Research And Design Of Industrial Solid Waste Thermal Cracking System

With the development of industrial production,more and more industrial solid wastes have been produced.Especially for the smaller enterprises,such industrial solid waste has been completely unbalanced in manufacture and disposal.Most of the plastic products obtained from the oil refining and processing,in the chemical industry has proved that it can be re-converted by thermal cracking technology into flammable gas in order to achieve recycling of waste resources.Most of existing plastic industrial solid waste treatment process is more complex,equipment manufacturing costs are relatively high,coupled with the current state increased emphasis on the environmental protection industry,so this paper aims to design a simple industrial solid waste thermal cracking system,This system is environmentally friendly,reusable resources can be achieved,and the cost of equipment manufacturing is relatively low,in order to meet the industrial solid waste disposal problem of many SMEs.For the design of industrial solid waste thermal cracking system,this paper has done the following work:(1)According to the analysis of the overall process flow,the composition of the thermal cracking system under study is derived,and combining the design requirements of the industrial control system,the types of the hardware devices of the control system are selected,use the selected programmable logic controller(PLC),industrial computer,sensors,communications equipment to design for the framework of industrial solid waste thermal cracking control system.(2)According to the control requirements of the feed subsystem in the thermal cracking system,a design scheme of sealed continuous feed system is proposed.Taking the existing feeding device as the reference,the mechanical structure of the equipment was reformed.Combining with the system analysis and mechanical structure,the system architecture and flow design of the feed control were completed.(3)According to the requirement of safe and energy-saving operation in thermal cracking system,a heat transfer model based on heat insulation layer of thermal cracking system heating chamber was established.By calculating and analyzing the model,the reference was provided for the selection of heat insulation material in system.According to the cracking furnace structure,The heat transfer modeling for cracking furnace was carried out.The calculation and simulation analysis of the model transfer function provided theoretical basis for the design of cracking temperature control system.(4)According to the technological requirements of the pyrolysis subsystem in the thermal cracking system,and referring to the heat transfer model of insulation layer,the mechanical structure reconstruction of pyrolysis system is completed.According to the composition of pyrolysis control system,the hardware architecture and system flow design of pyrolysis system are completed.(5)According to the key analysis of pyrolysis system,the optimal pyrolysis temperature of industrial solid waste was studied.Through the pyrolysis furnace heat transfer model,the pyrolysis furnace temperature control was changed to the heating chamber temperature control,and the pyrolysis temperature control system was designed in detail.According to the principle of self-tuning PID algorithm in design flow,the algorithm is simulated and simulated.The feasibility of this algorithm in optimizing temperature control is verified,which provides evidence for the application of actual controller in control site.