洁净煤技术

2020, v.26;No.128(04) 168-174

[打印本页] [关闭]
本期目录(Current Issue) | 过刊浏览(Past Issue) | 高级检索(Advanced Search)

循环流化床锅炉高效炉内脱硫理论和关键技术
Theory and key technologies of high efficiency desulfurization in circulating fluidized bed boilers

谭波;王传志;司硕;刘忠攀;蓝天;
TAN Bo;WANG Chuanzhi;SI Shuo;LIU Zhongpan;LAN Tian;The Engineering and Research Center for Clean Coal Technology,Yankuang Group Co.,Ltd.;Yankuang Technology Company Ltd.;

摘要(Abstract):

低成本、无废水、系统简单的炉内脱硫技术是循环流化床锅炉实现洁净燃烧有效和优选途径之一。由于影响因素众多及试验数据分散,目前仍缺少具有普遍适用的脱硫效率预测手段,对于实际应用过程中脱硫效率随Ca/S比增加出现下降现象的原因还未给出合理解释,单纯Ca/S比也无法反映实际参与脱硫的石灰石量,因而难以描述炉内石灰石的脱硫规律。为了探索决定炉内石灰石脱硫效率的本质,以锅炉炉内物料运动、分布规律为基础,通过探讨入炉石灰石随炉内物料运动及反应变化情况,对循环流化床炉内脱硫进行深入分析,提出"石灰石有效存有量"的概念,并根据灰平衡原理建立数学模型。通过与不同规模的燃烧颗粒煤和煤泥的工业循环流化床锅炉试验数据进行比较,验证了该模型的有效性。研究结果表明,实际决定炉内脱硫效率的最重要因素是"石灰石有效存有量",该理论的建立为有效提高炉内脱硫效率提供了依据,由此得出实现炉内高效脱硫的关键在于:①优化石灰石粒度分布以有效提高外循环石灰石量和石灰石炉内的停留时间;②合理排渣以减少石灰石有效存有量的损失;③提高气-固接触效率以充分利用有效石灰石的活性。
Desulfurization technology is one of the most effective and optimal way to achieve clean coal combustion in circulating fluidized bed boilers,which is low-cost,no wastewater produced and simple to operate.In addition,there are many influencing factors and the reported data is significantly scattered,which make it too difficult to derive a generalized approach to predict the desulfurization performance,and there is not a reasonable explanation for this seemly abnormal declination in desulfurization efficiency with increasing Ca/S ratio in the process of practical application,and the simple Ca/S ratio cannot be fully represent the amount of limestone actually involved in desulfurization,it is difficult to fully describe the desulfurization law of limestone in the furnace. Based on the movement and distribution law of materials in the boiler,the new concept of"effective limestone inventory"was proposed in order to explore the essence of determining the desulfurization efficiency of limestone in the furnace,and through comprehensive analysis on desulfurization in circulating fluidized bed boilers.A mathematical model was established according to the principle of ash mass balance.The validity of model was validated by comparing with the experimental results of industrial circulating fluidized bed boilers with different scale burning coal particles and coal slime.The results reveal that the key factor that actually determines the desulfurization efficiency in CFB boilers is"the effective limestone inventory".This theory and model provide significantly useful guideline for effectively improving the desulfurization efficiency in the furnace.Based on the theory,it concludes that the key technologies to achieve efficient desulfurization in the furnace include:( 1) optimizing the limestone particle size distribution to effectively increase the limestone quantity in the external circulation and the residence time in the limestone furnace;( 2) smoothing the way to discharge the bottom ash so the loss of the effective limestone can be minimized;( 3) improving the gas-solid contact efficiency so the activity of the effective limestone can be fully utilized.

关键词(KeyWords): 循环流化床锅炉;高效炉内脱硫;石灰石有效存有量;气-固接触效率
circulating fluidized bed boiler(CFB);high efficiency desulfurization in furnace;effective limestone inventory;gas-solid contact efficiency

Abstract:

Keywords:

基金项目(Foundation): 兖矿集团有限公司重大科技专项资助项目(YK2017ZD04)

作者(Author): 谭波;王传志;司硕;刘忠攀;蓝天;
TAN Bo;WANG Chuanzhi;SI Shuo;LIU Zhongpan;LAN Tian;The Engineering and Research Center for Clean Coal Technology,Yankuang Group Co.,Ltd.;Yankuang Technology Company Ltd.;

Email:

DOI: 10.13226/j.issn.1006-6772.19042301

参考文献(References):

文章评论(Comment):

序号(No.) 时间(Time) 反馈人(User) 邮箱(Email) 标题(Title) 内容(Content)
反馈人(User) 邮箱地址(Email)
反馈标题(Title)
反馈内容(Content)
扩展功能
本文信息
服务与反馈
本文关键词相关文章
本文作者相关文章
中国知网
分享