| Three views on the choice of dust collector equipment |
There are three different levels of options for dust collector equipment : The first choice is dust protection, that is, like various diseases, prevention is always more cost-effective than treatment. For example, adding a flow slot when loading and unloading materials and belt transfer can greatly reduce dust, or The amount of smoke and dust generated and treated; When processing loose materials such as steel slag, local sealing is adopted to allow the generated dust and smoke to circulate and consume its kinetic energy, and most of the dust will settle naturally. This type of mechanical dust prevention and dust removal is called unpowered dust removal in foreign countries. In most cases, most of the dust is suitable for unpowered dust removal; at least first, unpowered dust removal pretreatment is required. The second is to use water spray or foam dust removal. On the one hand, direct spray can make the dust particles wet, adhere to each other, condense and grow up, and then it is easy to be separated from the atmosphere. On the other hand, for relatively high temperature smoke, direct spray can be used to achieve evaporative cooling. Flue gas cooling, volume shrinkage, and speed reduction are also conducive to dust removal by the dust collector equipment . In the past, textbooks and design manuals stated that spray dust removal is only suitable for handling dust above 50 μm, and the dust removal efficiency is only 40-70%. Practical experience has proven that, due to the advancement of spray technology, dust can be removed by spray systems with a diameter of more than 10 μm close to 100%, and dust above 1 μm can also remove 90-95%. For example, the use of spray dust removal for tundish turning and steel slag treatment has actually achieved a high dust removal efficiency of 90-95%.
Therefore, from the perspective of reducing emissions, saving energy and reducing costs, we must first consider unpowered precipitator equipment and direct spray dust removal. When we have to, we must consider the third option: ventilation dust removal. 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, we must first consider electric dust removal with low energy consumption, and finally consider a bag dust collector.
According to this thinking, reflecting on the actual selection order of our current dust collector equipment , we can find some problems worth improving: such as converter secondary dust removal, blast furnace iron field dust removal, loading and unloading dust removal and many other similar applications, dust particles 80%, or even 90% % Or more are more than 10 μm, but almost all of our country adopts ventilation dust removal and bag dust collectors, which solves the problem of reducing emissions, but the operating costs are high; the converter LT method removes dust when the dust is not burned. It is also mostly coarse particles, but the inlet concentration of electrostatic precipitator is designed according to 70-100 g / m3, resulting in many electric fields and huge equipment. Of course, the unstable efficiency of some electrostatic precipitators is also a practical problem that must be solved. There is also a lot of dust on the roads in many steel plants. In good conditions, many cleaning personnel clean up the roads, and there is always a lot of dust in the roads that are not cleaned in time. In fact, the idea of dust source management is used to solve where the dust is generated. At the same time, the automatic cleaning of truck tires and chassis can keep the roads in the factory area and even the adjacent social roads clean.
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