It is also necessary to save energy and reduce costs for environmental protection and emission reduction
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100μm, inhalable dust PM10 ~ 10μm, fine dust PM 2.5 ~ 2.5μm three categories. In general, the finer the dust particles, the more serious the damage, the greater the concentration of dust, such as long-term work in the fine dust environment, do not take appropriate protective measures, it is easy to suffer from lung disease.
In recent years, as China's energy conservation and emission reduction policies and enforcement have increased, some progress has been made in reducing emissions, especially industrial dust removal. However, there is also a problem that arises because of the reduction of emissions, but there is no energy saving, and the increase in costs increases the burden on some companies. In some places and enterprises, environmental protection has become synonymous with investment and fines. Many newspapers and magazines mentioned the importance of energy-saving and emission-reduction, and usually emphasized the introduction of the amount. In fact, it is necessary to increase the efficiency of investment, environmental protection and emission reduction must also be energy-saving to reduce costs, such energy-saving emission reduction investment can be long-term effective, the effectiveness should be more concerned than the number of inputs. Paying attention to the correct selection of dust removal equipment will help reduce emissions while also saving energy and reducing costs.
According to foreign experience, there are three different levels of dust removal equipment choices: the first choice is dust, that is, like all kinds of diseases, prevention is always more cost-effective than treatment, such as loading and unloading, belt transfer when adding a flow channel, you can greatly reduce Dust, or soot generation and processing volume; in the processing of discrete materials such as steel slag, the use of partial airtight, so that the generated dust, dust and dust in the circulation of its kinetic energy, the dust will most of the natural settlement. This kind of mechanical dust-removing and dust-removing is called unpowered dust-removing in foreign countries. In most cases, most of the dust is suitable for non-powered dust-removal;
Followed by the use of spray mist, or foam dust. On the one hand, the direct spray can make the dust particles wet, adhere to each other, agglomerate and grow, and then it is easy to separate in the atmosphere. On the other hand, for the flue gas with higher temperature, the direct spray to achieve evaporative cooling can be made with a small amount of water. Flue gas cooling, volume shrinkage, and speed reduction also contribute to dust removal. Past textbooks and design manuals say that spray dust removal is only suitable for handling dust of 50 μm or more, and the dust removal efficiency is only 40-70%. Practical experience has proven that due to the advancement of spray technology, dusts of more than 10 μm can be removed by nearly 100% through the spray system, and dusts of 1 μm or more can also be removed by 90-95%. For example, tundish turning and steel slag treatment using spray dust removal actually achieve a high dust removal efficiency of 90-95%.
Therefore, from the perspective of emission reduction, energy saving and cost reduction, we must first consider non-powered dust removal and direct spray dust removal. We must consider the third option when it is a last resort: ventilation and dust removal. As long as the choice of ventilation and dust removal, it must have high-energy fans and dust collectors, energy-saving to reduce costs is more difficult. When using the ventilation and dust removal system, we must first consider the low energy consumption of electric dust, and finally consider the bag filter. In this way of thinking, we can reflect on the actual selection sequence of our current dust removal equipment, and we can find some problems worthy of improvement: such as secondary dust removal in converters, dust removal in blast furnaces, loading and unloading of loading and unloading materials, and similar applications. Dust particles are 80% or even 90%. The above are more than 10μm, but almost all of our country adopts ventilation and dust removal, and a bag filter is used to solve the emission reduction problem, but the operating costs are very high; the dust is also the majority when the converter LT method is used to remove dust. It is coarse particles, but the inlet concentration of the electrostatic precipitator is designed in the range of 70-100 g/m3, resulting in a large electric field and large equipment. Of course, some unstable electrostatic precipitators are also a practical problem that must be solved.
There are also dusts in the roads of many steel mills. The good conditions are cleaned by many cleaning personnel. There is always a lot of dust that is not cleaned in time in the plant area. In fact, with the idea of ​​dust source management, where can the dust be solved, and at the same time, automatic cleaning of truck tires and chassis can be used to keep the roads of the plant area and even the adjacent social roads clean. This is where the gap between some localities and enterprises in China and foreign advanced countries is greatest.