Inhibition of diammonium phosphate on the wheat dust explosion

Zhao, Qi; Chen, Xianfeng; Dai, Huaming; Huang, Chuyuan; Liu, Jing; He, Song; Yuan, Bihe; Pan, Yang; Zhu, Huiwei; Liang, Guangqian; Qian, Zhendong

doi:10.1016/j.powtec.2020.04.026

Cited by 62 publications

(9 citation statements)

References 47 publications

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“…Inhibition systems are an effective approach to mitigating accidental dust explosions. − In such systems, the inhibitor is sprayed into a restricted space immediately following the initiation of an explosion to prevent the expansion and propagation of the explosion. Numerous inhibitors have been developed and applied, such as phosphates, alkali metal salts, − and ultrafine water mists, , each of which involves a different inhibiting function. Thus, it is important to investigate the interaction between a specific inhibitor and a combustible dust.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Inhibition of Aluminum Dust Explosion by Sodium Bicarbonate and Its Solid Product Sodium Carbonate

Chen

Xiao

et al. 2021

ACS Omega

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To characterize the inhibiting effects of sodium bicarbonate (NaHCO 3 ) on aluminum dust, the inhibiting capacities of NaHCO 3 and its solid product sodium carbonate (Na 2 CO 3 ) on the explosions of 10 and 20 μm aluminum dusts were studied using a standard 20 L spherical chamber. Explosion parameters were analyzed based on the induction period and explosion stage to evaluate the inhibiting effects. The results show that the induction period of 10 μm aluminum dust explosion is 18.2 ms, which is shorter than that of 20 μm aluminum dust. Two aluminum dust explosions can be completely inhibited during the induction period when inert ratios of NaHCO 3 are 350 and 150%, respectively, but that is not observed after adding the corresponding amount of Na 2 CO 3 . When the inert ratio ranges from 0 to 150%, the physical effect of NaHCO 3 on 10 μm aluminum is poor and the chemical effect is the essential process. But as the inert ratio increased from 200% to 350%, the physical effect of NaHCO 3 is higher than the chemical effect, suggesting that the physical effect is the key factor. With the increase of NaHCO 3 , the physical effect increases gradually. However, the chemical effect changes little. The physical effects of NaHCO 3 including heat absorption and isolation play an essential role in the inhibiting process, which has a significant impact on the pyrolysis process and explosion parameters. The results of the present work provide guidance for the prevention and control of aluminum dust explosions.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Inhibition of Aluminum Dust Explosion by Sodium Bicarbonate and Its Solid Product Sodium Carbonate

Chen

Xiao

et al. 2021

ACS Omega

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“…As shown in Figure 5, the inhibition of sucrose by NaHCO 3 is mainly manifested as a combination of physical and chemical inhibition. According to existing studies [5,10,11,15], the inert powder has roughly the same physical inhibition effect on combustible dust, i.e., the inert powder is mixed and uniformly distributed in the mixed dust system, adhering to the surface of the combustible dust or distributed around it, interfering with the heat conduction and thermal radiation processes between the combustible dusts. When the sucrose is ignited, the combustion starts and the heat is transferred to the surrounding area, and the sucrose molecules form a large number of free radicals and are released into the space..…”

Section: Discussionmentioning

confidence: 99%

“…Jiang et al [13] studied the inhibition effect of NaHCO 3 with different particle sizes on the explosion of aluminum powder and concluded that NaHCO 3 hinders the explosion of aluminum powder by both physical inhibition and chemical inhibition; however, they compared the inhibition of combustion of aluminum powder by NH 4 H 2 PO 4 and NaHCO 3 and pointed out that NH 4 H 2 PO 4 has a better inhibition effect [14]. Zhao et al [15] studied the inhibitory effect of (NH4) 2 HPO 4 on the explosion of wheat dust and found that as the concentration of diammonium hydrogen phosphate increased, the ionic current in the explosion reaction zone of wheat dust first increased and then decreased, which could consequently inhibit the explosion of wheat dust. Xu and Jiang [16] compared the inhibitory effects of NaCl, SiO 2 and SiC on aluminum-methane-air flames, and NaCl had the best inhibitory effect, significantly slowing down the flame propagation.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of Four Inert Powders on the Minimum Ignition Energy of Sucrose Dust

Zhong

Jiang

et al. 2022

Processes

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In order to evaluate the effect of inert powder on the ignition sensitivity of sucrose dust, this study investigated the effects of NaHCO3, NaCl, NH4H2PO4 and Al(OH)3 on the minimum ignition energy (MIE) of sucrose dust. The results showed that all four different inert powders inhibited the MIE of sucrose dust, and all of them showed a trend that the smaller the particle size of the inert powders, the better the inhibition effect. The inhibition effect was ranked as NaHCO3 > NH4H2PO4 > NaCl > Al(OH)3. NaHCO3 and NH4H2PO4 had both physical and chemical inhibition effects, which were better compared to NaCl and Al(OH)3, which had only physical inhibition effects. Analysis of the flame images showed that the inert powder slowed down the combustion of the sucrose dust flame and reduced the flame height. No flame appeared in the region of higher inert powder concentration.

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“…There are many types of explosion suppression, among powder explosion suppression agents have been widely used in the dust suppression due to their wide availability, low price, and easy storage and use. For example, phosphates, 12,13 alkali metal salts, 14,15 rock dust 16 and other substances have certain explosion suppression properties. As a new type of highly efficient intumescent flame retardant, melamine polyphosphate (MPP) can be large-scale produced with the chemical reaction between melamine and polyphosphate, which has been widely used in polyamide, 17,18 polypropylene, 19 poly (methyl methacrylate) 20 and other polymers.…”

Section: Introductionmentioning

confidence: 99%

Investigation on suppression of melamine polyphosphate on acrylonitrile‐butadiene‐styrene dust explosion

Song

Luo

et al. 2021

Process Safety Progress

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There is a possibility of dust explosion during acrylonitrile-butadiene-styrene (ABS) production including cutting, grinding and machining. The suppression effect of melamine polyphosphate (MPP) on the explosion severity and ignition sensitivity of ABS dust, including maximum explosion pressure (P max ), maximum explosion index (K st ), minimum ignition energy (MIE) and minimum ignition temperature (MIT), was systematically investigated. MPP had an inhibitory effect on ABS dust explosion, and the explosion suppression effect was proportional to the mass fraction of MPP. Through the analysis on thermal decomposition behavior, gas-phase products and the explosion residue, the explosion suppression mechanism of MPP on the ABS dust was studied and proposed. According to the thermal analysis and explosion residue analysis results, it could be seen that the addition of MPP improved the thermal stability of the ABS dust and promoted the formation of dense carbon on the surface of ABS particles. Gas-phase products results showed that thermal decomposition of MPP produced NH 3 , CO 2 and H 2 O, which consumed and diluted the oxygen concentration in the explosion zone.

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Inhibition of diammonium phosphate on the wheat dust explosion

Cited by 62 publications

References 47 publications

Investigation on the Inhibition of Aluminum Dust Explosion by Sodium Bicarbonate and Its Solid Product Sodium Carbonate

Investigation on the Inhibition of Aluminum Dust Explosion by Sodium Bicarbonate and Its Solid Product Sodium Carbonate

Inhibition of Four Inert Powders on the Minimum Ignition Energy of Sucrose Dust

Investigation on suppression of melamine polyphosphate on acrylonitrile‐butadiene‐styrene dust explosion

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