In the national comprehensive emission standard for air pollutants, there are detailed provisions on dust emission concentration and emission rate. This paper mainly describes the selection of water film dust removal and desulfurizer, hoping to help the industry friends.
In order to implement the national environmental protection law and air pollution prevention and control law, to prevent air pollution, the state formulated the boiler emission standards for air pollutants.The standard according to the use fixed number of year is divided into two periods, Ⅰ time built on December 31, 2000 for use in a boiler;Ⅱ time is on January 1, 2001 was built using the boiler.The emission standard of air pollutants in industrial kilns (gb9078-1996).
According to foreign experience, there are three different levels of dust removal equipment selection: the first choice is dust prevention, that is, like all kinds of diseases, prevention is always more cost-effective than treatment, such as loading and unloading, belt transport when adding a groove, can greatly reduce dust, or dust generation and treatment capacity;In the treatment of steel slag and other loose materials, the use of local sealing, so that the dust generated, smoke and dust in the cycle of consumption of its kinetic energy, most of the dust naturally settled down.This kind of machinery dust control, dust removal in foreign countries is called no power dust removal, in large number of occasions most dust is suitable for the use of no power dust removal;At least use a non - powered dust removal pretreatment.
The second is the auxiliary use of spray fog, or foam dust.On the one hand, direct spray can make dust particles wet, stick to each other, agglomerate, grow and then easily separate from the atmosphere.On the other hand, for flue gas with high temperature, a small amount of water can be used to cool the flue gas by direct spray to achieve evaporative cooling. Volume contraction and speed reduction are also conducive to dust removal.In the past, textbooks and design manuals have said that spray dust removal is only suitable for handling 50?For dust above m, the dust removal efficiency is only 40-70%.Practical experience has shown that due to the progress of spray technology, 10?The dust above m is close to 100%.Dust above m can also be removed by 90-95%.For example, the tunement turning and steel slag treatment with spray dust removal have achieved a high dust removal efficiency of 90-95%.
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