monitoring: High-precision pressure sensors are installed at key parts of the nitrogen generator, such as the air inlet, adsorption tower, and air outlet. These sensors can accurately detect pressure changes in real time, with an accuracy typically reaching ±0.01MPa or even higher. The sensors convert pressure signals into electrical signals and transmit them to the control system.
PID control algorithm: The control system employs a proportional-integral-differential (PID) control algorithm. It automatically calculates and outputs control signals based on the deviation between the actual pressure value from the pressure sensor and the set pressure value, precisely regulating 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 air intake valve or decrease the opening degree of the air 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 ±0.05MPa or less.
Intelligent control system: Some advanced nitrogen generators are equipped with intelligent control systems, featuring 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 instance, 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.
High-precision valves for precise regulation
Inlet pneumatic regulating valve: An inlet pneumatic regulating valve is installed on the air intake pipe. These valves have high-precision regulating performance and can precisely control the air intake flow according to the signals from the control system. The flow regulation accuracy can reach ±1%, allowing for precise regulation of the system pressure by precisely controlling the air intake volume. For example, when a slight adjustment of pressure is needed, the valve can precisely open or close to a certain angle, increasing or decreasing the air intake volume precisely, thereby achieving precise pressure regulation.
Electronic proportional regulating valve: An electronic proportional regulating valve is installed on the outlet pipe. 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 flow, 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, adjusting the valve opening degree to precisely change the output flow, ensuring the pressure remains stable at the set value.
Self-acting pressure regulating valve: Self-acting pressure regulating valves are installed at key parts of the nitrogen generator. They can automatically adjust the valve opening degree based on the pressure changes in the system without external energy. When the pressure exceeds the set value, the valve opens to relieve pressure; when the pressure is below the set value, the valve closes or reduces the opening degree to maintain pressure stability. This valve has a fast response and stable regulation characteristic, serving as an auxiliary means for precise pressure regulation, further improving the accuracy and reliability of pressure control.
Stable air source for precise regulation
Stable operation of the air compressor: Ensuring the stable operation of the air compressor is the foundation for precise pressure regulation of the nitrogen generator. Selecting a stable-performance and output pressure fluctuation-low air compressor, such as one with advanced variable frequency speed regulation technology, 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 ±0.05MPa, providing a stable air source pressure for the nitrogen generator, facilitating subsequent precise regulation.
Optimization of the air source treatment system: Fine treatment of the air source is carried out through efficient dryers, filters, and other equipment to remove moisture, oil, and impurities from the air, preventing these contaminants from affecting the normal operation of the valves and the performance of the adsorbent. 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 air source entering the nitrogen generator, thereby creating favorable conditions for the precise regulation of pressure. At the same time, regular maintenance and replacement of filter elements, adsorbents and other components in the air source treatment equipment are carried out to ensure the stable operation and treatment effect of the air source treatment system.
