Conveyor flights for rotary kiln
阅读：372发布：2024-02-25
专利汇可以提供Conveyor flights for rotary kiln专利检索，专利查询，专利分析的服务。并且A method for producing heat exchange between particles of raw materials and hot combustion gases in an inclined rotary kiln is disclosed. The kiln includes trough-shaped conveyor flights constructed to discharge the particles over the length of the kiln in the form of clouds of substantially parallel vertical curtains extending across the kiln at an acute angle to the axis of the kiln. The kiln can be used in a plant including means for collecting and returning the material carried out of the kiln.，下面是Conveyor flights for rotary kiln专利的具体信息内容。
1. A method for producing heat exchange between particles of raw materials and hot combustion gases in an inclined rotary kiln comprising the steps of moving said particles down the kiln toward the hot zone thereof, alternately lifting and dropping said particles during their passage down the kiln to produce clouds of falling particles in the form of substantially parallel vertical curtains each extending across the kiln at an acute angle to the axis of the kiln to cover substantially the total cross-sectional area of the kiln and each having a sufficient density to relieve gases entering said curtains of suspended particles and to entrain new particles from the curtains to form gases supersaturated with particles, before reaching and during through the next curtain precipitating particles from the supersaturated gases, separating the particles suspended in the gases leaving the last curtain; and returning the particles separated from the last curtain to said kiln.
2. A method according to claim 1 in which the material is cement raw meal which is formed into the transverse curtains while being preheated and calcined.
3. A method according to claim 2 in which the free flow of the material down the bottom of the kiln is checked several times in the preheating and calcining zones of the kiln.
4. A rotary kiln for producing heat exchange between particles of raw materials and combustion gases, said kiln comprising a plurality of trough-shaped conveyor flights extending helically along the inner wall of the kiln from the upper end over a length of the kiln at least equal to five times the internal diameter of the kiln, said conveyor flights being constructed to contain, lift and discharge sufficient amounts of material to produce clouds of falling particles in the form of substantially parallel vertical curtains each extending across the kiln at an acute angle to the axis of the kiln to cover substantially the total cross-sectional area of the kiln.
5. A rotary kiln according to claim 4 including barriers, said barriers provided to stop the flow along some or all of the flights.
6. A rotary kiln according to claim 5 in which dam rings are provided in the zone in which the transverse curtains are formed to check the flow of the material along both the bottom of the kiln and the flights.
7. A rotary kiln according to claim 4 in which the flights form an angle of between 15* and 25* with the generatrix of the kiln tube.
8. A rotary kiln plant according to claim 4 further including means for collecting and returning material carried out of the kiln.
9. A rotary kiln plant according to claim 8 in which a single cyclone is provided to receive all the gases from the kiln and the material carried by them, and the material outlet of the cyclone is directly connected to a feed pipe for the raw material.
10. A rotary kiln plant according to claim 9 including an electrostatic precipitator and means for returning the dust precipitated to the kiln.
11. A rotary kiln plant according to claim 9 including means for introducing raw material collected from the hot gases into a riser pipe connecting the kiln to the cyclone.
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