摘要:循环流化床锅炉向几十万千瓦级规模的大型循环流化床锅炉发展,循环流化床锅炉在许多单位最长运行周期已达3000小时左右,该炉型再经过一段时间防磨治理,在目前防磨治理的基础上,思想再开阔一些,对磨损原因和机理的探索再认真一些,防范措施、治理力度再加强一些、磨损这一顽症一定能相应治理的更好,其连续运行时间还将延长,达到或超过3500小时没问题,所以对更好设计的要求也愈发强烈。本设计是针对锅炉内蒸汽温度进行控制,主要在控制减温水流量下以控制蒸汽温度。当调节幅度不够时要人工开关旁通阀来帮助调节仍不足使主汽温度调至设定值时要通过增、减二次返料灰来调节。主汽温度偏高时开大返料阀减少二次返料主汽温偏低时关小二次返料灰阀增加二次返料量。此次利用力控软件结合PLC编程得以实现设计。6082
关键字: 蒸汽温度;减温水;力控软件;PLC编程
Circulating fluidized bed boiler steam temperature control system design
Abstract:Circulating fluidized bed boiler to the development of hundreds of thousands of kilowatts a large-scale circulating fluidized bed boiler, Circulating fluidized bed boiler in many units the longest running cycle has reached 3000 hours, The furnace and then after a period of wear governance, Wear governance based on the 'open, the wear causes and explore the mechanism and then some serious precautions, strengthen governance efforts, the better will be able to wear this chronic problem corresponding governance, continuous run timewill be extended to or more than 3500 hours no problem, So better design requirements increasingly strong. This design is for a boiler steam temperature control, mainly to control the steam temperature control Save heated flows. When the amplitude of accommodation is not enough to manually switch the bypass valve to help regulate the main steam temperature to the set value by increasing, less the secondary returning materials ash to adjust. High main steam temperature to open a large back valve to reduce the the secondary feed back main steam temperature low turn secondary returning materials ash valve to increase the secondary return quantity. The use of power control software combined with PLC programming to implement the design.
KeyWords:Steam temperature;Cooling water;Power control software;PLC programming
目录
引言1
1 问题提出 3
2 实验方案的拟定4
2.1 稳定负荷下4
2.2 降负荷 6
3 基本概念和理论基础 7
3.1燃烧控制系统及主蒸汽压力燃烧控制系统 (母管压力)调节系统 7
3.2 主蒸汽温控制系统 8
3.3 汽包水位控制系统 8
3.4 料层差压控制系统 9
3.5 炉膛负压控制系统 9
3.6 执行机构的讨论 10
3.7 结焦现象产生的原因与防止 10
4 设计计算的主要方法和内容 12
5 内容及其分析 18
5.1 工程建立18
5.2创建数据库点参数 19
5.3创建窗口20
5.4创建图形对象21
5.5 动画连接22
5.6 脚本程序编辑 24
5.7 运行26
5.8 实时曲线26
5.9 报警记录28
5.10 PLC编辑32
5.11力控与PLC的连接 34
论文总结37
谢辞38
参考文献40
引言
循环流行化床锅炉技术是近十几年来迅速发展的一项高效低污染清洁燃烧枝术。国际上这项技术在电站锅炉、工业锅炉和废弃物处理利用等领域已得到广泛的商业应用,并向几十万千瓦级规模的大型循环流化床锅炉发展;国内在这方面的研究、开发和应用也逐渐兴起,已有上百台循环流化床锅炉投入运行或正在制造之中。未来的几年将是循环流化床飞速发展的一个重要时期。
保护环境,节约能源是各个国家长期发展首要考虑的问题,循环流化床锅炉正是基于这一点而发展起来,其高可靠性,高稳定性,高可利用率,最佳的环保特性以及广泛的燃料适应性,特别是对劣质燃料的适应性,越来越受到广泛关注,完全适合我国国情及发展优势。 plc循环流化床锅炉蒸汽温度控制系统设计:http://www.751com.cn/zidonghua/lunwen_3429.html