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Briefly describe the functional characteristics of each component of the high-precision sulfur analyzer
Date: 2025-11-24Read: 0
High precision sulfur analyzer is a key equipment for determining the total sulfur content of samples in coal quality analysis, petroleum product testing, and environmental monitoring. It is widely used in the fields of power, metallurgy, chemical engineering, and quality inspection. It is based on the principle of high-temperature combustion Coulomb titration or infrared absorption, and achieves precise quantification of sulfur signals from sample decomposition through multi module collaboration. Understanding the functional characteristics of each component of a high-precision sulfur analyzer is the foundation for correct operation, maintenance, and fault diagnosis.
1、 High temperature combustion furnace
The core of a high-precision sulfur analyzer is a tubular high-temperature furnace, usually heated with silicon carbide rods or resistance wires, with a temperature control range of 1150-1350 ℃. In this high-temperature oxygen rich environment, organic sulfur and inorganic sulfur (such as pyrite sulfur) in the sample are oxidized to produce sulfur dioxide (SO2). Fill the furnace with quartz wool or catalyst (such as tungsten trioxide) to ensure sufficient combustion and rapid reaction, and avoid sulfide residue causing low results.
2、 Gas purification and transportation system
After removing moisture and carbon dioxide through a drying tube (filled with color changing silicone gel and sodium lime), air or oxygen is passed into the combustion zone at a constant flow rate. This system ensures the cleanliness of the carrier gas and prevents impurities from interfering with subsequent testing; A flow meter or mass flow controller (MFC) accurately adjusts the gas flow rate (usually 1000 mL/min) to ensure stable delivery of SO2 to the detection unit.
3、 Detection unit
According to different principles, it can be divided into two categories:
Coulombic titration cell: SO2 enters the titration cell containing potassium iodide potassium bromide electrolyte, reacts to generate sulfuric acid, and the instrument supplements iodine/bromide ions through electrolysis. The sulfur content is calculated based on the consumed electricity (Faraday's law), with high sensitivity and good linearity;
Infrared detection cell: SO2 has strong absorption of specific wavelength infrared light, and the concentration can be inverted by measuring the attenuation of light intensity. It has a fast response, does not require reagents, and is suitable for continuous analysis.
Both have automatic baseline correction and anti-interference algorithms to improve stability.
4、 Automatic sample delivery and control system
The automatic sampling device driven by a stepper motor can achieve continuous sampling at multiple workstations (usually 20-48), reducing manual errors. The embedded control system integrates temperature PID regulation, gas flow monitoring, data acquisition and communication modules, supports touch screen operation, USB export and LIMS networking, and meets the intelligent needs of modern laboratories.
5、 Exhaust gas treatment unit
The acidic gases generated by combustion are neutralized in alkaline absorption bottles (such as NaOH solution) and then emptied to prevent equipment corrosion and environmental pollution, in compliance with environmental regulations.
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