Abstract : This paper compares the traditional and variable frequency drive (VFD) regulation methods for flow rate, pressure, and circulation volume in natural gas purification processes, and analyzes the advantages of VFD regulation in startup and energy saving. Results show that VFD regulation and control offers advantages over traditional forced valve regulation, including better quality, stability, higher precision, significantly reduced motor energy consumption, and lower starting current, thus reducing operating costs and increasing investment. Interference and control issues encountered in practical engineering applications are analyzed, and solutions are proposed . Using VFDs for flow rate, pressure, and circulation volume regulation and control in natural gas purification processes is economically feasible. Keywords : Natural gas purification; VFD; Carrier wave; Harmonic; Filter In natural gas purification processes, fans and solution pumps often operate under variable conditions. To meet the process requirements for flow rate and pressure, forced valve opening is generally used. This not only results in energy loss through throttling but also causes vortex impacts in the pump, generating intense vibration noise, reducing pump lifespan, and causing environmental pollution and energy waste. Currently, a better method is to change the pump speed, thereby adjusting the flow rate under a certain pressure to meet process requirements. With the development of power electronics technology and the continuous improvement of theoretical research and manufacturing processes for power electronic devices, significant advancements have been made in the capacity, voltage withstand capability, characteristics, and types of power electronic devices. Manufacturing quality and product stability have also improved substantially. In the 1990s, power electronic devices further developed towards larger capacity, higher frequency, faster response, and lower losses. As an AC variable frequency speed control device that organically combines modern power electronic devices with microcomputer technology, the development, innovation, and widespread application of this product have brought about a major technological revolution in the field of AC asynchronous motor speed control. After adopting AC variable frequency speed control, the motor starting torque is larger, and the starting current can be reduced to 1-2 times the rated current. This is beneficial for the safe operation of generator sets in small self-provided power stations and reduces the capacity of self-provided generator sets, ensuring the safe and reliable operation of purification plants. 1. Introduction to Natural Gas Purification Processes The main purpose of natural gas purification is to remove moisture and acidic gases such as sulfides from the feed gas. Currently, the most mature process is MDEA (methyl diethanolamine) solution desulfurization. The solution is pumped to the top of the desulfurization absorption tower by an MDEA circulating pump. Under high pressure and ambient temperature, the MDEA solution reacts with acidic gases such as hydrogen sulfide in the feed gas to produce new compounds, thus removing acidic gases from the natural gas and producing qualified natural gas. The MDEA solution that absorbs acidic gases can be decomposed and reduced to MDEA solution and hydrogen sulfide gas upon heating. The MDEA solution can be recycled, and the separated hydrogen sulfide is recovered or vented and incinerated. The desulfurized feed gas enters the dehydration tower from the bottom. The III and G (triethylene glycol) solution is pumped to the top of the tower and comes into full contact with the feed gas from top to bottom. The TEG solution absorbs moisture, which is naturally vaporized upon heating, thus achieving dehydration. The TEG solution can then be recycled. [b][align=center]For details, please click: A Brief Discussion on the Application of Frequency Converters in Natural Gas Purification Projects[/align][/b]