plc循环流化床锅炉蒸汽温度控制系统设计.docVIP

plc循环流化床锅炉蒸汽温度控制系统设计 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 #39;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. 由于技术必威体育官网网址的原因，目前国内外还没有公开的可以真正用于工程使用的循环流化床锅炉设计方法。现在流行的设计思想和方法仍旧沿用鼓泡床的概念，甚至有些概念是模糊的。因此对循环流化床锅炉设计思想和方法进行研究具有重要的学术价值和实践意义。 目前，循环流化床锅炉已经在国内外进入商业规模的运行。但是，在已运行的循环流化床锅炉中暴露出不少问题，尤其是国内的循环流化床锅炉。造成这种现象固然有安装和运行方面的原因，但在设计方面也存在不少问题。由于对循环流化床锅炉的机理理解不够深入正确，导致设计原则和