Universal sample introduction apparatus and universal sample introduction method for gaseous hydrocarbons and liquefied petroleum gas

A technology of liquefied petroleum gas and sampling device, which is applied in the direction of analysis materials and instruments, can solve the problems of poor repeatability of liquefied petroleum gas data results, incomplete gasification of liquefied petroleum gas, inaccurate quantification, etc. Quantification and quantification, overcoming the inaccuracy of liquid quantification, and ensuring the effect of consistency

Active Publication Date: 2018-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most refineries have a strong reaction to the composition of liquefied petroleum gas and the measurement results of sulfur content of liquefied petroleum gas, and the repeatability of the test is very poor. An order of magnitude, analysts have no confidence in their own data, repeatability and reproducibility data are too poor
After a large number of investigations and data verification, the main reason for the poor precision of the determination of LPG composition, sulfur content and water content is the problem of the sampling system: incomplete gasification of LPG, inaccurate quantification, condensation after gasification, gasification Sampling problems such as process pipeline adsorption are the main reason for the poor repeatability of LPG data results
According to literature reports, the sulfur content will be attenuated by 20% within 2 hours and nearly 50% in 4 hours, so it is difficult to guarantee the authenticity and validity of the data by directly using the gas valve to inject gas.
When injecting and quantifying the liquid valve, it is necessary to ensure that there are no air bubbles in the part of the quantitative loop of the injected liquid. The observation tube is designed in the standard to avoid the influence of air bubbles on the quantification, but the actual operation is difficult to do. The air bubbles are difficult to drain, so the injection data has poor repeatability and it is difficult to quantify accurately
[0007] Aiming at various problems in the determination of sulfur content and composition of liquefied petroleum gas in the market, the present invention combines the advantages of liquid sampling and gas quantification to provide a sampling device and method capable of fully gasifying liquefied petroleum gas and accurately quantifying it. It can realize stable sampling of liquefied petroleum gas and gas samples, and solve the important problem of poor repeatability and reproducibility in the determination of liquefied petroleum gas and gaseous hydrocarbon sulfur content and composition in the petrochemical industry

Method used

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  • Universal sample introduction apparatus and universal sample introduction method for gaseous hydrocarbons and liquefied petroleum gas
  • Universal sample introduction apparatus and universal sample introduction method for gaseous hydrocarbons and liquefied petroleum gas
  • Universal sample introduction apparatus and universal sample introduction method for gaseous hydrocarbons and liquefied petroleum gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] according to figure 1 The device measures the sulfur content of the liquefied petroleum gas sample, and the inlet 11 of the analyzer is connected to a sulfur content analyzer. Turn on the power of the instrument, check the connection of the pipeline, set the temperature of the gasification chamber 3 to 100°C, the temperature setting value can be adjusted according to the sample type, set the temperature of the quantitative loop 6 to 80°C, and set the temperature of the standard sample according to the Condition setting. After the temperature reaches the set value, the system is purged and the sampling loop 6 is filled. The volume of the quantitative loop is 3mL. Adjust the back pressure valve to stabilize the pipeline pressure at 3 kg. When the pressure is stable, switch the six-way valve and introduce the sample in the quantitative loop into the analyzer for analysis. The sulfur content read by the analyzer is 45.7 mg / m 3 , the repeated test result was 46.3mg / m 3 , ...

Embodiment 2

[0051] The test process is the same as in Example 1, except that the sample is not replaced, but the temperature of the vaporization chamber is set to 120°C. The two test results determined were 46.1mg / m 3 and 46.3mg / m 3 , which proves that the sample has been completely vaporized at 100°C, so the repeatability is good.

Embodiment 3

[0053] according to image 3 The device measures the sulfur content of the liquefied petroleum gas sample, and the inlet 11 of the analyzer is connected to a sulfur content detector. Turn on the power of the instrument, check the connection of the pipeline, set the temperature of the vaporization chamber 3 to 100°C, and set the temperature of the quantitative loop 6 to 60°C. After the temperature reaches the set value, the system is purged and the quantitative loop 6 sample filling process is carried out. The sample to be measured is a liquefied petroleum gas sample produced by a certain factory. The liquid sampling method is used. The volume of the quantitative loop after gasification is 3mL. Adjust the back pressure valve to stabilize the pipeline pressure at 3 kg. When the pressure is stable, switch the six-way valve to introduce the sample in the quantitative loop into the analyzer for analysis. The two test results determined were 126.1mg / m 3 and 125.3mg / m 3 , the test...

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Abstract

The invention provides a universal sample introduction apparatus and universal sample introduction method for gaseous hydrocarbons and liquefied petroleum gas. The universal sample introduction apparatus for gaseous hydrocarbons and liquefied petroleum gas comprises a sample introduction port (1), a sample flow control valve (2), a sample vaporizing chamber (3), a gas pressure reducing valve (4),a channel switching part (5), a gas quantification ring (6), a carrier gas inlet (7), a carrier gas flowmeter (8), an exhaust outlet (9), a counterbalance valve (10), an analyzer inlet (11) and a heating control module (12). The apparatus and method of the invention can realize accurate quantification of a sample; the counterbalance valve additionally arranged at the tail end of the quantificationring can guarantee stability and accuracy of pressure in the quantification ring, and sample sizes are maintained consistent every time through temperature control of the quantification ring, heat preservation of pipelines and passivation; and the apparatus can realize accurate quantification of the sample by increasing system pressure, so samples hard to detect or trace samples can be determined.

Description

technical field [0001] The invention relates to a sampling device for gaseous or liquid hydrocarbon samples, in particular to a sampling device for gaseous hydrocarbons and liquefied petroleum gas. Background technique [0002] With the development of petrochemical industry, liquefied petroleum gas has been paid more and more attention as a basic chemical raw material and new fuel. LPG refers to petroleum gas liquefied under high pressure or low temperature, referred to as "liquefied petroleum gas" or "liquefied gas". Its composition is propane, n-butane, isobutane and a small amount of ethane, organic compounds larger than carbon 5, unsaturated hydrocarbons, etc. LPG has the characteristics of flammability, explosiveness, gasification, thermal expansion, and corrosion. LPG is generally obtained from petroleum gas in oil and gas fields, refineries or ethylene plants. Compared with other fuels, LPG has the advantages of less pollution, high calorific value, easy transporta...

Claims

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Application Information

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IPC IPC(8): G01N35/10
CPCG01N35/10
Inventor 赵丽萍吴明清陶志平李涛常春艳赵杰潘光成
Owner CHINA PETROLEUM & CHEM CORP
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