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Studies On Refinery Optimization Of Production Planning And Optimization Of Hydrogen Network

Posted on:2003-06-21Degree:MasterType:Thesis
Country:ChinaCandidate:H B LinFull Text:PDF
GTID:2156360062975824Subject:Chemical Engineering
Abstract/Summary:PDF Full Text Request
Currently, facing the drastic competition in worldwide market and challenges after joining WTO, oil refineries must optimize the purchasing of crude oils, processing and equipment operation, production scheduling, oil products blending scheduling to make full use of inside and outside resources available. To keep the competitive position, refineries must reduce costs, improve the quality of products and get a better economic performance. The optimization researches of oil refineries are the major ways to solve these problems.Based on the analysis of optimization of oil refineries in every level, since a refinery is a very complex system, a level-by-level strategy is suggested. The upper level is management level, production planning. The lower level is sub-site, say hydrogen network and utility system and production equipment. We first optimize the upper level in overall-site and find an optimal result, with which we optimize the sub-site to reduce costs and feed back the result to the upper level. Thus the best production planning can be got by times recycles. In this paper, production planning and hydrogen network optimization will be studied individually as follow.(1) Based on the analysis of methods how to workout a production plan for oil refineries, we find that the present methods deal with uncertainties in the environment by assuming they are hard. It isn't very reasonable to deal with uncertainties in this way, disaccording with facts. We propose using fuzzy linear programming to workout a production plan. We set up a fuzzy linear programming mode! of production planning of lanzhou refinery & chemical co. considering uncertainty of crude oils supplying, uncertainty of the capability and yield of equipments, uncertainty of the price of crude oils. The result is compared with the result found by PROS VI.5, verifying the advantage and realizability of fuzzy linear programming. The model can be used to workout a short-term, middle-term, long-term production plan, also it can be modified to optimize stratagem programming with more uncertainties.(2) Also, we discuss how to set up a hydrogen network super structure and a optimization model of oil refineries. The advantage of the super structure is considering suppliers, consumers, purifier, compressors, pipes and pressure constraints, and connecting allpossible links from sources to sinks. The objective of hydrogen network is the lowest cost, making full use of hydrogen resources and meeting the demands of consumers. We build the hydrogen network superstructure and the optimization model of ZRCC for example. The result is compared with the present hydrogen network, the total cost being reduced from 71748. 45 Y/hr to 60152. 48Y/hr.
Keywords/Search Tags:oil refinery, production planning, optimization, uncertainty, fuzzy linear programming, hydrogen network, super structure
PDF Full Text Request
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