Dust explosion in the hottest food industry

2022-08-13
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Dust explosion in food industry

key words: food industry, food safety, dust explosion, minimum ignition energy, 20L spherical explosion test system

dust explosion and fire accidents in food industry often cause huge losses and impacts to society and enterprises, so it is very important for every employee to know where the accident may occur and the severity of the consequences. From the perspective of personal safety and health or good business awareness, every employee of the factory has the responsibility to prevent explosion and fire, so as to prevent the enterprise from losing trust to consumers, or causing market share due to a wide range of factory downtime. 12 Loss of electromechanical drive system

therefore, we must understand the dust explosion and fire in the food industry. We know from the reported data that the occurrence rate of explosion accidents in the food industry is much higher than that in any other industry, and 30% of all explosion accidents are related to food and feed. Of course, we also know that compared with pharmaceutical products and pharmaceutical intermediates, many foods are difficult to ignite in the state of dust clouds. For example, the minimum ignition energy of sugar, milk powder and flour is 30 MJ, 50 MJ and 50 MJ respectively, while the minimum ignition energy of paracetamol in the pharmaceutical industry is less than 10 mJ. But judging from the consequences of the fire, accidents in the food industry are usually more serious. Because the storage capacity of large sugar, grain or starch warehouses can reach 50 or 100 tons or even more, such storage capacity is common in the food manufacturing industry, but rare in the pharmaceutical industry. When the drug dust containing many complex organic macromolecules explodes, the pressure is high, so it is suggested that the ball screw with servo system can fully meet the user's requirements, and the lifting rate may be very large. Manufacturing and processing equipment is prone to accidents if appropriate explosion-proof measures are not taken

explosion is not the only aspect concerned in safety production, although its direct impact may be the largest. Fires caused by the decomposition and ignition of powder are also surprisingly common, especially those caused by the intentional heating or crushing of products during the drying process. Many common foods are prone to spontaneous combustion due to self heating. For example, many milk powders will undergo autothermal reaction when the temperature exceeds 100 ℃ (often based on their fat content). Some essence have poor thermal stability, and sometimes the tea containing these essence will spontaneously catch fire

how should we prevent dust explosion and fire accidents in the production workshop? This requires reference to the assessment of professional risk assessors, relevant standards and production guidelines, as well as the data on ignition, explosion and thermal stability of powder, which can be obtained in the laboratory test at the tip of the iceberg. The test data can be used as an important basis to judge whether the following reactions or accidents occur: 1) whether there is a fire hazard, 2) whether spontaneous combustion may occur, and 3) whether the relevant dust will constitute an explosion. After risk assessment, corresponding fire and explosion prevention measures should be taken to effectively control those ignition sources that are usually not easy to be noticed, such as static electricity, friction and impact sparks, surface temperature of machine shell, electric sparks and fires caused by illegal entry into the production workshop (it must be noted that dust explosions caused by welding and cutting operations or smoking are common)

generally, when combustible dust clouds may exist, corresponding protective measures and preventive measures must be taken. Explosion pressure relief port is the most commonly taken protective measure in the food industry. Its design is based on the 20 liter spherical explosion test system (20lsa) to test the maximum explosion index KST value of dust clouds. With the improvement of safety awareness, protective measures often used in the chemical industry are gradually applied to food factories. These measures include dust explosion suppression, explosive pressure vessels and the use of inert gases

finally, any preventive and protective measures (hardware or software) determined after professional risk assessment should be effectively implemented, installed and maintained. We often find potential safety hazards in damaged grounding wires, secondary welded explosion-proof doors and unmaintained fire extinguishing devices. (end)

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