The Applied Research Of Large Diameter Three-product Dense Medium Cyclone By Unpressurized Feeding In The Power Coal Preparation Plant

Xieqiao new coal preparation plant based on coal quality and washability of the end of coal, choose to use3GDMC1400/1000AP non-pressurized feed three products heavy medium cyclone coal preparation technology and equipment, which is the first use of3GDMC1400/1000AP no pressurized feed three-product cyclone in Power Coal Preparation Plant.This article first introduces the important position of the modern and contemporary coal preparation and direction of development, as well as domestic and foreign large-diameter dense medium cyclone research progress. Next, it explains the purpose and significance of research and technical problems to be solved. Then details operating principle, structure parameters and technical characteristics of non-pressurized feed three products heavy medium cyclone. The paper highlights large-scale efficient simplified thermal coal separation technology at the core of3GDMC1400/1000AP type without pressure feeding three-product dense medium cyclone.Finally,starting from the Xieqiao coal preparation plant steam coal washability characteristics and users actual needs,this paper discusses the6～0mm size all enter the cyclone(coals without sieve slit6mm Bo screening level, all direction to the cyclone), all do not enter the cyclone (selected raw coal after screening level after the6mm sieve slit Bo, only sieve material into the cyclone, sieve matter directly into the cyclone as a clean coal product) and some(coals after screening level after the6mm sieve slit Bo, all screen on the matter and part of the screen material into the cyclone) three cases; and the problem of suspension density, feed pressure, handling capacity and other operating parameters, and conclude that the best choice.Through practice, we have achieved the advanced technical and economic indicators (50～0mm all selected, for example, the coals without screening level after Bo all enter the cyclone):single machine processing capacity of455t/h; use of1.450kg/L density of heavy medium suspension realized the1.829kg/L high density sorting; characterization of sorting accuracy of the possible deviation Epm=0.027kg/L, concentrate ash content18.47%, gangue content80.83%, gangue with coal0.93%, coal with gangue1.70%; effectively sorting the grain size limit of0.25mm (0.5～0.25mm possible deviation Epm=0.049kg/L), the whole plant to the successful completion of the indicators of an annual handling capacity of3.0Mt of raw coal, and put into operation a year, a profit of54.7947million yuan.The application of3GDMC1400/1000AP type without pressure feeding three-product dense medium cyclone coal preparation technology and equipment has enriched and developed with our own intellectual property rights of large, efficient, simplified heavy-medium coal preparation technology in power coal preparation plant. It consolidated the international leading position of heavy medium cyclone coal preparation technology.