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On-line Dilution Monitoring Method of Total Hydrocarbons in Exhaust Gas

A technology for waste gas and waste gas pipelines, which is used in measuring devices, instruments, scientific instruments, etc., can solve the problems of long response time and inability to monitor a large range of monitoring technology, and achieve the effect of short response time

Active Publication Date: 2020-01-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the response time of the existing monitoring technology is too long, and it is impossible to monitor the fluctuation of the concentration of total hydrocarbons in a large range. A new online dilution monitoring method of total hydrocarbons in exhaust gas is provided

Method used

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  • On-line Dilution Monitoring Method of Total Hydrocarbons in Exhaust Gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] An on-line dilution monitoring method for total hydrocarbons in exhaust gas, the gas path connection is as follows figure 1 As shown, the exhaust gas 1 in the pipeline passes through the sampling port, passes through the ball valve, and then is sucked by the large-flow sampling pump 2 along the gas pipeline, and then enters the three-way valve 3. Most of the gas samples are discharged through the flow meter 9 with a controller. Return to the exhaust gas pipeline, and the remaining gas samples pass through the three-way valve 4 and the three-way valve 6 successively, and then are sent to the hydrogen flame ionization detector (FID) for detection. On the valve 4, the other outlet of the three-way valve 6 is connected back to the waste gas pipeline. The gas sampling pipelines mentioned in the figure are all stainless steel pipelines with an inner diameter of 4mm except for the section from the three-way valve 6 to the FID detector, which has an inner diameter of 1mm. The l...

Embodiment 2

[0021] An on-line dilution monitoring method for total hydrocarbons in exhaust gas, the gas path connection is as follows figure 1 As shown, the exhaust gas 1 in the pipeline passes through the sampling port, passes through the ball valve, and then is sucked by the large-flow sampling pump 2 along the gas pipeline, and then enters the three-way valve 3. Most of the gas samples are discharged through the flow meter 9 with a controller. Back to the exhaust gas pipeline, the remaining gas samples pass through the three-way valve 4 and three-way valve 6 successively, and then are sent to the hydrogen flame ionization detector for detection. At the same time, the external compressed air passes through the flow meter 8 as a dilution gas and is connected to the three-way valve 4 , the other outlet of the three-way valve 6 is connected back to the waste gas pipeline. The gas sampling pipelines mentioned in the figure are all stainless steel pipelines with an inner diameter of 4mm exce...

Embodiment 3

[0026] An on-line dilution monitoring method for total hydrocarbons in exhaust gas, the gas path connection is as follows figure 1 As shown, the exhaust gas 1 in the pipeline passes through the sampling port, passes through the ball valve, and then is sucked by the large-flow sampling pump 2 along the gas pipeline, and then enters the three-way valve 3. Most of the gas samples are discharged through the flow meter 9 with a controller. Return to the exhaust gas pipeline, and the remaining gas samples pass through the three-way valve 4 and the three-way valve 6 successively, and then are sent to the hydrogen flame ionization detector (FID) for detection. On the valve 4, the other outlet of the three-way valve 6 is connected back to the waste gas pipeline. The gas sampling pipelines mentioned in the figure are all stainless steel pipelines with an inner diameter of 4mm except for the section from the three-way valve 6 to the FID detector, which has an inner diameter of 1mm. The l...

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Abstract

The invention relates to an online diluting and monitoring method for total hydrocarbon in waste gas and mainly solves the problems that response time is long and monitoring sensitivity and detection upper limit cannot be both taken into consideration when total hydrocarbon concentration fluctuates in a large range in the prior art. According to the online diluting and monitoring method of the total hydrocarbon in the waste gas disclosed by the invention, a mass-flow sampling pump is utilized to obtain higher linear velocity of a sampling pipeline section between a sampling opening and a detector, and a waste gas sample entering the detector is correspondingly diluted according to proportion and change of waste gas concentration measured by the detector. The problems can be better solved according to the technical scheme, and the online diluting and monitoring method can be applied to diluting and monitoring total hydrocarbon in the waste gas in an online mode.

Description

technical field [0001] The invention relates to an online dilution monitoring method for total hydrocarbons in waste gas. Background technique [0002] During the treatment of high hydrocarbon-containing waste gas in petrochemical and other industries, it is necessary to quickly and accurately obtain the total hydrocarbon concentration of the gas to provide data support for subsequent treatment facilities. At present, the common on-line total hydrocarbon concentration monitoring devices or systems in gas are mostly aimed at monitoring the total hydrocarbon concentration in waste gas discharged from the environment or fixed pollution sources. According to Yin Tianya et al. ", 2011, Vol. 40, No. 2: 209-211), so the monitoring range is usually less than 100,000mg / m 3 (calculated as methane, the same below), did not consider the need for large-scale concentration changes, especially to deal with the impact of high-concentration total hydrocarbon concentration gas, because somet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62
CPCG01N27/626
Inventor 魏新明王琼孙晓英邹兵肖安山姜素霞
Owner CHINA PETROLEUM & CHEM CORP
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