Views: 0 Author: Site Editor Publish Time: 2025-12-16 Origin: Site
What is a CNG Daughter Station?
Simply put, a CNG Daughter Station is an independent, compact Compressed Natural Gas (CNG) refueling unit. It does not connect directly to long-distance main gas pipelines. Instead, functioning like a flexible “energy outpost,” it receives high-pressure natural gas delivered by CNG transport trailers from a central Mother Station and provides refueling services for local CNG vehicles or industrial equipment.
Compared to traditional fixed stations, modern CNG Daughter Stations, exemplified by those from Jiangsu Huayan, adopt an integrated containerized and skid-mounted design. This means the core systems of the entire refueling station—including unloading, compression, storage, control, and dispensing equipment—are all integrated within one or more standard container-style skids. This design brings revolutionary advantages: high mobility, rapid deployment, and no need for large-scale civil works. Whether for an urban bus depot, a mining fleet base, or a temporary fuel supply point in an emerging overseas market, it can be installed and operational in a short time, significantly lowering the initial investment threshold and site restrictions.
How Does a CNG Daughter Station Work?
Its working principle is efficient and intelligent, with the core objective of safely and steadily transferring gas from the transport trailer to the user's vehicle cylinders. According to Huayan's product description, the workflow is an automated priority/sequencing control process:
Unloading & Primary Dispensing: Upon arrival, the CNG transport trailer connects to the station's unloader. The high-pressure natural gas (typically at 3-20MPa) from the trailer's cylinders first flows through a low-pressure pipeline to the dispenser for direct vehicle refueling.
Priority Supply from Storage: When the pressure in the trailer cylinders falls below the required dispensing pressure, the system automatically switches. The station's built-in medium-pressure storage vessel bank takes over, supplying gas to the dispenser via a medium-pressure pipeline.
High-Pressure Reserve & Automatic Replenishment: If the pressure in the medium-pressure bank also becomes insufficient, the system engages the even higher-pressure high-pressure storage vessel bank. When the pressure in the high-pressure bank drops below a preset value (e.g., 20MPa, adjustable), the station's compressor automatically starts to draw gas directly from the transport trailer to refill the high-pressure bank, creating a continuous refueling cycle.
The entire process is automatically controlled by a PLC (Programmable Logic Controller) and touch screen, making operation simple and intuitive, ensuring an optimal balance between refueling efficiency and system safety. Some models come standard with a generating set, providing self-sufficient power for reliable operation even in areas with weak grid infrastructure.
What is the Investment for Building a CNG Daughter Station?
This is a key concern for investors. An accurate answer is: The construction cost of a CNG Daughter Station is not a fixed figure; it primarily depends on three core variables—storage capacity, equipment configuration, and the specific site location. This is precisely where the value of a customized solution lies.
Huayan's product range clearly demonstrates this flexibility. Their standard modules offer dispensing capacities ranging from 500 Nm³/h to 3000 Nm³/h, and can be customized to integrate different specifications for storage banks, compressors (including energy-efficient models like hydraulic drives), and the number of dispensers. This means you can select a compact 1000 Nm³/h station for a logistics park with dozens of vehicles, or customize a fully integrated station up to 3000 Nm³/h for a large public transport hub or industrial user.
Therefore, the total cost is a function of these factors. The advantage of working with a “one-stop service” provider like Jiangsu Huayan is their ability to conduct precise engineering design and equipment customization based on your specific business scale, daily refueling demand, site conditions, and budget. This tailored model ensures your investment directly corresponds to actual operational needs, avoiding both over-investment and under-capacity, thereby achieving an optimal return on investment.
By opting for a modular, containerized CNG Daughter Station, enterprises are not just acquiring a fuel point; they are investing in strategic infrastructure that enables rapid response to market needs, reduced operational costs, and the fulfillment of environmental responsibilities. It makes access to clean energy simpler and more efficient than ever before.
