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The first choice is dust prevention, that is, like various diseases, prevention is always more cost-effective than treatment. For example, when loading and unloading materials and belt transfer, a flow cell can greatly reduce dust and smoke generation and treatment; When the bulk material is used, the local airtightness is adopted, so that the generated dust and smoke are circulated and consumed by the kinetic energy, and the dust mostly settles naturally. This kind of mechanical dustproof and dust removal is called unpowered dust removal in foreign countries. Most of the dust in many occasions is suitable for unpowered dust removal; at least the unpowered dust removal pretreatment should be adopted first.
Second, it is to assist in the use of water spray, or foam for dust treatment.
On the one hand, the direct spray can make the dust particles wet, bond with each other, agglomerate and grow up, and then it is easy to separate the atmosphere; on the other hand, for the relatively high temperature flue gas, direct spray can realize evaporative cooling and can be made with a small amount of water. Flue gas cooling, volume shrinkage, and speed reduction are also beneficial for dust removal. Past textbooks and design manuals say that dust removal is only suitable for dusts of more than 50m, and the dust removal efficiency is only 40-70%. The practical experience proves that due to the advancement of the spray technology, the dust of 10m or more can be removed by the spray system, and the dust of 1m or more can also remove 90-95%. For example, the tundish package and the steel slag treatment have achieved a high dust removal efficiency of 90-95% by spray dust removal.
Third, the third choice of the necessary dust removal equipment
Therefore, from the perspective of reducing emissions, saving energy and reducing costs, we must first consider unpowered dust removal and direct spray dust removal. It is only necessary to consider the third option: ventilation dust control. Because as long as you choose ventilation and dust removal, you must have high-energy-consuming fans and dust collectors. It is more difficult to save energy and reduce costs. When using a ventilation and dust removal system, first consider the electric dust removal with low energy consumption, and finally consider the bag filter.
This way of thinking reflect our current dedusting equipment actual selection order, you can find some issues worthy of improvement: for example, secondary converter dust, blast furnace iron out many similar applications field dust, dust and other material handling, dust particles 80%, even 90% All of the above are more than 10?m, but in most of China, the use of ventilation and dust removal, and the use of bag filter, has solved the problem of emission reduction, but the operating costs are very high; the dust is also dusty when the converter LT method is unburned Most of them are coarse particles, but the inlet concentration of electrostatic precipitator is designed according to 70-100 g/billion mils, resulting in a large electric field and huge equipment. Of course, some of the electrostatic precipitators are unstable and are practical problems that must be solved.
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