Pulse type ultraluminescence method sulphur ¿Cmeasuring dedicated quartz tube
A fluorescence method, pulsed technology, applied in fluorescence/phosphorescence, test sample preparation, material excitation analysis, etc., can solve the problems of small sample injection volume, short residence time, affecting the accuracy of sulfur measurement, etc.
Active Publication Date: 2008-08-13
朱明俊
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Problems solved by technology
According to the requirements of the industry standard (SH / T0689-2000), there are two types of combustion tubes: direct sampling combustion tube and boat sampling combustion tube. The main structure is that the middle part is the combustion chamber, and there are sampling tubes and The sample outlet tube, and the part where the sample injection tube is inserted into the combustion chamber is a straight-through tube with a constant diameter. This structure has the following disadvantages: the sample injection volume is small, the sample stays in the combustion tube for a short time, and cannot be fully burned. Carbon causes blackening of the combustion tube and related gas paths, affecting the accuracy of sulfur measurement
Therefore, the existing combustion tube cannot meet the needs of the more advanced pulsed ultraviolet fluorescence method for measuring sulfur
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[0008] Referring to the attached picture, the special quartz tube for sulfur measurement by pulsed ultraviolet fluorescence method is carefully fired from high-quality quartz glass. The middle part of the quartz tube is the combustion chamber 4, and the two ends of the combustion chamber are respectively equipped with a sample inlet tube 1 and a sample outlet tube 6, and there are oxygen and carrier gas inlets. The vaporization chamber 2 in the combustion chamber is provided with a buffer tube 5 coaxial with the combustion chamber near the sample outlet tube. The buffer tube is closed at one end facing the sample tube and opened at the other end. In the tube, there are gaps between the inner and outer walls of the buffer tube, the outer wall of the sample tube, and the inner wall of the combustion chamber. The outlet of the vaporization chamber is trumpet-shaped, with a tapered stopper 3 in the middle, forming a tapered annular channel.
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The present invention discloses a quartz tube special for detecting sulfur by impulse type ultraviolet fluorescence method. Sampling tube and sample discharging tube are set respectively on two end of firebox, a diameter accrescent vaporizing cavity is on the end of the sampling tube inserted in the firebox, a buffer tube with one end closed and one end opened is in the firebox, the sample discharging tube extends into the buffer tube and the inside and outside of the buffer tube have clearance, and the exit of said vaporizing cavity is taper ring channel. Because the present invention employs new structure design, it's convenient for sampling in a large, prolonging the circulation time of the sample in the firebox and making the sample burning sufficiently, eliminating remnant carbon and avoiding the quartz tube and correlation gas roads changing black, improving the sulfur detecting efficient. The sulfur detecting lower limit is 10PPb in impulse type ultraviolet method.
Description
technical field [0001] The invention relates to a combustion tube used for measuring sulfur content by an ultraviolet fluorescence method, in particular to a quartz tube specially used for measuring sulfur by a pulsed ultraviolet fluorescence method. Background technique [0002] In the fields of petrochemical production and environmental protection, accurate determination of sulfur content in samples is very important. At present, the ultraviolet fluorescence method is widely used to measure sulfur. During the operation, the sample should be sent into the combustion tube first, and the sulfur will be oxidized into sulfur dioxide in the oxygen-enriched condition. According to the requirements of the industry standard (SH / T0689-2000), there are two types of combustion tubes: direct sampling combustion tube and boat sampling combustion tube. The main structure is that the middle part is the combustion chamber, and there are sampling tubes and The sample outlet tube, and the p...
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IPC IPC(8): G01N21/64G01N1/28
Inventor 朱明俊潘巧英薛元祥陈官容
Owner 朱明俊
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