Sample cracking voltage stabilizer

Abstract

The invention discloses a sample cracking voltage stabilizer, comprising a high-temperature cracking furnace and a blind extension-type quartz tube, wherein an argon inlet and an oxygen inlet of the quartz tube are respectively connected with a mass flow meter, a gas buffer device composed of a cylinder, a piston and a stepping motor is arranged at the exit of the quartz tube, the exit of the cylinder is connected with a mass flow meter, a gas pressure detector is arranged in the cylinder, and all the flow meter, the detector and the stepping motor are connected with a control panel of a computer. The sample cracking voltage stabilizer can be applied in relative analytical instruments to detect the content of sulfur and nitrogen, so that the sample reaction is sufficient, air pressure and flow are stable, and therefore, the detection precision is improved, and repeatability deviation is reduced.

Description

technical field [0001] The invention relates to a sample cracking and voltage stabilizing device, which is applied to an analysis instrument for measuring the element content of a sample by using ultraviolet fluorescence method and chemiluminescence method. Background technique [0002] The measurement of sulfur by ultraviolet fluorescence method and the measurement of nitrogen by chemiluminescence method use a high-temperature cracking furnace to heat a quartz tube, and a cracking and combustion reaction occurs. The argon gas blows the pyrolyzed sample from the small cavity into the large cavity of the quartz tube to burn. The sample is oxidized from the liquid state to the gaseous state and burns, and its volume rapidly increases by 2000 times, forming a high pressure in the quartz tube, causing the pressure of the gas circuit system to increase first and then decrease, and quickly push the reaction gas in the quartz tube to the sample gas outlet and enter the detection c...

AI Technical Summary

Problems solved by technology

1. Due to the short time of the high-concentration sample gas in the detection chamber, the reaction time is not sufficient, the emitted photons are relatively small, and the value of the photoelectric signal detected by the photomultiplier tube is relatively small

When the content of sulfur and nitrogen elements is lower than 10mg / L, the test results are not linear, and the repeatability and reproducibility have large deviations

2. The sample gas flows out of the quartz tube in a short time. If the oxygen in the quartz tube is not sufficient, it is easy to cause the sample gas to not fully react in the quartz tube, resulting in carbon deposition, polluting the detection room, and affecting the detection accuracy of the analytical instrument.

3. The original gas path uses a combination of rotameter and needle valve. The gas flow is unstable, the gas pressure in the gas path is unstable, and the gas passing through the detection room is not uniform, resulting in unstable detection background in the detection room and signal The value fluctuates, and the difference caused by the background fluctuation can be ignored when detecting large-content samples. When the content of sulfur and nitrogen elements is lower than 50mg / L, the background fluctuation affects the detection results, and the repeatability deviation is large.

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