干熄焦过程控制系统的研究及设计

发布时间：2018-03-11 12:03

本文选题：干熄焦　切入点：控制　出处：《华北理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：我们国家越来越重视干熄焦技术的发展,究其原因是干熄焦技术具有三大主要优点:节约能源、保护环境和提高焦炭质量等,此外重大的社会效益和经济效益也是大力发展干熄焦技术的不可或缺的原因。当今干熄焦工艺在国内外发展的很快,不过由于国内的干熄焦技术应用较国外的晚许多,其控制水平仍处于刚刚起步和发展阶段,研究一套干熄焦生产过程控制系统具有十分重要的意义。以迁安中化煤化工有限责任公司的3×140t/h干熄焦项目作为研究背景,针对中化公司现有的实际工艺情况,主要对控制重点和难点进行研究,设计出改善系统控制性能的方案。介绍了干熄控制系统的概况和主要控制功能。针对提升机的调速控制精度问题,提出采用速度闭环矢量控制的控制方案来提高提升机的运行精度,并采用冗余硬件来提高系统的可靠性。通过对排焦机理进行分析与研究,对排焦控制系统的滞后问题,采用了史密斯预估控制方案,排焦系统的设备运行环境得到了大大的改善,对干熄焦其它参数变量控制的影响也大大的削弱了。针对除尘器底部料位的控制通过采用料位+时间的混合控制方式,主要设备的使用寿命明显增长,降低岗位人员的劳动强度。对气体循环控制系统内的各变量参数之间的相互关系进行定性的研究,对预存段压力采用选择控制方式的设计,加强了干熄炉系统控制的稳定性;在程序设计中改变导入空气量的计算方式,导入空气量的计算更加精确,改善了系统的控制;关于循环气体流量的控制,设计为变频调速控制,既节能又能精准的控制循环气体流量;通过程序计算和外部的料位监测仪表的优化,计算出的干熄炉料位,更加的接近于真实值。通过现场的调试运行,该系统能够满足中化公司的生产需求,实现了生产过程稳定、高效、便捷和安全的目的。
[Abstract]:Our country pay more and more attention to the development of dry quenching technology, the reason is that CDQ technology has three main advantages: saving energy, protect the environment and improve the quality of coke, indispensable reason besides great social benefits and economic benefits but also vigorously develop the CDQ technology. The CDQ technology in the domestic and foreign development soon, but because many late than foreign domestic CDQ technology application, the control level is still in its infancy stage of development, it is very important to research a set of CDQ production process control system. The 3 * 140t/h CDQ project in Qian'an Coal Chemical Co., Ltd. as the research background, according to the actual situation in the process of the company's existing, mainly research the focus and difficult to control, designed to improve the performance of the control system scheme is introduced. The concept of dry quenching control system Condition and main control function. The speed regulation hoist control precision, the speed control scheme of closed-loop vector control to improve operation accuracy of machine, and the use of hardware redundancy to improve the reliability of the system. Through the analysis and Research on the mechanism of coke exhaust, coke exhaust control system lag problems, by Smith predictive control scheme, operation environment of coke exhaust system has been greatly improved, the effect of other parameters of CDQ variable control is greatly weakened. The mixed control level + time control dust remover is material through the use of the main equipment service life increase significantly, reduce the labor intensity of staff study on gas cycle control. The relationship between the variables within the system qualitatively, on stored pressure designed by the choice of control mode, and The dry quenching furnace stability control system; change the way into the air quantity calculation in the program design, calculate import air volume more accurately, improve the system control; control of circulating gas flow, the design for frequency control of motor speed, energy saving and recycling can control the gas flow through the optimization calculation precision; and the external material level monitoring instrument, calculate the dry quenching burden, more close to the true value. Through debugging operation, the system can meet the needs of the company's production, the production process is stable, efficient, convenient and safe.

【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ522.16;TP273

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