Why does Trolley-Type CO₂ Fire Extinguisher leave no residue after use?

Trolley-Type CO₂ Fire Extinguisher is widely used in industrial, commercial and public places due to its efficient and clean fire extinguishing properties. Compared with other types of fire extinguishers, a significant advantage of cart-type CO₂ fire extinguishers is that they do not leave any residue after use. This feature increases firefighting efficiency and also provides additional benefits in terms of cleaning and safety. The following will discuss in depth the reasons why cart-type CO₂ fire extinguishers are residue-free and why they are important.

1. Working principle of cart-type CO₂ fire extinguisher
The working principle of the trolley-type CO₂ fire extinguisher mainly relies on the physical properties of carbon dioxide gas. When the valve of the fire extinguisher is opened, the liquid carbon dioxide stored in the high-pressure cylinder is quickly released, quickly converted into gas, and ejected at a high speed. During this process, carbon dioxide changes from liquid to gaseous state, and is accompanied by heat absorption during injection, causing the surrounding temperature to drop sharply.

2. The reason for no residue
Physical properties of carbon dioxide: Carbon dioxide is a gas that does not react chemically with other components in the air at normal temperatures and pressures. It physically suppresses the flame during fire extinguishing by reducing oxygen concentration and temperature, rather than extinguishing the flame through a chemical reaction. As a result, the injected carbon dioxide is completely dispersed in the air and leaves no residue on the surfaces or equipment being extinguished.
Rapid diffusion of gas: The ejected carbon dioxide gas can quickly diffuse and mix with the surrounding air. Due to its light and gaseous state, carbon dioxide does not accumulate in one location but is rapidly diluted, ensuring that no solid or liquid residue is formed in the extinguished area.
Cleanliness and Safety: Carbon dioxide is a non-flammable gas and does not produce any harmful by-products during fire suppression. This means that after using the trolley-type CO₂ fire extinguisher, users do not need to worry about the residue affecting the environment or causing safety hazards.

3. The importance of no residue
Suitable for sensitive environments: Trolley-mounted CO₂ fire extinguishers are particularly suitable for environments that need to be kept clean, such as electronic equipment, hospitals, laboratories and high-end commercial places. In these places, any residue may cause equipment damage or contamination. Using CO₂ fire extinguishers can ensure a clean environment after extinguishing the fire.
Save cleanup time: After using the CO₂ fire extinguisher, there is no need to clean up and normal operations can be quickly restored. Compared with the residue left by foam or dry powder fire extinguishers, the use of CO₂ fire extinguishers greatly reduces the workload of subsequent treatment.
Environmental protection and safety: The no residue feature makes the trolley-type CO₂ fire extinguisher more advantageous in terms of environmental protection. There is no burden on the environment and potential health risks are reduced.

The trolley-type CO₂ fire extinguisher has demonstrated its unique advantages in fire fighting due to its residue-free characteristics. The physical properties of carbon dioxide and its rapid diffusion after injection ensure the cleanliness of the fire extinguishing process, making it tidy and safe to use in various environments. This type of fire extinguisher is particularly suitable for places that require high cleaning standards, such as electronic equipment and laboratories.