Measuring device for high-pressure explosion limit of flammable liquid and gas distribution method for mole fraction

A technology of explosion limit and measuring device, which is applied in the fields of material explosiveness, computer-aided design, design optimization/simulation, etc., and can solve the problem that the volume ratio cannot represent the actual ratio of flammable liquids, etc.

Active Publication Date: 2020-03-17
XI AN JIAOTONG UNIV
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Problems solved by technology

When using the gas distribution method of this volume ratio, if the flammable liquid vapor is close to the ideal gas, the gas distribution has a certain accuracy; however, if the flammable liquid vapor is far from the ideal gas, use this gas distribution method The volume ratio obtained by this method cannot be used to accurately characterize the actual proportion of flammable liquids

Method used

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  • Measuring device for high-pressure explosion limit of flammable liquid and gas distribution method for mole fraction
  • Measuring device for high-pressure explosion limit of flammable liquid and gas distribution method for mole fraction
  • Measuring device for high-pressure explosion limit of flammable liquid and gas distribution method for mole fraction

Examples

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Embodiment 1

[0106] Use this device to prepare mixtures of n-pentane and air with different mole fractions under the test conditions of 30°C and 800KPa. image 3 Be the comparison of the mole fraction of n-pentane obtained according to the mole fraction gas distribution method of the present invention and the volume fraction of n-pentane obtained according to the ideal gas state equation, image 3 The absolute deviation and relative deviation of the mole fraction and the volume fraction are respectively given in the figure. It can be seen from the figure that when the mixed gas with a small mole fraction of n-pentane is prepared, the actually prepared mole fraction and volume fraction are very close. However, with the increase of the n-pentane mole fraction, the deviation between the mole fraction and the volume fraction is constantly increasing. When the n-pentane mole fraction reaches 20%, the relative deviation between the two has exceeded 20%, and it cannot be used at this time. Volume...

Embodiment 2

[0108] Using the device under the test conditions of 50° C. and under different initial pressure conditions, a mixture with an ethanol mole fraction of 18.5% (about the concentration of ethanol explosion upper limit) was prepared. Figure 4 It is the comparison of the mole fraction of ethanol obtained according to the mole fraction gas distribution method of the present invention and the volume fraction of ethanol obtained according to the ideal gas state equation, Figure 4 The absolute deviation and relative deviation of the mole fraction and the volume fraction are respectively given in the figure. It can be seen from the figure that when the initial pressure is small, the mole fraction and the volume fraction of ethanol actually prepared are very close. However, as the initial pressure increases As the pressure increases, the deviation between the molar fraction and volume fraction of ethanol obtained in actual preparation continues to increase. When the initial pressure is...

Embodiment 3

[0110] Using this device under the test condition of 100kPa, under different initial temperature conditions, the mixture with the toluene mole fraction of 7.0% (about toluene explosion limit concentration) was prepared. Figure 5 It is the comparison of the mole fraction of toluene obtained according to the mole fraction gas distribution method of the present invention and the volume fraction of toluene obtained according to the ideal gas state equation, and the absolute deviation and relative deviation of the mole fraction and volume fraction are respectively provided in the figure ,from Figure 5 It can be seen from the figure that when the initial temperature is high, the actual prepared toluene mole fraction and volume fraction are very close, but as the initial temperature decreases, the deviation between the actually prepared toluene mole fraction and the volume fraction increases continuously , when the initial temperature is 0°C, the relative deviation between the two ...

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Abstract

A high-pressure explosion limit measuring device for flammable liquids and a mole fraction gas distribution method, including an explosion vessel and a compressed air storage tank; components and a pressure sensor; an end cover is arranged on the top of the explosion vessel, an ignition part and a liquid sampling port are arranged on the end cover, and a liquid sampling device is arranged at the liquid sampling port. The invention adds a high-pressure sealing plug on the outside of the liquid inlet gasket and the sampling plug, so that the injection sampling method can be successfully applied to the explosion limit test device of the pressure measurement method, so that the flammable liquid vapor under the high pressure initial condition The injection volume can be precisely controlled, so that the precise test of the explosion limit can be realized. The device of the invention has a simple structure and is easy to implement.

Description

technical field [0001] The invention relates to the measurement of the safety index of flammable liquids, in particular to a high-pressure explosion limit measuring device of flammable liquids and a mole fraction gas distribution method, which can be used for safety research of flammable 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, chemical industry, chemistry, fire protection, and pharmaceuticals. [0003] The methods for measuring the exp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/54G06F30/20
CPCG01N25/54G06F30/20
Inventor 张可符文胡晓振毕胜山吴江涛
Owner XI AN JIAOTONG UNIV
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