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Sample gas processing detection system and method for on-line analysis meter

A detection system and analysis instrument technology, applied in sampling devices, preparation of test samples, etc., can solve the problem of large measurement error of oxygen analyzer, and achieve the effect of high cleanliness, accuracy and stable operation.

Active Publication Date: 2012-06-13
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a sample gas processing and detection system and method for an online analysis instrument, which is used to solve the problem that the sample gas processing is not clean and the measurement error of the oxygen analyzer is too large

Method used

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  • Sample gas processing detection system and method for on-line analysis meter
  • Sample gas processing detection system and method for on-line analysis meter
  • Sample gas processing detection system and method for on-line analysis meter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Regularly use standard gas to calibrate the zero point and span of the oxygen analyzer. The specific experimental data are shown in Table 1.

[0065] Table 1 The results of zero point and span calibration of the instrument after system improvement using standard gas

[0066]

[0067] The instrument is calibrated at zero point and span every other week. Four groups of experiments have been accumulated to show that the data analyzed by the instrument has high accuracy and meets the performance index of zero point drift and span drift less than 0.05% / week, and there is no need to adjust zero point and span. From the analysis of the principle of the instrument, the dust attached to the measuring medium attached to the sensor is one of the main reasons for the drift of the zero point and range of the meter. technical indicators.

Embodiment 2

[0074] In order to verify the application effect of the oxygen analyzer in the actual analysis of the sample gas of the pulverized coal system after the system transformation, the sample gas was analyzed on-line by instrument and manually every other week for a period of time. The specific data are shown in Table 3.

[0075] Table 3 Comparison data of manual analysis and instrument analysis of sample gas after system improvement

[0076]

[0077]

[0078] It can be seen from Table 2 that the numerical consistency between the actual on-line analysis of the instrument and the manual analysis is relatively good (the manual analysis data retains 3 significant figures, and the actual measurement analysis of the instrument retains 2 significant figures), indicating that the analysis results of the instrument after the system improvement meet the error Less than 0.5 is required.

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Abstract

The invention relates to a sample gas processing detection system and a sample gas processing detection method for a on-line analysis meter. The detection system comprises a sampling valve, a water seal washing tank, a cooler, an oxygen analyser and a Venturi tube which are sequentially connected. The method comprises the following steps of: (1) feeding sample gas to the water seal washing tank to wash; (2) conveying the washed sample gas to a cooler and sending out the chilled and dehydrated sample gas from the upper part of the cooler; and (3) feeding the dehydrated sample gas into the oxygen analyser, discharging the sample gas through the Venturi tube after analysing the oxygen content. The water seal washing tank is adopted to remove dust and the cooler is adopted to dehydrate, so that pulverized coal and moisture in the sample gas are effectively removed, the measurement accuracy of the oxygen analyser is ensured and the guarantee is provided for normal production.

Description

technical field [0001] The invention relates to a sample gas processing and detection system and method for an online analysis instrument. Background technique [0002] In the direct coal liquefaction process, the raw coal must be pulverized into coal powder that meets certain particle size requirements before it can be used as a raw material. However, if the oxygen content in the pulverized coal system is too high, the pulverized coal will be in danger of spontaneous combustion. In order to avoid the danger, it is necessary to monitor the oxygen content in the pulverized coal system online. Once the oxygen content exceeds the standard, immediately add an appropriate amount of nitrogen to the pulverized coal system. Therefore, it is very important to accurately detect the oxygen content in the pulverized coal system. [0003] The detection method of the oxygen content in the pulverized coal system is to extract the sample gas from the pulverized coal system, and send it to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/34G01N1/24
Inventor 王希军赵宏世王志强孙祝
Owner CHNA ENERGY INVESTMENT CORP LTD
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