| Spandex is a very important product in the modern chemical fiber domain.The chemical fiber manufacture belongs to the flow industry. It is widely used inmany fields, e.g., clothes and the material of iatrical,because the production ofspandex craft is a high-tech product in chemical fiber industry. It makes the fabricsoft and comfortable and takes on the elegant style because it has the excellentflexibility and unparalleled extensions. So consumer is favor of this kind of fabric.The production of spandex is a important part of our country's chemical fiberindustry and also makes great influence of the position of our chemical fiberindustry in the world.But the production of spandex is taken up later in our countrythan foreign countries, and moreover we completely depended on foreignequipments and the advanced technological. Although achieved several timesreforms in technique and expanding to production, the yield of year still can notcatch up with the local demand. The local market is full of imported production andthe price is very expensive. The consumption of average person in our country isfar less than developed countries'.The proportion of the consumption of spandex intotal amount of various fiber is also lower than the international level, so there is avery big potential market in our country. Our country will become the importantregion of growth demanding and development of production in the future.It isnecessary that our spandex manufactory should enhance the output of spandexproduction. But, Spandex engineering is made up of refined, polymerization,filature, so it is the typical process of chemical fiber, and have the characteristics oflong production progress, many loop needed controlled, complexity of controlprecept and high requirement of reliability. The demand of technology especiallycontrol technology is strict. So it's difficult to produce the spandex.Now ourspandex manufactory shoule carry out technics precept of many kinds ofproduction in a suit of equipment with the development of market and therequirement of new production and new arts and crafts.Only in this way,can wecatch up the technical level of the advanced countries.The research work of this paper aims at the production process optimization ofthe spandex product line of the DCS control system of the Liaoyuan DehengSpandex Company.The company once introduced two Spandex production linefrom Japan. Its production equipment completely by the overseas import, so theequipment investment is expensive.From what has discussed,the matter has limitedthe company further development.The company proposed the implementationresearch project of the Spandex production equipment domestically in 2002. Aftermore than a year through the research, design, processing and debugging, the firstdomestically Spandex production line was put into operation in 2004. The yield ofthe production line is the sum of two overseas import production lines'. Thisdomestically production line with has the similar productivity the importproduction line to compare, saves the equipment to invest 230 million Yuan,reduces the construction cycle for 9 months. At present the equipment running isgood, which expands enterprise's productivity greatly.The company will further enhance the production competitive power inmarket. How to further excavates the productive potential of the Spandexproduction line, reduces the energy consumption, reduces the production cost,enhances the output, which becomes the important question which urgently needsto solve on factory.Firstly, in view of the actual distillation process, an equilibrium stage modelfor computer simulation of multicomponent distillation process is developed afterseveral modeling mathods of distillation process have been analysed. Moreover thepaper main research the distillation process of the CR solvent has very strong steamliquid phase ideal. The production also main care of the product of the tower topand bottom.A new and apllied way -Tridiagonal matrix method is used to solveprocess modes,and physical properties parameter is caculated so that the modesequations caculation can be simplified and has good accuracy.Furthermore theNormalization algorithms is improved which improves the astringency and therapidity of the model equations.This model is accurate and feasible, and steadconvergence, which make itself more suitable for industrial application. Simulationresults show that the model has good accuracy and yields estimated value whichagrees very well with plant operating records. The established process mechanismmodel has built the foundation for the next step of optimization.Secondly, the optimized algorithm is very essential to the correct solution ofthe complex mathematics optimization model, at the same time also is theimportant question of the process optimizes.This paper mainly uses theimprovement Genetic Algorithms on the basis of researching and analysing thepractical refined distillation craft and process. In view of the algorithm superiorityand the insufficiency,we research a improved Algorithms, hybrid GeneticAlgorithm, which combines the traditional Direct Optimization algorithm andGenetic Algorithm,is developed to solve process optimazation problems of thesystems of distillation columns. Simulation results show that the algorithm not onlyhas the convergence and rapidity, but also has good performance.Thirdly, Steady-state optimal operation of distillation columns is the researchfinal goal of this paper. Combine CR solvent rectification craft characteristic,opti-mization scope and decision viarable are determined.Steady-state optimizationmodel of the refined CR solvent distillation column is established by the productquality, product receiving rate and the tower are suitable the control region to takethe constraint condition,moreover it takes the economic efficiency as a goal.Hybrid Genetic Algorithm is used to solve optimization model. optimization resultsderived from three-column systems show that the newly increased profit isconsiderable if they run under the steady-state optimal operation.Finally, This paper introduced the application prospect of the industrialprocess optimizes.This paper proposed the method has proven its accuracy and the validity afterthe simulation experiment result.Through the research of this paper,we think thesetting-up of the mechanism model of rectifying tower and optimization of modelare practical and feasible, conforms to the actual requirement of thefactory.Optimization results derived from the distillation columns show that thenewly increased profit of 1,260,000 yuan RMB a year can be expected if they rununder the steady-state optimal operation. However, as a result of the time relations ,we research still at initial stage in steady-state optimal operation of large-scaleindustrial processes.I am short of in the profound chemical engineering, the chemicaltechnology knowledge and the experience,so both the deepness and the extent isinsufficient. Nevertheless,because of the abroad meaning of the optimal operationof large-scale industrial processes, we believe that the works in this paper we donecontribute to the future work.Only in this further research work,can we believe theoptimal operation of large-scale industrial processes will has suitable applicationprospect and market value. |
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