CO₂ Cylinder Filling Unit
Introduction
The CO₂ gas cylinder filling unit is a specialized system that fills liquid carbon dioxide from liquefaction equipment or storage tanks into standard high-pressure steel cylinders or welded insulated gas cylinders (Duwa tanks) through precise metering and pressure differential filling.
Basic operating principle
Filling is a physical process that utilizes pressure difference and low-temperature liquid characteristics. Its core is to fill the bottle with liquid rather than gas to achieve efficient and high-purity filling.
Gas cylinder preparation and connection
After weight inspection, pressure inspection, vacuuming or replacement, the empty cylinder is connected to the busbar of the filling scale.
01
Low temperature liquid transportation
Liquid CO₂ (about -20 ℃, pressure 1.6-2.1 MPa) from the storage tank is pressurized by a low-temperature liquid pump or directly transported to the filling manifold using the tank's own pressure.
02
Differential pressure filling
Open the filling valve and use the pressure difference between the filling end and the gas cylinder to quickly flow liquid CO₂ into the cylinder. During the process, some liquids undergo flash evaporation (gasification) due to a decrease in pressure, which absorbs heat and keeps the bottle at a low temperature, facilitating continuous liquid filling.
03
Weighing and cutoff
The filling scale monitors the weight in real time. When the preset nominal filling amount is reached (such as 25kg for a 40L steel cylinder), the filling valve is automatically closed to ensure safety and prevent overloading.
04
Sealing and leak detection
After filling, let it stand still. The liquid inside the gas cylinder absorbs heat and vaporizes to reach the equilibrium pressure at room temperature (about 5-7 MPa). Then, perform airtightness testing and install the cylinder valve protective cap.
05
Main advantages and functions
Core function
1. Product terminal distribution: Bulk liquid CO₂ is packaged into standardized and circulating gas cylinders and directly supplied to end users such as catering, welding, laboratories, and small food factories.
2. Safety guarantee: Ensure the safety of each shipped gas cylinder through strict vacuum pumping, weight inspection, and pressure inspection procedures.
3. Flexible supply: Meeting the market demand for small batches, multiple batches, and multiple varieties (industrial/food grade) is an indispensable part of the sales network.s.
Core strengths
1. High filling efficiency and low losses: Liquid filling is used, which is much faster than gaseous filling and reduces losses caused by gas compression heating.
2. Automation and precise measurement: Integrated automatic weighing and measurement system with high accuracy (± 0.1%), eliminating overloading and underloading, and achieving data traceability.
3. Strong safety and reliability: The process includes multiple safety interlocks (automatic cut-off for overweight and overpressure), and the equipment complies with special equipment safety regulations.
Parameter Specifications
|
Filling capacity |
Applicable gas cylinder types |
filling pressure |
measurement accuracy indicators |
Nominal filling capacity |
Key supporting facilities |
|
100-2000 bottles/day |
Seamless steel gas cylinder (40L), welded insulated gas cylinder (175L-495L Duwa tank) |
Inlet liquid source pressure: 1.6-2.5 MPa (G) |
±0.1% F.S. |
5kg, 25kg |
Vacuum pumping capacity: ≤10 Pa, leak detection sensitivity |
(For Reference Only)
Summary
The CO₂ gas cylinder filling unit is a standardized packaging workshop that transforms large-scale industrial products into end products. It achieves the ultimate realization of product value and maximization of market reach through automated and high-precision processes, while ensuring safety and compliance.
For CO₂ producers or large distributors, investing in the construction of their own filling units means controlling the last key link in the value chain, not only directly obtaining profits from the retail end, but also building a stable and flexible sales network, which is an important infrastructure for establishing competitive advantages in regional markets.
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