General principle of selection of filter material for dust collector of waste incineration
Sewage treatment: the process of purifying and purifying the water to meet the water quality of a water body or again. Sewage treatment is widely used in building, agriculture, transportation, energy, petrochemical, environmental protection, urban landscape, medical treatment, catering and other fields, and is also increasingly entering the daily life of ordinary people.
About water pollution issue has always been mentioned, especially the problem of groundwater pollution in Zhejiang, Hangzhou, Wenzhou and other places have farmers or entrepreneurs funded please Environmental Protection Bureau to swim in the river, in order to draw attention to the water pollution degree, although the various environmental protection bureau have chosen silence or rejection, but the public awareness of environmental protection, concern the degree of water pollution reached unprecedented. The surface water pollution is obvious, and the pollution of the groundwater is startling. Of the 1 billion 300 million population of China, 70% of the water is drinking water, and more than 400 of the more than 660 cities are drinking water sources. But it is reported that 90% of the country's urban groundwater has been polluted.
Another set of data shows that groundwater is facing a severe challenge. In 2011, 9 provinces and cities in Beijing and Shanghai evaluated 857 monitoring wells in the area. The water quality was 2% for I and II, while 76.8% for IV and V.
Matters needing attention
1, handling air volume
The handling of air volume refers to the volume of the dedusting equipment that can purify the gas in a unit time. The unit is per hour cubic meter (m3/h) or per hour standard cubic meter (Nm3/h). It is one of the most important factors in the design of bag type dust remover. According to the design or selection of air bag type dust collector, generally cannot make filter in air exceeds the specified operating conditions, otherwise, the bag is easy to plug, shorten the life span of the pressure loss increased substantially, the dust removal efficiency will decrease; but it cannot be selected volume is too large, or to increase investment in equipment and space. The reasonable selection of air volume is often determined by the process and experience.
2. Use temperature
For bag filter, its temperature depends on two factors. The first is the highest temperature of the filter material. The second is that the gas temperature must be above the dew point temperature. Because of the large selection of glass fiber filter materials, the maximum service temperature can reach 280 degrees. For those gases above this temperature, temperature reduction measures must be taken. For the gas below dew point temperature, temperature lifting measures must be taken. There are many PPS filters. The temperature is 170 degrees. For a bag filter, the relationship between the temperature and the efficiency of dust removal is not obvious. This is different from the electrostatic precipitator. For the electrostatic precipitator, the change of temperature will affect the specific resistance of dust and so on.
3. The dust concentration at the entrance
That is, the concentration of inlet dust is determined by the process of dust collection point. When designing or selecting bag filter, it is next to the important factor of air volume. It is represented by g/m3 or g/Nm3.
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