Fluorescence sulfur analyzerThe structure consists of a 1100 ℃ combustion furnace, quartz tube, flow control, UV fluorescence detector, microinjector, injection system, and gases used: oxygen and argon. The function of oxygen is to oxidize it into sulfur dioxide, while argon provides protection.

The standard is applicable for determining the total sulfur content in liquid hydrocarbons with a boiling point range of approximately 25-400 ℃ and a viscosity range of approximately 0.2-10m ㎡/s at room temperature. This standard is applicable to naphtha and distillate oils with a boiling point range of 1.0-8000 ㎎/kg. Engine oil and other oils.

The principle of the experiment: Under oxygen rich conditions, sulfur is oxidized to sulfur dioxide (SO2). The gas generated by the combustion of the sample is irradiated with ultraviolet light after removing water. The energy absorbed by the ultraviolet light is converted into excited state sulfur dioxide. When the excited state sulfur dioxide returns to the stable state sulfur dioxide, it emits fluorescence, which is detected by a photomultiplier tube. The sulfur content of the sample is calculated from the obtained signal value.

There are several insights gained during the process of determining sulfur content:

（1） ViewFluorescence sulfur analyzerThe state of

① Check if the remaining amount of gas is sufficient. Some gases contain a lot of moisture, and the gas behind the pipeline has more moisture. The gas should not be less than 2MPa, and the gas pressure should not be too high. If it is too high, it will damage the flowmeter.

② : ViewFluorescence sulfur analyzerIs the quartz tube damaged? Quartz tubes also have their lifespan. The quartz tube we use has a lifespan of 2 years, but we produce a large amount of samples. The white ash on the quartz quartz tube is due to the generated oxides, which can affect the detector's ability to correctly detect the sulfur content in the sample. If there is a large amount of ash, it is recommended to replace it in a timely manner.

③ Check if there is carbon deposition in the quartz tube. Carbon deposition means contamination that makes the test results inaccurate. The carbon deposition is located at the tail of the quartz tube and is black. If it occurs, it should be dealt with in a timely manner. The area with carbon deposition should be calcined at 1000 ℃ for 0.5 hours. If samples are taken every day, the tail of the quartz tube can be calcined for 5 hours after the sample is taken, and the light should be turned off to deal with the carbon deposition or dehydrate it

④ The control of flow rate must be consistent with the flow rate of the curve. If the flow rate is large, the integral value of the standard sample and oil sample will be small. When producing low content such as 1 mg/kg, the integral value will be small and the repeatability will be poor. The control of traffic can be changed

⑤ The speed of the injector can be reduced to allow it to burn fully in the quartz tube, but low content cannot reduce the rate. Otherwise, the integral value will be too small and the repeatability will be too low.

troubleshooting direction

① : ObservationFluorescence sulfur analyzerDoes the signal value fluctuate significantly when not sampling,

② Check if there is carbon deposition at the tail of the quartz tube,

③ The integral value is too small, please change it againFluorescence sulfur analyzerUnder sensitive conditions, redo the curve.