Dust concentration calculation formula

author: xiechang editor: xiechang source: xiechang time: 2019-04-10 11:53:37
Abstract:
As environmental protection requirements become more stringent, more and more people in each industry will mention a word “emission concentration”. So today we will understand the emission concentration of dust.
 
 
 
 
 
1. The concept of dust emission concentration:
 
     The concentration of pollutants contained in the exhaust gas emitted is in mg/m3.
 
     In other words: how many milligrams of pollutants are emitted by the dust-laden gas after being filtered by the dust collector.
 
2. How to calculate:
 
     In fact, it is easy to understand according to the concept, that is, how many milligrams of dust is in a cubic volume after filtration. So how do we calculate the dust emission concentration?
 
 (1) Know the dust emission rate and air volume.
 
     C (row) = G (row) / Q
 
     C (row): dust emission concentration mg/m3
 
     G (row): dust emission rate mg / h
 
     Q: Air volume m3/h
 
     Let's look at the following example:
 
 
 
 
 
 
 
 (2) Know the dust inlet concentration and filtration efficiency.
 
      After reading the above example, some people already know how to calculate the dust emission concentration, but have you found a problem, this is a dust collector that is already in normal operation, that is, we know the amount of dust G2 collected every hour. Calculated a data, then we do not know this data G2 when designing the dust collector, how to calculate it?
 
       At this time, we will talk about the filtration efficiency of the dust collector (filter cartridge, filter bag, plastic burning plate, glass fiber, water and other filter originals), then we get the dust emission concentration after the efficiency η of the dust collector.
 
      C (row) = C (in) * (1-η)
 
C (row): dust emission concentration mg/m3
 
     C (in): dust inlet concentration mg/m3
 
      η: dust removal efficiency
 
For example: the inlet concentration of the dust of the dust collector is 800mg/m3, and the filtration efficiency of the dust collector is 99%, then the dust emission concentration is 800mg/m3*(1-0.99)=8mg/m3
 
 (3) Know the suction rate of the inlet of the precipitator, the air volume and efficiency of the precipitator.
 
     Because the inlet concentration is sometimes not easy to measure, the average manufacturer will give the amount of dust generated by one day of work as the suction rate of the precipitator.
 
     C (row) = G (in) * (1-η) / Q
 
     C (row): dust emission concentration mg/m3
 
     G (in): dust inlet rate mg / h
 
     Q: Air volume m3/h
 
     η: dust removal efficiency
 
     Let's look at the following example:
 
     For example, the amount of dust generated in production 24 hours a day is 50kg, the design air volume of the dust collector is 10000m3/h, and the filtration efficiency of the dust collector is designed to be 99%. How to calculate the emission concentration?
 
     50kg/24 hours*1000*1000=2083333mg/h
 
     2083333mg/h*(1-0.99)/10000m3/h=2.08mg/m3
 
summary:
 
     After reading the above formula, do you think it is very simple, and you will feel it. In fact, I want to tell you that the above is theoretical calculation (provided that the dust collector has no air leakage, the dust particles are distributed in a single way, and the dust removal efficiency is fixed. In the case of actual production, the types of dust are diverse, the particle size distribution is complex, the concentration of dust is varied, and the filtration efficiency of the dust collector
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