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1、铁岭发电厂#4 机组送风、引风控制系统 - -I 中文摘要 风量是锅炉运行质量的重要指标之一，风量过高或过低都会影响电厂的安全 性、经济性，必须通过自动化手段加以控制。风量控制的任务是：送风量是当机 组负荷变化时要保证燃烧过程中有合适的燃料与风量的比例关系，确保燃烧的经 济性和稳定性。引风量是保持炉膛压力稳定在给定值，确保燃烧的安全性。 风量调节方法采用开大或关小风机动叶或挡板的调节方法。送风控制系统在 平衡状态下，协调来的送风指令与修正后的风量信号相等，调节器的偏差为零， 输出不变，送风机动叶保持在某一位置，烟气含氧量为最佳值。当增加负荷时， 送风指令增加，调节器输入有正偏差，积分作用使送风
2、挡板开大，增加送风量直 至与送风指令相等，调节器输出不变。上述过程是比较快的，可以看作是粗调。 在送风内回路控制过程结束后，烟气含氧量也开始变化。当烟气含氧量大于最佳 值时，说明送风量过大，此时调节器输出增加，即送风修正系数增大，总风量信 号增大，使调节器输入偏差为负，去关小送风机挡板开度以减少送风量。同理， 当含氧量小于最佳值时，控制系统动作去开大送风机挡板以增加送风量。引风控 制系统是，当负荷改变时，锅炉主控发出改变引风量的指令，引风调节器根据偏 差运算，输出改变引风机挡板的信号。 本文正文共分六部分，第一部分是引言，主要对课题背景、选题意义进行简 单介绍。第二部分与第三部分从本设计系统出
3、发，阐述送风自动控制系统与引风 自动控制系统，介绍了关于送引风系统的调节、投运及在火电厂中的应用等内容。 第四部分为设计思想，主要讨论本系统应采用什么样的控制方案。第五部分为实 例分析，对 SAMA 图的分析，对逻辑图的分析，便于工作人员更好的理解。第六 部分为结论，对本文的高度概括。 关键字：送风量 ，引风量，挡板调节 沈阳工业大学毕业设计（论文） II Abstract The air flow is a important guideline about circulate molar of boiler. The safety and economy of plant station
4、will be affect when air flow at max or min. It must be controlled with automatic measure. The assignment of air flow control is : feeded draught will assure fuel and air flow have proportion relation at the process of burning. It assure economy and stability. induced draught keep the hearth press at
5、 fixed value. The amount of air regulates adoption to open greatly or closes small air machine to dmp to regulate as a method. At control project , the amount of air regulates the system adoption string class control. feeded draught control system is: Moderate to come under the equilibrium of feeded
6、 draught instruction and revise the breeze of empress quantity signal equality, the deviation of the modulator is zero, output constantly, feeded draught machine to dmp to keep at some one position, the smoke spirit contains amount of oxygen for the best be worth. When the increment carry, feeded dr
7、aught dmd increment, the modulator importation contain positive deviation, the integral calculus function makes to feeded draught to dmp to open greatly, the increment sends to amount of breeze to keep to with feeded draught dmp equality, the modulator outputs constantly. The above-mentioned process
8、 is quicker. We can see it make be thick to adjust. After feeded draught the back track control process be over inside the air, the smoke spirit contains amount of oxygen to also start change. When the smoke spirit contains oxygen to have great capacity in the best value, the elucidation feeded drau
9、ght to measure big, the modulator outputs increment at this time, then feeded draught correction coefficient aggrandizement, total air quantity the signal enlarge, making the modulator input deviation in order to take, close small feeded draught to dmp to open a degree to send amount of air by decre
10、ase. Manage together, be to contain amount of oxygen small in the best value, control system the action open to feeded draught to dmp to send amount of air by increment greatly. induced draught control system is: When the burden change, the boiler lord controls to issue the instruction that the chan
11、ge feeded draught dmd, feeded draught modulator according to the deviation operation, outputting a change to feeded draught dmp signal. In the meantime, this signal sends signal through the dynamic state contact module to induced draught modulator, induced draught modulator to output a size and dire
12、ction with feeded draught to regulate the signal homology to regulate signal, the change induced draught dmp to open a degree. This text is divided into six parts totally, The first part is a preface mainly to the 铁岭发电厂#4 机组送风、引风控制系统 - -III topic background, choose a meaning to carry on simple intro
13、duction. The second part with the third part sets out from this design system, elaborating to feeded draught control system automatically with induced draught control system automatically, introduce concerning send to lead the breeze system to regulate, the hurl luck and in the fire power station of
14、 applied etc. contents. Four-part is divided into a design thought, main discussion originally the system should adopt what kind of control project. The fifth part is analytical for solid example, to the analysis of the SAMA diagram, to the analysis of the logic diagram, easy to staff member better
15、comprehension. The sixth part is a conclusion, generalizing to the textual height. keywords: induced draught，feeded draught，dmp adjust 铁岭发电厂#4 机组送风、引风控制系统 - -1 目目 录录 中文摘要中文摘要I ABSTRACT.II 1 引言引言 .1 11 课题背景1 12 选题意义1 2送风自动控制系统送风自动控制系统 .3 21 送风量控制系统3 22 风机的喘振4 23 送风自动调节系统分析5 24 送风调节系统的自动投运6 25 送风控制系统在
16、火电厂中的应用8 3引风自动控制系统引风自动控制系统 .10 31 引风量控制系统10 32 引风自动调节系统分析10 33 引风控制系统在火电厂中的应用11 4 设计思想设计思想 .13 41 控制方案13 411 送风控制系统的设计.13 412 引风控制系统的设计.13 5控制系统控制系统 SAMA 图及逻辑图分析图及逻辑图分析15 51 SAMA 图符号与逻辑图功能码说明15 52 图纸分析15 521 测量回路.15 522 空气流量指令形成回路.16 523 送风机动叶控制回路.16 524 引风机挡板控制回路.17 525 送风、引风控制系统逻辑图分析.19 6 结论结论 .23 参考文献参考文献 .24 致谢致谢 .25 附录附录 .26 铁岭发电厂#4 机组送风、引风控制系统 - -1 1 引言 11 课题背景课题背景 火力发电厂在我国电力工业中占有主要地位，是我国重点能源工业之一，大 型火力发电机组在国内外发展很快，是我国现以 300MW 机组为骨干机组，并逐 步发展 600MW 以上机组。目前，国外已建成单
