Topic
Flash powder
About: Flash powder is a research topic. Over the lifetime, 26 publications have been published within this topic receiving 155 citations.
Papers
TL;DR: In this article, the minimum ignition energy (MIE) of dust clouds is required to assess the electrostatic ignition risk, and the experimental results show that the MIE for flash powders are in the range from 89.2 to 19.8 mJ for micron-and nano-sized particles.
Abstract: The minimum ignition energy (MIE) of dust clouds is required to assess the electrostatic ignition risk. Recently, the growing number of accidents shows that fire and explosions occurring in fireworks industry are due to electrostatic discharge (ESD). The objective of the this paper is to discuss the various practical concerns during the handling of flash powders of various compositions containing potassium nitrate, sulfur, and aluminum in fireworks. These powders form dust clouds and cause fires and explosions because the MIEs of these dust clouds are very low. This study is carried out with powders of various sizes ranging from micron and nanometer. The measurements are done by using a 1.2-L Hartmann apparatus. The experimental results show that the MIEs for flash powders are in the range from 89.2 to 19.8 mJ for micron- and nano-sized particles. The experimental results are given for various changes, such as: electrode gap, electrode material, and dust concentration, dust composition, etc. If the nano flash powder is mixed with micron powders, the MIE is greatly reduced, and it becomes extremely combustible. Therefore, it is imperative for fireworks manufacturers, or anyone handling these dusts, to take precautionary measures to prevent fires and explosions involving ESDs. © 2011 American Institute of Chemical Engineers Process Saf Prog, 2012
36 citations
TL;DR: In this article, the pros and cons of using nano powders in the manufacture of fireworks have been analyzed, collecting data from various research works and presenting the same as a review article.
30 citations
TL;DR: From the results it follows that in the pressure range studied, the level of confinement seems to have a minor effect on the features of the generated residue particles, and it is impossible to draw definitive conclusions.
27 citations
TL;DR: In this paper, the composition of flash powder has been modified by blending with boron powder, in order to minimize workplace accidents and the explosive nature of fireworks, while reducing the amount of aluminium in the flash powder.
25 citations
TL;DR: In this paper, the authors focused on the synthesis of nano and micro flash powders with different trials of composition and found that the nano flash powder shows low ignition temperature compared to micron and also has high mechanical sensitivity.
Abstract: The flash powder composition is used in the fireworks industry to manufacture the firecrackers which consist of potassium nitrate, aluminium and sulphur in 75 μm range. This study focuses on the synthesis of nano and micro flash powders with different trials of composition. The particle sizes of the nanochemicals are 142.8, 93.10 and 91.28 nm for KNO3, Al and S, respectively. The nano flash powder is mixed with micron flash powder in different ratios to manufacture the crackers and thus the noise level for the crackers are found. Thermal analysis was conducted in differential thermal and thermo gravimetric analyser. Also, impact sensitivity and friction sensitivity of the nano flash powder are analysed. The nano flash powder shows low ignition temperature compared to micron and also has high mechanical sensitivity. Fire crackers which contains one gram of 100 % nano flash powder emits the threshold noise level of 125 dB(AI) in spite of 4 g of 10 % nano flash powder for the same composition.
22 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2022 | 1 |
| 2021 | 5 |
| 2020 | 2 |
| 2019 | 1 |
| 2017 | 1 |
| 2014 | 2 |