Explosion proof ammonia analysis system is a device used for monitoring and analyzing ammonia in industrial environments, especially in areas with explosion risks, such as fertilizer plants, refrigeration systems, petrochemical production, etc. Due to the toxicity and flammability of ammonia, ammonia analysis systems must comply with strict explosion-proof requirements in these areas to ensure safe operation of equipment in high-risk environments. The following is a benchmark analysis of explosion-proof requirements for the explosion-proof ammonia analysis system.
1. Explosion proof grade standards
The design and manufacture of explosion-proof ammonia gas analysis systems must comply with relevant explosion-proof standards and be classified into reasonable explosion-proof levels based on the environment in which they are located. Common international explosion-proof certification standards include:
(International Electrotechnical Commission Explosion proof Certification): This standard applies to the certification of explosion-proof products worldwide and specifies safety requirements for equipment used in hazardous areas.
European Explosion proof Certification: Mainly applicable to the European market, ATEX standards classify explosion-proof products based on the hazardous environment category and temperature level that the equipment can withstand.
(US Explosion proof Certification): Applicable to the US market, involving the requirements for the use of equipment in different hazardous environments.
China Explosion proof Certification: Explosion proof certification applicable to the Chinese market, classified according to different categories of explosive gases, temperature groups, etc.
Explosion proof level classification:
Gas groups: The common gas groups are IIA (methane gas), IIB (ammonia, ethylene gas, etc.), and IIC (highly explosive gases such as hydrogen and ethylene).
Temperature group: Temperature group indicates the relationship between the highest surface temperature of the equipment and the self ignition point of the surrounding gas. Common temperature groups include T1 (450 ° C), T2 (300 ° C), T3 (200 ° C), T4 (135 ° C), etc.
2. Explosion proof design requirements
The explosion-proof design of the ammonia gas analysis system is a key factor in ensuring the safe operation of equipment in hazardous areas. The following requirements need to be met during design:
Explosion proof design of the casing: The equipment casing must be made of explosion-proof materials (such as aluminum alloy, stainless steel, etc.), and the casing design should have an explosion-proof structure. The strength and sealing of the equipment casing must be sufficient to withstand the potential explosion pressure inside and effectively prevent the spread of flames.
Fire and static electricity prevention: The surface of the equipment needs to have fire and static electricity prevention characteristics to avoid the accumulation of static electricity causing sparks and explosions. All electrical connections and grounding systems should also comply with explosion-proof requirements to prevent spark discharge.
Explosion proof design for internal electrical equipment: All electrical components (such as sensors, control circuits, wiring terminals, etc.) must adopt explosion-proof design to ensure that even if an electrical failure occurs, it will not cause an explosion. It is common practice to use sealed electrical components and explosion-proof cables.
Explosion proof type: Common explosion-proof types include d (explosion proof), e (enhanced type), * * i (intrinsic safety type) * *, etc. The selection should be based on the equipment's usage environment and risk assessment.
3. Safety requirements
Intrinsic safety: The explosion-proof ammonia gas analysis system must have intrinsic safety, especially the ability to quickly respond to abnormal situations such as gas leaks. Even if there is an electrical malfunction, it will not cause a fire or explosion. This type of equipment is usually equipped with redundant circuits and emergency shutdown devices.
Gas leakage protection: The ammonia analysis system should be equipped with a gas leakage alarm device. When the ammonia concentration exceeds the set threshold, it can promptly issue an alarm and automatically activate emergency response mechanisms, such as closing relevant valves, ventilation systems, or starting fire equipment.
Thermal protection design: During equipment operation, heat sources may be generated due to internal circuits, sensor heating, and other reasons. Therefore, thermal protection devices need to be added during design to ensure safe operation of the equipment in high temperature environments. High temperature resistant materials are required to avoid explosions caused by excessively high surface temperatures of the equipment.
4. Explosion proof certification requirements
The equipment needs to pass strict explosion-proof certification to ensure compliance with relevant explosion-proof standards. Explosion proof certification is not only a requirement for the equipment itself, but also includes strict regulations on installation, use, maintenance, and other aspects. For example:
Explosion proof certification mark: The equipment must be affixed with a mark that complies with explosion-proof certification (such as EX mark, UL certification, ATEX certification, etc.).
Installation requirements: The installation location of the equipment must strictly comply with the classification requirements of the explosion-proof zone, and cannot be installed arbitrarily in areas that do not meet explosion-proof conditions.
Maintenance and testing requirements: The explosion-proof ammonia analysis system needs regular maintenance and testing to ensure that the equipment's explosion-proof performance is not affected. Especially regular inspections are required for electrical connections, explosion-proof enclosures, temperature control, etc.
5. Adaptability of operating environment
Explosion proof ammonia gas analysis systems are typically used in harsh industrial environments, so their adaptability to operating environments is highly required
Temperature and humidity requirements: The equipment should be able to operate normally within a certain range of temperature and humidity conditions. Usually, the temperature range is -20 ° C to+50 ° C, and the humidity range is 0% -95% (non condensing).
Dust prevention requirements: The equipment should have a high dust prevention level (usually IP65 or higher) to prevent dust and debris from entering the equipment and affecting performance.
Anti vibration and anti impact design: In industrial sites, equipment may be subjected to vibration and impact, so explosion-proof ammonia gas analysis systems need to be designed with strong anti vibration and anti impact capabilities to ensure stable operation of the equipment in harsh environments.
6. Common technical indicators of explosion-proof ammonia gas analysis system
Detection range: The system should be able to accurately measure ammonia concentration, typically ranging from 0-100ppm, 0-500ppm, etc., depending on the application scenario.
Detection accuracy and response time: A high-precision ammonia analysis system should be able to accurately detect low concentrations of ammonia, with a response time typically required between seconds and minutes to ensure rapid feedback of ammonia changes in the environment.
Gas sampling method: Online sampling is usually used, and air is sent to the analyzer for real-time monitoring through a gas sampling pump.
7. Summary
The explosion-proof requirements of the explosion-proof ammonia analysis system are key to ensuring that the equipment can operate safely and stably in hazardous environments. By strictly following international and regional explosion-proof standards, designing and selecting appropriate explosion-proof levels, temperature groups, and explosion-proof technologies, the risk of explosions can be effectively reduced, ensuring the safety of workers and the environment.