粉煤灰输送系统的研究与应用

发布时间：2018-10-08 08:21

【摘要】：气力输送系统因为具有较高的输送速度,所以会带来高能耗并且伴随着严重的磨损。如何以更加科学精确的数据指导生产,探寻科学合理的设计方法以及设计依据,实现降低输送速度、减小输送能耗、又能满足实际生产运行中的输送效率、保证系统稳定可靠运行、提升输送系统的控制性能,是目前研究气力输送系统发展的主要趋势。首先分析气力输送装置的类型和气力输送状态的类型,确定出粉煤灰气力输送装置的类型和粉煤灰气力输送状态的类型。针对目前国内粉煤灰恒流气力输送系统和单泵制输灰系统在运行工作中存在的弊端,综合实际现场对粉煤灰输送的运行要求,最终决定采用双泵式粉煤灰恒压气力输送方案。对本研究系统的主要相关参数进行计算与设定,并对其中部分结构进行优化改进。粉煤灰恒压输送可通过设定和调节输送压力来控制灰气浓度比,达到最大限度的低速输送、减小压损、降低管道和阀门磨损。在恒压调节过程中设定的恒压压力值需要与一个合适的速度相匹配。根据气固两相流的相关知识,运用ANSYS软件中FLOTRAN单元对粉煤灰气力输送的模型进行仿真分析,分析在不同速度的气流下,输灰管道中管道压力和气流流动状态的具体分布情况,优选出既科学又符合现场实际情况的输送速度。对双泵式粉煤灰恒压输送控制系统的总体方案进行详细研究,并对其核心PID控制器进行深入地研究。运用MATLAB对PID相关参数进行整定与优化,在此基础上引入模糊控制算法,构建模糊自适应PID控制器,运用MATLAB/Simulink对PID控制器进行仿真研究,为实践工作提供相关的数据和科学的理论依据。最后介绍双泵式粉煤灰恒压输送控制系统的软件设计及现场调试情况,证实应用新颖的双仓泵单元制粉煤灰恒压输送系统能够稳定可靠地连续长时间运转,不但能很好地满足现场粉煤灰的输送要求,还可以有效改善气力输送所产生的弊端。
[Abstract]:Pneumatic conveying system has high transmission speed, so it will bring high energy consumption and severe wear. How to guide production with more scientific and accurate data, explore scientific and reasonable design methods and design basis, reduce the speed of transportation, reduce energy consumption of transportation, and meet the transportation efficiency in actual production and operation. To ensure stable and reliable operation of the system and to improve the control performance of the conveying system are the main trends in the development of pneumatic conveying system. Firstly, the type of pneumatic conveying device and the type of pneumatic conveying state are analyzed, and the type of pneumatic conveying device of fly ash and the type of pneumatic conveying state of fly ash are determined. In view of the disadvantages of the domestic fly ash constant flow pneumatic conveying system and the single pump ash making and transporting system in operation at present, the double pump type constant pressure pneumatic conveying scheme of fly ash was finally adopted according to the operational requirements of the fly ash transportation in the actual field. The main parameters of the research system are calculated and set, and some of the structures are optimized and improved. The fly ash constant pressure conveying can control the ash gas concentration ratio by setting and adjusting the conveying pressure to achieve the maximum low speed transportation, reduce the pressure loss and reduce the pipeline and valve wear. The constant pressure values set during constant pressure regulation need to be matched with an appropriate velocity. According to the relevant knowledge of gas-solid two-phase flow, the model of pneumatic conveying of fly ash is simulated and analyzed by using FLOTRAN unit in ANSYS software, and the specific distribution of pressure and flow state of pipeline in ash pipeline with different velocities is analyzed. Excellent selection of both scientific and in line with the actual situation of the field delivery speed. The general scheme of double pump fly ash constant pressure conveying control system is studied in detail, and its core PID controller is studied deeply. The parameters of PID are adjusted and optimized by MATLAB, and fuzzy control algorithm is introduced to construct the fuzzy adaptive PID controller. The PID controller is simulated by MATLAB/Simulink. To provide relevant data and scientific theoretical basis for practical work. Finally, the software design and field debugging of the control system for the constant-pressure conveying of fly ash with double pump are introduced. It is proved that the system can run steadily and reliably for a long time. It can not only meet the requirement of fly ash transportation, but also improve the drawback of pneumatic conveying.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH232

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