air compressor

CHRH inverters adjust the motor speed of the compressor and accurately controls the gas filling volume. CHRH inverters have significant advantages in improving energy efficiency, stabilizing gas supply and adapting to changeable working conditions. They are the core energy-saving technology of modern CNG station.

Application of inverters in different CNG station scenarios

   1. Inverter-Driven main station compressor

   · Core role: improve the gas supply efficiency and the total amount of main station

   · Specific advantages: Compared with fixed-frequency products, while the gas supply capacity is increased by 30%, the installed power of the motor can be reduced by 30%, and the energy consumption of the unit gas supply can be reduced by about 8%.

   · Control strategy: "constant speed/constant power" hybrid control is adopted usually. When the pressure of the tank truck is low, it is quickly refired at constant speed; when the pressure is high, it is switched to constant power operation to ensure that the motor is highly efficient and not overloaded.

   2. Inverter-Driven substation compressor

   · Core function: make full use of the gas source of the tank car to improve the gas supply capacity of the low-pressure section. 

   · Specific advantages: The gas supply of the 55kW inverter is comparable to that of the 90kW fixed frequency machine; it can reduce the lower pressure limit of the tank truck from 3MPa to 2MPa, and improve the volume utilization rate of the tank truck by about 5%.

   · System composition: The typical system includes the tank cylinder group, the compressor driven by the variable frequency motor, the gas storage cylinder and the sequence controller, etc. The core is to match the variable intake pressure through inverter speed regulation.

   3. Dual-Purpose compressor

   · Core function: one machine for two purposes, flexible conversion of working mode

   · Specific advantages: One unit can realize the automatic switching of the main station (intake pressure 0.15MPa) and the substation (intake pressure 2-20MPa), which greatly improves the equipment utilization rate and investment efficiency.

What are the main advantages of the application of CHRH inverter:

   · Significant energy saving: this is the most prominent advantage. By adjusting the speed on demand and avoiding empty load or unloading operation, energy costs can usually be reduced by 35%-50%. In the CNG station, the gas supply energy consumption of the Inverter-Driven main station unit can be reduced by about 8%.

   · Stable operation: carry out the precise and stable control of pressure and flow, reduce the pressure fluctuation of the pipe network, and improve the quality of gasification and equipment life.

   · Soft start-up and protection: greatly reduce the start-up current (up to 1.2 times of the rated current), reduce the impact on the power grid, and reduce the start-up wear of mechanical parts.

   · Environmental protection and low noise: The motor drive is cleaner than the gas drive, and the overall noise is lower during inverter running.

When selecting and applying the CHRH inverter, you can refer to the following points:

   1. Clarify the needs and scenarios: First, determine the type of CNG station (main station, substation or regular station) and the fluctuation range of gas volume. For occasions where the demand for gas fluctuates greatly, the advantages of frequency conversion and energy saving are the most obvious.

   2. Analysis of energy-saving benefits: Inverters are long-term investments. Usually, the electricity cost saved in 1-3 years can recover the increased initial investment cost.

   3. Pay attention to the comprehensive control scheme: choose products and suppliers that can provide mature anti-gasping control logic (especially for power grid fluctuation scenarios) and intelligent linkage control (such as multi-machine joint control and remote monitoring).

   4. Pay attention to installation and maintenance: ensure that the power supply line and transformer capacity meet the requirements of the electric drive system, and plan regular professional maintenance.

The application of CHRH inverters on the compressor of the CNG station is a key technology that integrates energy saving and efficiency, smooth operation and intelligent control. For the new construction of stations or the upgrading project of gas drive to electric drive, it is an important choice to improve operational efficiency and competitiveness.