卫生纸机能耗优化及自动控制系统研究
发布时间：2018-12-25 12:27
【摘要】：随着社会的发展和人民生活水平的提高,生活用纸成为大家日常生活中必不可少的消费品。但在全球能源相对短缺、市场竞争日益激烈以及环保力度不断增强的背景下,降低生产成本、淘汰落后产能是生活用纸行业发展的必然趋势。尤其是薄利运营的中小型卫生纸企业,只有率先解决卫生纸机的能耗问题,才能提升企业的市场竞争力。本文从卫生纸机结构和生产过程的角度出发,结合纸机压榨部、干燥部的能耗产生原因及影响因素,给出压榨部和干燥部的能耗优化方向,进而得到能耗优化方案,同时设计一套基于能耗优化方案的卫生纸机自动控制系统,具体完成的工作可以总结为以下几个方面:(1)卫生纸机各分部能耗情况的分析通过对纸机结构和生产过程的分析,得到纸机各分部的能耗情况,同时总结出纸机在正常运行时流浆箱、成形部以及卷取部的能耗基本固定,而压榨部和干燥部的能耗变化范围较大,并且两者都具有能耗优化的潜质,最终确定压榨部和干燥部的能耗优化作为本课题的重点研究内容。(2)压榨部能耗的理论分析及优化通过对纸机压榨部结构和压榨脱水原理的分析,得到出压榨纸幅干度可作为压榨部的能耗指标,同时确定压榨线压力和纸机车速是压榨部能耗的主要影响因素。结合纸机实际生产测试并记录压榨脱水数据,绘制测试数据曲线图并拟合压榨线压力、纸机车速和压榨纸幅干度三者之间的函数关系,最终确定压榨线压力和纸机车速的最优取值范围,实现压榨部的能耗优化。(3)干燥部能耗的理论分析及优化以纸幅干燥过程为基础,结合纸幅干燥原理,将干燥部分为蒸汽冷凝水系统、气罩通风系统和热回收系统,进而分析各系统的能耗分布特点及影响因素。在保证纸幅自身特性、烘缸传热效率和气罩通风效率等因素稳定不变的情况下,通过控制热回收系统的排风温湿度,增强热回收装置的能量回收能力,提高热回收装置对新风的预热温度,降低新风后续加热消耗的蒸汽用量,实现干燥部的能耗优化。(4)基于能耗优化方案的纸机自动控制系统设计结合压榨部和干燥部的能耗优化方案,总结出纸机传动控制系统和DCS(Distributed Control System,DCS)控制系统的控制要求,以西门子STEP7和 WinCC7.0 为软件设计平台,西门子 S7-300PLC(Programmable Logic Controller,PLC)为硬件设计平台,工业以太网和Profibus-DP为通讯方式,完成卫生纸机自动控制系统的设计。通过上述分析可知,合理地控制纸机压榨部和干燥部的运行参数,有利于节约纸机生产过程消耗的电能和热能,实现纸机能耗优化,同时降低生产成本,提高企业市场竞争力。
[Abstract]:With the development of society and the improvement of people's living standard, living paper has become an indispensable consumer goods in our daily life. However, under the background of the relative shortage of global energy, the increasingly fierce market competition and the increasing intensity of environmental protection, reducing production costs and eliminating backward production capacity are the inevitable trends of the development of domestic paper industry. Especially for the small and medium sized toilet paper enterprises, only by taking the lead to solve the problem of energy consumption of toilet paper machines, can the enterprises enhance their market competitiveness. In this paper, from the point of view of the structure and production process of toilet paper machine, combined with the causes and influencing factors of the energy consumption of the press part and the drying part of the paper machine, the optimization direction of the energy consumption of the press part and the drying part is given, and the optimization scheme of energy consumption is obtained. At the same time, an automatic control system of toilet paper machine based on energy consumption optimization scheme is designed. The specific work can be summarized as follows: (1) the energy consumption of each part of the toilet paper machine is analyzed through the analysis of the structure and production process of the paper machine, and the energy consumption of the various parts of the paper machine is obtained. At the same time, it is concluded that the energy consumption of the flow box, the forming part and the coiling part of the paper machine is basically fixed while the energy consumption of the press part and the drying part is large, and both have the potential to optimize the energy consumption. Finally, the optimization of the energy consumption of the press part and the drying part is determined as the key research content of this subject. (2) the theoretical analysis and optimization of the energy consumption of the press part through the analysis of the structure of the press part of the paper machine and the principle of the press dehydration. It is concluded that the dryness of the paper can be used as the energy consumption index of the press, and the main factors affecting the energy consumption of the press are the press line pressure and the speed of the paper machine. Combined with the actual production test of paper machine and recording of the data of press dehydration, the curve of test data is drawn and the functional relationship among press line pressure, speed of paper machine and dryness of press paper is fitted. Finally, the optimal range of press line pressure and speed of paper machine is determined to optimize the energy consumption of press part. (3) the theoretical analysis and optimization of energy consumption of drying part is based on the process of sheet drying, combined with the principle of sheet drying. The drying part is composed of steam condensate system, air hood ventilation system and heat recovery system, and the distribution characteristics of energy consumption and influencing factors of each system are analyzed. Under the condition that the characteristics of the paper amplitude, heat transfer efficiency of the dryer and ventilation efficiency of the hood are kept stable, the energy recovery capacity of the heat recovery device is enhanced by controlling the exhaust air temperature and humidity of the heat recovery system. Raise the preheating temperature of the heat recovery unit to the fresh air, reduce the steam consumption of the fresh air after heating, (4) Design of paper machine automatic control system based on energy consumption optimization scheme combined with energy consumption optimization scheme of press part and drying part, summarize paper machine drive control system and DCS (Distributed Control System,. DCS) control system, Siemens STEP7 and WinCC7.0 as software design platform, Siemens S7-300PLC (Programmable Logic Controller,PLC as hardware design platform, industrial Ethernet and Profibus-DP as communication mode, Complete the design of automatic control system of toilet paper machine. Through the above analysis, it can be concluded that reasonably controlling the operating parameters of the press and drying section of the paper machine is conducive to saving the electric energy and heat energy consumed in the paper machine production process, realizing the optimization of the paper machine energy consumption, reducing the production cost and improving the market competitiveness of the enterprise.
【学位授予单位】：陕西科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TS736
本文编号：2391118
[Abstract]:With the development of society and the improvement of people's living standard, living paper has become an indispensable consumer goods in our daily life. However, under the background of the relative shortage of global energy, the increasingly fierce market competition and the increasing intensity of environmental protection, reducing production costs and eliminating backward production capacity are the inevitable trends of the development of domestic paper industry. Especially for the small and medium sized toilet paper enterprises, only by taking the lead to solve the problem of energy consumption of toilet paper machines, can the enterprises enhance their market competitiveness. In this paper, from the point of view of the structure and production process of toilet paper machine, combined with the causes and influencing factors of the energy consumption of the press part and the drying part of the paper machine, the optimization direction of the energy consumption of the press part and the drying part is given, and the optimization scheme of energy consumption is obtained. At the same time, an automatic control system of toilet paper machine based on energy consumption optimization scheme is designed. The specific work can be summarized as follows: (1) the energy consumption of each part of the toilet paper machine is analyzed through the analysis of the structure and production process of the paper machine, and the energy consumption of the various parts of the paper machine is obtained. At the same time, it is concluded that the energy consumption of the flow box, the forming part and the coiling part of the paper machine is basically fixed while the energy consumption of the press part and the drying part is large, and both have the potential to optimize the energy consumption. Finally, the optimization of the energy consumption of the press part and the drying part is determined as the key research content of this subject. (2) the theoretical analysis and optimization of the energy consumption of the press part through the analysis of the structure of the press part of the paper machine and the principle of the press dehydration. It is concluded that the dryness of the paper can be used as the energy consumption index of the press, and the main factors affecting the energy consumption of the press are the press line pressure and the speed of the paper machine. Combined with the actual production test of paper machine and recording of the data of press dehydration, the curve of test data is drawn and the functional relationship among press line pressure, speed of paper machine and dryness of press paper is fitted. Finally, the optimal range of press line pressure and speed of paper machine is determined to optimize the energy consumption of press part. (3) the theoretical analysis and optimization of energy consumption of drying part is based on the process of sheet drying, combined with the principle of sheet drying. The drying part is composed of steam condensate system, air hood ventilation system and heat recovery system, and the distribution characteristics of energy consumption and influencing factors of each system are analyzed. Under the condition that the characteristics of the paper amplitude, heat transfer efficiency of the dryer and ventilation efficiency of the hood are kept stable, the energy recovery capacity of the heat recovery device is enhanced by controlling the exhaust air temperature and humidity of the heat recovery system. Raise the preheating temperature of the heat recovery unit to the fresh air, reduce the steam consumption of the fresh air after heating, (4) Design of paper machine automatic control system based on energy consumption optimization scheme combined with energy consumption optimization scheme of press part and drying part, summarize paper machine drive control system and DCS (Distributed Control System,. DCS) control system, Siemens STEP7 and WinCC7.0 as software design platform, Siemens S7-300PLC (Programmable Logic Controller,PLC as hardware design platform, industrial Ethernet and Profibus-DP as communication mode, Complete the design of automatic control system of toilet paper machine. Through the above analysis, it can be concluded that reasonably controlling the operating parameters of the press and drying section of the paper machine is conducive to saving the electric energy and heat energy consumed in the paper machine production process, realizing the optimization of the paper machine energy consumption, reducing the production cost and improving the market competitiveness of the enterprise.
【学位授予单位】：陕西科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TS736
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