Gas chromatography fault detection method based on mixed gas dew point calculation
A mixed gas and gas chromatography technology, applied in the field of polyolefins, can solve the problems of insufficient carrier gas purity, reduced reliability, inaccurate chromatographic analysis results, etc. The effect of low hardware cost
Active Publication Date: 2019-07-26
ZHEJIANG BONYEAR TECH
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Problems solved by technology
[0005] In actual application, insufficient carrier gas purity, unstable voltage, incomplete vaporization, impurities in gas samples, aging equipment, negligence in daily maintenance, etc. will cause inaccurate chromatographic analysis results and lower reliability
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Embodiment
[0087] Gas Chromatography State Detection of Vapor-Liquid Balance Tank of Polypropylene Plant
[0088] In a polypropylene production unit, R1_H2 / C3 is the hydrogen / propylene concentration ratio in the reactor, and this variable has a good correlation with the product quality index—the melt index R1_MFR. exist figure 2 Among them, after R1_H2 / C3 changes, the melt index R1_MFR changes accordingly, indicating that the chromatographic analysis results are accurate. At this time, the temperature deviation dT is very small and has been around 0 (not exceeding the threshold), and this method has always determined that the chromatographic state is normal.
[0089] exist image 3 Among them, the chromatographic analysis results fluctuated, but the product quality R1_MFR did not change, which indicated that the chromatographic analysis results were inaccurate. At this time, the temperature deviation dT starts to move away from 0 (exceeding the threshold), and this method determines ...
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The invention discloses an online gas chromatography state detection method based on mixed gas dew point calculation, which comprises the following steps: Step 1), calculating the obtained dew point Tdew of the mixed gas by using the concentrations (Y1, Y2,..., Yi) of all components analyzed by gas chromatography and the pressure P of a gas-liquid balance tank; Step 2), comparing the calculated dew point temperature with the actually measured temperature T of the gas-liquid balance tank, and calculating a deviation value TDelta of the temperature T; and Step 3), judging the chromatographic state according to the threshold epsilon, if the deviation TDelta is smaller than the threshold epsilon, judging the chromatographic state to be normal, otherwise, judging the chromatographic state to beabnormal. The online gas chromatography state detection method based on mixed gas dew point calculation realizes the online detection of the gas chromatography fault by the equipment such as a gas-liquid balance tank and the like which are common in polyolefin devices and by adopting a method of comparing the dew point calculated according to the chromatographic signal with the temperature / pressure signal actually measured by the gas-liquid balance tank.
Description
technical field [0001] The invention relates to the field of polyolefin, in particular to a method for judging the reliability of online gas chromatography by calculating the dew point of mixed gas in the polyolefin production process. Background technique [0002] The production process of polyolefin includes gas phase method and liquid phase method. For the gas phase process, the gas phase composition in the reactor is the key to the stable production of the device and the core to ensure the quality of the product. Therefore, most factories install online gas chromatography analyzers to detect the gas phase composition in the reactor in real time. [0003] However, a large amount of fine powder will be produced during the polyolefin production process, and the fine powder is easily entrained into the sampling system of the online gas chromatography, causing partial or complete blockage of the sampling system, and correspondingly, the analysis value of the gas chromatograp...
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IPC IPC(8): G01N30/86
CPCG01N30/8665
Inventor 柳慧中欧丹林
Owner ZHEJIANG BONYEAR TECH