VOCs Monitoring And Control Of Printing Workshop Based On T-S Fuzzy Control Observer

With the improvement of people's cultural life,the quality of printed matters are getting higher and higher.In 2016,the total revenue of the printing industry in the country was about 1.2 trillion yuan,ranking the second in the world.Among them,the printing of packaging and decoration accounted for 79%of the total revenue.However,frequent haze in Beijing and other places in recent years,the printing industry due to VOCs(Volatile Organic Compounds)emissions caused by environmental issues more and more cause for concern.In 2015,the Pilot Scheme on Charges for Pollutants Emissions from Volatile Organic Compounds jointly formulated by the National Development and Reform Commission,the Ministry of Environmental Protection and the Ministry of Finance explicitly listed the packaging and printing industries as one of the two pilot industries for the collection of VOCs sewage charges.Therefore,to solve the issue of VOCs emissions in the printing industry has not only been an environmental issue but also an urgent need for the survival and development of printing enterprises.Currently,the printing industry to solve VOCs there are three main ways:source reduction,process control and end of governance.Source reduction requires enterprises to invest heavily in new environmental protection equipment,and the end of governance is to make up for the discharge of emissions measures,process control is an important means.However,due to the complexity of the printing process,the printability of the material,the coupling between the printing characteristics and the mechanical properties of the apparatus,the entire printing process is under the influence of time-varying,nonlinear and multi-parameter interferences to realize the VOCs process control in the printing industry Is a problem to be solved.Professor Wadden,University of Illinois School of Public Health,and other scholars from 1995 began to test the VOCs diffusion mechanism of offset printing process in printing industry,but less involved in gravure printing and other printing processes.Based on Fick's law,which describes the phenomenon of gas diffusion,a VOCs diffusion process observer based on Takagi-Sugeno(T-S)fuzzy control is constructed.Through the reconfiguration of state variables,the non-linear relationship between VOCs diffusion process is linearized to monitor and control the VOCs diffusion in printing process.Firstly,according to Fick's law,the diffusion process of VOCs in the printing workshop is described.The quality balance,the mass balance of the VOCs in the printing workshop and the conservation of the mass are analyzed.The construction process of the VOCs observer in the printing workshop is proposed.Secondly,using the T-S fuzzy control theory,a mathematical model describing the diffusion process of VOCs in a printing plant is established.Thirdly,a VOCs diffusion process observer based on T-S fuzzy control was developed.The software was programmed by MATLAB to simulate the observer,and the simulation results were basically the same as the related literatures.Finally,on the basis of this,the on-site testing of VOCs in a printing company in a printing company in Beijing was carried out on site.According to the actual testing data,the observed observer was verified by the measured data.The feasibility of the observer was verified through experimental research.The results show that the validity and practicability of the proposed VOCs observer for printing shop based on T-S fuzzy control are validated by simulation and measured data experiments,and the monitoring and control of VOCs in the printing shop are realized.The process control of VOCs in printing industry Provide an effective way.