Application of composite dust removal technology for sintering machine tail battery

1 Introduction

The 1#105m2 sintering machine of Laiwu Branch of Shandong Steel Co., Ltd. was put into production in June 1993, and it is equipped with a 76m2 single-chamber three-field electrostatic precipitator. The original design smoke emission standard is 150mg/m3, and the flue gas treatment capacity is 218880～359000 m3/ h. In recent years, the national environmental protection requirements have become more and more strict, and the sintering dust collector equipment has deteriorated, resulting in serious discharge exceeding the standard and cannot meet the national dust emission standards. Electrostatic precipitators and bag filters are the main forces in current industrial flue gas purification equipment and play a leading role in dust control. Under the requirements of the new steel industry pollutant discharge standards, due to the limited ability of the electrostatic precipitator to handle fine dust, the bag filter has high running resistance and high energy consumption, and can not meet the dust removal requirements. In the process of reforming the electrostatic precipitator, the electric bag composite dust collector is first used at the tail of the sintering machine, and 70% of dust particles of 10 μm or more in the flue gas are removed by the electric dust removal unit to reduce the dust concentration of the flue gas and control Within 10g/m3, the remaining dust is captured by the bag type dust removal unit, and the total discharge concentration is controlled to be less than 20 mg/m3. After being put into production, the emission concentration is 15.6mg/m3, which is in line with the particulate matter emission concentration limit and the total amount control index requirement in the Shandong Province steel industry pollutant discharge standard DB37/990-2013.

2 Working principle and performance characteristics of electric bag composite dust collector

In the electric bag composite dust remover, the electric dust removal unit acts as a pre-dust remover to collect large particles of dust in the dusty flue gas, effectively eliminating the abrasion of the large particle dust in the flue gas and the damage of the high temperature particles to the bag, and reducing the damage. Filter bag load. At the same time, the dust passing through the electrostatic precipitator unit is charged, and the dust of the same polarity repels each other, so that the dust particles deposited on the surface of the filter bag are arranged in an orderly manner, and the formed dust layer has the advantages of good gas permeability, high porosity and good peelability. [1]. The better the gas permeability of the dust layer, the lower the pressure drop, the longer the cleaning cycle of the bag dust removal, the lower the required cleaning pressure, so that the number and extent of the expansion and contraction of the filter bag are correspondingly reduced, and the filter bag is ensured. Long-term use is not damaged, and bag dust removal has high dust removal efficiency for fine dust.

1) Eliminating the wear of large particles on the filter bag, reducing the load on the bag type dust removal unit, and having high collection efficiency for fine dust.

2) Due to the pre-charge effect, the dust with the opposite charge adsorbs to each other, causing electrocoagulation, so that the fine particle dust is coagulated and becomes larger particle dust for the purpose of trapping, and the same polarity dust repels each other, so that the dust deposited on the filter surface The particles are arranged in order, the dust layer has good gas permeability and low resistance.

3) The electric bag composite dust collector has good adaptability to dust specific resistance, stable efficiency and strong adaptability.

3 Technical transformation plan and operation

The dust collector is a large modification, and it is limited by the site and investment. It is impossible to increase the dust collection efficiency by expanding the effective dust collection area of ​​the electrostatic precipitator, increasing the number of electric fields, and extending the length of the electric field. The electric bag composite dust removal technology can realize maximum reuse and reduce the investment cost; on the other hand, the pre-dusting action of the electric dust removal unit can reduce the requirement for the filter material of the subsequent bag filter, and the price is relatively low. The domestic filter material can achieve higher dust removal efficiency, and the complete transformation into a bag filter will inevitably increase investment and later operation and maintenance costs.

The original 76m2 electrostatic precipitator body and the ash conveying system are completely removed, and the original foundation part is used after being reinforced and strengthened, and extended along the north side. After the new electric bag filter is added, the system resistance is increased, and the fan system needs to be replaced as a whole, and the original foundation is also used. According to the characteristics of the moisture content of the tail gas of the sintering machine, the low temperature of the acid dew point, the wide particle size distribution, the large pile ratio and the strong grinding property, and the temperature ≤150 °C, the high-strength polyester needle felt filter material is selected. Automatic welding wire frame together with carbon, zinc-plated to prevent corrosion. The electric dust removal unit uses a flexing arm vibrating dust removing device to clean the pole plate, and the bag type dust removing unit has a pneumatic disc type air venting valve at the top of the clean air chamber of each unit, and uses the pulse blowing method to perform offline cleaning.

After the electric bag composite dust collector was put into operation, by comparing the ash content of the 1#, 2#, 3#, 4# ash bins and the particle size of the dust ash, it was found that the ash bin of the 1# ash bin, ie the electrostatic precipitator, was placed. It accounts for 70% of the total ash and has a large particle size. During the operation of the electric bag dust collector, the bag dust removal unit collects about 70% of the dust due to the pre-dusting action of the front electric precipitator unit, and the dust particles deposited on the surface of the filter bag are arranged in order due to the charging. The powder layer has good gas permeability, high porosity and good peelability, and the blowing frequency of the bag dust removing unit is greatly reduced, which effectively extends the service life of the bag.

4 Conclusion

The electric bag composite dust collector combines the two most efficient dust removal devices at present, and removes the coarse particles in the flue gas by the first electric field. The subsequent bag unit can use a lower injection pressure and a longer cleaning cycle, which is effective. Extend the life of the filter bag. The utility model can not only exert the characteristics of high efficiency of collecting dust particles by the electrostatic precipitator, but also reduce the dust load of the bag filter unit and the performance requirement of the filter material. The operation and maintenance cost of the equipment is reduced, and the stability and reliability of the equipment operation are improved. At the same time, due to the dust reduction of the dust entering the bag, a higher filtering wind speed and a smaller bag filtering area can be selected, occupying a small area and saving investment. [2], it can not only achieve dust collection effect, but also reduce equipment investment costs. After calculation, the annual economic benefit is about 1.94 million yuan.

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