Research On Optimization Of Roll Kiln Combustion Exergy Loss Based On GO-NP-PSO

Ceramic roller kiln is the most important thermal equipment in the whole process of ceramic firing.The quality of ceramic blank is determined by the adjustment of technological parameters of roller kiln to the internal temperature.Improper setting of technological parameters is likely to cause damage to ceramic products.At the same time,the ceramic roller kiln is also a high energy consumption equipment,the energy consumption of the firing stage accounts for about 50% of the energy consumption of the entire production process.After enterprise research,most companies still give priority to quality assurance,and can only reluctantly give up the reduction of energy consumption,resulting in too much energy consumption.Enterprises urgently need to balance the relationship between product quality and energy consumption and implement measures of energy conservation and emission reduction.In this thesis,the energy saving and consumption reduction of roller kiln considering the quality of ceramics was taken as the research objective.Exergy equilibrium model of the firing process was established based on exergy analysis of the second law of thermodynamics,and the link exergy loss in the firing process of roller kiln was found.The mechanism model of technological parameters and ceramic quality in firing process was established.In order to reduce the biggest exergy loss in kiln,the kiln furnace should be optimized on the premise of ensuring product quality.Therefore,this thesis makes the following research work:(1)As the traditional first law of thermodynamics cannot study the internal loss relation of the system,only the quantity of the external energy of the system is studied,so exergy analysis method is adopted.Firstly,starting from the structure and technological characteristics of the roller kiln,the external input,output and internal conversion of the roller kiln are determined.Then exergy equilibrium analysis was used to establish exergy input and output exergy,effective exergy and exergy loss of each part of roll kiln.Finally,the largest exergy loss in the kiln furnace firing project exergy combustion loss was found,and the optimization goal was determined.(2)In order to solve the problem that the temperature of ceramic body in kiln cannot be measured and its quality cannot be evaluated,a one-dimensional unsteady model between technological parameters and ceramic body temperature is established.Firstly,considering that the optimization objective is the exergy loss of natural gas combustion during the operation of the kiln,the optimized physical process is positioned to the preheating and combustion sections.Then the temperature mechanism model of ceramic in firing process is established.Finally,according to the solving problem of the mechanism model of differential equation,four different methods are compared to determine the use of compact difference to discrete it,using gauss seidel iteration.(3)The parameter optimization of exergy loss model of natural gas combustion under ceramic quality constraint was studied.Firstly,the solution of the difference equation is slow,so the optimization algorithm cannot be directly used to solve the problem.The quality model of ceramics,namely the temperature difference between the kiln and the surface temperature,is obtained by fitting with the neural network.Then,it is considered that the traditional particle swarm optimization algorithm is easy to fall into local optimality and needs parameter adjustment.The algorithm is improved by adopting the non-parameter particle swarm optimization and general reverse learning.Finally,the improved algorithm is used to optimize the process parameters.(4)In order to apply the method to the actual production process,the "ceramic roller kiln simulation optimization system" was established by using the Python simulation platform.It provides the evaluation support for the enterprise operators to optimize the process parameters in the actual ceramic production.