摘要
工业煤粉锅炉在煤粉储仓向中间仓卸料过程中,经常出现炉膛负压波动增大的现象,带来安全隐患;煤粉燃料供给不稳定是引起炉膛负压波动增大的原因之一。为解决此问题,结合工业煤粉锅炉系统中对供料稳定性与均匀性的要求,以能量守恒定律与动量定理进行分析;认为引起波动的主要因素为煤粉的自由落体运动对物料面产生不均匀冲击,并传导至中间仓底部,导致中间仓底部的煤粉堆密度不断变化,使得下游螺旋供料器的实际受料量随之改变,引起供料不稳定。以增加煤粉在中间仓的流动路程为设计原则,重新设计中间仓的内部结构,增加了伞帽的设计。经过实际测试,证明中间仓内部结构的改造有效,但实际应用中,伞帽的设计仍有改进空间。最后结合实际运行维护的便利性及可操作性,提出了在中间仓内部设计固定伞帽配合导流板方案,使中间仓的内部结构满足理论需要,具备可操作性,有效缓解了落料冲击的问题。
When the industrial pulverized coal boiler pulverized coal bunker is discharged into the intermediate bin, the negative pressure fluctuation of the furnace often increases, which brings potential safety hazard. The instability of pulverized fuel supply is one of the reasons for the increase of negative pressure fluctuation in the furnace. In order to solve this problem and understand the working characteristics of the spiral conveyer feeder, the energy conservation law and the momentum theorem were analyzed in combination with the requirements of the stability and uniformity of the supply material in the industrial pulverized coal boiler system. It was considered that the main factor cau- sing the fluctuation was the unequal impact of the free falling body movement of pulverized coal on the material surface and conduction to the bottom of the intermediate bin, which leaded to the constant change of the density of the pulverized coal pile at the bottom of the middle silo, and made the actual material amount of the downstream spiral feeder change. At last, it caused the unstable supply of the feed. In order to increase the flow distance of pulverized coal in the intermediate warehouse ,the internal structure of the intermediate bin was redesigned and the design of the umbrella cap was added. The actual test proves that the transformation of the internal structure of the intermediate warehouse is effective, but in practical application, the design of the umbrella cap still has room for improvement. Finally, combined with the convenience and maneuverability of the actual operation and maintenance, a scheme was proposed to design a fixed umbrella cap and a diversion plate in the middle of the middle storehouse. It prores that internal structure of the intermediate storehouse meets the theoretical needs, and it is practieal, and effectively alleviates the problem of the impact of the blanking.
作者
王实朴
李殿新
罗伟
裘星
于海鹏
WANG Shipu;LI Dianxin;LUO Wei;QIU Xing;YU Haipeng(China Coal Research Institute Company of Energy Conservation,Beijing 100013 ,China)
出处
《洁净煤技术》
CAS
2018年第3期134-138,共5页
Clean Coal Technology
基金
煤粉工业锅炉浓相低脉动圆盘供料器研发项目(2017CX01)
关键词
工业煤粉锅炉
落料冲击
螺旋输送机
炉膛负压波动
固定伞帽
旋转伞帽
industrial pulverized coal boiler
blanking impact
screw conveyer
negative pressure fluctuation of furnace
fixed an umbrellacap
rotating umbrella hat
