1. Introduction

As the core equipment in the chemical industry, the precise detection of oxygen content inside the reactor is a key link to ensure safe production and improve process efficiency. Especially in high-risk reactions such as oxidation and hydrogenation, abnormal oxygen concentration may cause explosions, fires, or a decrease in product quality. The environment in the reaction vessel is relatively complex, often accompanied by strong acids, strong bases, corrosiveness, and a large amount of water vapor. This plan combines industry standards, technical means, and pre-processing corresponding to working conditions to propose a full process solution from detection equipment selection, deployment strategy to data management, aiming to reduce safety risks and optimize process control.

2、 Detection target and standard basis

1. Core testing indicators

• Oxygen concentration rangeAccording to the process requirements, it is usually necessary to control within5%-10%(Volume ratio), some working conditions may require0.1%-25%.

• response timeKey control points require≤5Second, ensure real-time performance.

• Accuracy and stability: Error≤±2%FSLong term drift≤±3%FS/6h.

2. standard basis

• Domestic standards：GB/T 12955-2008The "Combustible Gas Detection Alarm" stipulates that the range of the oxygen detector should cover the process limit value150%.

• International Standard：IEC 60079-29-2Explosion proof equipment is required to passExCertification, applicable to high-risk chemical environments.

3、 Selection of Testing Equipment and Technology

Online monitoring system

• Device Selection: RecommendedNGPGgas detectorNGP5-O2Oxygen online analyzer, capable of synchronously measuring oxygen concentration and supporting4-20mA/RS485Signal output.

• Technical Features：

• Adopting industrial electrochemical sensorsHigh sensitivity（0.1%VOL）Fast response time（T90≤30S）But regular calibration is required.

• adoptNGPGCustomized pre-processing system:Can filter strong acids, strong alkalis, corrosive substances, and large amounts of water vapor.

4、 Deployment strategy for detection points

1. critical area

• Top of reaction vesselMonitor the overall oxygen concentration inside the kettle to prevent explosions.

• Near the mixing shaftIdentify local oxygen enrichment caused by uneven mixing.

• Inlet and outletMonitor oxygen fluctuations during the feeding process to prevent overpressure.

2. Deployment principles

• Redundant designKey areas are monitored using dual devices to ensure data reliability.

• Spatial dimension coverageEstablish a three-dimensional concentration field model with a dual probe configuration.

5、 Data processing and warning mechanism

1. data management

• real-time transmissionUpload data to the monitoring platform through IoT technology, supporting WeChat and SMS push of alarm information.

• Historical data analysisIntegrate historical data, predict trends in oxygen concentration, and optimize process parameters.

2. early warning mechanism

• graded warningSet according to the concentration threshold“High concentration”“Low concentration”“safety”Level 3 warning.

• emergency responseWhen the concentration exceeds the standard, an alarm will be automatically triggered, and the power system and nitrogen charging system will be urgently cut off.

6、 Case analysis

1. Online detection system for oxygen content gas in a chemical enterprise

summary

This plan integrates an online monitoring system, portable detection equipment, and data analysis platform to achieve full process and precise detection of oxygen content in chemical industry reaction vessels. Combining domestic and international standards and industry practices, the solution has high reliability, high safety, and scalability, which can provide strong guarantees for the safety production of chemical enterprises. In the future, with the continuous advancement of technology, detection methods will further develop towards intelligence and online direction, promoting the continuous improvement of safety level in the chemical industry.