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High pressure explosion limit measuring device and molar fraction gas distribution method based on the device

A technology of explosion limit and measuring device, which is applied in the direction of material explosion and can solve problems such as deviation

Active Publication Date: 2019-08-02
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

When using the gas distribution method of this volume ratio, if the flammable gas or liquid vapor is close to the ideal gas, the gas distribution has a certain accuracy; however, if the flammable gas or liquid vapor is far from the ideal gas, The volume ratio obtained by using this gas distribution method has a large deviation from the actual volume ratio of the flammable substance under its temperature and pressure conditions

Method used

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  • High pressure explosion limit measuring device and molar fraction gas distribution method based on the device
  • High pressure explosion limit measuring device and molar fraction gas distribution method based on the device
  • High pressure explosion limit measuring device and molar fraction gas distribution method based on the device

Examples

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Embodiment 1

[0265] Using the device under the test condition of 0° C. and under different initial pressure conditions, a mixture with a mole fraction of isobutane of 8.5% (about the upper limit concentration of isobutane explosion) was prepared. image 3 It is the comparison of the mole fraction of isobutane obtained according to the mole fraction gas distribution method of the present invention and the volume fraction of isobutane obtained according to the ideal gas partial pressure law, and the ratio of mole fraction and volume fraction is respectively provided in the figure Absolute deviation and relative deviation, from image 3 It can be seen that when the initial pressure is small, the mole fraction of isobutane actually prepared is very close to the volume fraction, but as the initial pressure increases, the deviation of the isobutane mole fraction and volume fraction actually prepared When the initial pressure is 2000kPa, the relative deviation between the two exceeds 2.5%. At thi...

Embodiment 2

[0267] Using this device under the test conditions of 50°C and different initial pressure conditions, the mixture of 4% flammable liquid n-heptane + 6% flammable gas methane was prepared. When experimenting with gas distribution, inject n-heptane first with a syringe, and then inject methane through the combustible gas storage tank. Figure 4 For the comparison of the mole fraction of n-heptane obtained according to the mole fraction gas distribution method of the present invention and the volume fraction of n-heptane obtained according to the ideal gas partial pressure law, Figure 5 For the comparison of the mole fraction of methane obtained according to the mole fraction gas distribution method of the present invention and the volume fraction of methane obtained according to the law of ideal gas partial pressure, the absolute deviation and relative deviation of mole fraction and volume fraction are respectively provided in the figure. It can be seen from the figure that whe...

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Abstract

The invention discloses a high pressure explosion limit measuring device and a molar fraction gas distribution method based on the device. The device comprises an explosion container, a compressed airstorage tank, and one or more combustible gas distribution assemblies, wherein the explosion container and the compressed air storage tank are connected via a compressed air inlet, the respective combustible gas distribution assemblies are connected to the explosion container, and the explosion container and the compressed air storage tank are both provided with temperature measuring components,temperature control components and pressure sensors. The high pressure explosion limit measuring device and the molar fraction gas distribution method based on the device provided by the invention canaccurately obtain the accurate mole fraction of combustibles in the mixture with air, and solve the problem that the explosion limit experimental research cannot be accurately quantitatively characterized since the beginning. For flammable gas, the molar fraction of the mixture can also be accurately determined by establishing its precise dedicated equation of state, especially the Helmholtz equation of state.

Description

technical field [0001] The present invention relates to the measurement of safety indicators of flammable gas and liquid vapor, in particular to a high-pressure explosion limit measuring device for flammable gas and flammable gas-liquid mixture and a mole fraction gas distribution method based on the device, which can be used for flammable gas Research work on the safety of inert gases and liquids. Background technique [0002] The explosion limit is one of the most important indicators to characterize the flammability of gases and liquid vapors, indicating the concentration range in which they can burn in air. Different flammable substances have different explosion limit data, and under different initial temperature and pressure conditions, the explosion limit of flammable substances is not the same. As the data of the important properties and safety analysis of flammable substances, the explosion limit has important application value in the fields of actual energy, chemic...

Claims

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Application Information

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IPC IPC(8): G01N25/54
CPCG01N25/54
Inventor 张可符文孟现阳毕胜山吴江涛
Owner XI AN JIAOTONG UNIV
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