The Development And Application Of Design Specifications Analysis Tools

Design specifications are the technical requirements that define the rules for specific design work.They typically include the overall objective,function,technical indicators,and limitations,such as product purity,equipment load,and unit consumption,which reflect the efficiency and economy of production in the chemical industry.Reasonable process parameters and operating conditions can be set by enabling the specified function of design,which can ensure the safety of the process,control product quality,improve production efficiency,and optimize design,bringing more value and profits to enterprises.In this paper,the mathematical model of the manipulate variable and the target variable of the design specification is established.According to the number of the design specification,the design specification is divided into univariate design specification and multivariable design specifications,which are solved by various algorithms.Dichotomy,Newton method,secant method,and Brent method are used to solve the univariate design specification,while the Broyden method,MBLM method,MQNM method,and NMNM method are used to solve the multivariable design specification.The approximate norm descent line search was used to realize the global algorithm.At the same time,the reset technique and projection technique were used in the calculation.The secant method is used as the default method to solve univariate design specifications,while the MBLM method has the best computational efficiency for multivariable design specifications when the initial value specified by the design is more accurate.The proposed methods optimize the solving speed and success rate of the design specification from three aspects: the initialization of the design specification,the solving algorithm,and the calculation process.A design specification analysis tool that supports the CAPE-OPEN standard was developed using the C++ programming language and applied to four practical industrial installations to test the proposed method.The test results showed that optimizing the design specification calculation nodes can improve the calculation efficiency while satisfying the accuracy requirements.The improved MBLM method had a calculation efficiency improvement of 575% compared to the MBLM method,and the calculation time was reduced by 78.55%.Using the full-process design specification initialization improved the calculation success rate from 0% to 100%,and using the distillation tower design specification initialization reduced the iteration count by up to 68.52% and the calculation time by 61.68%.Compared with the sequential calculation,the calculation time of the aromatic hydrocarbon device can be reduced by 38.09% by using nested calculation,and the calculation time of the Broyden method in the hydroforming unit can be reduced by 3.41% by optimizing the design specification calculation with tear stream.In conclusion,the development of design specification analysis tools is crucial for solving design specification problems in chemical process simulation,improving the efficiency of design,and bringing important practical application value.The design specification analysis tools use dynamic link library technology and support the CAPEOPEN standard,making them compatible,easy to maintain,and upgrade.