First, the characteristics of fly ash
The particles composition of fly ash. In accordance with the fly ash particle morphology, the fly ash particles are divided into: glass beads; sponge-like vitreous body (including the smaller particles and more dense, pore vitreous and particles, porous vitreous); carbon particles . Bead content of fly ash of power plant emissions in China is not high, most of the sponge-like vitreous, the particle size distribution is very uneven. Grinding processing, destruction of the morphology of the original fly ash, make it more uniform particle size broken polyhedron, increase its specific surface area, thereby increasing its surface activity, improve their performance differences.
Second, the fly ash application
Fly ash can be used as cement, mortar, concrete admixtures, and become a component of cement, concrete, fly ash as a raw material instead of clay to produce cement clinker raw materials, manufacturing, sintered bricks, autoclaved aerated concrete, foam concrete, hollow brick, sintered and non sintered ceramsite paved road; build a dam, the construction of the port, farmland potholes lowlands, coal mining subsidence area and the mine backfill; from sorting floating beads, beads, fine iron powder, carbon, aluminum and other useful material, including floating beads, the beads can be used as insulation materials, refractories, plastics, rubber and filler.
Third, the prospect of fly ash dryer
In coal-fired boilers system of power plants, fly ash emissions can be divided into dry discharge and wet discharge. At present, the developed areas in the cement industry, such as Jiangsu, Shandong, Zhejiang, Hebei, dry fly ash as an admixture in cement production, and the prices, has shown a trend in short supply, jumped to a resource; wet fly ash each item physical and chemical properties of dry fly ash, only because the big water (up to 45%), can not meet the requirements of the cement production, the attention of the market, can only be stacked in the wet gray library, a greater accumulation seriously pollute the environment. With the continuous optimization of the national industrial policy, environmental regulations become increasingly harsh, the proper handling of wet fly ash has been put on the agenda. Only the wet fly ash with reasonable energy consumption, simple process for drying so that moisture is low in order to change waste into treasure, and to achieve social and commercial benefits. The fly ash drying machine is widely used to solve the fly ash pollution and disposal problems, but also to make fly ash waste into treasure, an increase of economic benefits.
Four, working principle and performance characteristics of the fly ash dryer
The fly ash drying machine is suitable for fly ash, phosphogypsum, and titanium gypsum and other industrial dust, the dry residue, and its working principle is as follows: powdered or granular fly ash are transported by belt feeder to feed into fly ash conveyor feeder to the drying drum, and fly ash cloth copy board flip in the drying drum, uniform dispersion of full contact with the hot air to reach the heat transfer, mass transfer in drying purpose. Dry fly ash in roller terminal unloader are discharge to become finished products. The output of dry goods complete the drying process by the belt feeder.
The fly ash drying equipment, for the fly ash the beginning of water than other materials, the proportion is smaller than other materials, the characteristics of the mobility changes in the drying process is designed. With compact structure, half of the footprint of the same production single cylinder drying, reliable operation, low energy consumption, high thermal efficiency, the effect of drying materials, and easy to automate control operator.
1, the outlet temperature is low, the dust removal equipment to use for a long time.
2, the new combined Yang feeding device, can easily control the desired final moisture indicators based on user requirements.
3, the high degree of automation, easy operation, stable operation.
4, Equipment investment required is 1/6 of the imported product, small investment, fast return.
5, the supporting wheel rotation, transmission power.
6,Less than monocular dryer covers an area of ??about 50%, construction investment is about 50% lower power consumption less than 60%.
7, the fuel can be adapted to coal, oil, steam.
Should be noted that in the fly ash drying system design
1, the beginning of water control. Just wet fly ash emitted from a power plant water is generally about 45%. Then immediately drying, production costs also constitute greater pressure of the equipment. Stacked in a well ventilated place about 15 days, the water dropped to about 20%, and then processed.
2 precipitator selection. Fine fly ash particles, light density after drying in vacuum state, susceptible to airflow away, resulting in fluid medium change, and the dusty gas water.Precipitator shall be based on the status of the above process to choose.
3, dry material handling equipment should be sealed.
4, the choice of the hot stove. Hot stove should be used in high efficiency, fully fueled with low grade coal, to facilitate operation of the furnace.
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By Hans from Pixabay