High Speed Measurement of the Lower Flammable Limits in a Rapidly Changing Vapour Stream

Pilkington, G.; Paik, Seung Hyun

doi:10.1205/psep.04216

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(2 citation statements)

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“…In the ultra-high temperature environment, where the heat storage oxidation process is carried out, the lower limit of gas explosion decreases significantly because as the temperature rises, the mine gas molecules become more active. 3 Therefore, it is necessary to study the lower explosion limit of a low-concentration gas at ultra-high temperatures. This study can provide a corresponding theoretical reference for the utilization of thermal storage oxidation and other aspects and improve the efficiency of gas utilization on the premise of ensuring safety.…”

Section: Introductionmentioning

confidence: 99%

“…In the standard state, methane gas has an explosion limit range of 5–16%. In the ultra-high temperature environment, where the heat storage oxidation process is carried out, the lower limit of gas explosion decreases significantly because as the temperature rises, the mine gas molecules become more active . Therefore, it is necessary to study the lower explosion limit of a low-concentration gas at ultra-high temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Change Law of Lower Limit of Gas Explosion at Ultra-High Temperatures

Chen

2021

ACS Omega

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During coal seam mining, a large amount of low-concentration mine gas will be produced, and it is the main utilization way to pass it into a thermal storage oxidation device to obtain heat energy. The thermal storage oxidation process is carried out in an ultra-high temperature environment. The excessive gas concentration not only reduces the production efficiency but also presents an explosion hazard. To solve the abovementioned problems, the lower explosion limit of a low-concentration gas at ultra-high temperatures (900–1200 °C) was studied through a self-developed high-temperature explosion experimental device. Fluent software was used to simulate the reaction of a low-concentration gas in a high-temperature environment, and the experimental results were verified according to the maximum explosion pressure. Through analysis and discussion, the following are found: (1) the relationship between the instantaneous explosion pressure of the low-concentration gas and the gas concentration as well as the relationship between the maximum explosion pressure near the lower explosion limit and the gas concentration are in accordance with the Boltzmann function. (2) When the temperature rises from 900 to 1200 °C, the lower limit of gas explosion obtained from experiments is reduced from 2.33 to 1.36%. (3) The lower limit of gas explosion decreases with increasing temperature at ultra-high temperatures and the downward trend slows down, this is similar to the change rule of the lower limit of gas explosion at temperatures below 200 °C. These findings have certain practical significance for improving the utilization efficiency of the low-concentration gas in heat storage oxidation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%