用于煤炭制样中的气悬切割式制粉机的开发研制
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摘要
为解决煤炭制样粉碎过程中存在煤样压片、筛板堵塞、制粉机内易残留的问题,开发1种用于煤炭制样中的气悬切割式制粉机,采用无筛网、立式、高转速切割设计以避免煤样压片和筛板堵塞的问题,煤样在高转速、立式切割过程中自上而下在气流中切割以解决传统制粉机内易残留的问题。为验证新开发的气悬切割式制粉机的可行性,依据相关国标对其进行0.2mm过筛率试验、煤样回收率试验以及与国家标准制样方法对比的可替代性试验,结合准确度和精密度分析可知:其0.2mm过筛率可达100%,回收率平均控制在99%以上;与国标煤炭制样方法的对比试验表明,该制粉机的性能满足国家标准的准确度和精密度要求,可应用于全自动制样系统中。
In order to solve the problems of crushing the thin piece,blockage of sieve plates,residue in crushers in the crushing process of coal sample preparation,a type of air suspension cutting powder preparation machine used for coal sample preparation was developed,the design of non-sieve screen,vertical and high speed cutting was adopted to avoid crushing the thin piece and blockage of sieve plate,and in the process of high speed and vertical cutting,coal sample was cut from top to bottom in the airflow,the problem of easy residue in traditional powder preparation machine was solved.In order to test the feasibility of the air suspension cutting powder preparation machine,on the basis of relative national standards,the 0.2 mm screening test,the recovery rate of coal sample test and alternative trials compared with national standard sample preparation method were done,and combining with the accuracy and precision analysis we can see that:the screening rate of 0.2 mm could reach 100%,the recovery rate was basically controlled over 99%;through the substitutability test with the national standard method,it was shown that the powder preparation machine could meet the requirements of accuracy and precision of national standard,it could be applied to the automatic sample preparation system.
In order to solve the problems of crushing the thin piece,blockage of sieve plates,residue in crushers in the crushing process of coal sample preparation,a type of air suspension cutting powder preparation machine used for coal sample preparation was developed,the design of non-sieve screen,vertical and high speed cutting was adopted to avoid crushing the thin piece and blockage of sieve plate,and in the process of high speed and vertical cutting,coal sample was cut from top to bottom in the airflow,the problem of easy residue in traditional powder preparation machine was solved.In order to test the feasibility of the air suspension cutting powder preparation machine,on the basis of relative national standards,the 0.2 mm screening test,the recovery rate of coal sample test and alternative trials compared with national standard sample preparation method were done,and combining with the accuracy and precision analysis we can see that:the screening rate of 0.2 mm could reach 100%,the recovery rate was basically controlled over 99%;through the substitutability test with the national standard method,it was shown that the powder preparation machine could meet the requirements of accuracy and precision of national standard,it could be applied to the automatic sample preparation system.
引文
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[3]马元坤.BBD4360型双进双出磨煤机制粉特性的试验研究[J].发电设备,2014,28(1):15-18.
[4]仝学军.球磨机制粉系统出力下降的因素与对策[J].油气田地面工程,2013,32(1):88-89.
[5]顾怀本.电站锅炉制粉系统出力降低的原因分析[J].电力科学与工程,2010,26(1):66-70.
[6]周青,李小江.影响煤炭联合制样设备制样偏差的因素及其检验方法[J].热力发电,2011(5):30-34.
[7]石书雨,郑善合,王罡,等.锅炉制粉系统计算中的几个问题[J].电站辅机,2009,30(2):25-27.
[8]张宝田.对锅炉粉煤制备系统取样装置改进的尝试[J].甘肃有色金属,1998(2):61-62.
[9]孙刚.商品煤采样与制样[M].北京:中国标准出版社,2012:149-164.
[10]全国煤炭标准化技术委员会.煤炭机械化采样:GB/T 19494-2004[S].北京:中国标准出版社,2004:10.
[11]全国煤炭标准化技术委员会.煤的工业分析方法:GB/T 212-2008[S].北京:中国标准出版社,2009:04.
[12]全国煤炭标准化技术委员会.煤炭制备方法:GB474-2008[S].北京:中国标准出版社,2009:05.
[13]全国煤炭标准化技术委员会.煤和焦炭试验可替代方法确认准则:GB/T 18510-2001[S].北京:中国标准出版社,2002:08.