采用组合式一次风管的制粉系统设计  

Design of Milling System Using Combined Primary Air Pipe

作　　者：闫顺林[1] 韩韦[1] 刘洋[1] 张永昇 王皓轩[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《电力科学与工程》2017年第8期60-66,共7页Electric Power Science and Engineering

摘　　要：常规的制粉系统一次风管总截面积无法调节,导致锅炉低负荷运行时一次风气流中煤粉浓度较低,燃烧不稳。针对这一问题提出了组合式一次风管的设计,该设计中对应单个燃烧器采用多管组合式送粉管道,并将对应的燃烧器改造为与管径相匹配的多喷口燃烧器,通过控制组合式送粉管道上的阀门,开关不同的送粉管来调节总的通流面积。根据这一设计分别给出了采用组合式一次风管的半直吹乏气送粉系统、半直吹热风送粉系统、中间储仓式乏气送粉系统和中间储仓式热风送粉系统流程图。采用组合式一次风管的制粉系统送粉管道总截面积可以随负荷变化而调节,当锅炉负荷降低煤粉量减少时亦减小送粉管道截面积,即维持最佳煤粉浓度保证稳定燃烧又维持一次风速在规定范围内防止煤粉沉积。In conventional pulverizing system, the total cross sectional area of primary air pipe cannot be adjusted, which leads to too low the concentration of pulverized coal in primary air flow and instability of combustion at low load operation. This paper presents a design of combined wind pipe, in which a muhi-tube combined powder feeding pipe- line is adopted for the individual burner, and the corresponding burner is transformed into a multi-nozzle burner matched with the pipe diameter. By controlling the valve on the pipeline and the switch of different powder feeding tube, the total flow area is then adjusted. Four systems, namely the semi direct blowing air feed system, semi direct blowing hot blast powder feeding system, intermediate storage type air feed system and intermediate silo hot blast pow- der delivery system, are presented according to the design respectively. The total cross sectional area of the pulverized coal conveying system with combined primary air duct can be adjusted with the change of load. When the boiler load as well as the pulverized coal quantity are reduced, the sectional area of the powder feeding pipeline is also reduced; that is to say, the design could not only maintain the best concentration of pulverized coal to ensure stable combustion, but also maintain a single wind speed within a specified range to prevent the coal dust deposition.

关 键 词：最佳煤粉浓度 组合式一次风管 制粉系统 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]