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1、 Risk analysis of dust explosion

Dust explosion refers to a chemical reaction in which combustible dust mixes with air in a confined space to form a dust cloud. Under the action of an ignition source, the resulting dust air mixture rapidly burns and causes a sudden increase in temperature and pressure.

The consequences of dust explosion are serious, and the three values of Pmax, (dP/dt) max, and Kst represent the severity of dust explosion.

Testing equipment: 1m ³ tank and 20L ball

2、 Classification criteria for severity of dust explosions

The classification of the consequences of dust explosions should comprehensively consider the number of workers working in hazardous areas and the degree of impact of the explosion on surrounding buildings. Based on the principle of classifying production safety accidents, the severity of explosion consequences should be ranked from high to low as particularly severe（5) The five levels of major (4), major (3), general (2), and minor (1) are classified according to the following criteria:

1. Especially significant (5): Accidents that exist in the workplace and are likely to cause more than 30 deaths, or more than 100 serious injuries, or direct economic losses of more than 100 million yuan;

2. Major (4): Accidents that exist in the workplace and are likely to cause 10 to 30 deaths, 50 to 100 serious injuries, or direct economic losses of 50 to 100 million yuan;

3. Major (3): Accidents that exist in the workplace and are prone to causing 3 to 10 deaths, or 10 to 50 serious injuries, or direct economic losses of 10 to 50 million yuan;

4. General (2): Accidents that exist in the workplace and are prone to causing less than 3 deaths, or less than 10 serious injuries, or direct economic losses of less than 10 million yuan;

5. Mild (1): The workplace does not exist or is not likely to cause no deaths or serious injuries.

3、 Types of dust explosion protection

The use of explosion protection products can greatly reduce the severity of dust explosion consequences. There are three main designs for explosion protection: explosion venting, explosion resistance, and explosion suppression

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