What are the key flammable dusts? How to prevent it from exploding? Please refer to the latest technical documents from the State Administration of Work Safety

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This post was last edited by yinkuilin6868 on 2015-11-18 at 16:23. List of Key Flammable Dusts in the Manufacturing and Trade Industry (2015 Edition) I. Principles for Identification Flammable dusts refer to dusts, fibers, or particles that can burn or smolder in air, and that can form explosive mixtures with air under normal temperature and pressure conditions. The dusts listed in this catalog are limited to those combustible dusts with a relatively high explosion risk, involved in the production and processing by enterprises in industries such as metallurgy, non-ferrous metals, building materials, machinery, light industry, textiles, tobacco, and commerce. This catalog was established based on relevant domestic and international standards, literature, and experimental parameters for certain types of dust, as well as case studies of dust explosion accidents from around the world. The characteristic parameters of flammable dust explosions listed in the catalog are the results of experimental tests conducted on dust samples taken from specific sections or equipment within a particular process. II. Meaning of each column 1. Serial number: It refers to the sequential number of the combustible dusts in this catalog. 2. Product name: refers to the name of the combustible dust. 3. Median particle size: It refers to the particle size at which the cumulative percentage of the particle size distribution of a dust sample reaches 50%, with the unit being μm. 4. Lower explosion limit: It refers to the lowest concentration at which a dust cloud can sustain flame propagation under the action of a given energy ignition source, with the unit being g/m3. 5. Minimum ignition energy: refers to the minimum amount of energy from an ignition source required to cause an explosion in a dust cloud, measured in mJ. 6. Maximum explosion pressure: refers to the highest pressure that can be reached when a dust cloud explodes in a closed container under certain ignition energy conditions; the unit is MPa. 7. Explosion index: It refers to the product of the maximum explosion pressure rise rate of dust and the cube root of the volume of the enclosed container, with the unit of MPa·m/s. 8. Dust cloud ignition temperature: refers to the lowest temperature of a hot surface required to ignite a dust cloud, measured in °C. 9. Ignition temperature of dust layer: refers to the lowest temperature of the hot surface at which a dust layer of a specified thickness catches fire on that hot surface, unit: °C. 10. Explosion hazard level: The level of danger associated with dust explosions, determined by taking into account both the ease with which combustible dusts can be ignited and the severity of the resulting explosions. List of Key Flammable Dusts in the Industrial and Trade Sectors (2015 version) Serial Number Name Median Diameter (μm) Lower Explosive Limit (g/m3) Explosive Hazard Level I. Metal Product Processing 1 Magnesium powder 625 High 2 Aluminum powder 2360 High 3 Aluminum-iron alloy powder 23 High 4 Calcium-aluminum alloy powder 22 High 5 Copper-silicon alloy powder 24–250 High 6 Silicon powder 21–125 High 7 Zinc powder 3–14000 Relatively high 8 Titanium powder Relatively high 9 Magnesium alloy powder 21 Relatively high 10 Silico-iron alloy powder 17 Relatively high II. Processing of Agricultural and By-product Products 11 Corn starch 15–60 High 12 Rice starch 18 High 13 Wheat starch 27 High 14 Fructose powder 15–60 High 15 Pectinase powder 3–460 High 16 Potato starch 3–360 Relatively high 17 Wheat flour 5–660 Relatively high 18 Soybean flour 28 Relatively high 19 Rice flour