Research On Energy Efficiency Optimization Design Method And Application Of Complex Equipment Based On Multi-domain Equilibrium

Complex equipment,such as injection molding equipment,large air separation unit（ASU）,integrated gasification combined cycle（IGCC）,all achieve the preset function in operation through the fluid medium.The working pattern is with the fluid as the working medium,which determines that the complex equipment has complex structure,multiple component parameters,module coupling,and increasing integration.In order to solve the problems of frequent change of complex equipment process parameters,stable operation under multiple working conditions,and intelligent integration of multiple devices,this paper proposes energy efficiency optimization design methods for complex equipment based on multi-domain equilibrium,expands design domain and subdivides it into:process parameters,working condition of more operational domains and device integration domain,respectively,puts forward the hierarchical Orthogonal Optimization（HOO）,the Lumped Parameter Model（LPM）and Fuzzy Supervisory Control（FSPC）of multi-domain equilibrium method,and used in the injection molding Parameter Optimization,large ASU and IGCC.In chapter 1,points out the background,purpose and significance of the research,and explains the current research situation at home and abroad and the framework of this paper.In chapter 2,Hierarchy Orthogonal Optimization（HOO）method for energy efficiency optimization in process parameter domain is proposed.Complex equipment,such as injection molding equipment,involves multiple heterogeneous parameters of thermoplastic flow,and it is difficult to obtain the optimal solution of process parameters through traditional multi-objective optimization.HOO method is proposed to solve a large number of non-uniform parameter optimization problems.The advantage of HOO is that it can extract significant impact parameters from a large number of non-uniform parameters,or obtain global Pareto frontier solutions by optimizing the significant impact parameters extracted in the uncertain search space.In chapter 3,Lumped Parameter Model（LPM）method for energy efficiency optimization in multi operating region is proposed.A continuous process design method based on LPM was proposed to solve the operation stability of complex equipment under multiple operating conditions and the coupling relationship between devices.Based on the material flow and energy flow in the continuous process,piecewise lumped parameters are extracted by linear programming under variable conditions.LPM method can solve the coupling problem of thousands of technical parameters in complex equipment.In order to improve the accuracy of LPM extraction parameters,the method of"first rough,then fine"was adopted to expand the feasible region with fuzzy interval.The improved gaussian membership function is used to approximate each stable state recursively by using t-s fuzzy interval detection.Compared with traditional methods,t-s fuzzy interval detection is more suitable for stability analysis of multi-flow coupling problems.In chapter 4,Fuzzy Supervisory Predictive Control（FSPC）method for energy efficiency optimization in device integration domain is proposed.Aiming at the problem of high modulation and low responsiveness of complex equipment,the energy and exergy joint optimization method of FSPC is proposed.By considering unmeasurable and measurable disturbances in advance,robust control under complex disturbances is realized.The monitoring layer uses fuzzy rules extracted from historical big data to make accurate control decisions.This method is of great significance for energy saving near zero emission equipment with high safety and strong control robustness.In chapter 5,the proposed HOO,LPM and FSPC methods are respectively applied in the optimization of injection molding parameters,large air separation unit and integrated gasification combined cycle unit,realizing the design method of performance enhancement of complex equipment based on multi-domain equilibrium and its application research.Through the HOO method,the injection molding energy consumption of the temperature controller decreased by 41.85%and the warpage deformation decreased by 14.2%.LPM technology was used to successfully design a 100,000 large air separation unit with a design value of 6.45%lower net power consumption per unit of oxygen（k W/（Nm₃O₂））.When FSPC method was applied to Integrated Gasification Combined Cycle（IGCC）,the system overshoot was only 4.5197%,the net efficiency increased from 37.6%to 41.7%,and the exergy efficiency increased from 36.5%to 39.2%.In chapter 6,summarizes the research results and conclusions of the energy efficiency optimization design methods for complex equipment in this paper,and looks forward to further research directions in the future.