Gas sensor in the gas leakage accident disposal application

1、For combustible gas monitoring and alarm

At present, the development of gas-sensitive materials makes the gas sensor high sensitivity, stable performance, simple structure, small size, cheap, and improve the selectivity and sensitivity of the sensor.

Existing gas alarms, mostly using tin oxide plus precious metal catalyst gas-sensitive components, but poor selectivity, and due to catalyst poisoning and affect the accuracy of the alarm.

The sensitivity of semiconductor gas-sensitive materials to gas is temperature dependent. At room temperature sensitivity is low, with the rise in temperature, the sensitivity increases, at a certain temperature to reach the peak. Since these gas-sensitive materials in the need for higher temperatures (generally greater than 100 ℃) to achieve the best sensitivity, which not only to consume additional heating power, but also trigger a fire.

The development of gas sensors has solved this problem. For example, iron oxide-based gas-sensitive ceramics made of gas sensors, do not need to add precious metal catalysts can be caused by high sensitivity, good stability, with a certain selectivity of the gas sensor. Reduce the operating temperature of semiconductor gas-sensitive materials, greatly improve their sensitivity at room temperature, so that they can work at room temperature.

Gas sensors are installed in the production, storage, transportation and use of flammable, explosive, toxic and hazardous gases to detect the gas content in time and find out the leakage accidents at an early stage. And link the gas sensor with the protection system, so that the protection system will act before the gas reaches the explosion limit, and the accident loss will be controlled to the minimum.

2、Detecting gas types and characteristics

After the gas leakage accident, the accident disposal will be carried out around sampling and testing, determining the alert area, organizing the evacuation of the people in the dangerous area, rescuing the poisoned people, plugging the leakage, decontaminating and so on. Since toxic gases can enter the human body through the human respiratory system and cause injury, safety protection in the disposal of toxic gas leakage accidents must be completed quickly. This requires the accident disposal personnel in the shortest possible time after arriving at the accident scene to be able to understand the type of gas, toxicity and other characteristics.

Combining gas sensor arrays with computer technology to form an intelligent gas detection system can quickly and accurately identify the type of gas and thus measure the toxicity of the gas.

Due to the high sensitivity of the gas sensors, detection can be carried out when the gas concentration is very low without having to go deeper into the scene of the accident in order to avoid unnecessary injuries due to lack of understanding of the situation. Using computerized processing, the above process can be completed quickly.

In this way, effective protective measures can be taken quickly and accurately, and the correct disposal plan can be implemented to minimize accidental damage. In addition, since the system stores information on the nature of common gases and disposal plans, if the type of gas in a leakage accident is known, the nature of the gas and the disposal plan can be directly queried in this system.

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