ZHANG Ping;CHEN Lujian;JIANG Hua;ZHANG Man;XU Wei;LIU Shi;YANG Hairui;LYU Junfu;

• 1:Guotou Panjiang Power Generation Co.
• 2:Ltd.
• 3:State Key Laboratory of Power Systems
• 4:Department of Energy and Power Engineering

Abstract：

Large proportion of coal slime co-combustion in CFB boilers is an effective means to treat low quality coal such as coal slime. A one-dimensional chamber model was used to simulate the operating conditions of a CFB boiler with different proportions of coal slime co-combustion. The effects of blended coal slime ratio on the average particle size in CFB boiler furnace,the residence time of particle in furnace and the material concentration of upper furnace were studied,and the optimal operation condition on flow regime under the condition of large proportion of coal slime was determined. The simulation results show that increasing the proportion of coal slime can increase the material circulation flow rate and the residence time of particles in the intermediate size range( 0.1-0.3 mm) in the furnace,and improve the burnout rate of fuel. Increasing the proportion of coal slime can increase the particle concentration of upper furnace,which is beneficial to improve the heat transfer in the upper part of the furnace,reduce the temperature of the furnace,and control pollutants.Based on the operation data of large proportion of coal slime co-combustion in a 300 MW circulating fluidized bed boiler unit in Panbei Power Plant,the effects of proportion of coal slime co-combustion on bed temperature,exhaust gas temperature,carbon content of bottom slag and fly ash were analyzed. When the boiler load is at 300 MW,the bed temperature obviously decreases after the blended coal slime being burned,the carbon content of the fly ash and the smoke exhaust temperature increase with the proportion of blended coal slime increased,and the carbon content of the bottom slag decreases with the proportion of blended coal slime increased. In order to achieve the goal of large proportion of coal slime co-combustion,it is recommended to control the coal particle size of gangue,and it is necessary to strengthen the tail soot blowing or adjust the tail heating surface appropriately.

Key Words： CFB;large proportion;coal slime;co-combustion;material balance

Abstract:

Keywords:

Foundation: 国家重点研发计划资助项目(2016YFB0600203)

Authors: ZHANG Ping;CHEN Lujian;JIANG Hua;ZHANG Man;XU Wei;LIU Shi;YANG Hairui;LYU Junfu;

DOI: 10.13226/j.issn.1006-6772.19103101

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