Limestone Integrated handling System
The CFB boiler always applies a multi-desulfurization with both furnace injection desulfurization and simultaneous FGD. In this case, two kinds of specified powder are needful, Shenxiang Machine limestone integrated handling system has been widely used with CFB boiler power plant, which can achieve the application of “one system two finished product”.
Limestone Integrated Handling System
For the high-sulphur coal, the CFB boiler always applies a multi-desulfurization with both furnace injection desulfurization and simultaneous FGD.
Firstly, about 80% of sulfurs will be removed in furnace injection desulfurization, and secondly, FGD will be applied both. Which need two kinds of specified powder, For furnace injection, the particle size shall be a distribution smaller than 1mm, not too big and too small; For FGD, the particle size usually smaller than 325 mesh or 250 mesh, as better as smaller.
Shenxiang Machine limestone integrated handling system has been widely used with CFB boiler power plant, which can achieve the application of “one system two finished product”.
The mill & system can be adjusted to balance the dosage of two kinds of powder. At present, this solution has been applied to China Huadian Group Shuozhou 2*300MW Power Plant and other dozen of power plants, takes on a steady production effect and saves a large number of investments capital and running costs.
Description on process flow:
The First stage---raw material conveying and storage
The limestone material is unloaded into a hopper via forklift or feeding truck, The bar valve under feed hopper will control the feeding material flow, the limestone fall on a vibrating feeder and via a bucket elevator to buffer silo, here the limestone can also been straightly carried to the mill by a belt conveyor.(the difference is the belt conveyor needs a long distance)
The Second stage---Grinding
Limestone falls to metering belt conveyor from buffer silo and then is transmitted to ZMJ Column Mill for grinding(after magnetic separator by self-discharging iron remover); grinded materials will be transmitted to primary classifier (PL Air Classifier) via bucket elevator.
The Third stage---Primary separation
Materials is transmitted to primary classifier (PL Air Classifier) will be separated by the wind with adjusted strength from circulating fan, and the air-solid mixture(limestone less than 1mm) will be transmitted to high-efficiency cyclone collector for collection.
The Fourth stage--- Secondary separation
Then collected powder (less than 1mm) will be hoisted to secondary classifier (SXZ High-efficiency separator) for final separation, and two types(the size 1mm-325 mesh and the size less than 325 mesh) of powder will be obtained and reserved in two silos.
In addition, coarse particles separated by primary classifier (PL Air Classifier) will be conveyed back to ZMJ Column Mill for re-grinding.
The bag dust filter was installed connected to several dust position, the entire system is a closed-negative pressure system, which achieve a very clear operation circumstance without dust emission
Characteristics and advantages:
1. Low power consumption: compared with overseas hammer or impact crusher system and domestic rod mill system, its power consumption falls by 1/3.
2. Less abrasion: compared with overseas relevant preparation system, the wear part consumption is only 1/10 and the service life of wearing parts is longer than 10000h.
3. High quality: running normally without malfunction basically, high serviceability.
4. Excellent performance: particle size of desulfurizing agent meets curve requirements of boiler basically. It's the best product at home and abroad at present.
5. Eco-friendly: noise is lower than 80dB and the system runs under negative pressure without dust.
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