With the gradual increase of enterprises in small coal-fired boilers, the boiler flue gas pollution release has polluted the people healthy living environment, medium and small coal-fired boilers throughout the country, according to news reports of domestic air pollution, air pollution seriously exceed the standard, in order to people's physical health should also be efforts to transform the surrounding environment. Then from a large number of small and medium sized coal fired boiler to start with the.
Coal-fired boilers are common, and coal fired boilers are the most important in the power and heating industry. Along with the coal-fired boiler with shortcomings of electrostatic precipitator gradually exposed, after the proof of time, of coal-fired boiler, electrostatic precipitator is not suitable, then it can choose the most suitable for a coal-fired boiler precipitator, and high dust removal efficiency, environmental standards will be non bag dust collector.
The main advantages of the bag dust collector in the dust removal of the medium and small coal-fired boilers are the following several points:
1. Dust removal efficiency
As we all know, bag filter has higher efficiency of dust removal than electrostatic precipitator, especially for heavy metal particles and sub micron dust particles seriously affected by human body. Usually, the dust removal efficiency is more than 99%, and the emission of smoke and dust can be less than 50mg/Nm3, even below 10mg/Nm3, almost zero emission.
2. Change of flue dust concentration in boiler outlet
To the bag filter, the change of the concentration of smoke and dust only causes the change of the load of the filter bag of the bag dust collector, which leads to the change of the frequency of the dust cleaning. The speed of ash accumulation on the smoke concentration high filter bag is fast, the corresponding ash clearing frequency is high, and conversely, the frequency of dust removal is low, but the emission concentration will not change. For electrostatic precipitator, the change of smoke concentration directly affects the power charge of dust, so it also directly affects the efficiency of electrostatic precipitator, which is ultimately reflected in the change of emission concentration. Usually the dust concentration increases the dust removal efficiency, the emission concentration will increase correspondingly; the dust concentration reduces the dust removal efficiency and the emission concentration will decrease accordingly.
3. Change of flue gas temperature
For bag filter, too low flue gas temperature and condensation may cause "paste bag" and shell corrosion. The flue gas temperature is too high, and the allowed temperature of filter material is easy to burn bag to damage the filter bag. But if the change of temperature is within the range of the temperature of the filter material, it will not affect the efficiency of the dust removal. The temperature that causes adverse consequences is under extreme temperature (accident / abnormal state). Therefore, for bag filter, there must be effective protection measures for limiting temperature control.
For electrostatic precipitator, the flue gas temperature is too low, condensation will cause shell corrosion or high voltage creepage, but it is good for the efficiency of dust removal. The increase of flue gas temperature and the increase of dust specific resistance are not conducive to dust removal. Therefore, the flue gas temperature directly affects the efficiency of dust removal, and the effect is more obvious.
4. Change in chemical composition of flue gas (or burning coal)
The bag dust collector: the chemical composition of the flue gas has no effect on the dust removal efficiency of the bag filter. But if the smoke contains elements that have corroded all the filter material, it will directly affect the life of the filter material.
The electrostatic precipitator: the chemical composition of the flue gas directly causes the change of the dust than the resistance, which affects the efficiency of the dust removal and has a great influence. The influence is directly on the content of sulfur oxides in the flue gas. The higher the content of sulfur and oxygen compounds, the lower the dust resistance is, the easier the dust will be captured and the efficiency of dust removal will be high. Conversely, the dust removal efficiency will be low.
5. Energy consumption in the operation of equipment
When the dust removal efficiency of more than 99.5% electric precipitator corona power single dramatically increased the efficiency of electric precipitator in 99.8%, its energy consumption is lower than that of the conventional bag dust collector; dust removal efficiency is more than 99.8%, the energy consumption is higher than that of the conventional bag filter, according to the new environmental protection measure, the dust removal efficiency almost more than 99.8% to meet.
6, steel consumption
The cloth bag duster and dust collector consume less steel.
7. Land area
The bag dust collector has a small area and can be specially designed according to the requirements of the site.
8. Equipment investment
The investment of the electrostatic precipitator is obviously higher than that of the bag filter.
9. Safety
The bag dust removal has no high voltage danger, and the safety of the body is increased.
In summary, the advantages of the bag dust collector in the dust removal of the small and medium coal-fired boilers are more obvious, and the bag dust remover on the boiler is widely used.
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Professional | Bag filter in the small and medium-sized coal-fired boiler dust in the advantages
- 发布日期：2018-01-06 阅读数：
