水煤浆循环流化床锅炉物料平衡特性模型  

Modeling of mass balance behavior in a coal water slurry fired circulating fluidized bed boiler

作　　者：柯希玮 张缦[1] 杨海瑞[1] 吕俊复[1] 张建春[2] 刘爱成[2] 郭学茂[2] 翟永军[2] 赵晓星[2] KE Xiwei;ZHANG Man;YANG Hairui;Lü Junfu;ZHANG Jianchun;LIU Aicheng;GUO Xuemao;ZHAI Yongjun;ZHAO Xiaoxing(Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Taiyuan Boiler Group Co.Ltd.,Taiyuan 030000,China)

机构地区：[1]清华大学能源与动力工程系,北京100084 [2]太原锅炉集团有限公司,山西太原030000

出　　处：《中南大学学报（自然科学版）》2021年第1期86-95,共10页Journal of Central South University:Science and Technology

基　　金：山西省科技重大专项(20181102001)。

摘　　要：为了解水煤浆循环流化床(CFB)锅炉的物料平衡特性,建立一维CFB锅炉模型进行模拟研究,并重点探究分离器效率和水煤浆入炉粒度的影响规律。研究结果表明:当分离器效率低时,炉内平均床料粒度较大,即床质量较低,循环量较小,锅炉整体物料循环性能较差,此时,尽管存在最优水煤浆粒度分布使当前条件下的物料循环性能达到相对最佳,但总体上看水煤浆粒度的影响较小,工程上应更专注于改善分离器性能;而当分离器效率提高时,水煤浆粒度的影响逐渐变得显著,且最优水煤浆粒径分布往细颗粒方向偏移。因此,当分离器效率足够时,可考虑适当降低水煤浆粒度,以进一步提高床质量和循环量。高效分离器+细水煤浆的参数组合能够获得较好的物料循环性能,这为水煤浆CFB锅炉的运行优化提供了方向。In order to study the mass balance characteristics of the circulating fluidized bed(CFB)boiler burning coal water slurry(CWS),an efficient 1-dimensional CFB boiler model was developed.The effects of cyclone efficiency and particle size of injected CWS on the mass balance were emphatically discussed.The results show that when the cyclone efficiency is lower,the average size of bed materials inside furnace becomes larger,namely,the bed quality is lower,and the solid circulation rate decreases.For the CFB boiler equipped with low efficiency cyclones,though there exits an optimal CWS particle size distribution to reach the best performance of solid circulating loop,the influence of CWS particle size is relatively small,hence,the cyclone efficiency is the more important factor in engineering.However,when the cyclone efficiency increases,the influence of CWS particle size becomes more obvious,and the optimal CWS particle size can be smaller.Therefore,if the cyclone efficiency is enough,it can be considered to reduce the injected CWS particle size to further increase the bed quality and solid circulation rate.It indicates that applying high efficiency cyclones plus fine CWS particles can obtain satisfactory performance of solid circulating loop in engineering,which provides a solution to the operation optimization of the CWS-fired CFB boilers.

关 键 词：水煤浆 循环流化床 模型 分离器效率 粒度 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程]