In the process of fertilizer production, core processes such as synthesizing ammonia and urea involve a large amount of toxic and harmful gases (such as...)NH₃TheCOTheCO₂TheH₂S）Once the leakage or concentration exceeds the standard, it not only threatens personnel safety, but also leads to chain problems such as catalyst poisoning and equipment corrosion. Infrared gas analyzers, with their high selectivity, stability, and real-time monitoring capabilities, have become a key tool for fertilizer plants to ensure production safety, optimize process control, and achieve environmental compliance.

1、 Process gas monitoring: precise control to improve production efficiency

1. Control of gas purity in synthetic ammonia process

In the production of synthetic ammonia, the raw material gas（H₂TheN₂）It needs to go through processes such as desulfurization, conversion, and compression, and finally generate ammonia under the action of a catalyst. Infrared gas analyzer can monitor the outlet of the converter in real timeCOTheCO₂Concentration, ensure it is below0.5%The process requirements. For example, a certain fertilizer plant installed it after the conversion furnaceNK-500Series analyzer, foundCOWhen the concentration increases abnormally, the system automatically adjusts the water to carbon ratio through linkage（H₂O/C）Extend the service life of the catalyst30%Annual savings on catalyst replacement costs exceed200Ten thousand yuan.

2. In the synthesis of ureaNH₃Leakage warning

Urea production involves a high-pressure ammonium methane condenser. IfNH₃Leakage can cause equipment crystallization and blockage. Infrared analyzer uses non-contact detection technology to accurately measure through steam mistNH₃Concentration. After installing equipment at the outlet of the condenser, a certain factory successfully capturedNH₃Concentration from0.2%Sudden increase1.5%Abnormal, in advance2Closing the valve at an hour avoids a loss of value500An equipment damage accident worth ten thousand yuan.

2、 Construction of Security Protection System: From Passive Response to Active Prevention

1. Three level warning for gas leakage in explosion-proof areas

The explosion-proof areas such as the ammonia tank area and sulfur recovery unit in the fertilizer plant must strictly monitor the concentration of combustible gases. The infrared analyzer adopts an inherently safe design and is compatible with4-20mACurrent output, compatible withDCSSystem linkage achieves three-level warning: whenNH₃Concentration reaches15%LELActivate the sound and light alarm when the lower explosive limit is reached; reach30%LELAutomatically activate the sprinkler system; reach50%LELTriggering an emergency stop. After the application of this system in a certain factory, the response time for gas leakage accidents has increased from15Minutes shortened to30Seconds, personnel exposure risk reduced90%.

2. Safety escort for confined space operations

Portable design of infrared analyzer for repairing confined spaces such as storage tanks and pipelines (e.gNK-500Series handheld models can be quickly detectedO₂TheH₂SConcentration. Its large capacity battery support10Working continuously for hours, coupled with a wireless transmission module, data can be projected in real-time to the monitoring personnel's mobile phones. Maintenance personnel from a certain factory discovered inside a storage tank through equipment inspectionH₂SExcessive concentration (up to)20ppm）Immediately terminate the operation and ventilate, avoiding a poisoning accident.

3、 Environmental compliance and resource recycling

1. Monitoring of exhaust emissions compliance

In the exhaust gas of fertilizer plantsNOₓTheSO₂Emissions must comply withGB 16297-1996Standard. The infrared analyzer can monitor the outlet of the desulfurization tower in real time through multi-component synchronous detection technologySO₂Concentration. After application in a certain factory, it was found that the activity of the desulfurizer decreased, resulting inSO₂Excessive emissions (from)200mg/m³Rise to400mg/m³）After timely replacement of desulfurizer, annual emission reduction can be achievedSO₂reach120Ton, to avoid environmental penalties.

2. CO₂Optimization of recycling process

In urea production,CO₂It is a key raw material. Infrared analyzer can monitor the outlet of pressure swing adsorption deviceCO₂Purity (required)≥98.5%）Automatically adjust the adsorption time when the purity decreases. A certain factory uses this technology toCO₂Increase in recycling rate5%Annual savings in natural gas procurement costs300Ten thousand yuan.

4、 Technological advantages and industry adaptability

The application advantages of infrared gas analyzer in fertilizer plants are significant: firstly, it has strong anti-interference ability, can penetrate interfering substances such as dust and water vapor, and adapt to harsh environments such as granulation towers and compression workshops; Secondly, the maintenance cost is low, and the lifespan of imported infrared sensors is up to5In the year, compared to electrochemical sensors（1Annual decrease80%Replacement cost; Thirdly, the data traceability is reliable and in compliance withHJ 75-2017The Technical Specification for Continuous Monitoring of Flue Gas Emissions from Fixed Pollution Sources provides a legal basis for environmental verification.

From process optimization to safety prevention and control, and then to environmental compliance, infrared gas analyzers have become the core equipment for the digital transformation of fertilizer plants. With the integration of IoT technology, future devices will achieve predictive maintenance and intelligent decision-making, driving the fertilizer industry towards a safer, more efficient, and greener direction.