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What are the unique techniques for the difficulty of ultra-low emission of iron and steel in the sintering process? How to choose the change of on-line monitoring system
- Categories:News
- Author:Xi'an Juneng
- Origin:Xi'an Juneng
- Time of issue:2019-06-26 10:28
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(Summary description)钢铁超低排放，氮氧化物、烧结烟气超低排放具有重要意义
What are the unique techniques for the difficulty of ultra-low emission of iron and steel in the sintering process? How to choose the change of on-line monitoring system
(Summary description)钢铁超低排放，氮氧化物、烧结烟气超低排放具有重要意义
- Categories:News
- Author:Xi'an Juneng
- Origin:Xi'an Juneng
- Time of issue:2019-06-26 10:28
- Views:
Information
What are the unique techniques for the difficulty of ultra-low emission of iron and steel in the sintering process?
How to choose the change of on-line monitoring system?
How to choose the change of on-line monitoring system?
While realizing ultra-low emission of sintering flue gas, we should guard against the misunderstanding of achieving ultra-low emission at all costs.
The ultra-low emission of sintering flue gas should meet the requirements of low resource energy consumption, low pollutant emission and low ecological damage in the whole life cycle.
Therefore, the development of the technical system of source and process emission reduction and end treatment is of great significance for the realization of ultra-low emission of sintering flue gas.
1. Reduction technology of sintering flue gas and pollutants.
The air leakage of the sintering machine is related to the internal and external pressure difference P of the bellows system and the gap δ between the mobile trolley and the bellows. P is determined by the negative pressure in the bellows, and the negative pressure in the bellows is determined by the resistance of the sinter mixture. δ is closely related to clearance position, sealing structure, manufacturing, operating conditions and so on. It can be seen that the key to reduce the air leakage of the sintering system is to improve the air permeability of the sinter layer by strengthening the preparation of raw materials and strengthening mixing granulation, and to develop advanced sealing technology to reduce the air leakage gap between the dynamic and static joint of the equipment.
The ultra-low emission of sintering flue gas should meet the requirements of low resource energy consumption, low pollutant emission and low ecological damage in the whole life cycle.
Therefore, the development of the technical system of source and process emission reduction and end treatment is of great significance for the realization of ultra-low emission of sintering flue gas.
1. Reduction technology of sintering flue gas and pollutants.
The air leakage of the sintering machine is related to the internal and external pressure difference P of the bellows system and the gap δ between the mobile trolley and the bellows. P is determined by the negative pressure in the bellows, and the negative pressure in the bellows is determined by the resistance of the sinter mixture. δ is closely related to clearance position, sealing structure, manufacturing, operating conditions and so on. It can be seen that the key to reduce the air leakage of the sintering system is to improve the air permeability of the sinter layer by strengthening the preparation of raw materials and strengthening mixing granulation, and to develop advanced sealing technology to reduce the air leakage gap between the dynamic and static joint of the equipment.
2. The technology of reducing the resistance of sinter layer.
The conventional quicklime digestive system has some problems, such as poor digestibility, short time, difficult dedusting and so on, which limits the application of this technology. Double-stage double helix stirring quicklime digestion technology and equipment, the whole digestion process is divided into two stages (primary pre-digestion and secondary full digestion, as shown in figure 1), which prolongs the digestion time, improves the digestion process and improves the digestibility. On the basis of single screw, it adds a spiral rotor to form a biaxial stirring form, which has multiple functions and functions such as stirring, crushing caking and self-cleaning, and greatly improves the stirring frequency and digestion reaction speed.
According to the characteristics of strong adhesion, hydrophilicity, high dispersion and hydraulic property of dust produced in the digestion process of quicklime, a compound wet dedusting technology was developed.
The double-stage double screw agitated quicklime digester and the matching compound wet dust collector were put into operation in Xinyu Iron and Steel No. 6 sintering machine at the end of 2016, the digestibility reached 87.5%, and the effect of mixture granulation was improved. the annual output of sinter is 80,000 tons, the dust emission concentration is as low as 9.87mgxm3, the environment of the batching room is obviously improved, and the dust removal wastewater from the digestive system is discharged "zero".
3. Strengthen the mixing granulation technology.
According to the different structure, the strong mixer can be divided into horizontal mixer and vertical mixer.
In the working process of the horizontal strong mixer, the cylinder is fixed and the spindle rotates to drive the movement of the plow head, so that the material is convective and fully mixed.
During the working process of the vertical power mixer, the rotating mixing barrel and the high-speed rotating agitator
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