振动逆流干法降灰脱粉技术与火电厂制粉系统的集成研究

摘要

This paper introducesthe basic working principle of vibrating adverse-flow fluidized bed for coal separationand fines removal technology .Combined with technology characters of three common pulverizing systems in coal-fired power plants-middle coal bunker ,pressurizeddirect ,negative-pressurized direct ,the feasibility of the integration of this technology with pulverizing system in coal-fired power plants is analyzed .Based on that ,the process routes of this integration technology were proposed ,which could simultaneously achieve dehydration ,separationand fine removal of raw coal online .Coal quality and grinding efficiency would be enhanced .Laboratory research system of vibrating adverse-flow fluidized bed on coal separationand fines removal technology was introduced .Separationexperiments on one coal sample have been done with this system ,which was from a coal-fired power plant in Australia .Resultsshowed :clean coal with 29% ash content can be separated from 13~0mm rawcoal with 49 .62% ash content ,theyield was 62% ,and quantity efficiency was 94% .%介绍了振动逆流干法降灰脱粉技术的基本工作原理，结合火电厂常见的中仓式、正压直吹式和负压直吹式制粉系统的工艺特征，分析将振动逆流干法降灰脱粉技术与火电厂制粉系统集成的可行性，并提出了技术集成的工艺路线。分析表明，集成后的工艺路线可同时实现电厂燃煤原煤的在线干燥、降灰、脱粉，提高燃煤品质和磨煤效率。应用振动逆流干法降灰脱粉技术试验研究系统对澳大利亚某火电厂用煤进行了降灰试验。结果表明：可将灰分为49．62％的13～0mm难选原煤降灰至29％，产率为62％，数量效率为94％。